NM01MTNDTCM230

The Western Instruments QQI’s Quantitative Quality Indicators is artificially flawed low carbon steel specimens that are used in magnetic particle inspection (MPI). They are used to establish, and assuring, the proper magnetic field is achieved to produce indications of flaws in ferromagnetic parts. It must be emphasized that Western Instruments QQI’s Quantitative Quality Indicators are themselves flawed parts, so that when they are placed in an appropriate magnetic field, indications will appear when magnetic particles are applied. Western Instruments QQI’s Quantitative Quality Indicators are manufactured strictly in accordance with applicable AMS specification.

All Western Instruments QQI’s Quantitative Quality Indicators are nominally ¾" square. The miniature configuration (CM-230) are intended to be cut into individual specimens for application in small radii and tight places. The 3 concentric circles, have depths of 40% in the inner circle, 30%, 20% on the outer circle. Use of the 3 Circle types will effectively pinpoint applicable current density to produce optimal indications. The typical 30% depth of indications. on all other Western Instruments QQI’s Quantitative Quality Indicators. is usually sufficient to indicate a Hall Effect Gauss Meter reading of 30 when such a reading is required by specification.

The hermetically sealed package should be left in place until ready for use. The low carbon steel (AISI 1005) will readily corrode in typical plant or laboratory environments. All QQI’s are coated with an inert material, approximately 0.005 mm thick, that should be removed before application. The coating appears to have a pinkish cast under black light, but will not interfere with indications forming.

It is strongly recommended that once opened QQI’s be stored in a solvent, such as isopropyl Alcohol. If being applied to a workpiece with Anaerobic Adhesive (Super / Crazy Glue), both the part and QQI must be clean and dry before application.

The Western Instruments QQI’s Quantitative Quality Indicators selected must be placed in intimate contact with and flaw side next to the part to be evaluated. QQI’s must be securely fastened, on all four sides, so that inspection media can not gain access in the bond line. A part, with affixed QQI’s’, can be used for process control for monitoring adequate light, contrast, bath concentration, and other inspection attributes.