Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 7th Sem New 2172111 Advances In Welding Metallurgy Previous Question Paper
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2172111 Date: 19/11/2018
Subject Name: Advances in Welding Metallurgy
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1
(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
1. Arc Stability 2. Distribution of arc heat 3. Efficiency 4.
Power factor 5. Cleaning action 6. Maintenance 7. Cost
07
Q.2
(a) Calculate heat Input for SMAW Process Current- 200 A,
Voltage- 14 V, Travelling Speed- 200 mm/min, process
efficency ? = 60%.
03
(b) Explain the Limitations of Conventional Power Sources
& discuss the salient features available with the Latest
power source equipment.
04
(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
07
Q.3
(a) State development in MMAW Electrodes for Improved
toughness and Improved hydrogen control.
03
(b) What is Low Hydrogen Electrodes? Why they are
developed?
04
(c) Explain Specifications of following Consumables : -
(1) E 6013 (2) F70A2-EL8 (SAW FLUX + WIRE) (3)
ER 70 -S6 / ER 70-S2 (4) E71T - 1
07
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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2172111 Date: 19/11/2018
Subject Name: Advances in Welding Metallurgy
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1
(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
1. Arc Stability 2. Distribution of arc heat 3. Efficiency 4.
Power factor 5. Cleaning action 6. Maintenance 7. Cost
07
Q.2
(a) Calculate heat Input for SMAW Process Current- 200 A,
Voltage- 14 V, Travelling Speed- 200 mm/min, process
efficency ? = 60%.
03
(b) Explain the Limitations of Conventional Power Sources
& discuss the salient features available with the Latest
power source equipment.
04
(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
07
Q.3
(a) State development in MMAW Electrodes for Improved
toughness and Improved hydrogen control.
03
(b) What is Low Hydrogen Electrodes? Why they are
developed?
04
(c) Explain Specifications of following Consumables : -
(1) E 6013 (2) F70A2-EL8 (SAW FLUX + WIRE) (3)
ER 70 -S6 / ER 70-S2 (4) E71T - 1
07
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
Q.4
(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 (ii)
Welding Simulation.
07
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This post was last modified on 20 February 2020