2. FUNCTIONS AND PROCEDURES
2.1 OVERVIEW OF TEST PROCEDURES
Different inspection processes are possible depend-
ing on the specification of your machine - see page 1
of this manual.
Variant 1
• includes manual spraying
• no
magnetising coil
Variant 2
• includes manual movable magnet-
ising coil
• includes manual spraying or ring
shower (option)
Variant 3
• includes motor-driven magnetising
coil
• includes manual spraying or ring
shower (option)
2.2 INSERTING AND CLAMPING WORKPIECES
Workpieces are inserted into the workpiece supports
by the operator or a suitable device, and removed
again after inspection.
Workpiece supports
Suitable supports for diverse workpieces are available.
In addition to fixed workpiece supports, the following
options are also possible:
• Roller block with manual drive
• Fixed supports with additional workpiece turning
devices.
Contact the sales department at MAGNAFLUX GmbH
for more information.
Workpiece clamping units
Depending on the type of workpiece and feed, the
workpiece may be clamped differently.
• clamping on the left sleeve only
• clamping devices on the left and right sleeves
1. Clamping unit (pneumatic or electric)
2. Left sleeve
3. Workpiece
4. Right sleeve, mounted on carriage
5. Clamping unit (pneumatic or electric)
6. Sleeve carriage
Right sleeve without clamping unit
In the standard version, the right sleeve is permanently
mounted on a manually movable carriage, allowing the
distance between sleeves to be adjusted to the work-
piece length.
Optionally, a clamping unit can also be installed on the
right sleeve. As with the standard version, the distance
between the sleeves is adjusted by moving the carriage.
2.3 MAGNETISING THE WORKPIECE
NOTE: Where the magnetic powder method is used,
only those parts of the workpiece that have been treat-
ed with testing agent can be examined. It is not possi-
ble to detect cracks at contact points and surfaces.
Requirements for magnetisation
• Workpiece in magnetising position.
• Control on.
• The magnetisation circuit is powered.
• The magnetising intensity (magnetising current) is set
to a value of minimum 10% of the maximum value.
Magnetisation in automatic operating mode
As soon as the workpiece arrives in the magnetisation
station, it is clamped between the two sleeves. The
sleeves contact the workpiece and close the circuit for
the axial current flow.
If a magnetising coil is installed, this is moved around
the workpiece by hand or motor during magnetisation.
The magnetisation process comprises two phases:
• Spraying of test liquid and magnetisation (spraying
time)
• Magnetisation after spraying
Magnetisation is complete when the after-spray mag-
netisation time has lapsed. Magnetic particles will have
collected in any cracks, making them clearly visible.
Demagnetisation in automatic mode
After magnetisation, the magnetising current is reduced
to zero along an e-function, thereby demagnetising
the workpiece.
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