Main Points of Vacuum Brazing of Aluminum Alloy Radiator

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Aluminum alloy radiator is a heat dissipation device made of aluminum alloy as raw material. It is widely used in daily life and production due to its advantages of strong adaptability, light weight, high heat conduction efficiency and compact structure. In the aluminum alloy radiator, the comprehensive benefit of vacuum brazing has obvious advantages compared with the traditional aluminum alloy radiator welding process.

Advantages of vacuum brazing: (1) Strong adaptability, can be used in many materials such as aluminum, aluminum alloy, alloy steel, copper, etc., and can effectively meet the design requirements of aluminum alloy radiators; (2) No pollution, vacuum brazing in It is carried out under vacuum conditions, without the use of flux, and meets the requirements of pollution-free and environmental pollution-free welding treatment; (3) The welding quality is high, the solder has good fluidity, strong wettability, and the workpiece is not oxidized, which is suitable for complex structure and precision requirements. High-level device welding is beneficial to improve product yield.

Aluminum alloy radiator vacuum brazing process requirements:

(1) Ensure the brazing rate and improve the strength of the brazed joint; (2) There is no leakage in the brazing seal; (3) Strictly control the vacuum brazing temperature and holding time to avoid fin corrosion.

Key processes and key points:

(1) Cleaning of parts before welding: The ultrasonic cleaning method, which has the advantages of thorough cleaning, no pollution, automatic control, etc., is used to clean the raw materials before welding, so as to achieve the purpose of effectively removing oxide scale, oil slick, and oil spots.

(2) Determination of vacuum degree: precise control of vacuum degree is an important factor to ensure the quality of vacuum brazing of aluminum alloy radiator. Under normal circumstances, the oxidizing gas in the vacuum furnace is easy to chemically react with the components of the solder to form an Al2O3 oxide film, thereby affecting the welding quality.

(3) Heating method: step heating method.

(4) Cooling speed and furnace release: Too fast or too slow cooling speed will affect the welding quality, and there will be problems of joint cracks or coarsening of base metal grains. It is best to choose cooling with the furnace according to the process.