| 摘要 |
PROBLEM TO BE SOLVED: To provide an ultrasonic inspecting method and an ultrasonic inspecting apparatus, capable of simply and precisely measuring a height of a defect such as an aperture crack or the like on the rear surface of a welded zone in a stainless steel. SOLUTION: An oscillator 11 operating in a longitudinal wave oblique angle probe 10 is moved along a surface of a test object 100 in a direction of a plane carrying a transmission wave. Then, a B-scope image of a reception signal is displayed on a coordinate having axes of a probe position and a reception time or corresponding units, such that an image of a longitudinal wave, a transversal wave, a mode transformed wave and a creeping wave represents their trajectories. Reflection paths and reflection sources corresponding to above wave kinds are specified from relative positional relations of respective trajectories, and a position and a size of the defect are presumed. For example, in the case of the defect which is in communication with the bottom of the test object, the size of the defect is determined from appearances of the creeping wave, the mode transformed wave and the longitudinal wave or the transversal wave from the head edge section of the defect. COPYRIGHT: (C)2007,JPO&INPIT
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