I've used different methods as of late. My cowl panel was done with an old Snap-On center pilot drill bit spot weld cutter. Didn't bother me to weld up the center 1/8" hole on the panel that was staying. Comes in different diameters. As far as I'm concerned, easier to use than the center spring loaded awl type that Mac is selling these days.
When I did the wheel wells on the Suburban, so much metal was going to be fabbed and replaced by me, that I took a disc sander, sanded the spot welds until thin, then used a spot weld splitter ( a hard steel bar with a knife edge) and sheared off the rusty pieces.
I haven't used a drill bit to separate spot welds for a long time!
