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I am welding in floor pans in my 66 coupe with my Hobart 175 amp welder. There are 4 heat settings (1,2,3,4) and 10 speed settings (10,20,30,40,50,60,70,80,90,100). My floor pans are the cheap ones. When I set the heat to penetrate the uni body, it melts the floor pans, when I set it so it doesn't melt the floor pans, doesn't seem to penetrate. The floor pans seem to like a 2 heat setting and the unibody seems to like the 3 heat setting. I know I need to fine tune it, but any suggestions out there? faster speed with lower heat etc...