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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.
MIG welding is an acronym for Metal Inert Gas Welding. This process is sometimes also referred to as Gas Metal Arc Welding (GMAW). MIG Welding is used for aluminum as well as other metals and can be automatic or semi-automatic. MIG Welding uses a wire that is connected to a direct current source which acts as an electrode and combines two pieces of metal through continuous flow by use of a welding tool or gun.