What is Magnetic Particle Testing?

How is Magnetic Particle Testing Performed?

1. Surface Preparation
   The component to be inspected is cleaned from dirt, oil, paint, or other surface contaminants. Proper cleaning is essential to obtain accurate and reliable results.

   2. Magnetization
   The part is magnetized using an appropriate magnetic source. This creates a magnetic field within the material. Discontinuities interrupt the magnetic field and cause flux leakage, which enables defect detection.

   3. Application of Magnetic Particles
   Fine magnetic particles (dry powder or wet suspension) are applied to the surface. These particles accumulate at areas where magnetic flux leakage occurs, indicating the presence of defects.

   4. Inspection
   Accumulated magnetic particles form visible indications around cracks or discontinuities. Inspection may be performed under visible light or ultraviolet (UV) light when fluorescent particles are used.

   5. Evaluation
   The indications are evaluated by a certified technician or engineer. The size, orientation, and severity of detected defects are assessed according to applicable standards.

   6. Cleaning and Reporting
   After completion of the test, the surface is cleaned and demagnetized if required.
   The results are documented in inspection reports or certification records.

Magnetic Particle Testing (MT) is a non-destructive testing (NDT) method used to detect surface and near-surface defects in ferromagnetic materials. In this method, the material is magnetized, and fine magnetic particles are applied to its surface. These particles accumulate around areas where magnetic flux leakage occurs, forming visible indications of defects.

Magnetic Particle Testing is widely used to identify surface cracks, seams, laps, and other discontinuities in ferromagnetic components and plays a critical role in quality assurance processes across various industries.