Weld overlay PQR UNS 31254 (P8 Gr 4) To overlay SA516 GR70 overlay by ER Ni Cr MO-3

[atul jha]

Dear sir

I Have to establish a PQR as per below detail :-

Material 1 : SA 516 gr 70 overlay of 3 mm by NiCrmo-3 ( done at vendor works).

Material 2 : A182 Gr F 44 UNS S 31254.

Code of construction ; B31.3.

Pwht : none 

I have to weld this joint in our plant as per attach figure.

QUERY: can a PQR with P1 to P8 by nicrmo-3 will serve the purpose OR I have to establish a PQR P1 ( cladded by nicrmo-3 ) to P8 welded by NicrMO-3 . I want to go with 1 st case

Does change in welding process also affect the above choice .

Kindly note that these vessel are for ARAMCO.

Kindly explain and guide me accordingly.

Regards

Atul jha 

B.E in welding Technology.

[james gerald]

Weld the joint as per attached configuration as a single vee joint using alloy filler wire/electrode such as ER/E NiCrMo3 for the complete joint.

Thanks & Regards

J.Gerald Jayakumar

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[james gerald]

Regarding PQR Qualification,

Weld a clad plate of similar composition (as production Joint) with 254 SMO Alloy plate (based on production joint dissimilar thickness allowed)

Thanks & Regards

J.Gerald Jayakumar

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