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*****
>>>>
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