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multiple PQR's

multiple PQR's

multiple PQR's

(OP)
Using API 1104, if welding from group b (x52) to group c (x70) the welding procedure for the higher strength is to be used.  My question is about the PQR.  The PQR is only for X70 but do I need a PQR specifically designed for:

1. welding x52 to x70?  
2. Or is the PQR for x70 good enough to cover both grade  
   groups?
3. Or do I just need to attach seperate PQR's one for the  
   x52 and one for x70?

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