Evaluation of fluorescent magnetic particle indications

Inspection materials as well as equipment and procedures and can be illustrated by a development for magnetic particle inspection (MT). MT of welds has conventionally meant wet-method fluorescent magnetic particle testing (WFMT). WFMT is a most effective means of locating and clearly defining the size and shape of cracks or discontinuities, especially those open to the surface of a ferromagnetic object. This process involves the use of an ultraviolet light source which causes iron/oxide particles treated with a fluorescent pigment to emit a striking yellow-green color. The particles are drawn to any defects magnetically. Particles are manufactured in accordance with stringent guidelines regarding size and sensitivity. Because the visibility of the yellow-green color can be drastically reduced by any ambient visible light, there are established maximum limits for visible light at the surface of the object being inspected.