Re: [MW:28869] Interpretation available (IX-04-03)

Hi

1.    Post heating does not fall under PWHT category, It is like preheating / inter pass maintenance temperature. Max Post heating temperature shall be 250 – 300°C

2.    Post heating time and temperature range requirements based your P.No shall be provided by client since it is not part of ASME Sec –IX essential requirements

3.    After completion of welding then post-heating is done, the weld shall be allowed to cool down to below 100°C before starting of actual PWHT ( for P22 & P91)

4.    If post heat is applied in PQR, equivalent post heat shall be applied also in the production weld also

As per TWI

Post-heat is a fabrication hydrogen evolution process. Hydrogen bake-out is usually done during repair or modification of a component which has seen service in a hydrogen environment, to reduce the hydrogen that has been introduced in service, before attempting to weld the component

https://www.twi-global.com/technical-knowledge/faqs/faq-what-is-meant-by-post-heating-and-how-is-it-applied

Thanks and Regards

Rameshkannan Devaraj

"What you have learned is a mere handful; What you haven't learned is the size of the world – Avvaiyar"

On Mon, Jan 7, 2019 at 12:28 PM muneebslsa@gmail.com <muneebslsa@gmail.com> wrote:

Hi All,

Client specification calls for post weld baking/heating (not stated as PWHT) of a P No.1 material after welding for a specific reason. Does it consider a PWHT condition as per ASME Sec IX QW-407.1(a) Point#2, i.e PWHT below lower transformation temperature? If it is considered as PWHT as per the clause above, then would a PQR with 200 Deg C PWHT qualifies to perform PWHT on the weld at 600 Deg C which is below the lower transformation temperature of P No.1 keeping all other essential variables same. Note: Though there is an interpretation available (IX-04-03), it doesn't state the answer instead it refers to QW-407.1 (throwing the ball away wisely).

Originally posted in Linkedin

by

Ishack Mohammed Ismail 

• 1st

Technical Representative at ABS Consulting

4d • Materials-Welding

---

Regards,

Mohamed Muneeb Mahaboob

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IRCA-9001:2015 LA

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E muneebslsa@gmail.com M +91-636-955-7189

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