R&D and sales of welding equipment, cutting equipment, robot systems, automated complete equipment and assembly lines; sales of welding materials, welding accessories and auxiliary tools, sales of cutting consumables, cutting equipment accessories and auxiliary tools, sales of labor protection supplies; technical consultation, installation, maintenance and technical services of welding and automation equipment; system services, software services, circuit design and testing services, R&D services, technology transfer services; domestic trade; operating import and export rights business; metal cutting and welding equipment manufacturing; metal cutting and welding equipment sales; special equipment manufacturing