Someday, I look forward to learning how to weld better; I’d especially like to work with MIG and work on my TIG (I actually have a rudimentary setup, but haven’t done much with it yet). So, I’d hardly classify myself as a welding expert (though with two pieces of clean metal I can make a pretty nice stick bead).
Until, if ever, I master welding, here are a couple threads that discuss welding sheet metal together for body repair. If you have any other great, helpful threads, let me know and I’ll add them here.
http://weldingweb.com/showthread.php?t=39466
http://weldingweb.com/showthread.php?t=43249