Step 11: Types of Welds

Picture of Types of Welds
Getting the knack of TIG welding is mostly in getting the weld pool to form, at the same time, on both pieces of metal.

The easiest type of weld is the "fillet", two metals jointed at right angles. (The one shown in this instructable).

The next is the "lap" weld, which is two metals resting flat against each other.

Trickier is the "butt" weld, where two metals touch along the edges - it is difficult to keep the electrode traveling in a straight line along the joint, and tough to keep the weld pool going well on both.

Corners require some skill, as the heat is not dissipated evenly.

You can create "cosmetic" or "strength" welds.

Cosmetic welds tend to look more even over long lengths. Create them by making a weld pool, dipping in the rod, and then moving to the next point. Use them on highly visible joints, like on bicycles.

Strength welds are a lot stronger - use them for things that aren't designed to be seen, or are designed for strength rather than beauty. Anything that needs to bear a load (e.g., a gas cannister or propane tank) will have a strength weld. These are the welds where you simply draw the weld pool along continuously, while constantly feeding rod in.

Spudmuffon2 years ago
I would not say that either of those welds are good the cosmetic weld even if that is what you are doing the puddles are too far apart the weld will break. The strength weld has so many things going on I am not sure what to talk about first off the right side of the weld there was not enough fill at the beginning. Then there was too much heat evidenced by smooth MIG looking weld.Then too much separation between puddles as well as being to cold if it looks like you can pick it with your fingernail or a piece of wire then it is too cold
ratz23 years ago
If you want to see some excellent instructional videos on TIG and other welding check out (search for) wlediingtipsandtricks on YouTube! He also has a weldingtipsandtricks.com website.
piniongear6 years ago
Going back to the beginning of this......... Huh? I did not think you could Tig weld with a mixed gas, i.e., CO2 and argon, as you would use for Mig? Helium and argon yeah, or straight argon, but not with CO2 in there? pg
 no straight argon is the choice of nearly every tig welder i know
azote is used to purge high pressure pipe welding...but mainly yeah argon is used to do everything for TIG welding...
Agreed, for the home user 100 Argon is the only way to gas tungsten arc weld, Never use an Argon/CO2 mix with a GTAW.

You can also use Helium and nitrogen, however they are both more expensive than Argon, and the average home user will not need the benefits they provide.
cool GREAT INSTRUCTABLE ¿can you made an instructable to weld steel with TIG?
If you can TIG aluminum, steel should be a piece of cake. I can do OK steel TIG welds, but aluminum is much less consistent for me. Getting the puddle to bridge two work pieces is easier with steel. The only thing that might be a bit worse with steel is warping.
magickaldan6 years ago
Practice Practice Practice. And experiment with some wrist movement, Try like a small side to side or figure eight movement. And try to keep a constant speed to keep your weld pools a constant size shape and distance.
kiyoshi6 years ago
those are pretty good welds! nice fusion at the toes and consistently convex (very slightly).