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!

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

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.

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.

Western Instruments Magnetic Yokes Videos