Re: [MW:13381] MW: 13373] Failure Of Root bend test of Welding (CS to SS)

it is full gtaw process which i have adopted. it is procedure
qualification not perfomance. welding position 6G.
i have not got the chance to witness the same nor i have sent the
material. we told the lab to send us the specimen.

On 12/31/11, pgoswami <pgoswami@quickclic.net> wrote:
> 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@ <mailto:sympatico.capgoswami@quickclic.net> sympatico.ca,
> pgoswami@quickclic.net
>
>
> _____
>
> 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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--
----------------------
Hareesh K V
+91-9447625012

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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.