Materials & Welding: RE: [MW:31912] Retest of mechanical failure as per ASME Sec IX

Monday, January 4, 2021

RE: [MW:31912] Retest of mechanical failure as per ASME Sec IX

Hi Mr Gupta,

The third para of QW 202.1 is referred and highlighted here , to discuss about this problem. According to your statement: the defect length on the failed specimen was more than 3 mm. What was the defect: lack of fusion, crack, slag inclusions, porosities.? Note all of these are welding process related and failures of test coupons due to these can't be argued and accepted.

In order to prove your point, you may have to corelate the presence of defects with NDE (RT films), provided RT was done on the coupons. According to ASME Sec-IX,RT is not mandatory for procedure coupons. ASME allows the leverage to leave the defect containing area from extracting any testing specimen.

Acceptance criteria for bend tests are quite severe, except for failures due to sharp corners all other failures are always under the microscope and test could be rejected.

If the defects are any one those , as above , then they're process parameter related, re-welding and retesting are the only options.

Thanks.

Pradip Goswami.P.Eng, IWE.

Independent & Consulting Welding & Metallurgical Specialist

Linkedin: https://www.linkedin.com/in/pradip-goswami-2999855/

Email:pgoswami@rogers.com,pradip.goswami@gmail.com

Cell/Whasapp:1-905-9793232

From: materials-welding@googlegroups.com <materials-welding@googlegroups.com> On Behalf Of Jamie Reyes
Sent: January 3, 2021 11:47 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:31905] Retest of mechanical failure as per ASME Sec IX

For such scenario that you speak of, retest is allowed And warranted per ASME IX.

On Sun, Jan 3, 2021 at 7:47 PM 'M R GUPTA' via Materials & Welding <materials-welding@googlegroups.com> wrote:

Dear Experts

Kindly suggest on below case

We have prepared proposed wps on the basis of that pqr was welded in one of the established classification society. Test coupon were sent in NABL lab... TPI witnessed the same...four side bend, two tensile and hardness conducted in the lab.

All test pass however one of the bend tests failed due to defects length more the 3mm.

Then we approach TPI for re-test from the original specimen as per ASME QW202. 1 (3rd para).

But classification society project manager says it is a wrong practice and we will witness only new welding samples.

We told him that it is written in the code and if all other test is passed then failure is not related to welding parameters.... It is particularly related to specific defect may be present at that point and that has caused failure and for that there is an option for re-test as per ASME Sec IX.

Kindly suggest your opinion... And what should we do now? Because classification society is not willing to witness the re-test as per ASME sec ix.

Rgds,
M R Gupta
+91-9820604076

Sent from Yahoo Mail on Android
--
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/137049239.5216646.1609653065444%40mail.yahoo.com.