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Which of the following filler metals is used for carbide tip brazing?

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Which of the following filler metals is used for carbide tip brazing?

(a) BAG-1

(b) BAG-4

(c) BAG-8

(d) BAG-18

I have been asked this question in an online interview.

My doubt is from Soldering and Brazing topic in chapter Metallurgy of Welding, Brazing and Soldering of Engineering Material & Metallurgy

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The correct answer is (b) BAG-4

The explanation: BAG-4 filler metal is used for carbide tip brazing and is composed of 39-41% Ag, 29-31% Cu, 26-30% Zn, 1.5-2.5% Ni, and 0.15% of other elements. BAG-1 freely flows into low and narrow capillary joints. BAG-8 filler metal is used in a controlled atmosphere or vacuum brazing, whereas BAG-18 is used for brazing of ferrous and non-ferrous alloys without flux.

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