The invention discloses a build-up
welding device for an axis part with a
conical surface. The build-up
welding device comprises a base, a tool, a horizontal guide rail, a horizontal sliding table, a swing guide rail, a feed sliding table, a connecting plate and a
welding head, wherein the tool comprises a
machine head, a chuck and a centre seat, wherein the
machine head is arranged on the base, the chuck is arranged on the
machine head, the centre seat is arranged on the base, and the upper end of the centre seat is provided with a centre; the horizontal guide rail is erected above the base through an
elevator mechanism; the horizontal sliding table is arranged on the horizontal guide rail, and is driven by a horizontal driving mechanism; the left end of the swing guide rail is hinged to the right end of the horizontal sliding table, and the right end of the swing guide rail is hinged to one end of a first connecting rod; the other end of the first connecting rod is hinged to one end of a second connecting rod; the other end of the second connecting rod is connected with a swing motor; the feed sliding table is arranged on the swing guide rail; the upper end of the connecting plate is connected with the lower end of the feed sliding table; the welding head is arranged at the lower end of the connecting plate, and is provided with a welding gun and a wire feeding head. The build-up welding device disclosed by the invention can be used for performing mechanical build-up welding on the
conical surface of the axial part with the
conical surface, and is stable in welding quality and high in efficiency.