Automakers are increasingly relying on laser technology for high-strength steel processing. Whether used for welding, cutting or surface treatment, the economic advantages of laser processing are further reflected. High-strength steel is increasingly used in the automotive industry, which further reduces the manufacturing cost of automobiles. The reason is that the use of high-strength steel reduces the number of parts in the assembly process of the automobile, thereby reducing the production cost, reducing the weight of the entire vehicle, and ultimately reducing the fuel consumption of the automobile. Laser Surfacing Applications - Surface Wear Treatment The use of new steels is not always smooth and without any obstacles. In order to obtain high strength or ultra high strength properties, auto parts are usually subjected to pressure hardening during molding. The "CoolTool" project at the Institute of Mold and Molding at the Graz Institute of Technology in Austria is conducting this research. The solution consists of a mold processing system for low-temperature tempering of the pressure hardening process. This system utilizes improved technology to more economically compress harden the boronized alloy steel. The geometry of the cooling channels is as simple as the network inside the mold, optimizing cooling and heating and reducing cycle times. The mold is usually made of ductile iron material, which has low cost and is convenient for secondary processing, but has problems such as low surface strength and poor wear resistance. Therefore, it is necessary to apply a layer of high hardness material to the high load bearing area. Powder surfacing can do this. Laser powder surfacing has proven to be a good way to accomplish this. TRUMPF Laser Systems has also conducted research on this process and has developed a Direct Metal Deposition (DMD). In this process, the metal powder is fed into the laser puddle of the workpiece surface in a direction coaxial with the laser beam without having to preheat the workpiece. The metal powder together with the matrix material forms a high strength wear resistant metallurgical mixture. Compared with the traditional sintering method, laser powder deposition has unparalleled advantages: small heat input, increased hardness and surface crack reduction; limited internal hardness of the coating, good friction coefficient; minimal deformation of the matrix material, residual stress in forming Does not cause cracks. And laser powder deposition can be used for automated production. 3D laser cutting – an irreplaceable approach Trimming is another challenge for high-strength steel. Three-dimensional laser cutting is suitable for the cutting of sheet metal parts, especially for steel plates up to 1500 MPa, because no other processing methods can be substituted. In this case, there is no need for the user to invest in expensive stamping equipment and cutting equipment. Because the processing time of these high-hardness materials can be greatly shortened, the laser cutting does not need to consider these problems, and it has the advantages of short installation time, flexible product replacement or sample production. Trumpser's 3D laser product TruLaserCell has been applied to the cutting of the Volkswagen Side B side, including trimming. The B side is thermoformed from high-strength steel, which is high in hardness and subject to large stresses. The B side wall made of high-strength steel increases the impact resistance and improves the safety of the car. This is also the reason why automakers are willing to use despite the high cost of high-strength steel. Laser welding – efficiency, flexibility, economy Laser can be used for both high-strength steel and welding. Laser welding is more efficient, more economical, and the quality of the weld is greatly improved. However, laser welding requires higher precision and the investment cost of the laser is relatively high