Pulse infrared heat wave detection method for metal honeycomb brazing parts

Abstract

The invention discloses a pulse infrared thermal wave detection method for a metal honeycomb brazed part. The method is characterized by comprising the following steps: detecting the metal honeycomb brazed part through a pulse infrared thermal wave technology, and performing further treatment through a thermograph corresponding to a moment when a thermal contrast maximum peak appears; performing histogram and balance processing on the thermograph, and calculating a threshold value according to the structural characteristics of honeycomb core grids and simplified three-dimensional thermal diffusion; calculating all extreme points on curves along the horizontal direction and the vertical direction of the thermograph, wherein the positions of all the extreme points are assigned with a value 1 representing brazing regions, and the extreme points on which differential values between minimum peak values and adjacent extreme peak values are smaller than the threshold value are assigned with a value 0 representing non-brazing regions. By adopting the method disclosed by the invention, defect recognition results can be obtained more visually, accurately and conveniently, and automation of all steps can be realized in certain embodiments.

Description

technical field [0001] The invention relates to the technical field of non-destructive flaw detection, in particular to a pulse infrared thermal wave detection method for metal honeycomb brazing parts. Background technique [0002] Metal honeycomb vacuum brazing parts are brazed by metal honeycomb and single-sided bearing plate (superalloy skin), and have been widely used in aerospace, transportation, military industry, electronics and other fields. Brazing is the joining of heated solid metals using molten filler metal (solder) at a certain temperature and pressure in a vacuum environment. The solid metal does not melt during the brazing process, and its combination is formed by atomic diffusion between the metal to be welded and the solder. [0003] Since the metal honeycomb vacuum brazing parts are vacuum brazed on one side of the metal honeycomb and the bearing plate, the brazing quality directly affects its performance. Due to technical reasons, the metal honeycomb va...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a pulse infrared thermal wave detection method for metal honeycomb brazing parts. Aiming at the defect characteristics of metal honeycomb brazing parts, on the basis of pulse infrared heat wave theory, the brazing defect signal interpretation is carried out, thereby overcoming the existing pulse The infrared thermal wave detection method is easily affected by noise, and it is difficult for manual interpretation to be effective.

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