Hi Bill,
There's been some discussion about the benefits of mig welding as a viable
alternative to spotwelding.
I tend to agree with Gary Bouffard. With a little practice I've had some
pretty good luck with my MIG welder.
By drilling larger holes in the replacement panel than in the host metal
you'll be assured of a completely penetrated weld. You really need to make
sure the panels are as close as you can get them. I know it's difficult to do
from both inside and outside the car.
The other alternative is to run a bead from underneath where the replacement
floor panel meets the host metal.
Good luck
Bob Stahlbush
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