Which standard covers welding requirements for carbon and low-alloy steels?

The correct answer focuses on AWS D1.1, which is the American Welding Society standard specifically designed for welding requirements related to carbon and low-alloy steels. This standard provides guidelines for various welding processes, including the qualification of welders, the performance of welds, and the inspection and testing of welded joints.

AWS D1.1 is widely recognized in the industry as a comprehensive document governing the structural welding of steel. It covers much more than just the materials—it addresses joint design, weld quality, and environmental conditions that can affect welding. This thorough approach is essential for ensuring the integrity and durability of welded structures made from carbon and low-alloy steels.

In contrast, other AWS standards focus on different materials or applications. For instance, AWS D1.6 pertains to stainless steel, AWS D2.1 addresses welding of aluminum structures, and AWS D3.2 deals with welding thermoplastics. Each of these standards serves its specific purpose and audience, highlighting the importance of selecting the appropriate standard that matches the materials and conditions of a given welding project.