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Tap has a dial that "clicks" into a pre set position. Continuous is a fully adjustable output voltage. The tap type will work good, but for a finer adjustment, the continuous is better. I forget what the def of tap is...it's been a while.

I agree with Jason. A mig will work on most things and not warp the product. 75/25 shielding gas is the way to go. You can also do aluminum with it with a wire and gas change. 220VAC is best, but there are some good 110VAC units. Stay away from "tap" type welders...like the kind Home Defect...