AWS Certified Welding Inspector (CWI) Exam
Questions With Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
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1. Which welding process uses a continuously fed consumable
electrode and a shielding gas?
a) Shielded metal arc welding (SMAW)
b) Gas tungsten arc welding (GTAW)
c) Gas metal arc welding (GMAW)
d) Flux-cored arc welding (FCAW)
c) Gas metal arc welding (GMAW)
Rationale: GMAW uses a continuously fed wire electrode and shielding
gas to protect the weld from contamination. SMAW uses stick
electrodes, GTAW uses a non-consumable tungsten electrode, and
FCAW may or may not use shielding gas depending on the flux type.
2. What is the primary purpose of preheat in welding?
a) Reduce the welding time
, b) Increase weld size
c) Minimize hydrogen-induced cracking
d) Improve welding speed
c) Minimize hydrogen-induced cracking
Rationale: Preheating reduces the cooling rate of the weld, thereby
reducing residual stress and the risk of hydrogen-induced cracking in
the heat-affected zone.
3. Which of the following inspection methods can detect surface
discontinuities?
a) Radiographic testing
b) Ultrasonic testing
c) Magnetic particle testing
d) Liquid penetrant testing
d) Liquid penetrant testing
Rationale: Liquid penetrant testing is specifically used for surface-
breaking defects. Radiographic and ultrasonic testing detect internal
defects, while magnetic particle testing detects surface and slightly
subsurface defects in ferromagnetic materials.
, 4. What does the term “fillet weld leg” refer to?
a) The throat of the weld
b) The distance from the root to the toe along the joint
c) The width of the weld face
d) The length of the weld
b) The distance from the root to the toe along the joint
Rationale: The fillet weld leg is the perpendicular distance from the
root of the weld to the toe, defining the size of the weld.
5. Which factor most affects the toughness of a welded joint?
a) Welding electrode diameter
b) Heat-affected zone microstructure
c) Welding speed
d) Joint design
b) Heat-affected zone microstructure
Rationale: The microstructure of the HAZ determines mechanical
properties, including toughness. Improper heat input can cause coarse
grains, reducing toughness.
, 6. Which welding position is defined as flat (1G or 1F)?
a) Welding on the underside of a horizontal surface
b) Welding on the vertical surface
c) Welding overhead
d) Welding horizontally
a) Welding on the underside of a horizontal surface
Rationale: The flat position involves welding on the top side of a
horizontal surface, with the electrode angled downward, generally
considered the easiest position.
7. What is the minimum bend test angle for steel welds per AWS
standards?
a) 45°
b) 90°
c) 120°
d) 180°
b) 90°
Rationale: AWS standards typically require weld bend tests to achieve
a 90° bend without failure to verify ductility and soundness.
Questions With Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
1. Which welding process uses a continuously fed consumable
electrode and a shielding gas?
a) Shielded metal arc welding (SMAW)
b) Gas tungsten arc welding (GTAW)
c) Gas metal arc welding (GMAW)
d) Flux-cored arc welding (FCAW)
c) Gas metal arc welding (GMAW)
Rationale: GMAW uses a continuously fed wire electrode and shielding
gas to protect the weld from contamination. SMAW uses stick
electrodes, GTAW uses a non-consumable tungsten electrode, and
FCAW may or may not use shielding gas depending on the flux type.
2. What is the primary purpose of preheat in welding?
a) Reduce the welding time
, b) Increase weld size
c) Minimize hydrogen-induced cracking
d) Improve welding speed
c) Minimize hydrogen-induced cracking
Rationale: Preheating reduces the cooling rate of the weld, thereby
reducing residual stress and the risk of hydrogen-induced cracking in
the heat-affected zone.
3. Which of the following inspection methods can detect surface
discontinuities?
a) Radiographic testing
b) Ultrasonic testing
c) Magnetic particle testing
d) Liquid penetrant testing
d) Liquid penetrant testing
Rationale: Liquid penetrant testing is specifically used for surface-
breaking defects. Radiographic and ultrasonic testing detect internal
defects, while magnetic particle testing detects surface and slightly
subsurface defects in ferromagnetic materials.
, 4. What does the term “fillet weld leg” refer to?
a) The throat of the weld
b) The distance from the root to the toe along the joint
c) The width of the weld face
d) The length of the weld
b) The distance from the root to the toe along the joint
Rationale: The fillet weld leg is the perpendicular distance from the
root of the weld to the toe, defining the size of the weld.
5. Which factor most affects the toughness of a welded joint?
a) Welding electrode diameter
b) Heat-affected zone microstructure
c) Welding speed
d) Joint design
b) Heat-affected zone microstructure
Rationale: The microstructure of the HAZ determines mechanical
properties, including toughness. Improper heat input can cause coarse
grains, reducing toughness.
, 6. Which welding position is defined as flat (1G or 1F)?
a) Welding on the underside of a horizontal surface
b) Welding on the vertical surface
c) Welding overhead
d) Welding horizontally
a) Welding on the underside of a horizontal surface
Rationale: The flat position involves welding on the top side of a
horizontal surface, with the electrode angled downward, generally
considered the easiest position.
7. What is the minimum bend test angle for steel welds per AWS
standards?
a) 45°
b) 90°
c) 120°
d) 180°
b) 90°
Rationale: AWS standards typically require weld bend tests to achieve
a 90° bend without failure to verify ductility and soundness.
