Just to clarify:
The welder must work to a properly qualified WPS and PQR when taking his/her performance qualification test. The welder must meet the requirements of this WPS with exception of permitted exclusions as stated in the Code (PWHT for example does not have to be done).
The welder's qualified thickness range is independent of the performance test WPS used and is only based on the thickness of the deposited weld metal and the ranges of qualification per QW-452.1 (b). You can also see this in the essential variables; QW-352 through QW-357, which have no base metal thickness requirements/restrictions.
So a welder can complete his performance qualification with a WPS limited to 1 inch (25mm) maximum base metal thickness on a material , say, ¾ inch (19mm) thick. As long as he meets the other essential variables for the process (QW-352 through QW-357) he can weld to the maximum thickness stated on any other appropriate WPS. He is not limited to a maximum of 2 inches deposit thickness based on the performance qualification base metal thickness.
Hope this helps – let me know if you have further questions.
John
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Elshan Feyzullayev
Sent: Monday, March 14, 2011 7:26 AM
To: materials-welding@googlegroups.com
Subject: RE: [MW:10335] ASME IX - Welder's qualification Thickness range
Hi Babu,
I think Martin is correct on the thickness wise.
Please see as reference ASME IX 2001 QW 301.2.
If your WPS is qualified to do unlimited thickness and the test coupon which your welder has welded in fall to "inlimited thickness" category then the welder is qualified for "max to be welded" which means unlimited.
Your main reference should be the WPS which your welder is qualified to.
regards,
Elshan Feyzullayev.
Date: Sat, 12 Mar 2011 22:17:29 +0800
Subject: Re: [MW:10295] ASME IX - Welder's qualification Thickness range
From: kbabupsg@gmail.com
To: materials-welding@googlegroups.com
CC: martin_prad@hotmail.com
Hi Martin
If that is the case , we can't qualify the welder for unlimited thickness as the WPS has not qualified for unlimited thickness ?
In my opinion , "Maximum to be welded" indicates the unlimited thickness.
Regards
K.Babu
2011/3/10 Martin Prad <martin_prad@hotmail.com>
Dear Sir,
Your interpretation is true within the limits of your applicable qualified WPS. E.G. if your applicable WPS is qualified for max thickness 20 mm and your welder has welded 16 mm thk test coupon then the "Maximum to be welded" thikness is 20 mm.
Please note that you can not go beyond the applicable qualified WPS.
regards,
Martin.
Date: Wed, 9 Mar 2011 17:13:49 +0000
Subject: [MW:10246] ASME IX - Welder's qualification Thickness range
From: zakaria.ghrab@gmail.com
Hi all,
As per ASME sect IX table QW-452-1(b), for welder's qualified in test coupon thickness greater or equal than 13 mm, he's will be qualified to wed thickness " Maximum to be welded"
May my interpretation is true ??
In this case, Can i qualify all welder's in 13 mm thickness, he will be qualified for all thick ( PWHT is not essential variable for welders) and cover all thickness range ?
Regards
--
زكرياء غراب
GHRAB Zakaria
مسؤول عن الجودة
QA/QC SENAD
مشروع المحطة الحرارية ـ الوحدة الرابعة
المحمدية ـ المغرب
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