Andrew Gabriel wrote:
For bending a large thick piece of copper, it should be reannealed
during the bending process, or bent at a temperature which is high
enough to keep annealing it throughout the process. This counteracts
the work hardening caused by the bending itself.

Yes, yes...


One way this
used to be done with very large copper pipes was to fill them with
molten lead under pressure instead of sand, at a suitable temperature.

I want you to tell me more about this, please.