I've been welding since I was 11 years old in 1948. The best advice I see here is trigger speed. I f you have a mig with spot weld function take the time to set it up for the material your welding. May take a full hour to tune it in just right. Pics of a floor pan patch and overhead weld on 57 Chevy rear shock mount plate. Done with .023 wire and heat set HIGH to blend in spots.
Patch over factory shifter hole:
[img]https://i.postimg.cc/MM8kyW3G/Int-and-57-floor-001.jpg[/img]Overhead welds on 57 Chevy rear shock mount repair:
[img]https://i.postimg.cc/tsHhQwcx/Int-and-57-floor-002.jpg[/img]
