[MW:2783] Re: 2742] Weld Crack at Root trough weld metal

Pl check the preheat used and use 70 series electrodes for root and rest 80 series which will result in low hardness which will meet the nace requirements also. Hardness for root 248 HV and 275 HV for cap

Best Regards,
Francis Lobo
----- Original Message -----
From: Ali Varmazyar <av-ssg@msa.ir>
To: materials-welding@googlegroups.com
Sent: Wed, 22 Jul 2009 09:10:40 +0530 (IST)
Subject: [MW:2757] RE: 2742] Weld Crack at Root trough weld metal

Surry, I forget to talk about your service. if your service is sour then you
must consider Nace MR0175/ISO15156-2 requirements too.

Best Regards

A. Varmazyar

MSA -Welding Engineering Department
Msa,Arak,Markazi,IRAN - P.O. 148
Tel.: +988612172725~6
Fax: +988612172702

-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of shiva
Sent: Tuesday, July 21, 2009 6:04 PM
To: Materials & Welding
Subject: [MW:2742] Weld Crack at Root trough weld metal

We are using API 5L X65 grade material for sour environment. With
reference to our WPS we used (Ador electrodes) e 8010 for root and
8018 for hot fill pass.
We took NDT and its okay. But after 1 month 4 weld joints crack. We
checked the macro hardness for existing and cracked joint . There was
a high hardness eg 351, 329 on root and in weld metal cap side 280
above. Which is very high.

Can you please tell me for this material what type of electrodes to be
used? And why this occoured ?? And what may be possible reason for
this occourance?

Regards,
Y.C.Shiva,
QA/QC Engineer,
+974 6166465
Doha Qatar.

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