09A51806 Welding Technology B.Tech Question Paper : sphoorthyengg.com
Name of the College : Sphoorthy Engineering College
University : JNTUH
Department : Metallurgy And Material Technology
Subject Code/Name : 09A51806/WELDING TECHNOLOGY
Year : December 2011
Degree : B.Tech
Year/Sem : III/I
Website : sphoorthyengg.com
Document Type : Model Question Paper
Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/sphoorthyengg.com/4811-09A51806-WELDINGTECHNOLOGY.pdf
Welding Technology Question Paper :
III B.Tech I Semester Examinations,December 2011
Time: 3 hours
Max Marks: 75
Related : Sphoorthy Engineering College 09A51802 Nonferrous Extractive Metallurgy B.Tech Question Paper : www.pdfquestion.in/4819.html
Answer any FIVE Questions :
All Questions carry equal marks :
1. (a) Explain the following:
i. Hard soldering
ii. Soft soldering.
(b) Explain with neat diagram the torch method of soldering? [8+7]
2. Write short notes on the following weld defects.
(a) Porosity
(b) Under cutting
(c) Cracks. [15]
3. (a) Why is cleaning of metal is important for successful welding? Explain?
(b) Describe the metallurgical effects in resistance welding cycle? [7+8]
4. Describe the process of welding gray cast iron using manual metal arc welding? [15]
5. Write short notes on the following:
(a) Shielding gas in arc welding.
(b) Fluxes in arc welding. [15]
6. (a) Explain the concept of dilution particularly in fusion welding of dissimilar metals?
(b) What are the different methods to control dilution? Explain. [7+8]
7. (a) What is nugget? How the size of the resistance spot weld is determined?
(b) How does the spot welding differ from roll spot welding and projection welding? [7+8]
8. (a) Explain the effect of fast and slow cooling on micro structure of low carbon steel weld metal?
(b) Why is it that residual stress tends to become less of a problem that faster you are able to complete an arc welded joint? [7+8]
Code No: 09A51806
R09 Set No. 4
1. (a) Explain the different types of welding electrodes used in arc welding process?
(b) Explain the function of electrode coating? [7+8]
2. (a) How does the weld ability of steel changes as the steel carbon content increases? Why?
(b) Explain the factors responsible for high quality welds in welding stainless steels? [7+8]
3. Explain in detail the causes and remedies for over lapping in welds? [15]
4. On what factors do the strength and other mechanical properties of joint affects in adhesive bonding? [15]
5. What are the causes and effect of stresses in welds? How do you control these stresses? [15]
6. (a) Explain the type of electrode materials used in TIG?
(b) Describe the flux materials used in TIG welding? [7+8]
7. Describe the different diffusion welding methods? [15]
8. Explain in detail the types of flames and flux required for gas welding of copper and its alloys?
III B.Tech I Semester Examinations,December 2011 :
Welding Technology :
1. Explain the following welding residual stresses.
(a) Mechanical residual stress.
(b) Metallurgical residual stress.
(c) Reaction residual stress. [15]
2. (a) Explain the constituents of electrode coating with their functions?
(b) What are the disadvantages of using bare electrodes? [7+8]
3. Explain the factors for the formation of the following weld defects and give remedies:
(a) Cracks
(b) Poor weld bead appearance. [15]
4. (a) How does the welding of high carbon steels differ from that of medium carbon steels and low carbon steels? Explain.
(b) Explain the welding characteristics of high alloyed steels? [7+8]
5. Write short notes on the following:
(a) Infra red brazing
(b) Resistance brazing
(c) Carbon-arc brazing. [7+8]
6. What are the process employed for welding Al and its alloys? Explain any two of them? [15]
7. (a) Explain the electrode geometry in TIG welding?
(b) Name the shielding gas and uses for the following metals for TIG welding?
i. Stainless steel
ii. Bronzes and
iii. Ti and Mg
(c) Explain how the tungsten contamination in weld is minimized? [15]
8. (a) Can ordinary light be used instead of laser in laser welding? Explain
(b) What precautions should be taken for welding high reflective materials using laser welding?
(c) Whether welding of plastics are possible by laser welding? Explain.