Originally Posted by
popper
R5R - if you use sulfur, the Pb will not take much Cu - both do the same thing and S has precedence over CU. When I used the CS on WW, I got a small chunks of hard stuff which I mixed and smashed until it dissipated. I believe it is SbCu2 and that is OK. I don't know what the melt temp of that is, but it did go away. I wasn't using the PID when I did the WWs, I'm sure the temp was > 750F. I haven't done the penny thing yet, busy as a 1 armed paper hanger, wife took me to the ER last nite thinking maybe I had a blood clot in my leg. Checked out OK. Guess I just pulled something somehow. The Cu goes into free Cu (blue), SbCu2 and Cu into the lead crystal lattice, which gives the toughening.