I'm running about 78-80 amps on AC with 3/16" flat bar. I'm having problems with pretty much the whole thing. We run on 7" pieces, and the first 2 inches of my root pass is great. Then it starts to look a little inconsistent and eventually turns into either incomplete fusion or I get this pit down the center of the bead. On my cover pass, It either looks just terrible, or it will look good but the undercut is cut in probably half way through the thickness of the metal. I use a whip and pause for my root pass, and I either do a Z weave or and "up and over" motion. This is the only weld I have done that I have had trouble with. Any help is appreciated.
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6011 Vertical up T joint