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HXD3D型机车采用了15号小间隙车钩,结合段修规程要求,在进行车钩探伤时发现,15号车钩钩舌销末端螺纹部因截面面积变化,且螺牙间距小,干法连续法磁粉检测受螺纹结构特点限制,目视可达性差,不能满足现场实际要求。湿法检测时需将螺栓置于磁力探伤机纵向磁化线圈中,也可采用绕电缆法进行纵向磁化。该方法表面裂纹灵敏度很高,裂纹显示直观,但因齿部间隙较小,磁化时根部会因聚集较多磁悬液,齿尖漏磁吸附磁粉等原
HXD3D locomotive with a small gap 15 car coupler, combined with the repair section of the program requirements, the car hook flaw detection found that the No. 15 coupler hook pin end thread due to changes in cross-sectional area, and the thread pitch is small, dry continuous magnetic particle testing Due to the characteristics of the thread structure, visual accessibility is poor and can not meet the actual requirements of the site. Wet testing need to be placed in the magnetic longitudinal magnetization testing machine magnetizing coil can also be used around the vertical magnetization cable method. The method of surface crack sensitivity is high, the crack shows intuitive, but the tooth gap is small, the magnetization of the root due to the accumulation of more magnetic suspension, the tip magnetic leakage flux magnet