[Jewelry making - Article 00131] - Re: [Orchid] Copper solder

[Michael Honeycutt]

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    I have had some success with a type of solder called Fos-Flo #7. I
    bought it at IJS in Albuquerque. It's advertised in their catalog as
    producing  a light copper colored seam when used correctly. In my
    experience it's a pretty good solder but you have to be very careful
    not to overheat the stuff. If you overheat it it tends to, well, I
    call it "flash". You still get a fairly decent join but it leaves a
    silver colored stain that's a bear to get out. However, IF you
    control your heat carefully, it won't "flash" on you and it does
    produce what I think is a light copper colored seam as advertised.
    It just takes a little practice with the torch, solder and some
    copper to get it right. Here's a bit of data on it: 

    Melting temp: 1310*F or 710*C
    Flow temp: 1350*F or 730*C
    Composition: 92.75% copper, 7.25% phosphorus

    I use good old handy-flux with good success. Hope this helps or at
    least provides another option for your consideration. I don't work
    for IJS or anyone else for that matter. This stuff just works for
    me.  

Mike

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