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对国内外大量的球罐爆破事故分析表明,在球罐母材或焊缝上的表面裂纹,是引起球罐破裂的主要原因之一。采用磁粉探伤方法进行检验,是保证球罐施工质量和安全运转的一种主要检验手段。过去磁粉探伤是采用单方向磁化的极间式磁粉探伤方法(使用单相电激磁,简称单相磁化法)。该法只能灵敏地发现与磁力线方向成一定夹角(45°～135°)的缺陷,而平行于磁力线方向的缺陷则根本不能检出,因此对于同一探伤部位至少要进行两次(互相垂直的)磁
The analysis of a large number of dome explosion at home and abroad shows that the surface cracks on the base metal or weld of the sphere are one of the main causes of the fracture of the sphere. The use of magnetic particle inspection method for testing is to ensure the construction of the ball tank construction and safety of a major test means. In the past, magnetic particle inspection was an interdigital magnetic particle inspection method that used unidirectional magnetization (using single-phase electromagnetism and single-phase magnetization for short). This method can only detect the defects which are at an angle (45 ° ~135 °) with the direction of the magnetic line of force sensitively and the defects parallel to the direction of the magnetic line of force can not be detected at all. Therefore, the method must be performed at least twice Of) magnetic