Noise Reducing Method for Wire Rope Inspection Using Magnetic Flux Leakage Testing

In the inspection of wire ropes, the leakage flux flaw detection method is used as a method to supplement the visual inspection. This method can distinguish the damage by detecting the magnetic flux leaking from the damaged part using a magnetic sensor. However, since the wire rope has a complicated shape, the magnetic flux leaks even from the undamaged part. This magnetic flux becomes noise when a small flaw is detected. In addition, there is a disposal standard for wire ropes, and the allowable number of strand breaks per strand is determined. Therefore, it is necessary to grasp the damage condition of each strand. In this study, an inspection method of moving magnetic sensor along the strand was investigated to reduce noise and to grasp damage of each strand. The experimental results show that this inspection method is effective for evaluating the soundness of wire ropes.