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一、问题提出目前,世界上只有美国和法国的两家公司采用直流漏磁法生产漏磁探伤设备。国内无损检测的主要方法有:磁粉法、涡流法、射线法、超声波等方法。但涡流探伤机,由于涡流磁场的趋肤效应,只能检测工件表面和近表面缺陷,难的检测工件内部缺陷超声波探伤需要,耦合剂等其它方面的原因,容易造成漏检,而漏磁探伤由于能检测铁磁性材料表面和内部的缺陷,从而成为铁磁性材料无损检测的发展方向。
First, the problem raised At present, only two companies in the world, the United States and France, use DC flux leakage method to produce magnetic flux leakage testing equipment. The main methods of non-destructive testing are: magnetic powder method, eddy current method, ray method, ultrasonic method. However, due to the skin effect of the eddy current magnetic field, the eddy current flaw detector can only detect the surface and near surface defects of the workpiece. It is difficult to detect the internal flaws in the workpiece due to the need of ultrasonic flaw detection and the coupling agent. Due to the detection of defects on the surface and the interior of ferromagnetic materials, it becomes the development direction of nondestructive testing of ferromagnetic materials.