Sunday, January 1, 2012

RE: [MW:13379] REGARDING Impact test of VESSEL PRODUCTION TEST COUPON

Hi

 

//I
have tested a stress relieved PTC Impact test on weld & HAZ AT -47
DEG.//

 

Hope you have used Full size specimen. (10x10mm). But the material specification is missing. If it is SA 516 Gr 70, you need 20J average. In these assumed conditions you test is acceptable. BUT…

 

// PTC has failed again I have  done  reheat treatment & Retest with
same cycle of the job.//

 

So, you have done retreatment. Is it done on the same PTC or with another PTC?.

 

If reheat done on the same PTC which failed earlier, then the PTC might have received two heat treatment cycles, which is not simulating to your vessel heat treatment conditions. This is not acceptable. [refer UG-84(h)(4) & QW 407.2]. Check whether your WPS covers the T &T range.

 

If reheat treatment done on another PTC, then the test is OK.

BR

M.Vijayan

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Karthik
Sent: Wednesday, December 28, 2011 10:28 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:13348] REGARDING Impact test of VESSEL PRODUCTION TEST COUPON

 

Hi,

As per ASME Sec.VIII,Div.1-UG84, 

The minimum impact energy for one specimen shall not be less than 2⁄3 of the average energy required for three specimens. The average impact

energy value of the three specimens may be rounded to the nearest J.

 

 

Thanks & Regards,

 

(Karthik)

 

Karthikeyan.S

QA/QC Manager

Getabec Energy Co.,Ltd.

379,Moo6,Soi8,Nikhomphatana,

Rayong-21180,

Thailand.

Phone: 0066 38 897035-8 (Off)

Fax: 0066 38 897034

Hand Phone: 0066 892512282

 


From: Harish Kannepalli <harishkannepalli@gmail.com>
To: materials-welding@googlegroups.com
Sent: Wednesday, December 28, 2011 12:08 AM
Subject: Re: [MW:13334] REGARDING Impact test of VESSEL PRODUCTION TEST COUPON

Dear Vivek,

                70% of required average is ok, ur values r ok to pass the PTC.

2011/12/27 Vivek Pandey <vivek.pande06@gmail.com>

Respected All,


I want your suggestion about Impact test of vessel production test, I
have tested a stress relieved PTC Impact test on weld & HAZ AT -47
DEG. PTC has failed again I have  done  reheat treatment & Retest with
same cycle of the job. PTC has failed in one indivzual value by 1
joule.Value is like this way 28, 19, 34.


Is there any acceptance criteria as per ASME SECTION VIII DIV 1. other
wise all weld of category A B C D to be gauged & reweld.

Kindly solve my query as soon as possible



Regards
VIVEK PANDEY

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--

regards,

Harish.

 

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