Re: [MW:16903] CO2 purging during TIG welding of CS service line

On safety angle it is ok and also it will affect more of welding as
purging and its density is also higher than air and it will not have
upward flow.
Pandithan
Welding Consultant

On 2/28/13, Lalu r p <lalucpt@gmail.com> wrote:
> 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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