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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.
Most aluminum will come from the factory with oil and grease on it. To clean the joint prior to assembly, first degrease the surfaces with a solvent, and then use a cheesecloth or paper towel to clean and dry the welding joint (these are preferred because they are porous and will absorb more oils/moisture).