CWB WELDING INSPECTOR LEVEL 1 &
2 COMPREHENSIVE EXAM STUDY
GUIDE (2026/2027)
1. According to CSA W178.2, which of the following is a primary responsibility of a welding
inspector?
A. To direct the welding personnel in the performance of their tasks.
B. To modify welding procedure specifications (WPS) on-site as needed.
C. To verify that all welding is performed in accordance with the applicable codes and
standards.
D. To perform non-destructive testing only when requested by the welder.
Answer: C
Conceptual Explanation: The welding inspector’s primary role is verification of
compliance with codes, standards, and specifications, not directing the work or modifying
procedures.
,2. In the CSA W59 standard, what is the minimum temperature at which preheat is required
for a 20mm thick plate of 350W steel using low-hydrogen electrodes?
A. 20°C
B. 10°C
C. 50°C
D. 100°C
Answer: B
Conceptual Explanation: For 350W steel under 20mm thickness with low hydrogen
processes, CSA W59 Table 5.3 generally requires the steel to be above 10°C.
3. Which welding process is most susceptible to ‘Loafing’ or slag entrapment due to improper
manipulation of the electrode?
A. GMAW
B. SMAW
C. GTAW
D. PAW
Answer: B
Conceptual Explanation: SMAW (Shielded Metal Arc Welding) uses a flux-covered
electrode that produces slag, which can be entrapped if the welder does not maintain the
correct arc length and travel angle.
, 4. What does the ‘49’ represent in the CSA electrode classification E4918-1?
A. Minimum tensile strength of 490 MPa
B. Yield strength of 49,000 psi
C. Maximum tensile strength of 490 MPa
D. 49% elongation capacity
Answer: A
Conceptual Explanation: In CSA G40.21/W48, the number represents the minimum
tensile strength in megapascals divided by 10 (490 MPa).
5. A ‘short circuiting’ metal transfer in GMAW is characterized by:
A. High heat input and deep penetration.
B. Droplets larger than the electrode diameter moving across the arc.
C. The electrode touching the weld pool, causing a momentary short.
D. A continuous stream of fine droplets propelled by electromagnetic forces.
Answer: C
Conceptual Explanation: Short-circuiting transfer occurs when the electrode makes
physical contact with the weld pool, extinguishing the arc momentarily.
6. In welding metallurgy, ‘Hydrogen Induced Cracking’ (HIC) is most likely to occur in the:
A. Weld center line.
2 COMPREHENSIVE EXAM STUDY
GUIDE (2026/2027)
1. According to CSA W178.2, which of the following is a primary responsibility of a welding
inspector?
A. To direct the welding personnel in the performance of their tasks.
B. To modify welding procedure specifications (WPS) on-site as needed.
C. To verify that all welding is performed in accordance with the applicable codes and
standards.
D. To perform non-destructive testing only when requested by the welder.
Answer: C
Conceptual Explanation: The welding inspector’s primary role is verification of
compliance with codes, standards, and specifications, not directing the work or modifying
procedures.
,2. In the CSA W59 standard, what is the minimum temperature at which preheat is required
for a 20mm thick plate of 350W steel using low-hydrogen electrodes?
A. 20°C
B. 10°C
C. 50°C
D. 100°C
Answer: B
Conceptual Explanation: For 350W steel under 20mm thickness with low hydrogen
processes, CSA W59 Table 5.3 generally requires the steel to be above 10°C.
3. Which welding process is most susceptible to ‘Loafing’ or slag entrapment due to improper
manipulation of the electrode?
A. GMAW
B. SMAW
C. GTAW
D. PAW
Answer: B
Conceptual Explanation: SMAW (Shielded Metal Arc Welding) uses a flux-covered
electrode that produces slag, which can be entrapped if the welder does not maintain the
correct arc length and travel angle.
, 4. What does the ‘49’ represent in the CSA electrode classification E4918-1?
A. Minimum tensile strength of 490 MPa
B. Yield strength of 49,000 psi
C. Maximum tensile strength of 490 MPa
D. 49% elongation capacity
Answer: A
Conceptual Explanation: In CSA G40.21/W48, the number represents the minimum
tensile strength in megapascals divided by 10 (490 MPa).
5. A ‘short circuiting’ metal transfer in GMAW is characterized by:
A. High heat input and deep penetration.
B. Droplets larger than the electrode diameter moving across the arc.
C. The electrode touching the weld pool, causing a momentary short.
D. A continuous stream of fine droplets propelled by electromagnetic forces.
Answer: C
Conceptual Explanation: Short-circuiting transfer occurs when the electrode makes
physical contact with the weld pool, extinguishing the arc momentarily.
6. In welding metallurgy, ‘Hydrogen Induced Cracking’ (HIC) is most likely to occur in the:
A. Weld center line.
