Testing of railway axes for longitudinal defects (defects in axial direction) is executed by a current flow transmitted through the axle, generating an encircling magnetic field. Testing for transverse defects (defects in encircling direction) is done with coil magnetization, moving the motor driven coil (with the front side shower ring activated) along the part. The implemented bi-directional magnetization with alternative activation of the two shower rings reduces the cycle time – avoiding extra time for a non-test return run of the coil.

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