spot weld cutter?

I admit to doing my stuff somewhat crude. like floor pans i cut off with cut off wheel, get it where I can get a sharp chisel under the old pan where its spot welded to the subframe, after off, I grind down the subframe.
I have some rear frame repair to do and will be easier to cut out some spot welds with the "tool"! luckily just a small number of welds! luckily I just work on my stuff and NOT a real resto guy!!!!! ha