I have been looking for a way in which I can re-harden 14G copper
wire that has been annealed during the soldering process. This is for
a bangle project and hence I need the bangle to retain its shape and
hardness. However, they become really soft after the annealing and
tumbling in stainless steel shot for 5-6 hours doesn't seem to have
done the trick of hardening them back to the required stiffness.
Some of the techniques I read on the internet are. ..
1. Heating the metal to just below the annealing temperature and
quenching in ICE COLD water repeatedly (Though some people say that
quenching in water or letting it air cool does not affect the
hardness at all)
2. Sand blasting (but that would change the texture of the metal)
3. Hammering with raw hide mallet (But that would take too long
doing one bangle at a time. I was hoping for a more effective
process that did not require me to hammer away for long hours :))
4. Age hardening I read an article on Ganoksin by Gary Dawson about
heat treating metals where he talks about a process called Age
hardening to bring back hardness onto annealed metal. Also, it talks
about karat metal and sterling silver.
However, I am novice enough not to understand the actual process. I
would really appreciate it if someone could simplify it for me and
say what exactly to do in terms of copper metal.
Looking forward to hearing back from you. ..
P. S: It would be great if someone could provide a source for 14G
round HALF HARD copper wire. The highest gauge I have been able to
find in HALF HARD copper round wire is 16G.