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GATE 2019 ME (ME1) – Question 24

Casting, Forming and Joining Processes · Welding, brazing, soldering and adhesive bonding · 1 mark · Multiple choice

Which welding method gives the highest heat flux (W/mm²)?

  1. Oxy-acetylene gas welding
  2. Tungsten inert gas welding
  3. Plasma arc welding
  4. Laser beam welding

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Show answer and explanation

Correct answer: (D) Laser beam welding

Explanation

A focused laser concentrates energy on a very small spot and therefore produces very high power per unit area. Oxy-acetylene flames and the listed arc processes distribute heat over larger areas. Among these options, **laser beam welding, D**, has the highest heat flux.