[RocktimusPryme]

Some people do it for the cleanest possible look, but butt welding is a waste of time IMO. The floor seams are overlapped from the factory and pinch welded in a bunch of places.

Personally I like to use a flanging tool to make the hole I cut out flanged. Then punch holes in the patch. Do a bunch of rosette welds. Seam seal and call it a day. Opinions will vary. But when it’s common practice to overlap/knock down the weld/add filler on exterior panels……why would you want to go nuts with something you are going to put carpet over anyway.