AWS Certified Welder Bridge Welding
D1.5 Exam With Actual Questions &
Verified Answers, Plus Explained
Rationales/Expert Verified For
Guaranteed Pass 2026/Latest
Updated/Instant Download Pdf
1. What is the primary purpose of a backing bar in groove welds?
A. To increase weld size
B. To support molten metal and prevent burn-through
C. To reduce heat input
D. To improve weld appearance
B. To support molten metal and prevent burn-through
Rationale: A backing bar provides support for the molten weld
pool and prevents burn-through, especially on thin materials.
2. Which welding process is most commonly used in bridge
construction per AWS D1.5?
A. Oxy-fuel welding
B. SMAW (Shielded Metal Arc Welding)
C. GTAW (TIG)
D. Laser welding
B. SMAW (Shielded Metal Arc Welding)
Rationale: SMAW is widely used in structural bridge welding due
to its versatility and suitability for field conditions.
,3. What is the maximum allowable preheat temperature for carbon
steel thicker than 2 inches?
A. 100°F
B. 200°F
C. 300°F
D. 400°F
C. 300°F
Rationale: AWS D1.5 specifies preheat up to 300°F for thick
carbon steel to avoid cracking.
4. What type of joint is typically used for bridge girders?
A. Lap joint
B. Butt joint
C. Tee joint
D. Corner joint
B. Butt joint
Rationale: Butt joints are commonly used in bridge girders to
join plates edge-to-edge.
5. What is the primary purpose of a welding procedure specification
(WPS)?
A. To define visual inspection standards
B. To describe the welding process, parameters, and materials
C. To certify welders
D. To specify paint requirements
B. To describe the welding process, parameters, and materials
Rationale: A WPS ensures consistent, high-quality welds by
providing specific instructions for welding.
6. When welding in the flat position, what is the typical electrode
angle?
A. 0–10°
, B. 15–30°
C. 45–60°
D. 60–75°
B. 15–30°
Rationale: A slight electrode tilt helps control the weld pool and
reduce spatter in flat welding.
7. What is the typical travel speed for SMAW on 1/2-inch steel?
A. 1–2 in/min
B. 3–6 in/min
C. 8–12 in/min
D. 15–20 in/min
B. 3–6 in/min
Rationale: Maintaining proper travel speed ensures adequate
fusion and prevents defects.
8. Which inspection method is required for critical bridge welds?
A. Visual inspection only
B. Ultrasonic testing, radiographic testing, or magnetic particle
testing
C. Surface roughness measurement
D. Hardness testing
B. Ultrasonic testing, radiographic testing, or magnetic particle
testing
Rationale: Critical welds in bridges often require NDT to detect
internal or surface flaws.
9. What is the minimum root opening recommended for a single V-
groove weld on 1-inch steel?
A. 1/16 inch
B. 1/8 inch
C. 1/4 inch
, D. 3/8 inch
B. 1/8 inch
Rationale: A 1/8-inch root opening ensures proper penetration
and fusion in single V-groove welds.
10. What is the primary risk if preheat is not applied on high-
carbon steel?
A. Excessive spatter
B. Increased residual stresses and cracking
C. Weld distortion
D. Porosity
B. Increased residual stresses and cracking
Rationale: Preheating reduces thermal gradients, lowering the
risk of cracking in high-carbon steels.
11. In D1.5, which electrode type is most commonly used for
structural steel?
A. E6010
B. E7018
C. E308L
D. E4043
B. E7018
Rationale: E7018 low-hydrogen electrodes provide strong, crack-
resistant welds suitable for bridge structures.
12. What is the recommended interpass temperature for SMAW
on thick steel?
A. 150–200°F
B. 250–300°F
C. 350–400°F
D. 400–500°F
B. 250–300°F
D1.5 Exam With Actual Questions &
Verified Answers, Plus Explained
Rationales/Expert Verified For
Guaranteed Pass 2026/Latest
Updated/Instant Download Pdf
1. What is the primary purpose of a backing bar in groove welds?
A. To increase weld size
B. To support molten metal and prevent burn-through
C. To reduce heat input
D. To improve weld appearance
B. To support molten metal and prevent burn-through
Rationale: A backing bar provides support for the molten weld
pool and prevents burn-through, especially on thin materials.
2. Which welding process is most commonly used in bridge
construction per AWS D1.5?
A. Oxy-fuel welding
B. SMAW (Shielded Metal Arc Welding)
C. GTAW (TIG)
D. Laser welding
B. SMAW (Shielded Metal Arc Welding)
Rationale: SMAW is widely used in structural bridge welding due
to its versatility and suitability for field conditions.
,3. What is the maximum allowable preheat temperature for carbon
steel thicker than 2 inches?
A. 100°F
B. 200°F
C. 300°F
D. 400°F
C. 300°F
Rationale: AWS D1.5 specifies preheat up to 300°F for thick
carbon steel to avoid cracking.
4. What type of joint is typically used for bridge girders?
A. Lap joint
B. Butt joint
C. Tee joint
D. Corner joint
B. Butt joint
Rationale: Butt joints are commonly used in bridge girders to
join plates edge-to-edge.
5. What is the primary purpose of a welding procedure specification
(WPS)?
A. To define visual inspection standards
B. To describe the welding process, parameters, and materials
C. To certify welders
D. To specify paint requirements
B. To describe the welding process, parameters, and materials
Rationale: A WPS ensures consistent, high-quality welds by
providing specific instructions for welding.
6. When welding in the flat position, what is the typical electrode
angle?
A. 0–10°
, B. 15–30°
C. 45–60°
D. 60–75°
B. 15–30°
Rationale: A slight electrode tilt helps control the weld pool and
reduce spatter in flat welding.
7. What is the typical travel speed for SMAW on 1/2-inch steel?
A. 1–2 in/min
B. 3–6 in/min
C. 8–12 in/min
D. 15–20 in/min
B. 3–6 in/min
Rationale: Maintaining proper travel speed ensures adequate
fusion and prevents defects.
8. Which inspection method is required for critical bridge welds?
A. Visual inspection only
B. Ultrasonic testing, radiographic testing, or magnetic particle
testing
C. Surface roughness measurement
D. Hardness testing
B. Ultrasonic testing, radiographic testing, or magnetic particle
testing
Rationale: Critical welds in bridges often require NDT to detect
internal or surface flaws.
9. What is the minimum root opening recommended for a single V-
groove weld on 1-inch steel?
A. 1/16 inch
B. 1/8 inch
C. 1/4 inch
, D. 3/8 inch
B. 1/8 inch
Rationale: A 1/8-inch root opening ensures proper penetration
and fusion in single V-groove welds.
10. What is the primary risk if preheat is not applied on high-
carbon steel?
A. Excessive spatter
B. Increased residual stresses and cracking
C. Weld distortion
D. Porosity
B. Increased residual stresses and cracking
Rationale: Preheating reduces thermal gradients, lowering the
risk of cracking in high-carbon steels.
11. In D1.5, which electrode type is most commonly used for
structural steel?
A. E6010
B. E7018
C. E308L
D. E4043
B. E7018
Rationale: E7018 low-hydrogen electrodes provide strong, crack-
resistant welds suitable for bridge structures.
12. What is the recommended interpass temperature for SMAW
on thick steel?
A. 150–200°F
B. 250–300°F
C. 350–400°F
D. 400–500°F
B. 250–300°F
