Brian Adam wrote:
In message 961011180003_103125.1115_JHG56-1@CompuServe.COM you happened to mention:
How do you make your own solder?
Toronto, Ontario, Canada
Well, Dianne. I make the silver/copper eutectic alloy as a very nice solder.
Roughly 72% sil/ 28% copper.
A ‘eutectic’ of two metals is a particular mix which acts as a pure metal
with regard to (at least) melting charactetistics. It’s liquidus and solidus
are the same temp: 778deg celcius. So it has no ‘pasty’ stage like (especially)
easy solder. I like this in a hard solder. You find some manufactured
solders have a pasty stage (freeze range) between the liquidus and solidus
temps, so you can jiggle it about with the soldering pick. But eutectic goes
from solid to liquid it a split second and zooms right into the joint,
leaving a small filet (sp?). You know the filet? the way a soldered joint has
a new curve of metal at the joint, well this solder give very little. Hence a
slight or invisible line of solder is visible, and corners are sharp.
It’s recomm by Oppi!
- it’s a high temp solder. 778 is close to sterling’s solidus
which is when stg starts to melt.
- Your joint need to be tight. It does not fill gaps.
How to make it? This was your original question. Have you done any alloying?
Use clean dry electrical copper wire cut into even sized bits. You can add it
to clean stg scraps to make eutectic. You can make it from fine sil granules.
We’ll talk alloying procedure next time if that’s what you’d like.
BRIAN ADAM - on Acorn RiscOS - NEW ZEALAND
Eyeglasses, optica-absurda … and other sight-specific jewellery
Please edit your replies well.
Wonder if you have ever tried the mix of 20% cartridge brass and 80%
sterling or fine silver?It makes a good medium solder that I find is
about the same melting point and flow point as commercial medium
solders.Also wanted to note that some electric wire contains other
metals in addition to copper, beryllium is one and sometimes nickle and
these are added to electric wiring to increase the heat resistance of
the copper.Pure copper can be obtained as shot from the chemical supply
places among others…Gavin