Re: [MW:13354] Oxygen level in purging gas during welding of duplex stainless steel

Dear Mr Martin,

As we done here SDSS fabrication we are
following client Spec, Only up to completion of root pass, Oxygen
level shall be below -100 ML/Ml3, During welding if exceed 500 Ml/Ml3
then welding has to stop,this process follow up to three layer.

Depending upon you thickness of deposit. After three layer heat input
cannot oxidize the root, It optional u can maintain up to 10 mm thick
welding ,if pipe thickness is more than 10mm u can stop backing gas .

Regards

Madhu

On 12/28/11, Martin Prad <martin_prad@hotmail.com> wrote:
>
> Hi friends,
>
> I have 2 different specification which the requirements are different for
> the oxygen level in purging gas during the welding of super duplex pipe.
>
> One of them calls for 25 ppm (0.0025%) another one calls for 5000 ppm
> (0.5%). Could you please shed some light on this as which one is up to the
> standard with references?
>
> Thanks,
> Martin.
>
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