I have a body work job on my car's roof panel on the 4 edges. I'll probably have to cut a square piece of it including a piece of a previous terrible job that I paid for, then weld a patch to replace it. The position of the repair seems to make a butt weld easier than a lap weld, but I have one problem. The position of the patch is on the joining of 3 panels: The roof panel, the column panel and I believe a panel that goes through the top of the windshield, where it's glued at.
Besides being careful trying not to cut through the panels below the repair, is it a problem that I just weld the beam with the new patch laying on top of the other parts? I imagine there are big chances the weld beam might catch on the underlying part and I'm not completely sure that's just the way it's done or if in those situations or if I'm expected to remove the whole panel, do the fix and then do the spot welds to fix the roof back in place.
Removing the whole roof panel is likely far beyond my skillset, I'm already venturing myself if I'm doing this repair which is not the easiest considering the position. I'm just weighting the pros and cons of trying it myself or paying another expensive fix on a cheap old car. Below is a picture of one of those roof edge fixes, the one that apparently is the worst. I realize I might have to shape the patch to follow the roof molding depending on how bad this rust is under the cracking paint, which will make it even harder.