For a nut, you want to heat the nut without heating the bolt as much. For bolts, you'll need to heat the area around as well. The thermal expansion will make the parts fit looser if done properly, and break all the rust/corossion bonds.
--Bushytails
Try mixing some acetone with automatic transmission fluid and soak it in that first
Have you ever heard of anything you can hook up to a welder to heat a nut until it's red hot? I'm sure I heard of something of the sort some time ago but I really don't remember. Sounds a lot more dangerous than using a torch but with all the nuts and bolts I ended up having to cut through I'd definitely consider it since I have a cheap little 70amp arc welder I never use.
Now that is an interesting combo, can you tell us more.
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