High-strength steel in the automobile industry has been more widely used, which makes the car to further reduce manufacturing costs. The reason is that the use of high-strength steel assembly reduces the car number of links in the components, thus reducing production costs, reduce the vehicle weight, and ultimately makes car's fuel consumption is reduced. Mold usually made of cast iron material, its low cost, and ease of secondary processing, but there are a low surface strength, abrasion resistance and poor, it is necessary to withstand a high load region covered with a layer of high hardness materials, laser powder surfacing to complete this operation. Facts have proved that laser powder surfacing is a good way to complete this process.
In this process, the metal powder is coaxial with the direction of the laser beam is fed into the molten pool surface, without preheating the workpiece. The metal powder and the base material together to form a high-strength wear-resistant metallurgical mixtures. Compared with conventional sintering method, laser powder deposition has unparalleled advantages: a small amount of heat input, increased hardness and surface cracks decrease; limited distribution within the coating hardness, friction coefficient is good; minimal deformation of the matrix material, the residual stress in the molding does not cause cracks. And laser powder deposition can be used to automate production.
Trimming is a high- strength steels another challenge. Suitable for forming three-dimensional laser cutting of sheet metal cutting, because there is no other alternative processing methods. In this case, the user would not need for expensive trimming equipment for stamping equipment and investment. Because in the processing of these high hardness material, die or traditional equipment will greatly shorten the life of the tool, and laser cutting will not have to consider these issues, but also with short installation time, the flexibility to replace the product or sample production and other advantages. Similar laser cutting, laser welding is one of the advantages of a small amount of heat input. For high strength steels because, in the case of excessive heat input, which will lose some alloy of high strength characteristics. Is also of high quality laser welding process, only a small thermal deformation, the material is hardly warped, and its accuracy is unmatched. In addition, the laser can also be used to weld some unthinkable components, such as cars tailgate and roof connections. Moreover, laser welding as compared with the conventional spot welding, to the flange is smaller, which also reduces the body weight and fuel consumption. To achieve these advantages, continuous weld is necessary. When using this scanning welding technology, the car body structure may become more flexible. Weld joints can shape the strength requirements of different forms. Thus, the size of the welding bead relative resistance spot welding can be further reduced. Therefore, thanks to lighter automotive industry, more economical high-strength components. Moreover, the laser scanner welding work only from the side of the welding, which can make the connector size is reduced, reducing body weight but to ensure strength of the body.
