[Jewelry making - Article 00332] - [Orchid] Oven soldering

[Martin James]

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>     Also, why would some of our sterling castings come out of the
>     furnace with a pinkish color all over, and sometimes come out just
>     fine? What is happening inside to bring so much copper to the
>     surface? Is there some kind of possible contamination from our
>     solder? Rotten batch of metal? Chemical reaction in the furnace
>     atmosphere? Elves? Magic? 

    We have seen that kind of discoloration when using brand new flasks.
    Almost looks like brass plating that has been soaked in acid. I
    think it has to do with the stainless. We haven't noticed a problem
    in the finished pieces. 

    ABI has a video that covers using a electro melt for oven soldering
    in conjunction with their tack welder. 

    I think I would start with easier solder and work up the temps till
    it works as higher temps cause more problems.

Peace Marty


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