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01:40 Feb-27-2010

QI

Engineering
China,
Joined Feb 2010
5
About the detecting depth using UT technique for austenitic stainless steel and nickel base alloy

What is the maximum detecting depth? For example,
a 400mm thick plate, material as Incoloy 800H.

 
09:45 Feb-27-2010

S.V.Swamy

Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex ,
India,
Joined Feb 2001
784
Re: About the detecting depth using UT technique for austenitic stainless steel and nickel base alloy In Reply to QI at 01:40 Feb-27-2010 (Opening).

Your question is not clear. Did you mean the feasibility of getting a back wall echo from a 400 mm thick Incoloy 800H plate?

If that is what you meant, it is possible using the right probe and instrument combination.

Or are you interested in detecting a discontinuity in such a plate? If this is what you meant, the size of a discontinuity that can be detected depends on several factors including the surface condition, grain size etc. Planar indications of a smaller diameter can be detected compared to spherical / round indications but there can be exceptions too! Since you are discussing a plate, it is expected that both the surfaces are accessible and thus the metal path that needs to be detected is a little more than half the thickness, thus about 250 mm in your case.

If you clarify the question / application, better answers will come.

Regards

 
10:50 Feb-27-2010

William Blum

Consultant, Training, Level III Services
NDT Consulting Group Inc.,
USA,
Joined Nov 2000
89
Re: About the detecting depth using UT technique for austenitic stainless steel and nickel base alloy In Reply to QI at 01:40 Feb-27-2010 (Opening).

You could always take a piece of scrap, create a "defect" like that you must find, then try to find it. If you do that and find the defect you have qualified your procedure.

Bill
NDT Level III
NDT Consulting Group Inc.
www.ndt-cgi.com

 


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