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:
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:
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.
We hold the following MT equipment: