Dear Israr,
Assaalmu alaikum,
As per QW200.4(b) to combine 2 PQR , you should have two PQR having base metal thk more than 13mm minimum
Suppose you have two PQR one is GTAW with 13mm thk base metal and other is SMAW 25mm base metal thk (more than 13mm), then you can establish one WPS by combining these two PQR. By combining these two PQRs you can get benefit in Qualified ranges of base metal as you can weld joint upto 50mm. ( based on for 25mm second PQR). Now with combination you can weld the 50mm joint with GTAW root and SMAW balance welding.
You can not used GTAW procedure with 13mm thk Base metal to weld 50mm joint, you can weld upto 26mm only but by combining two PQR you can weld 50mm joint( based on for 25mm second PQR) by doing GTAW root and balance by SMAW.
Hope this will make you understand.
Aly
Kuwait
From: israr <ahmedisrar.nm@gmail.com>
To: Materials & Welding <materials-welding@googlegroups.com>
Sent: Tue, February 2, 2010 8:40:17 AM
Subject: [MW:4180] Re: 4176] Impact Tested PQR for Non Impact Tested WPS
Dear Mr. Raghuram,
I am israr ahmed presently working in one of the co. in saudi arabia,
I am always confused in ASME Section IX 200.2 and 200.4, I have
qualifies two PQR, one for GTAW 13mm thick and another wirh SMAW 13 mm
Thick and now it is possible to combination welding with GTAW and
SMAW, if suppose I do GTAW 4mm and SMAW 11mm in a single test piece
will it possible to prepare 2 WPS one for root with thickness deposit
8mm and SMAW thickness deposit 22mm.
On Feb 2, 6:29 am, "Bathula Raghuram (Mumbai - PIPING)"
<R.Bath...@ticb.com> wrote:
> pl. refer answers below
>
> ________________________________
>
> From: materials-welding@googlegroups.com
> [mailto:materials-welding@googlegroups.com] On Behalf Of tong tong
> Sent: Tuesday, February 02, 2010 7:54 AM
> To: materials-welding@googlegroups.com
> Subject: [MW:4176] Impact Tested PQR for Non Impact Tested WPS
>
> Dear All,
>
> Note-1:A PQR was Impact tested at -46 C, on a 12" Dia Pipe Sch 40 (Wall
> Thickness=10.31mm) Deposited Weld Metal: GTAW=4mm & Balance SMAW.
> Note-2: The WPS Supported by Above PQR is not Impact tested Designed
> Welding.
>
> Q: Can this Impact Tested PQR support a non Impact Tested WPS which is
> to be used for Welding of D-catagory(B31.3-300.2) Piping.(Non LTCS).
> Yes, you can
> Q: What will be the ranges of qualification of deposited metal & base
> metal.
> Base metal : 5-20.62mm, weld metal : GTAW 8mm max, SMAW 12.62mm max.
> Q If we want to make two WPSs from this PQR (1- for GTAW for Small
> Thickness Welding & 2- for GTAW/SMAW for larger thickness). What to do?
> you can make two separate WPS with base/weld metal thickness limits as
> specified in Q2.
>
> Any code case, ASME IX interpretation or reference that we can refer to.
>
> refer QW 451.1
>
> Regards
>
> Filtered by Hosted Filtering
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