Welding Inspector Certification Exam –
Practice Questions (1–100)
1. What is the primary purpose of preheat in welding?
A. Reduce welding speed
B. Increase weld bead size
C. Reduce the risk of cracking
D. Improve filler metal fusion
Preheating reduces the temperature gradient, minimizing the
risk of hydrogen-induced cracking and improving weld integrity.
2. Which NDT method uses high-frequency sound waves to detect
internal defects?
A. Radiographic Testing
B. Magnetic Particle Testing
C. Liquid Penetrant Testing
D. Ultrasonic Testing
Ultrasonic testing sends sound waves through the material;
reflections indicate internal flaws.
3. A fillet weld is measured by:
A. Leg length and throat
B. Throat and leg length
C. Diameter
D. Depth of penetration
Fillet welds are specified by leg length and throat to ensure
proper strength.
,4. What is the purpose of post-weld heat treatment (PWHT)?
A. Increase deposition rate
B. Reduce residual stress and improve toughness
C. Increase welding speed
D. Clean the weld surface
PWHT helps relieve residual stresses and improve mechanical
properties such as toughness and ductility.
5. The AWS symbol for a field weld is:
A. Circle
B. Flag
C. Triangle
D. Square
A flag on the welding symbol indicates the weld is to be made in
the field.
6. What is the maximum allowable undercut for a butt weld on
structural steel?
A. 1/16 in.
B. 1/8 in.
C. 1/16 in. or as specified by code
D. 1/4 in.
Standards limit undercut to prevent stress concentration and
cracking; often 1/16 in. unless specified otherwise.
7. Which welding process is most commonly used for pipeline
welding?
A. SMAW
B. GMAW
C. FCAW
D. SMAW or GTAW depending on code
Shielded Metal Arc Welding (SMAW) is commonly used in
, pipelines due to field adaptability, while GTAW is sometimes
used for critical joints.
8. What is the primary purpose of a weld symbol reference line?
A. Show size of weld
B. Indicate location and type of weld
C. Show welding sequence
D. Indicate electrode type
The reference line in a welding symbol serves as the central
guide to show weld type, size, and location.
9. What does a “backing weld” accomplish?
A. Strengthens the root only
B. Supports and ensures complete root penetration
C. Eliminates the need for filler
D. Reduces heat input
Backing welds provide support for complete fusion at the root
and prevent burn-through.
10. When performing a visual inspection, what is considered an
unacceptable weld defect?
A. Minor undercut
B. Slight porosity
C. Cracks
D. Slight overlap
Cracks are a critical defect and are never acceptable due to the
high risk of failure.
11. What is the function of a slag inclusion?
A. Improve weld strength
B. It is a defect that weakens the weld
C. Increase penetration
D. Reduce spatter
Practice Questions (1–100)
1. What is the primary purpose of preheat in welding?
A. Reduce welding speed
B. Increase weld bead size
C. Reduce the risk of cracking
D. Improve filler metal fusion
Preheating reduces the temperature gradient, minimizing the
risk of hydrogen-induced cracking and improving weld integrity.
2. Which NDT method uses high-frequency sound waves to detect
internal defects?
A. Radiographic Testing
B. Magnetic Particle Testing
C. Liquid Penetrant Testing
D. Ultrasonic Testing
Ultrasonic testing sends sound waves through the material;
reflections indicate internal flaws.
3. A fillet weld is measured by:
A. Leg length and throat
B. Throat and leg length
C. Diameter
D. Depth of penetration
Fillet welds are specified by leg length and throat to ensure
proper strength.
,4. What is the purpose of post-weld heat treatment (PWHT)?
A. Increase deposition rate
B. Reduce residual stress and improve toughness
C. Increase welding speed
D. Clean the weld surface
PWHT helps relieve residual stresses and improve mechanical
properties such as toughness and ductility.
5. The AWS symbol for a field weld is:
A. Circle
B. Flag
C. Triangle
D. Square
A flag on the welding symbol indicates the weld is to be made in
the field.
6. What is the maximum allowable undercut for a butt weld on
structural steel?
A. 1/16 in.
B. 1/8 in.
C. 1/16 in. or as specified by code
D. 1/4 in.
Standards limit undercut to prevent stress concentration and
cracking; often 1/16 in. unless specified otherwise.
7. Which welding process is most commonly used for pipeline
welding?
A. SMAW
B. GMAW
C. FCAW
D. SMAW or GTAW depending on code
Shielded Metal Arc Welding (SMAW) is commonly used in
, pipelines due to field adaptability, while GTAW is sometimes
used for critical joints.
8. What is the primary purpose of a weld symbol reference line?
A. Show size of weld
B. Indicate location and type of weld
C. Show welding sequence
D. Indicate electrode type
The reference line in a welding symbol serves as the central
guide to show weld type, size, and location.
9. What does a “backing weld” accomplish?
A. Strengthens the root only
B. Supports and ensures complete root penetration
C. Eliminates the need for filler
D. Reduces heat input
Backing welds provide support for complete fusion at the root
and prevent burn-through.
10. When performing a visual inspection, what is considered an
unacceptable weld defect?
A. Minor undercut
B. Slight porosity
C. Cracks
D. Slight overlap
Cracks are a critical defect and are never acceptable due to the
high risk of failure.
11. What is the function of a slag inclusion?
A. Improve weld strength
B. It is a defect that weakens the weld
C. Increase penetration
D. Reduce spatter
