Magnetic particle testing MT

A surface method for detecting discontinuities in ferromagnetic materials — fast, dependable and widely used in welding and foundry work.

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Magnetic particle testing MT equipment — a yoke flaw detector and an MPI bench in the X-TEST laboratory

Our equipment at work

Magnetic particle testing with full equipment

X-TEST has a complete set of magnetic particle testing equipment: from yoke flaw detectors and AC/DC current units to mobile MPI benches that work both on site and in the production hall.

We use both colour-contrast magnetic suspensions, visible in white light, and fluorescent ones under UV — which reveals even very fine surface and subsurface discontinuities.

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About magnetic particle testing

Magnetic particle testing (MT) detects surface and near-surface discontinuities in ferromagnetic materials.

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Method characteristics

Magnetic particle testing relies on magnetic flux leakage at a discontinuity. The method detects discontinuities at the surface and a short distance below it in ferromagnetic materials.

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How it works

The component is magnetised and a detection medium (an oil- or water-based suspension) containing ferromagnetic particles is applied to its surface. At a discontinuity a leakage field forms, attracting the particles into a visible indication. Evaluation takes place under white light or in a darkened area using UV-A radiation.

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Advantages of the method

  • High sensitivity to surface indications
  • Detects near-surface discontinuities
  • Fast inspection
  • Suitable for components of complex geometry
  • Works both in the laboratory and on site
  • Colour-contrast and fluorescent techniques available

MT techniques we use

Flux

Flux technique

Magnetisation with a yoke or a coil

The magnetic field is introduced into the component with an electromagnetic yoke or a coil. The technique allows local testing of components of various geometries and is particularly useful for inspecting welded joints and for work on site.

Equipment used:

  • AC/DC electromagnetic yokes
  • Rigid and flexible coils
  • Colour-contrast and fluorescent detection media

Typical applications:

  • Welded joints, castings and forgings
  • Components of complex geometry
  • Laboratory and on-site testing
Current

Current technique

Magnetisation by current flow

Electric current flowing through the component generates a magnetic field around it. The technique is particularly useful for detecting discontinuities oriented perpendicular to the magnetic field.

Equipment used:

  • AC/DC current units
  • Contact electrodes / contact systems

Typical applications:

  • Shafts and cylindrical components
  • Pipes
  • Forgings
  • Elongated components
Combined

Combined technique

Magnetic bench

A magnetic bench magnetises the component in different directions, for example by current flow and by the field of a coil. This makes it possible to find discontinuities of different orientations in a single inspection.

Equipment:

  • Magnetic bench
  • Current flow circuit
  • Coil for longitudinal magnetisation
  • Adjustable magnetisation parameters
  • White and UV-A lighting

Detection media:

  • Colour-contrast suspensions for evaluation under white light
  • Fluorescent suspensions for evaluation under UV-A radiation
  • Dry powders

Applications:

  • Series testing of castings and forgings
  • Machine components
  • Welded joints
  • Testing to the relevant standards and procedures

MT equipment we use

We have a complete set of equipment for every magnetic particle testing technique.

Magnetisation techniques

  • Flux magnetisation — AC/DC electromagnetic yokes, rigid and flexible coils
  • Current magnetisation — AC/DC current units with adjustable amperage, contact systems
  • Combined magnetisation — magnetic bench with a current flow circuit and a coil

Equipment and accessories

  • AC/DC electromagnetic yokes
  • Rigid and flexible coils
  • Current magnetisation and demagnetisation unit
  • Magnetic bench
  • Magnetic field strength / residual field meters
  • UV-A lamps
  • Lux meters
  • Test blocks
  • PN-EN ISO 17638:2017-01 — welded joints of pipes, sheets, structures*
  • PN-EN ISO 23278:2015-05 — acceptance levels
  • PN-EN 10228-1:2016-07 — forgings
  • PN-EN 1369:2013-04 — castings
  • Custom procedures per client requirements

* Standards within the scope of our accreditation (PCA certificate no. AB 1927).

Applications

  • Ferromagnetic materials: steel, cast steel, cast iron
  • Welded joints
  • Forgings
  • Castings

Need magnetic particle testing?

Write to us — we will match the technique and scope of inspection to your product.

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