At present, the main board of automobile radiator heat exchanger in China is mostly made of two-layer or three-layer brazing aluminum sheet metal, which is not strong enough. It will collapse after use for a period of time, poor fatigue resistance and weak heat exchange capacity....

At present, the main board of automobile radiator heat exchanger in China is mostly made of two-layer or three-layer brazing aluminum sheet metal, which is not strong enough. It will collapse after use for a period of time, poor fatigue resistance and weak heat exchange capacity.

The brazing aluminum sheet metal used for the main board of automobile heat exchanger is composed of aa4045 alloy, AA3003 alloy and mod6060 alloy. The above three alloys are produced. The outer layer is aa4045 alloy, the middle two layers are AA3003 alloy and the innermost layer is mod6060 alloy. After the surface is cleaned, it is welded by sub arc welding, hot rolling and cold rolling, According to the cold working rate of 20% ~ 30%, process to the predetermined thickness of 1.5 ~ 2.5mm, recrystallize and anneal at this thickness, the annealing temperature is 405 ℃ ~ 415, hold for 2 ~ 3 hours, and then straighten and shear the finished product after being discharged from the furnace. The functions of each layer of alloy are: aa4045 alloy mainly plays the role of welding, AA3003 alloy plays the role of isolation, and mod6060 alloy plays the role of aging strengthening, strength enhancement and collapse resistance.

Aiming at the shortcomings of the existing brazed aluminum alloy two-layer or three-layer composite plate materials, the brazing aluminum sheet metal produced by our company provides an aluminum alloy multi-layer composite plate material with high strength, fatigue resistance and strong heat exchange ability after brazing and its manufacturing method.