What must a contractor provide to demonstrate compliance with AWS D1.1?

The correct response underscores the importance of demonstrating compliance with the AWS D1.1 code, which sets requirements for welding and inspection practices in structural steel. To establish adherence to this code, a contractor must provide specific documentation that directly relates to the procedures and quality control measures they follow.

The essential components include Welding Procedure Specifications (WPS), which outline the parameters for welding processes; Quality Control (QC) records that track the effectiveness of welding practices; and inspection reports that provide evidence of conformity with the stipulated standards during various phases of a project. This comprehensive documentation ensures that all aspects of the welding process have been carefully controlled and evaluated in accordance with AWS D1.1 requirements.

In contrast, while the other options may be relevant in specific contexts, they do not collectively fulfill the overarching requirement of showing compliance with AWS D1.1 as clearly as the appropriate documentation does. A list of materials is important but does not demonstrate compliance with welding procedures. A structural engineering analysis report may be useful for design verification but is not directly tied to welding compliance. Historical data on previous projects can provide insights but does not represent current adherence to the standards necessary for the ongoing work according to AWS D1.1.