AWS CERTIFIED WELDER BRIDGE WELDING
(D1.5) EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES
Question 1
When must requalification of a welder occur?
Correct Answer
After significant lapse in welding activity or failed test.
Question 2
Minimum preheat for ASTM A709 Grade 50 steel >3/4 in.?
Correct Answer
150°F.
Question 3
Required NDT for complete joint penetration welds in butt joints?
Correct Answer
UT or RT depending on thickness and joint category.
Question 4
What’s required for procedure qualification (PQR)?
Correct Answer
WPS, base metal, filler, CVN results (if required).
Page 1 of 140
,Question 5
Which defect is never permitted in AWS D1.5 welds?
Correct Answer
Cracks.
Question 6
Which clause covers fabrication requirements in AWS D1.5?
Correct Answer
Clause 3 â€" Fabrication.
Page 2 of 140
,Question 7
Which processes are not prequalified in AWS D1.5?
Correct Answer
Processes like GTAW generally require procedure qualification.
### Question 1
**According to AWS D1.5, what is the minimum preheat and interpass temperature
requirement for welding ASTM A709 Grade 50W steel with a thickness of 1.5 inches
using the SMAW process with low-hydrogen electrodes?**
A. 50°F (10°C)
B. 150°F (65°C)
C. 225°F (107°C)
D. 300°F (150°C)
**CORRECT ANSWER: B. 150°F (65°C)**
Rationale: AWS D1.5 specifies minimum preheat and interpass temperatures based
on steel grade, welding process, and base metal thickness. For ASTM A709 Grade
50W steel in the thickness range exceeding 1.5 inches up to 2.5 inches, preheat
temperatures are higher, but for material thickness up to 1.5 inches welded with
low-hydrogen processes, 150°F is the mandatory minimum preheat to prevent
hydrogen-assisted cold cracking.
### Question 2
**Under AWS D1.5 provisions, what is the maximum permissible atmospheric
exposure time for unheated storage of E7018 low-hydrogen electrodes after
removal from hermetically sealed containers?**
Page 3 of 140
, A. 2 hours
B. 4 hours
C. 8 hours
D. 10 hours
**CORRECT ANSWER: B. 4 hours**
Rationale: AWS D1.5 strictly regulates moisture control in low-hydrogen SMAW
electrodes to prevent hydrogen-induced cracking in structural bridge welds.
Standard E7018 electrodes may be exposed to the atmosphere for a maximum of 4
hours before requiring re-baking or continuous storage in a heated electrode oven
maintained at a minimum of 250°F (120°C).
### Question 3
**When performing non-destructive testing (NDT) on tension groove welds in
fracture critical members (FCMs) according to AWS D1.5, which inspection methods
are required?**
A. Visual Inspection (VT) only
B. Radiographic Testing (RT) or Ultrasonic Testing (UT) in combination with VT and
Magnetic Particle Testing (MT)
C. Liquid Penetrant Testing (PT) and VT only
D. Visual Inspection (VT) and Eddy Current Testing (ET)
**CORRECT ANSWER: B. Radiographic Testing (RT) or Ultrasonic Testing (UT) in
combination with VT and Magnetic Particle Testing (MT)**
Page 4 of 140
(D1.5) EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES
Question 1
When must requalification of a welder occur?
Correct Answer
After significant lapse in welding activity or failed test.
Question 2
Minimum preheat for ASTM A709 Grade 50 steel >3/4 in.?
Correct Answer
150°F.
Question 3
Required NDT for complete joint penetration welds in butt joints?
Correct Answer
UT or RT depending on thickness and joint category.
Question 4
What’s required for procedure qualification (PQR)?
Correct Answer
WPS, base metal, filler, CVN results (if required).
Page 1 of 140
,Question 5
Which defect is never permitted in AWS D1.5 welds?
Correct Answer
Cracks.
Question 6
Which clause covers fabrication requirements in AWS D1.5?
Correct Answer
Clause 3 â€" Fabrication.
Page 2 of 140
,Question 7
Which processes are not prequalified in AWS D1.5?
Correct Answer
Processes like GTAW generally require procedure qualification.
### Question 1
**According to AWS D1.5, what is the minimum preheat and interpass temperature
requirement for welding ASTM A709 Grade 50W steel with a thickness of 1.5 inches
using the SMAW process with low-hydrogen electrodes?**
A. 50°F (10°C)
B. 150°F (65°C)
C. 225°F (107°C)
D. 300°F (150°C)
**CORRECT ANSWER: B. 150°F (65°C)**
Rationale: AWS D1.5 specifies minimum preheat and interpass temperatures based
on steel grade, welding process, and base metal thickness. For ASTM A709 Grade
50W steel in the thickness range exceeding 1.5 inches up to 2.5 inches, preheat
temperatures are higher, but for material thickness up to 1.5 inches welded with
low-hydrogen processes, 150°F is the mandatory minimum preheat to prevent
hydrogen-assisted cold cracking.
### Question 2
**Under AWS D1.5 provisions, what is the maximum permissible atmospheric
exposure time for unheated storage of E7018 low-hydrogen electrodes after
removal from hermetically sealed containers?**
Page 3 of 140
, A. 2 hours
B. 4 hours
C. 8 hours
D. 10 hours
**CORRECT ANSWER: B. 4 hours**
Rationale: AWS D1.5 strictly regulates moisture control in low-hydrogen SMAW
electrodes to prevent hydrogen-induced cracking in structural bridge welds.
Standard E7018 electrodes may be exposed to the atmosphere for a maximum of 4
hours before requiring re-baking or continuous storage in a heated electrode oven
maintained at a minimum of 250°F (120°C).
### Question 3
**When performing non-destructive testing (NDT) on tension groove welds in
fracture critical members (FCMs) according to AWS D1.5, which inspection methods
are required?**
A. Visual Inspection (VT) only
B. Radiographic Testing (RT) or Ultrasonic Testing (UT) in combination with VT and
Magnetic Particle Testing (MT)
C. Liquid Penetrant Testing (PT) and VT only
D. Visual Inspection (VT) and Eddy Current Testing (ET)
**CORRECT ANSWER: B. Radiographic Testing (RT) or Ultrasonic Testing (UT) in
combination with VT and Magnetic Particle Testing (MT)**
Page 4 of 140
