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Originally Posted by The Reaper
Exactly. A little birdie must have told you that.
Heat transfer and metal expansion rates would be the explanation for your question, IIRC.
TR
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Yes, Little birdie whispered the term "Lincoln Locker" but I had practised the technique for near thirty years as needed. "Lincoln" refers to the great American welding machine and related equipment manufacturer. Heat transfer, or actually the lack of is correct. If you stack two steel plates together and try to cut them at the same time with an oxy-acetylene torch, you can't do it. The oxygen stream depends on a red hot pre-heat to get the steel to actually burn. The red hot pre-heat will not carry from one plate to the next in a continual heat so the oxygen won't cut the second plate of steel. Same applies to the nut, you can cut the nut off while it's on the bolt. The trick here is to work fast and do not overheat the bolt threads because you are very close to heating them up and cutting them also. I make two vertical cuts down the nut, 180 degrees apart and then gently tap it off with a hammer.