Here in Brazil is not so easy as in USA or other countries. There's
no stores or retailers, then we neeed to produce our own solders. I
have many solders alloys formulas, some of them I devenloped by
myself sometimes using empiric method.
The problem is get the same karat and color of the original alloy you
intents to solder.
Here's an 18 k solder formula for 18 k red gold:
- gold(999.9) - 75,0 %
- Silver(999.9) - 5,0 %
- Copper - 12,0 %
- Zinc - 6,0 %
- Cadmium - 2,0 %
18 k red gold solder alloy - 100,0 %
You must take care with the meltig points. Follow this steps: 1. -
Using a torch in a ceramic crucible Melt the gold + silver + copper.
2. - After this pre-alloy is melt, take of the torch and wait it get
3. - Using a plier or other tool, take of that solid but still hot
piece of metal from the crucible.
4. - Put the Zinc+cadmium(in small square pieces) inside the crucible
under the pre-alloy piece.
5. - Reduce the flame torch to a "soft" flame, then melt the
pre-alloy again slowly. Using this process, the zinc and cadmium
(low melting points metals) won't burn.
Christo in Brazil