Introduction of Laser Welding

    Laser welding uses high-energy density laser as the heat source to irradiate the material connection, causing the separated materials to absorb laser energy and quickly melt and even vaporize, forming a molten pool together. In the subsequent cooling process, they solidify together and connect together. Laser welding mainly has the characteristics of concentrated and precise heating range, small welding deformation, and fast welding speed.

    The weld metal of laser welding is obtained through rapid solidification, and its grains are finer, which is conducive to improving the strength of the weld metal. Therefore, the strength of laser welding weld metal is slightly higher than that of resistance spot welding weld metal. Therefore, for welding lengths of the same length, the intensity of laser welding is higher than others.

    It can be seen that the welding speed of laser welding is much faster than that of resistance spot welding. For example, in 6 seconds, laser welding can weld a 1m long weld, while resistance spot welding can only weld one point.  Secondly, laser welded joints are continuous, so there is no water leakage problem like resistance spot welding joints, so the process of applying sealant can be omitted. In addition , the deformation of laser welding joints is small, which is beneficial for reducing the segment difference between metal coverings, improving the accuracy of the vehicle body, and also beneficial for the splicing of steel plates with different strengths. Finally, laser welding produces very little spatter, improving the working environment for workers.