Re: FW: [MW:4163] Underclad cracking tests

Dear Sir

We have to deposit min. 6mm overlay by SASC on LAS - shell & Dish end I.D.
First layer is by 309L(Cb) and subsequent layers by 347L.

For this it has been specified that Weld specimen for Reheat cracking should be prepared.
The procedure is : do cladding by SASC with high heat input,remove the clad till weld fusion layer is exposed and conduct MPI + Metallography.

We have been told that Hydrogen induced cracking should be checked by welding a 50mm width overlay with E9018G on LAS with low heat input, kept at room temperature for 8-10 days... ( No reference standard is mentioned )

I just needed more detailed information / procedure..

Regards

Prem Nautiyal

On Fri, 29 Jan 2010 08:46:28 +0530 wrote
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>
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Hi Prem,

Could you be more specific about your query:-

· Underclad Cracking Test— is it related to SAW strip cladding of S.S / Inconel on Reactor Pressure Vessels (RPV) shells. What kind of reheat cracking tests you have to do? Usually reheat cracking is very difficult to simulate.

· Regarding hydrogen cracking, there are standard tests developed and adopted by the industry. If you are familiar with Tekken Y-Grove test, it's a very popular test for hydrogen cracking. What's the test you're asked to perform in this case.

However underclad hydrogen cracking is a bit different issue. Typically it's commonly performed as autoclave testing, and ASTM –G-146, is the standard followed for this underclad hydrogen disbanding test.

Due to copyright issue, I can not post the ASTM standard. However the attached article tells clearly how this test is performed.

Thanks


Pradip Goswami,P.Eng
Senior Engineer/Specialist(Welding-Metallurgy)
Engineering & Training Services Division
ONTARIO POWER GENERATION Inc.
PO Box-2000, RR-55(South)
Nanticoke, Ontario,N0A1L0
Tel:-(519) 587-2201, Ext 3107--in Nanticoke
(416) 231-4111, Ext 5925--in Kipling,Toronto
Fax:(519) 587-6814
Email-pradip.goswami@opg.com.




From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of PREM SHANKARDUTT NAUTIYAL
>Sent: Wednesday, January 27, 2010 1:20 PM
>To: materials-welding@googlegroups.com
>Subject: *****SPAM***** [MW:4160] Underclad cracking tests

Dear All
>
>Can anyone provide some article / explanation / detailed procedure about how to prepare specimens and conduct test for the following Underclad cracking test ---

>1)Weld specimen for reheat cracking.
>2)weld specimen for Hydrogen induced cracking.

>The job is a PV, code of construction is ASME Sec III, NB.
>
>Regards
>
>Prem Nautiyal
>
>PREM S NAUTIYAL
>CELL : 9820313278





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PREM S NAUTIYAL
CELL : 9820313278

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