Re: [MW:22100] Re: MW: 8258- How to control cracks when weld P91 and P91

BEGIN:VCARD
X-LOTUS-CHARSET:UTF-8
VERSION:3.0
PRODID:-//Lotus Development Corporation//NONSGML Notes 8.5.2//EN_C
FN:George H Dilintas/GRC/VERITAS
N:Dilintas;George;;;
ADR;TYPE=WORK;TYPE=PREF:PIRAEUS;;23\, Etolikoy Str.;PIRAEUS;;185 45
;GREECE
ADR;TYPE=HOME;TYPE=PREF:;;19-21 B. Laskou str.;Athens;Attika;11 633
;Greece
TEL;TYPE=HOME:+30-1-7667 197
TEL;TYPE=WORK:+30-210-40 63 113
TEL;TYPE=HOME;TYPE=FAX:+30 - 1 - 7667 197
TEL;TYPE=WORK;TYPE=FAX:+30-210-40 63 118
TEL;TYPE=CELL:+30 -69 44-64 62 04
EMAIL;TYPE=WORK;TYPE=PREF;TYPE=INTERNET
:george.dilintas@gr.bureauveritas.com
ORG:Bureau Veritas;Industry
REV:20131201T024559Z
END:VCARD

Your answer is in the paragraph 131.6.2 of ASME B31.1.
I would suggest to add to the Code requirements a hydrogen bake-out treatment (at 200 degC for 2 hours)

best regards

Dr. Georgios Dilintas

Authorized Nuclear Inspector
Authorized Inspector Supervisor


I&F REGIONAL TECHNICAL MANAGER
BUREAU VERITAS HELLAS

Tel: +30 210 40 63 113/4
Fax: +30 210 40 63 118
Cell: +30 69 44 64 62 04
(See attached file: Dilintas_George.vcf)

pras ari ---13/10/2014 16:01:45---Dear Sir, What can I do, if PWHT can't continue after weld joint complete because it

From: pras ari <alhanif.pras@gmail.com>
To: materials-welding@googlegroups.com
Cc: pgoswami@quickclic.net
Date: 13/10/2014 16:01
Subject: [MW:22094] Re: MW: 8258- How to control cracks when weld P91 and P91
Sent by: materials-welding@googlegroups.com

---

Dear Sir,

What can I do, if PWHT can't continue after weld joint complete because it will conduct RT on lower temperature ( < 50 degree), after RT pass PWHT will be proceed (may be 1 or 2 day after).
Please give me reference and heat treatment chart.


On Tuesday, November 16, 2010 11:20:16 AM UTC+7, pgoswami wrote:
Hello Liu,
 
I've attached some information on recommended welding consumables and welding parameters for P-91 steel. Being the products of Metrode certainly these products are very well known in the welding world.
 
The typical formula for heat input as per Sec-IX is =
  =380X35X60 / 25=3192 J/mm =3.2 KJ/mm
 
The heat input looks to be  at least 25-50% higher than the optimum level 2-2-5. KJ/mm. This may be controlled by increasing the travel speed. SAW welds produces wider HAZ, as compared to SMAW or GTAW. Impact properties for SAW welds are relatively less than GTAW -P-91 weld metal One of the possible causes for reduced impact strength could be higher "Si" in the weld metal and relatively higher input in SAW
 
As regarding PWHT-- all welds in utility (power plant) services would require PWHT at 760°C ± 14°C (1400°F ± 25°F) minimum, regardless of wall thickness or diameter.
 
Te preheat and interpass temperature looks fine.The recommendations  would be :-
 
Controlling Cracks:-For controlling cold cracks, maintain the preheat, interpass control,immediate cooling to 100deg C for complete martensitic transformation as below. Hot cracks could be controlled through a strict control of:C" and 'Si" in the weld.
 
As regarding PWHT:- Ensure the PWHT temperature does not exceed the base metal tempering temperature and stays in the above mentioned temperature range. In fact it would be advisable to work out the best welding parameters after verifying the base metal CMTR(especially impact)
 

Thanks.
 
 
Pradip Goswami,P.Eng.
Welding & Metallurgical Specialist & Consultant
Email-pgoswami@sympatico.ca,
pgos...@quickclic.net
 

---

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of Roy LIU??
Sent: Sunday, November 14, 2010 7:30 AM
To: material...@googlegroups.com
Subject: [MW:8258] How to control cracks when weld P91 and P91

Dear All,
I just meet a problem from one of my customers.
It is a Boiler Manufactory in China.

Details as follow:
base material: P91
process: SMAW (root) + SAW (filler metals)
Heat Input: high  
I=380A
U=35V
V=250mm/min
Preheat, Interpass Temperature: ≤250℃

How to control cracks?
How to increase impact properties afer PWHT?

 

Best regards

 

Roy LIU

--
To post to this group, send email to material...@googlegroups.com
To unsubscribe from this group, send email to materials-weld...@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
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.

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm

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.
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

This message contains confidential information. To know more, please click on the following link: http://disclaimer.bureauveritas.com