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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.
how mig welding works mig weld welding requires three things electricity to produce heat an electrode to fill the joint and shielding gas to protect the weld from the air mig welding is done using a very small electrode that is fed continuously while the operator controls the amount of weld being done