Dissimilar material brazing gap control method and system

Abstract

The invention provides a dissimilar material brazing gap control method and system. The dissimilar material brazing gap control method comprises the steps of: presetting assembly gap values according to the actual structures of all workpieces to be assembled; determining performance parameters of all the workpieces; according to the brazing structures of all the workpieces and the brazing filler metal joint filling requirements, determining the positions of brazing seams and the boundary conditions of thermal structure analysis; according to the boundary conditions of thermal structure analysis and the performance parameters of all the workpieces, analyzing thermal displacement changes of all the workpieces, and working out brazing gap values among all the workpieces; performing comparison and re-calculation according to the brazing gap values among all the workpieces and a preset brazing gap range of a brazing material to obtain an optimal assembly gap range among the workpieces; and performing a process test according to the optimal assembly gap range to determine the actual assembly gap among the workpieces. According to the method, the initial assembly gap of the workpieces and the brazing gap are linked through simulation analysis, so that numerical control over the brazing gap of the dissimilar materials is achieved, and the brazing quality of products is guaranteed.

Description

technical field [0001] The invention relates to the technical field of brazing connection, in particular to a method and system for controlling a brazing gap of dissimilar materials. Background technique [0002] Brazing is to heat the base metal at a temperature lower than the melting point of the base metal and higher than the melting point of the brazing material, and the liquid brazing material wets, spreads, capillary flows and fills the gaps on the surface or gap of the base metal, and finally solidifies and crystallizes , and a material connection method to realize the bonding between atoms. [0003] The reasons for the low strength of the brazing weld are: the chemical reaction between the brazing material and the base metal is relatively weak, and the reaction joint surface is only between a few microns and tens of microns. Therefore, it is necessary to increase the strength of the entire joint by increasing the brazing area, and the brazing area is mainly affected...

AI Technical Summary

Problems solved by technology

[0004]The brazing gap refers to the gap of the workpiece to be brazed when the brazing is melted. At high temperature, it is difficult to measure it by effective means, or the measurement cost is high. Poor implementability of the plan

Therefore, it is necessary to repeatedly preset the assembly gap of the workpiece for brazing. After welding, it is completed by metallographic or other destructive means. This will not only increase the production cycle, but also cause a large production waste. More importantly, it will cause the fuzziness of the control data. Not conducive to the promotion and application of similar products

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