GATE ME 2020 Set 2 — Question 20

MCQ+1 / -0.33MediumWelding ProcessesJoiningManufacturing ProcessesWelding Metallurgy & HAZ

Manufacturing Processes → Joining → Welding Metallurgy & HAZ

Last updated 5 September 2026

Question

Two plates, each of 6 mm thickness, are to be butt-welded. Consider the following processes and select the correct sequence in increasing order of size of the heat affected zone. 1. Arc welding 2. MIG welding 3. Laser beam welding 4. Submerged arc welding

Correct answer (D) 3-2-4-1 Solution The size of the Heat Affected Zone (HAZ) is primarily determined by the heat input density of the welding process. Processes with higher power density concentrate heat more effectively, resulting in a smaller HAZ. 1. Laser beam welding (3) has the highest power density and thus the smallest HAZ. 2. MIG welding (2) has a higher power density than submerged arc welding. 3. Submerged arc welding (4) typically has a larger heat input than MIG but is more concentrated than manual arc welding. 4. Manual Arc welding (1) generally has the lowest power density and highest relative heat input per unit length, leading to the largest HAZ. Therefore, the increasing order of HAZ size is 3-2-4-1. Turn this into a strength. Explore AI-powered practice and doubt support with Success Tracker.

Review answer and solution without JavaScript

Interactive answer checking needs JavaScript. The published solution is available below.

Correct answer (D) 3-2-4-1 Solution The size of the Heat Affected Zone (HAZ) is primarily determined by the heat input density of the welding process. Processes with higher power density concentrate heat more effectively, resulting in a smaller HAZ. 1. Laser beam welding (3) has the highest power density and thus the smallest HAZ. 2. MIG welding (2) has a higher power density than submerged arc welding. 3. Submerged arc welding (4) typically has a larger heat input than MIG but is more concentrated than manual arc welding. 4. Manual Arc welding (1) generally has the lowest power density and highest relative heat input per unit length, leading to the largest HAZ. Therefore, the increasing order of HAZ size is 3-2-4-1.

Continue learning with Success Tracker

Use Success Tracker to ask about the reasoning, then try another GATE ME question to check your understanding.

AI-powered practice· Unlimited practice on eligible plans

PYQs with solutions: Attempt available previous-year questions, then compare your reasoning with the worked solution. Coverage varies by stream.
Practice that adapts: Choose a topic, work on weaker areas and bookmark questions to revisit. Your attempts feed your progress tracking.
AI doubt support: Ask follow-up questions about a step or concept while practising, instead of stopping at the final answer.

Unlimited practice is available on eligible plans. Free practice and AI usage have limits; check the current plan allowances before choosing.

This page stays readable without an account. AI responses can be wrong; check them against the solution and source material.