According to the characteristics of large batches and high degree of automation in the automotive industry, laser welding equipment is developing towards high-power and multi-channel. In terms of technology, Sandia National Laboratory in the United States and Pratt Witney jointly conducted research on the addition of powder metal and metal wires in the laser welding process. The Institute of Applied Beam Technology in Bremen, Germany, conducted extensive research on the use of laser welding for aluminum alloy body frames. It is believed that adding filler metal to the weld seam can help eliminate hot cracks, improve welding speed, and solve tolerance problems, The developed production line has been put into production at the factory.

Laser welding is the use of high-energy laser pulses to locally heat a material in a small area. The energy radiated by the laser is directed through heat transfer to the internal diffusion of the material, melting the material and forming a specific molten pool. It is a new type of welding method mainly aimed at the welding of thin-walled materials and precision parts, which can achieve spot welding, butt welding, overlap welding, sealing welding, etc. It has a high aspect ratio, small weld width, small heat affected zone, small deformation, fast welding speed, smooth and beautiful weld seam, no need for treatment or simple treatment after welding, high weld quality, no pores, precise control, small focus light point, high positioning accuracy, and easy to achieve automation.