METHOD OF TWO-CHANNEL ULTRASONIC CONTROL OF WELDED CONNECTIONS WITH TECHNOLOGICAL POOR PENETRATION OF JOINT PARTS Russian patent published in 2008 - IPC G01N29/04 

FIELD: physics.

SUBSTANCE: using direct and inclined ultrasonic converters simultaneous scanning of across welded joint at pitch smaller than ultrasonic beam diameter is used. Echo signal propagation time through first and second channel is recorded. Total sequence of two-dimensional control zone section images are reconstructed on display and applied to form first channel echo signal images of welded joint in the form of colour lines, line of maximum allowed processing poor penetration, as well as image of junction top with poor penetration. Signals of the second channel are applied to form pre-scaled curve with colour code points of which correspond to pulse time position reflected from poor penetration top area. Peak pulse is computer calculated, designated as the other colour. Ultrasonic image of the whole dimension of welded joint is obtained by combining tails of previous V-scans and beginning of the following V-scans.

EFFECT: higher accuracy and reliability of poor penetration dimension evaluation and simplification of evaluating operation of flaw detector.

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