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A brazing process for high-strength and corrosion-resistant aluminum-copper joints

A brazing process and corrosion-resistant technology, applied in the field of aluminum-copper welding, can solve problems such as poor connection effect of aluminum-copper brazing, price difference in anti-corrosion performance, resource shortage, etc., and achieve good spreadability, increased strength, and enhanced corrosion resistance performance effect

Active Publication Date: 2021-07-02
蚌埠市亿峰金属有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Metal copper has good electrical conductivity, thermal conductivity, good room temperature and low temperature plasticity, and corrosion resistance to the atmosphere and sea water. It is a good material for making electrical switches, electrical equipment, wires and cables, but with the development of industry, The resource shortage of copper is serious, and the price of copper is getting more and more expensive. Therefore, material science and engineering personnel are actively looking for methods such as replacing copper with aluminum. From the perspective of physical properties, aluminum and aluminum alloys also have excellent physical properties and certain properties. Mechanical properties, such as high thermal conductivity, high electrical conductivity, strong corrosion resistance, low density and high specific strength, the price of aluminum is much lower than that of copper, but if you want to get high-quality aluminum-copper connectors, you first need Understand the difficulties and bonding mechanism of aluminum-copper connection; specifically, aluminum-copper connection has broad application prospects in air-conditioning refrigeration, electric power and other industries. At present, the pressure welding commonly used for aluminum-copper connection has problems such as complicated process and high production cost. Pressure welding has obvious advantages, but the current aluminum-copper brazing connection effect is poor. In the prior art, aluminum-copper brazing with high strength and performance can be prepared by adding tin-based silver solder and zinc-tin solder together with aluminum reactive flux. joints, but its corrosion resistance is poor. The corrosion resistance of aluminum-copper joints brazed with zinc-aluminum solder is better, but its strength is low, which limits its application range. Therefore, further research on the aluminum-copper brazing process is needed to expand Application range of aluminum copper connection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] A brazing process for high-strength, corrosion-resistant aluminum-copper joints, using high-frequency brazing, and preparing a titanium diboride coating with a thickness of 0.25 mm on the surface of the copper base metal welding part using a laser cladding process;

[0012] The process parameters are: the composition of the solder is 78.5wt% zinc, 12.6wt% aluminum, 5.7wt% copper, and 3.2wt% palladium; the heating power is 8.5kW, and at the same time, it is irradiated with 37kGy gamma rays to weld The time is 20s, and the gap between the brazing joints is 0.16mm; the induction heating gasket is a 430 stainless iron sheet with a specification of 25mm×25mm×0.3mm;

[0013] During the brazing process, preheated nitrogen gas is introduced to ensure that the concentration of oxygen in the brazing furnace is controlled below 0.002%; after brazing is completed, nitrogen gas is continuously injected to cool it, and the nitrogen temperature is 180±5°C. When the workpiece is cooled ...

Embodiment 2

[0017] A brazing process for high-strength, corrosion-resistant aluminum-copper joints, using high-frequency brazing, and preparing a titanium diboride coating with a thickness of 0.3mm on the surface of the welded part of the copper base material using a laser cladding process;

[0018] The process parameters are: the composition of the solder is 78.5wt% zinc, 12.6wt% aluminum, 5.7wt% copper, and 3.2wt% palladium; the heating power is 10kW, and at the same time, it is irradiated with 50kGy gamma rays. 22s, the brazing seam gap is 0.16mm; the induction heating gasket is a 430 stainless iron sheet with a specification of 25mm×25mm×0.3mm;

[0019] The rest of the content is the same as in Example 1.

Embodiment 3

[0021] A brazing process for high-strength and corrosion-resistant aluminum-copper joints, using high-frequency brazing, and preparing a titanium diboride coating with a thickness of 0.2 mm on the surface of the copper base metal welding part using a laser cladding process;

[0022] The process parameters are: the composition of the solder is 78.5wt% zinc, 12.6wt% aluminum, 5.7wt% copper, and 3.2wt% palladium; the heating power is 8kW, and at the same time, it is irradiated with 25kGy γ-rays, and the welding time 18s, the brazing seam gap is 0.18mm; the induction heating gasket is a 430 stainless iron sheet with a specification of 25mm×25mm×0.3mm;

[0023] The rest of the content is the same as in Example 1.

[0024] A control group 1 is set, and the solder composition is replaced with 83.7wt% zinc content, 9.3wt% aluminum content, and 7wt% copper content, and the rest of the content is the same as in Example 1; a control group 2 is set, and the cladding two The step of titan...

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Abstract

The invention belongs to the technical field of aluminum-copper welding, and in particular relates to a brazing process for high-strength and corrosion-resistant aluminum-copper joints. High-frequency brazing is selected. The welding part of the copper base material adopts a laser cladding process to prepare titanium diboride on its surface. coating; the process parameters are: the heating power is 8-10kW, at the same time with 25-50kGy γ-ray irradiation, the welding time is 18-22s, and the brazing gap is 0.16-0.18mm; The heated nitrogen ensures that the oxygen concentration in the brazing furnace is controlled below 0.002%. Compared with the prior art, the invention has the following advantages: the strength of the brazing joint is increased by cladding titanium diboride coating on the surface of the copper base material, and the corrosion resistance between the copper base material and the brazing filler metal is enhanced; The material composition makes the brazing filler metal have better spreadability on the copper base material and aluminum base material, the interface structure is mainly bamboo-like, the strength of the brazed joint is increased, the corrosion resistance is good, and the application range is wide.

Description

technical field [0001] The invention belongs to the technical field of aluminum-copper welding, and in particular relates to a brazing process for high-strength, corrosion-resistant aluminum-copper joints. Background technique [0002] Metal copper has good electrical conductivity, thermal conductivity, good room temperature and low temperature plasticity, and corrosion resistance to the atmosphere and sea water. It is a good material for making electrical switches, electrical equipment, wires and cables, but with the development of industry, The resource shortage of copper is serious, and the price of copper is getting more and more expensive. Therefore, material science and engineering personnel are actively looking for methods such as replacing copper with aluminum. From the perspective of physical properties, aluminum and aluminum alloys also have excellent physical properties and certain properties. Mechanical properties, such as high thermal conductivity, high electric...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/00B23K1/20
CPCB23K1/00B23K1/20
Inventor 荚爱明丁永贵汪亮亮左洪流
Owner 蚌埠市亿峰金属有限公司