Welding method and welding system based on blue laser

The invention belongs to the technical field of laser welding, and relates to a welding method and system based on blue laser, and the welding method comprises the following steps: preparing a target metal film with N hollow patterns; two to-be-welded metal pieces with a welding seam formed between the two metal pieces are installed on a welding platform, a target metal film is arranged, and the target metal film is located above the to-be-welded metal pieces; starting the blue light laser, adjusting the output energy of the blue light laser according to a target demand, and aligning a blue light laser beam emitted by the blue light laser to one of the hollowed-out patterns to serve as a target hollowed-out pattern; and the target hollowed-out pattern is heated through a blue light laser beam, so that the metal at the position corresponding to the target hollowed-out pattern is molten into molten drops until the molten drops are separated from the target metal film and drop to the weld joint, and finally the