Abstract: An apparatus (10) for welding a bore of a work piece (24) includes a torch tube (18) carrying a welding torch (20). The torch tube is removably connected to a housing (12) which houses a rotating drive motor (14) for rotating the torch tube (18). A feed screw (34) extends from the housing. The axial position of the feed screw (34) is controlled by an axial positioning motor (16). In use, align bore bearings (26,28) are mounted to the work piece (24). Torch tube (18) is then positioned within the align bore bearings (26,28). The torch tube is then fixed in the housing. Feed screw (34) is adjusted until its free end contacts the work piece (24). Welding commences when drive motor (14) starts rotating the torch tube (18). In order to deposit a bead of weld metal in the bore, the feed screw (34) is moved to adjust the axial position of the torch tube (18) and housing (12) relative to the work piece (24).

Abstract: An apparatus (10) for welding a bore of a work piece 24 comprises a torch tube 18 carrying a welding torch 20. The torch tube is removably connected to a housing (12) which houses a rotating drive motor (14) for rotating the torch tube (18). A feed screw (34) extends from the housing. The axial position of the feed screw (34) is controlled by an axial positioning motor (16). In use, align bore bearings (26,28) are mounted to the work piece (24). Torch tube (18) is then positioned within the align bore bearings (26,28). The torch tube is then fixed in the housing. Feed screw 34 is adjusted until its free and contacts the work piece (24). Welding commences when drive motor 14 starts rotating the torch tube (18). In order to deposit a head of weld metal in the bore, the feed screw (34) is moved to adjust the axial position of the torch tube (18) and housing (12) relative to the work piece (24).