CWB 2 VISUAL WELD INSPECTOR EXAM 2026
WITH QUESTIONS AND ANSWERS
Which two elements are deliberately added in free machining steels -
ANSWER-Sulphur and Lead
What is the melting point of steel - ANSWER-1500 C
Why are small amounts of nickel added to structural steels - ANSWER-Increase
toughness at low temperatures
During the smelting of iron " reduction" refers to removing - ANSWER-oxygen
from the ore
Reducing grain size will increase the - ANSWER-strength and toughness of the
carbon steel
What is tempering - ANSWER-reheating a steel to a temperature below 723 C
and allowing entrapped carbon in the martensite to form small carbides
What is the most common method of steel making - ANSWER-Continuous
casting
What designates that AISI 4340 refers to Nickel-Chromium-molybdenum steel -
ANSWER-First two digits
In rolled plate intended for a pressure vessel use, less ductility will be expected
- ANSWER-across the direction of rolling ( transverse to rolling)
,In rolled plate intended for a pressure vessel use, more ductility will be expected
- ANSWER-Parallel to rolling (longitudinal to rolling)
When inspecting welds using magnetic particle testing, what is the most
common way to induce the magnetic field when using direct or alternating
current - ANSWER-Portable yoke
What type of current is used to detect subsurface defects when using magnetic
particle test - ANSWER-Direct current (DC)
Magnetic particle testing can be used in all positions, including overhead -
ANSWER-TRUE
why is it necessary to clean the weld zone surface with a solvent to remove
grease and dirt - ANSWER-The penetrant cannot enter cavity if it is plugged
with foreign material
After penetrant is applied and the dwell time is complete it is necessary to
remove the surface penetrant. What are the two methods - ANSWER-Fine water
spray or solvent remover
Some specifications limit halogen content in penetrant test materials because
under certain conditions they can cause (blank) in austenitic stainless steel -
ANSWER-stress corrosion cracking
When using penetrants on welds that have not been dressed, care must be taken
in cleaning the surplus penetrant out of the ripples. Why - ANSWER-There will
be confusion when attempting to interpret the test results
Ultrasonic testing of welds utilizes sound frequencies between (Blank) and
(Blank) - ANSWER-2.5 MHZ and 5 MHZ
,When a change occurs in the material (such as void caused by a defect) the
velocity of the ultrasonic beam changes and what is known as - ANSWER-
Acoustic mismatch
Ultrasonic sound waves are generated by applying electric pulses to (Blank)
crystals - ANSWER-Piezoelectric
What is surface tension - ANSWER-Makes liquid to try to reduce surface area
while in a free state
Which way do flux line go - ANSWER-north to south south to north
The property of liquids that makes them try to reduce their surface area is know
as - ANSWER-Surface Tension
The ability of liquid to wet a solid surface can be measured in terms by -
ANSWER-contact angle
Fluorescent dye be view - ANSWER-Black light
Which of penetrants require treatment with a separate agent before the excess
can be removed - ANSWER-post-emulsifiable, post-remover
What type of developer is normally used with the solvent-removal process to
spot check welds - ANSWER-Non-aqueous
Most common type of LPI for highly sensitive applications such as fatigue
cracks - ANSWER-Fluorescent post-emulsified penetrant process
, When using LPI what shouldn't you do - ANSWER-Use grinder. It can flow the
surface and conceal cracks
When using the solvent-removable method, why should the solvent not be
sprayed directly on the surface to remove excess penetrant - ANSWER-It may
leach penetrant out of discontinuities
When using post-emulsifiable penetrants, the emulsifier must remain in contact
with the surface long enough to - ANSWER-Mix with the excess penetrant but
not long to reach penetrant in the discontinuities
What could be the effect of spraying on too much developer - ANSWER-It
could mask indications
What is the difference between a false indication and a non-relevant indication -
ANSWER-False indications are not associated with discontinuities. Nonrelevant
indications are associated with discontinuities
What causes false indications - ANSWER-Poor cleaning
What indication is most likely caused by a crack - ANSWER-Continuous line
What is most likely caused by porosity - ANSWER-Rounded
If a small crack is found by LPI in an aluminum weld - ANSWER-it may not be
repaired by simply welding over it to melt out the crack, retained penetrant
could contaminate the repair. The metal containing the crack must be removed
before repair
The local magnetic field across a crack in a magnetized piece of steel is known
as - ANSWER-Flux Leakage
WITH QUESTIONS AND ANSWERS
Which two elements are deliberately added in free machining steels -
ANSWER-Sulphur and Lead
What is the melting point of steel - ANSWER-1500 C
Why are small amounts of nickel added to structural steels - ANSWER-Increase
toughness at low temperatures
During the smelting of iron " reduction" refers to removing - ANSWER-oxygen
from the ore
Reducing grain size will increase the - ANSWER-strength and toughness of the
carbon steel
What is tempering - ANSWER-reheating a steel to a temperature below 723 C
and allowing entrapped carbon in the martensite to form small carbides
What is the most common method of steel making - ANSWER-Continuous
casting
What designates that AISI 4340 refers to Nickel-Chromium-molybdenum steel -
ANSWER-First two digits
In rolled plate intended for a pressure vessel use, less ductility will be expected
- ANSWER-across the direction of rolling ( transverse to rolling)
,In rolled plate intended for a pressure vessel use, more ductility will be expected
- ANSWER-Parallel to rolling (longitudinal to rolling)
When inspecting welds using magnetic particle testing, what is the most
common way to induce the magnetic field when using direct or alternating
current - ANSWER-Portable yoke
What type of current is used to detect subsurface defects when using magnetic
particle test - ANSWER-Direct current (DC)
Magnetic particle testing can be used in all positions, including overhead -
ANSWER-TRUE
why is it necessary to clean the weld zone surface with a solvent to remove
grease and dirt - ANSWER-The penetrant cannot enter cavity if it is plugged
with foreign material
After penetrant is applied and the dwell time is complete it is necessary to
remove the surface penetrant. What are the two methods - ANSWER-Fine water
spray or solvent remover
Some specifications limit halogen content in penetrant test materials because
under certain conditions they can cause (blank) in austenitic stainless steel -
ANSWER-stress corrosion cracking
When using penetrants on welds that have not been dressed, care must be taken
in cleaning the surplus penetrant out of the ripples. Why - ANSWER-There will
be confusion when attempting to interpret the test results
Ultrasonic testing of welds utilizes sound frequencies between (Blank) and
(Blank) - ANSWER-2.5 MHZ and 5 MHZ
,When a change occurs in the material (such as void caused by a defect) the
velocity of the ultrasonic beam changes and what is known as - ANSWER-
Acoustic mismatch
Ultrasonic sound waves are generated by applying electric pulses to (Blank)
crystals - ANSWER-Piezoelectric
What is surface tension - ANSWER-Makes liquid to try to reduce surface area
while in a free state
Which way do flux line go - ANSWER-north to south south to north
The property of liquids that makes them try to reduce their surface area is know
as - ANSWER-Surface Tension
The ability of liquid to wet a solid surface can be measured in terms by -
ANSWER-contact angle
Fluorescent dye be view - ANSWER-Black light
Which of penetrants require treatment with a separate agent before the excess
can be removed - ANSWER-post-emulsifiable, post-remover
What type of developer is normally used with the solvent-removal process to
spot check welds - ANSWER-Non-aqueous
Most common type of LPI for highly sensitive applications such as fatigue
cracks - ANSWER-Fluorescent post-emulsified penetrant process
, When using LPI what shouldn't you do - ANSWER-Use grinder. It can flow the
surface and conceal cracks
When using the solvent-removable method, why should the solvent not be
sprayed directly on the surface to remove excess penetrant - ANSWER-It may
leach penetrant out of discontinuities
When using post-emulsifiable penetrants, the emulsifier must remain in contact
with the surface long enough to - ANSWER-Mix with the excess penetrant but
not long to reach penetrant in the discontinuities
What could be the effect of spraying on too much developer - ANSWER-It
could mask indications
What is the difference between a false indication and a non-relevant indication -
ANSWER-False indications are not associated with discontinuities. Nonrelevant
indications are associated with discontinuities
What causes false indications - ANSWER-Poor cleaning
What indication is most likely caused by a crack - ANSWER-Continuous line
What is most likely caused by porosity - ANSWER-Rounded
If a small crack is found by LPI in an aluminum weld - ANSWER-it may not be
repaired by simply welding over it to melt out the crack, retained penetrant
could contaminate the repair. The metal containing the crack must be removed
before repair
The local magnetic field across a crack in a magnetized piece of steel is known
as - ANSWER-Flux Leakage
