Friday, April 16, 2010

Re: [MW:4823] Ar purge for Low Alloy steel

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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