Difference between WPS and pqr

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WPS is a document that provides guidelines for welding processes, while PQR is a record of the actual test results from welding procedure qualification tests.

WPS stands for Welding Procedure Specification, it provides detailed instructions on how to perform a specific welding process.
PQR stands for Procedure Qualification Record, it documents the actual test results from welding procedure qualification tests.
WPS is used as a reference for welders to ensure consistency in welding processes, while PQR is used to demonstrate that the welding procedure meets the required standards.
An example would be a WPS specifying the welding parameters for joining two pieces of metal, while the corresponding PQR would show the test results confirming the weld's strength and quality.