where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

357 views
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 
 

Product Spotlight

Cygnus 6+ PRO Multi-Mode Ultrasonic Thickness Gauge

The Cygnus 6+ PRO thickness gauge is the most advance gauge within the Cygnus range with key featu
...
res including: comprehensive data logging; A-scan and B-scan display; manual gain control; Bluetooth connectivity; and much more. With its unique dual display and three measuring modes (Multiple-Echo, Echo-Echo and Single-Echo), this surface thickness gauge offers maximum versatility for inspections.
>

Immersion systems

ScanMaster ultrasonic immersion systems are designed for high throughput, multi shift operation in a
...
n industrial or lab environment. These fully integrated systems provide various scanning configurations and incorporate conventional and phased arrays technologies to support diverse applications, such as inspection of disks, bars, shafts, billets and plates. All of ScanMaster immersion systems are built from high accuracy scanning frames allowing for scanning of complex parts and include a multi-channel ultrasonic instrument with exceptional performance. The systems are approved by all major manufacturers for C-scan inspection of jet engine forged discs. Together with a comprehensive set of software modules these flexible series of systems provide the customer with the best price performance solutions.
>

ISAFE3 Intrinsically Safe Sensor System

ISAFE3 intrinsically safe sensor system of Vallen Systeme is especially targeted at the petrochemica
...
l - as well as oil and gas transportation industry. The sensor system is designed for permanent monitoring or periodic inspection tasks. Sensors are available for different AE-frequency ranges optimized for corrosion and fatigue crack detection and other applications. The ISAFE 3 sensor system consists of an AE-sensor (model ISAS3) certified according to ATEX/IEC for installation in zone 0, gas group IIC, IP68, 20 to +60 °C, and a signal isolator (model SISO3) certified for installation in zone 2. An ISAS3 sensor can be mounted in atmosphere or submerged, e.g. in water or crude oil. It is supported by mounting tools for temporary (magnets) or permanent (welded) installation. ISAFE3 supports automatic sensor coupling test and can be used with any AE signal processor supporting 28V supply at 90 mA peak, e.g. Vallen Systeme ASIP-2/A.
>

Sci Aps Z-Series Portable Handheld Analysers

The world’s only handheld analyzer that measures carbon content in stainless (yes even L-grades),s
...
teels, and cast irons. Also accepted for low Si analysis for sulfidic corrosion analysis, and is widely used in the power industry for Cr analysis, for flow accelerated corrosion applications.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window