Which standard governs the fabrication requirements for steel bridge structures?

• A. AWS D1.1
• B. AWS D1.5
• C. AWS A3.0
• D. ASME IX

Answer: (B)

The essential idea is recognizing which code specifically governs how steel bridges are fabricated and welded. For bridge projects, the controlling document is AWS D1.5, the Structural Welding Code for Bridges. This standard lays out the requirements for welding procedures, weld quality, fit-up, inspection, materials, and workmanship tailored to bridge fabrication, including considerations for fatigue and long-term performance under highway loading.

In contrast, AWS D1.1 covers general structural steel welding but isn’t bridge-specific, AWS A3.0 provides terms and definitions rather than fabrication rules, and ASME IX focuses on welding procedure and welder qualifications for pressure vessels, piping, and related components rather than bridges.