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Beginner soldering, and old pennies

Hey folks,

I’d seen a neat tip in the archives about using pre-1981 pennies for
soldering copper to get a copper-colored joint, but due to my
inexperience in soldering I can’t seem to get it to work. I annealed
the penny, flattened it out into a disc larger than a quarter, then
cut tiny savings off it to solder with. But try as I might I can’t
get it to flow.

Using a medium-hard silver solder, a regular propane torch and
Batten’s flux I can solder the same type of joint fine, but so far
it seems like the old penny has a melting point very close to the
copper wire I’m trying to solder.

Just curious if anyone can enlighten me as to what I may be