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Addition of ___________ increases the mechanical properties of a tin-lead solder.

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Addition of ___________ increases the mechanical properties of a tin-lead solder.

(a) Bismuth

(b) Tellurium

(c) Antimony

(d) Molybdenum

This question was addressed to me in an interview.

The above asked question is from Soldering and Brazing in chapter Metallurgy of Welding, Brazing and Soldering of Engineering Material & Metallurgy

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The correct option is (c) Antimony

The best I can explain: Addition of antimony up to 60% of the tin content increases the mechanical properties of the solder. However, this results in a slight impairment of the soldering characteristics. Of the various solders of this type, the composition of Pb is the highest, whereas that of antimony is lowest.

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