Welding Technology of New Energy Vehicle

With the introduction and promotion of the green development concept in the new era, many facilities that cater to the concept of green environmental protection have emerged as the times require. New energy vehicles have broken the environmental pollution and energy waste caused by traditional automobile fuel. This paper will discuss the current development status of new energy vehicles, the new welding technology and the application of new energy vehicles. I hope that this research will lay the foundation for the production and application of new energy vehicles in real life in the future.

The use of traditional petroleum in automobiles not only brings about serious shortage of energy due to energy consumption, but also has a negative impact on the deterioration of the world environment and greenhouse gas emissions. Nowadays, many pollutants in the air in the world come from automobile exhaust, such as carbon monoxide, 80% from automobile exhaust, 40% of nitrogen oxides, and 20% to 30% of urban particulate pollutants come from automobile exhaust. Environmental problems, in turn, pose a serious threat to people's lives and health, and have also attracted the attention of the state. In recent years, new energy related technologies have gradually developed and matured. Electric vehicles and automobiles based on new energy have also been listed one after another, which bring significant environmental benefits. Under the background of paying more attention to environmental issues in the future, new energy vehicles will also become the future development trend.

At present, although the technology of electric vehicles has gradually matured, there are still some problems, such as manufacturing costs, driving mileage and so on, which are still different from the traditional fuel vehicles. According to the differences of battery itself, there are some problems in volume, weight, power, cost and charging time, which have become the bottleneck of further development of electric vehicles in the current society. These problems can be summed up as follows: the driving mileage is very limited; the service life of batteries is relatively short; the cost of batteries is relatively high, and the problems of charging points and charging time can not be effectively solved in a short time.

At present, laser welding is widely used in new energy vehicles. This new welding technology has also been successfully applied in powder metallurgy, biomedicine, electronic packaging, automotive industry, aerospace and other fields. For new energy vehicles, one of their core components is the motor. In the process of manufacturing new energy vehicles, the requirements for motors are also very high. Especially in the welding process of specimens need higher strength, higher precision and less heat impact, but in the welding process, the welding operation space angle is very limited and will be idle. Compared with traditional welding methods, laser welding has significant advantages in the application of new energy vehicles, and will become an inevitable trend in the future.

The application of laser welding technology requires a high energy density laser beam as a heat source, which is a welding method with high precision and high welding efficiency. Compared with traditional welding techniques, the advantages of laser welding technology in new energy vehicles are mainly as follows:

First, the ability to minimize the amount of heat input will also reduce the extent of the heat affected zone, resulting in a minimized incidence of adverse effects due to heat transfer. Second, there is no need to use electrodes in the application of laser welding technology, so there is no need to consider the damage of the electrodes themselves or the pollution problems. Because the welding of the mechanism is different from the general contact welding method, it can also reduce the loss and deformation of the machine. Third, the laser beam has advantages in focusing and aligning, and is guided by chemical instruments. It is only necessary to place it at a proper distance from the workpiece during the specific welding process. At the same time, in the process of guiding, it only needs to be carried out between the obstacles or between the implements around the workpiece, and the space limitation is also smaller.

In a relatively closed space, that is, an internal gas environment or a vacuum environment, the laser beam can be concentrated in a small range, so that welding of a small range of components can be achieved. Laser welding can be used to weld a wide variety of materials and even to weld different types of heterogeneous materials. In the process of laser welding, it is easy to become high-speed welding, which can realize computer or digital control. If some thin-diameter material is welded, it will not be affected by the remelting when using arc welding, nor will it be affected by the magnetic field, and it can be more accurately aligned during the welding process. component. It can realize the welding of two materials with different physical properties, such as two kinds of metal materials with different resistances.

X-rays are not required for protection during actual soldering, and vacuum environments are not required. Eighth, if the perforation welding method is used in the laser welding process, the ratio of the depth to the width of the weld bead can exceed 12:1. The laser beam can be simultaneously transmitted to different workstations by implementing a conversion to the device. The use of laser welding in the manufacturing process of new energy vehicles can significantly improve their social and economic benefits, and at the same time improve the quality of the welded joints, significantly improve their stability, and reduce accidents caused by joint problems. The loss of accidents will also reduce costs from another level. In addition, the application of laser welding technology in the manufacture of new energy vehicles will also solve the environmental pollution problems existing in traditional welding technology, electromagnetic radiation and other issues, and the social benefits are significant.

In the specific welding process, different and diversified processing technologies such as cementation, welding, fastener, riveting and so on need to be used. Among the above several processing technologies, welding process belongs to a relatively lower cost and higher quality way. Welding parts need silicon steel sheet as the raw material of stator core, after shearing, punching and other related processing lag, no lamination, and then according to a certain distance on the stator outer wall welding seam, so that the silicon steel sheet surface can be welded together to form a new whole. In the process of welding the stator of motor, the technology used also develops from electrode arc welding, carbon dioxide gas shielded welding to laser welding. From the point of view of welding technicality, laser welding is more ideal, because the initial two welding methods have short plates in large spatter and poor forming. Hot-rolled or cold-rolled silicon steel sheets are usually selected as the materials for motor stator lamination, and the welding properties are very good. If the laser welding method is used, it will not only help to improve productivity, but also improve the safety conditions of production environment and reduce the harmful effects of harmful oxides on human body. In addition, with the help of computer to control the output of laser beam, the stator can meet the requirements of welding seam. It can be completed by one or two welding, and the time saved will greatly reduce the deformation.

The emergence and application of new energy vehicles conform to the current concept of green development. But its production and promotion are also limited by many factors. Welding technology is an important link in the manufacture of new energy automotive motor. The selection and application of welding technology will have an impact on the final welding effect. This paper mainly expounds the advantages of laser welding technology, such as meeting the needs of welding different materials, with the help of the advantages of laser itself, so that it can achieve 360 degree range of no dead angle welding, which is impossible to achieve under the application of traditional welding technology. At the same time, the specific application of laser welding technology in new energy vehicles is analyzed, pointing out that it will bring better social and economic benefits. In the future, welding technology will also achieve new development and renewal in the application of new energy vehicles, providing guarantee for the quality of new energy vehicles.