Ultrasonic testing method and system for brazing quality of composite materials and metal heat pipes

Abstract

An ultrasonic testing method and system for the brazing quality of composite materials and metal heat pipes. First, the corresponding relationship between the voltage value and the gray value is established, and the welding threshold is set according to the gray value; The side is incident perpendicular to the direction of the inner wall, and the sound wave is reflected after reaching the welding interface to form an interface reflection echo; finally, the peak value of the DC voltage of the interface reflection echo signal is sampled, and the corresponding relationship between the voltage value and the gray value is marked out The corresponding gray value of the detected area, the area higher than the threshold is the defect area, and the area less than or equal to the threshold is the welding area. The present invention also includes an ultrasonic detection system, including an ultrasonic flaw detector, a computer, a signal acquisition unit, a probe, a waveguide and an acoustic mirror; The acquisition unit collects and transmits to the computer, and the computer associates the voltage with the gray value to judge the welding quality.

Description

technical field [0001] The invention relates to an ultrasonic detection method and system for the brazing quality of composite materials and metal heat pipes, in particular to an ultrasonic detection method and system for the brazing quality of ceramic matrix composite materials and small-diameter metal heat pipes, belonging to the field of ultrasonic nondestructive testing . Background technique [0002] The brazing structure of ceramic matrix composite material and small-diameter metal heat pipe is a new type of heat-proof structure. The inner diameter of the metal alloy heat pipe can be as small as Φ5mm and the wall thickness is 0.37mm. The quality of the brazing joint in this structure directly affects the heat transfer effect of the interface and the heat resistance performance of the product. Therefore, reasonable and effective non-destructive testing techniques must be used to detect its brazing quality. [0003] At present, metal-to-metal brazing materials are relat...

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is: the present invention solves a series of problems such as poor sound beam directivity, poor resolution, and poor coupling caused by thin metal pipe walls and large curvatures during ultrasonic testing, and realizes ceramic matrix composite materials. Ultrasonic nondestructive testing of brazing quality with small diameter superalloy heat pipes

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