[Jewelry making - Article 01018] - Re: [Orchid] I must be getting too old for this

[David L. Huffman]

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>        You are probably working on alloys containing silicon. The
>     silicon when heated forms a silicon dioxide layer on the surfaces
>     of the metal and is resistant to wetting by the solder 


    Hi Jim and Bruce; 

    WOW!  Now it all makes sense.  Thanks Jim.  I had suspected silicon,
    but not knowing the chemistry, I ruled it out, figuring that the
    silicon burned off during the casting process.  Years ago, I used to
    use a silicon containing gold alloy and I don't remember having
    problems, but of course, back then, we used cadmium bearing solders
    and flouride fluxes without concern.  I suspect too that it's often a
    matter of degrees, as in 14K not so much a problem . . . 10K more
    problematic.  Seems you may have answered both my question and
    Bruces.  Guess I'll just have to resort to the old flux when I seem
    to be having problems. 

David L. Huffman


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