The heat can
also alter the temper of the cable and make it brittle.
(Unlike steel some copper alloys harden with slow cooling).
I work with brass
[and] copper a lot, but not the electrical kind,
but the sheet metal sort. Generally speaking, heating *anneals*
nonferrous metals; cold-working hardens and eventually makes them
brittle.
It is probably not entirely irrelevant that part of the issue here
isn't just heating the copper, but copper and solder dissolving into
one another. Alloys of semi-indeterminate proportions of copper with
tin and lead (or whatever you're using for solder) may well exhibit
properties not predictable from cold-working copper and brass sheet.
To solder or not is probably a debate that will go on
for a long
time.
Probably. And, of course, the answer will depend on the context, thus
ensuring the debate continues. :-/
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