TEXAS WELDING QUALITY CONTROL
CERTIFICATION EXAM WITH ACTUAL
QUESTIONS AND VERIFIED ANSWERS,
PLUS EXPLAINED RATIONALES/EXPERT
VERIFIED FOR GUARANTEED 100% PASS
2026/LATEST UPDATE/INSTANT
DOWNLOAD PDF
1. During inspection of a complete penetration groove weld in a
structural steel moment connection, ultrasonic testing reveals a
planar indication oriented parallel to the weld fusion boundary.
Which discontinuity is most likely present?
A. Porosity cluster
B. Slag inclusion
C. Lack of fusion
D. Undercut
Answer: C. Lack of fusion
Rationale: Lack of fusion produces planar discontinuities parallel to the
fusion boundary, making them highly reflective to ultrasonic waves.
Unlike porosity or slag, lack of fusion significantly reduces load-
carrying capacity and is considered a serious rejectable discontinuity in
critical structural welds.
2. Which welding variable has the greatest influence on penetration
depth during Gas Metal Arc Welding (GMAW)?
A. Contact tip recess only
B. Welding current (amperage)
C. Shielding gas flow rate only
D. Electrode storage temperature
1
,Answer: B. Welding current (amperage)
Rationale: Amperage directly controls heat input and melting rate.
Increasing current generally increases penetration, while voltage
primarily affects bead width and arc length.
3. A Quality Control Inspector measures a fillet weld with unequal
leg lengths of 8 mm and 10 mm. What determines the effective
weld size unless otherwise specified?
A. Largest leg length
B. Average leg length
C. Smallest leg length
D. Throat plus reinforcement
Answer: C. Smallest leg length
Rationale: The effective throat of a fillet weld is governed by the smaller
leg dimension unless engineering calculations specify otherwise. This
ensures conservative strength calculations.
4. During visual inspection, a weld exhibits a groove melted into the
base metal adjacent to the weld toe without being filled with weld
metal. This discontinuity is:
A. Overlap
B. Undercut
C. Underfill
D. Root concavity
Answer: B. Undercut
Rationale: Undercut reduces cross-sectional area and creates stress
concentrations that may initiate fatigue cracks. It commonly results from
excessive current or improper travel speed.
2
, 5. Which Nondestructive Examination (NDE) method is most
effective for detecting tight surface-breaking fatigue cracks in
ferromagnetic materials?
A. Radiographic Testing
B. Ultrasonic Testing
C. Magnetic Particle Testing
D. Visual Inspection
Answer: C. Magnetic Particle Testing
Rationale: Magnetic Particle Testing is extremely sensitive to surface
and near-surface discontinuities in ferromagnetic materials because
magnetic leakage fields attract iron particles, making cracks visible.
6. Excessively high heat input during welding primarily increases the
risk of:
A. Hydrogen cracking prevention
B. Grain coarsening in the Heat Affected Zone (HAZ)
C. Improved notch toughness
D. Increased hardness
Answer: B. Grain coarsening in the Heat Affected Zone (HAZ)
Rationale: High heat input allows grains to grow larger, reducing
toughness and potentially lowering mechanical performance in the HAZ.
7. Which electrode classification indicates a low-hydrogen SMAW
electrode with improved moisture resistance?
A. E6010
B. E6013
3
CERTIFICATION EXAM WITH ACTUAL
QUESTIONS AND VERIFIED ANSWERS,
PLUS EXPLAINED RATIONALES/EXPERT
VERIFIED FOR GUARANTEED 100% PASS
2026/LATEST UPDATE/INSTANT
DOWNLOAD PDF
1. During inspection of a complete penetration groove weld in a
structural steel moment connection, ultrasonic testing reveals a
planar indication oriented parallel to the weld fusion boundary.
Which discontinuity is most likely present?
A. Porosity cluster
B. Slag inclusion
C. Lack of fusion
D. Undercut
Answer: C. Lack of fusion
Rationale: Lack of fusion produces planar discontinuities parallel to the
fusion boundary, making them highly reflective to ultrasonic waves.
Unlike porosity or slag, lack of fusion significantly reduces load-
carrying capacity and is considered a serious rejectable discontinuity in
critical structural welds.
2. Which welding variable has the greatest influence on penetration
depth during Gas Metal Arc Welding (GMAW)?
A. Contact tip recess only
B. Welding current (amperage)
C. Shielding gas flow rate only
D. Electrode storage temperature
1
,Answer: B. Welding current (amperage)
Rationale: Amperage directly controls heat input and melting rate.
Increasing current generally increases penetration, while voltage
primarily affects bead width and arc length.
3. A Quality Control Inspector measures a fillet weld with unequal
leg lengths of 8 mm and 10 mm. What determines the effective
weld size unless otherwise specified?
A. Largest leg length
B. Average leg length
C. Smallest leg length
D. Throat plus reinforcement
Answer: C. Smallest leg length
Rationale: The effective throat of a fillet weld is governed by the smaller
leg dimension unless engineering calculations specify otherwise. This
ensures conservative strength calculations.
4. During visual inspection, a weld exhibits a groove melted into the
base metal adjacent to the weld toe without being filled with weld
metal. This discontinuity is:
A. Overlap
B. Undercut
C. Underfill
D. Root concavity
Answer: B. Undercut
Rationale: Undercut reduces cross-sectional area and creates stress
concentrations that may initiate fatigue cracks. It commonly results from
excessive current or improper travel speed.
2
, 5. Which Nondestructive Examination (NDE) method is most
effective for detecting tight surface-breaking fatigue cracks in
ferromagnetic materials?
A. Radiographic Testing
B. Ultrasonic Testing
C. Magnetic Particle Testing
D. Visual Inspection
Answer: C. Magnetic Particle Testing
Rationale: Magnetic Particle Testing is extremely sensitive to surface
and near-surface discontinuities in ferromagnetic materials because
magnetic leakage fields attract iron particles, making cracks visible.
6. Excessively high heat input during welding primarily increases the
risk of:
A. Hydrogen cracking prevention
B. Grain coarsening in the Heat Affected Zone (HAZ)
C. Improved notch toughness
D. Increased hardness
Answer: B. Grain coarsening in the Heat Affected Zone (HAZ)
Rationale: High heat input allows grains to grow larger, reducing
toughness and potentially lowering mechanical performance in the HAZ.
7. Which electrode classification indicates a low-hydrogen SMAW
electrode with improved moisture resistance?
A. E6010
B. E6013
3
