Welding of P5A & P5B Material

[KC]

Can any body inform about the …..

For the welding of SA 335 Gr. P91 (PNo-5B, Group No-2) Material………
1) What is the Preheating Temperature?
2) What is the Post heating Temperature & Time ?
3) PWHT is require or not ?
4) While welding (GTAW) Backing is require if yes, then Argon is OK ?

For the welding of SA 335 Gr. P22 (PNo-5A, Group No-1) Material………
1) What is the Preheating Temperature?
2) What is the Post heating Temperature & Time ?
3) PWHT is require or not ?
4) While welding (GTAW) Backing is require if yes, then Argon is OK ?

[Devarajan Ramasamy]

Refer to ASME B31.1 page 83 and 84 for preheating and post heating requirement for P5A and P5B. Generally, the minimum thickness for preheating & post heating for P5A material is above 13mm and for P5B material is above 10mm. Heating temperature for P5B material is 740 ~ 780 deg C and for P5A material is 680 ~ 720 deg C. Heating time varies with the thickness of the material. P5B material & P5A material requires argon backing.

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[kiran chavda]

Thank for your quick replay,  Yes, it is there in ASME B31.1, as per 131.4.5- Preheating & as per Table 132- Post weld heat treatment. But my question is related to post heating, means after complication of welding, immediately we have to do post heating for 2 hours @ 250˚C or 2.5 hors @ 200˚C ……( it is not a PWHT)   Please give me some information for this P5A & P5B material, because we have to establish new procedure for those materials……   Regards K.C.Chavda --- On Wed, 12/9/09, Devarajan Ramasamy <neo.de...@gmail.com> wrote:

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[PB HEGDE]

For Post heating after completion of welding (There should not be interruption during welding)  with out cooling to room temperature i.e. from preheating temp. you require to heat the joint uniformly  to 350-400C (Through  heating)  Soak for min 2hrs  min (Soaking time depends upon Joint Thk) and  after post heating let it cool in normal way but not fast cooling.

 However you have to monitor temperature properly all over the joint  during heating ./soaking .

This process is called DHT (Dehydogenation treatment ) This is to take care of Hydrogen Induced Cracking Generally require for P5 ,P4 material with higher thickness and Restrain joint

Handling of P5A (CrMo V ) steel is very critical require lot of discipline right from Cutting , Edge preparation, Consumable handling , Preheating , Interpass temp. Post heating , Weld joint welding of LS, CS, Shell to Nozzle joint,

Little negligence will cause cracks in weld and HAZ

 

Regards

 

Hegde p.B.

[Harikumar Dayalan / ZS Saudi PED QA/QC]

During welding (especially in SMAW Process) of low alloy steel, there is more possibility of hydrogen entrapment

Which leads to severe defects.

To avoid such kind of defects dehydrogenation treatment i.e. after completion of welding before reaching the preheat

Temperature, the weld shall be heated to 320 – 350 deg Celsius for 2 hrs and the same shall be cooled slowly by closing any insulation after

Post heat treatment.

Note: The time 2 hrs is considered only after the weld metal temp. reaches 320 deg Celsius.   

 

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of kiran chavda

Sent: Wednesday, December 09, 2009 1:18 PM
To: material...@googlegroups.com

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[Luis Carlos Flores Rivera]

Hola KC
 
We do not know the thickness.
 
However, regarding with your questions 1, 2 and 3 you can get answere on Table: 330.1.1 Preheat Temperatures and 331.1.1 Requirements for treantment, both belong B31.3.
 
Saludos

L. Carlos Flores

Piping Engineer

Especialidades en Turbo Maquinaria

 
> Date: Tue, 8 Dec 2009 23:43:33 -0800
> Subject: [MW:3807] Welding of P5A & P5B Material
> From: kc.ch...@gmail.com
> To: material...@googlegroups.com

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> The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

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[John Henning]

See below -

-----Original Message-----
From: material...@googlegroups.com
[mailto:material...@googlegroups.com] On Behalf Of KC
Sent: Wednesday, December 09, 2009 1:44 AM
To: Materials & Welding
Subject: [MW:3807] Welding of P5A & P5B Material

Can any body inform about the .....

For the welding of SA 335 Gr. P91 (PNo-5B, Group No-2) Material.........
1) What is the Preheating Temperature? 400F (200C)
minimum
2) What is the Post heating Temperature & Time ? Typical 1400F
+/- 25F (760C +/- 15C)
3) PWHT is require or not ? P91 should
always be PWHT'ed, only exception - ERW tube finning with qualifiers

4) While welding (GTAW) Backing is require if yes, then Argon is OK

? P91 open root welds should always be gas backed with Argon due to
high Cr.

For the welding of SA 335 Gr. P22 (PNo-5A, Group No-1) Material.........
1) What is the Preheating Temperature? 300F (150C)Code
minimum, I recommend 400F (200C)
2) What is the Post heating Temperature & Time ? Depends on
Code: Sec I or VIII 1250F (675C) min.; B31.X 1300F (705C) min.
3) PWHT is require or not ? Depends on (1)
Code and then (2) thickness, (3) diameter, and (4) type of weld -
insufficient detail

4) While welding (GTAW) Backing is require if yes, then Argon is OK

? Not required by Code, some customers want it others do not. My
opinion is that Cr content low enough it is not really required except
perhaps for highly aggressive corrosive environments certainly should
not be necessary for steam service.