AWS Certified Welder Bridge Welding D1.5
Exam Questions With Correct Answers
(Verified Answers) Plus Rationales 2026 Q&A |
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1. What does AWS D1.5 primarily cover?
a) Structural steel in buildings
b) Bridge welding requirements
c) Pipeline welding procedures
d) Shipbuilding welding standards
b) Bridge welding requirements
Rationale: AWS D1.5 is the code specifically developed for
welding steel structures used in bridge construction, including
qualification, inspection, and procedures.
2. Which type of steel is most commonly used in bridge welding?
a) Aluminum
b) Carbon steel
c) Stainless steel
d) Copper
, b) Carbon steel
Rationale: Carbon steel is commonly used in bridges due to its
high strength, weldability, and cost-effectiveness compared to
alloys or non-ferrous metals.
3. The primary purpose of preheat in bridge welding is to:
a) Melt the base metal
b) Reduce hydrogen-induced cracking
c) Speed up cooling
d) Improve surface finish
b) Reduce hydrogen-induced cracking
Rationale: Preheating slows the cooling rate, which reduces the
risk of hydrogen-induced cracking, particularly in thick, high-
strength steels.
4. Which welding process is most commonly used for structural
bridge welding?
a) SMAW (Stick)
b) TIG (GTAW)
c) MIG (GMAW)
d) Oxy-fuel welding
a) SMAW (Stick)
Rationale: Shielded Metal Arc Welding (SMAW) is widely used
, for bridge welding because of its versatility, suitability for field
conditions, and compliance with D1.5.
5. What is the minimum electrode diameter for a 1-inch thick steel
member using SMAW?
a) 1/16 inch
b) 3/32 inch
c) 1/8 inch
d) 5/32 inch
c) 1/8 inch
Rationale: AWS D1.5 specifies electrode sizes based on base
metal thickness to ensure adequate deposition and penetration;
1/8 inch is suitable for 1-inch thick carbon steel.
6. Which weld joint type is preferred for bridge girders?
a) Butt joint
b) Lap joint
c) Tee joint
d) Corner joint
a) Butt joint
Rationale: Butt joints provide full penetration and maximum
strength, which is essential in bridge girders subjected to high
loads.
, 7. The maximum interpass temperature in bridge welding helps to:
a) Accelerate welding speed
b) Prevent overheating and loss of mechanical properties
c) Avoid slag inclusion
d) Ensure better appearance
b) Prevent overheating and loss of mechanical properties
Rationale: Maintaining interpass temperature limits prevents
weakening of the heat-affected zone (HAZ) and reduces residual
stresses and cracking.
8. Which type of inspection is mandatory according to AWS D1.5?
a) Visual inspection
b) Ultrasonic testing only
c) Radiographic testing only
d) Magnetic particle testing only
a) Visual inspection
Rationale: Visual inspection is mandatory for all welds to ensure
compliance with dimensions, profiles, and surface quality before
performing any nondestructive testing.
9. Which welding position is commonly used for bridge field welds?
a) Flat (1G/1F)
b) Overhead (4G/4F)
Exam Questions With Correct Answers
(Verified Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. What does AWS D1.5 primarily cover?
a) Structural steel in buildings
b) Bridge welding requirements
c) Pipeline welding procedures
d) Shipbuilding welding standards
b) Bridge welding requirements
Rationale: AWS D1.5 is the code specifically developed for
welding steel structures used in bridge construction, including
qualification, inspection, and procedures.
2. Which type of steel is most commonly used in bridge welding?
a) Aluminum
b) Carbon steel
c) Stainless steel
d) Copper
, b) Carbon steel
Rationale: Carbon steel is commonly used in bridges due to its
high strength, weldability, and cost-effectiveness compared to
alloys or non-ferrous metals.
3. The primary purpose of preheat in bridge welding is to:
a) Melt the base metal
b) Reduce hydrogen-induced cracking
c) Speed up cooling
d) Improve surface finish
b) Reduce hydrogen-induced cracking
Rationale: Preheating slows the cooling rate, which reduces the
risk of hydrogen-induced cracking, particularly in thick, high-
strength steels.
4. Which welding process is most commonly used for structural
bridge welding?
a) SMAW (Stick)
b) TIG (GTAW)
c) MIG (GMAW)
d) Oxy-fuel welding
a) SMAW (Stick)
Rationale: Shielded Metal Arc Welding (SMAW) is widely used
, for bridge welding because of its versatility, suitability for field
conditions, and compliance with D1.5.
5. What is the minimum electrode diameter for a 1-inch thick steel
member using SMAW?
a) 1/16 inch
b) 3/32 inch
c) 1/8 inch
d) 5/32 inch
c) 1/8 inch
Rationale: AWS D1.5 specifies electrode sizes based on base
metal thickness to ensure adequate deposition and penetration;
1/8 inch is suitable for 1-inch thick carbon steel.
6. Which weld joint type is preferred for bridge girders?
a) Butt joint
b) Lap joint
c) Tee joint
d) Corner joint
a) Butt joint
Rationale: Butt joints provide full penetration and maximum
strength, which is essential in bridge girders subjected to high
loads.
, 7. The maximum interpass temperature in bridge welding helps to:
a) Accelerate welding speed
b) Prevent overheating and loss of mechanical properties
c) Avoid slag inclusion
d) Ensure better appearance
b) Prevent overheating and loss of mechanical properties
Rationale: Maintaining interpass temperature limits prevents
weakening of the heat-affected zone (HAZ) and reduces residual
stresses and cracking.
8. Which type of inspection is mandatory according to AWS D1.5?
a) Visual inspection
b) Ultrasonic testing only
c) Radiographic testing only
d) Magnetic particle testing only
a) Visual inspection
Rationale: Visual inspection is mandatory for all welds to ensure
compliance with dimensions, profiles, and surface quality before
performing any nondestructive testing.
9. Which welding position is commonly used for bridge field welds?
a) Flat (1G/1F)
b) Overhead (4G/4F)
