What is one of the most common defects that MPI can reveal?

Magnetic Particle Inspection (MPI) is particularly effective at detecting surface cracks, which are one of the most common defects it reveals. This method works by applying a magnetic field to a ferromagnetic material and dusting it with magnetic particles. When there are surface discontinuities, such as cracks, the magnetic field is disturbed, causing the magnetic particles to cluster at the defect's open edges. This results in a visible indication that can be easily recognized, allowing for quick assessment of structural integrity.

While MPI can also be used in the detection of other types of defects, such as internal fractures, corrosion damage, and welding defects, its primary strength lies in exposing surface defects. Surface cracks are frequently present in materials due to various stresses and fatigue during use, making MPI a vital tool for quality assurance and safety in many industries.