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Magnetic Particle Testing (MT)

Assess the Integrity of Ferromagnetic Materials

What is magnetic particle testing?

Magnetic particle testing (MDT) is a nondestructive testing technique for detecting imperfections and discontinuities in iron, nickel and other types of ferromagnetic materials. When subjected to either direct or indirect magnetization, a material imperfection at the surface or subsurface level of a ferromagnetic material under test “leaks” magnetic flux, and serves as a point of attraction for ferrous iron particles. The accumulation of particles helps inspectors to locate and identify these material imperfections, allowing for further evaluation and analysis.

What are the advantages of magnetic particle testing?

Magnetic particle testing is a fast, simple, inexpensive and highly portable NDT technique for detecting fine or shallow surface cracks in pipes and fixtures made of ferromagnetic material. It is a versatile evaluation technique that can be used to detect imperfections on test specimens of widely varying shapes and sizes. Further, the use of magnetic particle testing does not require extensive surface preparation of testing materials. In fact, it can be used to detect discontinuities even through thin exterior coatings.

Why use TÜV SÜD for your magnetic particle testing requirements?

For more than 30 years, the TÜV SÜD name has been synonymous with quality inspection services in the energy and chemical industries. We’re a leading provider of both NDT and advanced NDT testing and inspection services, and our laboratories and testing facilities can perform quality inspections on almost any form of ferrous material. TÜV SÜD can also conduct NDT and advanced NDT testing and analysis services at customer site locations and in the field to provide our clients with maximum flexibility.

TÜV SÜD magnetic particle testing services include:

  • Wet fluorescent magnetic particle testing - This MDT technique uses extremely small iron oxide pigment particles (less than 0.5 to 10 micrometres in size) immersed in water or oil, and which can be viewed under ultraviolet light. Wet fluorescent magnetic particle testing can be used in wet or dry conditions.
  • Dry powder magnetic particle testing - This technique uses larger iron oxide particles (5 to 170 micrometres in size) that are normally applied manually and which can be viewed under white light conditions. Dry powder magnetic particle testing is not intended for use in wet conditions.

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