How to Weld - MIG Welding

This is a basic guide on how to weld using a metal inert gas (MIG) welder. MIG welding is the awesome process of using electricity to melt and join pieces of metal together. MIG welding is sometimes referred to as the "hot glue gun" of the welding world and is generally regarded as one of the easiest type of welding to learn.

**This Instructable is not intended to be THE definitive guide on MIG welding, for that you might want to seek out a a more comprehensive guide from a professional. Think of this Instructable as a guide to get you started MIG welding. Welding is a skill that needs to be developed over time, with a piece of metal in front of you and with a welding gun/torch in your hands.**

If you are interested in TIG welding, check out: How to Weld (TIG).

Step 1: Background

MIG welding was developed in the 1940's and 60 years later the general principle is still very much the same. MIG welding uses an arc of electricity to create a short circuit between a continuously fed anode (+ the wire-fed welding gun) and a cathode ( - the metal being welded).

The heat produced by the short circuit, along with a non-reactive (hence inert) gas locally melts the metal and allows them to mix together. Once the heat is removed, the metal begins to cool and solidify, and forms a new piece of fused metal.

A few years ago the full name - Metal Inert Gas (MIG) welding was changed to Gas Metal Arc Welding (GMAW) but if you call it that most people won't know what the heck your talking about - the name MIG welding has certainly stuck.

MIG welding is useful because you can use it to weld many different types of metals: carbon steel, stainless steel, aluminum, magnesium, copper, nickel, silicon bronze and other alloys.

Here are some advantages to MIG welding:

• The ability to join a wide range of metals and thicknesses
• All-position welding capability
• A good weld bead
• A minimum of weld splatter
• Easy to learn

Here are some disadvantages of MIG welding:

• MIG welding can only be used on thin to medium thick metals
• The use of an inert gas makes this type of welding less portable than arc welding which requires no external source of shielding gas
• Produces a somewhat sloppier and less controlled weld as compared to TIG (Tungsten Inert Gas Welding)

Step 2: How the Machine Works

A MIG welder has a couple of different parts. If you open one up you will be able to see something that looks like what is pictured below.

The Welder

Inside the welder you will find a spool of wire and a series of rollers that pushes the wire out to the welding gun. There isn't much going on inside this part of the welder, so it's worth it to take just a minute and familiarize yourself with the different parts. If the wire feed jams up for any reason (this does happen from time to time) you will want to check this part of the machine out.

The large spool of wire should be held on with a tension nut. The nut should be tight enough to keep the spool from unraveling, but not so tight that the rollers can't pull the wire from the spool.

If you follow the wire from the spool you can see that it goes into a set of rollers that pull the wire off of the big roll. This welder is set up to weld aluminum, so it has aluminum wire loaded into it. The MIG welding I am going to describe in this instructable is for steel which uses a copper colored wire.

The Gas Tank

Assuming you are using a shielding gas with your MIG welder there will be a tank of gas behind the MIG. The tank is either 100% Argon or a mixture of CO2 and Argon. This gas shields the weld as it forms. Without the gas your welds will look brown, splattered and just generally not very nice. Open the main valve of the tank and make sure that there is some gas in the tank. Your gauges should be reading between 0 and 2500 PSI in the tank and the regulator should be set between 15 and 25 PSI depending on how you like to set things up and the type of welding gun you are using.

**It's a good rule of thumb to open all valves to all gas tanks in a shop only a half turn or so. Opening the valve all the way doesn't improve your flow any more than just cracking the valve open since the tank is under so much pressure. The logic behind this is so that if someone needs to quickly shut off gas in an emergency they don't have to spend time cranking down a fully open valve. This might not seem like such a big deal with Argon or CO2, but when your working with flammable gases like oxygen or acetylene you can see why it might come in handy in the event of an emergency.**

Once the wire passes through the rollers it is sent down a set of hoses which lead to the welding gun. The hoses carry the charged electrode and the argon gas.

The Welding Gun

The welding gun is the business end of things. It's where most of your attention will be directed during the welding process. The gun consists of a trigger that controls the wire feed and the flow of electricity. The wire is guided by a replaceable copper tip that is made for each specific welder. Tips vary in size to fit whatever diameter wire you happen to be welding with. Most likely this part of the welder will already be set up for you. The outside of the tip of gun is covered by a ceramic or metal cup which protects the electrode and directs the flow of gas out the tip of the gun. You can see the small piece of wire sticking out of the tip of the welding gun in the pictures below.

The Ground Clamp

The ground clamp is the cathode (-) in the circuit and completes the circuit between the welder, the welding gun and the project. It should either be clipped directly to the piece of metal being welding or onto a metal welding table like the one pictured below (we have two welders hence two clamps, you only need one clamp from the welder attached to your piece to weld).

The clip must be making good contact with the piece being welded for it to work so be sure to grind off any rust or paint that may be preventing it from making a connection with your work.

Step 3: Safety Gear

MIG welding can be a pretty safe thing to do so long as you follow a few important safety precautions. Because of MIG welding produces lots of heat and lots of harmful light, you need to take a few steps to protect yourself.

Safety Steps:

• The light that is generated by any form of arc welding is extremely bright. It will burn your eyes and your skin just like the sun will if you don't protect yourself. The first thing you will need to weld is a welding mask. I am wearing an auto-darkening welding mask below. They are really helpful if you are going to do a bunch of welding and make a great investment if you think you will be working with metal often. Manual masks require you to jerk your head dropping the mask into position or require to use a free hand to pull the mask down. This allows you to use both your hands to weld, and not worry about the mask. Think of protecting others from the light as well and use a welding screen if it's available to make a border around yourself. The light has a tendency to draw on lookers who might need to shielded from being burned too.
• Wear gloves and leathers to protect yourself from molten metal splattering off of your work piece. Some people like thin gloves for welding so you can have a lot of control. In TIG welding this is especially true, however for MIG welding you can wear whatever gloves you feel comfortable with. The leathers will not only protect your skin from the heat produced by welding but they will also protect your skin from the UV light produced by welding. If you are going to be doing any amount of welding more than just a minute or two you will want to cover up because UV burns happen fast!
• If you are not going to wear leathers at least make sure that you are wearing clothing made from cotton. Plastic fibers like polyester and rayon will melt when they come into contact with molten metal and will burn you. Cotton will get a hole in it, but at least it won't burn and make hot metal goop.
• Do not wear open toed shoes or synthetic shoes that have mesh over the top of your toes. Hot metal often falls straight down and I have burned many holes through the tops of my shoes. Molten metal + hot plastic goo from shoes = no fun. Wear leather shoes or boots if you have them or cover your shoes in something non-flammable to stop this.


• Weld in a well ventilated area. Welding produces hazardous fumes which you shouldn't breathe in if you can avoid it. Wear either a mask, or a respirator if you are going to be welding for a prolonged amount of time.

Important Safety Warning

DO NOT WELD GALVANIZED STEEL. Galvanized steel contains a zinc coating that produces carcinogenic and poisonous gas when it is burned. Exposure to the stuff can result in heavy metal poisoning (welding shivers) - flu like symptoms that can persist for a few days, but that can also cause permanent damage. This is not a joke. I have welded galvanized steel out of ignorance and immediately felt it's effects, so don't do it!

Fire Fire Fire

Molten metal can spit several feet from a weld. Grinding sparks are even worse. Any sawdust, paper or plastic bags in the area can smolder and catch fire, so keep a tidy area for welding. Your attention will be focused on welding and it can be hard to see what's going on around you if something catches fire. Reduce the chance of that happening by clearing away all flammable objects from your weld area.

Keep a fire extinguisher beside the exit door from your workshop. CO2 is the best type for welding. Water extinguishers are not a good idea in a welding shop since you are standing next to a whole lot of electricity.

Step 4: Prep for Your Weld

Before you start welding make sure things are properly setup at both the welder and on the piece you are about to weld.

The Welder

Check to make sure that the valve to the shielding gas is open and that you have around 20ft^{3/hr flowing through the regulator. The welder needs to be on, the grounding clamp attached to your welding table or to the piece of metal directly and you need to have proper wire speed and power setting dialed in (more on that later).}

The Metal

While you can pretty much just take a MIG welder, squeeze the trigger and and touch it to your work piece to weld you won't get a great result. If you want the weld to be strong and clean, taking 5 minutes to clean your metal and grind down any edges that are being joined will really help your weld.

In the picture below randofo is using an angle grinder to bevel the edges of some square tube before it gets welded onto another piece of square tubing. By creating two bevels on the joining edges it makes a little valley for the weld pool to form in. Doing this for butt welds (when two things are pushed together and joined) is a good idea.

Step 5: Laying a Bead

Once your welder is set up and you have prepped your piece of metal it's time to start focusing on the actual welding.

If it's your first time welding you might want to practice just running a bead before actually welding two pieces of metal together. You can do this by taking a piece of scrap metal and making a weld in a straight line on its surface.

Do this a couple of times before you start actually welding so that you can get a feel for the process and figure out what wire speed and power settings you will want to use.

Every welder is different so you will have to figure these settings out yourself. Too little power and you will have a splattered weld that won't penetrate through your work piece. Too much power and you might melt right through the metal entirely.

The pictures below show a few different beads being laid down on some 1/4" plate. Some have too much power and some could use a little more. Check out the image notes for the details.

The basic process of laying a bead is not too difficult. You are trying to make a small zig zag with the tip of the welder, or little concentric circles moving your way from the top of the weld downward. I like to think of it as "sewing" motion where I use the tip of the welding gun to weave the two pieces of metal together.

First start laying beads about an inch or two long. If you make any one weld too long your work piece will heat up in that area and could become warped or compromised, so it's best to do a little welding in one spot, move to another, and then come back to finish up what's left in between.

What are the right settings?

If you are experiencing holes in your workpiece than your power is turned up too high and you are melting through your welds.

If your welds are forming in spurts your wire speed or power settings are too low. The gun is feeding a bunch of wire out of the tip, it's then making contact, and then melting and splattering without forming a proper weld.

You'll know when you have settings right because your welds will start looking nice and smooth. You can also tell a fair amount about the quality of the weld by the way it sounds. You want to hear continuous sparking, almost like a bumble bee on steroids.

Step 6: Welding Metal Together

Once you've got your method tested out a bit on some scrap, it's time to do the actual weld. In this photo I am doing just a simple butt weld on some square stock. We've already ground down the edges of the surfaces that are going to be welded so that the seem where they meet makes a small "v".

We are basically just taking the welder and making our sewing motion across the top of the seem. It's ideal to weld from the bottom of the stock up to the top, pushing the weld forward with the tip of the gun, however that isn't always comfortable or a good way to start learning. In the beginning it's perfectly fine to weld in whatever direction/position that is comfortable and that works for you.

Once we finished welding the pipe we were left with a big bump where the filler came in. You can leave that if you like, or you can grind it flat depending on what you are using the metal for. Once we ground it down we found once side where the weld didn't penetrate properly. (See photo 3.) That means that we need to have more power and more wire to fill in the weld. We went back and redid the weld so that it was properly joined.

Step 7: Grind down the weld

If your weld isn't on a piece of metal that will show, or if you don't care about how the weld looks, then you are done with your weld. However, if the weld is showing or you are welding something that you want to look nice then you will most likely want to grind down your weld and smooth it out.

Slap a grinding wheel onto an angle grinder and get started grinding on the weld. The neater your weld was the less grinding you will have to do, and after you have spent a whole day grinding, you will see why it's worth it to keep your welds neat in the first place. If you use a ton of wire and made a mess of things it's ok, it just means that you might be grinding for a while. If you had a neat simple weld though, then it shouldn't take too long to clean things up.

Be careful as you approach the surface of the original stock. You don't want to grind through your nice new weld or gouge out a piece of the metal. Move the angle grinder around like you would a sander so as not to heat up, or grind away any one spot of the metal too much. If you see the metal get a blue tinge to it you are either pushing too hard with the grinder or not moving the grinding wheel around enough. This is can happen especially easily while grinding thing sheets of metal.

Grinding welds can take a while to do depending on how much you have welded and can be a tedious process - take breaks while grinding and stay hydrated. (Grinding rooms in shops or studios tend to heat up, especially if you are wearing leathers). Wear a full face mask when grinding, a mask or respirator, and ear protection. Make sure that all your clothing is neatly tucked in and that you don't have anything hanging down from your body that could get caught in the grinder - it spins fast and it can suck you in!

When you are done your piece of metal might look something like the one in the second photo pictured below. (Or maybe better as this was done by a few Instructables Interns at the beginning of the summer during their first welding experience.)

Step 8: Common Problems

It can take a good amount of practice to start welding reliably every time, so don't worry if you have some problems when you first stop. Some common problems are:

• No or not enough shielding gas from the gun is surrounding the weld. You can tell when this happens because the weld will start splattering little balls of metal, and will turn nasty colors of brown and green. Turn up the pressure on the gas and see if that helps.
• Weld is not penetrating. This is easy to tell as your weld will be weak and won't be fully joining your two piece of metal.
• Weld burns a while right through your material. This is caused by welding with too much power. Simply turn down your voltage and it should go away.
• Too much metal in your weld pool or the weld is globy like oatmeal. This is caused by too much wire coming out of the gun and can be fixed by slowing down your wire speed.
• Welding gun spits and does not maintain a constant weld. This could be caused because the gun is too far from the weld. You want to hold the tip of the gun about 1/4" to 1/2" away from the weld.

Step 9: Wire Fuses to Tip/Change the Tip

Sometimes if you are welding too close to your material or you are building up too much heat the tip of the wire can actually weld itself onto the tip of your welding gun. This looks like a little blob of metal at the tip of your gun and you'll know when you have this problem because the wire won't come out of the gun anymore. Fixing this is pretty simple if you just pull on the blob with a set of pliers. See photos 1 and 2 for visuals.

If you really scorch the tip of your gun and fuse the hole closed with metal then you need to turn the welder off and replace the tip. Follow the steps and the overly detailed photo series below to see how it's done. (It's digital so I tend to take too many pictures).

1. (Photo 3) - The tip is fused closed.

2. (Photo 4) - Unscrew the welding shield cup.

3. (Photo 5) - Unscrew the bad welding tip.

4. (Photo 6) - Slide a new tip into place.

5. (Photo 7) - Screw the new tip on.

6. (Photo 8) - Replace the welding cup.

7. (Photo 9) - It's now good as new.

Step 10: Replace Wire Feed to Gun

Sometimes the wire gets kinked and won't advance through the hose or the gun even when the tip is clear and open. Take a look inside of your welder. Check out the spool and the rollers as sometimes the wire can become kinked in there and need to be re-fed through the hose and the gun before it will work again. If this is the case, follow these steps:

1. (Photo 1) - Unplug the unit.

2. (Photo 2) - Find the kink or jam in the spool.

3. (Photo 3) - Cut the wire with a set of pliers or wire cutters.

4. (Photo 4) - Take the pliers and pull out all of the wire from the hose through the tip of the gun.

5. (Photo 5) - Keep pulling, it's long.

6. (Photo 6) - Unkink the wire and feed it back into the rollers. To do this on some machines you have to release the tension spring holding the rollers down tight on the wires. The tension bolt is pictured below. It's the spring with the wing nut on it in it's horizontal position (disengaged).

7. (Photo 7) - Check to make sure the wire is properly seated between the rollers.

8. (Photo 8) - Re-seat the tension bolt.

9. (Photo 9) - Turn on the machine and depress the trigger. Hold it down for a while until the wire comes out of the tip of the gun. This can take 30 seconds or so if your hoses are long.

Step 11: Other resources

Some of the information in this Instructable was taken from an online Mig Welding Tutorial from the UK. A bunch more of the info was gathered from my personal experience and from an Instructables Intern welding workshop that we held at the beginning of the summer.

For further welding resources you could consider buying a book about welding, reading a knowledge article from Lincoln Electric, checking out the Miller MIG Tutorial or, downloading this beefy MIG Welding PDF.

I am sure that the Instructables community can come up with some other great welding resources so just add them as comments and I will amend this list as necessary.

Check out the other how to weld instructable by stasterisk to learn about MIG welding's big brother - TIG welding.

Happy welding!

Comments

[ncblu]

i weld for a living. folks before you spend large amounts of money on a welder, make sure you are willing to spend the time practicing, thats the most important thing, practice, practice, practice. start running straight passes, no weaving or sewing or circling. when running a bead remember - where you point the tip is where the weld will be. if you're using gas, watch for porosity because you pulled the tip back too far and contaminated the weld. dont grind your welds - it's a bad habit, even if your welds arent pretty, they will be in time. speed is very important, constant steady speed. the welders you buy at harbor freight or walmart are fine for tack welding, but i wouldnt put it to use on a trailer or something that could have bad results if a weld cracks. if you run without gas you will get lots of spatter, even with anti spatter dip. prep is the most important, make sure your metal is clean and bevels should be between 25% and 50%. when making t-welds or perpendicular welds remember the metal will contract TOWARD the weld bead, not away from it ( i know this is contrary to popular belief and highschool science but it will happen ). never weld in a down direction, never drag the bead like you would in stick welding, always be pushing the puddle in the direction you want to go. most of all practice, practice, practice

[Spudmuffon]

I agree on all points except for the grinding of the welds in my line of work (chassis fabrication) grinding the welds to make a flat billet style appearance is mandatory as long as the weld was properly prepped and is not over finished there will be no ill effects.

[headache2000]

Thanks for that "pushing" the weld info  I've been trying  to drag the weld. Not working very well either.  Probably not my only problem however. As I mentioned before all I've ever done is stick welding.

[Beausejour]

HI There Can you tell me how close i should hold the tip from my work.

[brandon_a_boyer]

For solid wire you want the wire to stick out about 1/4 to 1/2 inch, for flux cored wire you want a 1 inch stickout.

[ironandwine]

So what brand of mig welder would you recommend looking at? I'm a carpenter but my next job has a good amount of steel involved.

[stallsworth]

miller

[ncblu]

2nd that - they're worth every bit you pay for them

[ncblu]

its kind of hard to tell you exactly what type. I use miller welders at work because they are industrial grade and allow for mig/tig/stickwelding in one unit. they use gas shielding and are 3 phase units. the best way to decide is to try this link at miller http://www.millerwelds.com/ under the product menu, you'll see smart select, they ask you a bunch of questions to help you decide. once you found the type and specifics that will give you an idea if you want to try another brand. it all depends on the type of metal your welding, the size of metal, available supply voltage, will you want to use gas or gasless and the size wire you want 0.16 or 0.32 is best. the units at walmart and home depot are ok and they can be used in either gas or gasless mode but using gas shielding is always better, if you go gasless you will use flux-core wire and it doesn't work very well on thicker metal and it spatters alot. hobart makes a pretty decent portable welder but they're pricey. lincoln makes good welders also. as for helmets, what do you want, automatic or standard. i would go to a welding shop for a helmet, the ones at the hardware stores that you can get for 99 bucks are only going to give you sore eyes after a little while, they just aren't that good. i use both kinds, automatic for short welding and my standard helmet if I'm gonna be running passes for the next few hours continuously ( stay away from gold plated lenses in your manual helmet, if the gold gets scratched the UV will pas right through and burn your retina's) get a good pair of gloves that aren't tight on your fingers. while you're at it pick up a good chipping hammer and wire brush from a weld shop- the ones at the hardware store wont last and grab a container of nozzle dip, some spare tips an extra spool of wire and a pair of welpers ( pliers) i know it sounds like alot but it really helps make the welding go smoother and makes for cleaner better welds in the end

hope this helps

[ncblu]

one more thing, if you want to make a living as a welder, do not weave or circle or sew - you likely wont make it through to morning coffee break. also be prepared to weld out-of-position, this is welding on any surface that isnt sitting flat on a table ( which actually is harder to do properly than it sounds ). you might be welding upside down with hot metal dropping in your shirt.

[Spudmuffon]

Check and adjust tension you should be able to squeeze the wire and prevent it from moving while not causing any kind of bird nesting by the drive rollers

[Spudmuffon]

Except for all the splatter on the nozzle clean that up I would rather knock it out with a round file but a screw driver, small pry bar, scribe, pliers will work.

[Spudmuffon]

When grinding run parallel to the work not side to side save that for corner sanding with a 9in. Take the welds down to about 3/32 or so and have at it with the 9 in sander you will have much nicer results

[Spudmuffon]

Honestly leathers are overrated if you are going to be welding day in day out 10-12 hours a day then yes they are wonderful the average person no long sleeves made from a non melting cloth will suffice

[jjjwat]

my question is just about the wire.....canu use meg wire for jewlery making safely?

[mtudge]

MIG welding is one of the most popular forms of welding used along with TIG welding, and it is personally one of my favourite welding methods. Thanks for sharing this article and BTW a great welding company is - http://www.mrkservices.co.uk/

[wild_child]

I've welded or a few years now. I use to weld on mild steel and now i weld aluminum. (Sorry for any miss spells.) One thing learned is each welder is different and sometimes you need to try different welding styles.

[ccarrico]

This is a good article to how to use a MIG and I think that you covered the points well, however I think that perhaps a better picture would be better for this article. Even thought you are wearing gloves while MIG-ing I know from experience that you must wear a jacket or a long sleeved shirt to protect your arms from the ultra violet light. Even from say 30 seconds of MIG-ing without anything covering your arms you can get badly burned like a sunburn.

[tenfingers]

I am aware that the guard on a grinder sometimes gets in the way, but not enough to leave it off all the time!
Work safe, use the guards that the tools come with.  If they weren't necessary the manufacturer wouldn't have put them on.
If it's in the way take it off, but replace it when that part of the job is done.
Grinders are made to remove hard metal by abrasion. Imagine how well they will work on soft flesh!

[Jeffrey G C]

and it goes without saying, when you shut the grinder off, stop the disc, using either the piece that you just finished grinding, or the metal table it doesnt matter what, make sure it is not moving

i only bring this up because i just finished taking a formal MIG welding class, and another student tried handing me a grinder, abrasive disc first, while it was still spinning,
after telling him to stop the wheel and to never do that again, he tried to tell me that i was ok, because i was wearing leather gloves and a leather sleeve over my welding jacket,

bottom line: pay attention and be safe, and as toyotero said use your brain, especially when others dont

[toyotero]

This is a great instructable on the mechanics of welding.  Good work. 

I must say that I believe that every "intro to welding" written should cover more safety that was included in this one.

For example, readers should know that using a grinder without a guard involves some risk.  I've done it to get into an area where the guard hindered me, but I was very careful when I did it and I replaced the guard immediately afterward. 
Guards are your awkward friend that can save you from serious injury.

Most angle grinder injuries come from people getting metal particles in their eyes because they didn't wear proper safety gear.  On occasion, the grinding/cutting wheel can snag and kick up or back toward your body... or more explosively the wheel can break while spinning 10,000 RPM and send pieces fly with substantial inertia similar to a grenade's shrapnel.  The grinding wheel or it's pieces can go through thick clothing.  The grinder guards can stop these particles and pieces from flying at your body or prevent contact between the wheel and your body, but not if the guard is sitting on the shelf.

Here are a few documented grinder injuries on a medical website.
http://www.head-face-med.com/content/4/1/1

One other hazard that must be mentioned in regards to welding are due to the materials involved such as metals, metal coatings and solutions that might be used to clean the metal to prep for welding.  Everyone who owns a welder should familiarize themselves with these dangers. 

For example, common brake cleaner might be used to clean oil or grease off of metal before welding.  But if a drop is left on the metal, welding near it will turn it into phosgene gas which is a gas that was used to kill soldiers in WWI trenches.

http://www.brewracingframes.com/id75.htm

http://www.osha.gov/doc/outreachtraining/htmlfiles/weldhlth.html

I don't mean to try to scare anyone with these stories, I just want all my instructables associates to be aware of how to do it safely by identifying the dangers.  Welding can be done with complete safety and is a very fun and rewarding hobby if proper precautions are taken.

Have fun and be safe. Use your tool guards, use sufficient ventilation and always use your brain.  It is the most powerful tool we have to create new things and to keep ourselves safe.

Toyotero.

[NerdMaster]

I don't think you're scaring anyone. This is all common sense stuff that people choose to ignore. It's our God-given right to be unsafe in our garages. If you ever saw me weld, you would have a cardiac infarction on the spot.

[The Dark Ninja]

Thanks buddy, now I cant un-see those guys' faces.... HOWEVER, I am going to buy a faceshield here very soon and make sure my grinder has it's guard still on it. (A friends grinder actually, but still..)

[wayne_carlot]

You just scared the sh$t out of the learners.
Don't you have anything to do.
Breath some of that gas....breath deeply.

The rest of you, use standard safety procedures, You'll be OK.

Have welded for a long time, in big sheds, in the middle of nowhere, under water....etc  etc,

This is a good course, read it and "Ask lots of questions",

I don't think the bloke who's running it will care, Lots of fresh content gives you good google ratings...enjoy..:-)

[nail face]

 man youre gonna give me nightmares

[louis85]

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Louis
Taizhou Genteck Electric Co.,Ltd.
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Office Phone:[phone]
Fax Number:[phone]
Email:[e-mail]
Online service: MSN: [e-mail]
Website:www.sparkwelding.com,http://genteck.en.alibaba.com/

[Mathias Re'eh]

Bahahaha you spelled battery, machine, contact, and machines wrong :D Lol Fail

[msw100]

Sort you English grammar out before laughing at anyone else friend,as you are make a fool of yourself !!

[brandon_a_boyer]

Yeah, don't buy their stuff.

They don't even have the proper data for their equipment on the website, all they are are cheap Chinese Knock-offs of ESAB equipment.

[jone-gc]

Most Chinese factories don't have a data base for the website, many of them even don't have a website, they only produce the cheap machine.And the reason the machines are cheap: lower costs of blue-collar workers, no extral cost for any other "useless and expensive " workes ( an IT crew for instance) at all

[brandon_a_boyer]

Calling a worker who makes vital information easily available to prospective customers "useless and expensive" is pretty short-sighted.

There are a whole range of factors that effect the price for this equipment. We could debate that concept all day. The fact remains that this equipment will be of lesser quality.

[jone-gc]

No, we don't have to debate, yes, many of them are lesser quality.
However, the difference between the quality is much more smaller than the difference between prices,that is why there are still so many people buying them.
Your are absolutely right about the "short-sighted" too, many factories are used to do the domestic trade, by which they can take the customers directly to the factory, to see the equipments,to get all information in need, they don't have the foresight of international trade, but the profit of international trade is so enticing that they still make the way to do it.
If you have the chance to come to China and see the factories, you will understand all I am saying.

[brandon_a_boyer]

You're just looking at the initial cost difference. Not the added costs in the long run. You can't sue a company in China if the welder ends up breaking after two days, or worse hurts someone.

Honestly I have no desire to go to China. Not until the country cleans up it's act on an industrial level.

[jone-gc]

When I said "lesser quality",it definitely doesn't mean that bad, the quality you were saying is back to the 80's ,that is a long time ago. The truth may hurt your heart a little bit: many parts are produced here in China, only reassembled to an unit then marked as "made in ***"
The factories don't have the foresight to do the international trade, and you ,sir, don't have enough experiences to judge.Bias blinds people.

[brandon_a_boyer]

You know what also blinds people? Industrial Grade Glycerine being marketed as Medical Grade Glycerine That was in 2007. I have no problem being biased, China as a country has done nothing to remove that bias.

[welder.net.au]

MIG welding is useful because it can be used to weld many different types of metals like carbon steel, stainless steel, aluminum, magnesium, copper, nickel, silicon bronze and other alloys. Great post you have made. Thanks for sharing interesting stuff.

[BornOnFire]

In regards to Gas Tank Regulator Valves, An oxygen setup should always be opened completely so as to seat the stem of the valve against the packing. Failure to seat the internal stem's packing will likely cause a leak-resulting in a potential large scale explosion. The potential of a leak is more common than one would think. Imagine your garden spigot that you water your pansies with. Open it all the way and it usually works fine. Turn it a just few times and, usually, it drips-not a big deal. It's just a little water right? Apply this situation to your stuffy garage. You are welding a few things and the phone rings. 30 minutes later, your garage is a blasting cap just waiting for ignition. You get back to your work, strike an arc, and all of a sudden, you see a white light and your late grandmother welcomes you "Home" into God's kingdom. Now, we all would like to see Grandma again but I'm sure she can wait a few more eternities before you show up. Now, I'm not saying all regulator setups will blow you into grandma's arms again, but the Oxy-Acetylene setups are potential fatalities- now you know.

[Lorax98]

The "shield" gas is exactly that, a shield. It prevents gas molecules from the atmosphere from reacting with your molten metal. The term MIG stands for Metal Inert Gas; Inert- as in nonreactive. It is actually the Carbon Dioxide in the atmosphere that is the real problem.

[brandon_a_boyer]

Sorry, Incorrect, it's the oxygen that is the real problem, CO2 is commonly used as a shielding gas.

[amoroso82]

I recently found the need to get a MIG welder to do some repairs around here, since I have never used this meathod of welding before I got a book and began to read up on this. Now I saw this article in Instructables that has raised some questions.
 I purchaced an 120 amp welder from Harbor freight as I am not going to use this machine to do structural welding I got their middle one. ( there is one cheaper and one more expensive) I guess since I was buying crap I didnt want cheap crap.  Any way they said that there is no need to use an external source of inert gas even though the machine is set up for it, I was told that I could use wire that has flux or some material that produced inert Gas while you are welding. Is that an inferior way to weld?and do I need to get this bottle?
 The reason I asked this is because I have read almost through this whole article and the writer has only mentioned the flux core wire once. I got this thing because it was less expensive than a buzz box and I can weld thin metals easier but if I have to shell out more spondulix for gas bottles and gauges the price can go up dramaticly.
                                            Michael.