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Originally Posted by Lil Big Mec
If you heat the pipe with the sand inside, do make absolutley sure the sand is dry before you cap the pipe, or it can "explode" like a mini pipe bomb due to water vapour building pressure inside the pipe and splitting it open. I witnessed this on a friends race car, when they were bending up a rollcage for it. The welder who was doing the heating had some shrapnel in his chest and nasty sandblasting done to his face. Fortunately, he was wearing safety glasses, so he wasn't blinded. Has a pretty scarred/weathered face now though. Granted the tubing was 1 1/2" so it held a lot more sand but I still wouldn't want a small copper pipe bursting in my face and scaldin g me with steam  |
Yeah, I can see that happening. Good point. What you describe sounds like he was trying to heat the metal up in order to bend it easier while the metal was still hot.
Annealing is the process of heating the metal up and then cooling it down to make the metal softer and easier to work with. So it should be cold before you even start working with it.