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100 % argon gas is usually the gas of choice but mixtures like 50/50 argon/helium can be helpful for welding thick sections.Make sure the polarity is connected properly. mig welding aluminum requires reverse polarity. Another way of saying reverse polarity is Direct current electrode positive or DCEP.
I'm new to the site and have a question on Spot Welding with a MIG. I have a Miller 252 with the std. M-25gun and have been welding for about two years now. I need to do a lot of automotive sheet metal body part welding as a hobby (restoring my old car) and need some advice on doing spot welds with my MIG machine. Most of the steel I will be spot welding will be approx. 18 and 22ga.