Which AWS code is typically used as the structural welding code for steel in the United States?

• A. AWS D3.0 Structural Welding Code – Aluminum
• B. AWS D1.1 Structural Welding Code – Steel
• C. AWS D14.1 Structural Welding Code – Stainless
• D. AWS D1.3 Structural Welding Code – Bridge

Answer: (B)

The main concept is identifying the standard code that governs how steel structures are welded in the United States. The Structural Welding Code for steel is AWS D1.1 Structural Welding Code – Steel. This code sets the common requirements for welding procedures, welder and inspector qualifications, filler metal choices, joint designs, and acceptance criteria used across most structural steel projects like buildings and frames. It’s the go-to reference that project specs and building codes rely on when steel fabrication and construction are involved. Other codes in the list address different materials or more specialized applications—aluminum, stainless steel, or bridges—so they don’t serve as the general structural code for steel.