Electron beam welding method of titanium alloy material and CVDNb

The invention discloses an electron beam welding method of a titanium alloy material and CVDNb. The electron beam welding method comprises the following steps: performing oil removal, acid pickling and drying on faces to be welded of a TC4 annular test piece and a CVDNb annular test piece with a graphite matrix; butting the TC4 annular test piece with one face, having the graphite matrix, of the CVDNb annular test piece, and fixing the two abutted test pieces on a fixture; fixing the pieces to be welded by using a three-jaw chuck within a vacuum chamber of an electron-beam welding machine and adjusting the periphery and end faces of a weld joint; preheating one side of the CVDNb annular test piece by means of suppositional focus welding; and welding one side of the TC4 annular test piece by means of substantial focus welding. According to the electron beam welding method, an electron beam is applied to act on a TC4 parent metal and a CVDNb less-melting or not-melting is adopted, and a TC4 liquid metal is brazed with a preheated CVDNb parent metal to realize connection; as a result, such defects as easy splashing, pores, poor formation and the like due to that the electron beam directly acts on loose CVDNb are avoided.