PWHT

[Krisanu Bhunia]

Dear sir,

In clean out door in tank we found welding not sufficient after PWHT.(A 537 CL1)

SO, now need to welding again . PWHT again doing or can avoid it by which code ?

Regards

krisanu bhunia

 

[syed moinul hasan]

After PWHT, if the welding is added , that means  you have to discard residual stresses which occured  due to additional  welding.

Hence, you have to go for Re-PWHT , refernce ASME 31.3

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[José Juan Jiménez Alejandro]

According to Section VIII Div. 1 BPVC ASME, you can do some kind of repracion after the PWHT welded, but this only applies to materials P1 and P3 number and for some thicknesses, which clearly defines the code.

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[Krisanu Bhunia]

Thanks, but is it possible to avoid PWHT ?

[José Juan Jiménez Alejandro]

It is assumed that in making this repracion of welding after the PWHT is no longer necessary to repeat again PWHT, but this is only for numbers P1 and P3 under certain thicknesses with the Building Code BPVC ASME Section VIII Div. 1

At this point I do not have exactly the reference code, you send it later for your review it thoroughly.

2016-07-17 0:18 GMT-05:00 Krisanu Bhunia <krisan...@gmail.com>:

Thanks, but is it possible to avoid PWHT ?

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[Krisanu Bhunia]

Dear Sir,

Please mention where it is in See viii ?

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[TC Kwa]

Please check UCS-56 (f).

 

Regards,

TC Kwa

+6012-3998739

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LinkedIn Profile : https://my.linkedin.com/in/tckwa 

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[ishwar kumar]

Dear experts

My query is what happens if the soaking time during PWHT is increased beyond the specified minimum time. I know section 8 days minimum soaking time only.

Suppose if required soaking time is 2.5 hours and actual soaking time is 5 hours

Regards
Ishwar Dhiman
Cswip 3.1,ASNT NDT Level-II

Sent from my iPhone

[Prakash Hegde]

Hi!

Selecting the Time and temp for PWHT is important  as it affetcts the mechanical properties

For which LM (Larsen Miller parameters ) helps

Increase in soaking time beyond certain limit deteriorates the mechanical properties

e.g. As per LM parameters  PWHt soaking temp of 650C with  2hrs soaking time is equivalent of 9hrs soaking time at 620C (even though code says for P1 soaking temp min 593c to below AC 1 )

Therefore you can imagine the importance of PWHT temp and time

Regards

Hegde

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[Kannayeram Gnanapandithan]

u should have simulated before taking up job. It is normally done by expecting  weld repairs after SR

THANKS & BEST REGARDS,

KG.PANDITHAN, IWE,  AWS-CWI, CSWIP 3.1,

CONSULTANT-WELDING & QUALITY

Mobile no: +919940739349

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[TDK YOKESH]

Hi ,
Well ,all your residual stresses would have been removed but check for the hardness value and  impact toughness if it  is an criteria . Basically your mechanical properties of the weld are affected .

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[ishwar kumar]

Sent from my iPhone

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[José Juan Jiménez Alejandro]

BPVC ASME Section VIII Div 1, allows welding after the PWHT, but only for materials P1 and P3 and only certain thickness, but remember that this code is only for new equipment, not for equipment being repaired, if this is your building code ahead !.

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[Krisanu Bhunia]

thank you, A537 CL1 is P1 marital but which thickness can do welding and which clause it is mention     

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[José Juan Jiménez Alejandro]

This information is gold, few people know.

Regards!.

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[Perumal Govindan]

Mr Jose is correct

With Kind Regards

P Govindan

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[George Dilintas]

Creep may occur 

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A.I.S, A.N.I, IRCA Lead Auditor

Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis

[untraceablenator]

Dear Ishwar,

You have simulated the welding & parent material with 2 cycle of PWHT.

This may effect your mechanical properites (specially impact & hardness), kindly take the test piece & simulate what you have carried out on the job.

The job can be accepted, If the test result meets the code requirement.

Regards

MK