By analysis of magnetic leakage effect, discusses magneticpowderdetection principle and application range, borrowing physical module.
通过分析漏磁场的狭缝效应，并借用已有物理模型，探讨磁粉探伤原理模型和应用范围。
2
There is defects on the surface and near surface of the bolt in canned motor pump because of manufacturing technique. So, we adopt magneticpowderdetection of faults to inspect it.