this is a peculiar problem i have with one of my friend. To weld 2 huge sheets standing vertically, he welds from inside while putting vertical supports from outside.He cannot weld from outside due to structural difficulties. After welding, the vertical supports are removed by hammering. what remains sticking to the surface is the weld joint that was formed between the temporary support and the parent sheet. this weld joint is then removed by grinding. the problem now is that on the outer surface, the pits formed due to grinding remains.this causes aesthetic problem. Is there any solution to this? is there any product that can remove the weld joint completely requiring no grinding?