The old 75/25 mix will weld stainless. The only problems are that this mix tends to give a "ropey weld" and greatly compromises the corrosion resistant properties as well.Mar 9, 2003
What gas do you use for MIG welding stainless steel?
Metal Thickness in. (mm) Recommended Shielding Gas
------------------------------------- ------------------ -------------------------
Stainless Steel All thicknesses 99% Argon / 1% O2
98% Argon / 2% O2
Copper, Nickel & Copper-Nickel alloys Up to 1/8 (3.2) Argon
Over 1/8 (3.2) Argon - Helium
What is 75% argon 25% CO2 used for?
A 75/25 MIG Argon and CO2 mix is the most popular gas for MIG welding sales, making up more than 90% of the gas we sell at Vern Lewis Welding Supply. CO2 is much cheaper than inert gas, and it allows the bond to penetrate very deeply into the metal when welding.Oct 30, 2020