[MW:2772] RE: 2763] Re: 2748] Weld Crack at Root trough weld metal

From the data you have given it seems that Preheating is reqd to be carried. For all such high strength weld, ii) some time it is better to carry post heating also. This way you can maintain lower hardness.

Regards

Hegde

-----Original Message-----
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Yadav Shiva
Sent: Wednesday, July 22, 2009 10:20 AM
To: materials-welding@googlegroups.com
Subject: [MW:2763] Re: 2748] Weld Crack at Root trough weld metal

Dear all,
Can you please find any solution for Crack. all test
are okay except Hardness . Can you explain with technical reasons why
it has happened . ??

Dia of pipe 3"
thickness 5.6mm,
Sour service,
max hardnes required 248 HV,
tested value of crack weld - 351,329 root and in caping 286 HV.
Electrode root 8010,
fill and hot 8018.

On 7/21/09, Minal Patel (Sorge's Welding) <mpatel@metalcare.com> wrote:
> E 8010/E8018 is too brittle joints after welding, those are good if you want
> to obtain hard/brittle surface on weld. 7010/7018 will be good for those
> material
>
>
>
>
>
> From: materials-welding@googlegroups.com
> [mailto:materials-welding@googlegroups.com] On Behalf Of Antonio Ruscitto
> Sent: Tuesday, July 21, 2009 9:29 AM
> To: Materials & Welding
> Subject: [MW:2748] Weld Crack at Root trough weld metal
>
>
>
> 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.
>
> *********************************************************************
>
> ¡IMPORTANTE!
>
> Para evitar accidentes por inhalación de monóxido de carbono:
>
> - Mantenga los ambientes ventilados en forma permanente.
>
> - Revise que la llama sea color azul y uniforme.
>
> - Instale y haga revisar periódicamente sus artefactos sólo a través de
> gasistas matriculados.
>
> Recuerde que los artefactos a gas pueden emitir Monóxido de Carbono: un gas
> altamente tóxico e imperceptible.
>
> Más consejos en http://www.metrogas.com.ar
>
> *********************************************************************
>
> Este mensaje es privado y confidencial y va dirigido sólo al destinatario
> indicado. Si lo ha recibido por error, por favor avísenos inmediatamente vía
> e-mail a error-mail@metrogas.com.ar y tenga la amabilidad de eliminarlo de
> su sistema. La utilización o divulgación de su contenido puede importar la
> comisión de un delito. No copie, reproduzca o divulgue -en forma parcial o
> total- su contenido. Cualquier opinión contenida, es exclusiva de su autor y
> no representa la opinión de MetroGAS S.A. - Muchas gracias.
>
> This message is private and confidential and it is only intended for the
> addressee named above. If you have received this message and it is not
> addressed to you, please advise us immediately at error-mail@metrogas.com.ar
> and kindly remove it from your system. The use or disclosure of its contents
> may be regarded as an offense. Do not copy, reproduce or disclose them,
> either partially or fully. Opinions are the exclusive responsibility of the
> author and do not represent the opinion of MetroGAS S.A. - Thank you.
>
> :: http://www.metrogas.com.ar
>
>
>
> <BR
>
>
> >
>

--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
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.
-~----------~----~----~----~------~----~------~--~---