Quote:
Originally Posted by MP&C
If you can do a no-filler fusion weld, the OA or Tig does a nice job, but I think gravity helps any welding on a horizontal plane to sag a bit, looking like an undercut. Once planished, it will tend to fill in any voids that you should see a fairly flat panel, both front and back, requiring little to no filing/grinding. The caveat here is that you absolutely need access to the rear side to be able to planish.
What areas are you welding that do not have rear access?
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the rear quarter on my suburban, both sides