of oxygen in the purge dam, therefore the purity of argon use for
purging is important. If the spec calls for 500 ppm of oxygen you need
to use 99.999% of argon.
The purpose of purging is to eliminate the oxidization of root bead
from inside thus to maintain the corrosion resistance of the welding.
Please take note also on the spec requirement of the removal of the
purge whether the purge can be removed after certain passes.
On 4/16/10, ravishankar menon <ravimenakath@yahoo.co.in> wrote:
> Dear all,
> Usually purging is necessry to eliminate presence of oxygen while doing low
> alloy steels and SS materials,To eliminate oxides inside the pipe weld
> beads, Cofirm purging should be with nitrogen and mixture of hydrogen and
> nitrogen or organ well before the welding to remove oxygen in side the
> pipe.
>
> Ravishanker,
>
>
>
>
> ________________________________
> From: qaqcmpm <mamujeebali@gmail.com>
> To: Materials & Welding <materials-welding@googlegroups.com>
> Sent: Thu, 15 April, 2010 11:27:58 AM
> Subject: [MW:4843] Ar purge for Low Alloy steel
>
> One of our client specn asks for argon purging of root pass (pressure
> retaining welds) for GTAW for Low alloy Cr-Mo steel? why it is
> required any idea?
>
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