Friday, July 4, 2014

[MW:21325] RE: 21320] Lamellar tearing

Hello Karthi Keyan,
 
Lamellar tear is extremely difficult to detect. It's the final stage of failure. Good UT techniques  such as TOFD could detect major defects such as inclusion shape and distribution and major indications such as lamination. Note always lamination does not mean failure by lamellar tear.
 
One good way to prevent lamellar tear is asking for "z" direction tensile properties, % EL  of 25% or more helps to prevent such failures, in addition to manufacturing route for clean steel. I do not have the reference handy, however from earlier experience in "Offshore projects" I've seen this Z direction tensile requirements for thick plates.
 
Hope the attached links will help you to understand the subject.
 
Thanks
 
Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Specialist
Ontario, Canada
 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com]
Sent: Thursday, July 03, 2014 12:09 PM
To: materials-welding@googlegroups.com
Subject: [MW:21320] Lamellar tearing

In which NDT method we can find lamellar tearing.........
 
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karthi keyan

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