Short answer is no. The combination referred to in 200.2 (f) is for a single process with PQRs on performed on multiple thicknesses.
John A. Henning
Welding & Materials
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of sevak hiren
Sent: Wednesday, November 30, 2011 6:58 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:13116] QW-200.4
Thanks for explaination, so what does the clause QW-200.1 (f) mean ? Can't we apply this clause to combine two different processes ?
On Wed, Nov 30, 2011 at 9:59 AM, manpreet <manpreetsin88@rediffmail.com> wrote:
Hi Aly,
Below is interpretation based on Mr. John's wonderful explanation to me in this forum:-
Aly's interpretation is correct based on QW-200.4 (b) but if base metal thickness are lesser than 13mm, QW-200.4 (b) does not apply and below would be the answer:-
PQR 1- 1.5mm to 12mm
PQR 2- 5mm to 30mm
Qualified base metal range: 5mm to 12mm ( 1.5mm < T1 < 12mm, 5mm <
T2 < 30mm )
Maximum Qualified GTAW deposit: 12mm
Maximum qualified SMAW deposit: 12mm
QW-200.4 (a) allows you to combine these two PQR’s to support a single WPS. In
such a case the WPS will be restricted to the minimum range qualified by the PQR
base metals (per QW-451); i.e. the intersection of the two individual qualified ranges.
QW-200.4(b) is an exception to the general rules for root pass process qualified with a PQR
with base metal thickness > 13mm, and a second PQR for a fill process qualified with a base
metal thickness greater than the base metal thickness used with the root pass PQR.One example of
an acceptable combination would be PQR 1 –13mm thick base metal w/ GTAW root (for the
purpose of example say 6mm deposit thickness, t) combined with PQR 2: 38mm base metal
thickness welded completely by SAW
These conditions would result in a combined WPS such as:
Qualified base metal range: 5mm to 200mm
Qualified maximum GTAW deposit thickness: 12mm
Qualified maximum SAW deposit thickness: 200mm
Hope this helps, please let me know if in doubt.
Regards
Manpreet Singh
From: "Aly" <mhaskar.aly@gmail.com>
Sent: Tue, 29 Nov 2011 16:10:03
To: <materials-welding@googlegroups.com>
Subject: Re: [MW:13071] QW-200.4
Advantage of combining two processes: Suppose u have two wps as below 1: WPS with GTAW with 13mm base plate thickness (Base metal Qualification range is 26mm max) 2:WPS with SMAW with 20mm base plate thickness (Base metal Qualification range is 40mm max) If u combined these two WPS, the advantage you can get is u can weld GTAW process double the max thickness between two process ie (2 x 20mm = 40mm) not upto 26mm only. You can use more than one WPS in one single joint, just to increase base metal thickness qualification range one can combine two process as per QW-200.4(b). You can create many WPS from one single PQR as needed. Hope this is clear for you.. Mhaskar Aly -------Original Message------- From: sevak hiren Date: 18/11/2011 21:08:13 Subject: [MW:13020] QW-200.4 Dear experts....Can anyone provide some Section IX interpretations for clause no.QW-200.4 ?................Can anybody explain this clause better ?...........It clearly states that multiple wps of different processes can be combined together and we can make a single wps combining that processes...........and from one pqr combining different processes ,individual wps can be prepared for each process..............the root deposites clause of min 13 mm is an ALTERNATE requirement....is it really applicable in which situation ?............... -- | ||
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