Method and apparatus for examining weld defects in vertical pipes by supersonic waves

摘要

An ultrasonic defect detection apparatus comprising a supersonic probe, a rotary shaft for revolving the probe along the inner surface of a pipe to be examined, and a hollow shaft removably connected to the rotary shaft for vertically moving the probe. Water acting as a contact medium is circulated between the operating surface of the probe and a water tank through the rotary shaft and the hollow shaft. The apparatus is inserted into a pipe to be examined such as the control rod housing of an atomic reactor through the bottom opening of the pipe, and can be operated from a remote place for the sake of safety.