Western Instruments WC-6X2 User manual

Operating Instructions
WC-6X2
High Output Compact AC Yoke
WC-6X2 Operation Manual 1
Established 1965

The WC-6X2 is a High Intensity AC Yoke, which induces a magnetic field into the
ferrous material being tested. The device should be used within the parameters set by
the operational specifications within this guide.
1. Solid State Push Button Switch – The Solid State Push Button
Switch was designed for comfort and safety. While depressed, the switch delivers
power (AC) to the coil encapsulated in the Yoke housing.
Output Module, where semiconductors are used to activate
e magnetization field.
e must
t to twist or ‘pinch’ wires, on either the mounting bar or End Cap.
The Solid State Push Button Switch provides a ½ Watt control signal to the
electronic controls in the
th
itch on when plugging the Yoke into power.Do not hold the Push Button Sw
2. End Cap Rotation – The End Cap may be rotated to reposition the Cord
Protector (Strain Relief), for operator convenience, within the Bottom 120º or Top
120º of the Junction tube. Carefully remove the End Cap, followed by the internal
Cross Bar, and reposition the power wires. Replace the cross bar, ensuring the
insulation disk (or tape) is in place and carefully reinstall the End Cap. Car
be taken no
Bottom Exit
Push Button
Switch Junction Tube
& End Cap
Module (inside
Junction Tube
Pole Pieces
Target Area
Crack Orientation
Ground Lug
(Not used)
Cross Bar
End Cap (Name
Plate and Fastener
not shown
)
Cord Protector/
Strain Relief
Module and
Insulating Tape
Junction Tube
Power Wires
White - Positive
Black - Ne
g
ative
Rear Leg
WC-6X2 Operation Manual 2

Top Exit
3. Operational Parameters –The Operational Parameters or Duty Cycle for the
operation is set to avoid damage to the internal coil or the Output Module, and must
be observed.
AC Operation: It is recommended that the operator does not keep the Yoke on for
more than 5 minutes at a time, as the Yoke housing may get to warm to hold.
However, the basic design of any Yoke inherently produces heat.
Typical operation is 5 - 15 seconds on, while applying inspection media, followed by
5 - 15 seconds off repositioning the yoke to the target area.
If the Yoke is used for prolonged periods of time such as 60 to 90 minutes of
continuous cycling, as outline above, the Yoke will get hot. If the WC-6X2 is used in
this manner the operator must provide time for a sufficient cooling period, or
components in the Electronic Control Module may fail.
Do not hold the Push Button Switch on when plugging the Yoke into power.
4. Field Characteristics
AC Field – AC Magnetic Fields are sensitive to surface and near surface defects
due to the ‘Skin Effect’ as the field travels from one Pole Piece to another. The WC-
6X2 is designed to produce a very strong AC field, to aid the operator while
inspecting though nonmagnetic coatings, or using extra scrutiny for inspecting
critical components. The Inspection Media (Dry Powder or Wet Method Particles)
has a tendency to migrate toward interruptions (or defects) in the field. The direction
and intensity of an AC Field, by it’s nature, alternates causing high particle mobility,
so defects tend to be revealed immediately.
.
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
WC-6X2 Operation Manual 3
End Cap (Name
Plate and Fastener
not shown
)
Cord Protector/
Strain Relief Ground Lug
(Not used)
Cross Bar
Junction Tube
Module and
Insulating Tape
Rear Leg
Power Lines
White – Positive
Black - Negative
.

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.
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 inspect of the target area.
As the WC-6X2 produces such a strong magnetic field, Field Blow will be higher
than on standard AC Yokes. Field Blow is a collection of Inspection Media between
the Pole Pieces in the target area, transverse to the centerline between the Pole
Pieces, and may case 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 work
piece. Follow the Operational Parameters outlined in these instructions.
6. Maintenance – After extended use the Yoke should be cleaned with a mild soap
solution. 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 adhered to the body of the
Yoke. The most common maintenance issue on any Yoke is the Power Plug, Power
Cord, and the End Cap/Cord Protector and should be checked on a regular basis to
ensure they are in a good state of repair. Our Web Site contains many write-ups
covering maintenance. While performing maintenance, cleaning, or repositioning
the End Cap 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.
Whether industrial specifications are being observed or not, the Yoke should be
tested periodically, using certified Pull Test Bars such as the W-Series W-PT®, to
ensure it continues to lift the specified amount of weight. If the unit fails such a test,
first inspect the Pole Pieces to ensure they fully contact the test weight. If the unit
continues to fail, contact the Distributor or Western Instruments for instructions on
corrective action.
Wiring – Western Instruments 230 Volt Models, are designated by a “K” placed
after the Serial Number and the Models number (e.g. WC-6K), are shipped without
WC-6X2 Operation Manual 4

an AC Power Plug as there is no international standardization. When installing an
AC Power Plug onto the AWG 18-3 Power Cord, the following is the identity of the 3
Color Coded Conductors;
•Green – Ground
•White – Neutral
•Black – Live
Care must be taken to insure the proper installation of an AC Power Plug, and if there
is any question, contact your distributor or Western Instruments. If an AC Plug in not
installed before use, any warranty is void.
7. Pull Test / Calibration
When performing a 20 Pound (9 kg) Pull Test, ensure the contact feet are flat as
possible to the Pull Test Bar (W-PT®), which ensures as much magnetic attraction as
possible. If a Yoke fails a pull test, it should be sent to an authorized repair facility for
Contact Foot Dressing.
Warranty
Western Instruments warrants its products, against defects in materials and workmanship for a
period of 1year from receipt by the end user. If Western Instruments receives notice of such
defects during the warranty period, Western Instruments will either, at it’s option, repair, replace,
or condemn products that prove to be defective. Consumable items, such as Batteries are
warranted for 30 days, from receipt by the end user.
Any warranty is void if the unit has been modified in any way, or if it has been repaired by an
unauthorized agency. The end user agrees that any equipment’s disposition, when returned for
warranty work, is at the full discretion of Western Instruments as to whether a claim is under
warranty, or due to misuse. Western Instruments warranty shall overlook normal wear, however
does not include operation outside the environmental specification of the product. All warranty
work is FOB Western Instruments, and any returned units shall include a written description, by
the end user, of the fault.
Western Instruments makes no other warranty, either expressed or implied, with respect to this
product. Western Instruments specifically disclaims any liability arising form the use of this
equipment. For the correct use of the product, refer to the Operating Instructions, furthermore
we recommend instructional training to CGSB, ASNT, or other regulatory authority
qualifications. Western Instruments highly recommends the end user exercise all possible
safety precautions, including use of protective equipment, while operating this or other industrial
equipment.
Specifications:
Model: WC-6X2 or WC-6X2K
Voltage: 115VAC or 230VAC
Frequency: 50 or 60 Hz
Current: AC – 7.0 Amps @115 Volts or 4 Amps @230 Volts
Capacity: <20 Pounds (9.2 Kg)
Pole Spacing: 0 – 11” (0 – 280mm)
Weight: 7.2 Pounds (3.3 Kg)
WC-6X2 Operation Manual 5

Yoke NomenclatureYoke Nomenclature
Western Instruments
WC-6X2 Operation Manual 6
Established 1965
Rear End Cap
Covers Junction Tube Housing Hand Grip Protects Internal Coil Switch Cavity Hidden from View
Name Plate
Model, Serial
Number, Volts,
Amps, Frequency
Cord Protector
(Strain Relief)
Power Cord
(AWG18-3 SOOW)
Rear Leg
Assembly
(Pole Pieces)
Front Foot
Upper Leg
Front Leg
Assembly
(Pole Pieces)
Upper LegRear Foot
Established 1965