Induction pipe end sealing - GIF

[clavius]

Yup. There are even special bolt remover induction heater wands. It's just like a stick with a bunch of different coils you can put at the end to get into different places. They're like $250 - $300. I've never used one, but I've been drooling over them on Aliexpress for a while.

A mechanic friend of mine has one of those sold by one of the bigger name tool suppliers that I have borrowed a few times. The thing is super handy and very effective. Heats a nut up to red heat within 20 or 30 seconds. No open flame of a torch and restricts the heat pretty much to just where you need it. It's a really useful tool for those occasions when you need such a thing.