Welding that sounds like a major pain to me, and I am a welder. You are going have a lot of paint work, maybe a burned headliner, a lot of grinding if you want to make it look nice.
My suggestion would be a to cut a patch that overlaps the hole by about 1.5". Then I would use butyl tape and rivets to fasten it down, without leaks.
McMaster has sealing rivets and butyl tape, they call it, "non-hardening caulk."
I don't know what gauge metal the roof is, but you might be able to find some snips to cut out your damaged area, meaning no heat, metal shavings or sparks flying in your van.
One tip, if you use tin snips / aviation snips, stop short cutting the full length of the blade for each cut...so each cut is about 3/4 the length of the blade. This will prevent nasty sharp edges/points.
You could also use a Whitney Punch or similar so you don't have to drill rivet holes in the existing roof material, just an idea so you don't accidentally punch through a headliner and again no shavings.
|