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GATE 2020 ME (ME2) – Question 20

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

Two 6 mm thick plates are butt-welded. Select the processes in INCREASING order of heat-affected-zone size: 1: Arc welding; 2: MIG welding; 3: Laser beam welding; 4: Submerged arc welding.

  1. 1–4–2–3
  2. 3–4–2–1
  3. 4–3–2–1
  4. 3–2–4–1

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Show answer and explanation

Correct answer: (D) 3–2–4–1

Explanation

For the process comparison intended here, concentrated laser input gives the smallest HAZ, followed by MIG, then submerged arc, then conventional arc welding: **3–2–4–1,D**. HAZ also depends on heat input, travel speed and material; the ordering is the conventional comparison used by the source question.