RE: [MW:29023] Interpretation available (IX-04-03)

Hi Kannayeram Gnanapandithan,

 

The soak temperature and time for a hydrogen bake-out, or dehydrogenation heat treatment (DHT), depends on the size (diameter) and thickness of the weld.

A temperature of only 50 to 100 degrees above preheat temperature, for a time of only 30 minutes, is generally inadequate to ensure 100 % removal of hydrogen.

Email us the diameter and thickness of your weldment assembly, and we will recommend the DHT soak temperature and time for 100 % removal of hydrogen.

 

Regards,

Dennis Thompson, P. E.

Manager, Technical Support Group (TSG)

Dennis.Thompson@TeamInc.com

 

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Kannayeram Gnanapandithan
Sent: Thursday, January 31, 2019 10:02 PM
To: materials-welding
Subject: Re: [MW:29021] Interpretation available (IX-04-03)

 

EXTERNAL EMAIL

 

50 to 100 degree above preheat temp. Holding time minimum 30minutes . As per ASME it is not essential variable but it is good Engineering practice for carbon steel above 40mm, 

 

On Fri, 1 Feb 2019 8:25 am bilal wahla <bilalwahla047@gmail.com wrote:

Dear Friend,

Purpose of post heat is to DIFFUSE hydrogen after welding , for this purpose we hold our joint at 93-80 degree for 1 hour after completion of welding.

PWHT always Performed below Lower Transformation Temperature, PWHT and Post Heat is different things.

Kind Regards 

 

 

On Tue, Jan 29, 2019 at 2:27 PM George Dilintas <dilintas@gmail.com> wrote:

Most propably your client wants you to perform a hydrogen bake-out treatment 

 

Στις Δευ, 7 Ιαν 2019, 08:58 ο χρήστης muneebslsa@gmail.com <muneebslsa@gmail.com> έγραψε:

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

 

 

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

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Respected Sir,

 

Please find the enclosed file.

 

Bilal Arshad Wahla

P.W.H.T Engineer

SEPCO Electric Power Construction Corporation

Saudi Aramco JAZAN IGCC Power Block Project (EPC-4)

Jazan Economic City, KSA 

Mobile: +966 591317207

Email: bilalwahla.047@gmail.com

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