Brazing method of aluminum electromagnetic wire and brass

Abstract

The invention relates to a brazing method of an aluminum electromagnetic wire and brass. The method comprises the following steps: an aluminum electromagnetic wire and a brass connector are included; firstly nickel electroplating treatment or chemical nickel plating treatment is performed on the surface of the brass connector to enhance the connection strength of a solder and a brass connecting piece and the corrosion resistance of a copper aluminum connector; the nickel plating layer can isolate aluminum atoms from copper atoms to prevent the mutual diffusion and to form a compound layer between friable metals, thus reducing the strength of the copper aluminum connector; and then flux-cored Al-Si hard solders are adopted, the solders adopt non-corrosive potassium fluoroaluminate soldering flux, and the nickel plating surfaces of the aluminum electromagnetic wire and the brass connecting piece are partially lapped and brazed through gas brazing. During the braze welding, the mass percents of the main components of the flux-cored Al-Si hard solders are 9.0 to 13.0 percent of Si, less than 4.70 percent of Cu, and less than 0.20 percent of Zn in sequence. In the aluminum electromagnetic wire and the connector of the brass connecting piece which are welded by adopting the method, the tensile strength of the connector is approximately equal to that of the aluminum electromagnetic wire.

Description

[0001] This application is a divisional application with the application number 200710026890.3, the filing date of which is February 7, 2007, and the title of the invention is a brazing method for aluminum magnet wire and brass. technical field [0002] The invention relates to a brazing method for aluminum magnet wires and brass, in particular to a brazing method for aluminum magnet wires and brass connectors of aluminum conductor power transformer coils. Background technique [0003] In recent years, with the continuous development of the installed capacity of the power system, the demand for power transmission and transformation equipment has also increased rapidly, and the supply of raw materials for power transmission and transformation equipment has gradually appeared in short supply. However, the price of copper, the main raw material used in the transformer industry, has remained constant. In order to seek a better way for enterprises to develop and strengthen their c...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is: the diameter of the joint increases a lot, which is not conducive to the winding of the transformer coil; at the same time, the operation is more troublesome

However, domestic manufacturers mostly use friction welding aluminum-copper transition joints to produce aluminum conductor transformers. The disadvantage of this method is that during the welding and connection process of aluminum-copper joints, the joints often become brittle and crack due to high temperature; Copper joints are formed by the diffusion of aluminum and copper atoms at high temperature to form intermetallic brittle compounds, which are continuously thickened; on the other hand, circular friction welding joints are hardened during the process of being pressed into a flat shape, and it is difficult to bend when the coil is wound. Bending forming; due to the use of Zn-Al solder to directly braze aluminum magnet wires and brass nuts, the tensile strength of the joint is low at 26MPa, which cannot meet the requirements of use, and the joint cannot meet the requirements of high strength and high corrosion resistance at the same time , so the existing aluminum-copper friction welding and brazing process needs to be further improved

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