A friend expressed an interest in learning to weld. I am writing this to give an introduction to welding for people like her. It is also a place to catalog some very useful things that required quite a bit of time and reading for me to learn them.

I weld mild steel at home to make things I want and to repair things I need.I do not weld aluminum or stainless steel. I make very little artwork with my welder. I am largely self-taught. I am aware of Tim Anderson's Instructable: Cheap Welding for Punks. He included some information I will not cover. I think I have some information he did not cover.

If terms in the next paragraph are new to you, see the Definitions paragraph that follows it. The italicized words are defined there.

Most of my experience is with electric stick welders. They cost less than other welding systems, but require more practice and skill to learn well. Many of the things one must do to get a good weld with a stick welder are not much different from a similar situation using a wire feed welder (penetration, weaving, preventing sag), and I will discuss both at the same time when possible. I will mention a little about oxy-acetylene (gas) welding. But, for the beginning, occasional welder; a wire feed welder makes learning to weld much easier. MIG is generally preferred and more expensive than flux core wire feed welding. Both have their place. People who want to begin welding are often short on cash, and may well choose to begin with a stick welder before possibly moving up to a wire feed welder after a few years, so some attention will be given to stick welding. I have no experience with TIG welding and will not discuss it.


Stickwelders have this name because the coated wire welding electrode resembles a stick you might pick up from your lawn.
Wire feed welders use a continuous wire electrode on a spool. Rollers in the welder driven by a motor feed the wire at a steady rate through an electrode holder usually called a gun. Wire feed welders were invented to increase production rates by removing the need to stop and replace a burned electrode.
Penetration means the welder did not merely lay a bead of welding material over the top of a joint, but some of the parent metal melted and fused together below the weld, too.
Weaving is moving the arc from one side of the joint to the other in order to make certain the weld penetrates into both sides of the joint. A weaving pattern is also used to prevent sag when welding in an upward direction on a vertical joint. Watch some videos of people welding. When weaving, especially with a wire feed welder, it is important to "hold the corners." That is, when the arc is to one side of the joint or the other, pause for most of a second, then move across the joint and pause for about a second on that side, too. Molten weld material is drawn toward heat. "Holding the corners" insures that the corners of the weld became hot enough for the metal to flow into them and not just lay over them. The center of the bead will be beautiful when you give attention to the corners.
Sag is molten metal that flows out of the joint while welding due to the effects of gravity. This can be a problem when the weld is vertical, overhead, or horizontally along the side of a vertical surface. Avoiding excess heat, electrodes designed to harden quickly, the angle at which the arc is directed, and general manipulation of the arc are used to control the weld and counteract sag.
Oxy-acetylene welders use two tanks, one filled with oxygen and the other with acetylene. Both gases flow through hoses at controlled pressures to mix and burn with a very hot pointed flame in a torch.
MIG refers to a wire feed welder that protects the fresh weld from mixing with oxygen in the air by continuously covering the weld area with an inert gas. If oxygen comes into contact with the hot, fresh weld; the weld becomes porous and is weakened.
Flux core welders use a thin wire electrode that has a chemical powder in its center. This powder melts and flows over the weld to protect the fresh weld from oxygen. This hardened coating is called slag. After the weld cools, chip or brush it off, depending on how thick it is.
TIG welders use a torch with a sharp tungsten tip to make a pool of molten metal with an arc. The operator dabs metal from a thin wire rod into the pool. At the same time the operator increases or decreases current to the arc with a foot pedal control. TIG welding makes beautiful welds on aluminum and various special metals. It requires much skill and practice to learn.

Other terms you may see in welding literature (Do not worry about these, unless you encounter them):

SMAW - shielded metal arc welding - stick welding
FCAW - flux cored arc welding
GMAW - gas metal arc welding - MIG welding
GTAW - tungsten inert gas welding - TIG welding

(The photo is from Bing Images.)

Step 1: Educational Resources

If you buy a new welder, it will come with a thin manual that covers safety, some mechanical information about the welder, and a few basic welding procedures to get you started. The best weldors* weld almost daily. If you learned to weld, but have not welded for a while, it is a good idea to make some practice welds before you weld anything that needs to be done well.

If you buy a used welder, but no manual comes with it, you can probably download a manual for it or a manual for a machine that is sufficiently similar. There are many helps available for the person who wants to learn to weld. Some are in text (either electronic or on paper) while others are videos.

Miller has some excellent videos for learning to weld or for improving your skills. My favorite is a video on flux core wire welding that was linked in their DIY electronic newsletter for October 2010. Many of the techniques in it are similar to techniques used in stick welding. Text and photos from the video are also at the link. Just scroll down to see the text and photos. Miller's DIY newsletter and some other newsletters from Miller are available free to anyone who wishes to sign up for them. (Archival copies of the electronic newsletters are also available for viewing on-line.) Go to the Miller page linked at the beginning of this paragraph and check the links under Resources for other videos and articles. Manuals for Miller welders and basic welding guides are also available.

Lincoln has various educational materials for learning to do stick or MIG welding, some of which you can download for free. Their book: New Lessons in Arc Welding is very good and is newly updated. For other LIncoln books, go to this link. (Pull down Education Center and go to James F. Lincoln Foundation for Educational Materials.) Also, pull down Support and go to Resources for useful free literature.

Hobart also has several resources under the E-Learning tab and a forum for welders at the Weld Talk forum. (Miller also has a forum on its Resources page.) At the E-Learning tab scroll down to see examples of good and bad welds for MIG and for stick. The second photo also shows a drawn chart of a good stick welding bead compared to various problem weld beads. These photos can help you diagnose what you are doing wrongly and correct it. Photos like these are often available elsewhere, too. Some basic guides to welding can be downloaded, too.

Another good book for the beginning stick weldor is the Forney Welding Manual. It is also out of print. Some used copies are available. Among books currently available, this book is similar in scope and approach to the Lincoln book, except that it gives a dominant treatment to MIG welders.

There are numerous video tutorials on all aspects of welding at YouTube. Some are done well, others are rather poor.

*Technically, a welder is the equipment used to make welds. A weldor is the individual who uses a welder to make welds. Often "welder" is used for both.

(The second image is from Bing Images.)

Step 2: How I Started

A friend discovered I wanted to learn to weld. He had been promoted to a desk job and no longer used his oxy-acetylene equipment. He brought it to my garage and gave me a brief tutorial. He explained the safety precautions and the procedures for using a gas welder. Then he showed me how to move the torch tip back and forth in the pattern of a "U" to make a small molten area on each side of the joint. He told me to continue moving the torch in that pattern and the two molten areas would soon join to make one puddle. Continue moving along the joint with that "U" pattern to advance the puddle. Meanwhile, also hold a piece of bare steel wire welding rod in the heat near the puddle so extra metal can be added to the puddle from the rod at a moment's notice as needed. When all is going as it should adding material from the rod is like painting molten steel into the joint with a brush. He explained that gas welding is like riding a bicycle. Once you understand the basic theory you must practice until you can make it happen as it should.  At this link you can find more detail on the set up for an oxy-acetylene gas welder. As regards position, I used a backhand position, which pushes the puddle away from the weldor.

I made and repaired quite a few things while I had access to his gas welder, including a picnic table from pipe and 2 inch lumber. My welds never broke, but they were always a bit "undercut." I never quite learned to build up a ridge on my weld beads. Jacqueline Kennedy said she painted in a manner her own family could appreciate. That also described my gas welding. 

I did learn a lot about moving and controlling a puddle of molten metal, and that skill transfers very well to welding with an electric arc welder, especially a stick welder. There are many things to keep in mind simultaneously while welding even the most simple things, but in the end, it all comes down (in my opinion) to making the molten metal do what you want it to do. All of the things you try to remember really serve that one purpose. It reminds me of a friend who flew jets in the US Air Force. He said after a while the jet simply became an extension of the pilot. The pilot thought it, and the jet responded without the pilot thinking through all of the details. With practice you will be able to observe the behavior of the molten metal and respond to make it do what you want it to do without thinking through all sorts of details.

If you want to see more about how to weld with an oxy-acetylene unit, there are a number of videos at YouTube. Just search for oxy-acetylene welding.

(The photo is from Bing Images.)


Step 3: A Stick Welder

 A gas welder can cut steel, heat steel for bending as if it were a piece of soft wire, and weld or braze. A stick welder is more limited in its applications, but never needs a refill for gas bottles. Just plug in a stick welder, flip its switch, and it is ready to weld. It also remains ready to go until the next time you use it. Just keep some welding rod stored in dry, low humidity conditions and you are ready to weld at any time. If yours is a 120 volt welder, you can take it with you to a job almost anywhere, even though it may be limited in welding power. (Actually, a stick welder can cut steel. A small diameter rod is used at high amperage in a sawing motion through the steel. A bed of sand is usually placed below to catch all of the globules of molten metal.)

Welding electrodes (welding rods) have different numbers to describe them. I like 6013 electrodes. Others prefer 7018. 6011 electrodes are also widely used. Each has different characteristics which make it more suitable for certain applications and less suitable for other applications. The numbers provide details on the characteristics of each type of electrode, but those details are beyond the scope of this Instructable.

I committed a common error: I bought more than one welder. First, I bought an inexpensive 120 volt AC stick welder because it cost what I had available in funds at the time.* Later, I realized I really wanted more power to weld heavier steel. Within a couple of years I was buying a used 230 volt stick welder. Since that, I have also bought a flux core wire feed welder. The best plan is to determine what you will need, save for it, and buy only one welder. But, had I done that, I would have waited more years to buy my first welder and would have missed some benefits from having that first welder. Fortunately, there is usually someone who is looking for a good deal on a used welder you no longer use and will buy it.

*Before Dejanews disappeared from the Internet I read a post by a young woman in Arizona. She and some friends needed to repair an iron gate in a cave. They carried a 120 volt stick welder and a Honda generator into the cave and she made the repair. I decided I would buy a 120 volt stick welder if they were that useful.

(The photo is from Bing Images.)

Step 4: Ventilation, UV, and Spatter Burns

Electric welding rods produce fumes. Welding fumes are not good to breathe. Have a fan nearby. Be near an open garage door. Galvanized steel also makes fumes you do not want to breathe. Grind the zinc coating away before welding and use good ventilation.

Cover your exposed skin. Arc welding generates UV rays linked to skin cancers. Resist the temptation to peak out from under the welding helmet in order to see while striking the arc. Instead, use a piece of carbon rod. See this Instructable.

Cover up to protect from burns caused by globules of molten metal. 

(The photo is of a sunburn and is from Bing Images. It is very much like the burn that comes from welding flash.)

Step 5: Preparation Before Welding

Actual welding takes very little time. It is the getting ready to weld that takes the time. You can probably get away with welding pieces of 1/8 inch steel together without making a chamfer on the edges to be joined as you see in the graphic. Even 1/8 inch stock should be welded from both sides for penetration and strength. 

A friend brought me a bicycle rack for the bumper and trunk lid of their automobile. A 1/2 inch rod had broken off near the end of the threaded portion. She and her husband thought I would simply run a weld bead around the break. They were surprised when I made a deep "V" across the top and bottom of the joint. Then I made a root weld at the thin leading edge of each piece to join them together. See the red oval in the graphic. The root weld is often done with a thinner welding rod or more current or both to guarantee excellent penetration. I waited until the joint had cooled and chipped away the slag. Grind a little on the back side, too, to avoid any slag being trapped under a weld. Such slag inclusions would weaken the weld. I made a weld on both the top and the bottom of the root weld to keep stresses in the metal equalized. See the yellow and blue in the graphic. Clean away the slag after the welds cool and weld on both sides again. I repeated this process until the "V"s were full. Instead of a few minutes, this project took more than an hour to complete. You can see a real life example of this at this Instructable. The same Instructable is also linked in step 7 in regard to preheating.

An old adage is to weld a little and cool a lot. After welding, pounding on the welded joint with a chipping hammer reduces stresses in the weld.

There is also the matter of duty cycle. Every welder has a duty cycle. That means it will overheat and stop welding if used continuously. The duty cycle is often 20/80. That means after welding for 2 minutes (20 percent) you must let the welder cool for 8 minutes (80 percent). Often a weld can be completed in less than 2 minutes and you will need more than 8 minutes to get ready for the next weld, anyway, so it all works out.

Step 6: A Good Ground

A good ground connection is necessary to making a good weld. Ground clamps that come with welders from the factory are often barely adequate, and they usually deteriorate over time. Making a better ground can really boost the performance of any welder. See this Instructable for how I made improvements to a very common style of grounding clamp. Read the comment section, too, for some update information. 

If the finish on the parent metal is not something very special, it is possible to grind away a bare area and attach the ground clamp there. A simple way to get a good ground through heavily painted or plastic coated surfaces without grinding and unnecessarily marring them is to attach a Vise-Grip locking plier very tightly and then connect the ground clamp to the pliers rather than to the work piece.

Step 7: Preheating

See the Instructable already linked in step 5, unless you already viewed it there. It shows some welding on heavy stock well beyond the normal capability of my 125 amp. wire feed welder, yet it worked because I preheated the joints with a MAPP gas torch before welding. That gave my welder a boost and extended its capabilities. Preheating is also useful when joining two pieces of steel different in their thicknesses. Pre-heat the thicker piece to make getting a good weld easier.

Step 8: How to Stand

Sometimes you will need to weld while kneeling or crouching. Most of the time you will be standing. You want a steady hand. When possible, you may want to grasp the hand holding the gun or stinger (electrode holder) with the other hand to make yourself more steady. I do not want to fight the heavy cables when I am welding by stick. I hang the cable over something, even my arm or shoulder so there is a short, very flexible hanging loop that does not restrict the movement of my arm or hand. I use a fairly square stance with my feet separated to give me more stability. If I am near to a bench, I rest my hip against it to steady myself. Or, if it is convenient, I rest my elbow on a flat surface while welding. All of this results in more control.

Notice how the weldor in the photo rests his elbow on the work surface and braces his right hand with his left to make himself more steady. Notice also that the weldor is fully covered with a leather jacket and leather gloves.

(The photo is from Google Images.)

Step 9: Striking the Arc With a Stick Welder

We naturally jump back when sparks begin to fly and we hear electrical popping noises. One of the hardest things at first is to remain steady when the arc first strikes. This is true whether you are using a wire feed welder or a stick welder.

Striking an arc with a stick welder has been described as like striking a match. The danger is that the end of the rod sticks on the metal without making an arc. Then the machine begins to growl very unpleasantly. That happens to everyone quite a few times. Quickly jerk your wrist side to side to break the rod loose from the steel. When that happens it usually means I need to increase the amperage a bit on the welder's output. But, higher amperage can also produce too much spatter. The trick is to find the right heat (amperage) for the metal being welded and the rod being used.

In theory, you very lightly scratch the end of the rod on the steel as if it were a match. Think of the pressure you use with your fingernail to scrape a piece of lint from your sleeve. That is about the right amount of pressure when striking an arc. Then you immediately pull the rod away from the metal just a little. Adjust the length of the arc so that you hear the sizzle of bacon frying. Because the rod burns away as you weld, you will need continuously and gradually to lower the electrode holder (stinger) nearer and nearer to the metal to maintain the proper length of the arc. If you find yourself frustrated because the rod frequently sticks when you are trying to strike an arc, see this Instructable for using a carbon rod to help get the arc started. This technique is especially helpful when you have stuck a rod once or twice and the coating is beginning to come off of the end of the rod.

(The drawing is from Google Images.)

Step 10: Some General Guidelines on Heat Settings

Your welder's manual will include a chart for setting the heat (amperage) range for the thickness of the metal you are welding. If you are using a wire feed welder, this chart will also suggest a wire speed setting. You may need to make minor adjustments for the best possible weld bead. Some new welders automatically make the proper heat and wire speed settings once the operator dials in the thickness of the metal. If you are using a stick welder, the size of the rod in thousandths of an inch is about equal to a workable welding current for that rod. All of these usually have a range of current that extends from below to above these numbers. So:

3/16 inch rod = 0.187 inch = 190 amps.
5/32 inch rod = 0.155 inch = 150 amps. 
1/8 inch rod = 0.125 inch = 125 amps.
3/32 inch rod = 0.094 inch = 90 amps.
5/64 inch rod = 0.078 inch = 75 amps.
1/16 inch rod = 0.062 inch = 60 amps.

My experience indicates that your actual settings would be a little lower than these suggestions. But, it is still a neat correspondence that the rod diameter in thousandths of an inch is very near to the correct amperage setting.

(The photo is from Bing Images.)

Step 11: Do Not Move Too Fast

Hold the electrode (rod) at about a 75 degree angle to the work surface. 

What follows applies to stick, flux core, and MIG welding.

A very common error is to travel or move the arc along the length of the joint too rapidly. This results in a poor and incomplete weld. When you are moving forward along the joint at the right speed, a crescent of light, like an eighth moon will appear at the front edge of the bead near its top. See the yellow crescent in the graphic. Go too fast and you will not see the eighth moon crescent of light. With a little practice you can distinguish this crescent of light from the brilliant flash generated by the arc. Welding is not just laying down a bead of welding rod material over the joint, but it is also melting the parent metal below the surface so it fuses together, too. That is called penetration.

In order to achieve better penetration in your welds, do not butt the two pieces tightly against each other. Instead, leave a small gap between them. That allows the arc to get down between the two pieces and make for a better weld. How much gap depends on the thickness of the metal, the thickness of the rod, and the amperage setting used on the welder's output. This gap should not be too large. Good fit up is also needed. That means there are no large gaps a weld bead cannot bridge in one pass.

The best choice is never to weld "out of position." That means you always hope to weld with the joint below you on a work surface facing upward. 'Out of position" welding happens when the joint is above you, or vertical, or along the side of something like a wall. Special techniques are required for each of these to prevent "sag," which is molten metal flowing away from the joint before it can cool enough to harden. See again the link to the Miller video on flux core welding from step 1.

While you are learning, you can put practice welds into a vise and pound on them with a very large hammer to bend them sharply. You want a weld that does not break, or if it does, it breaks next to the joint in the parent metal, but not in the joint.

Step 12: The Hot Side Is the Short Side

Heat distortion is always a problem with welding. You are laying down hot, molten steel. When it cools, it contracts. One of the most difficult tasks is to weld two pieces to make a 90 degree corner and have the corner measure 90 degrees when finished. The hot side is the short side. Whatever was hot more recently will pull together the most in the end. 

See the graphic. It is an exaggerated representation of distortion that happens when attempting to weld two pieces to make a 90 degree corner. Notice the red-gold-yellow line at the joint. The weld began with the red and moved along into the gold to finish in the yellow area. (Red represents partial cooling of the weld. Yellow represents the most recent and hottest part of the weld.) The blue arrows represent the direction in which the pieces are being distorted away from the dotted lines, which represent the square corner the weldor intended.

There are several things you can do as preventive or corrective measures.

You can plan the order and the direction in which you weld the pieces together to minimize the shrinkage effect. You can tack weld the sides of a joint and check the setup before going farther. Hopefully, the tack welds will restrict the shrinkage. 

You can guess how much shrinkage there will be and open the placement of the setup, assuming you are welding from the outer part of the corner toward the inner part, so that the pieces will be positioned properly when the welds cool; but this is almost like forecasting winning numbers for the lottery. Still, make a guess on opening the joint. Take measurements. Open the joint an extra 1/16 inch over 12 inches for 1/8 inch thick angle iron 1 inch in size. Weld and measure the finished product when it has cooled. Cut the joint open and adjust the amount the joint is opened for compensation. Weld again and check.

You can clamp the pieces to something solid before welding and pound on them while cooling to relieve stresses in the hope that the pieces do not move during their cooling.

You can check the pieces after they have cooled, heat them, and bend them back to their desired position.

In general, avoid excess welding heat and avoid more passes than necessary.

Hot steel will always contract when it cools, and welding involves hot steel. Do some planning and build in a way to leave an open door for making corrections.

One other note of caution: Welding across a load bearing member creates a weakened area prone to breakage. Welds to a load bearing member should always be parallel to the length of the member.

Step 13: Cast Iron

Most of my welding involves mild steel. Occasionally I encounter something made of cast iron. Its molecular structure is quite different from steel. When welding cast iron, the weld will bind with one side of the joint, but will be very brittle at the other side, and the joint will soon separate, forming a new break. This can be puzzling and frustrating, but there are ways around the problem. The easiest is to pound moderately, but not too hard, with a hammer on both sides of the weld, and do this continuously until the weld has cooled enough that you can hold it with your hand. Another strategy is to preheat the joint before welding and then cover it with heated sand so that it cools very slowly.

Once I welded a garden rake made of cast iron. The weld had a very nice appearance, but as soon as the tines of the rake dropped onto the ground, the joint broke open at the weld. I pounded the thin piece of cast iron on both sides of the joint until it was only lukewarm. That weld held just fine and never broke under use.

I have not done larger things in cast iron, like the side of an engine block that cracked after freezing with no anti-freeze protection. I have heard about others doing that. They welded a little in one spot and then moved on several inches to another. After just a little they moved on a few inches to yet another. Eventually they welded a little more on the first bead and then the next and the next. They kept this rotation going until they had finished. The idea was to avoid heating any one spot excessively. 

(The photo is from Bing Images.)

Step 14: Helpful Accessories

A keeper restricts exposure to humidity by the electrodes or rods. Commercial keepers are available for a very reasonable price. I had some extra PVC and decided to make my own. I got some fittings and glued them to the PVC. I wanted two compartments in my keeper. I cut a piece of plastic laminate to a width equal to the inner diameter of the PVC. It is normally not visible because it is inside the PVC, but I have pulled it out to make it visible in the photo. 

I insert partially used electrodes so the burned end is near the mouth of the keeper. That way I can find them easily and use them before I start a new rod.

A carbon arc torch is a very useful accessory for a 230 volt stick welder. It allows heating steel for easy bending. See this Instructable.

I have a piece of 1 1/2 inch aluminum angle about 18 inches long. Steel does not stick to aluminum, so there is no danger I will weld something to the aluminum. It makes a handy accessory to put into my vise. I can clamp things to it before welding. See this Instructable for how I have used it for that. It is a help when welding thin materials that might burn through easily. The aluminum acts as a backing plate to absorb extra heat and to prevent blowing holes in the thin steel. Still, I must weld in short bursts with my wire feed welder, or I could still burn a hole. I can even turn it over so it is like "V" and then I can lay two pieces of rod into the "V" for welding them end-to-end while keeping them aligned. You can see an example of how I use a piece of angle for aligning and holding rods for end-to-end welding in step 12 of this Instructable

The day will come when a friend brings something to be welded by you, and the friend needs eye protection. An inexpensive extra welding mask is good to have.

Step 15: Wire Feed Welders

As said before, much of what applies to stick welding practices also applies to welding with a wire feed unit. A steady hand, the correct angle of the electrode holder (stinger or gun), the correct heat setting, the correct travel speed, etc. are all necessary in both processes.

MIG capable welders are more costly than flux core welders because they include a gauge for regulating the shielding gas flow, a tube around the gun liner for carrying the gas to the gun, and a solenoid valve to start and stop the gas flow when the arc begins and stops. There is also the cost of the gas and a steel bottle to contain it. MIG welders can be used with flux core wire, but flux core welders cannot be outfitted as MIG welders. The advantage of MIG welders is that the welds have a better appearance and better penetration. There is also less cleanup after welding. But, in windy conditions the gas that shields MIG welds can be blown away before it does its job. MIG welding requires very clean steel while flux core welders can dig through some surface impurities to make a good weld. Flux core welders can be used in windy conditions with no problems.

In stick welding attention is given to the length of the arc. With wire feed welding the amount of wire sticking out of the end of the copper welding tip at the end of the welding gun becomes important. See the manual for your welder.

Wire feed welders are much easier to use than stick welders. They do not require the same skill level and amount of practice as stick welding. Some say laying a bead with a wire feed welder is like putting down a bead of toothpaste on a countertop. Almost anyone can do that. But, it is much more difficult to see where you are welding with a wire feed welder. It is not uncommon to wander off of the joint while welding with a wire feed welder. See the next step for three solutions. 

Turn on your wire feed welder and let it run for a minute or so before beginning to weld. 

In order to be sure your weld has good penetration and is not a "cold weld" (weld material laid over the parent metal without any real bonding), look for blue discolorations in the parent metal on both the left and right sides of the weld as a sign of good penetration.

When it is time to stop welding with a stick welder, the weldor simply pulls the electrode away from the steel and the arc stops. Those who are used to stick welders need to learn to release the trigger on the gun before pulling the gun up and away from the steel. Failure to do this results in a couple of inches of wasted electrode wire sticking out of the gun. This must be trimmed before beginning to weld again. 

With my flux core welder I can sometimes begin a new weld without trimming the burned end, but there are other times when an arc will not begin without first trimming the wire to make a fresh new end.

There are some good videos on YouTube for how to do MIG welding.

(The photo is from Bing Images.)

Step 16: Staying on the Joint Line

Most often practice and more practice is advised to learn to keep the arc on the joint line.

I made a small discovery that helps me keep the arc on the joint. Debate rages whether to push or to pull the gun when welding with a wire feed welder. I generally pull it. I noticed I can look under the gun ahead of where it is welding and there is enough light from the arc that I can see a little of the unwelded joint to use as a guide for moving the gun. That works unless the sun is coming from over my shoulder. In that case the inside of the helmet is bright and I have great difficulty seeing even the arc. See the smaller of the two text boxes in the photo.

Welding helmets come with clear lenses over the tinted lenses. These become dirty and pitted, even discolored. All of those things affect visibility. Periodically clean or replace the clear lenses. I use a Lincoln auto-darkening hood I bought in 2004. Although most auto-darkening hoods use solar cells and contain lithium-ion batteries, mine uses two AAA batteries. My helmet has never failed to darken as it should, but a family member told me I need to replace my helmet because (he believes) auto helmets darken their lenses excessively after a few years. As a last effort before replacing my trusty helmet, I replaced the AAA batteries, even though the old batteries still appear to work just fine. To my surprise, new batteries cause my helmet to darken my non-adjustable lens less and I can see the weld joint fairly well when using my wire feed welder. In the future I will check my clear lenses and replace the batteries regularly. Lithium-ion batteries no longer take a full charge after about four years of use. Those whose helmets use solar cells and rechargeable batteries should look into replacing the batteries and see if that helps visibility while welding.

Flux core welders generate quite a bit of smoke that also obscures visibility. A fan, even a small fan, nearby can move the smoke away. This makes seeing where you are welding much easier.

And, some clamp down a guide for their hand to follow. This might be a piece of board about 1 inch thick. The heel of one hand can ride against it to give a straight line guide for following the seam to be welded. See the larger of the two text boxes in the photo.

Step 17: When to Replace the Wire Feed's Tip

Most often I use my wire feed welder to weld small pieces together with a spot or a tack. It is easy to point the gun at the exact spot where the weld is to be placed and then pull down the welding hood. An auto-darkening helmet is a tremendous help, and well worth the cost. In time the hole in the tip wears and exactly where the wire will strike the metal when the trigger is pulled becomes less predictable. There will be some problem, anyway, because the welding wire has a natural curve in it from being rolled on the spool. But, when you notice the wire is still less predictable as to where it will strike the metal, it is time to replace the copper tip.

The photo shows a 0.030 inch tip I have retired. I polished the end so the hole is more visible. Notice that it is no longer perfectly round. The welder worked better with a new tip and seemed to have a better arc.

Step 18: For the Ladies

This book is for women who want to express their own artistry in metal. The author uses a MIG welder and components she has found in a scrapyard or cut from stock metal items. There is nothing in it that would apply to any kind of repairs around the home and shop or to structural applications. But, if you want to do designs with metal, it is a good book for you.

Step 19: Make Your Own Stick Welder?

A wire feed welder would be too complicated to make at home, but, over the years people have published articles on how you can build your own stick arc welder. A very popular Instructable tells how to make a 120 volt AC arc welder from two microwave transformers. See also my previous Instructable for links to three sets of plans for building an electric arc welder. Here are some instructions on how to use an automobile's alternator to weld for emergency repairs. Another link there has an additional scheme for using your vehicle's alternator for welding. And, if you scroll down, that link also includes some brief instructions for linking multiple car batteries together to weld. This 1980 article from Mother Earth News tells how to make a very portable DC arc welder from an alternator, a deep cycle battery, resistors, and an old lawnmower. This unit produces about 50 amps, and will be limited in what it can weld. There was a time when I was so eager to build one of these, but I never did. Here is a video of a more refined welder built on a lawnmower frame. Despite the 50 amp. output of the Mother Earth News welder, a welder similar to the one in the last link handled 3/32 inch rod fairly well. 

A used welder can be a good buy. Watch estate sales and other auctions, as well as Craigslist for your area. I bought my 230 volt Miller Thunderbolt stick welder on eBay. The photo was muddy-looking and no one else bid on it. The very good auction price became a quite reasonable price after shipping costs were added. It has been a great welder. I bought my Hobart flux core wire feed welder as a factory refurbished unit. No one has much good to say about cheap import welders. Owners are usually soon disappointed.

(The photo is from Google Images.)

Thank you for the link to your channel. I will try to look at those in the near future. Someone said you never really learn welding, but you are always learning.
very good instructable steps for welding. http://www.qd-evergreen.com<br>
<p>i invite to group</p><p><a href="https://www.facebook.com/groups/363638020639384/?fref=ts" rel="nofollow">https://www.facebook.com/groups/363638020639384/?f...</a></p>
<p>Well written, and researched. Simple enough for the uninitiated (your audience) and brilliantly laid out. Darned glad you included plenty of eye protection, UV , and burn protection advice. Welding can be fraught with danger when done wrong.<br><br>Thanks for sharing your experience so myself and others will probably have a much better experience beginning welding than we might have had!</p>
<p>Hi, great post - thank you. I've just bought a stick welder and am trying to learn a bit about what to do before I switch it on! One silly question I've got is about inserting the stick and taking it out again. I assume you have to switch the machine off while doing this, right? It seems obvious, but it's hard to tell from some of the videos I've watched. If you touch the stick (with gloves of course) while the machine is on, is there a risk of electric shock?<br><br>Another unrelated question: my machine has a hotstart button, which lasts for about 1 second before switching back to regular &quot;current&quot; mode. I haven't figured out what this is for and how to use it. As it's only 1 second, do you press the button and then immediately start the arc? It means having the welder immediately within reach while using it, which doesn't seem feasible... ?</p><p>Thanks</p>
HOT START is a feature developed primarily for achieving good wetting at the toe and penetration when first starting a weld. This is almost exclusively intended to eliminate cold roll on highly conductive metals like aluminum. Due to the high conductivity of aluminum, roughly twice the amount of voltage is required to initiate a weld as steel - because aluminum rapidly conducts heat away from the arc, starving the puddle for heat. Hot Start is a short boost in voltage for 0.5-2.0 seconds (average range, often adjustable), which overcomes the conductivity of the metal, resulting in a wet-in and flatter start to your weld bead, rather than a taller, cold-rolled one.<br>It should be noted, that there are techniques which experienced welders employ to ensure a good weld start, without the benefit of hot start. <br>
Welcome to Instructables and thank you for your comment. I have a friend who held the coated electrode flat in the palm of his hand while he placed it into the &quot;stinger&quot; with the machine on. He said it is perfectly safe. I replace electrodes with the machine on, but hold the electrode in my gloved hand. <br><br>I am not familiar with the hot start button. I know a little extra current is sometimes needed to strike the arc without sticking the rod without sticking it. My welder does not have that feature. Once I was welding thin square tubing with 1/16 inch rod. I kept the current low to avoid burning through, but then had a difficult time starting the arc. If I increased the current for an easier arc start, there was a tendency to burn through the metal from too much current. I suspect your hot start button is designed to give you more current for starting the arc, but then quickly reducing the current to lessen the chance of burn through.<br>It is a good feeling the first time you turn on your welder and can join two pieces of metal without screws or rivets.
GMAW and GTAW processes were both originally developed for joining aluminum. Only after the production value of GMAW was realized did it become a popular alternative to SMAW.
<p>Awesome article!</p><p>Here's a question for Phil or anyone in the know. I am hoping to get into hobby welding, just small fix it jobs, perhaps give a couple of creative garden pieces a go... have a small wirefed flux welder, but have been leary to pull the &quot;trigger&quot; as it were. I have an intense fear of things that can put out that kind of electricity and yet, have read many things about safety (my wife sometimes criticizes me for over researching things to death, although here, she is on board). I am fairly confident I can practice and give this a go. Question, for small items, if I have them on a metal welding table, with the ground clamp on the table, like the picture in step 8, and I touch the table, am I susceptible to a shock myself? How does the piece become grounded and not me? Not sure if I am asking this correctly, as I have tried googling the question, but again, with the way I word the request, am not finding the information I seek!</p>
<p>Electricity follows the path of least resistance, and it wants to go to the ground connection. The grounded metal table provides a much easier path than your fairly high resistance flesh and bone. Add to that, the soles on your shoes and a concrete floor are not very good conductors. It is a little like a bird sitting on a power line, as long as the bird does not become part of the circuit, it's body can be charged with thousands of volts without injury. Wear enough clothing to protect you from spatter and from touching very hot metal, and you will be fine, </p><p>Still, a poor ground connection makes it difficult to weld well, if at all. A metal table makes getting a ground easy, but I always like a direct clamped connection to make certain there is frosting on the cake. If there is the least doubt about the quality of the ground connection, have a single conductor from something light and flexible, like even lamp cord, and have an alligator clip on each end. Use that cord to give a little added connection insurance, in case the metal is dirty or not resting firmly connected to the metal table. Yes, lamp cord is too small for a solo grounding cable, but it is enough to give a little supplemental insurance. </p><p>I weld with flux core rather than gas shielded MIG. The welds are not as pretty and there is more mess to clean up. But, flux core works in windy conditions where the shielding gas might be blown away before the weld can cool a little, and flux core wire can dig through dirt and paint better than solid wire with gas shielding. There is one caution. Flux core welders like you get at Harbor Freight usually give you alternating current at the weld. Flux core wire really needs direct current set to the proper polarity to work well. Those inexpensive welders are cheaper because they do not include the cost of rectifying diodes. See if you can find someone in a YouTube video demonstrating your welder and evaluating its performance. Also, brand name flux core wire performs better than no-name economy wire. </p>
hello<br>I cannot find anywhere on my instructible app to ask a question.<br>so I chose you.<br>how can I remove spot welds from my stainless steel kitchen colander without using a drill?<br>the colander has a/an oval pedestal base &amp; food stuffs get caught between the base &amp; colander.<br>my toothbrush works some, however, the bristles then get caught.<br>there are six spot welds..... I want the pedestal gone.<br>No drilling. thank you for your time and any suggestions.
I looked on YouTube to see what I could find. One video removed a piece of automobile sheet metal without harming the piece behind it. The guy in the video used a narrow belt sander powered by compressed air. He ground through the spot weld in the piece he no longer wanted, but without touching the metal behind he wanted to keep.<br><br>https://m.youtube.com/watch?v=hvHiJQL7_9s
<p>awesome Phil!</p><p>thanks!!</p>
Thanks. Avoid the temptation to pick up a piece of steel without tongs or gloves, It is probably hot and will burn you. Have fun and experiment. Practice, practice, practice. Prepare the work well so the welds go deep, and you will probably be fine. I probably should have taken some classes, but now there is a guy who pays me to weld some things for him. With wood you can make little ones out of big ones. With welding you can make big ones out of little ones. As soon as you can, get an auto darkening hood.
I already have it! eheh! bought two years ago and never used :(
<p>Auto-darkening helmets, even those that are solar powered, do contain batteries. In my experience, old batteries are weaker and the lens will be darker in use than it is supposed to be, making it more difficult to see properly while welding. Some helmets are made so the user can easily replace the batteries as needed. For those sealed with batteries inside there are videos and other items on the Internet that show how to open the sealed area and replace the batteries. Some add a battery holder for the more common and easily replaceable AAA or AA batteries rather than the 2025 or 2032 &quot;coin&quot; batteries.</p>
<p>I'm quite sure that my helmet only use &quot;solar&quot; power from the welding spark :-)</p>
<p>Thank You for educating new people! </p>
I am not at all advanced, myself. It is good to help those who are starting. Maybe it will be easier for them than it was the rest of us. Thank you for looking.
thank u sir<br>
Thank you for looking. In part, I share things like this so I can remember everything later when I forget something.
could you post next about to make our own circuits or design our own circuit.(only if you like)
<p>Falstad has a circuit applet anyone can use online. With it you can try various circuits to see how different components change them, and whether they work or not. The applet does not include integrated circuit chips, but regular discrete components. Go to falstad (dot) com/circuit.</p><p>The U.S. Navy has a course on electronics. A 1995 version is available for downloading on-line, and is not difficult to find. There are lots of electronics blogs and pages. Learn about basic circuits, like amplifiers. Combine them with other circuits and adapt them to see what you can do with them. </p><p>I know only a very little about electronics. </p>
thanks for your replying my question
what things are used for gas welding
<p>You need a good torch set with gauges, hose, and tanks. Many an arc welder costs less money to get started. A pair of goggles is sufficient and less costly than the nice self-darkening hoods needed for arc welding.</p>
<p>Thank you for taking the time to post this. I have been welding for about a year plus: self-taught from reading books, talking with real weldors, youtube videos and online articles like this and of course the best practice - actually welding. This is an excellent article. I really liked your heat warping diagram and the way you explained that. I knew there was a better way to approach this problem and I will implement some principles you made clear. I noticed you are in Vancouver - I'm not far, just over the Glenn Jackson Bridge in Portland. Thanks again!</p>
Ben,<br><br>Thank you for your comment. My welding education has been very much like yours. I wanted both to catalog what I had learned for my own record to consult later, and to share it with those who might find it helpful. More welding would certainly help me. But, I do not have unlimited supplies of steel for practice, nor do I have regular projects. <br><br>A few years ago we had purchased our present house not too far from where I-5 and I-205 join together again in the north end of Vancouver. I was attending meetings about four times a year at The Clarion on Airport Way. I rode my bicycle down from our house and got onto the bicycle lanes down the middle of the Glenn-Jackson Bridge. Since we actually moved to Vancouver, an encounter with skin cancer has caused me to cut back on exposure to sunlight and bicycling. <br><br>It might be fun to meet sometime.
This is welding of mild steel. Could you please comment on its quality? Thanks.
<p>I am not qualified to comment. Perhaps some others with more experience can comment more accurately.</p>
<p>Hello every one, I have a welder that gets hot and stop passing current (stop welding) after less than a minute of welding what should I do to fix it ? !!</p>
For starters, I would put an appropriate meter on the cord that pugs into the outlet and check the current draw. How does that compare with the rating on the label? If the actual current draw is considerably higher than the rated current draw, you will need to determine why. At the least something could be frayed and shorting. At the worst the transformer windings could be shorted, and that could require a replacement. Unless the problem is something simple and easy to fix, you probably need to take it to someone who repairs that make.
<p>Ok Phil, once I am home I will try and open it, and try to figure what's the problem with it, maybe as you said it's the transformer winding I think ! <br>Thanks a lot!</p>
<p>if you can check against a working copy of your welder, you can make a precise measurement of the resistance in each winding and compare the two welders. I doubt you can do much other than replace the transformer, if that is truly the problem. What type and make of welder is it?</p>
Invaluable!<br> <br> Found this via your new &quot;<a href="https://www.instructables.com/id/Never-Again-Weld-a-Crooked-Bead/" rel="nofollow">Never Weld a crooked Bead</a>&quot; instructable. Keep up the good work! And Thanks again!
<p>Thank you for your comment. I am sorry I missed it until now. If you have ever seen The Red Green Show on PBS, you know the expression, &quot;We're all in this together!&quot;</p>
In all reality limiting welds to &lt;=3in would be ideal to prevent warping
I've heard you should not put the cable over your shoulder because of the magnetic field or something. I think I read it in some other 'ible and a welding safety guide too.
its not so much emf as if your cable has a nick in the insulation and you bump up against a grounded piece of metal it will give you quite a shock. most dc welders (as far as i know, i could be wrong) don't put out that much emf.
I suppose that could be. I do not know. I probably do that five times a year and then for only a few minutes each time. I probably have more to worry about from my cell phone, which I do not use very often, either. Perhaps some others will be able to add something on this. Thank you for looking and for commenting.
I did find a<a href="http://www.millerwelds.com/resources/communities/mboard/archive/index.php/t-21949.html"> forum discussion</a> on hanging the welding cable over an arm or a shoulder. Most of the concern related to becoming tangled in the cables as a tripping hazard. There was some concern related to electromagnetic fields and heart pacemakers. There was also a concern for possible yet unknown health effects. One person posting quoted some guidelines from Lincoln that discouraged hanging cables over one's shoulder, but no explanation or reason was given.
I'm not too concerned about all the hype over long term effects of EMFs in cell phones and microwave ovens yet (the studies are mostly inconclusive or sketchy); what I read said that doing that could stop your heart. It didn't mention pacemakers specifically, so I'm not sure if your heart would be at risk without a pacemaker.
My father had a small electrical business. I was his helper during high school. The danger was always considered to be an electrical current that flowed across the chest cavity and the heart, either from one arm to the other, or from one arm to the other leg. Only a surprisingly few milliamps were needed to be fatal. But, that is much different from a nearby EMF.<br><br>While the heart beats as a result of electrical activity duplicated in a pacemaker, an EMF would, I believe, be unlikely to produce an arresting current flow across the heart. I simply do not know if a heart could be stopped by a close proximity EMF. It would seem the presence of a metal would be required. Perhaps someone reading this has more and better information.
I found <a href="http://www.magnopro-usa.com/research/Electromagnetic-Fields-and-the-Heart.pdf">this article</a> on the effects of EMFs on living tissue. It does not sound like an EMF from a welder operating on 60 Hz alternating current is likely to stop a heart, but it may produce tissue changes over time that result in heart disease. Other hits mentioned type 3 diabetes caused by EMFs.
Phil strikes yet again like a Thunderbolt from on high! Now I have to ask, you do know that you can tap start stick arcs too right? Match dragging is total rookie material. I was done with that stuff by my third bead.<br> <br> What bugs me the most when I weld is a phenomenon I like to call &quot;back lighting&quot;, where reflected light off my lens makes it more difficult for me to see while I am welding. I have an extra leather bib for my summer welding jacket that I throw over the top of my hood to cut it down.<br> <br> Although doing so does tend to make my hood fog up fast. So I should invent the hood awning and retire a multi gazillionare!<br> <br> My spark box:<br> <br> <br>
Color me a rookie. I tried the tapping method a couple of times and always stuck the rod, so I stayed with what I know. Also, this Instructable is for someone who is just beginning, so the easiest method seems OK.
I've been giving this a bit of thought lately and I have come to the conclusion that my machine just may have a bit better an arc starter in it than most welders usually have due to the fact that is a TIG/Stick welder.<br><br>The engineers at Miller looked at each other and said you know if we throw a heavy lead on this puppy it ought to stick weld OK too. The marketers smiled and nodded.<br><br>I mean sometimes all I have to do is get the rod close and I'm ignited. But this is the only machine I've ever stick welded with so are they all like that?
most stick tig combos have what is called hot start which jacks up amperage like 15 to 20% to make starting electrodes easier. regardless i still preferred my dialarc to my sycrowave for stick welding until i was given a xmt 350 that does mig tig and stick. match stike technique is the only technique i use in the shop for lighting off my electrodes

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