Ultrasonic detection scanning imaging device for inside coating interface defect of cylindrical shell and application method thereof

Abstract

The invention discloses an ultrasonic detection scanning imaging device for an inside coating interface defect of a cylindrical shell and an application method thereof. Two step motors are used for driving a cylindrical shell part to be rotated and driving a ultrasonic transducer to be translated, so the complete imaging of the interface adhesion situation of the inside coating is realized. In the scanning process, the vibration is added to the cylindrical shell part by a low frequency pump wave, the purpose of the added vibration is to open and close tiny cracks of the coating interface continuously, and the nonlinear effect is generated; in addition, the high frequency ultrasonic transducer continuously transmits / receives an ultrasonic signal, the received ultrasonic wave generates the nonlinear ultrasonic phenomenon under the effect of the low frequency pump wave, and the shape and position of the tiny defect of the coating interface are detected by extracting the nonlinear ultrasonic characteristic parameters. The device has the advantages of rapid detection speed, accurate test data, simple device operation and strong practicability, and has the extensive application prospect.

Description

technical field [0001] The invention belongs to the field of non-destructive testing, and relates to an ultrasonic detection scanning imaging device and an application method thereof for coating interface defects on the inner wall of a cylindrical shell. Background technique [0002] Inner wall coatings are widely used in important components of cylindrical shells, such as the "four tubes" of power plant boilers, the inner wall of automobile engine cylinders, and the thermal insulation layer (thermal barrier coating) at the hot end of aero-engines. Because these key components are operated under high temperature, wear, erosion, thermal shock and other working conditions for a long time, it often leads to coating peeling, serious wear, oxidation corrosion and other phenomena. Premature component failures bring safety hazards, causing huge personal injuries and economic losses. Therefore, mastering the quality of the inner wall coating interface is particularly important for ...

AI Technical Summary

Problems solved by technology

Among them, ultrasonic non-destructive testing is one of the methods widely used in the detection and evaluation of coating quality, but it is limited to the testing of physical properties of coatings, and the detection of interface defects is still in the qualitative research stage, and it is a local coating Characterization of characteristics in the range, not able to scan comprehensively

In addition, it is also restricted by conditions such as thin coating thickness of the inner hole, small interface defects, and circumferential curvature, which brings difficulties such as cumbersome detection process and low defect detection rate to ultrasonic testing.

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