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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.
A DC ARC welder that can go as low as 20-25 amps (if yours doesn't you may consider getting a current limiting diode, or get the Stitchwelder that has one) E6018 (aka. farmer rods) or better E7018 1/16 welding rods (which need to be baked before use) Thin sheet metal, 0.021 was what I used.