Best way to separate pinch welds

I rarely allow myself to use an air chisel because i somehow always end up with a slip here or there and making more work for myself lol, but they definitely make some jobs easier i used the drill method on my wheel house removal and the great thing about it is i was able to drill all the way through in a few places so that way i have alignment holes for when i put the inner wheelhouse back in after i finish widening it

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I did mine a little different. I kept the wheel house to floor welds intact and separated at the floor to frame and trimmed the floor off. Sorry getting of track.