Ultrasonic detection system and detection method for thick-wall pipes

Abstract

The invention belongs to the technical field of ultrasonic detection, and discloses an ultrasonic detection system for thick-wall pipes. The system comprises a transverse wave reference block, a transverse wave detection probe, a longitudinal wave reference block and a longitudinal wave detection probe; U-shaped grooves are formed in the inner wall and the outer wall of the transverse wave reference block; a round hole is formed in one end of the longitudinal wave reference block; and a double-crystal probe is adopted as the longitudinal wave detection probe; and the transverse wave detection probe is a transverse wave probe with a curvature wedge block, and the curvature radius of the curvature wedge block is matched with the radius of a pipe to be detected. The invention further discloses a detection method; and longitudinal wave flaw detection is added on the basis of transverse waves, so that the detection sensitivity and resolution of the thick-wall pipe are improved. According to the detection method that the pipe is in direct contact with the probe, because no water layer attenuation exists between the probe and the pipe, scattering and absorption of sound waves in water can be effectively reduced, the sensitivity of pipe detection is improved, and the method is particularly suitable for high-sensitivity detection of large-specification pipes.

Description

technical field [0001] The invention relates to the technical field of ultrasonic detection, in particular to an ultrasonic detection system and detection method for thick-walled pipes. Background technique [0002] An aero-engine air duct has no large-scale pipe (maximum diameter Ф175mm) manufacturing supplier in the early stage, and the raw material is supplied in the form of forging. In recent years, domestic manufacturers have been able to produce large-scale pipes. In order to reduce raw material consumption and production costs, the raw material of an air duct for an aero-engine has been changed from rods to thick-walled TC11 titanium alloy pipes for direct processing. The processing process of thick-walled pipes Different from the rod forming mechanism, stretching and calendering cause radial and axial stress in the material, and the orientation of defects is more complicated than that of rods. Generally, the wall thickness of the pipe is thin, and the ultrasonic tes...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an ultrasonic detection system and detection method for thick-walled pipes, which solves the problem that the existing ultrasonic detection methods cannot be applied to thick-walled pipes.

Images