If you have enough business where you need a back-up tank, do yourself a big favor and get another tank. MIG is already a tricky process in that it likes to cold-lap and get little/no penetration without shooting yourself in the foot and using the wrong gas. Sheet metal or not, you really need to do it right. You'll hate yourself later if you ... Sheet metal Copper backing does 2 things: 1. It draws heat out of the metal you are welding (if it is in close contact like with a chill block) 2. and it also traps argon in the weld puddle area. The back side of the weld on sheet metal gets hot and molten and needs shielding gas too. Oct 11, 2012 · For most of us MIG (properly, GMAW for Gas Metal Arc Welding) is the easiest and most effective way to join thin steel sections, but, like any other good thing, it has its own lurking snags and pitfalls. If you have had, or are having, problems MIG butt welding light gage sheet steel materials, help is at hand.

Sep 17, 2012 · The reason a no gas MIG welder works so well for beginners is because you don’t have to buy a gas cylinder to start welding with it, unlike MIG welding. As I stated, a no gas MIG welder is the same thing as a flux core wire welder. Flux core refers to the type of wire that the machine uses. 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 weldi...