1 Overview of Aluminum Alloys and Their Welding
Aluminum alloys are the most widely used type of non-ferrous metal structural materials in the industry and have been widely used in aviation, aerospace, automotive, machinery manufacturing, marine and chemical industries. With the rapid development of the industrial economy, the demand for welded structural parts of aluminum alloys is increasing, and the research on the weldability of aluminum alloys is also intensified. At present, aluminum alloy is the most widely used alloy.
Overview of laser welding technology: Laser welding is a new type of welding technology. The welding heat source is a laser directly, which not only avoids energy waste, but also greatly improves the welding efficiency. At the same time, laser welding uses robots or CNC machine tools as the motion system to reduce the participation of personnel, which can reduce labor waste and improve welding efficiency.
2.2 Application in Automotive Manufacturing
With the rapid development of the times and the ever-increasing speed of people’s living standards, it has become a common practice to go out and ride a car, and people’s requirements for the quality of automobiles are also getting higher and higher. Therefore, the automobile industry is constantly looking for new types of materials and technical means to improve. With regard to the quality of automobiles, laser welding technology has become more and more widely used in the automotive industry. The United States first introduced laser welding aluminum alloy technology into the automotive industry. After a series of experiments, laser-welded aluminum alloys will be manufactured after laser welding of thin aluminum alloys, which will not only greatly reduce the weight of the vehicle body. , And reduce the manufacturing process of cars, improve the production efficiency, has been welcomed and favored by the majority of the automotive industry.
2.3 Applications in Aerospace Industry
As we all know, the aerospace industry requires highly accurate and highly accurate materials to manufacture a series of spacecraft such as aircraft, and the weight requirements for the machines themselves are also very stringent. Using laser-welded aluminum alloys to make aircrafts and other machines can make the fuselage Usually about 20% can be reduced, manufacturing costs have also been greatly reduced. For example, the components of the A350 series aircraft produced by laser-welded aluminum alloy technology at a component production plant managed by Germany have achieved great success.
After more than 15 years of polishing and sedimentation, Shenzhen Sun Laser R&D team has had a good level of welding technology for aluminum alloy products in the area of aluminum alloy laser welding machines. Now we summarize the following difficulties and precautions for welding of aluminum alloy products.
1 The aluminum alloy surface is reflective to the laser
Because aluminum alloy is a kind of non-ferrous metal, it has strong reflection on all kinds of light. As a more intense beam, laser is more likely to cause reflection on the surface of aluminum alloy. In other words, aluminum alloy is a non-ferrous metal. For lasers with high reflectivity and low absorption. In addition, the metal is thermally conductive, so the aluminum alloy also has a strong thermal conductivity. When laser welding is used, the laser is reflected or the heat of the laser is quickly led out, resulting in welding failure of the aluminum alloy. . Therefore, in the laser welding of aluminum alloys, it is necessary to strictly pay attention to and rapidly increase the laser power density to prevent reflection or conduction, and strive to weld the aluminum alloy with extremely high density at an extreme time, so that reflection can be avoided. The emergence of such issues.
2 Make full preparation when laser welding aluminum alloy
Because the aluminum alloy has the characteristics of being lively and easily oxidized, a large amount of dust, moisture, and the like are easily attached to the surface thereof. Therefore, if a sufficient preparation is not performed in the welding process, the surface-attached materials are easily retained by the rapid laser welding. On the surface of the aluminum alloy, thereby affecting the quality of the aluminum alloy and the effect of welding. Therefore, before the aluminum alloy is welded, it is necessary to clean the surface of the aluminum alloy and remove the oil on the surface. At the same time, to prevent explosions and other security threats caused by oxidation during welding, it is also necessary to thoroughly clean the oxide film on the metal surface and completely remove the oxide film.
Contact: Yousheng Fang
Add: Floor 5, Building B, Dingfeng Science and Technology Park, Songgang Tantou 5th Industrial Zone, Baoan District, Shenzhen, China.