Ultrasonic flaw detection method, ultrasonic flaw detection device, steel manufacturing equipment, steel manufacturing method, and steel quality control method

摘要

The ultrasonic flaw detection method is an ultrasonic flaw detection method that transmits an ultrasonic signal from an ultrasonic probe to an inspection material, and receives an ultrasonic signal reflected from the inside of the inspection material as a reflected signal in the ultrasonic probe, thereby inspecting the inside of the transfer material. A receiving step of receiving a reflected signal from the ultrasonic transducer while changing the position of the ultrasonic transducer, an extraction step of extracting a defect signal that is a reflection from a defect in the inspection material from the reflected signal received in the receiving step, an expected sound pressure; Defect due to a virtual defect, including a defect shape estimation step of estimating the shape of the defect from the received sound pressure obtained from the intensity of the defect signal extracted in the extraction step, wherein the expected sound pressure is expected from the ultrasonic directivity of the ultrasonic probe is the strength of the signal.