Method and system for ultrasonic detection of composite material and metal heat tube braze welding quality

Abstract

The invention discloses a method and a system for ultrasonic detection of composite material and metal heat tube braze welding quality. Firstly, a corresponding relation between a voltage value and a gray value is established, and a welding threshold value is set according to the gray value; acoustic waves are shot from one side of an inner wall of a to-be-detected metal tube in the direction perpendicular to the inner wall, the acoustic waves are reflected after reaching a weld interface, and interface reflection echoes are formed; finally, direct current voltage of interface reflection echo signals is subjected to peak sampling, the corresponding gray value of a detected area is marked according to the corresponding relation between the voltage value and the gray value, the area with the gray value higher than the threshold value is a defect area, and the area with the gray value smaller than or equal to the threshold value is a welding area. The invention further discloses an ultrasonic detection system which comprises an ultrasonic flaw detector, a computer, a signal acquisition unit, a probe, a waveguide tube and a reflecting mirror; the probe irradiates the to-be-detected metal tube through the waveguide tube and the reflecting mirror, signals of the probe are acquired by the signal acquisition unit after returning along the original path and transmitted to the computer, the computer associates voltage with the gray value, and the welding quality is judged.

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

Images