Eccentric ball iron pipe nodularity and wall thickness supersonic damage-free detection method
A technology of centrifugal ball and spheroidization rate, which is applied in the direction of using ultrasonic/sonic wave/infrasonic wave, using sound wave/ultrasonic wave/infrasonic wave to analyze solids, measuring devices, etc. Problems such as the difficulty of ultrasonic non-destructive testing of tube wall thickness, etc., to achieve the effect of improving accuracy and reliability, and improving coverage and efficiency
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[0037] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solution and the drawings.
[0038] The position to be inspected on the surface of the inspected centrifugal ductile iron pipe 1 is defined as a plane A-A perpendicular to the central axis of the pipe 1 and intersecting the axis at point O. The intersection line of the plane and the pipe is a concentric ring centered on O. The outer diameter D is the outer diameter of the tube, the inner diameter d is the inner diameter of the tube, S=(D-d) / 2 is the wall thickness of the tube, and the ultrasonic transmitting probe 3 is a line focusing water immersion probe. then
[0039] Focal length in coupling medium
[0040] Focal belt width d -6dB =0.71λf / R c
[0041] Where r is the radius of curvature of the probe focusing lens, C l The speed of longitudinal waves in the focusing lens, Acoustic velocity of longitudinal wave in coupling medium 5, wavelength in λ coupl...
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Abstract
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