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Technical Discussions
dinesh pal
dinesh pal
09:21 Jan-11-2008
problem in eddy current testing

dear all,
i m facing problem in one ET system that i usually got magnetism effect in the graph.actually i m detecting defect in metal sheet which is steel.I have 3 graph i.e. spall. pinch& magnetism which is seperated by filter ckt.

could anyone suggest me any way to bring me out from this problem


    
 
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Elmar van den Elzen
Engineering,
Lismar Engineering B.V., Netherlands, Joined Aug 2000, 15

Elmar van den Elzen

Engineering,
Lismar Engineering B.V.,
Netherlands,
Joined Aug 2000
15
03:36 Jan-12-2008
Re: problem in eddy current testing
Dear Dinesh,

If you have magnetism signals, the first thing to do would be to check if the plate you are testing is really magnetic or not. The best would be to demagnetize the plate with a hand held unit or a demagnetizing tunnel. If you do this properly, your magnetism signals should be gone and you can see if the EC-signal is clean or if still defects are being indicated or not.

Regards, Elmar

----------- Start Original Message -----------
: dear all,
: i m facing problem in one ET system that i usually got magnetism effect in the graph.actually i m detecting defect in metal sheet which is steel.I have 3 graph i.e. spall. pinch& magnetism which is seperated by filter ckt.
: could anyone suggest me any way to bring me out from this problem
------------ End Original Message ------------




    
 
 Reply 
 
Michael Moles †2014 *1948
, Joined ,
07:35 Jan-13-2008
Re: problem in eddy current testing
----------- Start Original Message -----------
: dear all,
: i m facing problem in one ET system that i usually got magnetism effect in the graph.actually i m detecting defect in metal sheet which is steel.I have 3 graph i.e. spall. pinch& magnetism which is seperated by filter ckt.
: could anyone suggest me any way to bring me out from this problem
------------ End Original Message ------------
Have you considered using an eddy current array? They are much faster - and also give better imaging. I suggest you contact your local Olympus NDT rep.





    
 
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