Originally Posted by
MikeB52
....
Yes, ugly welds, but for 20 gage sheet metal, I find that the dot approach is the only way to ensure no warps, and no blow throughs, or very few blow throughs.. quick zap, get puddle started, stop. Move to a new spot, spread the heat, go back and forth, up and down the length of the repair, slowly closing the gaps between the dots.
Flip the panel over and do the same from behind to balance the metal bias and flex.
Grind everything almost away, repeat.. slow and tedious/meticulous work. But the goal is a smooth finished contour with minimal lead or filler needed to feather the final repair...