汽车焊接（Automobile welding）.doc

汽车焊接（Automobile welding） Application and development of laser welding technology in automobile manufacturing The competition of laser technology has strengthened the application of laser welding technology in automobile manufacturing industry. A new laser welding power supply and the higher the laser welding into the field of traditional manufacturing has long been monopolized by the automobile body welding technology, the laser technology has been widely applied in automobile industry. Laser hybrid welding technology can greatly improve the gap connecting ability of stamping parts and make full use of the process stability of arc welding at high speed laser welding. At present, the laser and its composite welding technology has been applied in many industrial sectors, while the car is one of the most important sector, the most typical example is the autobody welding and laser welding of tailored top and side. Several thin plates of different thicknesses, materials and properties are welded by laser and then shaped by stamping. The utility model not only improves the utilization ratio of materials, increases from 40% to 60% to 70% to 80%, but also reduces weight and improves comprehensive mechanical properties. Compared with single laser welding, laser hybrid welding technology has significant advantages: greater penetration, larger gap welding ability and better toughness of the weld, the wire can affect the weld microstructure and weld without sagging phenomenon etc.. Principle of laser welding Laser welding uses laser as welding heat source and robot as moving system. Is the special advantages of laser heat source, it has a heating capacity of extraordinary, the role of a large number of energy is concentrated in a very small, so it has high energy density, concentration, heating speed and welding characteristics of small welding deformation, can realize the fast connection sheet. When the power density of the laser spot is large enough (106, W/, cm2), the metal