THE LONG LIFE LaB_6 CATHODE OF THE ELECTRON UN FOR ELECTRON BEAM WELDING

In this paper the development study of the long life cathode of the electrongun for electron beam welding is presented.The problems that need to car(?)during the selection of the cathode material and definition of the structure ofthe cathode unit are studied.Through the principle test and the practicalapplication in the electron beam welding gun,the heating characteristics anpthe emissive characteristics of the LaB_6 cathode are measured.The probremsencountered in applying LaB_6 cathode to the electron beam welding are solvedpreliminarily.The life of the cathode is estimated to be 1000hrs.