Thanks Guys, I have no problem welding on clean surface the heat, speed all is perfectly good. I have welded tons of patches but it always worked good with clean bare metal, with the path panels like kick panels, where it is big patch panel I have problems where one end I can put the ground clamp and the place where I weld is too far. Anyways I will clean enough of metal and seems like I have no other choice either. I even tried cleaning up surface of metal and tried with magnetic ground holder and still had trouble,
Ganesh