We often make two-tone rings using bi-metal casting, casting
the white gold first, then creating a wax around or within it and
casting the yellow gold. it seems to bond well and we've had zero
problems with this.
Wayne, are you saying what I think you're saying? You can
embed a 14K (for example) white gold piece into a wax and cast it
in 14K yellow gold and there will be no problems with the white
gold where it meets the molten yellow gold? I've done this in
platinum and 18K yellow, but didn't know it could be done in two
color gold where the melting points are so close. (Dang it; I just
completed a WG/YG ring where this method would have saved me a lot
of time!) Am I misunderstanding something here?
Cindy, Yes, that’s what I’m saying. The already cast white gold is
never made hotter than about 1200 degrees F in the burnout cycle,
the flask temp at pour is about 950 degrees F, and ther’es no
problem. I like to place the whole crucible back in the kiln, turn
the heat off and let it cool very slowly so that there are no
sudden shrinkage problems. Actaully, the Pt /gold double casting is
much more difficult… Try it!