At 16:51 11/11/96 -0600, you wrote:
Does any one have recipies for making solder ,silver/gold especialy red gold?
I recommend purchased solders as your best bet, you can buy them in all
colors. However if you have to make some you can use brass (standard brass
a 'prealloy' containing 35% zinc and 65% copper) this allows you to alloy
it with a chunk of the gold you are using and so retain a similar color.
You will however not be abel to sell the piece in the US legally because it
is not 'plumb' (the same carat as the gold used) unless you add some finer
content gold to the piece to make up for the lower carat solder being used.
You don't want to make too much and you'll have to experiment with relative
amounts, melting temp etc.
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, as Charles said, 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 solid.
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.