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Which of the following materials is not used in making rivets?

(a) Wrought iron

(b) Mild steel

(c) Brass

(d) Calcium

I had been asked this question at a job interview.

This interesting question is from Riveting in chapter Joining Process of Casting-Forming-Welding II

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Right choice is (d) Calcium

For explanation I would say: Among the following, calcium is not used the riveting process. For the making of rivets, the used materials are wrought iron and mild steels. There are other materials also used in it, but they are used for small works, such as brass, copper and aluminium.

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