|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
© 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 |