Mpt cracking team12/7/2022 Prior to each magnetic particle examination, the surface to be examined and all adjacent areas within at least 1 in. Therefore, AC should not be used for subsurface discontinuities. The primary difference between the two currents is the fields generated by DC penetrate the cross section of the part, and the fields generated by the AC are confined to the metal at or near the surface of the part. Typical types of discontinuities that can be detected by this method are cracks, seams, laps, cold shuts Direct current (DC) and alternating current (AC) are both suitable for magnetizing parts for MT. The sensitivity is greatest for surface discontinuities and diminishes rapidly with increasing depth of subsurface discontinuities below the surface. Magnetic particle techniques thus allow the detection of surface breaking cracks in steel objects of complex geometry, which typically is a challenge for RT methods. The Magnetic Particle Testing or Examination method may be applied to detect cracks and other discontinuities on or near the surfaces of ferromagnetic and electrically conductive materials.
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