使用磁力探伤车在线路上二次检查钢轨时发生的信号往往不准。目前多使用移动式超声波探伤器。在探测内部缺陷方面,它具有较高的灵敏度,但在冬季气温下降时使用困难。文中介绍全苏铁路运输研究院乌拉尔分院研制的二次检查用的移动式轻便型测铁探伤器。它利用 The signals that occur when using a magnetic inspection car to inspect the rail twice on the line are often not allowed. At present, more use of mobile ultrasonic flaw detector. It has high sensitivity in detecting internal defects, but is difficult to use in winter when temperature drops. This article describes all the Soviet Union Railway Transportation Research Institute Ural Branch developed for the second inspection with portable portable iron detector. It uses