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A Procedure Qualification Record (PQR) is the record of the actual weld test parameters used.It is the founding document as far as procedures are concerned and is used to produce welding procedure specification sheets (WPS) for production welds. It is company dependent and never expires.
A Welding Procedure Specification (WPS) is the formal written document describing welding procedures, which provides direction to the welder or welding operators for making sound and quality production welds as per the code requirements. The WPS is also used for submittal to clients, engineers or inspectors.
A WPS is based on the allowable variables of the approved PQR and is required for allproduction welds. Any number od these can be written from a single PQR without further testing as long as they comply. As with any document the procedures can only work if they are used correctly in accordance with the parameters detailed.
As per the PQR the WPS is company dependent and never expires. A WPS is a legal copyrighted document which is supported by a Procedure Qualification Record (PQR).