[Jewelry making - Article 01013] - Re: [Orchid] I must be getting too old for this

[James Binnion]

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    Hi Bruce,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. A paste flux
    containing fluorides may help in dissolving the silicon dioxide and
    allowing the wetting of the metal. Silicon is often used in lower
    karat (14-9K) cast gold alloys to act as a de-oxidizer and to
    increase fluidity of the molten metal. It is not typically used in
    rolling alloy or in higher karat alloys. Silicon makes some alloys
    easier to cast but it sucks if you have to solder alloys that have
    high silicon content. 

Jim


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