FIELD: measurement technology, nondestructive materials testing. SUBSTANCE: piezoelectric transducers 1 and 2 are set on each side of joint 6 to be welded. In soldering piezoelectric transducers 1 and 2 are alternately turned on and off, in overlap mode, and measurements are taken of amplitudes of echo signals reflected from the edge of welded joint 6. Piezoelectric transducers 1 and 2 are then switched to shadow mode so as to measure an amplitude of a signal which passes through the joint 6. The amplitudes measured are used to determine the quality of the welded joint. EFFECT: increased inspection reliability due to taking account of changes in sensitivity by reason of joint heating and individual features of parts to be joined. 4 dwg
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