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Cleaning up butt welds on panels

Hey Everyone just after a little help. just start restoring my Hq sedan and having to replace rust rear floor pans and panel section the common areas. Iv been butt welding the donor
section from a donor cab. when cleaning the welds up are people
grinding/cleaning flat both sides of the panel or just the show side. Regarding my floor pans should i just clean up the out side and leave in as it is as it is not seen. Sorry for the basic question

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if you cant see the weld ie, inside a door, don't worry about grinding it back.

paint it with bitumen, no worries..
my mate welded floorpans into a '59 el camino and left the welds proud, stronger that way

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No point grinding what won't be seen unless you are really anal , grinding = heat = distortion , main issue is sealing the back of welds on body panels with seam sealer or bitumen as most likely you will be putting a skim of filler on outside and this will bubble if moisture gets in behind ( very few can weld without leaving pinholes !! ) doesn't really matter on floor as underside will be coated with bitumen or underbody sealer and floor will be covered with underlay and carpet.

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I've never been game to ask a rwc bloke his version of what that means when we've butt joined in floor pan sections. From Vic roads

https://www.vicroads...

"Wherever possible, the floor panel should be joined at
the original lap joint. Where a non-original joint is
transverse in the floor pan the minimum overlap is to be
12.5 mm"
Try not to grind too much out of the weld if its under the carpet don't bother

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Get up that ladder grandpa your only 66.

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