PWHT soak temperature variation

[Kandula Raju]

Dear Experts, 

   We have completed  post weld heat treatment of weld overlay in a large automatic programmer electrical furnace according to API6A and ASME Sec VIII Div.1, as per WPS heating rate shall be 100degree C per hour, so we have set heating rate from 300 to 600 degree C in 3 hours, however since its programme is computer controlled, we are reaching 100 degree C in 45 min instead of 1 hour and 15 min holding at each 100 degree progression, as per our customer heating rate shall have regular slope without any holding. Attached heat treatment chart for your review.

    Please do advice does it have any effect on weldment properties and is any code governs or states heating rate slope shall be steady.

[Vishwas Keskar]

What is governing thickness 

Pl. calculate rate of heating as per ASME  SEC VIII 

It shall not be more than the calculated rate of heating

Steady Slope etc are not addressed.

No issue as per as weldment/parent material properties are concerned 

 

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[Vimal Mistry]

You can also verified microstructures of weldment, if its meet your requirement there is no issue.

 

Vimal Mistry I Tower SCM-QA

Mo#9099018064

 

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of Vishwas Keskar
Sent: Monday, August 17, 2020 9:43 AM
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Subject: Re: [MW:31308] PWHT soak temperature variation

 

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[harenath jha]

Your client is right .

As per code understanding heating rate shall be uniform, as you have mentioned and also inferring from graph..heating rate is more than  the defined (i.e 100 deg/hour). 

Hence for accepting this client may ask for microstructure examination, hardness testing or even repeat PWHT.

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[Zacharias Rohith Joseph]

Repeat PWHT. wont that be detrimental to the weld and the parent metal? 

[George Dilintas]

Code is imposing a maximum. Uniformity of heating rate is a good engineering practice but no Code requirement. Looking on your chart I dont see any issue

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Dr. Georgios Dilintas,

Dipl. Ing. In Aeronautic and Space Engineering

Ph.D in Mechanics of Solids - Computational Mechanics

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

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

[Babu Kathalingam]

Chart is absolutely fine & in-ine with good engineering practice .

Thanks & regards,

Babu

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