not required as long you have a qualified PQR without purging.
Generally purging is recommended for materials with Cr >2.25% (refer
API 582).
On Sun, Aug 14, 2011 at 11:24 AM, sri lakshmi <2002mgs@gmail.com> wrote:
> back purge is must as it prevents oxidation which will result in loss of
> joint strength.
> regards
>
> On Sat, Aug 13, 2011 at 9:24 PM, Endri Prasetyo <endri.prasetyo@gmail.com>
> wrote:
>>
>> Dear Experts,
>> When we join the material of 12Cr1MoVG by TIG welding (root pass), is it
>> possible/acceptable if we don't apply gas purging for back side?
>> Please advise.
>> Regards,
>> Endri
>>
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