With the increasing calls for environmental protection and improving fuel economy, the regulations on reducing consumption and emission reduction in countries around the world are becoming more and more strict. According to the test of international research institutions, if the weight of the vehicle is reduced by 10%, the fuel efficiency can be increased by 6% to 8%;For every 100kg reduction in the curb weight of a car, the fuel consumption per 100 kilometers can be reduced by 0.3 to 0.6 liters, so the lightweight of the car has become the general trend.
Instead of traditional steel cars, the vehicle can reduce the weight by 30-40%; aluminum engines by 30%; aluminum radiator is 20 to 40% lighter than the same copper products; car aluminum body is more than 40% lighter than the original steel products.
Obviously, the use of aluminum instead of steel-made cars, the weight reduction effect is significant.Compared with the traditional body, the all-aluminum body structure is lighter and stronger, convenient for modular design, the body has more space to configure complex technology, and more diversified products.
Seven advanced connectivity technologies
The body in white adopts 7 advanced connection technologies, namely FDS (hot melt self-tapping riveting), RSW (aluminum spot welding), CMT (cold metal transition arc welding), SPR (self-flushing riveting), Adhesive structural glue, Laser (laser welding), Monobolt (high strength core pulling riveting), to ensure the body connection strength and improve the safety of the vehicle.
At present, MIG welding and TIG welding methods are commonly used to weld aluminum alloy materials.Although good welding joints can be obtained by using these two methods, these two methods have the disadvantages of poor penetration ability, large welding deformation and low production efficiency.In recent years, many scientists and technology workers began to explore the new methods of welding aluminum alloy, such as laser welding.
With the continuous development of high-power and high-performance laser processing equipment, aluminum alloy laser welding technology has developed rapidly, and it is one of the main development directions of welding aluminum alloy in the future.At present, aluminum alloy laser welding has been used in the connection of the car body parts, in the Audi A2 (all-aluminum structure), there are 30m laser weld.
Compared with traditional TIG and MIG welding, welding aluminum alloy with laser has the following advantages:
High energy density, low heat input and low welding deformation can yield a narrow melting area and large heat influence area.
Fast cooling speed, can get fine tissue weld seam, so the welding joint performance is good.
Fast welding speed, many functions, high adaptability, high reliability and do not need a vacuum device, so in the welding accuracy, efficiency, automation and other aspects have incomparable advantages.
Laser welding is a kind of high-energy density welding process, welding aluminum alloy can effectively prevent the defects produced by the traditional welding process, and the strength coefficient is greatly improved.
Laser welding helps with the “aluminum” line
Laser welding is also widely used in the manufacturing of transmission gear, half shaft, transmission shaft, transmission shaft, radiator, clutch, engine exhaust pipe, supercharger wheel shaft and chassis and other automotive parts, which has become the standard process of automotive parts manufacturing.It should be seen that some automobile manufacturers in China have adopted laser welding technology in some new models, and from the perspective of laser welding technology itself research, some scientific research institutes in China have made distinctive achievements in some distinctive fields.With the rapid development of China’s automobile industry, laser welding technology will certainly achieve fruitful results and extensive application in the field of automobile manufacturing.
With the prevalence of environmental protection, energy saving and intelligence, laser technology may enter more and more into every link of automobile manufacturing.
Post time: Apr-09-2022