Non-destructive testing and Integrity Engineering services

Magnetic Particle Testing (MT)


Magnetic Particle Testing (MT)


Magnetic particle examination is a cost effective and efficient method of testing ferromagnetic components for discontinuities that are near or open to the surface. Magnetic particle testing is widely used throughout various industries to locate surface and near surface defects such as cracks, laps, seams, inclusions, voids and pits. This techniques can be performed in-house or in the field on a wide variety of manufactured materials and components. At NICKEL we utilize magnetic particle testing to inspect:

  • New fabrication welds for code compliance
  • Castings, forgings, valves and their components, machined parts, pressure vessels, storage tanks, cranes and structural steel welds
  • In-service welds and components

Magnetic particle testing works by magnetizing a ferromagnetic specimen using a magnet or special magnetizing equipment. If the test object has a discontinuity, the magnetic field flowing through it is interrupted and leakage field occurs. Magnetic particles applied to the surface of a specimen are attracted to leakage fields and cluster to form an indication directly over the discontinuity. The indications are visually detected under proper lighting conditions which allow a qualified inspector to assess location, size, shape and extent of these imperfections.

Magnetic particle inspection comprises the following basic steps:

  1. Pre-cleaning of component
  2. Magnetization of test object
  3. Application of magnetic media
  4. Interpretation of magnetic particle indications

It is crucial that particles have an unconstrained path for migration to both strong and weak leakage fields. Therefore, the test object should be clean and dry before beginning the inspection process. The presence of oil, grease or scale may compromise the inspection.

Advantages of Magnetic Particle Testing Method

  • Fast method of inspection. Immediate indications are visible directly on the specimen surface
  • Very good sensitivity to fatigue cracking, hydrogen induced cracking, and stress corrosion cracking
  • Very portable inspection especially when used with battery powered equipment
  • Can detect both surface and near subsurface indications, and these are the most serious ones as they concentrate stresses
  • The method can be adapted for site or workshop use
  • Considered low cost compared to many other NDT techniques
  • Large or small objects with irregular shapes can be examined easily



Our MT equipment


We hold the following MT equipment:

  • Electro Magnetic Yokes MAGNAFLUX Y-6
  • JAM Magnet Permanent Magnetic Yoke
  • LABINO UV led lamps
  • Magnetic particles test pieces and referent blocks by MAGNAFLUX
  • Magnetic particle testing consumables and aerosols by MAGNAFLUX

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Our operational headquarter is based in Malabo, the capital of Equatorial Guinea. We are dedicated to providing and promoting excellence and reliability in our services to our noble clients.

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