I have a 185A tig welder. I have gotten pretty good with it welding sheet metal patches for car restorations. Usually butt welding 20ga mild steel at 35A. But I alway have this problem. My weld bead has a channel on each side like a little ditch. The bead is higher than the surrounding metal and the ditches lower. I metal finish this out with hammer and dolly but it always take a long time. My HAZ is about 1/2" on either side. Any suggestions on how I can change my technique to eliminate or minimize this effect?
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TIG on 20ga steel weld bead problem