Which Standard contains requirements for the fabrication of steel bridges?

• A. AWS D1.5
• B. AWS D1.1
• C. CSA W59
• D. ISO 3834

Answer: (A)

The key idea is that there is a welding code specifically tailored for building and fabricating steel bridges. AWS D1.5 is the Bridge Welding Code, and it embeds the requirements unique to bridge fabrication—covering weld design, materials, welding procedures, procedure and welder qualifications, fabrication practices, inspection, and quality control as they apply to bridges and bridge components. This bridge-focused scope is what sets it apart from other welding standards.

AWS D1.1, while important for general structural welding of steel (often used for buildings and other structures), is not dedicated to bridges and lacks the bridge-specific provisions. CSA W59 governs welding of steel in Canada but isn’t the bridge-specific code for North American bridge fabrication. ISO 3834 provides broad quality requirements for welding across industries, not the specialized bridge fabrication rules found in AWS D1.5.

So, for steel bridge fabrication requirements, the applicable standard is the Bridge Welding Code.