Welder thickness range qualified 4

[kagemaru05]

Good Day!

I would to ask regarding the welder qualification test

A welder is qualified with SMAW on a 2" pipe coupon with weld thickness 2T and 6" pipe coupon with unlimited thickness
Can I assume that the welder is qualified 1" OD min with "unlimited" weld metal thickness range?

Kindly help..

Thanks

 

[metengr]

Not enough information to provide an answer without guessing. Is this to ASME Section IX requirements? Second, what exactly were the coupon dimensions for the welder qualification? 2" pipe coupon? 2" schedule 60, 80, 120? What about the 6" pipe coupon?

 

[kagemaru05]

metengr

The data are as follows:
Welder Qualification has been done as per ASME Sec IX by two test
1) A106 Pipe 2" Sch 160 with SMAW weld deposit of 5.5mm (thus qualifying him for 1" OD min and 11mm thickness range)
2) A106 Pipe 6" Sch 160 with SMAW weld deposit of 15mm (thus qualifying him for 2 7/8" OD min and unlimited thickness range)

with the test above is it correct to give him an ID card stating that he is qualified 1" OD min and "unlimited thickness"?

I'm sorry I posted again on the other forums..I am quite new here

Thanks in advance

Kagemaru05

 

[Kiwi2671]

Kagemaru05,
Yes, he is qualified as you have stated.
Regards,
Kiwi

 

[metengr]

Just a point of clarification, there is no unlimited thickness, it should state 30mm maximum. Unlimited refers to diameter only. Please see Table QW-452.1(b). The 13mm and over reference in this table for coupon thickness means the maximum thickness of the WPS used to qualify the welder.

 

[kagemaru05]

Kiwi2671 & metengr

Thank you very much for your input on this, not it is clear for me. Also, regarding "maximum to be welded" as per QW-452.1 (b)

kagemaru05

 

[metengr]

The statement in this table refers to the maximum welded deposit thickness based on the welding procedure specification used for the welder performance qualification. For example, if a WPS was used that qualifies to a maximum of 8” in thickness, the welder could qualify to an 8” maximum thickness, depending on the coupon thickness.

 

[kagemaru05]

metengr

Thank you for your clarification, I misinterpreted the expression "maximum to be welded" as being qualified to unlimited thickness. I will re-check the WPQR since some of the welders have the thickness range of "unlimited" because their weld deposit is 13mm or more

kagemaru05

 

[Kiwi2671]

metengr,
Please review interpretations below before kagemaru05 goes and changes all his welder qualification certs.
The thickness range of the WPS used for the welder qualification is irrelevant - a company may have 100 x WPSs and you cannot limit a welder solely to the WPS he qualified with.
The third interpretation is very close to kagemarus situation.
I only have ASME IXs back to 2001 - did the 1/2" (13 mm) requirement used to be 3/4" (19 mm) back in the 1990s (based on the 3 x interpretations below) ?
Regards,
Kiwi

Interpretation: IX-89-52
Subject: Section IX, QW-452.1
Date Issued: February 28, 1990
File: BC90-044
Question: For the maximum thickness qualified on a test coupon of 3/4 in. or more in thickness, does “Max.to be welded “ mean that the maximum qualified weld thickness is unlimited?
Reply: Yes.



Interpretation: I>(-89-95
Subject: Section IX, QW-452.1
Date Issued: March 7, 1991
File: BC90-869
Question: Is a welder who has qualified using a deposit thickness of 0.90 in. qualified to weld the entire thickness of a 3 in, thick material?
Reply: Yes.


Interpretation: IX-92-59
Subject: Section IX, 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: BC92-206

Background: The combination of welding processes and pipe diameters listed below were used for performance qualification:
(1) 2 in. Sch. 80 (5.5 mm) pipe with open butt using GTAW process.
(2) 2 in. Sch. 160 (8.71 mm) pipe with consumable insert and fill pass using the GTAW process and the remainder welded with SMAW process.
(3) 6 in. XXS (21.9 mm) using SMAW process with backing.

Question: Using the combinations listed in the Background, in accordance with QW-306, Note 2 of QW-452.1 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.

 

[metengr]

Kiwi2671;
Thanks for finding the interpretations. I would agree. I am not a member of Section IX standards committee, however, I do see their ballots as a member of BPV I. The 3/4" was changed to 1/2" after 2001.

 

[kagemaru05]

kiwi2671 and metengr

Thanks again for the information you've shared..I am new with Sec IX and I'm glad you guys shed some light for me.


Kagemaru05