Technology development, transfer, consultation, service, production and sales of intelligent welding controllers, intelligent welding control systems, intelligent welding machine controllers, digital workshop management systems, automated control systems, security monitoring systems, computer software and hardware, welding machines and accessories, automated welding equipment, automated assembly lines, electronic products, communication products (except satellite signal ground receiving and transmitting equipment), network equipment, security equipment, and electromechanical equipment; self-operated and agent import and export business of various commodities and technologies (except for commodities and technologies that are restricted by the state or prohibited from import and export).