Magnetic Partical Inspection (MPI) is used to detect casting, forging and weld surface defects such as hairline and fatigue cracks on in-service components.Magnetic particle inspection is a cost effective and efficient method of testing ferromagnetic components for discontinuities.In a fabrication environment it is used to locate surface and near surface weld defects.Magnetic Partical Inspection can also be used using fluorescent consumables and ultra-violet black lamps. This is a common technique for the inspection of turbine blades.Magnetic particle Inspection (MPI) is a non-destructive testing (NDT) process for detecting surface and slightly subsurface discontinuities in ferromagnetic materials such as iron, nickel, cobalt, and some of their alloys and must be performed to worldwide standards such as EN473 and ISO9712 by qualified personnel. The process puts a magnetic field into the part. The piece can be magnetized by direct or indirect magnetization. Direct magnetization occurs when the electric current is passed through the test object and a magnetic field is formed in the material. Indirect magnetization occurs when no electric current is passed through the test object, but a magnetic field is applied from an outside source. The magnetic lines of force are perpendicular to the direction of the electric current which may be either alternating current (AC) or some form of direct current (DC) (rectified AC).
