Magnaflux provides leading manufacturers and NDT testing facilities around the globe with the most comprehensive and proven line of liquid penetrant and magnetic particle materials, equipment and accessories, aerospace approved aqueous cleaners, and ultrasonic NDT couplants.
Magnaflux Magnetic Particle Magnetic particle Inspection (MPI) is a non-destructive testing (NDT) process for detecting surface and slightly subsurface discontinuities in ferroelectric materials such as iron,nickel, cobalt, and some of their alloys. The Magnaflux 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).
Magnaflux Dye penetrant inspection (DPI), also called liquid penetrant inspection (LPI) or penetrant testing (PT), is a widely applied and low-cost inspection method used to locate surface-breaking defects in all non-porous materials (metals, plastics, or ceramics). The Magnaflux penetrant may be applied to all non-ferrous materials and ferrous materials, although for ferrous components magnetic-particle inspection is often used instead for its subsurface detection capability. Magnaflux LPI is used to detect casting, forging and welding surface defects such as hairline cracks, surface porosity, leaks in new products, and fatigue cracks on in-service components.
Magnaflux DPI is based upon capillary action, where low surface tension fluid penetrates into clean and dry surface-breaking discontinuities. Magnaflux penetrant may be applied to the test component by dipping, spraying, or brushing (critical to apply evenly). After adequate penetration time has been allowed, the excess penetrant is removed, a developer is applied. The developer helps to draw penetrant out of the flaw where an invisible indication becomes visible to the inspector. Inspection is performed under ultraviolet or white light, depending upon the type of dye used -fluorescent or nonfluorescent (visible).