PortalWet Fluorescent
Particles suspended in liquid, interpreted under ultraviolet light. Offers higher sensitivity for fine discontinuities.
Surface and Subsurface Method
Magnetic Particle Testing (MT)
Detection of surface and near-surface discontinuities in ferromagnetic materials using a magnetic field.
ASTM E709ASME V Art. 7SNQC
The Process
How It Works
Magnetic Particle testing (MT) identifies surface and slightly subsurface discontinuities in ferromagnetic materials. The part is magnetised and fine ferromagnetic particles are applied to the surface; where a discontinuity exists, the magnetic field leaks and attracts the particles, forming a visible indication of the flaw.
In the Field
Photo Record
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Applicable Techniques
Types and Variants
Dry Method
Powder particles applied dry, suited to field inspection of rough surfaces or at high temperatures.
Yoke (Electromagnet) Magnetisation
Portable contact equipment, widely used for field weld inspection.
Coil Magnetisation
Suited to detecting longitudinal discontinuities in cylindrical and tubular components.
When to Use
Where We Apply It
- Welds in carbon and low-alloy steel
- Forged and cast ferromagnetic components
- Field weld inspection
- Detection of fatigue cracks
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