CWB 2 VISUAL WELD INSPECTOR EXAM - COMPLETE QUESTIONS AND DETAILED SOLUTIONS
LATEST UPDATE THIS YEAR JUST RELEASED
Question 1: Welding codes normally require a waiting period
between welding and inspection because
Answer:
hydrogen induced cracks (HICC) may occur several hours after the weld
has solidified
Question 2: What is the main reason for pre-heating
Answer:
to reduce the hydrogen content of the weld by diffusion
Question 3: The tekkan test is suitable to study crack susceptibility
in a
Answer:
Groove weld
Question 4: Lamellar tearing is most likely to occur in which of the
following
Answer:
thick T-groove welds
Question 5: During welding, the proportion of heat energy that
enters the plate is referred to as its efficiency. What is the
efficiency dependent on
Answer:
The welding process
,Question 6: When the alloy content of a structural steel us
sufficiently high that HAZ hardness cannot be controlled
Answer:
The only remaining factor which can be controlled is hydrogen content
Question 7: In arc welding, the area of the base metal adjacent to
the fusion line which is not melted is called
Answer:
The Heat Affected Zone
Question 8: Process that are not hydrogen controlled may require
Answer:
Higher preheat temperatures for thicker plates
Question 9: What joints provide the most dilution
Answer:
The square groove weld with zero root opening
Question 10: what electrode type is often required if stress
relieving operation are planned on the fabricated structure to
maintain the same yield strength and tensile strength
Answer:
Molybdenum-bearing electrodes
Question 11: The type of microstructure and susceptibility to
cracking of a heat affected zone depends on
Answer:
Hardenability of the steel and the weld cooling rate
,Question 12: The level of preheat required is typically derived from
the
Answer:
plate thickness and the carbon content of the steel
Question 13: Submerged arc welding has a process efficiency of
Answer:
90% to 99%
Question 14: Covered electrodes that use basic coatings
Answer:
Reduce electrodes that use basic coatings
Question 15: The extent to which grain growth in HAZ occurs
depends on
Answer:
The energy input
Question 16: For given set of welding parameters, an increase in
travel speed will
Answer:
Decrease the heat input
Question 17: Why is it possible for some multipass welds to have
higher toughness than a single pass weld
Answer:
The passes in the multipass weld refine the underlying grain structure
, Question 18: The amount of dilution of weld metal by the parent
metal
Answer:
is mostly dependent on the joint design and welding process
Question 19: Restraint is usually higher in
Answer:
Groove welds than in fillet welds
Question 20: The G-BOP test is suitable to study crack
susceptibility relating to
Answer:
Hydrogen -cracking in the heat affected zone
Question 21: What is the heat input efficiency of the SMAW process
Answer:
50 - 85
Question 22: In some steels a very slow cooling rate may
procedure a
Answer:
soft, coarse grain structure with low toughness
Question 23: Sometimes an unwanted microstructure can be
refined and altered by reheating
Answer:
Into normalizing range, where it will re-crystalize and transform back into
small austenite grains
LATEST UPDATE THIS YEAR JUST RELEASED
Question 1: Welding codes normally require a waiting period
between welding and inspection because
Answer:
hydrogen induced cracks (HICC) may occur several hours after the weld
has solidified
Question 2: What is the main reason for pre-heating
Answer:
to reduce the hydrogen content of the weld by diffusion
Question 3: The tekkan test is suitable to study crack susceptibility
in a
Answer:
Groove weld
Question 4: Lamellar tearing is most likely to occur in which of the
following
Answer:
thick T-groove welds
Question 5: During welding, the proportion of heat energy that
enters the plate is referred to as its efficiency. What is the
efficiency dependent on
Answer:
The welding process
,Question 6: When the alloy content of a structural steel us
sufficiently high that HAZ hardness cannot be controlled
Answer:
The only remaining factor which can be controlled is hydrogen content
Question 7: In arc welding, the area of the base metal adjacent to
the fusion line which is not melted is called
Answer:
The Heat Affected Zone
Question 8: Process that are not hydrogen controlled may require
Answer:
Higher preheat temperatures for thicker plates
Question 9: What joints provide the most dilution
Answer:
The square groove weld with zero root opening
Question 10: what electrode type is often required if stress
relieving operation are planned on the fabricated structure to
maintain the same yield strength and tensile strength
Answer:
Molybdenum-bearing electrodes
Question 11: The type of microstructure and susceptibility to
cracking of a heat affected zone depends on
Answer:
Hardenability of the steel and the weld cooling rate
,Question 12: The level of preheat required is typically derived from
the
Answer:
plate thickness and the carbon content of the steel
Question 13: Submerged arc welding has a process efficiency of
Answer:
90% to 99%
Question 14: Covered electrodes that use basic coatings
Answer:
Reduce electrodes that use basic coatings
Question 15: The extent to which grain growth in HAZ occurs
depends on
Answer:
The energy input
Question 16: For given set of welding parameters, an increase in
travel speed will
Answer:
Decrease the heat input
Question 17: Why is it possible for some multipass welds to have
higher toughness than a single pass weld
Answer:
The passes in the multipass weld refine the underlying grain structure
, Question 18: The amount of dilution of weld metal by the parent
metal
Answer:
is mostly dependent on the joint design and welding process
Question 19: Restraint is usually higher in
Answer:
Groove welds than in fillet welds
Question 20: The G-BOP test is suitable to study crack
susceptibility relating to
Answer:
Hydrogen -cracking in the heat affected zone
Question 21: What is the heat input efficiency of the SMAW process
Answer:
50 - 85
Question 22: In some steels a very slow cooling rate may
procedure a
Answer:
soft, coarse grain structure with low toughness
Question 23: Sometimes an unwanted microstructure can be
refined and altered by reheating
Answer:
Into normalizing range, where it will re-crystalize and transform back into
small austenite grains
