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We offer on-site magnetic particle inspection services using yoke type prod type and coil type magnetizing equipment, dry powder, wet magnetic particles & wet fluorescent magnetic particle technique.
This NDT method is accomplished by inducing a magnetic field in a ferromagnetic material and then dusting the surface with iron particles (either dry or suspended in liquid).Surface and near-surface flaws produce magnetic poles or distort the magnetic field in such a way that the iron particles are attracted and concentrated. This produces a visible indication of defect on the surface of the material. Therefore, the method is most applicable for detecting the surface or sub-surface defects. Magnetic particle can be applied in various types depending on the applications required. It could be wet, powder or fluorescent.
Applications :
  • Most weld discontinuities open to or near the surface
  • Most suitable for cracks, laps, seams, voids, pits, subsurface holes, and other surface or slightly subsurface, discontinuities in ferromagnetic materials

Advantages :
  • Relatively economical and expedient
  • Test equipment is considered portable
  • Unlike liquid penetrant, magnetic particle can detect some near surface discontinuities
  • Can inspect through thin coatings

Limitations :
  • Application only to ferromagnetic materials as well as to surface or near-surface flaws
  • Parts should be clean before and after inspection
  • Thick coatings may mask rejectable indications
  • Some applications require parts to be demagnetised after inspection
  • Magnetic particle test requires use of electrical energy for most applications
  • Some potential for arc strikes on surface