Tri Mix Welding Gas For Aluminum. No I did not need to use a helium argon mix to weld it. For most other MIG welding applications especially for steel 100 percent argon gas is.
Heliums high ionization potential promotes arc starting after the short circuit. Blends of helium with the addition of 510 of argon and 25 of carbon dioxide tri-mix can be used for welding of stainless steel. HELIUM TRI-MIX A RIDICULOUS GAS MIX CHOICE FOR SIXTY YEARS.
Since TIG welding requires 100 percent inert gas you could potentially use 100 percent argon gas for TIG welding while being able to use the same gas to MIG-weld thin aluminum less than ½ inch.
An argonHelium mix the most common being 25 helium is ideal for tig or mig welding aluminum over 14- 50 he for over 12 and 75 he for over 1 inch. There are basically two gases that are suitable for aluminum welding. Ad Find China Manufacturers Of Aluminum Welding. Mixtures of argon and helium are probably the next common and pure helium is generally only used for some specialized GTAW applications.