For thickness 5.6 mm x 3 nb pipe it is not required to be PWHT ,
Weldability of X65 Material is well established , We use X65 materials even upto 50mm thick in subsea pipelines for sour service requirmetns, for pipe of your size I suggest use GTAW using 70 Series consumable which meets all requirements X65 Material properties
Best Regards,
Francis lobo
----- Original Message -----
From: rajagopal kannan
To: materials-welding@googlegroups.com
Sent: Thu, 23 Jul 2009 16:24:05 +0530 (IST)
Subject: [MW:2787] Re: Weld Crack at Root trough weld metal
Hi,
Have you done PWHT. These materials normally releases the stress in HAZ after subjecting it to atleast 3 1/2 hours soaking.
Thanks and Regards,
K.RAJAGOPAL
On Tue, Jul 21, 2009 at 5:33 PM, shiva <luvshiv2002@gmail.com> wrote:
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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