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Technical Discussions
Steve K
USA, Joined Aug 2017, 5

Steve K

USA,
Joined Aug 2017
5
21:02 Aug-21-2019
Flux Flow Coils

I have a customer that's looking into a magnetic wet bench that can conduct multi-directional magnetizations. Instead of using traditional coils he talked about using something called 'flux flow coils'. I've never heard of this before. Can anyone give me more information about this?

 
 Reply 
 
George Hopman
Consultant,
NDE Solutions, USA, Joined Apr 2009, 45

George Hopman

Consultant,
NDE Solutions,
USA,
Joined Apr 2009
45
18:31 Aug-26-2019
Re: Flux Flow Coils
In Reply to Steve K at 21:02 Aug-21-2019 (Opening).

Magwerks out of Indianapolis has the best unit out there. I suggest contacting them.

 
 Reply 
 
Rick Lopez
R & D,
John Deere - Moline Technology Innovation Center, USA, Joined Jul 2011, 191

Rick Lopez

R & D,
John Deere - Moline Technology Innovation Center,
USA,
Joined Jul 2011
191
17:11 Aug-27-2019
Re: Flux Flow Coils
In Reply to Steve K at 21:02 Aug-21-2019 (Opening).

Steve,
I first saw this term used in two of Donald Hagemaier's 1991 Materials Evaluation articles where he promoted the use of these, and predicted a future move away from the traditional magnetizing coil when performing multi-directional and 3-D magnetization. Your question indicates how this forecast has fared thus far.

The idea behind them seems relatively simple, as they are coils wrapped around copper-covered laminated steel cores situated at the headstock and tailstock on a wet bench. The claim was that a more consistent longitudinal magnetization was possible across fairly long distances as opposed to more limited distances with a traditional coil. At least a few current vendors offer them as an option, but opinions on maximum length of usefulness seems to vary considerably (range seems to be from 20" up to 48"). I believe there has also been some exploratory work on the effect of having the two flux flow coils working together and opposing each other.

 
 Reply 
 
John Brunk
Engineering, NDT Level III
Self employed, part-time, USA, Joined Oct 1999, 162

John Brunk

Engineering, NDT Level III
Self employed, part-time,
USA,
Joined Oct 1999
162
23:14 Aug-27-2019
Re: Flux Flow Coils
In Reply to Rick Lopez at 17:11 Aug-27-2019 .

I have had very good experience with flux flow machines for relatively small parts such as bolts from 0.25” diam, 1” length to 0.75” diam, 8” length. Part I’ve was limited by maximum distance between the contacts.

 
 Reply 
 

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