Brazing is a metal-joining process in whichtwo or more materials are joined when a fillermetal – with a melting point lower than thoseof the materials themselves – is drawn into thejoint between them by capillary action. Theprocess uses magnesium-containing brazingalloy in the form of batch-plated strips. Duringflux-free brazing under high-vacuum, the aluminiumoxide skin breaks – before the brazingalloy starts to flow – and finally removed bythe vaporising magnesium.Brazing has many advantages over othermetal-joining techniques, particularly welding.Since the base metals are not melted, brazingallows much tighter control over tolerancesand produces a cleaner connection, normallywithout the need for secondary finishing. Becausecomponents are heated uniformly, brazingconsequently results in less thermal distortionthan welding. Brazing also provides theability to easily join dissimilar metals and nonmetalsand is ideally suited to cost-effectivejoining of complex and multi-part assemblies.
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