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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.
in mig welding the voltage is what is controlled and adjusted when comparing mig welding to arc or tig welding mig welding machines use voltage settings to set the machine tig and arc welding machines use amperage to set the machine or a constant amperage power supply