Quarter Panel Spot Welding
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Laughing Gas
Joined: Jul 2001
Posts: 1,019
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From: Bismarck, ND
Quarter Panel Spot Welding
A question to the masses:
When changing out a quarter panel (this one will be on a pickup box, but the question is probably universal), what can be done as far as finishing the inside of the sheet metal that will still allow solid spot welds along the seams? Specifically, I would like to scuff and refinish the inside of the panel with POR-15, as I've had great luck with it on other applications. However, I'm sure that I may have problems if I finish the inside edges of the panel (along the seams) and then try to spot weld through. Is "weld-through" primer the only thing that can be used to help protect the metal on the inside, where the panels overlap and are spotted together? Can a thinner grade of enamel (Rust-Oleum) be used? I would just like to do whatever I can to prevent a reoccurrence of rust-through wherever two panels are sandwiched together. Any input would be appreciated.
When changing out a quarter panel (this one will be on a pickup box, but the question is probably universal), what can be done as far as finishing the inside of the sheet metal that will still allow solid spot welds along the seams? Specifically, I would like to scuff and refinish the inside of the panel with POR-15, as I've had great luck with it on other applications. However, I'm sure that I may have problems if I finish the inside edges of the panel (along the seams) and then try to spot weld through. Is "weld-through" primer the only thing that can be used to help protect the metal on the inside, where the panels overlap and are spotted together? Can a thinner grade of enamel (Rust-Oleum) be used? I would just like to do whatever I can to prevent a reoccurrence of rust-through wherever two panels are sandwiched together. Any input would be appreciated.
Elder User
Joined: Aug 2001
Posts: 589
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From: Crossroads of America-Ind
Quarter Panel Spot Welding
[updated:LAST EDITED ON 18-Dec-01 AT 06:01 AM (EST)]You can usually MIG weld within about a 1/4 to 1/2" of cured POR-15 and it won't lift or burn. Besides 3M weld thru primer, I don't know of anything else that takes the heat like that. Try and recoat the welds (if at all possible) when your done. I turned my bed over and painted every square inch of the bottom with it when I was done.
Good luck,
Good luck,
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Laughing Gas
Joined: Jul 2001
Posts: 1,019
Likes: 3
From: Bismarck, ND
Quarter Panel Spot Welding
Thanks for the info..... I was also considering B-B-Q or engine enamel, but I'd probably end up making more of a mess than anything. I'll just plan on using some of the POR-15 reducer to thin out the paint a bit, and try to flow it into as many places as I can after welding. (I won't be doing this until early spring.... I'm just planning it out at present.) Thanks, again!
Elder User
Joined: Aug 2001
Posts: 589
Likes: 2
From: Crossroads of America-Ind
Quarter Panel Spot Welding
[updated:LAST EDITED ON 18-Dec-01 AT 09:46 PM (EST)]If you thin it like that it should flow in nicely. I'd put two coats on to, since it would be so thin. When the paint is fresh (new can) it'll probably flow pretty good anyway without thinning. You can cover it with paint or undercoating later if you want also. Good luck,
Senior User
Joined: Jun 1999
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Quarter Panel Spot Welding
The rust through primer is just cold galvanizing compound. It does a good job of stopping rust. sealing the seam is the best way to keep moisture out of the joint. When welding make sure you have good ventilation. A small amount of zinc is vaporized and is not healthy to breath. Youu would probably have a similiar problem with POR as it probably releases Isocyanates.
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