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As any silversmith knows, silver solder is the ideal material to use when joining sterling pieces by the traditional method of brazing. Sometimes I will receive an object which has been lead-soldered in the area in need of repair (or re-repair). Sometimes the joined area is not visually accessible, and I don't know if lead has been used.
In either case, I cannot use silver solder because the high temperature required will melt any lead in the joint and allow it to form its own alloy with the silver. Not pretty! And, using a low temperature tin/silver solder won't give me a sound joint or good silver color. For this reason, I have been exploring newer technologies for joining metals. So far, the German-made Lampert PUK 3s Professional Plus pulse arc welder has best accommodated my needs.