Mig Welder Choice 110 or 220

if your hanging a quarter panel and your butt welding it you going to want to do spot welds ONLY! I would start by spot welding in all the corners of the panel to assure that it stays where you want it. You need to skip around alot as not to get too much heat into the metal and warp it. take your time and dont be in a hurry. when i did my floor pans i did a tack weld about every 6" all the way around the perimiter. then go in the middle of the previous round. keep going until you have one continuous weld all the way around. they also make panel alignment clips for butt welding panels.