CWB (2026) CERTIFICATION EXAM |
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DOMAIN 1: CWB STANDARDS, CODES & QUALITY REQUIREMENTS (12 Questions)
Question 1 (Multiple Choice) According to CSA W47.1, which of the following is a mandatory
requirement for a company to maintain its certification for fusion welding of steel?
A) Annual third-party financial audits of the welding department
B) Welding must be performed in accordance with a qualified WPS by welders holding current
qualifications
C) All welding supervisors must hold engineering degrees
D) Welding procedures must be submitted to the CWB for approval every 6 months
[CORRECT: B]
Rationale: CSA W47.1 explicitly requires that welding be performed in accordance with a
qualified Welding Procedure Specification (WPS) and by welders whose qualifications are
current and valid. This is the foundational requirement of the certification scheme, ensuring
that companies demonstrate consistent ability to produce sound welds. The standard does not
mandate engineering degrees for supervisors (they need CWB supervisor certification) or
require semi-annual submissions of existing qualified procedures.
Question 2 (Multiple Choice) CSA W59 (Welded Steel Construction) specifies that for statically
loaded structures, the maximum allowable undercut depth on a tension member is:
A) 0.5 mm, regardless of member thickness
B) 0.4 mm for members up to 25 mm thick, and 0.8 mm for members over 25 mm thick
C) 1.0 mm for all thicknesses
D) Undercut is not permitted on any tension member
[CORRECT: B]
Rationale: CSA W59 Table 5.3.3 specifies the acceptance criteria for undercut. For statically
loaded structures, undercut on tension members is limited to 0.4 mm (1/64 in.) for material
thickness up to 25 mm, and 0.8 mm (1/32 in.) for material over 25 mm thick. On compression
members, slightly more undercut is permitted (0.8 mm and 1.6 mm respectively). This
,distinction recognizes that tension members are more susceptible to crack initiation at stress
concentrations.
Question 3 (SATA - Select All That Apply) Which of the following are essential variables under
CSA W47.1 that would require requalification of a Welding Procedure Specification (WPS)?
A) Change in welding process (e.g., SMAW to GMAW)
B) Change in base metal group (e.g., Group 1 to Group 2)
C) Increase in preheat temperature by 25°C above the minimum qualified
D) Change from single-pass to multiple-pass welding
E) Change in shielding gas composition from 100% CO₂ to 75% Ar/25% CO₂
[CORRECT: A, B, D, E]
Rationale: Under CSA W47.1 Clause 5.3, essential variables requiring WPS requalification
include: (A) a change in welding process is always an essential variable as it fundamentally alters
the heat input and metallurgical behavior; (B) base metal group changes affect weldability and
mechanical properties; (D) a change from single-pass to multiple-pass welding changes the heat
input profile and grain structure; (E) shielding gas composition significantly affects arc
characteristics, penetration profile, and metallurgical reactions. Increasing preheat temperature
(C) above the minimum qualified value is a non-essential variable—only decreasing preheat
below the qualified minimum would require requalification.
Question 4 (True/False) Under CSA W59, a tack weld made to secure joint alignment during fit-
up may be incorporated into the final weld without specific qualification, provided the tack
welding parameters are within the range of the qualified WPS.
A) True
B) False
[CORRECT: A]
Rationale: CSA W59 Clause 5.2.4 states that tack welds may be incorporated into the final weld
if they are made using a qualified WPS and the welder is qualified for the process and position.
The tack weld parameters must fall within the ranges specified in the qualified WPS. However, if
tack welds are made by unqualified personnel or outside WPS parameters, they must be
completely removed before final welding. This provision recognizes practical shop realities while
maintaining quality control.
,Sub-Topic: Differences Between CSA W47.1 and AWS D1.1 (2 Questions)
Question 5 (Multiple Choice) A Canadian fabricator is bidding on a project that specifies AWS
D1.1 compliance. Which of the following represents a key difference between CSA W47.1 and
AWS D1.1 regarding welder qualification testing?
A) AWS D1.1 requires bend testing for all welder qualification tests, while CSA W47.1 never
requires bend tests
B) CSA W47.1 requires macro-etch examination for all positions, while AWS D1.1 only requires
visual inspection
C) CSA W47.1 qualifies welders to specific WPSs, while AWS D1.1 qualifies welders to essential
variable ranges independent of a specific WPS
D) AWS D1.1 does not recognize GTAW process qualification, while CSA W47.1 does
[CORRECT: C]
Rationale: This is a fundamental structural difference between the two standards. CSA W47.1
(Clause 6.1) ties welder qualification directly to a specific qualified WPS—the welder is qualified
to follow that particular procedure. AWS D1.1 (Clause 4) qualifies welders based on essential
variable ranges (process, position, material thickness, electrode classification), allowing the
qualified welder to weld within those ranges under any WPS that falls within the qualified
parameters. This difference has significant practical implications for welding management and
record-keeping in cross-border projects.
Question 6 (Multiple Choice) Regarding the acceptance criteria for porosity in groove welds
subject to tension, CSA W59 and AWS D1.1 differ in that:
A) AWS D1.1 uses a porosity "chart" method while CSA W59 uses only maximum pore size limits
B) CSA W59 generally permits slightly more porosity than AWS D1.1 for the same weld type
C) AWS D1.1 specifies porosity limits as a percentage of cross-sectional area, while CSA W59
specifies limits based on the diameter of the largest pore and proximity to other pores
D) Both standards use identical porosity acceptance criteria, eliminating the need for dual-
standard compliance programs
[CORRECT: C]
Rationale: AWS D1.1 Table 6.1 specifies porosity acceptance based on the diameter of
individual pores and the proximity of clustered porosity (using a gauge or chart method), while
CSA W59 Table 5.3.3 specifies porosity limits based on the maximum diameter of individual
pores and the minimum spacing between adjacent pores. AWS D1.1 tends to be more
, prescriptive with its "workmanship" approach using comparison charts, while CSA W59 provides
more dimensional criteria. This difference requires inspectors working on dual-standard projects
to be proficient in both evaluation methods.
Sub-Topic: WPS and PQR (3 Questions)
Question 7 (Multiple Choice) A Procedure Qualification Record (PQR) is being prepared for a
new GMAW procedure on CSA G40.21 350W steel, 12 mm thick. According to CSA W47.1, which
mechanical test is NOT required for procedure qualification of this joint?
A) Two transverse tensile tests
B) Two root bend tests
C) Two face bend tests
D) Two Charpy V-notch impact tests
[CORRECT: D]
Rationale: CSA W47.1 Table 5.2 specifies the required mechanical tests for procedure
qualification. For groove welds in non-notched toughness categories (which includes most
standard structural applications), the required tests are: (1) two transverse tensile tests, (2) two
root bend tests, and (3) two face bend tests (or four side bends for material over 25 mm).
Charpy V-notch impact tests are only required when the design or application specifically
mandates notch toughness requirements (such as for bridge components in cold climates or
seismic applications). The standard W47.1 qualification does not include mandatory impact
testing unless specified by the purchaser or applicable construction code.
Question 8 (SATA - Select All That Apply) A welding engineer is reviewing a WPS for a bridge
fabrication project. Which of the following are considered essential variables under CSA W47.1
that would require a new PQR if changed?
A) Changing the backing material from steel to ceramic
B) Increasing the maximum interpass temperature from 250°C to 300°C
C) Changing the electrode classification from E4918 to E4918-1
D) Changing from stringer beads to weave beads
E) Adding a post-weld heat treatment (PWHT) cycle when none was previously required
[CORRECT: A, C, E]
Rationale: Under CSA W47.1 Clause 5.3: (A) Changing backing material is an essential variable
Certified Welding Bureau | Complete Exam with
Verified Solutions.
DOMAIN 1: CWB STANDARDS, CODES & QUALITY REQUIREMENTS (12 Questions)
Question 1 (Multiple Choice) According to CSA W47.1, which of the following is a mandatory
requirement for a company to maintain its certification for fusion welding of steel?
A) Annual third-party financial audits of the welding department
B) Welding must be performed in accordance with a qualified WPS by welders holding current
qualifications
C) All welding supervisors must hold engineering degrees
D) Welding procedures must be submitted to the CWB for approval every 6 months
[CORRECT: B]
Rationale: CSA W47.1 explicitly requires that welding be performed in accordance with a
qualified Welding Procedure Specification (WPS) and by welders whose qualifications are
current and valid. This is the foundational requirement of the certification scheme, ensuring
that companies demonstrate consistent ability to produce sound welds. The standard does not
mandate engineering degrees for supervisors (they need CWB supervisor certification) or
require semi-annual submissions of existing qualified procedures.
Question 2 (Multiple Choice) CSA W59 (Welded Steel Construction) specifies that for statically
loaded structures, the maximum allowable undercut depth on a tension member is:
A) 0.5 mm, regardless of member thickness
B) 0.4 mm for members up to 25 mm thick, and 0.8 mm for members over 25 mm thick
C) 1.0 mm for all thicknesses
D) Undercut is not permitted on any tension member
[CORRECT: B]
Rationale: CSA W59 Table 5.3.3 specifies the acceptance criteria for undercut. For statically
loaded structures, undercut on tension members is limited to 0.4 mm (1/64 in.) for material
thickness up to 25 mm, and 0.8 mm (1/32 in.) for material over 25 mm thick. On compression
members, slightly more undercut is permitted (0.8 mm and 1.6 mm respectively). This
,distinction recognizes that tension members are more susceptible to crack initiation at stress
concentrations.
Question 3 (SATA - Select All That Apply) Which of the following are essential variables under
CSA W47.1 that would require requalification of a Welding Procedure Specification (WPS)?
A) Change in welding process (e.g., SMAW to GMAW)
B) Change in base metal group (e.g., Group 1 to Group 2)
C) Increase in preheat temperature by 25°C above the minimum qualified
D) Change from single-pass to multiple-pass welding
E) Change in shielding gas composition from 100% CO₂ to 75% Ar/25% CO₂
[CORRECT: A, B, D, E]
Rationale: Under CSA W47.1 Clause 5.3, essential variables requiring WPS requalification
include: (A) a change in welding process is always an essential variable as it fundamentally alters
the heat input and metallurgical behavior; (B) base metal group changes affect weldability and
mechanical properties; (D) a change from single-pass to multiple-pass welding changes the heat
input profile and grain structure; (E) shielding gas composition significantly affects arc
characteristics, penetration profile, and metallurgical reactions. Increasing preheat temperature
(C) above the minimum qualified value is a non-essential variable—only decreasing preheat
below the qualified minimum would require requalification.
Question 4 (True/False) Under CSA W59, a tack weld made to secure joint alignment during fit-
up may be incorporated into the final weld without specific qualification, provided the tack
welding parameters are within the range of the qualified WPS.
A) True
B) False
[CORRECT: A]
Rationale: CSA W59 Clause 5.2.4 states that tack welds may be incorporated into the final weld
if they are made using a qualified WPS and the welder is qualified for the process and position.
The tack weld parameters must fall within the ranges specified in the qualified WPS. However, if
tack welds are made by unqualified personnel or outside WPS parameters, they must be
completely removed before final welding. This provision recognizes practical shop realities while
maintaining quality control.
,Sub-Topic: Differences Between CSA W47.1 and AWS D1.1 (2 Questions)
Question 5 (Multiple Choice) A Canadian fabricator is bidding on a project that specifies AWS
D1.1 compliance. Which of the following represents a key difference between CSA W47.1 and
AWS D1.1 regarding welder qualification testing?
A) AWS D1.1 requires bend testing for all welder qualification tests, while CSA W47.1 never
requires bend tests
B) CSA W47.1 requires macro-etch examination for all positions, while AWS D1.1 only requires
visual inspection
C) CSA W47.1 qualifies welders to specific WPSs, while AWS D1.1 qualifies welders to essential
variable ranges independent of a specific WPS
D) AWS D1.1 does not recognize GTAW process qualification, while CSA W47.1 does
[CORRECT: C]
Rationale: This is a fundamental structural difference between the two standards. CSA W47.1
(Clause 6.1) ties welder qualification directly to a specific qualified WPS—the welder is qualified
to follow that particular procedure. AWS D1.1 (Clause 4) qualifies welders based on essential
variable ranges (process, position, material thickness, electrode classification), allowing the
qualified welder to weld within those ranges under any WPS that falls within the qualified
parameters. This difference has significant practical implications for welding management and
record-keeping in cross-border projects.
Question 6 (Multiple Choice) Regarding the acceptance criteria for porosity in groove welds
subject to tension, CSA W59 and AWS D1.1 differ in that:
A) AWS D1.1 uses a porosity "chart" method while CSA W59 uses only maximum pore size limits
B) CSA W59 generally permits slightly more porosity than AWS D1.1 for the same weld type
C) AWS D1.1 specifies porosity limits as a percentage of cross-sectional area, while CSA W59
specifies limits based on the diameter of the largest pore and proximity to other pores
D) Both standards use identical porosity acceptance criteria, eliminating the need for dual-
standard compliance programs
[CORRECT: C]
Rationale: AWS D1.1 Table 6.1 specifies porosity acceptance based on the diameter of
individual pores and the proximity of clustered porosity (using a gauge or chart method), while
CSA W59 Table 5.3.3 specifies porosity limits based on the maximum diameter of individual
pores and the minimum spacing between adjacent pores. AWS D1.1 tends to be more
, prescriptive with its "workmanship" approach using comparison charts, while CSA W59 provides
more dimensional criteria. This difference requires inspectors working on dual-standard projects
to be proficient in both evaluation methods.
Sub-Topic: WPS and PQR (3 Questions)
Question 7 (Multiple Choice) A Procedure Qualification Record (PQR) is being prepared for a
new GMAW procedure on CSA G40.21 350W steel, 12 mm thick. According to CSA W47.1, which
mechanical test is NOT required for procedure qualification of this joint?
A) Two transverse tensile tests
B) Two root bend tests
C) Two face bend tests
D) Two Charpy V-notch impact tests
[CORRECT: D]
Rationale: CSA W47.1 Table 5.2 specifies the required mechanical tests for procedure
qualification. For groove welds in non-notched toughness categories (which includes most
standard structural applications), the required tests are: (1) two transverse tensile tests, (2) two
root bend tests, and (3) two face bend tests (or four side bends for material over 25 mm).
Charpy V-notch impact tests are only required when the design or application specifically
mandates notch toughness requirements (such as for bridge components in cold climates or
seismic applications). The standard W47.1 qualification does not include mandatory impact
testing unless specified by the purchaser or applicable construction code.
Question 8 (SATA - Select All That Apply) A welding engineer is reviewing a WPS for a bridge
fabrication project. Which of the following are considered essential variables under CSA W47.1
that would require a new PQR if changed?
A) Changing the backing material from steel to ceramic
B) Increasing the maximum interpass temperature from 250°C to 300°C
C) Changing the electrode classification from E4918 to E4918-1
D) Changing from stringer beads to weave beads
E) Adding a post-weld heat treatment (PWHT) cycle when none was previously required
[CORRECT: A, C, E]
Rationale: Under CSA W47.1 Clause 5.3: (A) Changing backing material is an essential variable
