The GATE Grind

GATE 2026 MT – Question 14

Manufacturing Processes · Welding and joining · 1 mark · Multiple choice

Which one of the following fusion-welding techniques results in the least heat-affected zone (HAZ)?

  1. Submerged Arc Welding (SAW)
  2. Tungsten Inert Gas Welding (TIG)
  3. Electron Beam Welding (EBW)
  4. Oxy-Acetylene Welding (OAW)

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Show answer and explanation

Correct answer: (C) Electron Beam Welding (EBW)

Explanation

Electron-beam welding concentrates high power into a very small spot, producing deep penetration with limited total heat spread into adjacent material. Its short thermal exposure creates a narrower HAZ than the listed arc or oxy-acetylene processes under their usual operating conditions. Thus **electron-beam welding, C**.