Yes you can combine them.
NO it will not meet his requirements as you will be limited to the qualification thicknesses for base metal and weld metal of the GTAW process. See QW-200.4(a)(1) and QW-200.4(a)(2). His combined weld cannot be greater than 2T and 2t for the GTAW - i.e. 11.04mm for both. Thus, the root cannot be made on the 12.70mm thick weld.
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Manoj Singh
Sent: Wednesday, January 18, 2017 1:09 AM
To: materials-welding@googlegroups.com
Subject: RE: [MW:25924] Combining 2 PQRS
Yes u can pls.refer sec Ix welding general requirement.
On 17 Jan 2017 9:35 pm, "John Henning" <jhenning@deltak.com> wrote:
NO - Per ASME IX.
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Lalit Malla
Sent: Tuesday, January 17, 2017 6:07 AM
To: Materials & Welding
Subject: [MW:25915] Combining 2 PQRS
Dear Expert,
I am having 2 PQRs i.e.:
1. 2" Sch. 80 Pipe (thk.-5.54mm) - GTAW (70S-2)
2. 6" Sch. 160 Pipe (thk.-18.26mm) - SMAW (7018)
My question is: Can I combine these 2 PQRs for buiding up one more making new WPS for 8" Sch. 80 Pipe (thk.-12.70mm) using GTAW+SMAW (Root and hot with GTAW and filling and capping with SMAW)
Thanx in advance
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