CWB WELDING INSPECTOR
COMPREHENSIVE EXAMINATION
(LATEST STUDY GUIDE) QUESTIONS
AND ANSWERS
1. Which power source characteristic is mandatory for Shielded Metal Arc Welding (SMAW)
to maintain a stable arc despite slight changes in arc length?
A. Constant Current (CC)
B. Constant Voltage (CV)
C. Variable Voltage (VV)
D. Constant Wattage (CW)
Answer: A
Conceptual Explanation: SMAW requires a Constant Current power source to ensure that
the welding current remains relatively stable even if the welder fluctuates the arc length
manually.
2. The Heat Affected Zone (HAZ) is best described as:
A. The portion of the weld that has been melted
,B. The portion of base metal that has not been melted, but whose microstructure has been
altered by heat
C. The interface between the weld metal and the base metal
D. The area where shielding gas is most effective
Answer: B
Conceptual Explanation: The HAZ is the part of the base metal that underwent
microstructural changes due to the heat of welding without reaching the melting point.
3. Which mechanical test is primarily used to determine the notch toughness of a weld at
specific temperatures?
A. Guided Bend Test
B. Tension Test
C. Brinell Hardness Test
D. Charpy V-Notch Impact Test
Answer: D
Conceptual Explanation: The Charpy V-Notch test measures the energy absorbed by a
material during fracture, indicating its toughness and resistance to brittle failure at specific
temperatures.
, 4. In Radiographic Testing (RT), the device used to confirm the sensitivity and quality of the
radiograph is known as a(n):
A. Image Quality Indicator (IQI) or Penetrameter
B. Intensifying screen
C. Collimator
D. Dosimeter
Answer: A
Conceptual Explanation: An IQI or penetrameter is placed on the part during exposure to
ensure the radiographic technique is sensitive enough to detect required detail levels.
5. Magnetic Particle Testing (MT) is limited to the detection of discontinuities in which type of
materials?
A. All metallic materials
B. Non-ferrous alloys
C. Austenitic stainless steels
D. Ferromagnetic materials
Answer: D
Conceptual Explanation: MT relies on magnetic flux leakage, which only occurs in
ferromagnetic materials like carbon steel; it cannot be used on aluminum or austenitic
stainless steel.
COMPREHENSIVE EXAMINATION
(LATEST STUDY GUIDE) QUESTIONS
AND ANSWERS
1. Which power source characteristic is mandatory for Shielded Metal Arc Welding (SMAW)
to maintain a stable arc despite slight changes in arc length?
A. Constant Current (CC)
B. Constant Voltage (CV)
C. Variable Voltage (VV)
D. Constant Wattage (CW)
Answer: A
Conceptual Explanation: SMAW requires a Constant Current power source to ensure that
the welding current remains relatively stable even if the welder fluctuates the arc length
manually.
2. The Heat Affected Zone (HAZ) is best described as:
A. The portion of the weld that has been melted
,B. The portion of base metal that has not been melted, but whose microstructure has been
altered by heat
C. The interface between the weld metal and the base metal
D. The area where shielding gas is most effective
Answer: B
Conceptual Explanation: The HAZ is the part of the base metal that underwent
microstructural changes due to the heat of welding without reaching the melting point.
3. Which mechanical test is primarily used to determine the notch toughness of a weld at
specific temperatures?
A. Guided Bend Test
B. Tension Test
C. Brinell Hardness Test
D. Charpy V-Notch Impact Test
Answer: D
Conceptual Explanation: The Charpy V-Notch test measures the energy absorbed by a
material during fracture, indicating its toughness and resistance to brittle failure at specific
temperatures.
, 4. In Radiographic Testing (RT), the device used to confirm the sensitivity and quality of the
radiograph is known as a(n):
A. Image Quality Indicator (IQI) or Penetrameter
B. Intensifying screen
C. Collimator
D. Dosimeter
Answer: A
Conceptual Explanation: An IQI or penetrameter is placed on the part during exposure to
ensure the radiographic technique is sensitive enough to detect required detail levels.
5. Magnetic Particle Testing (MT) is limited to the detection of discontinuities in which type of
materials?
A. All metallic materials
B. Non-ferrous alloys
C. Austenitic stainless steels
D. Ferromagnetic materials
Answer: D
Conceptual Explanation: MT relies on magnetic flux leakage, which only occurs in
ferromagnetic materials like carbon steel; it cannot be used on aluminum or austenitic
stainless steel.
