GATE 2022 ME (ME2) – Question 28

Machining and Machine Tool Operations · Abrasive and non-traditional machining processes · 1 mark · Multiple select

Which of these processes involve(s) melting in metallic workpieces?

Show answer and explanation

Correct answer: (B) Electric discharge machining; (C) Laser beam machining; (D) Electron beam machining

Explanation

Check how each process removes material.

**Electrochemical machining (ECM):** material is removed by anodic dissolution (an electrochemical reaction). There is no melting.
**Electric discharge machining (EDM):** each spark heats a tiny spot above the melting and vaporisation point, so metal melts and is flushed away. ✓
**Laser beam machining (LBM):** the focused beam melts and vaporises the metal. ✓
**Electron beam machining (EBM):** the kinetic energy of the electrons becomes heat, which melts and vaporises the metal. ✓

So the processes involving melting are **EDM, LBM and EBM** (B, C, D).