Mitsubishi Denki Kabushiki Kaisha

Nobuaki Yakoh

Mitsuhiro Koike

A method of reliably detecting flaws in a thick wall steel pipe with an ultrasonic beam in which flaws of the internal surface of the pipe are detected using a shear wave mode. The transmitting probe is disposed slantingly relative to both the longitudinal and transverse directions of the pipe so that the shear wave emitted therefrom is incident onto the pipe at a refraction angle of 35 to 70 degrees, whereby the beam inside the walls of the pipe is made to impinge on surface flaws of the inner surface of the pipe at an angle in the same range.

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Kanagawa, Japan

Nobuaki Yakoh