Cylindrical alignment sample for adjusting the sensitivity of profiled piezoelectric transducers during ultrasonic testing of cylindrical parts with a diameter of up to 300 mm

摘要

The utility model relates to devices for non-destructive testing of the structure and defects of metal products and can be used in the manufacture of cylindrical tuning specimens for adjusting the conditional sensitivity of acoustic ultrasonic flaw detectors with profiled piezoelectric transducers during ultrasonic testing of cylindrical parts (rods, castings, forgings of cylindrical parts) up to 300 mm in diameter .Cylindrical alignment sample contains 4 reference horizontal through chord cylindrical lateral artificial reflectors with a diameter of (2.5 ... 3.5) mm, designed to adjust the conditional sensitivity in the transverse scanning direction (along the generatrix of the cylinder), located in the rear part of the alignment sample perpendicular to the longitudinal axis symmetry of the cylindrical surface of the specimen with a step (0.03 ... 0.2) D along the length of the specimen, with a step D / 4 along the height of the specimen and displaced relative to the upper and lower edges of the specimen by D / 8; and 4 standard horizontal blind end cylindrical lateral artificial reflectors with a diameter of (2.5 ... 3.5) mm and a length of (0.2 ... 1.2) D, designed to adjust the conditional sensitivity in the longitudinal scanning direction (along the circumference of the cylinder), located in the front end of the alignment sample in the vertical plane of sample symmetry with a step in the height of the sample D / 4 and offset relative to the upper and lower edges of the sample by D / 8. The diameter of the cylindrical lateral artificial reflectors, equal to (2.5 ... 3.5) mm, corresponds to the minimum possible acoustic signal from the cylindrical lateral artificial reflectors for its recognition above the intrinsic noise level for the thickness range of the tested metal up to 300 mm, and the equivalent area of such an artificial reflector equal to 6.5 mm2.