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Posted Date: 14 Aug 2008 Posted By: Sunil Reddy Member Level: Platinum
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2008 Jawaharlal Nehru Technological University Metallurgy & Material Technology III B.Tech I Semester Supplimentary Examinations, February 2008 , WELDING METALLURGY Question paper
Code No: R05311805 Set No. 2
III B.Tech I Semester Supplimentary Examinations, February 2008
WELDING METALLURGY
(Metallurgy & Material Technology)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Explain the variables affecting the strength of a weld joint.
(b) Explain the characteristics of Butt joints. [8+8]
2. Write short notes on:
(a) Metallurgical effects of heat flow in welding
(b) Heat flow in fillet welds [8+8]
3. (a) What are the advantages and limitations of standard MIG process over mag-
netic flux MIG process?
(b) Give the important applications of plasma torches? [8+8]
4. (a) What are the variables encountered in spot welding?
(b) Explain diffusion bonding and give the important applications of diffusion
welding? [8+8]
5. (a) Give the causes of porosity in the deposit, when hard facing is carried out on
low carbon steel?
(b) How does the welding of high carbon steels differ from that of medium and
low carbon steels? Explain. [10+6]
6. (a) Differentiate semi-automatic welding of aluminum with machine welding?
(b) What are the different solid state welding processes used for joining aluminum
alloys? [8+8]
7. (a) What are the causes and remedies for stress corrosion cracking in the welding
of austenitic stainless steels?
(b) What are the factors which promote hot cracking in weldments? [8+8]
8. (a) What are the advantages of furnace brazing over other methods of brazing?
(b) What are the furnaces used for brazing purposes?
(c) Explain infrared brazing process?
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