Ishikawajima-harima Heavy Industries Co., Ltd.

Takahiro Arakawa

Hiroaki Hatanaka

Saburo Shibata

Kazuo Yoshikawa

Yoshimichi Atsuta

In the ultrasonic flaw detection method and apparatus, wideband longitudinal ultrasonic waves are irradiated from an ultrasonic wave generator probe onto a weld portion of a coarse grained material; from the waveforms of flaw detection echoes that are subsequently obtained, the highest frequency component that can be extracted using time frequency analysis is then extracted; subsequent &frac12; magnification frequency components are then extracted sequentially; waveforms of a necessary plurality of frequency bands from among each of the frequency bands that were extracted and have undergone waveform separation are then multiplied, and waveform peaks that are formed by the multiplication are detected as being defect portion echoes generated by defect portions in the coarse grained material weld portion; and, as a result, information on the defect portion is obtained from the detected defect portion echo.

Ultrasonic flaw detection method and apparatus

A probe for ultrasonic flaw detectors includes a transducer and either a protection plate to protect the transducer or a metallic part for attaching the transducer directly to the object to be tested for flaws, these two parts being bonded to each other with a heat-resisting brazing or soldering material. Because of its high bonding strength, the probe thus formed is not only capable of serving both in high and low temperature ranges, but also may be used in a roving mode or in a stationary mode in testing the object.

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Yokosuka, Japan

Takahiro Arakawa