Coated steel plate lap welding equipment and method

The coated steel plate lap welding equipment comprises an upper welding wheel walking mechanism and a lower welding wheel walking mechanism which are arranged on the upper side and the lower side of a walking route of a steel plate to be welded respectively, and is characterized in that laser scanning devices are installed on the upper welding wheel walking mechanism and the lower welding wheel walking mechanism; the laser scanning device comprises a shell, a laser device, a polygonal reflector and a focus lens, the laser device, the polygonal reflector and the focus lens are arranged in the shell, laser beams emitted by the laser device reach the focus lens through the polygonal reflector to form focused beams, and the focused beams irradiate the surface of the steel plate from a light outlet of the shell. The method can quickly remove the surface coating of the to-be-welded part of the steel plate before welding, so that the welding quality is improved. 本发明公开了一种镀层钢板搭接焊接装备及方法，包括分别布置于待焊接钢板行走路线的上侧和下侧的上焊接轮行走机构和