High-quality aluminum welding is one of the key technologies in the future automobile production. The reliability of aluminum welding is better than that of arc welding. We believe that the first choice is to choose aluminum alloy, and more importantly, use high-quality brazed aluminum sheet
, vacuum. Brazing.
Aluminum alloy has the advantages of light weight, high strength and corrosion resistance. Aluminum alloy has become an important material in automobile manufacturing. High-quality aluminum welding is one of the key technologies in the future automobile production. The reliability of aluminum welding is better than arc. Welding, compared to other welding methods, brazing has at least two unique advantages, easy to complete high precision, thin wall, complex parts connection: high production efficiency, in the shell, pipe structure (automobile heat exchanger, oil Brazing, hydraulic pipes, etc.), brazing aluminum sheet
has been widely used. Brazing in vacuum welding and NOCOLOK flux furnaces is currently an advanced process that is highly respected, and these two methods are in line with the manufacturing philosophy of just-in-time production, sophisticated production and green manufacturing.
Brazing properties of aluminum alloy
Compared with other alloys, aluminum has poor brazability, and its main reasons are:
Aluminium has a high affinity with oxygen. At room temperature, aluminum in the air can form an Al2O3 film with oxygen quickly. At a brazing temperature of 750-880 K, the thickness of the oxide film can reach 100 nm or more, and the Al2O3 film is dense and stable. And the melting point is very high (2300K). Since the Al2O3 film is difficult to remove, the brazing material needs to greatly hinder the wetting of the masterbatch by the brazing material. In general, it is necessary to perform brazing by using a flux of several thousand.