[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.
>
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