Abstract: A device for underwater detection of flaws in welds, especially lap welds as distinguished from butt welds wherein a filleted weld is made, said device embodying ultrasonic transducers arranged to emit and receive a sonic beam at angles such as to pass through the weld at an angle corresponding substantially to the inclination of the weld and to be adjustable for welds of different inclination and for beam travel through different configurations of weldments.

Abstract: A system for non-destructive underwater evaluation of structures comprises an ultrasonic testing means, such as a transducer, means for converting the output thereof into a visual signal, such as an oscilloscope, and means for conveying that visual signal to the underwater technician who is operating the ultrasonic testing means. The means for transmitting the visual signal may comprise an underwater television or other monitor, connected either to a television camera which photographs the output of the oscilloscope or other visual display device, or other means, such as an auxiliary cathode ray tube display device, can be hooked directly to the visual display device. Preferably recording means, such as a video tape recorder, is connected, together with the underwater monitor, to make a permanent record of the monitored signals.