This article talks about procedure qualification record (PQR) based on requirements of ASME Code Section IX.

The purpose of qualifying a WPS is that to indicate joining process proposed for production welding has required mechanical property.

The WPS is written by knowledgeable person but needs to be tested to ensure the produced weld based on WPS has required mechanical property. When the WPS provided, then a test sample must be prepared and welded. All welding variable must be recorded during the welding. Please note in WPS you have the range but you will not have a range in the PQR, and you need to record a single value for each specified variable.