The design project of the cast-iron crack of ENDT (Electronic Non-Destructive Testing) is put forward, according to the rule of magnetic permeability testing.

• 针对钢铁电磁无损检测中某些特殊钢铁材质检测结果不理想的情况,根据初始磁导率原理,提出了铸铁裂纹的电磁无损检测试验装置设计方案。