What is the typical use of a PQR in welding?

The typical use of a Procedure Qualification Record (PQR) in welding is primarily to define welding procedures. A PQR is a crucial document within the welding quality assurance framework that demonstrates the ability of a welding procedure to produce a sound weld under specified conditions. It records the welding parameters, base materials, filler materials, and any specific techniques used during the welding process.

By establishing a PQR, an organization ensures that the welding processes are capable of meeting the desired quality standards set forth by the applicable codes, such as AWS D1.1. This documentation is essential for qualifying a welding procedure specification (WPS), which provides detailed instructions on the welding process.

The other options, while related to quality and performance in welding, do not directly represent the primary purpose of a PQR. Evaluating base material quality, determining weld thickness, and testing joint preparation cleanliness are important aspects of the overall welding process, but they do not encapsulate the main function of the PQR. The PQR is focused specifically on validating the procedure used to weld materials together, ensuring consistency and structural integrity in the final product.