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Technical Discussions
Jason G.
Jason G.
03:22 Apr-27-2007
ToFD

I know when using ToFD that you lose near surface resolution due ti the Lateral Wave riding just under the surface.
Do you also lose ID resolution as well and how affective is ToFD for detecting transverse indications?


 
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Ed Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1285

Ed Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1285
04:43 Apr-27-2007
Re: ToFD
Jason:
The dead zones are reasonably estimated using the equations provided in EN583-6. We have provided a simple TOFD calculator for this in a 2006 edition of ndt.net
http://www.ndt.net/article/v10n06/ginzel/ginzel.htm

As for transverse detection. Yes, it can be used to detect transverse flaws but the degree of rotation of the flaw expected will determine the rotation you need on the TOFD probe pair. Some flaws, like chevron cracks, MAY be detected with the normal arrangement with the beam perpendicular to the weld. Other orientations may require skewing of a TOFD pair or ideally, removing the weld cap and scanning with the beam parallel to the weld axis.
Ed

----------- Start Original Message -----------
: I know when using ToFD that you lose near surface resolution due ti the Lateral Wave riding just under the surface.
: Do you also lose ID resolution as well and how affective is ToFD for detecting transverse indications?
------------ End Original Message ------------




 
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