Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 7th Sem New 2172111 Advances In Welding Metallurgy Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VII (New) EXAMINATION ? WINTER 2019
Subject Code: 2172111 Date: 26/11/2019
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) Expand the following terms:
1) SMAW,
2) PTAW and
3) FCAW.
03
(b) Discuss the effect of heat input and inter pass temperature on
mechanical properties of steel.
04
(c) State the various advances in the welding processes in terms of
productivity and quality.
07
Q.2 (a) What are static and dynamic characteristics of power sources? 03
(b) Sketch V-I characteristic of CC and CV type welding power
source.
04
(c) Enlist the electronic power regulation systems and explain the
salient features available in latest welding equipment.
07
OR
(c) Compare Thyristor Control ? Synergic Pulse Control ? Inverter
Control Power Sources in terms of features.
07
Q.3 (a) What are low hydrogen electrodes and the need for their
development?
03
(b) Explain Specifications of following Consumables:
1) E 6013 and
2) ER 70 -S6 / ER 70-S2.
04
(c) Write in detail about the type of shielding gases used in arc
welding processes. Give examples of three possible combination
of shielding gas mixtures for specific applications.
07
OR
Q.3 (a) Differentiate between agglomerated and fused fluxes. 03
(b) Justify or refute the following statement: ?Friction stir welding is
ideally suited for welding of Aluminum and its alloys?.
04
(c) With suitable sketches, explain different variants of friction
welding.
07
Q.4 (a) Discuss the effect of various welding parameters on weld bead
profile.
03
(b) Explain for which metals DC electrode positive (reverse polarity)
is suitable to use with GTAW Process?
04
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VII (New) EXAMINATION ? WINTER 2019
Subject Code: 2172111 Date: 26/11/2019
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) Expand the following terms:
1) SMAW,
2) PTAW and
3) FCAW.
03
(b) Discuss the effect of heat input and inter pass temperature on
mechanical properties of steel.
04
(c) State the various advances in the welding processes in terms of
productivity and quality.
07
Q.2 (a) What are static and dynamic characteristics of power sources? 03
(b) Sketch V-I characteristic of CC and CV type welding power
source.
04
(c) Enlist the electronic power regulation systems and explain the
salient features available in latest welding equipment.
07
OR
(c) Compare Thyristor Control ? Synergic Pulse Control ? Inverter
Control Power Sources in terms of features.
07
Q.3 (a) What are low hydrogen electrodes and the need for their
development?
03
(b) Explain Specifications of following Consumables:
1) E 6013 and
2) ER 70 -S6 / ER 70-S2.
04
(c) Write in detail about the type of shielding gases used in arc
welding processes. Give examples of three possible combination
of shielding gas mixtures for specific applications.
07
OR
Q.3 (a) Differentiate between agglomerated and fused fluxes. 03
(b) Justify or refute the following statement: ?Friction stir welding is
ideally suited for welding of Aluminum and its alloys?.
04
(c) With suitable sketches, explain different variants of friction
welding.
07
Q.4 (a) Discuss the effect of various welding parameters on weld bead
profile.
03
(b) Explain for which metals DC electrode positive (reverse polarity)
is suitable to use with GTAW Process?
04
2
(c) Explain the process of Hot Wire Tungsten Inert Gas Welding. 07
OR
Q.4 (a) Justify or refute the following statement: ?MIG welding requires
DC electrode positive (reverse polarity)?.
03
(b) Explain why in welding of certain materials, preheating and post-
heating are essential?
04
(c) Explain with schematic, pulsed spray transfer and explain merits
and de?merits of Pulsed GMAW.
07
Q.5 (a) Why vacuum is important in producing a good quality weld in
EBW?
03
(b) Explain the principle behind Laser Beam Welding. Write some
applications.
04
(c) Explain the process of Plasma Keyhole Welding. 07
OR
Q.5 (a) Explain the need for automation in welding. 03
(b) Explain the process of Needle Arc Micro Plasma Welding. 04
(c) Write a note on the contribution and use of computational tools to
simulate welding processes.
07
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This post was last modified on 20 February 2020