Thickness of weld metal qualified on two or more pipe as per ASME Sec ix for welders table QW-452.1 (b)
Babur Khan
Dear professionals,
Need your opinions and experience on below case.
Welders qualification as per ASME sec. ix for thickness qualification, can we use different thickness pipes as per Table QW-452.1 (b) Note (2) Two or more pipe test coupons with different weld metal thickness may be used to determine the weld metal thickness qualified and that thickness may be applied to production welds to the smallest diameter for which the welder is qualified in accordance with Table QW-452.3
One welder with below thickness qualifications.
Test A:
GTAW 4mm & SMAW 7.08mm qualified.
Test B:
GTAW 4mm & SMAW 22.98 mm qualified.
His qualification for GTAW 8mm? and SMAW Unlimited as per above note 2?
Noted: for reference images are attached.
Waiting for your valuable comments with references.
Ramesh
Hi
From the attached WPQ record, it clearly indicates,
Test A was welded with 2”NPS x 5.54 Thk & Test B was welded with 4”NPS x 13.49 Thk.
Test A was welded with GTAW 2mm & 3.54mm SMAW , So his qualification is GTAW up to 4 mm & SMAW up to 7.08 mm, and Dia qualified 25mm & Over – Example WELDER X
Test B was welded with GTAW 2mm & 11.49mm SMAW , So his qualification is GTAW up to 4 mm & SMAW up to 22.98mm, Dia qualified 73mm & Over - Example WELDER Y
So,
GTAW 2mm only deposited in either case and its qualified up to 4 mm only, Not 8 mm.!
SMAW 11.49mm only deposited and its qualified up to 22.98 mm only, Not unlimited.!
QW-452.1 (b) Note (2) shall be used when the diameter restriction along with thickness limitation comes in pics.
Example, In your case Test B i.e. WELDER Y cannot weld 25mm Dia pipe.
Thanks and Regards
Rameshkannan Devaraj
"What you have learned is a mere handful; What you haven't learned is
the size of the world – Avvaiyar"
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munee...@gmail.com
Greetings Gentlemen,
I have scrutinized your below query and its comes with conjunction to CASE A acceptable and CASE B not acceptable, please correct me / advise me if i am wrong.
CASE 1)
A) COMBI WPQ
GTAW-2''-3mm dep
SMAW-2''-2.54mm dep
B) COMBI
GTAW-4''-3.1mm dep
SMAW-4''-10.39mm dep
With both collaboratively gives a result as per below.
Dia 1'' O.D / 12.20mm GTAW dep / 25.86 SMAW dep which is acceptable as per below interpretation of ASME section IX 1993 edition.
Interpretation: IX-92-59
Subject: QW-306, Combination of Welding
Processes; QW-452.1 and QW-452.3,
Performance Qualification Thickness Limits and
Test Specimens
Date Issued: February 22, 1993
File No: 92-206
Background: The combination of welding
processes and pipe diameters listed below were used for performance
qualification:
(1) 2 in. Sch. 80 (.218) pipe with open butt
using GTAW process.
(2) 2 in. Sch. 160 (.343) pipe with consumable
insert and fill pass using the GΤAW process and the remainder welded with SMAW
process.
(3) 6 in. XXS (.864) using SMAW process with
backing.
Question: Using the combinations listed in the
Background, in accordance with QW-306, Note 2 of QW-452.1(b) to determine
maximum thickness qualified, and QW-452.3 for minimum diameter qualification,
is the welder qualified to weld on unlimited thickness and diameters above 1
in., using either an open butt joint or a consumable insert with the root layer
deposited with the GTAW process and the remainder deposited with the SMAW
process?
Reply: Yes.
CASE-2)
A) COMBI WPQ
GTAW-2''-3mm dep
SMAW-2''-5.08mm dep
B) COMBI
GTAW-4''-3.1mm dep
SMAW-4''-20.78mm dep
Answer: All are same as per CASE 1 except of SMAW noted as unlimited, which is not acceptable as ASME SEC IX QW-452..1 (b) states Thickness, t , of Weld Metal in
The Coupon, in. (mm) regardless of note 2, a single 13mm coupon requires over with a three layers.
Conclusion
Though note 2 speaks ‘’maybe applied to the production, which is fully depends upon the owners satisfaction, for above 2 cases can be accepted by them or even rejection with new qualification.
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MOHAMED MUNEEB MAHABOOB
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