Magnaflux Universal SW Series Operating Manual page 8

Circular magnetisation with current flux
When using circular magnetisation with axial current
flux, the magnetising current flows through the work-
piece [3]. Magnetisation intensity is dependent on the
current flux through the workpiece.
Current flux creates a magnetic circular field within
the workpiece [2]; this circular field allows detection of
longitudinal cracking in the workpiece.
The magnetising current can be continually adjusted
and is displayed on a gauge on the control cabinet as
RMS value.
1. Contact attachment on the left sleeve
2. Circular magnetic field arising from the current flux
3. Workpiece with current flux
4. Contact attachment on the right sleeve
5. Transformer
Circular magnetisation with current-carrying conductor
NOTE: For this type of magnetisation, you need an
additional magnetising mandrel. Please contact the
sales department of Magnaflux GmbH.
In circular magnetisation with a current-carrying
conductor, the magnetising current flows through a
conductor, e.g. a magnetising mandrel [2]. The current
flow of the conductor generates a circular magnetic
field [2] within the conductor. If the conductor is intro-
duced into a circular or tubular workpiece, the circular
field [3] is transferred to the workpiece [4].
Intensity of magnetisation depends upon the current
flux through the conductor. The circular field enables
the detection of longitudinal cracks in the workpiece.
The magnetising current is displayed on a gauge on
the control cabinet as effective value.
1. Contact attachment with magnetising mandrel
2. Circular magnetic field in the conductor
3. Circular magnetic field in the workpiece
4. Workpiece with circular magnetic field
5. Contact attachment.
6. Transformer
Longitudinal magnetisation with coil
When using longitudinal magnetisation with a coil, the
magnetising current flows through a coil [2], creating
circular magnetic fields around the individual conduc-
tors. These fields combine to a common longitudinal
field inside the coil [1]. The longitudinal field is trans-
ferred to the workpiece inside the coil.
The magnetic field flows through the workpiece [3] in
a longitudinal direction. The longitudinal field enables
the detection of transverse cracks in the workpiece.
The magnetising coil can be mounted so that it can be
moved along the entire length of the workpiece during
the magnetisation process. This allows for magnetisa-
tion of very long workpieces.
The magnetising current is displayed on gauge on the
control cabinet in kAW, as the product of the current
and the number of turns of the coil.
1. Longitudinal magnetic field in the coil and workpiece
2. Magnetisation coil
3. Workpiece
4. High current transformer
5