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Technical Discussions
John Galt
John Galt
05:26 May-28-2009
MPI swing fields

Could someone please explain to me what a "swing field" is and how it relates to magnetic particle inspection?

I'm doing my MPI level 2 exam next month and someone told me this subject was on their written portion (CGSB exam).

I'm having trouble finding the info in my text books and online so any explanation or links to online info would be greatly appreciated, thanks!

    
 
 
Rolf Diederichs
Director,
NDT.net, Germany, Joined Nov 1998, 605

Rolf Diederichs

Director,
NDT.net,
Germany,
Joined Nov 1998
605
08:25 May-28-2009
Re: MPI swing fields
In Reply to John Galt at 05:26 May-28-2009 (Opening).

In NDT A-Z is written:

http://www.ndt.net/ndtaz/ndtaz.php?id=611
Swinging Field Magnetization
Related Entries: Multi-Directional Magnetization,

Description:
Special equipment allows two or more currents in different directions to be applied simultaneously. This permits locating discontinuities in more than one direction and shortens inspection time.

Edward Ginzel created: 1999-12-11

    
 
 
Robert J. Nitka
Robert J. Nitka
05:33 Dec-08-2014
Re: MPI swing fields
In Reply to John Galt at 05:26 May-28-2009 (Opening).

In reply to John Galt

There's a great paper on this subject that can be found at
www.insight-ndt.com/papers/technical/t002.pdf. One note, the author often refers the swing field changing vector direction 50 times/sec. In the US, this would be 60 times/sec.

    
 
 
langtuteng
Armenia, Joined Nov 2014, 158

langtuteng

Armenia,
Joined Nov 2014
158
12:51 Dec-09-2014
Re: MPI swing fields
In Reply to John Galt at 05:26 May-28-2009 (Opening).

normally, we use two kinds of current simultaneously, one is AC and the other is DC. we use AC to generate the direction of the magnetic field which is changing all the time. thus, the swing field forms.

    
 
 

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