[tripletdaddy]

If you have an acetylene torch, then just burn the bolt end or nut end off. I don't have one so I've used an angle grinder ( a cutoff disc is better than a grinding disc), a sawsall, and a hacksaw. When I had to remove the bolts to the two hole flange, I slotted one of the two flanges. I can't remember if I had to or decided it was a good idea and it made it easier to remove the seized bolts. It was nice to have them for bolting things back together.