I would like to add that the weld specimen for Reheat cracking has to undergo simulated PWHT before the clad is removed ..
Regards
Prem Nautiyal
On Fri, 29 Jan 2010 20:07:13 +0530 wrote
>Dear Sir
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We have to deposit min. 6mm overlay by SASC on LAS - shell & Dish end I.D.
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First layer is by 309L(Cb) and subsequent layers by 347L.
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For this it has been specified that Weld specimen for Reheat cracking should be prepared.
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The procedure is : do cladding by SASC with high heat input,remove the clad till weld fusion layer is exposed and conduct MPI + Metallography.
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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 )
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I just needed more detailed information / procedure..
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Regards
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Prem Nautiyal
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On Fri, 29 Jan 2010 08:46:28 +0530 wrote
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Hi Prem,
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Could you be more specific about your query:-
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· 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.
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· 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.
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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.
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Due to copyright issue, I can not post the ASTM standard. However the attached article tells clearly how this test is performed.
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Thanks
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Pradip Goswami,P.Eng
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Senior Engineer/Specialist(Welding-Metallurgy)
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Engineering & Training Services Division
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ONTARIO POWER GENERATION Inc.
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PO Box-2000, RR-55(South)
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Nanticoke, Ontario,N0A1L0
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Tel:-(519) 587-2201, Ext 3107--in Nanticoke
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(416) 231-4111, Ext 5925--in Kipling,Toronto
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Fax:(519) 587-6814
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Email-pradip.goswami@opg.com.
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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of PREM SHANKARDUTT NAUTIYAL
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>Sent: Wednesday, January 27, 2010 1:20 PM
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>To: materials-welding@googlegroups.com
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>Subject: *****SPAM***** [MW:4160] Underclad cracking tests
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Dear All
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>Can anyone provide some article / explanation / detailed procedure about how to prepare specimens and conduct test for the following Underclad cracking test ---
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>1)Weld specimen for reheat cracking.
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>2)weld specimen for Hydrogen induced cracking.
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>The job is a PV, code of construction is ASME Sec III, NB.
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>Regards
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>Prem Nautiyal
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>PREM S NAUTIYAL
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>CELL : 9820313278
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For more options, visit this group's bolg at http://materials-welding.blogspot.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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PREM S NAUTIYAL
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CELL : 9820313278
PREM S NAUTIYAL
CELL : 9820313278
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To post to this group, send email to materials-welding@googlegroups.com
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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.
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