Electron beam welding technique for joining two workpieces together

In the method of welding together the adjoining end faces of two thick-walled rotationally symmetrical hollow bodies and which after completion of the welding operation establish closed and inaccessible hollow spaces and wherein the welding is effected by means of an electron beam movable along the outer surface of the bodies at the interface formed by the adjoining end faces and which produce a full-penetration type welded joint from the outer to the inner surfaces, the improvement wherein the end faces of the hollow bodies are provided with adjoining annular fusion lips extending radially inward at their inner surfaces, the side of each said fusion lip facing away from the end face to be welded having a substantially quadrant-shaped profile and the width of said lip at the exit point of the electron beam being at least equal to the diameter of the electron beam thereby resulting in formation of an inner bead therebetween.