Re: [MW:16900] CO2 purging during TIG welding of CS service line

Dear sir
For C and C-Mn steels it is possible to make satisfactory welds
without back purge.But normally in this type of situations the line
has to be purged with CO2 or NITROGEN before going to a hot work
operation.but during socket welding it is permissible to prevent the
fire at normal pressure.

On 2/28/13, Dinesh <som.din@gmail.com> wrote:
> Dear sir,
>
>
>
> Please can you verify in project specification for co2 purging on GTAW
> process
>
> .As well need, might be this occurrence of co2 purging to avoid an any
> oxidizer to help in it to catch fire during welding.
>
>
>
> regards
>
> Dinesh
>
>
>
> From: materials-welding@googlegroups.com
> [mailto:materials-welding@googlegroups.com] On Behalf Of Vino Varghese
> Sent: Thursday, February 28, 2013 7:34 AM
> To: materials-welding@googlegroups.com
> Subject: Re: [MW:16892] CO2 purging during TIG welding of CS service line
>
>
>
> Dear Sir,
>
>
>
> What does your WPS states?
>
>
>
> Regards, Vino
>
> On Thu, Feb 28, 2013 at 5:52 AM, K.M Hrishikesan <hrishikm07@gmail.com>
> wrote:
>
> Our safety team recommends CO2 purging during repair welding of a 2" socket
> weld joint of a CS line( consumable- ER 70S-2 process GTAW). Traces of
> oil
> and toxic gases have already been removed from the loop by flushing and
> CO2 purging. Still, as a precautionary measure, CO2 puging is being
> recommended during welding also
>
>
>
> Does it have any impact on the weld quality?
>
>
>
> Thanks
>
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