Welding method for improving flatness of laminated iron core

The invention discloses a welding method for improving the flatness of a laminated iron core, and belongs to the field of motors, the laminated iron core after being stacked is pressed, pressure is applied to the laminated iron core by at least one pressing surface during pressing so as to reduce gaps among a plurality of laminations, and when at least one pressing surface is located at the upper end of the laminated iron core, the laminated iron core is pressed by the at least one pressing surface so as to reduce the flatness of the laminated iron core. The horizontal height of the abutting surface close to the center of the lamination is lower than the horizontal height of the abutting surface close to the edge of the lamination, and the abutting surface is in an inverted cone shape; when at least one pressing surface is located at the lower end of the laminated iron core, the horizontal height of the pressing surface close to the center of the laminated sheet is higher than the horizontal height of the pre