Hi
how non-impact tested PQR ( your third PQR) supported with impact tested WPS !!! any thickness limitation they mentioned in WPS??? Need more details on that...
To utilize the advantage of clause in ASME Sec IX-QW- 200.2(f), Multiple WPSs With One PQR or Multiple PQRs With One WPS,
Welding Engineer decides the best possible combinations of various PQRS by supporting in single WPS by considering production weldment requirements, design aspects like service condition, Design / operating temp etc..
Other basic reasons like to combine processes like Root pass from one PQR & Rest from other PQRs etc. or to cover thickness ranges or use multiple consumables combination or additional positions etc.. etc.. in Single WPS
On Wed, Mar 14, 2018 at 7:32 PM, 'Chetan Kapadia' via Materials & Welding <materials-welding@googlegroups.com> wrote:
Dear Ankur,It is general guide line to reduce number of WPS / PQR & technically why increase qualification requirements beyond bare minimum.Over a period of time & with great understanding even code has gone to the extent of recognising concept of sWPS to further reduce the burden of inventing the wheel again & again in advance fast moving technological life.It is this technical philosophy that even the third test piece preserved by you shall be useful in an eventuallity as either1. In case of major repair at site requiring one additional PWHT; The validation by additional PWHT & testing shall become best directional results before proceeding for repair.OR2. In future the same equipment under different design temperature can be tested even prior to accepting an order. That means further validation for different criteria (This type of research & its acceptance from welding, metallurgy & corrosion as well as life cycle of equipment can expand the horizen& value addition to international community.Hope explanation shall be open for new discussion.Thanks & Regards,
C.B.Kapadia,
9892633442
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On Wed, 14 Mar 2018 at 7:17 pm, Ankur Pandey<ankurpandey25@gmail.com> wrote:--Ankur Pandey.Regards,Can someone give me general guidelines what are the usual reasons for use combination of PQR's in single WPS.Dear All,I have a WPS(Impact tested) which is supported by 03 different PQR's. One of PQR is impact tested at -46° C, other at -29°C and third one is not tested for impact. I am not sure what could be the reason for combining these PQR's other than impact requirements.
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