As a core connection technology in the field of high-end manufacturing, laser welding relies on the core advantages of high energy density, high precision, low deformation and high efficiency to break the limitations of traditional welding processes and realize the precise connection of various metal materials. Based on the in-depth integration of laser technology, intelligent control and materials science, we have summarized and refined nine core application processes, covering the whole scenario from basic connection to precision welding, from mass production to customized processing, comprehensively solving the pain points of traditional welding such as low efficiency, poor weld quality and large deformation, empowering multiple industries such as aerospace, automobile manufacturing, electronic manufacturing and high-end equipment to achieve technological upgrading, and highlighting the core technical barriers and industrial application value of laser welding.