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NDT.net Issue - 2015-05 - NEWS

Rapid Detection of Cracks and Corrosion using Magnetic Stray Flux


Fraunhofer-Institute for Non-Destructive Testing (IZFP)447, Saarbrücken [Germany]
NEWS  
NDT.net Journal
Issue: 2015-05
Whether it's fallen concrete pylons caused by corroded tension wires, a new motor due to damaged pistons or defective sheet steel, even the tiniest cracks or smallest traces of corrosion can have serious consequences, especially in safety-critical environments. With magnetic stray flux inspections, these flaws can be quickly visualized without destroying or contaminating the material. As an alternative to magnetic powder tests, this method can also be used wherever the magnetic powder approach is unsuitable.


FLUXI: handheld stray flux inspection device (prototype shown) © Fraunhofer IZFP

Engineers at Saarbrucken-based Fraunhofer IZFP will be introducing a mobile handheld device for magnetic stray flux testing at the 29th annual CONTROL trade fair in Stuttgart (hall 1, exhibit booth 1502), which runs May 5 to May 8.

Scientists at the Fraunhofer Institute for Nondestructive Testing IZFP in Saarbrucken have developed a handheld, wireless test device called FLUXI which is based on magnetic stray flux technology. This method relies on the same physical effect exploited by magnetic powder testing, a standard and widely-used inspection process in steel manufacturing. When an external magnetic field is applied to sharp-edged cracks on the surface of a component, additional magnetic dipoles form, which then induce magnetic leakage near the surface. This stray field can be detected and processed with magnetic field sensors.

The enormous potential for instrument technology miniaturization provides a key advantage since extremely difficult to access areas of the component can be quickly and easily subjected to magnetic stray flux inspections. With FLUXI, manufactured parts and components can be rapidly scanned, allowing potential surface defects to be displayed as images.

Fraunhofer IZFP will be introducing a prototype of the handheld instrument at this year's CONTROL trade fair. Engineers will demonstrate the functionality by moving the device over the surface of small test object with defects. The sensor sends the data to a laptop via Bluetooth, where the results appear almost in real-time as a grayscale image on the laptop screen.

For further information: Sargon Youssef, M. Sc. | Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren IZFP | Telefon +49 681 9302-3997 | Campus E3.1 | 66123 Saarbrücken | www.izfp.fraunhofer.de | sargon.youssef@izfp.fraunhofer.de

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