Question

Which of the following is an exclusively cold working process?

• A. Spinning
• B. Deep drawing
• C. Rolling
• D. Extrusion

Hint:

Cold working increases strength through strain hardening but reduces ductility. Deep drawing is a common cold working method for manufacturing cups, shells, and similar shapes from metal sheets.

Answer 1

The Correct Option is B

Cold working processes are those performed below the recrystallization temperature of the metal, generally at room temperature. Among the given options: - Spinning can be performed both hot and cold. - Deep drawing is a process used to form sheet metal into desired shapes at room temperature, making it exclusively a cold working process. - Rolling can be performed both hot (hot rolling) and cold (cold rolling). - Extrusion is typically a hot working process but can also be done cold in specific cases. Thus, deep drawing is the only process listed that is exclusively performed in the cold working domain.