WPS stands for "Welding Procedure Specification," and PQR stands for "Procedure Qualification Record."
A WPS is a document that provides specific welding parameters and procedures to be followed to ensure the quality and integrity of welds in a particular application. It outlines details such as welding processes, materials, joint design, filler metals, preheat and interpass temperatures, welding techniques, and post-weld heat treatment requirements.
A PQR, on the other hand, is a record of the actual welding procedure qualification test. It includes details such as the welding parameters used, the materials welded, the test results, and any deviations from the specified welding procedure.
In simpler terms, a WPS is like a recipe for welding, while a PQR is like the test results showing that the recipe produces a satisfactory weld.