Ultrasonic Brazing of Aluminum Heat Exchanger

With the rapid development of the automotive industry and household appliance refrigeration industry, the production of heat exchangers and evaporators for automobiles and refrigerators is becoming increasingly sophisticated. In order to reduce product costs and weight, one structural type of copper tube aluminum fin is replaced by aluminum tube aluminum fin. This trend is particularly prominent in the manufacturing of light vehicles and fluorine free refrigerators. To meet the mass production of aluminum tube and aluminum fin evaporators and ensure that the products have a beautiful appearance and good quality, ultrasonic aluminum brazing is a good form of mass production for heat exchangers. Ultrasonic brazing of aluminum heat exchangers is a low-temperature brazing technology assisted by ultrasonic waves, targeting the structural and material characteristics of aluminum heat exchangers (such as air conditioners and car radiators). The core is to solve the problem of aluminum surface oxidation and achieve efficient and high-precision welding.

The key points are as follows:

1. Core function: The surface of aluminum is prone to forming a dense oxide film (Al ₂ O3), which is difficult to break by conventional brazing. Ultrasonic vibration can directly shatter the oxide film, while assisting brazing materials (such as aluminum silicon brazing materials) to evenly wet the aluminum substrate, forming a firm joint without damaging the thin-walled structure of the heat exchanger.

2. Technical advantages: Low welding temperature (usually 300-600 ℃, much lower than the melting point of aluminum at 660 ℃), which can avoid deformation of aluminum substrate and coarse grain size; High welding efficiency, suitable for mass production; The joint has good sealing performance and can meet the pressure resistance and leakage prevention requirements of heat exchangers (such as refrigerant circulation systems).

3. Typical applications: Mainly used for welding the core of aluminum heat exchangers such as automotive air conditioning evaporators/condensers, household air conditioning heat exchangers, industrial coolers, etc., especially suitable for connecting thin-walled aluminum tubes and aluminum fins.

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