Ultrasonic testing apparatus for pipe or tube end portion and method of setting initial position of probe holder

An ultrasonic testing apparatus for a pipe or tube end portion, comprising:

• an ultrasonic probe which is disposed under the end portion of a pipe or tube laid in the horizontal direction to face the pipe or tube end portion, the ultrasonic probe transmitting ultrasonic waves to the end portion of the pipe or tube and receiving the ultrasonic waves therefrom;
• and
• a probe holder housing the ultrasonic probe which is disposed under the end portion of the pipe or tube to face the pipe or tube end portion and follows the pipe or tube rotating in the circumferential direction,
• the probe holder comprising a coupling medium reserver part which surrounds a space between the ultrasonic probe and the end portion of the pipe or tube to contain a coupling medium therein, and
• the coupling medium reserver part comprising:
• a coupling medium reserver part body into which the coupling medium is supplied;
• an annular bellows part which is attached to the upper side of the coupling medium reserver part body so as to internally communicate with the coupling medium reserver part body, and can expand and contract vertically;
• and
• an annular spacer which is attached to the upper side of the bellows part, and at least the upper surface of the annular spacer is a flat horizontal surface.