GTU BE/B.Tech 2018 Winter Question Papers || Gujarat Technological University
Seat No.:
Enrolment No.
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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (NEW) EXAMINATION — WINTER 2018
Subject Code: 2172111
Subject Name: Advances in Welding Metallurgy
Time: 10:30 AM TO 01:00 PM
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
| Q1 | MARKS |
|---|---|
| (a) State the various advances in the Welding Power sources In terms of process capabilities. | 03 |
| (b) Define Power density . Arrange different welding processes in scale of increasing power density. | 04 |
(c) Compare AC and DC Welding Power sources in terms of factors listed below
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| Q2 (a) Calculate heat Input for SMAW Process Current- 200 A, Voltage- 14 V, Travelling Speed- 200 mm/min, process efficency I] = 60%. | 04 |
| (b) Explain the Limitations of Conventional Power Sources & discuss the salient features available with the Latest power source equipment. | 07 |
| (c) Which shielding gases are used for following processes? (i) MS welding using MIG, (ii) SS Welding using TIG (iii) SS Welding using MAG (iv) PAW key hole mode | 07 |
| OR | |
| (c) Compare Thyristor Control - Synergic Pulse Control - Inverter Control Power Sources in terms of features | 04 |
| Q3 (a) State development in MMAW Electrodes for Improved toughness and Improved hydrogen control. | 07 |
| (b) What is Low Hydrogen Electrodes? Why they are developed? | |
| (c) Explain Specifications of following Consumables : - (1) E6013 (2) F70A2-EL8 (SAW FLUX + WIRE) (3) ER 70 -S6/ER 70-S2 (4) E71T -1 | |
| OR | |
| Q.3 (a) Draw schematic of various modes of metal transfers in GMAW. | 03 |
| (b) Evaluate Flux core wire gives higher penetration compared to solidwire. | 04 |
| (c) Compare Argon, Helium, Co2 Shielding gases in terms of properties & suggest suitable combinations of gas mixtures for welding of HSLA, S.S and Nickel based Alloys. | 07 |
| Q.4 (a) Differentiate between agglomerated and fused fluxes used for SAW Process. | 03 |
| (b) Explain for which metals DCEP is suitable to use with GTAW Process? How problem of Tungsten over heating is taken care of? | 04 |
| (c) Explain Narrow Gap Welding Processes for High Thickness joints with schematics. How can NGW joints save consumable, time and labour? Justify | 07 |
| OR | |
| Q4 (a) What are the benefits of Pulse TIG welding technology? Only draw pulse wave form. | 03 |
| (b) Explain the process of Activated Flux TIG Process & state the merits & demerits. How much plate thickness it can weld in one pass ? | 04 |
| (c) Explain the Principles, Operation & merits & demerits of Friction Stir Welding. | 07 |
| Q.5 (a) Draw schematic of Hot-wire TIG Welding Machine what is the source of pre-heating of auto feed wire? | 03 |
| (b) Define Plasma Welding. How Plasma Key-hole welding is done? How much power.density PAW offer ? | 04 |
| (c) What is the function of flux coated on the shielded electrodes? what do you'mean by E 316-15, E 316-16 & E 316-17? | 07 |
| OR | |
| Q.5 (a) Write Salient features of Fuzzy logic based intelligent Power Systems | 03 |
| (b) Differentiate between self-shielded and externally shielded electrodes. | 04 |
| (c) Write short note on (i) Robots in Welding automation (i) Welding Simulation. | 07 |
Date: 19/11/2018
Total Marks: 70
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