Counterweight rear cover plate laser positioning welding device

The invention belongs to the technical field of welding, and discloses a counterweight rear cover plate laser positioning welding device which comprises a fixing frame, a protection assembly is fixedly installed on the inner side of the fixing frame, and a laser welding head is fixedly installed in the middle of the interior of the protection assembly. The purpose of welding seam cleaning is achieved by arranging a first electromagnet, a cleaning brush, a first magnet and the like, an exhaust fan is started to exhaust air from the interior of a protective cover, the bottom of the protective cover is sealed through a second air bag, meanwhile, the first magnet is always in contact with the surface of a counterweight rear cover plate of the excavator, and the welding seam cleaning effect is improved. First balls roll and move along the surface of the excavator counterweight rear cover plate, iron impurities in a welding seam of the excavator counterweight rear cover plate are adsorbed under the suction force of