How can I fuse copper wire to a copper cuff
It would be a lot easier and more accurate to solder the wire. It can be done with lots of practice and a hot torch using either oxy propane or oxy acetylene and small torch tips. I use a Smith little torch with oxy acetylene. You have to get the heaviest piece close to melting before bringing the wire in. Even so the bigger piece is so hot the wire if very light will melt first. Have fun! Sometimes the disasters turn out to be the most beautiful.