GATE Manufacturing Processes I: Joining of Materials – Previous Year Questions
11 GATE previous year questions on Joining of Materials (Manufacturing Processes I, Production and Industrial Engineering) with answers and explanations, from every paper.
- GATE 2021 PI Q17 – Which defect is NOT associated with welding?
- GATE 2021 PI Q54 – An arc-welding DC source has linear characteristic with open-circuit voltage 60 V and short-circuit current 600 A. Melting energy is 10 J/mm³;…
- GATE 2022 PI Q51 – Steady GTAW uses 18 V and 160 A. Arc creation loses 40% of input power; workpiece convection/radiation lose 800 W. Find effective power melting the…
- GATE 2023 PI Q34 – Resistance spot welding uses current 4500 A for 0.2 s. Effective interface resistance is 400 × 10⁻⁶ Ω and thermal efficiency is 50%. Find heat used to…
- GATE 2023 PI Q59 – An arc weld is made at 25 V, 200 A and speed 2 mm/s. Heat used for melting is 80% of generated heat; unit melting energy is 10 J/mm³. Find volume of…
- GATE 2024 PI Q29 – Which ONE OR MORE statements about friction stir welding are true?
- GATE 2024 PI Q52 – Mild-steel butt joints are arc welded at 85% heat-transfer efficiency, ignoring other losses. First weld: 30 V,180 A,6 mm/s. Second uses identical…
- GATE 2025 PI Q16 – In which welding process is an exit hole common?
- GATE 2025 PI Q47 – For DC arc welding, voltage V (V) and arc length l (cm) satisfy V = 30 + 30l. Open-circuit voltage is 80 V. Find maximum possible arc length (two…
- GATE 2026 PI Q12 – Which statement about brazing filler material is FALSE?
- GATE 2026 PI Q13 – A 6 kW arc-welding source joins two similar metals. Total energy loss is 50%, weld cross-sectional area is 10 mm² and specific melting energy is 15…