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Canadian Poncho Homepage -> Canadian Poncho -> The Lounge -> Need more info on Brass welds/Brazing...
Post Info TOPIC: Need more info on Brass welds/Brazing...
mike667


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Need more info on Brass welds/Brazing...
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Hey Guys,

I just need some more info on brass welds back in the day? I have a quarter panel that appears to be brass welded on. The paint is all cracking there, assuming the flux wasnt removed. The whole panel where it was welded, the paint/body filler has cracked. I can still see the flux along the weld still on the top. 

Can I grind down the flux on the weld on the quarter panel and repair? How was brass welding done and hold up? If I grind the flex off, epoxy prime, and metal filler. Will it hold up. Or does the panel have to replaced again? Were the brass welds strong?

 

Thanks, Mike



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dcneric


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Brazing as you guessed was very popular up into the eighties. The practice was to put filler direct to metal. Bondo does not adhere to brass for long term. With the introduction of epoxy primers and the drifting away from lacquer primer, primer is laid down directly to bare metal. Disclaimer From my experience epoxy primer sticks well to all metals prepped with 80 grit or coarser. Body filler will adhere well to the epoxy primer. I prefer 36 grit to rough the epoxy primer prior to filler.

Properly brazed panels will hold up very well.

I have not experienced it but have heard people claim that the different expansion rates of brazing to parent steel causes the finished surface to become wavey along the seam. The seam is narrow and very thin so I am not convinced of that argument. I think it goes back to the issue that filler does not adhere to brazing for the long term.

Again my statements are based on my experience. Hopefully others chime in as I always look forward to learning more and reading different experiences.

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Prefectca


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Years ago I was at a body shop that a friend worked at. One of the cars in for repairs was a 1978 or 9 Lincoln town car. It was hit on the left front and a new fender was purchased from Ford. The nose of the fender was made in two pieces and brazed together. The design of the fender made it impossible to spot weld. The welding appeared to have been lightly sand blasted after it was welded and metal finished. I was surprised that the front portion hadnt been primed afterwards. The parts had been primed before being assembled but not touched up after.

Paul

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mike667


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If its that strong can I just grind off the flux and epoxy and fill it?

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694279


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sand blast is the answer than epoxy prime

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norontcan


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I'd be hesitant to sand blast on a 1/4 panel unless it's at a crease.

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