Roll No. ...................... Total No. of Questions: 08]

[Total No. of Pages: 02

..

M.Tech. WELDING TECHNOLOGY SUBJECT CODE: PE - 504

Paper ID : [E0444] INote : Please fill subject co'de and paper ID onOMRI

Time: 03 Hours Instruction 1) 2)

Ql) (a)

Maximum Marks:

100

to Candidates:

Attempt any Five questions. All questions carry equal marks.

What is welding? Describe the solidification mechanism occurred in fusion ofweldments?

(b) Explain the effects of alloying of various elements on welding of carbon alloy steel? Q2) Define welding arc? Explain the mechanism of arc initiation and its maintenance?

Q3) (a) What is arc blow? Describe in brief the factor which causes the arc blow? (b)

Why coating of electrode is necessary? What are the different types of coating? Explain in brief.

Q4) How GTAWand GMA W differentiated from each other on the basis of process, parameters, equipments, uses and applications? Q5) What are the requirements of an electric arc welding power source? Describe in brief the A.C. welding power sources with the help of suitable sketches?

J -40 18{812 9J

P.T.O.

Q6) . Explai~ the various forces affecting the transfer of material in welding? Also describe in brief the different modes of metal transfer in welding?

Q 7) (a) Explain the theory and mechanisl~ of solid stat~welding with the help of suitable diagrams? (b)

What is the scope and applications of laser beam welding?

Q8) Write sho~ note on any two of the following: (a) Metallurgical changes occurred in weld metal (b) Ultrasonic welding (c) DC rectifiers

<'r<'r<'r<'r

J -4018

2

GNDEC M.Tech PE December 2009 Welding Technology.pdf ...

Describe the solidification mechanism occurred in fusion. ofweldments? (b) Explain the effects of alloying of various elements on welding of carbon. alloy steel? Q2) Define welding arc? Explain the mechanism of arc initiation and itsmaintenance? Q3) (a) What is arc blow? Describe in brief the factor which causes the arc.

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