Download GTU BE/B.Tech 2019 Winter 6th Sem New 2162109 Metal Joining Processes Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER- VI (New) EXAMINATION - WINTER 2019

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Subject Code: 2162109

Subject Name: Metal Joining Processes

Time: 02:30 PM TO 05:00 PM

Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1

1. Give Definition of welding as per IS and AWS. [03]
2. Classify welding processes and its allied processes. [04]

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3. Explain with schematic different mode of metal transfer in arc welding processes. [07]

Q.2

1. What are the welding codes for weld positions? [03]
2. Illustrate with figure Frictional Stir welding process. [04]
3. Explain with reason which arc characteristics should be used for the following welding Process.(CC, CV, Self-regulating Arc):- a. MMA & TIG b. MIG, SAW & PAW [07]

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OR

1. By cyclic diagram, how arc is to be initiated in arc welding? Explain [03]
2. What is the formula for welding heat input? [04]
3. What is duty cycle? Current rating for a welding power source is 400 A at 60% duty cycle. Determine the welding current for automatic continuous welding i.e. 100% duty cycle. [07]

Q.3

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1. Explain the Coding Method of SMAW'Electrode with suitable example. [03]
2. What are OCV and SSC in arc welding processes? [04]
3. Differentiate Soldering and Brazing. [07]

OR

1. Explain the zones in arc gap of a welding arc with schematic figure. [03]

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2. State types of polarity used in welding with its significance. [04]
3. Write short note on’Flux cored electrode wire. [07]

Q.4

1. Write a short note on SAW. [03]
2. What do you mean by dilution in welding? [04]

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3. Explain in brief about weldability of Al-alloy & Ti-alloys. [07]

OR

1. Briefly explain about Electro slag welding process. [03]
2. What is brazing process? Give different brazing materials [04]
3. How does hydrogen embrittlement occur? [07]

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Q.5

1. With schematic diagram explain in detail GTAW process. [03]
2. What is carbon equivalent? Discuss briefly how it is used in Welding industry. [04]
3. What is the significance of WPS & PQR in welding Industries? [07]

OR

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1. List various Mechanical Tastings of welded joint. Explain any TWO in detail with neat schematic. Also mention their acceptance criteria as per ASME Sec IX Code. [07]

Date: 12/12/2019

Total Marks: 70