Which process is an example of forming of metals by plastic deformation?

• A. Casting
• B. Welding
• C. Drawing
• D. Machining

Answer: (C)

Forming metals by plastic deformation means permanently changing the shape of a solid metal using stress below its melting point, so the material flows plastically rather than melting. Drawing is a classic example: the metal is pulled through a die, which reduces its cross‑section and elongates it. The metal deforms plastically as it slides through the die, producing a permanently thinner, longer piece (like wire or tubing), and often work-hardening as a result.

Casting would involve melting and solidification rather than plastic flow of a solid piece. Welding is joining by local melting and bonding, not reshaping a single piece via plastic deformation. Machining removes material to shape the part, not forming it through plastic flow.