Abstract: Exepriments on the eleetron beam welding of alumina to niobium were carried out to obtain long life ceramic-metal Joints subject to corrosive working medium at high temperatuer.Researehes on the design of welded components and on the technology of perheating and welding were made.Results of the performance tests of the welded joints weer given.The mechanism of this type of EB welding was perliminarily analyzed.