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Gold solder?


#1

If I use silver 50% and brass 50% mixed together and after I use
gold 24k 68% mixed with silver and brass already mixed 32% so this is
became gold solder or not I want to know.

Thank you very much
I waiting your reply
Alongkorn Utsahaphan

End of forwarded message


#2

Hello Alongkorn Utsahaphan,

 If I use silver 50% and brass 50% mixed together and after I use
gold 24k 68% mixed with silver and brass already mixed 32% so this
is became gold solder or not I want to know. 

Yes it is gold solder, but you need to mix the other way around,
First mix the gold with the silver and at last moment the brass. Brass
contains approx 30% zinc and 70% copper . In this alloy it is
important to have this in, to lower the melting point. If you
overheat it will burn out. Usually cadmium was used for this, but
modern solders do not have this anymore. I have not found the contains
of these modern solder alloys. But if you know more please let me
know.

Maybe this will help you some,

The necessary amounts are by weights %

For soldering low carat gold

45% gold(Au)
35% silver (A)
20% cupper (Cu)
3% Tin (Sn)
4% Zink (Zn)
Melting point approx 620 degrees Celsius

45% gold(Au)
30% silver (A)
15% cupper (Cu)
2% Tin (Sn)
2% Zink (Zn)
Melting point approx 800 degrees Celsius
More cupper, tin and zink lower the melting point

Medium carat

60% gold(Au)
22% silver (A)
22% cupper (Cu)
3% Tin (Sn)
3% Zink (Zn)
Melting point approx725 degrees Celsius

60% gold(Au)
12% silver (A)
12% cupper (Cu)
2% Tin (Sn)
3% Zink (Zn)
Melting point approx 835 degrees Celcius

High carat

80% gold(Au)
8% silver (A)
12% cupper (Cu)
3% Zink (Zn)
Melting point approx 745 degrees Celsius

80% gold(Au)
3% silver (A)
8% cupper (Cu)
3% Zink (Zn)
Melting point approx 875 degrees Celcius

By exchanging silver with more copper you get a more red alloy Using
more silver instead of copper the coulour will be more yellow.

I hope you can do something with this

Greeting
Martin Niemeijer