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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.
Argon is always going to be used for you and most people. Helium is used with aluminum really thick aluminum. I use it for tig welding aluminum over 1/4 just makes the arc hotter so you get better pennetration. The only other situation you use it is in dc welding aluminum which again is for really thick sections.