QUANTITATIVE QUALITY INDICATORS (QQI)
Artificial flaw shim standards for MPI increase productivity by minimizing magnetizing “shots.” Placed on part surface to verify field direction and relative strength. Particularly useful for balancing multi-directional fields. Approved by major specifications including ASTM E 1444 (replaced MIL-Std-1949A).
Basic circular and crossed bar flaw configuration, suitable for longitudinal and circular fields. .0006″ flaw depth amounts to 30% of shim thickness.