FIELD: quality control of butt joints of welds and welded articles. SUBSTANCE: device has a channel similar to the measuring one for detecting the presence of acoustic contact. The situation "presence-absence" of the acoustic contact is indicated by a contrast change of the "red-black" color on the screen of the display unit. EFFECT: higher reliability of control ensured by receiving information on acoustic contact between ultrasonic converter and the article. 1 dwg
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