Pulse laser welding process for improving forming and performance of sheet steel butt weld under assembly error

The invention discloses a pulse laser welding process for improving sheet steel butt weld forming and performance under assembly errors, and belongs to the technical field of sheet welding. Aiming at the problems of poor welding seam forming, incomplete penetration, joint performance loss and the like caused by butt joint gaps and edge dislocation in the welding process of the long and straight thin plates, under the conditions of not additionally adding equipment and not filling wires, a pulse laser welding process is adopted, a pulse waveform is adjusted to be a square wave, and the welding quality of the long and straight thin plates is improved. The low pulse frequency is selected to guarantee effective overlapping between welding spots, the appropriate welding speed and the appropriate laser spot size are matched to guarantee enough laser heat input and molten pool cooling time, the butt welding process of the low-carbon steel sheet with the thickness of 1.8 mm under the assembly conditions that the butt