Re: [MW:36152] Re: Guidance Required – PQR Base Material & Filler Metal

Dear Mr. Elavaran, 1. Although all three materials are treated as P-No. 1, Gr No. 2 for ASME Section IX qualification, ASME B31.3 fabrication      requirements and the sour-service specification are more restrictive. Your project requires welding of           API 5L X65 Pipe with 535 MPa to A350 LF2 Flange with 485 MPa.            API 5L X65 Pipe with 535 MPa to A860 WPHY 65 Elbow with 620 MPa.          WPHY 65 Elbow with 620 MPa to A350 LF2 Fl with 485 MPa.          Hence, we can consider them under two PQRs.                     PQR-1: API 5L X65 to A350 LF2           PQR-2: API 5L X65 to A860 WPHY 65           Because X65 and WPHY 65 are high-strength materials, while LF2 is substantially lower in strength.           This covers the X65/LF2 combination.             2.  Recommended WPS & PQR          Process GTAW root + SMAW fill/cap          Root filler ER80S-D2          Fill/cap E8018-G H4R (D&H Secheron)          Electrode hydrogen H4R          Electrode storage Manufacturer's controlled procedure          Preheat Established by PQR; typically, ≥100°C is a reasonable starting point          Inter pass ≤200°C initially          PWHT Approximately 595–650°C, with holding time as per B31.3 Table 331.1.1 and the thickness.          Hardness ≤248 HV10 if ADNOC specification applies          Weld Ni ≤1% preferred          Impact Based on B31.3 Table 323.2.2 + ADNOC/project specifications.          Sour service NACE MR0175/ISO 15156 + ADNOC supplement          NDT As specified by B31.3/ADNOC, typically, enhanced tests as per sour-service pressure joints             3.  PQR Tests:           Weld-metal hardness           HAZ hardness           Base-metal hardness where specified           Low hydrogen consumables           Consumable chemistry control           Ni control           SSC resistance requirements were specified by ADNOC           Appropriate NACE MR0175/ISO 15156 compliance           Any ADNOC-specific sour-service testing.       NACE MR0175/ISO 15156 requires welding procedure qualification for sour service to address weld hardness in carbon steels.      Trust the above details may be of help to you.    C Sridhar.  -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

On Thu, 3 Sept 2026 at 23:48, ELAVARASAN SARANGAPANI <elavarasan1861994@gmail.com> wrote:

Dear Sir,

Please advise on the PQR base material combination, filler metal selection, and PWHT requirement for 20 mm thickness, as per ASME B31.3, for the following joints:

• API 5L X65 Pipe → A350 LF2 Flange
• API 5L X65 Pipe → A860 WPHY 65 Elbow
• A860 WPHY 65 Elbow → A350 LF2 Flange

All materials are understood as P-No. 1, Group No. 2 as per ASME Section IX. The service is ADNOC sour service / H₂S.

Kindly advise the suitable PQR base material combination, filler metal, PWHT requirement, and applicable Charpy / sour-service testing requirements

On Thu, 3 Sep 2026 at 10:00 PM ELAVARASAN SARANGAPANI <elavarasan1861994@gmail.com> wrote:

Dear Sir,

Please advise on the PQR base material combination and filler metal selection for the following joints:

● API 5L X65 Pipe → A350 LF2 Flange

● API 5L X65 Pipe → A860 WPHY 65 Elbow

● A860 WPHY 65 Elbow → A350 LF2 Flange

21 mm thickness 

All are understood as P-No. 1, Group No. 2 as per ASME Section IX. The service is ADNOC sour service / H₂S.

Kindly advise the suitable PQR base material combination, filler metal, and any required Charpy / sour-service testing. PWHT requirement 

Best Regards,
Elavarasan

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