AWS D1.1 is primarily for which type of welding?

• A. Boiler and pressure vessels.
• B. Structural welding.
• C. Automotive welding.
• D. Pipeline welding.

Answer: (B)

AWS D1.1 is the Structural Welding Code for Steel. It is the primary standard that governs how welds are designed, performed, and inspected for structural steel members used in construction—things like building frames, bridges, and other load‑bearing structures. The code focuses on ensuring the strength, safety, and quality of welded connections in structural applications, including requirements for welding processes, procedure and welder qualifications, fit-up, workmanship, and inspection criteria.

That’s why this answer fits best: the code is specifically intended for structural welding in steel construction, not for boilers and pressure vessels (which follow codes like the ASME BPVC), pipelines (often covered by API 1104 and related standards), or automotive welding (which uses different, domain-specific standards).