Magnetic Particle Inspection

Discover Discontinuities in Ferrous Materials Before It’s Too Late

Surface and subsurface discontinuities in ferrous materials can lead to machinery and production shutdowns, but they are often not easy to spot in time.

TÜV Rheinland offers magnetic particle inspections (MPI) – a nondestructive testing (NDT) process for detecting these discontinuities. With state-of-the-art multidirectional MPI equipment, we can determine a part’s serviceability or conformity, saving you future costs and delays.

Our personnel are trained and certified in multiple standards and are capable of analyzing the best method of nondestructive testing for your product.

Benefits at a Glance

With our magnetic particle inspection, you benefit by:

  • Saving and expediting production capabilities before costly machining
  • Preventing failures that occur from flawed parts that make it into assemblies without inspection
  • Gaining a lead against the competition with a neutral audit seal
  • Reducing risk of company liability with documented safety standards
  • Showing how high your high-quality standards are
  • Enjoying fast audit times and our exclusive, one-stop service
  • Ensuring compliance with local governmental and legal requirements

Products Covered

Our services cover ferrous materials.

Our Magnetic Particle Testing Services

TÜV Rheinland’s magnetic particle testing services detect surface and subsurface discontinuities in ferrous materials.

Approach

The Magnetic Particle 3D machine is used for a wide variety of inspections. The machine has a head shot, coil shot and field flow for a complete magnetizing field. The three fields that are induced into the part allow for all parts small and big. When a part is energized, a fluorescent particle bonded with an iron particle in a suspended bath is pored over the part. The particles then collect on the areas of the part that have a flux leakage. All indications are then evaluated by a level II MT technician.

After the part is examined, it is then put through another coil that demagnetizes the part with reversing AC current. After this process is completed, the parts will be completely flaw free and packed accordingly to the customers need.

More Information

Magnetic particle inspection (MPI) is a non-destructive testing (NDT) process for detecting surface and subsurface discontinuities in ferrous materials. The process puts a magnetic field into the part that can be magnetized by direct or indirect magnetization. Direct magnetization occurs when the electrical current is passed through the test object and a magnetic field is formed in the material. Indirect magnetization occurs when no electrical current is passed through the test object but rather when a magnetic field is applied from an outside source. The magnetic lines of force are perpendicular to the direction of the electrical current, which may be either alternating current (AC) or some form of direct current (DC, or rectified AC).

The presence of a surface or subsurface discontinuity in the material allows the magnetic flux to leak. Ferrous iron particles are applied to the part being tested. The particles may be dry or in wet suspension. If an area of flux leakage is detected, the particles are attracted to this area.

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