Hi Hareesh,
As per the details below the welding process adopted was GTAW. Did you have chance to explore fractured area ?. The possibility could be any lack of fusion or incomplete penetration (suck back). As the pipe is of 6" OD, the root would be fully open for visual inspection after the root pass.
A through visual inspection would be advisable before proceeding for the subsequent passes.As this is a procedure qualification(not a performance), you have all the means to correct any welding defect in the root run.
The mechanical properties looks fine, no issues.
I hope the next time would be better.
Thanks.
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist & Consultant
Ontario,Canada.
Email-pgoswami@sympatico.ca,
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of HAREESH K V
Sent: Saturday, December 31, 2011 12:05 AM
To: materials-welding@googlegroups.com
Subject: [MW:13373] Failure Of Root bend test of Welding (CS to SS)
Dear Sir,
Advance happy new year to all.
I have done a PQR(As per ASME Sec ix) of 6", Sa106 GrB to Sa 312 TP 316L. One of the root bend of the same failed.
Consumable used: ErNiCr-3.
Tesile strength T1=507 and T2=514MPa(Min Rqd 415MPa);
Hardness:
Sa106 Gr B side p.metal: 160,151,147
Sa106 Gr B side HAZ:160,156,156
Weld: 193,170,165
Sa312 TP316L P.metal: 175, 175,181
Sa312 TP316L HAZ: 165,151,151
Face bends are satisfactory.
One root bend satisfactory.
Please give me the possible reasons and the precautions on further doing the PQR.
Regards,
Hareesh K V
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