Separating spot-welded body and frame parts

Thank you,
Finally a common sense write up instead of starting with "you need sheet-metal cutter".
I have found common drill bits are way faster than the sheet-metal cutters, just buy jobber bits at your local fastenal, they seem to stay sharp the longest, and are about the same price as hardware store bits.
Also I use two drills, one for the pilot bit and one for the 1/4" bit or in your case 3/8" bit, it always seems you miss a spot weld or two and changing bits consumes more time.