1|Page
CWB WELDING INSPECTOR LEVEL 2 EXAM NEWEST
ACTUAL EXAM COMPLETE 200 QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+|| LATEST EXAM
VERSION!!!
What is the description of damage of a brittle fracture? -
Answer-Sudden rapid fracture under stress (residual or
applied) where material exhibits little or no evidence of
ductility or plastic deformation
What type of Steel are of primary concern with brittle
fractures? - Answer-Carbon and low alloy steels. 400
series SS are also susceptible
What has a significant influence on toughness and
resistance to brittle fractures? - Answer-Steel cleanliness
and grain size
In most cases brittle fractures occur only at what
temperature? - Answer-Below the charpy impact transition
temperature.(or ductile-to-brittle transition temperature)
The point at which the toughness of the material drops off
sharply
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What kind of equipment or units can be affected for brittle
fractures? - Answer-*Can occur during ambient
temperature hydro testing due to high stresses and low
toughness at the testing temperature
*Most processes run at elevated temperature so the main
concern is during startup, shutdown, or hydro/tightening
testing.
What is the appearance of a brittle fracture? - Answer-
Typically appear straight, non branching, and largely
devoid of any associated plastic deformation. (Although
fine shear lips may be found along free adge of the
fracture or localized necking around neck of crack.
What is thermal fatigue a result of ? - Answer-Cyclic
Stress caused by variations in temperature.
In thermal fatigue damage occurs as cracking, where may
this occur? - Answer-Can occur anywhere in a metallic
component where relative movement or differential
expansion is constrained. Particularly under repeated
thermal cycling.
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What type of material can thermal fatigue happen on? -
Answer-All material of construction.
What are a couple but not all critical factors for thermal
fatigue? - Answer-*Key factors affecting thermal fatigue
are the magnitude of the temperature swing and the
frequency (number of cycles)
*Damage is also prompted by rapid changes in surface
temperature that results in thermal gradient through the
thickness or along the length of a component.
What are some affected units or equipment of thermal
fatigue? - Answer-*Major problem in coke drum shells
*another example is the mix point of hot/cold streams such
as hydrogen mix points in hydroprocessing units.
*locations where condensate comes in contact with steam
systems such as de-superheating or attemporating
equipment
What is the appearance of a thermal fatigue crack? -
Answer-*Usually initiates on the surface. Generally wide
and often filled with oxides due to elevated temperature
exposure. *May occur as single or multiple cracks
CWB WELDING INSPECTOR LEVEL 2 EXAM NEWEST
ACTUAL EXAM COMPLETE 200 QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+|| LATEST EXAM
VERSION!!!
What is the description of damage of a brittle fracture? -
Answer-Sudden rapid fracture under stress (residual or
applied) where material exhibits little or no evidence of
ductility or plastic deformation
What type of Steel are of primary concern with brittle
fractures? - Answer-Carbon and low alloy steels. 400
series SS are also susceptible
What has a significant influence on toughness and
resistance to brittle fractures? - Answer-Steel cleanliness
and grain size
In most cases brittle fractures occur only at what
temperature? - Answer-Below the charpy impact transition
temperature.(or ductile-to-brittle transition temperature)
The point at which the toughness of the material drops off
sharply
,2|Page
What kind of equipment or units can be affected for brittle
fractures? - Answer-*Can occur during ambient
temperature hydro testing due to high stresses and low
toughness at the testing temperature
*Most processes run at elevated temperature so the main
concern is during startup, shutdown, or hydro/tightening
testing.
What is the appearance of a brittle fracture? - Answer-
Typically appear straight, non branching, and largely
devoid of any associated plastic deformation. (Although
fine shear lips may be found along free adge of the
fracture or localized necking around neck of crack.
What is thermal fatigue a result of ? - Answer-Cyclic
Stress caused by variations in temperature.
In thermal fatigue damage occurs as cracking, where may
this occur? - Answer-Can occur anywhere in a metallic
component where relative movement or differential
expansion is constrained. Particularly under repeated
thermal cycling.
, 3|Page
What type of material can thermal fatigue happen on? -
Answer-All material of construction.
What are a couple but not all critical factors for thermal
fatigue? - Answer-*Key factors affecting thermal fatigue
are the magnitude of the temperature swing and the
frequency (number of cycles)
*Damage is also prompted by rapid changes in surface
temperature that results in thermal gradient through the
thickness or along the length of a component.
What are some affected units or equipment of thermal
fatigue? - Answer-*Major problem in coke drum shells
*another example is the mix point of hot/cold streams such
as hydrogen mix points in hydroprocessing units.
*locations where condensate comes in contact with steam
systems such as de-superheating or attemporating
equipment
What is the appearance of a thermal fatigue crack? -
Answer-*Usually initiates on the surface. Generally wide
and often filled with oxides due to elevated temperature
exposure. *May occur as single or multiple cracks
