28/07/2020 Fundamentals of manufacturing processes - - Unit 12 - Week 11
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Lecture 51:
Weldability and welding defects
Due on 2019-10-16, 23:59 IST.
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1 point 2)
1 point 3)
Assignment No. 11
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Simple carbon equivalent equation for low alloy steel = C + (Mn)/6 + (...+ Mo)/... + (Ni +…)/15 Co, 5, Cu
Cr,15, Co Cu, 15, Cr Cr, 5, Cu
No, the answer is incorrect.
Score: 0
Accepted Answers:
Cr, 5, Cu
A type of cracking also known as delayed cracking is Solidification cracking
Liquation cracking
Hydrogen-induced cracking Underbead cracking No, the answer is incorrect.
Score: 0
Accepted Answers:
Hydrogen-induced cracking
Coarse grains in cast components are found generally (without any grain refinement procedure)
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Week 12
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Text Transcripts (unit?
unit=75&lesson=76) Lecture 52: Heat treatment:
Fundamentals (unit?
unit=75&lesson=77) Lecture 53: Heat treatment:
Fundamentals II (unit?
unit=75&lesson=78) Lecture 54: Heat treatment:
Fundamentals III (unit?
unit=75&lesson=79) Lecture 55: Heat treatment:
Normalizing and hardening (unit?
unit=75&lesson=80) Quiz :
Assignment No. 11 (assessment?
name=111) Solution for Assignment No.
11 (unit?
unit=75&lesson=132)
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1 point 5)
1 point 6)
1 point 7)
1 point 8)
At boundary At the centre
At centre and boundary
Neither at centre nor at boundary No, the answer is incorrect.
Score: 0
Accepted Answers:
At the centre
On strain hardening of steel
Strength & hardness increases while toughness & ductility decreases Strength increases while toughness, hardness & ductility decreases Strength,hardness & toughness increases while ductility decreases Strength & ductility increases while toughness & hardness decreases No, the answer is incorrect.
Score: 0
Accepted Answers:
Strength & hardness increases while toughness & ductility decreases
The upper critical temperature and lower critical temperature for 0.8% Carbon steel are 1325°C & 910°C respectively
910°C & 910°C respectively 910°C & 730°C respectively 730°C & 730°C respectively No, the answer is incorrect.
Score: 0
Accepted Answers:
730°C & 730°C respectively
At room temperature, eutectoid steel in annealed condition exhibits Perlite only
Ferrite only
Ferrite + perlite both Perlite + Cementite both No, the answer is incorrect.
Score: 0
Accepted Answers:
Perlite only
In TTT diagram of eutectoid steel, with an increase in homogeneity during austenitizing Nose of curve is shifted towards left, critical cooling rate increases
Nose of curve is shifted towards right, critical cooling rate reduces No shifting of nose of curve only critical cooling rate increases No shifting of nose of curve only critical cooling rate reduces No, the answer is incorrect.
Score: 0
Accepted Answers:
Nose of curve is shifted towards right, critical cooling rate reduces
For Normalizing heat treatment of low carbon steels, cooling of the steel from austenitized condition is carried out in
28/07/2020 Fundamentals of manufacturing processes - - Unit 12 - Week 11
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1 point 9)
1 point 10)
Water Furnace Air Oil
No, the answer is incorrect.
Score: 0
Accepted Answers:
Air
In Shallow hardening of hardenable steel
Tensile residual stress is generated at surface & Compressive residual stress is generated at core Compressive residual stress is generated both at surface & core
Tensile residual stress is generated both at surface & core
Compressive residual stress is generated at surface & Tensile residual stress is generated at core No, the answer is incorrect.
Score: 0
Accepted Answers:
Compressive residual stress is generated at surface & Tensile residual stress is generated at core
Choose the correct option in the context of solidification cracking in weld joints Solidification cracking occurs in HAZ
Small solidification temperature range promotes solidification cracking Solidification cracking increases with residual stresses
Restraints should be increased to reduce solidification cracking No, the answer is incorrect.
Score: 0
Accepted Answers:
Solidification cracking increases with residual stresses
