Copper-aluminum pipe and its welding process

Abstract

The invention relates to a copper-aluminum pipe and its welding process. What the present invention adopts is a kind of brazing method that uses solder as an intermediate medium through a brazing process. In fact, a metallurgical reaction occurs, and the solder penetrates into the molecular structure of copper and aluminum through capillary action. The welding method Not only is it well formed, but it also has good tensile and shear resistance, electrical conductivity and corrosion resistance, and is suitable for welding large-scale pipelines of vehicle air conditioners.

Description

technical field [0001] The invention relates to the jointing of copper and aluminum pipes in the automotive industry, which is a kind of heterosexual welding that integrates copper materials and aluminum materials through a welding process, and is applied to automobile air-conditioning pipeline parts. Background technique [0002] The technical difficulty of copper-aluminum welding is that there is a large difference in heating and melting points between dissimilar materials, which is prone to welding hot melt (mainly refers to aluminum weldments), and copper-aluminum pipes, because they are wrapped by pipe fittings, have poor heat dissipation, and aluminum parts are easier to weld. Melting occurs, resulting in processing failure. [0003] At present, the copper-aluminum welding used for forming in the market is mainly the welding of electrical circuits and sheets or plate-like structures on the heat exchange core. This welding method is costly and difficult for large-scale ...

AI Technical Summary

Problems solved by technology

[0005] 1. Traditionally, the method of hanging tin and melting tin is commonly used to weld copper and aluminum, but this method is not well formed and has no good strength. Because the melting point of tin is low and it cannot be welded to workpieces under high temperature work, this process is only suitable for Used on small workpieces under low temperature conditions (only suitable for welding multi-strand copper wires and small-sized aluminum enameled wires), it is difficult to apply to large-scale products of automotive air-conditioning pipelines

[0006] 2. Copper and aluminum are welded by fusion welding, friction welding, cold pressure welding, explosive welding, electron beam welding, ultrasonic welding and other welding methods, but the welded joints are brittle and prone to cracks and pores in the welded seams. It is inevitable that the workpiece will be broken. After the breakage, it may be that the conductor is broken or the pipeline is leaking. Therefore, the effect required in actual production is often not achieved.

[0007] Therefore, after the above description, the traditional welding methods are not suitable for copper-aluminum pipe welding

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