Method for locating machining position in repair material, and repairing method

A method for locating a machining position in a repair material that is arranged on a member including a previously machined portion, the method comprising:

• a step of arranging a marker including a portion having a different propagation characteristic of an ultrasonic wave from that of a peripheral portion in the previously machined portion before the repair material is arranged on the member, said marker configured to correspond to the size of the previously machined portion;
• a step of removing a portion of the member after the marker is arranged in the member;
• a step of arranging the repair material on the member;
• and
• a step of applying the ultrasonic wave to the member covered with the repair material to detect the size of the marker and to locate the machining position at a position of the marker captured by the ultrasonic wave after the repair material is arranged on the member.