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Brazing refers to a group of metal-joining processes in which
the bonding material is a nonferrous metal or alloy with a melting point higher
than 425 °C (800 °F), but lower than that of the metals being joined. Brazing
includes silver brazing (erroneously called silver soldering or hard soldering),
copper brazing, and aluminum brazing.
Brazing requires less heat than welding and can be used to join
metals that are damaged by high heat. However, because the strength of brazed
joints is not as great as welded joints, brazing is not typically used in
structural applications. In deciding whether brazing of a joint is justified, it
should be remembered that a metal, which will be subjected to a sustained high
temperature in use, should not be brazed.
A brazing flux is necessary to obtain a good union between the
clean base metal and the filler metal. There are a number of readily available
manufactured fluxes conforming to AWS and AMT specifications.
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