Question

The hot working process is mainly used for achieving the high dimensional accuracy of the metal.

(a) True

(b) False

I have been asked this question during an interview for a job.

This intriguing question comes from Advantage and Disadvantage of Hot and Cold Forming topic in chapter Types of Die & Metal Forming Processes of Casting-Forming-Welding II

Answer 1

Correct choice is (b) False

For explanation I would say: In the hot working of metal components, the temperature is very high, which is more than the re-crystallization temperature of the metal. This high temperature leads to high thermal expansion of the metal component. This expansion varies the shape and size of the metal, so the dimensional accuracy of the metal component cannot be achieved by hot working.