Question

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

• A. Electrochemical machining
• B. Electric discharge machining
• C. Laser beam machining
• D. Electron beam machining

Hint:

Any process involving high-energy beams or sparks causes melting, but electrochemical processes remove material chemically without heat.

Answer 1

The Correct Option is B, C, D

Different unconventional machining processes remove material using different mechanisms. Only some rely on melting.
Step 1: ECM.
Electrochemical machining removes material by anodic dissolution, not melting. So (A) does not involve melting.
Step 2: EDM.
Electric discharge machining uses sparks that melt and vaporize the metal. Thus melting occurs.
Step 3: LBM.
Laser beam machining involves highly concentrated laser energy that heats the metal above melting temperature. Hence melting occurs.
Step 4: EBM.
Electron beam machining uses accelerated electrons to produce intense heat, causing melting and vaporization.
Thus melting occurs in options (B), (C), and (D).