What should a WPS include according to AWS D1.1?

The correct answer emphasizes the comprehensive requirements for a Welding Procedure Specification (WPS) as outlined in the AWS D1.1 code. A WPS is a crucial document that serves as a guideline for welding operations. It should include detailed information pertaining to the specific parameters necessary for achieving sound welds.

Specifically, the WPS must detail the base metal type to ensure compatibility and proper weld integrity. It also needs to specify the filler material to ensure the strength and composition match the requirements of the base materials. Including the welding process is vital, as different processes (like SMAW, GTAW, etc.) come with distinct parameters and techniques. Preheating requirements are crucial for managing the thermal effects on the material, especially in higher carbon steels, while post-weld treatments may be necessary to relieve stresses or enhance mechanical properties.

Including costs and timelines, as suggested in one of the other choices, does not pertain to the technical specifics needed in a WPS; rather, this information is more administrative and project management-focused. The options that suggest only limited details, like just the base metal type and filler material or focusing solely on welding techniques, do not encapsulate the full scope that a WPS necessitates for ensuring successful welding practices according to