D1.5 Practice Exam Questions And

AWS Certified Welder – Bridge Welding D1.5 Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the primary purpose of preheating steel before welding in

bridge construction?

• To increase deposition rate
• To reduce residual stress
• To minimize hydrogen-induced cracking
• To prevent oxidation
• To minimize hydrogen-induced cracking

Rationale: Preheating reduces the cooling rate of the weld,

minimizing hydrogen entrapment and the risk of cold cracking.

• Which welding process is most commonly used for structural steel

bridge fabrication? 1 / 4

• Oxy-fuel welding
• SMAW (Shielded Metal Arc Welding)
• GTAW (Gas Tungsten Arc Welding)
• FCAW (Flux-Cored Arc Welding)
• SMAW (Shielded Metal Arc Welding)

Rationale: SMAW is widely used for bridge construction due to its

portability, adaptability, and ability to weld thicker steel sections.

• In D1.5, what is the maximum allowed preheat temperature for

carbon steel thicker than 3/4 inch?

A) 100°F

B) 150°F

C) 200°F

D) 250°F

C) 200°F

Rationale: D1.5 specifies maximum preheat to control hydrogen

cracking while ensuring proper weld fusion.

• Which type of joint is preferred for bridge stringer welding?
• Lap joint
• Butt joint
• Tee joint
• Corner joint
• Butt joint 2 / 4

Rationale: Butt joints provide full penetration welds, essential for

structural integrity in bridge components.

• When welding bridge components, the term “backstep technique”

refers to:

• Welding from the root outward
• Welding in short segments opposite the direction of travel
• Using a higher current at the start
• Preheating each segment before welding
• Welding in short segments opposite the direction of travel

Rationale: Backstep welding reduces residual stresses and distortion

in large structural members.

• Which electrode classification is suitable for welding bridge steels with

tensile strength of 70 ksi?

A) E6010

B) E7018

C) E308L

D) E316L

B) E7018

Rationale: E7018 electrodes provide low-hydrogen, high-strength

welds compatible with bridge structural steels.

• Which of the following is the most critical inspection for welded bridge

components?

• Visual inspection 3 / 4

• Radiographic inspection
• Ultrasonic inspection
• Magnetic particle inspection
• Visual inspection

Rationale: While all inspections are important, visual inspection is

required for acceptance and detecting obvious weld defects.

• What is the primary reason for controlling interpass temperature in

multi-pass welds?

• To increase penetration
• To reduce distortion
• To prevent hydrogen cracking
• To improve slag removal
• To prevent hydrogen cracking

Rationale: Limiting interpass temperature prevents excessive heat

build-up that can increase the risk of cracking in high-strength steels.

9. The term “stringer” in bridge welding refers to:

• A type of electrode
• A longitudinal support member
• A temporary welding jig
• A weld defect
• A longitudinal support member

Rationale: Stringers run along the length of a bridge to support the

deck and transfer loads to the floor beams.

• / 4