Originally Posted by Yadkin
...But the factory metal here is the same gauge as where the floor points are, and his length of weld was much more than the factory.
That's why we always back up the location with heavier steel.
In the case of a floor pan, it's a heavy square, usually 1/4" thick with an extruded 1/2" hole (or a 1/2" Nylok nut).
In the case of a door pillar or roof rail, it's also a heavy strip of steel.
Both additions of steel are either MIG welded, projection welded or button welded in place. The idea is to spread the tension over a large area.