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一、旋转磁场(下称旋磁)探伤法用磁粉探伤方法,探测钢铁零件的表面缺陷,由于它简便易行,灵敏度高,在铁路工厂中,是一种常用的探伤手段。但是现行的磁力探伤设备存在如下问题。第一,对于钢铁零件上的纵向和横向裂纹,必须分两次磁化才能测出。第二,零件夹紧后不能转动,对于大的零件,底部缺陷不易观察,可能漏探。其原因是:它使用单相交流电,磁场是一个固定不动的单一磁场。如果把有一定相差的2～3个交流电,通入交叉的2～3个线圈,即能获得一个旋转的磁场。用于旋磁探伤时,为便于放进工
First, the rotating magnetic field (hereinafter referred to as gyromagnetic) detection method Magnetic particle inspection method to detect the surface defects of steel parts, because it is simple and easy, high sensitivity, in the railway plant is a common means of detection. However, the existing magnetic testing equipment has the following problems. First, longitudinal and transverse cracks on steel parts must be measured in two separate magnetizations. Second, the parts can not rotate after clamping, for large parts, the bottom of the defect is not easy to observe, may leak missed. The reason: It uses single-phase alternating current, the magnetic field is a fixed single magnetic field. If you have a certain difference between the 2 ~ 3 AC, access to cross the 2 to 3 coils, you can get a rotating magnetic field. For magnetic inspection, to facilitate the workers into