A WPS is a document that provides detailed instructions and parameters for performing a welding operation. It specifies the welding process, welding materials, joint design, preheat and interpass temperatures, welding techniques, post-weld heat treatment (if required), and other essential variables.
A PQR is a record of the test results obtained during the qualification of a welding procedure. It documents the specific welding variables used during the qualification tests, as well as the results of any required testing.
A WPQ, or Welder Performance Qualification, is a certification that confirms a welder's ability to produce welds meeting specified standards. This qualification is typically required in industries where welding plays a critical role, such as construction, manufacturing, aerospace, and oil and gas.
