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Argon is more expensive than ultramix, but works fine for both steel and aluminum.
I do not understand why you reversed the polarity. I am thinking it could be part of your problem. On top of that, I don't know whether you ever will get full penetration with that sized welder on 1/4" stock.
FWIW, on my tig welder, I use DC "electrode negative" for steel and stainless, AC for Aluminum and DC "electrode positive" only to form a ball on my electrode prior to swithing to AC for welding aluminum.
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Last edited by Tim Hancock; 04-14-2009 at 07:50 AM..
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