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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.
Use an aluminum patch, rivits and 5200 to seal from outside or use gluit on the repair from the inside. You can even use stainless screws but coat every one with 5200 before you screw them in. JB weld works okay on bare (lightly sanded) aluminum but it can crack from stress. If you have a rigid piece you can use it.