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difference between wps & pqr
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Answer Posted / viviyan
pWPS---->PQR----->WPS------>WPQ
This would be the preferred sequence. Based on literature survey, consumables available, feasible process(es), etc. a proposed WPS is made and a procedure coupen is welded based on the pWPS. The PQR coupen is welded and the various variables(parameters) noted. The Procedure coupen is then tested to check the integrity of the joint and suitability to the application based on acceptance criteria spelt out in the specification(s) and code(s). Once tested ok, the PQR is documented. Based on the PQR , a WPS is generated based on the limits specified for the essential, supplementary and non essential variables. The WPS is now a work instruction and can be used as is to provide information to the welder/welding supervisor on the variables for the production welding. The welder(s)/welding operator(s) is/are qualified for a range of variables, mind it that the welder essential variables are diffferent as compared to those for a PQR. He is /They are tested to requirements as per specification and code(Normally lessesr tests as compared to the PQR- In some cases only NDE would suffice for a welder qual) and then a WPQ/WPQs is generated. A PQR has no age or time limit for use(at least as per both ASME Section IX or AWS D1.1), so even if the PQR qualified to a 1960 edition it would still be valid with all the changes in code. However a WPS has to be generated to the latest revision or the revision of the code agreed between the manufaturer and the buyer at the time of signing the contract. However a WPQ has got a validity period as can be expected since it is a test of the welder performance. Thus a continuity has to be maintained for the welder as per code or specification to show the welder has been continuously using that process.
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