[Jewelry making - Article 00770] - Re: [Orchid] Using MAPP gas for silver work?

[James Binnion]

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>     At one extreme is platinum. We play our torch on the joint, the
>     heat stays near the joint but we need to get it really hot, so we
>     use a very hot but rather small flame. At the other extreme is fine
>     silver. The heat from our torch is rapidly conducted away to heat
>     up the entire work piece. The whole piece gets hot but our solder
>     flow point is much lower than the platinum example. For the silver
>     piece we need a fairly large QUANTITY of heat but not a really high
>     TEMPERATURE; with these requirements a tiny, super-hot flame can
>     get you in trouble much faster the a larger, cooler flame.
>     Think separately of TEMPERATURE and QUANTITY, it may help you (I
>     hope so). 

    This is why for any soldering operation on anything short of
    platinum or palladium I use a propane-compressed air torch with the
    appropriate sized tip (http://nationaltorch.com/3ab.html). Lots of
    heat at a manageable temperature. Little chance of firescale, or
    burning up all the flux or melting the work. Works from tiny tiny to
    teapot sized work. For casting I definitely use propane-oxygen but
    you have different requirements in needing to get the metal molten
    and cast as soon as possible. 

James Binnion
jbin AT mokume-gane.com
James Binnion Metal Arts
http://www.mokume-gane.com
360-756-6550


 
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