Gas Used For Aluminum Mig Welding. When starting it is important to make sure the gas bottle is properly installed into the holder. For most other MIG welding applications especially for steel 100 percent argon gas.
If it starts slowing down you may end up with a fused tip. Pure mixtures of argonhelium are usually only used for nonferrous metals like copper and aluminum. When starting it is important to make sure the gas bottle is properly installed into the holder.
Helium the least common.
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. And on the flip side you cant use pure argon. For most other MIG welding applications especially for steel 100 percent argon gas. The active carbon dioxide just causes the tungsten to burn to a nub.