[Jewelry making - Article 00299] - Re: [Orchid] Hydrogen Melting Questions

[Bruce Holmgrain]

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>        I am getting ready to do a project using a blend of Pure
>     Silver, Palladium, Ruthenium,Platinum, and will be using
>     Hydrogen/Oxy from the torch to do the melt and pour and I will use
>     an Argon Gas to put a blanket of inert gas over the melt to keep
>     down the scale and carbon. 

    Although I have never tried this particular combination, I have
    never found oxides of either palladium nor ruthenium to be a
    problem. I have only used ruthenium sponge to make 95% platinum
    alloy. Oxides have never been a problem for that. Palladium gives up
    it's oxides at around 1100F. Silver only oxidizes in ozone. Even if
    oxygen was to be a problem, I am puzzled as to how you would "cover"
    your melt with argon when a high pressure stream of burning gas is
    blowing it right off of the melt. What percentages are you
    considering? Perhaps the the silver and platinum will cover the melt
    just fine? 

>        I will be soldering pieces of 22K Green Gold on the cast pieces
>     an will I need to go back to Butane/Oxy to do that? 

    Just about any torch will do on this soldering job. 

Bruce D. Holmgrain
Goldwerx
http://www.goldwerx.com
guy AT goldwerx.com
JA Certified Master Benchjeweler, CAD/CAM Services

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