The joining of metals by soldering and welding
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Soldering is the process of joining two metal objects together by a third soft metal alloy which is called solder. Solder is a metal alloy which melts at a lower temperature than the metals being soldered. Two types of solder are commonly used One is a soft solder, which is an alloy of tin and lead. The other is a hard solder, which is an alloy of copper and zinc and is often called spelt or silver solder.
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