FIELD: machine building.
SUBSTANCE: ultrasonic surface waves are transmitted from inner surface of one male element and one female element to inner surface of another male element and another female element through shoulders of male element and female element, and based on the intensity of transmitted waves or intensity of reflected waves, it is determined, whether the securing state of threaded connection is satisfactory or not.
EFFECT: providing the possibility of easy and accurate evaluation of securing state of shoulders of threaded connection of pipe or tubes.
4 cl, 18 dwg
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