Use a spring loaded Center punch and spot weld cutter. The trick is to center punch the spot weld so the cutter has a guide. Then start off slow with the spot weld cutter. Once it starts cutting you can apply more pressure and go faster.
I use the cheap Harbor freight spot weld cutters. I've used the same one for tons of cuts before I pressed to hard being in a rush and broke one. I just flipped it over since it's two cutters in one and went back to work. $5 for the cutter . Perfect for someone who's not going to use it for me then one project.
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Ahmad B
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