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Magnetic Particle Inspection (MPI) is one of the most effective Non-Destructive Testing (NDT) methods for detecting surface and near-surface discontinuities in ferromagnetic materials. Selecting the right magnetic yoke is essential to ensure accurate inspection results, improved productivity, and compliance with industry standards.
1. Power Source
• AC Yokes: Ideal for detecting surface-breaking cracks and discontinuities.
• DC Yokes: Provide deeper magnetic field penetration, enabling detection of both surface and near-surface defects.
2. Adjustable Leg Spacing
Choose a yoke with adjustable legs to accommodate various component sizes and geometries. A wider adjustment range offers greater flexibility during field inspections.
3. Portability and Ergonomics
For on-site inspections, lightweight and durable yokes reduce operator fatigue and improve efficiency. The ideal weight of an AC, AC/DC & the Battery-Operated yoke would be between 3-5 Kg (6.5-11lbs) and for permanent magnetic Yoke between 2-3 Kg (4.5-6.5lbs).
4. Technical Specification of the Yoke:
For reliable MPI inspection EN ISO 9934-3 standard given below specifications regarding yoke:
|
Sr. No. |
Specifications |
Min Requirements |
|
1 |
Duty Time |
≥ 10% |
|
2 |
On Time |
≥ 5 sec. |
|
3 |
Surface Temp. of Handle |
≤ 40°C |
|
4 |
Tangential Field Strength |
≥ 2kA/m |
|
5 |
Lifting Power |
45N |
5. Compliance with Standards
Ensure the yoke meets applicable industry standards such as ASTM E709 ASTM E 1444, ASTM E3024, ASME B&PVC SEC V, ISO 3452 & other relevant MPI requirements.
AC Magnetic Yoke AY-7A
The AY-7A Yoke is a powerful AC magnetic particle inspection yoke, available in 230V/50Hz and 110V/60Hz variants, designed for reliable surface crack detection. Its adjustable leg spacing (65–260 mm center-to-center).
AC/HWDC Magnetic Yoke AY-7D
The AY-7D is most versatile magnetic yoke which offers AC and HWDC single phase supply for magnetizing ferromagnetic material. The two outputs (AC or HWDC) are independently adjustable to balance the magnetic field intensity.
Permanent Magnetic Yoke Fixed/Wire Type AY-M5-F/AY-M5-W
Permanent Magnetic Yoke Fixed/Wire types are ideal for MPI since they are completely portable & are used where access to AC power is impractical or impossible. It is easy to use, simple & highly Economical.
Battery Operated Yoke AY-7B
Battery operated yoke is designed to stand up to the most rugged applications. True portability for magnetic particle inspection in the field and remote locations is achieved through a battery pack.
Selecting the correct MPI yoke depends on the inspection requirements, material geometry, power source, and applicable standards. Investing in the right equipment helps improve defect detection reliability, inspection efficiency, and overall quality assurance.
