Method of producing composite steel body shaft.

摘要

A method of producing a composite steel body shaft by using at least one cooling metal mold (29, 31) having a cavity (45) of a diameter and a steel body (30) having another cavity (47) of another diameter both of which cavities (45, 47) are coaxially disposed to define a through-hole in which the remelting and solidifying of electrode (27) is effected to provide a shaft portion (41) connected to the hollow body (30). At a contact position defined by both the metal mold (29, 31) and the hollow steel body (30) at which contact position the diameter of the through-hole is reduced step-wise, a space is provided so that the diameter of the through hole is reduced gradually without the step-wise reduction of diameter of the through hole so as to prevent the confining of slag (39) from occurring at the contact position.