Argon Gas For Tig Welding Stainless Steel. Argon is the best choice for shielding gas used in TIG welding stainless steel. There comes the question if it is okay to use Argon CO 2 mix for TIG welding.
Occasionally argon and helium are mixed to provide a hotter arc in order to weld alloys of aluminum and copper. Low incursion of base metal. Nearly 90 of TIG welding applications can be done with 100 argon as the shielding gas.
Using this mix for TIG is a really bad idea since your tungsten electrode will burn out instantly.
There are risks of porosity with excessive spatters. With the aluminum foil you can just form it to make a dam and tape it to the area that needs argon shielding. With the melting process of your pure MIG argon gas welder stunted therell be no cohesiveness in your weld. Then poke a hole and stick an argon hose thru the foil.