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A 115-volt welder can handle aluminum up to an eighth of an inch thick (3 mm) with adequate preheating, and a 230-volt machine can weld aluminum that's up to a quarter of an inch thick (6 mm). Consider a machine with an output greater than 200 amps if you will be welding aluminum daily.
If you use flux core wire, there is no need for shielding gas. However with flux core wire, you can only weld mild steel. Flux core wire can be used on any MIG welder, you just have to have the polatity reversed than you would for if you were welding with shielding gas.