the car radiator is an important part of the car engine cooling system. the function of the car radiator is to dissipate the heat absorbed by the coolant in the engine water jacket from the high temperature parts into the air. therefore, the performance of the radiator directly affects the heat dissipation effect of the automobile engine, and thus has a great influence on the power, economy and reliability of the automobile. with the continuous improvement of the engine speed and power, the heat load is getting higher and higher, and the requirements for the cooling system are getting higher and higher. people pay more attention to the research of the cooling system including the radiator, new technology and new materials. keep appearing. automotive radiators are moving in a light, efficient and economical way. automotive radiator materials and manufacturing technologies are growing rapidly. aluminum radiators have a significant advantage in lightweight materials, and they have gradually replaced copper radiators in the field of cars and light vehicles. the technology and technology of copper radiators have been greatly developed, especially the emergence of copper brazing technology. copper brazed radiators have outstanding performance in many aspects, and have obvious advantages in engine radiators such as passenger cars, construction machinery, and heavy trucks.