WE-7 Operating Instructions
5
Demagnetization –
Small Parts may be demagnetized by positioning the contact
surfaces of the Pole Pieces together, activating an AC Field and pass the part
through the opening formed between the Legs and Yoke Housing. Larger Work
Pieces can be demagnetized by placing the Yoke on the surface, in a similar
manner used during inspection, activating an AC Field and pull the Yoke off the
surface. The work piece can be tested with a Magnetic Field Indicator, such as
the W-Series W-PT
, to ensure it is fully demagnetized.
6.
Operation:
Select the desired field on the WE-7, and 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 surface as possible is in contact with the work piece. The
Yoke is then energized, by pressing the 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 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 and an AC Field will tend to form immediately,
and will take slightly longer with Wet Method Particles. While using a DC Field,
Dry Method particles behave similar to AC, but Wet Method Particles tend to flow
far slower requiring a longer activation time. If the typical direction of defects is
not known, rotate the Yoke through 90º and repeat the inspection of the target
area. Follow the Operational Parameters outlined in these instructions, and
again;
Do not change the FIELD SETTING while the unit is activated
.
7. Maintenance
After extended use the Yoke should be cleaned with a mild soap solution and
thoroughly dried. The unit should be visually inspected for any damage that
could cause harm to the operator, or the material being inspected. Special
attention should be paid to the Push Button Switch Cover, to ensure it is fully
inserted to the groove cast in the Switch Cavity. Furthermore, the Power Plug,
Power Cord, Strain Relief, and the Junction End Cap should be in a good state of
repair. Before performing maintenance or the Yoke should be disconnected from
any power source, with safe industrial practices employed. Any potential
problems to these assemblies must be reported to the Distributor or Western
Instruments for instructions on corrective action.
If there is a failure in the Control Printed Circuit Board, the Control Panel may be
removed. Repairs to this component are not a field fix (as illustrated bellow),
even if an extra Board is on hand. Replacement requires fine tools, and
