Brazing procedure of aluminium electric-magnetic wires and Guinea gold

Abstract

A method for solder welding aluminum electromagnetic wire and brass comprises aluminum electromagnetic wire and brass connector. The invention comprises that first plating nickel on the surface of brass connector to improve the connecting strength between the solder and the brass connector and the corrosion resistance of aluminum copper connector, while said nickel layer can insulate aluminum atom and copper atom to avoid them to form rigid metal compound layer which will reduce the strength of connector, then using drug Al-Si rigid solder as non-corrosion aluminium fluoride potassium, using flame welding to weld the aluminum electromagnetic wire and the nickel layer of brass connector, the brass connector is treated with neutral oil removing, ultrasonic oil removing, water washing, acid washing, water washing, activating, waster washing, nickel plating, and drying. The inventive aluminum electromagnetic wire and brass connector have same anti-drawing strength, while the resistance of aluminum copper connector is less than the aluminum electromagnetic wire.

Description

Technical field [0001] The invention relates to a brazing method of aluminum magnet wire and brass, in particular to a brazing method of aluminum magnet wire and brass connecting piece of aluminum conductor power transformer coil. Background technique [0002] 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. The supply of raw materials for power transmission and transformation equipment has gradually exceeded demand. However, the price of copper, the main raw material used in the transformer industry, has been Rising, in order to find a better way for enterprises to develop and strengthen their competitiveness, many companies in the transformer industry are actively responding to the unfavorable factors of rising copper prices and developing a supplementary product-transformers with aluminum conductors to meet some market needs. [0003] The co...

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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