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Copper and aluminum can be joined by brazing when _________ alloy is used.

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Copper and aluminum can be joined by brazing when _________ alloy is used.

(a) Copper-zinc

(b) Aluminum-silicon

(c) Copper-tellurium

(d) Aluminum-zinc

The question was posed to me in an online quiz.

This key question is from Soldering and Brazing in portion Metallurgy of Welding, Brazing and Soldering of Engineering Material & Metallurgy

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The correct option is (b) Aluminum-silicon

To explain I would say: Most metals and alloys such as carbon steels, cast iron, stainless and alloy steels, brass, and others can be brazed. Aluminum and copper can also be joined if an aluminum-silicon alloy is used as the brazing filler metal.

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