Magnetic Yokes Machine Magnetic Particle Testing (MPT) is one of the most widely used non-destructive testing (NDT) methods for the detection of surface and near-surface flaws in ferromagnetic materials. The Magnetic Yoke Machine is considered one of the more popular tools used for MPT due to its portability, ease of operation, and efficacy. What is a Magnetic Yoke Machine? A Magnetic Yoke is a handheld or portable device that generates a magnetic field using either AC (Alternating Current) or DC (Direct Current). It consists of a U-shaped or C-shaped core with adjustable legs and an electromagnetic coil. Generally, once energized, it induces a magnetic field into the test piece, allowing the inspectors to check for cracks, seams, and other defects using magnetic particles. Types of Magnetic Yokes AC Yokes: Best for detecting surface cracks due to shallow penetration. DC Yokes: These offer deeper penetration and allow for identification of subsurface flaws. Permanent Magnetic Yokes: These employ strong magnets instead of electricity and are suited for hazardous environments. Electromagnetic Yokes: These require power (battery or mains) and offer adjustable strength. Advantages of Magnetic Yokes Portable and lightweight: Suitable for carrying anywhere for site inspection. Fast Setup: No additional preparations are needed. Versatile: Suitable for flat, curved, or irregular surfaces. Cost-effective: In contrast to more sophisticated NDT equipment, it is an inexpensive option. How to Use a Magnetic Yoke? Clean All Surfaces – To do this, you need to remove rust, paint, and dirt. Apply Magnetic Particles – You spray dry or wet particles. Place the Yoke – Put the legs over the area to be inspected. Magnetize and Inspect – Turn on the yoke and look for accumulation of particles at defects. Demagnetizer – Preventing residual magnetism. Conclusion The Magnetic Yoke Machine is portable, easy to use and economic test equipment for detecting surface cracks on ferromagnetic materials. It is best suited for inspection in welding, aerospace and manufacturing, ensuring quicker and more confident defect detection thereafter.