The difficulty of aluminum metal connection
Release time:
2023-01-03
【Summary Description】 The welding of aluminum metal has always been a pain point in the industry. Whether it is traditional flame welding or tunnel furnace welding, there are problems of poor welding effect and leakage welding. Especially in mass welding, the existing welding process is difficult to ensure product consistency and high pass rate. However, due to some physical characteristics of aluminum metal, aluminum metal plays an important role in industrial manufacturing. In the development of modern materials science, we have not found a particularly cost-effective material to replace aluminum metal. Therefore, the welding of aluminum metal is an unavoidable problem in actual production. About why aluminum metal is difficult to weld, there are mainly the following points: aluminum alloy is more difficult to braze than other alloys, the main reasons are: 1, aluminum alloy surface is easy to produce a layer of dense oxide film, the nature of the oxide film is very stable. Covering the surface of the workpiece will hinder the wetting of the solder on the surface of the workpiece, thus affecting the quality of brazing. The melting point of the oxide film on the surface of aluminum alloy is very high, and at the brazing temperature of 500 to 600 degrees Celsius, the thickness of the oxide film will increase to about 20 to 40 times at room temperature, which seriously hinders the wetting and bonding of the solder and the base metal. This is also the reason why it is difficult to reweld aluminum alloy after brazing; 2. When brazing aluminum alloy, because the melting point of the brazing filler metal is not much different from the melting point of the aluminum alloy, the brazing temperature must be strictly controlled, otherwise it is easy to cause the workpiece to burn out; It should be pointed out that the brazing performance of the material cannot be changed, but we can improve the quality of welding by changing the brazing process.
The welding of aluminum metal has always been a pain point in the industry. Whether it is traditional flame welding or tunnel furnace welding, there are problems of poor welding effect and leakage welding. Especially in mass welding, the existing welding process is difficult to ensure product consistency and high pass rate. However, due to some physical characteristics of aluminum metal, aluminum metal plays an important role in industrial manufacturing. In the development of modern materials science, we have not found a particularly cost-effective material to replace aluminum metal. Therefore, the welding of aluminum metal is an unavoidable problem in actual production. About why aluminum metal is difficult to weld, there are mainly the following points: aluminum alloy is more difficult to braze than other alloys, the main reasons are:
1, aluminum alloy surface is easy to produce a layer of dense oxide film, the nature of the oxide film is very stable. Covering the surface of the workpiece will hinder the wetting of the solder on the surface of the workpiece, thus affecting the quality of brazing. The melting point of the oxide film on the surface of aluminum alloy is very high, and at the brazing temperature of 500 to 600 degrees Celsius, the thickness of the oxide film will increase to about 20 to 40 times at room temperature, which seriously hinders the wetting and bonding of the solder and the base metal. This is also the reason why it is difficult to reweld aluminum alloy after brazing;
2. When brazing aluminum alloy, because the melting point of the brazing filler metal is not much different from the melting point of the aluminum alloy, the brazing temperature must be strictly controlled, otherwise it is easy to cause the workpiece to burn out;
It should be pointed out that the brazing performance of the material cannot be changed, but we can improve the quality of welding by changing the brazing process.
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