Re: [MW:29863] Asme Section IX Thickness range qualification

Dear Isac,

There are two type of thickness as per ASME IX i.e. base metal thickness, "T" and weld metal thickness, "t". WPS was qualified using 25.4 mm pipe (test specimen). The test specimen was welded by GTAW and SMAW welding process. The test specimen was welded by GTAW up to thickness of deposited 8mm and followed by SMAW  on the remaining thickness i.e. 16.5mm. So t for GTAW is 8mm and t for SMAW is 16.5mm. Therefore, the range thickness qualified as per QW-451 for base metal (T) and weld metal (t) as follows:

1. Base metal thickness, T: range of thickness qualified (for test specimen thickness of 19mm to 38mm) are 5 mm Min. to 2T (2 x 25.4 = 50.8mm) Max. However, if your WPS/PQR with impact test, the range base metal thickness qualified is T or 16mm, whichever is less as per QW-403,6. For test specimen thickness 25.4mm, T qualified is 16mm to 50.8mm only.

2. Weld metal thickness, t:

    a) weld metal thickness qualified for GTAW is 2t = 2 x 8 = 16mm. Max

    b) weld metal thickness qualified for SMAW is 2t = 2 x 16.5 = 33mm Max.

Your question: Can I make a weld using only the GTAW process, base metal with a thickness of less than 5mm? 

The answer is NO because the minimum base metal thickness qualified is less than 5mm either by GTAW or SMAW process.

However, there little bit difference on converting between imperial unit and metric unit. If we you calculate 3/16in. x 25.4 = 4.8mm but ASME IX use 5 mm. This depend on unit is used for your design/project.

Thanks & regards.

Mohd Nor

On Thursday, 18 July 2019, 11:04:04 am GMT+8, Isac Passaura <isac.passaura@gmail.com> wrote:

Thanks for the feedback

Yes, snap is ready WPS, follows attached.

But according to QW-451 because the coupon thickness is 25.4mm, the qualified range would be 5 to 2T, regardless of having deposited only 8mm with the GTAW process?

Thanks.

Isac

Em quarta-feira, 17 de julho de 2019 04:37:57 UTC-3, Muneeb escreveu:

Yes you can, 

Your 25.4 mm with gtaw and smaw can write 2t ranges from your PQR for what has been deposited individually.

you are going to write a WPS or below snap is ready WPS?

Check impact / PWHT requirements for what you qualified and what recommended in production joint.

Thanks.

Mohamed Muneeb Mahaboob.

 

From: Isac Passaura

Date: 2019-07-17 04:25

To: Materials & Welding

Subject: [MW:29843] Asme Section IX Thickness range qualification

Dear Experts,

I have some difficulty to interpret the requirements of ASME section IX

I have a  PQR Based on a dual process GTAW+SMAW ( 8 mm+17,4 mm) on an 25,4 mm butt weld.

Can I make a weld using only the GTAW process, base metal with a thickness of less than 5mm?

Are the image conditions correct?

Please give with details explanation regarding my above difficulty.

Thanks and Regards

Isac

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