The AWS code book covers metal thickness from what minimum to what maximum?

The correct answer reflects the range of metal thickness that the AWS D1.1 code covers for steel welding. The American Welding Society (AWS) D1.1 code includes specifications for various welding processes and requirements for materials of differing thicknesses.

The minimum thickness specified in the code is significant because it establishes the threshold for effective weldability and structural integrity. The upper limit, labeled as "unlimited," indicates that the code is applicable for thicker materials without a defined maximum thickness, ensuring it can address a wide range of structural applications.

Understanding this range is crucial for welders, engineers, and inspectors, as it helps them apply appropriate welding procedures, techniques, and considerations for successful fabrication and structural performance.