[MW:2753] Re: Weld Crack at Root trough weld metal

Yes the PQR & WPS Was Qualified. But  while doing PQR the hardness value in weld metal was 234HV  heighest, which was near to the accepted Maximum value of 248 HV.  thickness is 5.6mm and diameter 3"

On Tue, Jul 21, 2009 at 6:29 PM, Antonio Ruscitto <ARUSCITT@metrogas.com.ar> wrote:

Sorry IŽm forget to ask you whatŽs the thicknes of pipe?

Antonio Ruscitto

>>> "Antonio  Ruscitto" <ARUSCITT@metrogas.com.ar> 21/07/2009 11:37:31 am >>>

The WPS was qualificated? was it OK? WhatŽs kind messure value was took (Brinnel, Vickers)?

I make a WPS with first pass with E7010 and the hot pass with E8018 (Up), but maybe it better make with 100°C of preheat, and the time between first and second pass it more shorter possible after clen the fisrt pass.

Antonio Ruscitto

>>> shiva <luvshiv2002@gmail.com> 21/07/2009 10:33:36 am >>>

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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