在火力发电厂中,联箱与支管管座角焊缝结构不合理或焊缝内部存在缺陷,在交变应力的影响下会产生裂纹,引发泄漏,从而导致机组非计划停运。磁记忆法通过对部件表面漏磁场的检测,可以有效检测管座角焊缝中存在的缺陷,减少泄漏现象的发生。 In coal-fired power plants, the structure of fillet welds of header and branch pipes is not reasonable or there are defects in the weld seam. Cracks will be generated under the influence of alternating stress, which will lead to leakage and lead to unplanned shutdown of the unit. The magnetic memory method detects the leakage magnetic field on the surface of the component, which can effectively detect the defects existing in the fillet weld at the pipe seat and reduce the occurrence of leakage.