WC-9UW
6
It must be noted that there is no demagnetization provision on the WC-9UW,
so parts will have some residual field in them after inspection. The workpiece
can be tested with a Magnetic Field Indicator, such as the W-Series W-FI
, to
measure the residual magnet field.
5. Operation:
Position the Pole Pieces (Feet) on the work piece. The area between the
pole pieces is your target area, which also extends laterally out,
approximately 1.5” (38mm), from either edge of the pole pieces. The Field
will expose defects that are transverse to the centerline between the Pole
Pieces. The Pole Pieces should be positioned so that as much of their
contact surfaces as possible, are on the work piece. The Yoke is then
energized, by pressing Push Button Switch, and Magnetic particles are
applied. Dry Method Particles are dusted between the Pole Pieces and over
the target area, while Wet Method Particles are sprayed in a similar manner.
The Target Area is then inspected visually for a collection of Particles around
defects. A Black Light is used to aid visual inspection when Fluorescent
Particles are used. Indications found with Dry Powder will tend to form
immediately, and will take slightly longer with Wet Method Particles. If the
typical direction of defects is not known, rotate the Yoke through 90º and
repeat the inspection of the target area.
The WC-9 produces a standard amount of Field Blow as other DC Yokes.
Field Blow is a collection of Inspection Media between the Pole Pieces,
transverse to the centerline between the Pole Pieces, and may cause a
masking of indications. Field Blow can be minimized by extending the Pole
Pieces farther apart, If work piece configuration does not permit extending
Pole Pieces, reduce the contact area of the Pole Pieces on the workpiece.
Follow the Operational Parameters outlined in these instructions
6. Maintenance –
While performing maintenance, or cleaning, the Yoke
should be disconnected from any power source, with safe industrial
practices employed.
After use the Yoke should be fully disassembled and cleaned with a mild
soap solution, and dried immediately. Drying can be accomplished rapidly by
heating the disassembled Yoke “Frame” (cast housing and articulating legs
only) in an oven below 150
°
F (70
°
C). The unit should be visually inspected
for any damage that could cause harm to the operator, or the material being
inspected. Included in the WC-9UW Kit is a supply of
LPS 3 Heavy Duty
Rust Inhibitor
, and after the unit has been cleaned and dried, the Pole Pieces
need to be coated to avoid rust. Furthermore, the Junction Tube, Battery
Collar, and Switch Plunger (all steel parts) should also be inhibited to avoid
corrosion.
All Electrical Connections; inside the Yoke’s Junction Tube; on the Battery
Pack; and both ends of Switching Module also need to be cleaned after every
