Separating spot-welded body and frame parts

Yes, i had the pilot bit in my air drill, the bigger bit in my electric. Some welds can be seperated with a 1/4" bit. The floorpan ones are big welds. A 3/8" just about does it with those. On floorpans that are rusted out that i am trashing, i dont use the drill method. I cut the sheet metal out around the frames, then grind down the spotwelds and chisel off the strips of metal thats left from the old floor. In this way theres no drill divots in the framerails to fill and grind down.