Softened Structure Detection Method, Remaining Life Estimation Method, And Inspection Object Selection Method

Abstract: This softened structure detection method for detecting a softened structure in an inspection object of a weld metal by using ultrasonic flaw detection comprises: a first flaw detection step for performing ultrasonic flaw detection of causing a first ultrasonic beam to enter into an inspection object along an inclination direction from at least one oblique angle probe to thereby acquire a reflection wave of the first ultrasonic beam returning to the oblique angle probe; a second flaw detection step for performing ultrasonic flaw detection of causing a second ultrasonic beam to enter into the inspection object along the inclination direction from a transmission-side probe to thereby acquire a reflected wave of the second ultrasonic beam received by a reception-side probe disposed opposite to the transmission-side probe across the weld metal; and a determination step for determining the presence or absence of a softened structure in the inspection object, on the basis of the ultrasonic flaw detection result of the first flaw detection step and the ultrasonic flaw detection result of the second flaw detection step.

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