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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.
It's a MIG welder with a pulse function. It also has a duty cycle of 30%, but he's welded at 150 to 170 amps on 1/2 plate with this welder and never had it shut down on him.Then he compares the MigWeld 250P to the Millermatic 251, which is another 200 amp MIG welder, although it doesn't have pulse.t's a MIG welder with a pulse function. It also has a duty cycle of 30%, but he's welded at 150 to 170 amps on 1/2 plate with this welder and never had it shut down on him.