Clean with steel wool, use rosin flux sold for copper plumbing, 1/8"
diameter 60/40 tin/lead solder is fine since you are not going to ingest
it, and a LARGE soldering iron (at least 100 watts, 250 preferred) or a
propane torch. You could use rosen core electronic solder but you will
use a lot of it.

Pat wrote:

I am trying to make some wire sculptures with #8 copper wire but I
cannot seem to get the solder to stick to the wire. What is the proper
solder and soldering method to use?