NPTEL Joining Technologies for Metals Unit 3 - Week 2 PDF

Joining Technologies for metals - - Unit 3 - Week 2 https://onlinecourses-archive.nptel.ac.in/noc19... X [email protected] ▼ Course...

Joining Technologies for metals - - Unit 3 - Week 2 https://onlinecourses-archive.nptel.ac.in/noc19... X [email protected] ▼ Courses » Joining Technologies for metals Announcements Course Ask a Question Progress FAQ Unit 3 - Week 2 Register for Certification exam Assignment 2 The due date for submitting this assignment has passed. Course As per our records you have not submitted this Due on 2019-03-13, 23:59 IST. outline assignment. How to access 1) In the autogenous fusion welding of similar metals 1 point the portal Base metal and weld zone have similar microstructure Week 1 Base metal and weld zone have similar chemical composition Week 2 Solidification takes place by nucleation and growth mechanisms Lec 06 - All of above Principle of Fusion Welding No, the answer is incorrect. Processes: Gas Score: 0 Welding Accepted Answers: Lec 07 - Base metal and weld zone have similar chemical composition Fundamentals of Welding 2) The fuel gas used in gas welding which offers maximum temperature is 1 point Lec 08 - Acetylene Physics of Welding Arc Natural gas Lec 09 - Propylene Shielded Metal Hydrogen Arc Welding Lec 10 - Gas No, the answer is incorrect. Tungsten Arc Score: 0 Welding Accepted Answers: Quiz : Acetylene Assignment 2 3) In order to increase melting capability of flame during gas welding 1 point Solution for Assignment No. Tip of flame’s outer cone should be in touch with workpiece surface 2 Tip of flame’s inner cone should be in touch with workpiece surface Week 3 Tip of flame’s outer cone should be 5 mm away from the workpiece surface Week 4 Tip of flame’s outer cone should be 10 mm away from the workpiece surface © 2014 NPTEL - Privacy & Terms - Honor Code - FAQs - A project of In association with Funded by 1 of 4 Thursday 20 June 2019 05:51 PM Joining Technologies for metals - - Unit 3 - Week 2 https://onlinecourses-archive.nptel.ac.in/noc19... Week 8 DOWNLOAD VIDEOS Interaction Session Butt Lap Tee Edge No, the answer is incorrect. Score: 0 Accepted Answers: Edge 5) Which one of the following coating factor value shows heavily coated electrodes 1 point 0.8 1.1 1.7 2.1 No, the answer is incorrect. Score: 0 Accepted Answers: 2.1 6) Elements in electrode coating which improve arc stability for shielded metal arc welding are 1 point Sodium & potassium Ferro-manganese Ferro-silicon All of above No, the answer is incorrect. Score: 0 Accepted Answers: Sodium & potassium 7) In the electrode melting rate equation, MR=a.I+b.l.I^2, the term that accounts for electrical 1 point resistance heating is a.I b.l.I^2 Both a.I and b.l.I^2 There is no term which incorporates electrical resistance heating No, the answer is incorrect. 2 of 4 Thursday 20 June 2019 05:51 PM Joining Technologies for metals - - Unit 3 - Week 2 https://onlinecourses-archive.nptel.ac.in/noc19... Score: 0 Accepted Answers: b.l.I^2 8) An increase in arc gap (at same current) during gas tungsten arc welding 1 point Decreases arc voltage Increases arc voltage Increases weld bead width Both b and c No, the answer is incorrect. Score: 0 Accepted Answers: Both b and c 9) Which one the following is NOT a characteristic of gas tungsten arc welding? 1 point Clean weld Short arc length Consumable electrode Use of argon or helium for shielding No, the answer is incorrect. Score: 0 Accepted Answers: Consumable electrode 10)Compared to argon gas, the use of helium gas for shielding in GTAW process under similar 1 point conditions offers Higher arc stability Deeper penetration Lower heat input All of above No, the answer is incorrect. Score: 0 Accepted Answers: Deeper penetration Previous Page End 3 of 4 Thursday 20 June 2019 05:51 PM Joining Technologies for metals - - Unit 3 - Week 2 https://onlinecourses-archive.nptel.ac.in/noc19... 4 of 4 Thursday 20 June 2019 05:51 PM Joining Technologies for metals - - Unit 4 - Week 3 https://onlinecourses-archive.nptel.ac.in/noc19... X [email protected] ▼ Courses » Joining Technologies for metals Announcements Course Ask a Question Progress FAQ Unit 4 - Week 3 Register for Certification exam Assignment 3 The due date for submitting this assignment has passed. Course As per our records you have not submitted this Due on 2019-03-20, 23:59 IST. outline assignment. How to access 1) The function of background current in pulse GTAW is 1 point the portal Maintain the welding arc Week 1 To facilitate cooling and solidification Week 2 To fuse the substrate material Both a and b Week 3 No, the answer is incorrect. Lec 11 - Newer Score: 0 variants of Gas tungsten arc Accepted Answers: welding Both a and b Lec 12 - Gas 2) The principle mechanism involved in activated flux GTAW process includes 1 point metal arc welding Reversal of marangoni convection Lec 13 - Submerged arc Constriction of arc plasma welding Plastic deformation Lec 14 - Both a and b Electro-slag and Electro-gas No, the answer is incorrect. welding Score: 0 Lec 15 - Laser Accepted Answers: beam welding Both a and b Quiz : 3) Compared to spray transfer, the short circuit transfer requires 1 point Assignment 3 Solution for Smaller arc gap Assignment No. 3 Larger arc gap Arc gap does not matter Week 4 High welding current © 2014 NPTEL - Privacy & Terms - Honor Code - FAQs - A project of In association with Funded by 1 of 3 Thursday 20 June 2019 05:52 PM Joining Technologies for metals - - Unit 4 - Week 3 https://onlinecourses-archive.nptel.ac.in/noc19... Poweredcurrent High welding by DOWNLOAD VIDEOS High welding voltage Interaction High welding speed Session All of above No, the answer is incorrect. Score: 0 Accepted Answers: High welding current 5) Constant voltage and self-regulating arc with DCEP polarity is not suitable for 1 point Small electrode diameter Large electrode diameter Large electrode extension High electrical resistivity No, the answer is incorrect. Score: 0 Accepted Answers: Large electrode diameter 6) For given value of current and voltage, increase in electrode diameter during SAW process 1 point will lead to Wider weld bead and deeper penetration Wider weld bead and shallow penetration Narrow weld bead and deeper penetration Narrow weld bead and wider penetration No, the answer is incorrect. Score: 0 Accepted Answers: Wider weld bead and shallow penetration 7) Weld metal of submerged arc weld joint as compared to GTAW weld joint will have 1 point Coarser grain structure Finer grain structure Wider heat affected zone Both a and c No, the answer is incorrect. Score: 0 Accepted Answers: Both a and c 8) The role of copper shoes in ESW process to 1 point Restrict flow of molten metal outside Act as sink to heat generated during welding Both a and b Generate arc No, the answer is incorrect. Score: 0 2 of 3 Thursday 20 June 2019 05:52 PM Joining Technologies for metals - - Unit 4 - Week 3 https://onlinecourses-archive.nptel.ac.in/noc19... Accepted Answers: Both a and b 9) For a given Laser scanning speed, highest power density is required for 1 point Melting Alloying Heating Machining No, the answer is incorrect. Score: 0 Accepted Answers: Machining 10)Laser welding of Al and Cu alloys is found difficult due to 1 point High reflectivity High thermal conductivity Low thermal conductivity Both a and b No, the answer is incorrect. Score: 0 Accepted Answers: Both a and b Previous Page End 3 of 3 Thursday 20 June 2019 05:52 PM Joining Technologies for metals - - Unit 5 - Week 4 https://onlinecourses-archive.nptel.ac.in/noc19... X [email protected] ▼ Courses » Joining Technologies for metals Announcements Course Ask a Question Progress FAQ Unit 5 - Week 4 Register for Certification exam Assignment 4 The due date for submitting this assignment has passed. Course As per our records you have not submitted this Due on 2019-03-27, 23:59 IST. outline assignment. How to access 1) Solid-liquid based joining processes is 1 point the portal Soldering Week 1 Gas welding Week 2 Gas tungsten arc welding Gas metal arc welding Week 3 No, the answer is incorrect. Week 4 Score: 0 Lec 16 - Accepted Answers: Brazing Soldering Lec 17 - 2) Soldering/Brazing offers advantage of 1 point Soldering and braze welding Joining of metallurgically incompatible materials Lec 18 - Welding in odd positions Fundamentals of resistance Low heat input welding All of above Lec 19 - Resistance No, the answer is incorrect. welding Score: 0 processes: spot Accepted Answers: and seam welding All of above Lec 20 - Flash 3) The factor which does not affect soldering process is 1 point butt welding Clearance and orientation of sheets Quiz : Assignment 4 Melting point of base metal Solution for Cleanliness Assignment No. 4 Metallurgical compatibility of base metal and solder © 2014 NPTEL - Privacy & Terms - Honor Code - FAQs - A project of In association with Funded by 1 of 3 Thursday 20 June 2019 05:52 PM Joining Technologies for metals - - Unit 5 - Week 4 https://onlinecourses-archive.nptel.ac.in/noc19... Powered Low heat inputby Week 8 Brass filler DOWNLOAD VIDEOS No fusion of base metal No capillary action Interaction Session No, the answer is incorrect. Score: 0 Accepted Answers: No capillary action 5) Pressure is applied on electrodes in resistance spot welding to 1 point Facilitate plastic deformation Ensure firm contact Avoid sparking and arcing Both b and c No, the answer is incorrect. Score: 0 Accepted Answers: Both b and c 6) With increase in current in resistance spot welding, tensile shear load carrying capacity 1 point Increases continuously Decreases continuously Increases then decreases Decreases then increases No, the answer is incorrect. Score: 0 Accepted Answers: Increases then decreases 7) The joining process used for developing the gas tight joints 1 point Spot welding Seam welding with 10% overlap Riveting Seam welding with more than 50% overlap No, the answer is incorrect. Score: 0 Accepted Answers: Seam welding with more than 50% overlap 8) Current flows through very thin layer of the substrate surface in case of 1 point Spot welding Seam welding Continuous seam welding High frequency welding No, the answer is incorrect. Score: 0 Accepted Answers: 2 of 3 Thursday 20 June 2019 05:52 PM Joining Technologies for metals - - Unit 5 - Week 4 https://onlinecourses-archive.nptel.ac.in/noc19... High frequency welding 9) During flash butt welding, the stage in which the current supplied will be maximum and 1 point constant for longer time Preheating Flashing Upsetting Holding No, the answer is incorrect. Score: 0 Accepted Answers: Flashing 10)Displacement of workpiece during flash butt welding will be maximum during 1 point Preheating Flashing Upsetting Holding No, the answer is incorrect. Score: 0 Accepted Answers: Upsetting Previous Page End 3 of 3 Thursday 20 June 2019 05:52 PM Joining Technologies for metals - - Unit 6 - Week 5 https://onlinecourses-archive.nptel.ac.in/noc19... X [email protected] ▼ Courses » Joining Technologies for metals Announcements Course Ask a Question Progress FAQ Unit 6 - Week 5 Register for Certification exam Assignment 5 The due date for submitting this assignment has passed. Course As per our records you have not submitted this Due on 2019-04-03, 23:59 IST. outline assignment. How to access 1) Adhesive bonding can be used in joining of 1 point the portal Metal to metal Week 1 Non-metal to metal Week 2 Structural members All of above Week 3 No, the answer is incorrect. Week 4 Score: 0 Accepted Answers: Week 5 All of above Lec 21 - 2) The adhesive bonded joint configuration shown in figure is 1 point Adhesive joining Lec 22 - Weld bonding Lec 23 - Solid state joining technologies: Fundamentals Lec 24 - Ultrasonic welding Lec 25 - Diffusion welding Quiz : Cleavage Assignment 5 Tongue and groove Solution for Assignment No. Peeling 5 © 2014 NPTEL - Privacy & Terms - Honor Code - FAQs - A project of In association with Funded by 1 of 4 Thursday 20 June 2019 05:53 PM Joining Technologies for metals - - Unit 6 - Week 5 https://onlinecourses-archive.nptel.ac.in/noc19... Powered Adhesive by application, Preparation of adhesive lap joint, Spot welding DOWNLOAD VIDEOS Preparation of adhesive lap joint, Spot welding, Adhesive application Interaction Spot welding, Adhesive application, Preparation of adhesive joint Session Preparation of adhesive joint, Adhesive application, Spot welding No, the answer is incorrect. Score: 0 Accepted Answers: Adhesive application, Preparation of adhesive lap joint, Spot welding 4) Excessive increase in thickness of bond line, in general shear load carrying capacity of 1 point weld bonded joint, Increases Decreases Remains the same First decreases and then increases No, the answer is incorrect. Score: 0 Accepted Answers: Decreases 5) Metallurgically incompatible systems can be welded without buttering with 1 point Gas metal arc welding Gas welding Solid state welding Gas tungsten arc welding No, the answer is incorrect. Score: 0 Accepted Answers: Solid state welding 6) The process that uses chemical reactions of gas mixtures to heat substrate is 1 point Resistance heating Induction heating Flame heating Friction heating No, the answer is incorrect. Score: 0 Accepted Answers: Flame heating 7) The amount of energy to develop sound weld joints with ultrasonic welding depends on 1 point Thickness of the plates to be joined Creep strength of the plates to be joined Impact toughness of the plates to be joined All of above No, the answer is incorrect. Score: 0 2 of 4 Thursday 20 June 2019 05:53 PM Joining Technologies for metals - - Unit 6 - Week 5 https://onlinecourses-archive.nptel.ac.in/noc19... Accepted Answers: Thickness of the plates to be joined 8) The combination of plate thickness and hardness which can be easily welded with 1 point ultrasonic welding is Thin sheets and hard materials Thick sheets and hard materials Thin sheets and soft materials Thick sheets and soft materials No, the answer is incorrect. Score: 0 Accepted Answers: Thin sheets and soft materials 9) Metallurgical continuity between two substrates is said to be established by 1 point Holding two specimens together for 1 hour only Diffusion of atoms coupled with grain boundary formation Application of adhesives Mechanical joining of two substrates No, the answer is incorrect. Score: 0 Accepted Answers: Diffusion of atoms coupled with grain boundary formation 10)Under similar metal bonding conditions, time required for bonding will be 1 point Short at higher temperature Least at room temperature Long at higher temperature Same for all temperatures No, the answer is incorrect. Score: 0 Accepted Answers: Short at higher temperature Previous Page End 3 of 4 Thursday 20 June 2019 05:53 PM Joining Technologies for metals - - Unit 6 - Week 5 https://onlinecourses-archive.nptel.ac.in/noc19... 4 of 4 Thursday 20 June 2019 05:53 PM Joining Technologies for metals - - Unit 7 - Week 6 https://onlinecourses-archive.nptel.ac.in/noc19... X [email protected] ▼ Courses » Joining Technologies for metals Announcements Course Ask a Question Progress FAQ Unit 7 - Week 6 Register for Certification exam Assignment 6 The due date for submitting this assignment has passed. Course As per our records you have not submitted this Due on 2019-04-10, 23:59 IST. outline assignment. How to access 1) Explosive welding can be used for 1 point the portal Joining dissimilar metal combinations in lap joint configuration Week 1 Cladding purpose Week 2 Joining dissimilar metal combinations in butt joint configuration Both a and b Week 3 No, the answer is incorrect. Week 4 Score: 0 Accepted Answers: Week 5 Both a and b Week 6 2) Explosive welding involves 1 point I. One component is accelerated at high velocity towards the other Lec 26 - II. Localized micro level plastic deformation of the faying surfaces Explosive welding III. Melting of faying surfaces IV. Joining of pipes Lec 27 - Magnetic pulse welding I, II, IV Lec 28 - Weld thermal cycle I, III and IV Lec 29 - Heat I and II affected zone II, III and IV and weld thermal cycle: I No, the answer is incorrect. Lec 30 - Heat Score: 0 affected zone Accepted Answers: and weld I, II, IV thermal cycle: II 3) In magnetic pulse welding, a combination of process parameters used are 1 point Quiz : Assignment 6 Short time, high current Solution for © 2014 NPTEL - Privacy & Terms - Honor Code - FAQs - Assignment No. Short time, low current A project 6 of In association with Long time, low current Week 7 Long time, High current No, the answer is incorrect. Funded by Week 8 1 of 3 Thursday 20 June 2019 05:53 PM Joining Technologies for metals - - Unit 7 - Week 6 https://onlinecourses-archive.nptel.ac.in/noc19... Score: 0 Powered by DOWNLOAD VIDEOS Accepted Answers: Short time, high current Interaction Session 4) Magnetic pulse welding can be used to fabricate 1 point Butt joints Thick section pipe edge joints Lap joints of thin sheets All of above No, the answer is incorrect. Score: 0 Accepted Answers: Lap joints of thin sheets 5) During welding, time required to reach peak temperature will be 1 point Maximum for weld zone Minimum for weld zone Minimum for unaffected base metal Maximum for heat affected zone No, the answer is incorrect. Score: 0 Accepted Answers: Minimum for weld zone 6) Application of preheat prior to welding leads to 1 point Slower cooling rate Higher cooling rate Same cooling rate All of above No, the answer is incorrect. Score: 0 Accepted Answers: Slower cooling rate 7) With increase in deformation, strain energy stored in the deformed material will 1 point Decrease Increase Remain same Decrease then increase No, the answer is incorrect. Score: 0 Accepted Answers: Increase 8) With increase in annealing temperature and annealing time, grain size will 1 point Increase Decrease Remains constant 2 of 3 Thursday 20 June 2019 05:53 PM Joining Technologies for metals - - Unit 7 - Week 6 https://onlinecourses-archive.nptel.ac.in/noc19... Decreases to half of its original value No, the answer is incorrect. Score: 0 Accepted Answers: Increase 9) Steps involved in precipitation hardening in correct sequence are 1 point Aging, Solutionizing, Quenching Solutionizing, Quenching, Aging Aging, Quenching, Solutionizing Quenching, Solutionizing, Aging No, the answer is incorrect. Score: 0 Accepted Answers: Solutionizing, Quenching, Aging 10)In Al-Cu precipitation hardened alloys, the equilibrium phase is 1 point Theta’ (θ’) Theta’’ (θ’’) Theta (θ) GP phase No, the answer is incorrect. Score: 0 Accepted Answers: Theta (θ) Previous Page End 3 of 3 Thursday 20 June 2019 05:53 PM Joining Technologies for metals - - Unit 8 - Week 7 https://onlinecourses-archive.nptel.ac.in/noc19... X [email protected] ▼ Courses » Joining Technologies for metals Announcements Course Ask a Question Progress FAQ Unit 8 - Week 7 Register for Certification exam Assignment 7 The due date for submitting this assignment has passed. Course As per our records you have not submitted this Due on 2019-04-17, 23:59 IST. outline assignment. How to access 1) Solidification mechanism of weld metal (when base metal and filler material are dissimilar) 1 point the portal involves Week 1 Growth only Recrystallization and growth Week 2 Nucleation Week 3 Nucleation and growth Week 4 No, the answer is incorrect. Score: 0 Week 5 Accepted Answers: Nucleation and growth Week 6 2) During solidification of weld metal, grain structure obtained when equilibrium temperature 1 point Week 7 gradient is below the actual temperature gradient Lec 31 - Solidification of Planar weld metal Cellular Lec 32 - Dendritic Fundamentals of weldability of Equiaxed metals No, the answer is incorrect. Lec 33 - Score: 0 Weldability of carbon and Accepted Answers: alloys steels: Planar Fe-C, CCT 3) Weldability is influenced by 1 point Lec 34 - Weldabiliity of Process stainless steels Purpose Lec 35 - Metallurgical Fabrication condition transformations © 2014All NPTEL - Privacy & Terms - Honor Code - FAQs - of above in weld and A project heatofaffected In association with No, the answer is incorrect. zone of steels Score: 0 Quiz : Accepted Answers: Assignment 7 Funded by All of above 1 of 3 Thursday 20 June 2019 05:54 PM Joining Technologies for metals - - Unit 8 - Week 7 https://onlinecourses-archive.nptel.ac.in/noc19... Solution for 4) CleanlinessPowered of a weldbyjoint indicates 1 point Assignment No. 7 Weld joint free from impurities, inclusions, slag etc. Week 8 Dust free weld joint surface Homogeneous structure of weld joint DOWNLOAD VIDEOS Easily cleanable weld joint No, the answer is incorrect. Interaction Score: 0 Session Accepted Answers: Weld joint free from impurities, inclusions, slag etc. 5) Higher hardenability of the steel lead to 1 point Higher toughness of weld joint Higher ductility of weld joint Lower weldability Lower cracking tendency No, the answer is incorrect. Score: 0 Accepted Answers: Lower weldability 6) High cooling rate during welding of a high C steel weld joint results in 1 point Low hardness High hardness High ductility High toughness No, the answer is incorrect. Score: 0 Accepted Answers: High hardness 7) Stainless steel used for making sharp edge components (like knife, surgical items etc.) is 1 point Ferritic stainless steel Austenitic stainless steel Martensitic stainless steel Duplex stainless steel No, the answer is incorrect. Score: 0 Accepted Answers: Martensitic stainless steel 8) Generally, chromium carbide is formed in the weld joint of austenitic stainless steel at 1 point High cooling rate in weld zone Low cooling rate in weld zone High cooling rate in HAZ Low cooling rate in HAZ No, the answer is incorrect. Score: 0 2 of 3 Thursday 20 June 2019 05:54 PM Joining Technologies for metals - - Unit 8 - Week 7 https://onlinecourses-archive.nptel.ac.in/noc19... Accepted Answers: Low cooling rate in HAZ 9) Decrease in tensile strength of carbon steel having carbon percentage higher than 1 point eutectoid composition is attributed to the formation of Cementite Ferrite Pearlite Austenite No, the answer is incorrect. Score: 0 Accepted Answers: Cementite 10)During welding of medium carbon steel in annealed condition, formation of martensite takes 1 point place at Far from the fusion zone boundary Next to the fusion zone boundary Base metal All of above No, the answer is incorrect. Score: 0 Accepted Answers: Next to the fusion zone boundary Previous Page End 3 of 3 Thursday 20 June 2019 05:54 PM Joining Technologies for metals - - Unit 9 - Week 8 https://onlinecourses-archive.nptel.ac.in/noc19... X [email protected] ▼ Courses » Joining Technologies for metals Announcements Course Ask a Question Progress FAQ Unit 9 - Week 8 Register for Certification exam Assignment 8 The due date for submitting this assignment has passed. Course As per our records you have not submitted this Due on 2019-04-24, 23:59 IST. outline assignment. How to access 1) Weld joint of aluminium alloy generally shows liquation cracking in 1 point the portal Fusion zone Week 1 Region far away from fusion boundary Week 2 Partial melted zone Both fusion zone and HAZ Week 3 No, the answer is incorrect. Week 4 Score: 0 Accepted Answers: Week 5 Partial melted zone Week 6 2) Approach used to reduce the shrinkage porosity of the aluminium weld joint is 1 point Week 7 Coarsening of grain structure Improving the fluidity Week 8 Increasing the welding speed Lec 36 - Weldability of Welding in ambient condition aluminium alloys No, the answer is incorrect. Score: 0 Lec 37 - Solidification Accepted Answers: cracking and Improving the fluidity their control 3) Factor promoting the solidification cracking is 1 point Lec 38 - Residual Tensile residual stress Stresses in Weld Joints Compressive residual stress Lec 39 - Grain refinement Cracking of Welded Joints Fine precipitates I: Solidification No, the NPTEL © 2014 answer- is incorrect. Privacy & Terms - Honor Code - FAQs - and liquation Cracks Score: 0 A project of In association with Accepted Answers: Lec 40 - Cracking of Tensile residual stress Welded Joints II: Cold Cracks 4) The dihedral angle of grain whichFunded shows by less solidification cracking tendency in weld metal 1 point is 1 of 3 Thursday 20 June 2019 05:54 PM Joining Technologies for metals - - Unit 9 - Week 8 https://onlinecourses-archive.nptel.ac.in/noc19... Quiz : 0° Powered by Assignment 8 60° Solution for Assignment No. 90° 8 120° DOWNLOAD No, the answer is incorrect. VIDEOS Score: 0 Interaction Accepted Answers: Session 120° 5) Tensile residual stress generally develops in fusion weld joint at 1 point Weld metal boundary Center of the weld metal Base metal Partial refined zone No, the answer is incorrect. Score: 0 Accepted Answers: Center of the weld metal 6) Factor (s) affecting the residual stress developed in a weld joint is 1 point Degree of restraint Length of weld Weld groove design All of above No, the answer is incorrect. Score: 0 Accepted Answers: All of above 7) Less cold cracking tendency in steel weld joint is shown by 1 point Martensite Bainite Ferrite Same in all above three No, the answer is incorrect. Score: 0 Accepted Answers: Ferrite 8) The welding process which can be more problematic for liquation cracking of Al alloys 1 point Laser beam welding Electron beam welding GTAW SMAW No, the answer is incorrect. Score: 0 Accepted Answers: 2 of 3 Thursday 20 June 2019 05:54 PM Joining Technologies for metals - - Unit 9 - Week 8 https://onlinecourses-archive.nptel.ac.in/noc19... SMAW 9) High carbon steel weld joint is prone to cold cracking in 1 point Base metal Only weld metal Both weld metal and HAZ All of above No, the answer is incorrect. Score: 0 Accepted Answers: Both weld metal and HAZ 10)The Hydrogen level in SMAW weld joints can be reduced to avoid hydrogen induced 1 point cracking by Baking of electrode Low welding current Using high welding speed Welding in ambient condition No, the answer is incorrect. Score: 0 Accepted Answers: Baking of electrode Previous Page End 3 of 3 Thursday 20 June 2019 05:54 PM Joining Technologies for metals - - Unit 1 - How... https://onlinecourses-archive.nptel.ac.in/noc19... X [email protected] ▼ Courses » Joining Technologies for metals Announcements Course Ask a Question Progress FAQ Unit 1 - How to access the portal Register for Certification exam Assignment '0' Zero The due date for submitting this assignment has passed. Course As per our records you have not submitted this Due on 2019-02-25, 23:59 IST. outline assignment. How to access 1) Which one is not a joining technique? 1 point the portal Welding How to access the home Machining page? Brazing How to access the course Soldering page? No, the answer is incorrect. How to access Score: 0 the MCQ, MSQ Accepted Answers: and Programming Machining assignments? 2) Which type of welding uses gas 1 point Quiz : Assignment '0' Friction welding Zero Electron beam welding Week 1 Oxy-acetylene welding Week 2 Friction stir welding No, the answer is incorrect. Week 3 Score: 0 Week 4 Accepted Answers: Oxy-acetylene welding Week 5 3) Riveting is a 1 point Week 6 Joining technique Week 7 Casting technique Machining technique Week 8 © 2014 NPTEL - Privacy & Terms - Honor Code - FAQs - A project of In association with Funded by 1 of 2 Thursday 20 June 2019 05:50 PM Joining Technologies for metals - - Unit 1 - How... https://onlinecourses-archive.nptel.ac.in/noc19... 4) Major element in steel Powered by is 1 point Iron Ni Ti Al No, the answer is incorrect. Score: 0 Accepted Answers: Iron 5) Which property can be determined using tensile test 1 point Corrosion Impact toughness Wear Yield stress No, the answer is incorrect. Score: 0 Accepted Answers: Yield stress Previous Page End 2 of 2 Thursday 20 June 2019 05:50 PM Joining Technologies for metals - - Unit 2 - Week 1 https://onlinecourses-archive.nptel.ac.in/noc19... X [email protected] ▼ Courses » Joining Technologies for metals Announcements Course Ask a Question Progress FAQ Unit 2 - Week 1 Register for Certification exam Assignment 1 The due date for submitting this assignment has passed. Course As per our records you have not submitted this Due on 2019-03-13, 23:59 IST. outline assignment. How to access 1) Process which uses to plastic deformation for manufacturing is 1 point the portal Casting Week 1 Forming Lec 1 - Machining Introduction: Manufacturing All of these and Joining No, the answer is incorrect. Lec 02 - Score: 0 Fundamental mechanisms of Accepted Answers: Joining Forming Lec 03 - 2) Joining is 1 point Classification of Joining Zero process Processes Negative Process Lec 04 - Heat Generation in Positive Process Welding Mixed Process Lec 05 - Protection of No, the answer is incorrect. Weld Metal Score: 0 Quiz : Accepted Answers: Assignment 1 Positive Process Solution for 3) In the deformation based joining process heat generation is 1 point Assignment No. 1 Extreme Week 2 Limited No heat generation at all Week 3 Intermediate © 2014 NPTEL - Privacy & Terms - Honor Code - FAQs - A project of In association with Funded by 1 of 3 Thursday 20 June 2019 05:51 PM Joining Technologies for metals - - Unit 2 - Week 1 https://onlinecourses-archive.nptel.ac.in/noc19... Powered Increase by strength of metal the yield Week 8 Lower the yield strength of the metal DOWNLOAD VIDEOS First increase and then decrease strength No effect on the yield strength of the metal Interaction Session No, the answer is incorrect. Score: 0 Accepted Answers: Lower the yield strength of the metal 5) Process in which filler metal is not used named as 1 point Autogenous welding Fusion welding Solid state welding Resistance welding No, the answer is incorrect. Score: 0 Accepted Answers: Autogenous welding 6) Welding process in which molten metal is prepared outside and then it is fed between the 1 point faying surfaces is Arc welding Electro slag welding Thermite welding Laser welding No, the answer is incorrect. Score: 0 Accepted Answers: Thermite welding 7) High energy density welding process associated with 1 point Low heat input High heat input No heat input No relation with heat input No, the answer is incorrect. Score: 0 Accepted Answers: Low heat input 8) Chemical reaction approach is used as a source of heat in 1 point Electro slag welding Tungsten inert gas welding Thermite welding All of these No, the answer is incorrect. Score: 0 2 of 3 Thursday 20 June 2019 05:51 PM Joining Technologies for metals - - Unit 2 - Week 1 https://onlinecourses-archive.nptel.ac.in/noc19... Accepted Answers: Thermite welding 9) Porosity in the weld metal caused due to 1 point High solubility of the gases in liquid and solid state Low solubility of the gases in liquid and solid state Equal solubility of the gases in the liquid and solid state High difference in the solubility of the gases in the liquid and solid state No, the answer is incorrect. Score: 0 Accepted Answers: High difference in the solubility of the gases in the liquid and solid state 10)The approach used for protecting the arc in submerged arc welding is 1 point Shielding gas like Helium or Argon Molten granular flux Mixture of Helium and Argon gas in definite proportion Inactive shielding gas No, the answer is incorrect. Score: 0 Accepted Answers: Molten granular flux Previous Page End 3 of 3 Thursday 20 June 2019 05:51 PM