RAIL-PURPOSE ULTRASONIC WAVE FLAW DETECTION TOOL, RAIL-PURPOSE ULTRASONIC WAVE FLAW METHOD OF RAIL TOE, RAIL QUALITY ASSURANCE METHOD, AND RAIL MANUFACTURING METHOD

To provide a rail-purpose ultrasonic wave flaw detection tool, ultrasonic wave flaw detection method of a rail toe, rail quality assurance method, and rail manufacturing method that can surely conduct ultrasonic wave flaw detection of a rail toe.SOLUTION: A rail-purpose ultrasonic flaw detection tool 1 comprises: a foot sole facing part 2 that is arranged facing a sole surface 62a of a foot part 62 of a rail 60, and fixes a probe 50 of an ultrasonic wave flaw detector; a foot arch facing part 3 that is arranged facing a foot arch surface 62b of foot part 62, and is equipped with a fixation mechanism 30 fixing the rail-purpose ultrasonic flaw detection tool 1 movably in a longitudinal direction of the rail with respect to the foot part 62; and a connection part 4 that connects the foot sole facing part 2 and the foot arch part 3. In the foot sole facing part 2, a penetrating opening 21 into which the probe 50 is inserted is formed, and a formation position of the opening 21 serves as a position where an ultrasonic wave oscillation surface 51 formed at a tip end of the probe 50 is contactable with the foot sole part 62a of the foot toe part 64 part.SELECTED DRAWING: Figure 3 【課題】レールの足先部の超音波探傷を確実に行うことができるレール用超音波探傷治具、レールの足先部の超音波探傷方法、レールの品質保証方法、及びレールの製造方法を提供する。【解決手段】レール用超音波探傷治具１は、レール６０の足部６２の足裏面６２ａに対向配置されてなるとともに、超音波探傷器の探触子５０を固定する足裏対向部２と、足部６２の足甲面６２ｂに対向配置されてなるとともに、レール用超音波探傷治具１を足部６２に対してレールの長手方向に沿って移動可能に固定する固定機構３０を備えた足甲対向部３と、足裏対向部２と足甲対向部３とを接続する接続部４とを備える。足裏対向部２に、探触子５０が挿入される貫通した開口２１が形成されてなるとともに、開口２１の形成位置を、挿入された探触子５０の先端に形成された超音波発振面５１が足先部６４の足裏面６２ａに接触可能な位置とする。【選択図】図３