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Technical Discussions
Andrés Gonzlaez
NDT Inspector
Colombia, Joined Oct 2002, 1

Andrés Gonzlaez

NDT Inspector
Colombia,
Joined Oct 2002
1
07:33 Nov-14-2002
Inspection of eddy current with Rotary scanner

I´m working at moment in inspections of holes with Eddy current ( Rotary Scanner ).
I have had many problems during the inspections in edges and layes interfaces in materials.of aluminium and steel
I want to find information about the inspections of eddy current with Rotary Scanner.
Somebody can help me with the following topics:

1. Filter adjustments for a good inspection.
2. Signal evaluation to be able to distinguish the crack indications from other variables.
3. Causes for indications that may be confused with cracks
4. General information about inspections with Rotary Scanner

Regards
Andrés G.



    
 
 
John
John
02:09 Oct-07-2017
Re: Inspection of eddy current with Rotary scanner
In Reply to Andrés Gonzlaez at 07:33 Nov-14-2002 (Opening).

Did you manage to obtain any information with regards to your question?

    
 
 
John Hansen
Director, - Eddy Current Technology
ETher NDE Ltd, United Kingdom, Joined Oct 1999, 73

John Hansen

Director, - Eddy Current Technology
ETher NDE Ltd,
United Kingdom,
Joined Oct 1999
73
12:21 Oct-07-2017
Re: Inspection of eddy current with Rotary scanner
In Reply to John at 02:09 Oct-07-2017 .

Hi

Boeing are about to release a new NTM for rotary hole inspection and Airbus have a pretty good NTM already.

1) The usual requirement is to set the LP filter 2.5 to 4 times higher than the HP and using a notch in a hole (or the Airbus type split standards) then set the notch response vertical and adjust the HP filter until you get a W on the time base (height of 2 negative parts equal). I understand some ec equipment cannot do the filter optimisation well owing to using incorrect types of filters.

2/3) cracks should be similar to the notch but rotated clockwise. Mechanical damage and corrosion rotated anti clockwise. Ferrous shims can give a very odd signal bit will not look like a notch or crack.

All the best

John Hansen MD - ETher NDE

    
 
 

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