Copper-aluminum connecting piece face-face penetrating fusion welding technique and preparation method

Abstract

The invention discloses a copper-aluminum connecting piece face-face penetrating fusion welding technique and a preparation method. The problems that in the prior art, firm joint surfaces of copper-aluminum joint surfaces cannot be continuously generated, or base material crystal grains become thick and big, so that the physical property, the mechanical property and the electrical and chemical index of base materials and the joint surfaces are influenced are solved. The copper-aluminum connecting piece face-face penetrating fusion welding technology is characterized in that the main microstructures of the copper-aluminum connecting piece joint surfaces are dissolved solid matter organizations generated in the physical preparing process in a connecting mode; after the base materials are preheated, energy is supplied through low-temperature friction and extra-high voltage, so that atoms or molecules of solid phase aluminum materials and solid phase copper materials deviate from the equilibrium position to conduct long-distance migration, and a solid phase connecting face with physical connecting characteristics is formed; the total quantity of the dissolved solid matter in the joint surfaces is more than 95%, or the total quantity of compounds, oxides and mixtures in the firm joint surfaces is equal to or less than 5%, so that the mechanical properties of original base materials are basically retained, and the original base materials have the characteristic that the physical properties are higher than the physical properties of parent materials of the base materials; and density and mechanical strength are higher than those of base materials.

Description

technical field [0001] The invention relates to the technical field of copper-aluminum connection, in particular to a surface-to-surface infiltration welding process and a preparation method of a copper-aluminum connection piece. Background technique [0002] Copper-aluminum welding is to join the copper material and the aluminum material into one body through the welding process. Because both copper and aluminum are easy-to-oxidize metals, the welding of copper and aluminum has always been an international welding problem. The existing welding methods are traditionally used to weld copper and aluminum by hanging tin and melting tin. This method is not ideal for forming and does not have high strength. Due to the low melting point of tin, it cannot be welded to workpieces under high temperature work, so This process is only suitable for use on small workpieces under low temperature conditions. There are fusion welding, friction welding, cold pressure welding, explosive wel...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the following problems in the prior art: the copper-aluminum joint surface cannot form a continuous solid joint surface, or due to the limitation of the processing principle, in order to form a liquid-phase molten amorphous structure, the base material is subjected to high-temperatur

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