Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech III METAL JOINING TECHNOLOGY Previous Question Paper (May - 2018 - R15)
Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks.
Part A
Give the composition of a solder alloy.
Answer
Solder alloys are primarily composed of tin (Sn) and lead (Pb). Common compositions include 60% tin and 40% lead (60/40 solder) or 63% tin and 37% lead (eutectic solder). Lead-free solders typically consist of tin combined with copper, silver, or bismuth.
Draw the lap and butt joint.
Answer
A lap joint consists of two overlapping plates joined at the edges. A butt joint consists of two plates placed in the same plane with their edges touching and joined along the seam.
What are the types of lasers used in welding?
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What are the application of PAN?
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Draw and label the typical weld joint.
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What are the uses of post weld heat treatment?
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What is meant by carbon equivalent?
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What are structural steels?
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What is meant by NDT?
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What are the remedies to avoid porosity in welds?
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Part B
Explain with neat diagram the different modes of metal transfer in MIG welding.
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Explain with neat sketch the principle and working of solder iron in soldering.
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Explain with neat sketch the plasma Arc welding. And write the advantages and limitations of plasma arc welding.
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Write short notes on diffusion welding.
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Explain the importance of pre and post weld treatments.
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Explain the micro structural changes in hypoeutectoid steels weldments.
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Explain the welding characteristics of cast irons.
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Explain the schoffler diagram in welding of stainless steels.
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Explain the causes and remedies of the following welding defects:
Cracks
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Lack of penetration.
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Explain with neat sketch, the step by step process of Dye-penetrant test.
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