Re: [MW:14459] BACKING RING NEED BACK GAS PURGING

Dear friend,   For groove welds in P-No. 41 through P-No. 49 and all welds of P-No. 10I, P-No. 10J, 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, -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.