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Magnetic Metal Memory method (MMM)

Currently, the MMM method is respected and used widely in the world. It is used to control all industrial facilities and to control any elements made of ferromagnetic or paramagnetic metals, including austenitic steel (stainless steel). These controls are also carried out during the creation of industrial facilities or in the production processes of components, as well as during their operation.

The Magnetic Memory Method is an extremely effective method of non-destructive testing, allowing to evaluate the stress-deformation state of industrial facilities or their elements in real time.

The MMM method is a passive method of non-destructive testing, based on the recording and analysis of the distribution of self-magnetic leakage fields (Polish - WMPR), formed in products and equipment in stress concentration zones (Polish - SKN). During the tests using the MMM method, natural magnetization is used, which appears in the form of its own magnetic fields scattered during actual deformations resulting from the operation of the components.

The MMM method provides: 

  • identification of local magnetic anomalies of the tested object
  • correlation of detected magnetic anomalies with stress state, load history and local change of texture and material phases (overheating, deformation, fatigue)
  • detection of structural defects (inclusions, voids, cracks, etc.)
  • evaluation of the current technical condition of the component with the possibility of reliable forecasting of their safe operation time.

The benefits of using the MMM method are:

  • revealing in a real-time (also on large objects) the stress concentration zones (SKN) as future damage locations
  • early fault diagnosis and estimation of the quality of the component
  • detection of defects in welded joints and heat affected zones (Polish - SWC)
  • considerable reduction of material costs of the client using the MMM method in combination with conventional NDT methods

Photos from the implementation of research using the MMM method