Dears,
-- Your material is stainless steel,deletion of gas backing is essential variable,but addition of backing material is non essential variable,if we using backing ring then whats the purpose of gas backing.
I THINK NO NEED FOR GAS BACKING.
On Sun, Jun 3, 2012 at 3:57 PM, CHINTUKUMAR GANDHI <cgandhi1975@yahoo.com> wrote:
P-No. 10K, P-No. 51 through P-No. 53, and P-No. 61 through P-No. 62 metals, the deletion of backing gas or a change in the nominal composition of the backing gas from
an inert gas to a mixture including non-inert gas(es). is the Essential variable for GTAW process.
Basis on the above, you can use WPS with backing ring without gas backing (purging) excepting for welding of the above P Nos.
Thanks & regards,
C. R. GANDHI
(Manager- Q. A./ Q.C.)
--- On Fri, 6/1/12, senins welo <senins054@gmail.com> wrote:
From: senins welo <senins054@gmail.com>
Subject: [MW:14437] BACKING RING NEED BACK GAS PURGING
To: materials-welding@googlegroups.com
Date: Friday, June 1, 2012, 12:24 PM
Dears,--For STAINLESS STEEL butt welding ,gas purging is need with backing ring?We did a PQR with gas backing without backing ring,but in WPS can we use backing ring without gas backing (purging)?i expecting ur valuable comments with any supporting documents.thanks,
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