I have just shaved the locks and handles from the driver’s door of my 86 camaro. I mig welded the patches in very carefully, only doing 2 spots at a time and leaving it to cool down. Eventually I joined all the spots up into 1 continuous bead. Inevitably the panel warped slightly. Nothing that a skimming of filler won’t cure, but would Tig welding distort less on a door panel? I have seen them do it on overhaulin’, and cannot see any distortion. Or none that they will show.