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Welding sheet metal?

Old 01-28-2019, 06:21 PM
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Default Welding sheet metal?

I cut the bottom of the rear quarter panels out and I need to weld a piece of metal across the bottom. I have a mig welder with gas but I haven't welded much before. What are some tips for welding sheet metal?
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Old 01-29-2019, 04:15 AM
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Originally Posted by 00t444e View Post
I cut the bottom of the rear quarter panels out and I need to weld a piece of metal across the bottom. I have a mig welder with gas but I haven't welded much before. What are some tips for welding sheet metal?
Turn everything down just about a low as it will go for heat, what kind of welder do you have?
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Old 01-29-2019, 05:31 PM
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Originally Posted by 00t444e View Post
I cut the bottom of the rear quarter panels out and I need to weld a piece of metal across the bottom. I have a mig welder with gas but I haven't welded much before. What are some tips for welding sheet metal?
I wouldn't try and full weld. Dozens of small tacks. Work opposites like when you tighten your lug nuts. When ur done you should have tacks no more than half inch apart. No need to weld around. I used to do this and then braze all around but that much heat causes too much warpage and the burn on the opposite side promotes rust. Found that once tacked all around just do your body work and ur good to go. If you want do first pass with gorilla hair ( oops my bad, tiger hair, I guess the gorillas have a better union). I work it so the patch is on the inside. If need be tack a piece of wire to the patch to pull on it to keep tight.
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Old 01-30-2019, 03:20 PM
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Mate your 2 materials (body and patch panel) leaving a very small gap all the way around. Turn you feed speed and heat down low. You can use magnets to hold the panel in place. Make small tacks in the gap every 4 inches or so. Continue to tack around until its a solid line all the way around. Grind until flat and smooth. Use a thin coat of fiberglass bondo for first coat to fill smallest pin holes. Regular body filler next, primer the paint.
Practice on some 20 or 18 gauge scrap to get a feel for it. It's easier than you think, just practice first then go for it.
There's a lot of utube videos out there.

Last edited by MotoBoss; 01-30-2019 at 03:25 PM.
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