"Dave Plowman" wrote in message

In article ,
Robert Morein wrote:
I don't understand your reasoning. Electrical copper is, or should
be, in a completely annealed state. Heating the copper up isn't
going to hurt it.

Don't know the theory, but if you flex a wire close to a soldered
joint it will always break at the joint. Perhaps it's a chemical
reaction?

This happens with stranded wire because the stress tends to concentrate at
the point where the solder flow ends. I've pointed out other issues related
to insulation in another post.

[Thinks.] But don't you have to quench copper if annealing?

I don't think so. The usual rule is to quench to harden, and cool off slowly
to anneal.