Which document should be available to confirm the certified welder's qualifications?

To confirm a certified welder's qualifications, the qualified welder's report is the most appropriate document. This report contains detailed information about the welder’s qualifications, including the tests they passed and the standards they meet according to applicable codes. It effectively serves as proof that the welder is deemed competent and compliant with industry regulations and requirements.

The qualified welder's report is specifically designed for this purpose, ensuring that there is a formal record of the welder's capabilities and adherence to the specified welding standards. This documentation can be crucial during inspections and audits, illustrating that the work performed by the welder meets safety and quality standards.

The welding log, while it may provide a record of welding activities, does not necessarily confirm qualifications or competencies of the welder. The welder's personal certification, although it could indicate training, does not typically offer comprehensive evidence of their qualifications as defined by the necessary codes or standards for specific projects. The installation manual serves to provide instructions on equipment setup and operation, not a verification of a welder’s qualifications.