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[MW:27516] Combination of PQR in same WPS

By Materials & Welding
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.

Can someone give me general guidelines what are the usual reasons for use combination of PQR's in single WPS.

Regards,
Ankur Pandey.

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