Abstract: A welding mechanism for build up of a conical surface includes a base assembly with a base gear fixedly mounted thereto, and a slide rail assembly rotatable about a base axis. The slide rail assembly includes a slide rail positionable parallel to the conical surface, a slide carriage moveable along the slide rail, carrying a welding torch, a rotatable lead screw in threaded engagement with the slide carriage, and a carriage gear rotatable with the lead screw and engaged with the base gear. Rotation of the slide rail assembly moves the torch on the slide carriage circumferentially along the conical surface, and, simultaneously, rotation of the slide carriage assembly, by inter-engagement of the carriage and base gears, causes the slide carriage to move along the slide rail carrying the torch radially along the conical surface, the torch moving in a spiral path, about the base axis, along the surface.

Abstract: An apparatus for weld build-up on a surface of revolution within a bore has a head assembly, an elongated line shaft, a step assembly and a traveling assembly. The head assembly has a housing that may be fixedly mounted in a region spaced from the surface of revolution, the housing defining a chamber with an axis in alignment with an axis of revolution. It also has a spindle mounted for rotation within the chamber, coaxial with the axis of revolution. The line shaft is coupled to the spindle and extends for coaxial rotation within the bore in a region of the surface of revolution. The step assembly is fixedly mounted upon the line shaft. The traveling assembly is mounted also upon the line shaft and disposed for rotation within the bore. The traveling assembly consists of a wire reel, a wire feeder, and an electrical welding torch assembly that terminates in a torch nozzle.