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Canadian Welding Bureau (CWB) Level 2 Welding
Inspector EXAM Questions with Correct Answers and
explanations LATEST THIS YEAR -JUST RELEASED
Canadian Welding Bureau (CWB) Level 2 Welding Inspector Certification
Exam Coverage Summary: CSA W178.2 Certification Requirements, Welding Metallurgy (Phase
transformations, HAZ, Sensitization), Welding Processes (SMAW, GMAW, FCAW, SAW, GTAW),
Destructive & Non-Destructive Testing (VT, MT, PT, UT, RT), Welding Symbols & Blueprint Reading,
Welder Performance Qualification (WPQ), Procedure Qualification Record (PQR), Discontinuities &
Defects (Cracks, Porosity, Inclusions), and Inspection Documentation.
1. When interpreting an isometric drawing according to standard North American drafting practices, at
what exact angle are the width, length, and depth lines inclined?
A) 15 degrees
B) 30 degrees
C) 45 degrees
D) 60 degrees
*Rationale: Isometric drawings project the three-dimensional object onto a two-dimensional plane with
all axes inclined at exactly 30 degrees from the horizontal, allowing accurate scaling without distortion .*
, Page 2 of 123
2. A Level 2 Welding Inspector is on-site and observes a welder performing a root pass on a stainless
steel pipe without backing gas. What is the most likely consequence of this omission?
A) The weld will have excessive reinforcement
B) The root will oxidize, forming a porous, jagged surface known as "sugaring"
C) The arc will be unstable and difficult to control
D) The electrode will stick to the base metal
Rationale: Without an inert backing gas (purge), the molten chromium reacts with oxygen, causing
heavy oxidation and a porous root surface called sugaring, which destroys corrosion resistance .
3. Which of the following discontinuities is universally considered unacceptable in a welded joint
regardless of its size or location, per most structural codes?
A) Porosity
B) Slag inclusion
C) Crack
D) Incomplete penetration
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Rationale: Cracks are stress risers that can propagate catastrophically; unlike porosity or inclusions, no
code allows cracks of any size because they indicate a fundamental failure of the weld integrity .
4. You are reviewing a welding procedure that specifies "DCEP" (Direct Current Electrode Positive). What
is the electrical characteristic and typical application of this polarity?
A) Electricity flows from electrode to base metal; used for high deposition rates
B) Electricity flows from base metal to electrode; provides deep penetration and is standard for SMAW
C) Current alternates direction; used to reduce arc blow
D) Voltage is constant; used for short-circuit transfer
Rationale: DCEP (reverse polarity) means the electrode is positive, directing two-thirds of the arc heat
into the base metal, providing deep penetration essential for structural welding .
5. A 25 mm (1 inch) thick carbon steel plate is being cut. Which cutting process would produce the
narrowest Heat Affected Zone (HAZ)?
A) Oxy-acetylene cutting
B) Plasma arc cutting
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C) Air-carbon arc cutting
D) Laser beam cutting
Rationale: Laser cutting uses a highly concentrated monochromatic beam, vaporizing metal instantly
with minimal heat input, resulting in the narrowest possible HAZ compared to thermal plasma or flame
methods .
6. According to CSA Standard W178.2, which of the following is a core responsibility of a Level 2 Welding
Inspector that distinguishes them from a Level 1?
A) Perform radiographic interpretation independently
B) Prepare welding procedure specifications
C) Operate without continuous supervision and make binding acceptance/rejection decisions
D) Calibrate nondestructive testing equipment
*Rationale: The fundamental Level 2 qualification allows for independent work and binding
legal/structural decisions, whereas Level 1 operates under direct supervision .*
7. You are performing a visual inspection on a weld and notice a linear indication running parallel to the
weld axis but completely inside the weld metal. This is most likely a:
Canadian Welding Bureau (CWB) Level 2 Welding
Inspector EXAM Questions with Correct Answers and
explanations LATEST THIS YEAR -JUST RELEASED
Canadian Welding Bureau (CWB) Level 2 Welding Inspector Certification
Exam Coverage Summary: CSA W178.2 Certification Requirements, Welding Metallurgy (Phase
transformations, HAZ, Sensitization), Welding Processes (SMAW, GMAW, FCAW, SAW, GTAW),
Destructive & Non-Destructive Testing (VT, MT, PT, UT, RT), Welding Symbols & Blueprint Reading,
Welder Performance Qualification (WPQ), Procedure Qualification Record (PQR), Discontinuities &
Defects (Cracks, Porosity, Inclusions), and Inspection Documentation.
1. When interpreting an isometric drawing according to standard North American drafting practices, at
what exact angle are the width, length, and depth lines inclined?
A) 15 degrees
B) 30 degrees
C) 45 degrees
D) 60 degrees
*Rationale: Isometric drawings project the three-dimensional object onto a two-dimensional plane with
all axes inclined at exactly 30 degrees from the horizontal, allowing accurate scaling without distortion .*
, Page 2 of 123
2. A Level 2 Welding Inspector is on-site and observes a welder performing a root pass on a stainless
steel pipe without backing gas. What is the most likely consequence of this omission?
A) The weld will have excessive reinforcement
B) The root will oxidize, forming a porous, jagged surface known as "sugaring"
C) The arc will be unstable and difficult to control
D) The electrode will stick to the base metal
Rationale: Without an inert backing gas (purge), the molten chromium reacts with oxygen, causing
heavy oxidation and a porous root surface called sugaring, which destroys corrosion resistance .
3. Which of the following discontinuities is universally considered unacceptable in a welded joint
regardless of its size or location, per most structural codes?
A) Porosity
B) Slag inclusion
C) Crack
D) Incomplete penetration
, Page 3 of 123
Rationale: Cracks are stress risers that can propagate catastrophically; unlike porosity or inclusions, no
code allows cracks of any size because they indicate a fundamental failure of the weld integrity .
4. You are reviewing a welding procedure that specifies "DCEP" (Direct Current Electrode Positive). What
is the electrical characteristic and typical application of this polarity?
A) Electricity flows from electrode to base metal; used for high deposition rates
B) Electricity flows from base metal to electrode; provides deep penetration and is standard for SMAW
C) Current alternates direction; used to reduce arc blow
D) Voltage is constant; used for short-circuit transfer
Rationale: DCEP (reverse polarity) means the electrode is positive, directing two-thirds of the arc heat
into the base metal, providing deep penetration essential for structural welding .
5. A 25 mm (1 inch) thick carbon steel plate is being cut. Which cutting process would produce the
narrowest Heat Affected Zone (HAZ)?
A) Oxy-acetylene cutting
B) Plasma arc cutting
, Page 4 of 123
C) Air-carbon arc cutting
D) Laser beam cutting
Rationale: Laser cutting uses a highly concentrated monochromatic beam, vaporizing metal instantly
with minimal heat input, resulting in the narrowest possible HAZ compared to thermal plasma or flame
methods .
6. According to CSA Standard W178.2, which of the following is a core responsibility of a Level 2 Welding
Inspector that distinguishes them from a Level 1?
A) Perform radiographic interpretation independently
B) Prepare welding procedure specifications
C) Operate without continuous supervision and make binding acceptance/rejection decisions
D) Calibrate nondestructive testing equipment
*Rationale: The fundamental Level 2 qualification allows for independent work and binding
legal/structural decisions, whereas Level 1 operates under direct supervision .*
7. You are performing a visual inspection on a weld and notice a linear indication running parallel to the
weld axis but completely inside the weld metal. This is most likely a:
