Magnetic particle testing is a non-destructive method to find surface and shallow subsurface flaws in ferromagnetic materials like iron and nickel. It works by magnetizing the part and applying magnetic particles; these particles cluster at any discontinuities, making them visible as cracks, voids, or other defects. The test only works for materials that can be magnetized and requires the magnetic field to be perpendicular to the defect for optimal detection. How it works Magnetization: The part