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MIG not TIG?

Two members have now suggested a MIG, rather than TIG. That's OK with me, it would certainly save a lot of money. My only concern is that a buddy at work (who recently bought a TIG) has stated that aluminum must be welded with AC. All the MIG welders I've seen so far are DC only. Is this important? Also, will a MIG allow me to weld, say, a 0.090 thick angle to a 0.25 or 0.50 plate? In other words, when one piece is very thin and the other much thicker, is MIG still appropriate?


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