制作目的随着我国造船工业及机械制造工业的不断发展,在产品质量日益提高的基础上,利用磁性探伤方法来发现机械零件表面和近表面的细微裂纹方面显示了无比的优越性,从而成为各厂矿企业乐于采用的一种无损试验方法。目前,我国已能自行生产各种新型的磁性探伤仪,但由于需要量大,市场供不应求,而且每台仪器价格昂贵,这对于有些中小型企业来说尚无力为 Production purposes With the continuous development of China’s shipbuilding industry and machinery manufacturing industry, the increasing quality of products on the basis of the use of magnetic detection method to find the mechanical parts of the surface and near the surface of the fine cracks showed excellent superiority, which became the Factory and mining companies are happy to adopt a non-destructive test method. At present, our country has been able to produce all kinds of new-type magnetic flaw detectors. However, due to the large amount of demand and the shortage of the market, each instrument is expensive, which is still too weak for some small and medium-sized enterprises