In order to improve the digital level of the welding production process,a welding database and expert system integrating welding database platform,process designing expert system platform and welding information management platform have been developed. The database platform is used to store and manage the welding data including welding basic data,welding test data,mature welding process data and welding quality diagnosis case data. The expert system of process design has realized the manual design and printing of manual TIG welding,automatic TIG welding,resistance welding and vacuum electron beam welding process files based on knowledge database and inference engine. Welding information management platform has realized online management and control of welding process based on database platform,expert system platform and user rights management. It is proved that the system can realize the purpose of collaborative intelligent office in LAN.