Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 6th Sem New 2162109 Metal Joining Processes Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2162109 Date:21/05/2019
Subject Name: Metal Joining Processes
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) What are the reasons behind welding being largely used in the
field of engineering?
03
(b) Classify and explain the flames of oxy-acetylene. 04
(c) Explain how gas-metal and slag-metal reactions take place in
welding.
07
Q.2 (a) What is weld decay? 03
(b) Write detailed classification of welding joint. 04
(c) Draw and explain CCT diagram of weldment with neat sketch. 07
OR
(c) Briefly explain Shielded Metal Arc Welding (SMAW) with a neat
sketch.
07
Q.3 (a) What is flux? Why is it essential to use it in some welding
situations?
03
(b) Explain direct current straight polarity (DCSP) and direct current
reverse polarity (DCRP)
04
(c) Explain about Atomic Hydrogen Welding with a neat sketch. 07
OR
Q.3 (a) Explain the role of inert gas in welding processes. 03
(b) Why is TIG welding preferred for welding aluminum plates? Give
reasons.
04
(c) Explain Wet Underwater Welding with a neat sketch. Give its
advantages and disadvantages.
07
Q.4 (a) Write down various steps in FSW. 03
(b) Explain the following terms with respect to characteristics of
Welding Power Sources.
1) Open circuit voltage (OCV),
2) Power factor (pf),
3) Static characteristics and
4) Dynamic characteristics.
04
(c) In a given welding operation, the power source is at 20 V and 300
amp. If the welding speed is 6 mm/s and transfer and melting
efficiency are 0.8 and 0.3, calculate the heat input.
07
OR
Q.4 (a) What is carbon equivalent? Discuss briefly how it is used in
welding industry.
03
(b) Discuss two examples of non destructive testing used in inspection
of welding defects.
04
(c) Differentiate between Gas Metal Arc Welding (GMAW) and Gas
Tungsten Arc Welding (GTAW) processes.
07
Q.5 (a) Describe the difference between Brazing and Soldering. 03
(b) Discuss the weldability and general guidelines to weld stainless
steel.
04
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2162109 Date:21/05/2019
Subject Name: Metal Joining Processes
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) What are the reasons behind welding being largely used in the
field of engineering?
03
(b) Classify and explain the flames of oxy-acetylene. 04
(c) Explain how gas-metal and slag-metal reactions take place in
welding.
07
Q.2 (a) What is weld decay? 03
(b) Write detailed classification of welding joint. 04
(c) Draw and explain CCT diagram of weldment with neat sketch. 07
OR
(c) Briefly explain Shielded Metal Arc Welding (SMAW) with a neat
sketch.
07
Q.3 (a) What is flux? Why is it essential to use it in some welding
situations?
03
(b) Explain direct current straight polarity (DCSP) and direct current
reverse polarity (DCRP)
04
(c) Explain about Atomic Hydrogen Welding with a neat sketch. 07
OR
Q.3 (a) Explain the role of inert gas in welding processes. 03
(b) Why is TIG welding preferred for welding aluminum plates? Give
reasons.
04
(c) Explain Wet Underwater Welding with a neat sketch. Give its
advantages and disadvantages.
07
Q.4 (a) Write down various steps in FSW. 03
(b) Explain the following terms with respect to characteristics of
Welding Power Sources.
1) Open circuit voltage (OCV),
2) Power factor (pf),
3) Static characteristics and
4) Dynamic characteristics.
04
(c) In a given welding operation, the power source is at 20 V and 300
amp. If the welding speed is 6 mm/s and transfer and melting
efficiency are 0.8 and 0.3, calculate the heat input.
07
OR
Q.4 (a) What is carbon equivalent? Discuss briefly how it is used in
welding industry.
03
(b) Discuss two examples of non destructive testing used in inspection
of welding defects.
04
(c) Differentiate between Gas Metal Arc Welding (GMAW) and Gas
Tungsten Arc Welding (GTAW) processes.
07
Q.5 (a) Describe the difference between Brazing and Soldering. 03
(b) Discuss the weldability and general guidelines to weld stainless
steel.
04
2
(c) List various mechanical testing methods of welded joint. Explain
any two in detail with neat schematic. Also mention their
acceptance criteria as per ASME Sec IX. Code.
07
OR
Q.5 (a) Enlist different types of electrodes used in welding processes. 03
(b) Explain the significance of WPS & PQR in welding Industries. 04
(c) When is cold cracking observed? What are the causes behind cold
cracking? Explain the remedies for the same.
07
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This post was last modified on 20 February 2020