ULTRASONIC INSPECTION METHOD OF METAL PRODUCTS DEFECTIVENESS Russian patent published in 2019 - IPC G01N29/04 

FIELD: physics.

SUBSTANCE: use: for flaw detection of complex shaped metal products. Summary of invention consists in the fact that with method for ultrasonic inspection of defectiveness of metal articles involves measurement of a two-dimensional surface profile of an article using an electric probe, selecting three reference points on distinct angles of the control article. Coordinates of said points are recorded and position of control item in space is determined. An optical 3D-scanner is used to project a regular grid of the scanner on a control product, fix it and form a computer form of the control item in form of 3D model of the control product and store it. Roughness of the article is measured using a profilometer. All measured values are recorded. Based on all obtained data, step and trajectory of ultrasonic sensor movement along control article surface are set. As a binder in an ultrasonic transducer, a matching layer and an elastic immersion layer are successively arranged in front of the ultrasonic piezoelectric transducer and selected based on the obtained roughness value. To select material of matching layer its specific acoustic resistance is determined. Thickness of matching layer is determined by formula. Using an ultrasonic sensor, tightly pressing the immersion material to the control article, ultrasonic signals are measured at preset points of the trajectory on the surface of the inspection item through each step of moving the ultrasonic sensor, recording the time of passage of transmitted and reflected ultrasonic signals in the volume of the control article, amplifying these signals and composite A- and C-images are formed, on the basis of which a three-dimensional image of the defect is created and visualized, the defect is determined from the value and position of its position in the control item.

EFFECT: technical result is possibility of ultrasonic inspection of metal products with complex shape.

1 cl, 9 dwg