The heat transfer coefficient is an important parameter for evaluating the heat dissipation performance of the radiator. The thermal conductivity and welding quality of automotive radiator materials have a great impact on it. The working conditions of automobile radiators are harsh, and they are generally located in the windward direction of the front end of the car. In addition, there is a long-term flow of coolant in the car radiator, which has rust and corrosion effects on the car radiator. Therefore, in order to ensure that the heat sink can play the heat dissipation function reliably, its material properties have the following requirements: it needs to have good thermal conductivity, have certain strength and strong corrosion resistance, have good processability and brazing performance, and have Good economy. At present, commonly used radiator materials are mainly copper, aluminum and engineering plastics. Selecting a material with a high thermal conductivity for the heat sink is also very helpful to improve the thermal conductivity. In terms of metal thermal conductivity, silver has a higher thermal conductivity, followed by copper and aluminum. Silver is expensive and is not suitable for heat dissipation. At present, copper, aluminum and aluminum alloy are more commonly used. Aluminum has a low thermal conductivity, but by increasing the fins to increase the heat dissipation area, it can also achieve a good heat dissipation effect.