Magnetic particle testing - Practical aspects : Magnetic particle testing: definition and principle

Magnetic particle testing: definition and principle
Magnetic particle testing - Practical aspects

Authors : Stéphane GRAVELEAU, Pierre CHEMIN

Publication date: June 10, 2022 | Lire en français

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1. Magnetic particle testing: definition and principle

1.1 Definition and field of application

Magnetic particle testing (symbol MT) is a NDT method that is the logical extension of visual testing (symbol VT). It can be used to highlight surface and sub-surface discontinuities in ferromagnetic materials.

This tried-and-tested method is particularly useful in two areas of NDT application: plant maintenance and parts inspection.

Plant and structure maintenance (nuclear, petrochemical, etc.)
- Applications:
  - welding inspection on pipelines or pressure vessels;
  - inspection of steel structures such as cranes, bridges...

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Magnetic particle testing: definition and principle