Metal Joining & Powder Metallurgy B.E Question Paper : jaduniv.edu.in
Name of the University : Jadavpur University
Department : Metallurgical Engineering
Degree : B.E
Subject Name : Metal Joining And Powder Metallurgy
Year/Sem : IV/II
Website : jaduniv.edu.in
Document Type : Model Question Paper
Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/dspace.jdvu.ac.in/5456-Metal%20joining%20and%20power%20Metallugy.pdf
Metal Joining & Powder Metallurgy Question :
Bachelor Of Metallurgical Engg. Examination 2009 :
(4th Year, 2nd Semester)
Time : Three hours
Related : Jadavpur University Metal Working Process B.E Question Paper : www.pdfquestion.in/5455.html
Full Marks : 100
(50 marks for each part)
Use a separate Answer-Script for each part. :
PART–I :
Answer Question No. 1 and any two from the rest. :
1. State whether the following statements are true (T). or false (F) and explain why ? 20
a) Among the arc welding processes, GTAW process gives best weld quality.
b) The groove angle for stainless steel can be narrow compared to mild steel.
c) Most GMAW is performed with DCRP for deep penetration.
d) For welding of aluminium using GTAW process, AC is preferred.
e) Micro-segregation is more pronounced in welding than casting.
f) Basic coated electrodes are preferred for low hydrogen and low sulphur content in weld metal.
g) Soldering is extensively used in Electronic industries.
h) Flux related process always enjoys some merits.
i) Laser beam welding is less efficient than conventional arc welding process.
j) Free energy formation of any metal oxide provides reliable information for producing defect free weld.
2. Why drooping type power source characteristics is preferred for MMAW process and flat type is preferred for GMAW process ? What do you mean by ‘Duty Cycle’? How with you make a continuous welding with a power source whose duty cycles is 60% at rated current of 300 amps? Inverter type of power source is the order of the day – comment. 15
3. Discuss how one can establish weld procedure for a given steel using fusion welding process without trial and error. How technical characteristics of laser weld differ from conventional arc weld? State the merits & demerits between between CO2 laser and YAG laser. 15
4. Why solid-state welding is preferred over fusion welding in case of dissimilar metals & alloys? Why a threshold deformation is required before the joints develop any strength? Discuss a suitable method of Joining Aluminium based metal matrix composite.
Why the inclusion content is considered as one of the major factors controlling the microstructure of weld metal. Now a days, HAZ crcecking due to hydrogen is less severe than weld metal cracking– explain. Discuss the possible ways of minimizing hydrogen induced cracking. 15
PART–II :
Answer Question No. 6 and any two from the rest. :
6. Answer any four of the following. :
a) Most metals and alloys can be processed using the melting and casting route, but we do not prefer to apply this method for the processing of specific metals (e.g.w) and most ceramics. Explain.
b) What is meant by liquid phase sintering? How does the liquid phase form? What happens to the liquid phase after sintering is completed ?
c) What are hot pressing arc hot isostatic pressing ? Mention the specific advantages of using them compared to using normal sintering ?
d) What is CERATIZIT ? What does it do?
e) List the common methods of particle size determination and their limits of applicability.
f) Give three major attributes of powder metallurgy processing.
g) Discuss the role of powder metallurgy in nuclear applications. 5×4 =20
Syllabus :
Metal Joining And Powder Metallurgy :
Fundamental of bonding, Welding arc and arc physics, Power sources for arc welding, Arc welding processes, High power density welding processes (EB, LBW, PAW), Resistance welding processes
Solid-state welding-Friction-stir welding, Welding Metallurgy and weldability of Ferrous and Nonferrous Metals & alloys, Brazing, Soldering and Adhesive bonding, Brazability and Solderability of metals and alloys
Defects in welded, brazed and soldered joints and its significance, Destructive and Non-destructive testing of welded joints, Weldability test.
Powder Metallurgy : Powder production methods, powder characterization, compaction, sintering and relevant theories, application of powder metallurgy, a few typical powder-metallurgy products.