Testing PROCESSES
Magnetic Particle Testing (MT)
Magnetic Particle Testing (MT) is a non-destructive testing (NDT) method used to detect surface and near-surface discontinuities in ferromagnetic materials, such as steel and iron alloys. The process relies on magnetizing a component and then applying fine magnetic particles. These particles gather at areas of flux leakage caused by defects, making cracks, seams, laps, or inclusions visible to inspectors.
How the Test is Performed
Preparation – The fastener or machined component is cleaned to remove oil, grease, and debris.
Magnetization – A magnetic field is applied to the part, either directly (passing current through the component) or indirectly (using a magnetic yoke or coil).
Application of Magnetic Particles – Fine iron particles, either dry or suspended in liquid, are applied to the surface.
Indication of Defects – If a discontinuity is present, it distorts the magnetic field, causing particles to cluster at the flaw.
Inspection – Inspectors examine the part under visible light or ultraviolet light (if fluorescent particles are used) to identify and interpret defect indications.
Post-Test Cleaning – The component is demagnetized and cleaned after inspection.
Why It is Performed
Magnetic Particle Testing is performed to ensure that fasteners and machined components are free from cracks or other surface-connected flaws that could compromise performance. Because many engineered fasteners are used in high-stress, safety-critical environments, even a small crack can propagate and lead to premature failure. MT is a fast, cost-effective, and highly sensitive method for detecting these flaws before components enter service.
Detects surface and slightly subsurface cracks, seams, and laps
Ensures quality and safety of ferromagnetic components
Provides quick, reliable results to support efficient production and inspection cycles
Application to Engineered Fasteners
For engineered fasteners, surface and near-surface integrity are critical. Fasteners experience extreme loads, cyclic stresses, and environmental exposure in industries such as aerospace, oil & gas, and nuclear power. A small crack or seam undetected at the surface can become the origin of a failure under load.
By applying Magnetic Particle Testing, WN Global ensures:
Fasteners are free of surface defects that threaten strength and reliability
High-performance components meet industry and customer requirements
Confidence in the long-term durability of fasteners used in safety-critical applications
Standards & Compliance
At WN Global, Magnetic Particle Testing is carried out in strict accordance with ASTM, ASME, and customer-specific standards. Our inspectors are qualified to recognized NDT certification programs, ensuring consistency and accuracy in every inspection. Adhering to these rigorous standards demonstrates our commitment to quality, builds customer confidence, and ensures that our engineered fasteners and machined components perform reliably in the world’s most demanding industries.
Testing Processes
DOING WHATEVER IT TAKES
Putting Manufacturing Exellence Into Practice
The manufacturing processes, testing capabilities, and quality systems featured throughout WN Global support the production of critical components and engineered fastening solutions across demanding industries. Connect with our team to learn how our manufacturing capabilities can support your project requirements.
