Gents,
Noticed some lively discussion/remarks from experts on typical heat cycle for welding of Grade 91 base material. As a manufacturerer of consumables of advanced CrMoly grades,we have been suggesting DHT cycle if immediate PWHT facility is not available. Otherwise, kindly refer pg 12 of our Catalogue on Power Plant applications which is attached.
Thanks
With Kind Regards
Amitabha Bhattacharya
Head-Application Technology
Bohler Welding Group India Pvt. Ltd.
A-140, Road No 23, Wagle Industrial Estate
Metropolitan, Ground Floor
Thane 400 604, India
Ph: +91 22 2582 8855/4228 4400
Mobile ;+91 9833998246
Email: amitabha.bhattacharya@bwgindia.com
Web: www.bohlerweldinggroupindia.com
A Böhler Welding Group Company
This email message and any attachments are for the sole use of the intended recipient(s) and contain confidential and/or privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original message and any attachments
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of kannayeram gnanapandithan
Sent: Wednesday, July 31, 2013 11:46 AM
To: materials-welding
Subject: Re: [MW:18308] PHWT for P91
There is no time frame for delayed PWHT as long as we keep it protected from moisture and frequent handling after completion of Hydrogen bake out and cooling down to room temp.
On Wed, Jul 31, 2013 at 9:26 AM, rishikesh shahi <rishikeshshahi@gmail.com> wrote:
yes absolutely, but it should not be delayed more than 03 or 07 days.
some company instruct with in 03 days and some are with in 07 days
PWHT.
On 7/29/13, Shomenath Bagchi <snbagchi@ymail.com> wrote:
> Yes, but sometimes PWHT may get delayed due to unforeseen circumstances,
> then hydrogen baking becomes very important.
>
>
>
>
>
>>________________________________
>> From: rishikesh shahi <rishikeshshahi@gmail.com>
>>To: materials-welding@googlegroups.com
>>Sent: Monday, July 29, 2013 3:31 PM
>>Subject: Re: [MW:18277] PHWT for P91
>>
>>
>>absolutely right, if you are having facility for the immidiate PWHT
>>after completion of Immidiate welding then no need to go for the Post
>>weld Hydrogen Baking.
>>
>>On 7/25/13, kannayeram gnanapandithan <kgpandithan@gmail.com> wrote:
>>> *We have also done lot of P91 and what i expressed is my experience with
>>> this alloy. If u take it for PWHT immediate after welding ( Cooling
>>> down
>>> to less than 80degree Celsius) it is not require for Hydrogen bake out.
>>> Otherwise it is require before PWHT*
>>> *Pandithan*
>>> *Welding Consultant
>>> *
>>>
>>>
>>>
>>>
>>> On Wed, Jul 24, 2013 at 9:06 PM, John Henning <jhenning@deltak.com>
>>> wrote:
>>>
>>>> No its not. Adequate hydrogen control will prevent any cracking
>>>> issues.
>>>> We have welded a lot of this material without any hydrogen bakeout and
>>>> have
>>>> never experienced any HAC. Problems with this alloy are oversold –
>>>> with
>>>> good up front preparation and reasonable care during fabrication and
>>>> this
>>>> alloy behaves itself. ****
>>>>
>>>> ** **
>>>>
>>>> John A. Henning****
>>>>
>>>> Welding & Materials****
>>>>
>>>> ** **
>>>>
>>>> *From:* materials-welding@googlegroups.com [mailto:
>>>> materials-welding@googlegroups.com] *On Behalf Of *kannayeram
>>>> gnanapandithan
>>>> *Sent:* Tuesday, July 23, 2013 11:26 PM
>>>> *To:* materials-welding
>>>> *Subject:* Re: [MW:18257] PHWT for P91****
>>>>
>>>> ** **
>>>>
>>>> *Hydrogen bake out always require for P91 welding with flux containing
>>>> welding process irrespective of climatic condition.*****
>>>>
>>>> *Pandithan*****
>>>>
>>>> *Welding Consultant*****
>>>>
>>>> ** **
>>>>
>>>> On Wed, Jul 24, 2013 at 9:16 AM, Shomenath Bagchi <snbagchi@ymail.com>
>>>> wrote:****
>>>>
>>>> Hydrogen bake is specially important in monsoon due to high humidity.
>>>> It
>>>> can initiate microscopic ****
>>>>
>>>> hydrogen cracks if not baked in time, so very important in wet climate.
>>>> These minute cracks can ****
>>>>
>>>> be revealed by electron microscope.****
>>>> ------------------------------
>>>>
>>>> *From:* kannayeram gnanapandithan <kgpandithan@gmail.com>
>>>> *To:* materials-welding <materials-welding@googlegroups.com>
>>>> *Sent:* Tuesday, July 23, 2013 10:13 AM
>>>> *Subject:* Re: [MW:18253] PHWT for P91****
>>>>
>>>> ** **
>>>>
>>>> These has been discussed by experts in earlier forum. Aim of pwht is
>>>> not
>>>> only to reduce residual stress but to bring down the Hardness also.****
>>>>
>>>> After completion of welding, put it on Hydrogen bake out( time
>>>> according
>>>> thickness) at temp more than preheat+100deg Celsius for 3 to 4 hrs.****
>>>>
>>>> After completion of Hydrogen bake out, cover with glass wool to make
>>>> it
>>>> slow cooling till 70 degree Celsius and take it for PWHT****
>>>>
>>>> ** **
>>>>
>>>> Pandithan****
>>>>
>>>> welding consultant****
>>>>
>>>> ** **
>>>>
>>>> On Mon, Jul 22, 2013 at 6:25 PM, rishikesh shahi
>>>> <rishikeshshahi@gmail.com>
>>>> wrote:****
>>>>
>>>> Dear Binoy,****
>>>>
>>>> ****
>>>>
>>>> after completion of welding allow to cool the weld metal at 90 deg.
>>>> centigrade for the formation of complete martensite. in actual the 90
>>>> deg.
>>>> centigrade temp. is called Mf Temp. (Mf = Martensite finished temp.).
>>>> after
>>>> this we have to do the Post Weld Hydrogen Baking of Welded joint for 04
>>>> Hrs. at the Temp. of 350-400 deg. centigrade for diffusion of hydrogen
>>>> from the weld metal.****
>>>>
>>>> ****
>>>>
>>>> After this you have to allow to cool the weld metal minimum 90 deg.
>>>> centigrade till completion of PWHT. but the cooling rate should not be
>>>> more
>>>> than 100 deg. centigrade.****
>>>>
>>>> ****
>>>>
>>>> you have to maintain this temp. (90 deg. centigrade) before PWHT.****
>>>>
>>>> ****
>>>>
>>>> as per code it is only telling about the minimum soaking time that is
>>>> 30Min., means understood that you are not restricted to maximum.****
>>>>
>>>> ****
>>>>
>>>> ****
>>>>
>>>> Regards.****
>>>>
>>>> Rishikesh Shahi****
>>>>
>>>> Welding Engineer ****
>>>>
>>>> Doosan Power System India Pvt. Ltd. ****
>>>>
>>>> ****
>>>>
>>>>
>>>>
>>>> ****
>>>>
>>>> On Tue, May 7, 2013 at 11:38 AM, Binoy Soman <binoy.spp@daelim.co.kr>
>>>> wrote:****
>>>>
>>>> ****
>>>>
>>>> Dear experts,****
>>>>
>>>> ****
>>>>
>>>> Kindly explain following queries****
>>>>
>>>> (a) PWHT holding time for P91 mentioned in B 31.1 is 1 hr/25 mm;
>>>> minimum 30 minutes. Does it mean that if the thickness is 6/10/12.5 mm
>>>> the
>>>> holding time is 30 minutes & for 15 ,20,30,40 mm the holding time is 36
>>>> 48,72,96 minutes respectively.****
>>>>
>>>> (b) I got some special heating curves for P 91 from our group. But
>>>> Kindly explain about the reference /standard used for preparation of
>>>> this
>>>> heat curve ( eg- why the preheat maintenance is 4 hours & again free
>>>> cooling). ****
>>>>
>>>> I raised these doubts earlier in [MW:17585], but I didn’t receive any
>>>> response. Please give your comments.****
>>>>
>>>> ****
>>>>
>>>> ****
>>>>
>>>> *S.Binoy*****
>>>>
>>>> --
>>>> 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/groups/opt_out.
>>>>
>>>> ****
>>>>
>>>>
>>>> --
>>>> 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/groups/opt_out.
>>>>
>>>> ****
>>>>
>>>> ** **
>>>>
>>>> --
>>>> 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/groups/opt_out.
>>>>
>>>> ****
>>>>
>>>> ** **
>>>>
>>>> --
>>>> 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/groups/opt_out.
>>>>
>>>> ****
>>>>
>>>> ** **
>>>>
>>>> --
>>>> 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/groups/opt_out.
>>>>
>>>> ****
>>>>
>>>> ______________________________________________________________________
>>>> The information in this email is confidential, and is intended solely
>>>> for
>>>> the addressee(s). If you are not the intended recipient of this email
>>>> please let us know by reply and then delete it from your system; you
>>>> should
>>>> not copy this message or disclose its contents to anyone. The internet
>>>> can
>>>> not guarantee the integrity of this message. HAMON (and its
>>>> subsidiaries)
>>>> shall (will) not therefore be liable for the message if modified.
>>>> ______________________________________________________________________
>>>>
>>>> --
>>>> 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/groups/opt_out.
>>>>
>>>>
>>>>
>>>
>>> --
>>> 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/groups/opt_out.
>>>
>>>
>>>
>>
>>--
>>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/groups/opt_out.
>>
>>
>>
>>
>
> --
> 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/groups/opt_out.
>
>
>
--
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/groups/opt_out.
--
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/groups/opt_out.
No comments:
Post a Comment