Search unit assembly for nondestructive testing of pipes and rods by the ultrasonic method

The search units applied in immersion technique are placed in a plane that is vertical with respect to the pipe axis. Two search units each with their crystals are combined to a rigid assembly in such a way that the emitted sound beams will meet a point on the pipe surface at the same angle with respect to a vertical line (angle bisector). The search unit system can be moved along this angle bisector. Adjustment of the search unit system to different diameters of the pipes and rods is easily achieved. There is provided for a pulse-beat control for operational monitoring. (DG)