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Q: When should I solder, and when should I weld platinum?
A: Soldering is usually required when you are working on a multi-metal piece, such as an 18K and platinum combination. The metal with the lowest melting point dictates the method used. Soldering is also preferred when attaching minor components to platinum, such as findings.
Sizing a platinum ring is normally done by welding, as long as there are no stones nearby and the ring is made entirely of platinum. When you need to use solder to size a ring, use a 1700 seamless solder or a high purity "plumb" solder. Lower temperature solders tend to show a seam.
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