[Jewelry making - Article 00852] - Re: [Orchid] Heavy Platinum Welding

[leonid Surpin]

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    As I understand, you have plain platinum band with cross-section
    5mmx3mm. 

    If you want to increase the size by adding a piece, one way to do it
    would be to open ring to the required size and using torch and thin
    wire to fill the gap by melting small amounts of metal and fusing 
them
    with the ring a bit at a time. In this way you do not even have to
    cast a sizing section, and it would guaranty solid fusing through out
    the cross-section. It would be like sculpting using the torch. If you
    never did it before, practice on some scrap prior. 

    That said, I do not understand why the ring is not stretchable. You
    should be able to increase the size of the ring by careful forging
    with cross-peen hammer. Try to anneal the ring before stretching it.
    Remember, to anneal platinum, one must bring it to bright orange and
    keep it at that temperature for at least 30 seconds. 

Leonid
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