Welding Inspector Certification Exam practice
with Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download Pdf.:
1. What is the primary purpose of a welding procedure specification
(WPS)?
A) To list the equipment used
B) To specify welding consumables only
C) To provide detailed instructions for producing a sound weld
D) To outline safety rules only
It ensures welds are performed consistently and meet required
standards.
2. Which type of NDT (Non-Destructive Testing) is most suitable for
detecting surface cracks?
A) Radiographic Testing (RT)
B) Liquid Penetrant Testing (PT)
C) Ultrasonic Testing (UT)
D) Magnetic Particle Testing (MT)
PT is excellent for detecting surface-breaking defects in non-porous
materials.
3. What is the typical purpose of preheating before welding?
A) To melt the base metal completely
B) To clean the surface of the metal
C) To reduce the risk of cracking by slowing cooling
,D) To increase welding speed
Preheating minimizes thermal stresses that can cause cracking.
4. Which welding process uses a non-consumable electrode?
A) Shielded Metal Arc Welding (SMAW)
B) Gas Metal Arc Welding (GMAW)
C) Gas Tungsten Arc Welding (GTAW/TIG)
D) Flux-Cored Arc Welding (FCAW)
GTAW uses a tungsten electrode that does not melt during welding.
5. What is the primary function of a weld backing bar?
A) To increase weld speed
B) To clean the weld surface
C) To support the root pass and prevent burn-through
D) To add filler metal
It supports molten metal at the joint root and ensures proper fusion.
6. Which type of welding joint is used when two plates are joined at
an angle?
A) Butt joint
B) Lap joint
C) Corner joint
D) Edge joint
Corner joints join two pieces at an angle, typically 90°.
7. What is the purpose of post-weld heat treatment (PWHT)?
A) To make the weld brighter
, B) To speed up welding
C) To reduce residual stresses and improve toughness
D) To increase electrode life
PWHT relieves stresses induced by welding and improves mechanical
properties.
8. In SMAW, what is the main role of the flux coating on the
electrode?
A) To act as filler metal only
B) To cool the weld quickly
C) To protect the weld pool from atmospheric contamination
D) To reduce arc voltage
Flux produces a protective gas and slag to shield the molten metal.
9. What defect is indicated by overlapping in a weld?
A) Porosity
B) Lack of fusion
C) Metal rolls over the base metal without bonding
D) Cracking
Overlap occurs when weld metal flows over the surface without fusing
properly.
10. Which standard is commonly referenced for welding inspection in
structural steel?
A) API 1104
B) AWS D1.1
C) ASME B31.3
with Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download Pdf.:
1. What is the primary purpose of a welding procedure specification
(WPS)?
A) To list the equipment used
B) To specify welding consumables only
C) To provide detailed instructions for producing a sound weld
D) To outline safety rules only
It ensures welds are performed consistently and meet required
standards.
2. Which type of NDT (Non-Destructive Testing) is most suitable for
detecting surface cracks?
A) Radiographic Testing (RT)
B) Liquid Penetrant Testing (PT)
C) Ultrasonic Testing (UT)
D) Magnetic Particle Testing (MT)
PT is excellent for detecting surface-breaking defects in non-porous
materials.
3. What is the typical purpose of preheating before welding?
A) To melt the base metal completely
B) To clean the surface of the metal
C) To reduce the risk of cracking by slowing cooling
,D) To increase welding speed
Preheating minimizes thermal stresses that can cause cracking.
4. Which welding process uses a non-consumable electrode?
A) Shielded Metal Arc Welding (SMAW)
B) Gas Metal Arc Welding (GMAW)
C) Gas Tungsten Arc Welding (GTAW/TIG)
D) Flux-Cored Arc Welding (FCAW)
GTAW uses a tungsten electrode that does not melt during welding.
5. What is the primary function of a weld backing bar?
A) To increase weld speed
B) To clean the weld surface
C) To support the root pass and prevent burn-through
D) To add filler metal
It supports molten metal at the joint root and ensures proper fusion.
6. Which type of welding joint is used when two plates are joined at
an angle?
A) Butt joint
B) Lap joint
C) Corner joint
D) Edge joint
Corner joints join two pieces at an angle, typically 90°.
7. What is the purpose of post-weld heat treatment (PWHT)?
A) To make the weld brighter
, B) To speed up welding
C) To reduce residual stresses and improve toughness
D) To increase electrode life
PWHT relieves stresses induced by welding and improves mechanical
properties.
8. In SMAW, what is the main role of the flux coating on the
electrode?
A) To act as filler metal only
B) To cool the weld quickly
C) To protect the weld pool from atmospheric contamination
D) To reduce arc voltage
Flux produces a protective gas and slag to shield the molten metal.
9. What defect is indicated by overlapping in a weld?
A) Porosity
B) Lack of fusion
C) Metal rolls over the base metal without bonding
D) Cracking
Overlap occurs when weld metal flows over the surface without fusing
properly.
10. Which standard is commonly referenced for welding inspection in
structural steel?
A) API 1104
B) AWS D1.1
C) ASME B31.3
