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I ran a Lincoln squarewave 185 at my home a number of years ago, no complaints. Think it was a 10 amp bottom end which is the most you'd want, those old miller econotig machines were 20 amp bottom which was too hot for thin material.
Like mt930 says a few extra amps will be needed for aluminum, add more preheat with a torch and you can stretch the 200 amp ac a bit farther.
People seem to get wound up with bigger is better or features. That squarewave 200 would likely suffice for most any automotive project in a home shop.
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