Western Instruments Magnetic Yokes

Magnetic Yoke is a hand held devices that induces a magnetic field between two poles. Common applications for the magnetic yoke are for outdoor use, remote locations and weld inspection. For proper inspection the yoke needs to be rotated 90 degrees for every inspection area to detect horizontal and vertical discontinuities. These systems used dry magnetic powders, wet powders, or aerosol cans.


Magnetic particle inspection (MPI) is a non-destructive testing (NDT) process for detecting surface and subsurface discontinuities in ferrous materials. The process puts a magnetic field into the part. The piece can be magnetized by direct or indirect magnetization. Direct magnetization occurs when the electrical current is passed through the test object and a magnetic field is formed in the material. Indirect magnetization occurs when no electrical current is passed through the test object, but a magnetic field is applied from an outside source (magnetic yoke). The magnetic lines of force are perpendicular to the direction of the electrical current which may be either alternating current (AC) or some form of direct current (DC) (rectified AC).


For a complete list of features and accessories, please check all our Magnetic Yokes models below. If you are having difficulties finding the product you need, feel free to contact us and a product specialist will be happy to assist you finding a quality Magnetic Yoke that fits at a great price!



lineYokes are the power tools for Magnetic Particle Inspection. These handheld electromagnets create a magnetic field in a Steel (Ferrous) work piece.line


Particle Mobility, are the forces that effect the movement of Magnetic Particles on the surface of the work piece. The higher the Particle Mobility the faster, and more reliable, the particle will congregate to a defect or a change in surface profile. Let us outline the fields produced by Yokes to help you understand the right Yoke for you.


AC AC/DC Safety & Premium Battery Powered Permanent Magnet Yokes Specialty
Models: Models Models Models Models Models
Western Instruments WE-3 Standard AC Yoke Western Instruments WE-7 Compact AC/DC Magnetic Yoke Western Instruments WC-6 Compact AC Magnetic Yoke Western Instruments WC-8 Compact 12 Volt Pulsed DC Magnetic Yoke Western Instruments WM-Series Permanent Magnet Yokes Western Instruments WC-6x2 High Lift AC Magnetic Yoke
Western Instruments WE-3HD Heavy Duty Standard AC Magnetic Yoke   Western Instruments WC-9 Cordless Magnetic Yoke Western Instruments WC-9 Cordless Magnetic Yoke Western Instruments W-PT Pull Test Bars Western Instruments W-6CS AC Cavity Yoke
Western Instruments WE-3LT Light Weight AC Magnetic Yoke   Western Instruments WC-42 European AC Safety Yoke Western Instruments W-PPS Portable Inverter Power Supply   Western Instruments WC-6UW Compact Underwater Yoke
Western Instruments WC-6 Compact AC Magnetic Yoke         Western Instruments WC-42 European AC Safety Yoke
Description: Description: Description: Description: Description: Description:
These fields provide the greatest particle mobility as the frequency of the power simply causes the Particle to vibrate. The polarity at each pole (leg) alternates from positive to negative at the same frequency as the electrical input current of 50 to 60 Hertz (pulses per second)

The fields provide is identical to those outlined above. The DC Portion from Yokes is a Phase Controlled pulse or rectified AC. The inductance of the Yoke’s Coil and Iron Core is enough that the Field induced into the material is Straight DC, with a slight ‘ripple’ due to the AC input frequency of 50 or 60 Hertz.


The AC Yokes Safety & Premium provide the most convenient safety to operators.  The Cordless Yoke provides the best mobility, for an Inspector or the NDT Technician. These yokes take the 12 Volts DC from the Battery and Chops the current, simply turning the field on and off at 125Hz. This Chopping of the electrical supply lowers the effective draw on the battery, thus extending the useful life of a charge. As the chopped current keeps re-energizing the coil, the flat level of the DC curve is interrupted creating a ripple effect that induces some particle mobility These yokes simply induce a magnetic field into the work piece, almost the equivalent of a full wave DC field. As a result there is no change in the strength or polarity (frequency) of the field, thus there is very low Particle Mobility When our regular Yoke is not enough we have created Specialty Yokes with the toughest jobs in mind. We have developed these Yokes to fill the needs of working with unusual and tight work piece configurations.


To summarize the Particle Mobility of Magnetic Fields induced by Yokes, our AC Yokes provide the best Particle Mobility, with AC/DC Yokes being second best, next is the Battery Operated Yokes with Permanent Magnet Yokes last. However, let us be mindful that a DC Field will highlight both surface and subsurface defects while AC only highlights surface indications. So in conclusion, a DC Field with a more pronounced collapse, between pulses, would be beneficial for increased Particle Mobility. We have a Yoke to address various needs of any operator.


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Western Instruments Magnetic Yokes Videos
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  • Western Instruments WE-3 Standard AC Yoke

    Western Instruments WE-3 Standard AC Yoke
    Price: $666.00 - $732.00

    Western Instruments WE-3 Standard AC Yoke
    Compact, Light Weight, Comfortable Grip, Standard Micro Switch, Urethane Rubber Grip, Durable & Economical
    Manufactured with an economical standard yoke switch
    Full current, not sealed switch type
  • Western Instruments WE-3HD Heavy Duty Standard AC Magnetic Yoke

    Western Instruments WE-3HD Heavy Duty Standard AC Magnetic Yoke
    Price: $688.00 - $743.00

    Western Instruments WE-3HD Heavy Duty Standard AC Magnetic Yoke
    Compact, Lightweight, Comfortable Urethane Grip, Slip-in Switch Cover, Standard Micro Switch, Rugged Strain Relief, Durable & Economical
    Full current, not sealed switch with Slip-in Switch Cover
  • Western Instruments WE-3LT Light Weight AC Magnetic Yoke

    Western Instruments WE-3LT Light Weight AC Magnetic Yoke
    Price: $875.00 - $930.00

    Western Instruments WE-3LT Light Weight AC Magnetic Yoke
    Ultra-Light Weight, Comfortable Urethane Rubber Grip, Slip-in Switch Cover, Standard Micro Switch, Rugged strain Relief & Durable
    Full current, not sealed switch with slip-in switch cover
  • Western Instruments WC-6 Compact AC Magnetic Yoke

    Western Instruments WC-6 Compact AC Magnetic Yoke
    Price: $765.00 - $820.00

    Western Instruments WC-6 Compact AC Magnetic Yoke
    Our most popular AC Yoke due to its lightweight and ease of handling.
    Comfortable ergonomic grip, Grounded solid state switch, Sealed Switch cover, Rugged strain relief
    Optional UL/CSA Approval
  • Western Instruments WC-6x2 High Lift AC Magnetic Yoke

    Western Instruments WC-6x2 High Lift AC Magnetic Yoke
    Price: $1,084.00 - $1,139.00

    Western Instruments WC-6x2 High Lift AC Magnetic Yoke
    Minimum Lift: 20 lbs (9.1 Kg)
    Our most popular AC Yoke due to its light weight and ease of handling.
    Comfortable ergonomic grip, Grounded solid state switch, Sealed Switch cover, Rugged strain relief
    Optional UL/CSA Approval
  • Western Instruments WC-6UW Compact Underwater Yoke

    Western Instruments WC-6UW Compact Underwater Yoke
    Price: $2,024.00 - $5,046.00

    Western Instruments WC-6UW Compact Underwater Yoke
    Developed for Underwater use
    Supplied with a Pig Tail
  • Western Instruments WE-7 Compact AC/DC Magnetic Yoke

    Western Instruments WE-7 Compact AC/DC Magnetic Yoke
    Price: $935.00 - $990.00

    Western Instruments Premium Compact AC/DC Yoke (Variable DC)
    Compact, Lightweight, Comfortable ergonomic grip, Grounded solid state switch, Sealed Switch cover, Rugged strain relief
    Optional UL/CSA Approval
    AC or DC Inspection Fields
  • Western Instruments WC-8 Compact 12 Volt Pulsed DC Magnetic Yoke

    Western Instruments WC-8 Compact 12 Volt Pulsed DC Magnetic Yoke
    Price: $930.00

    Western Instruments WC-8 Compact 12 Volt Pulsed DC Magnetic Yoke(Variable DC)
    Compact, Lightweight, Comfortable ergonomic grip, Grounded solid state switch, Sealed Switch cover, Rugged strain relief
    Optional UL/CSA Approval
    AC or DC Inspection Fields
  • Western Instruments WC-9 Cordless Magnetic Yoke

    Western Instruments WC-9 Cordless Magnetic Yoke
    Price: $1,293.00 - $1,436.00

    Western Instruments WC-9 Cordless Magnetic Yoke
    Complete Mobility
    Lightweight, Comfortable ergonomic grip, Grounded switch, Powerful lift, Urethane rubber encapsulation
    Optional UL/CSA Approval
  • Western Instruments WC-42 European AC Safety Yoke

    Western Instruments WC-42 European AC Safety Yoke
    Price: $820.00

    Electric Power Cord and mains plug
    Activation Switch and Switch Cover
    Yoke Legs and feet
  • Western Instruments WM-Series Permanent Magnet Yokes

    Western Instruments WM-Series Permanent Magnet Yokes
    Price: $633.00 - $688.00

    Western Instruments WM-Series Permanent Magnet Yokes
    Available in 3 models: Standard, Light & Compact and Cable Type
    Powerful lift, No recharging, Completely portable, Durable, Hinged frame and Cable type, Hazardous zones
  • Western Instruments LP-5C Low Profile Cable Type Permanent Magnet Yoke

    Western Instruments LP-5C Low Profile Cable Type Permanent Magnet Yoke
    Price: $627.00

    The Western Instruments LP-5C Low Profile Cable Type Permanent Magnet Yoke (Flex Mag)
    Designed so that you can achieve easier and more reliable contact to provide stress crack detection in any direction