FWIW If I use a hefty spanner to undo a rusty bolt, then the bolt heats up as I unscrew it. I guess the heat energy gained by the bolt is directly equivalent to the torque I had to apply to undo it. OTOH therefore one would think that applying heat to a rusty bolt should make it unscrew itself but unfortunately for some reason I have never been able to get that to work ! ;-)
regards Andy Little
As a former Ironworker, I can tell you that if you apply enough heat, the rust will often pop right off. If that doesn't work, then you apply even more and... what bolt was that you were talking about... Just had to chime in from the peanut gallery. Also, make sure that you are solving problems that are really likely to occur. It is nice to be as absolutely type safe as possible, but often that gets in the way of getting real work done as well. Just a thought. joe