Welding apparatus

Apparatus for welding a tube to a tube sheet, comprising, a rotor, means for supporting and rotating said rotor about a rotor axis, locator means for positioning said rotor axis with respect to the tube being welded, a bushing support mounted to said rotor for radial adjustment with respect to said rotor axis, a bushing, means interchangeably supporting said bushing offset from said rotor axis in said bushing support, and a weld torch supported in said bushing for rotation with respect thereto, and a weld filler wire feed mechanism mounted on said rotor, a feed mechanism drive motor mounted on said rotor, and brush means and commutator means mounted on said rotor and said rotor supporting means for conducting electricity to said drive motor on said rotor.

Apparatus for welding a tube to a tube sheet, comprising, a rotor, means for supporting and rotating said rotor about a rotor axis, locator means for positioning said rotor axis with respect to the tube being welded, a bushing support mounted to said rotor for radial adjustment with respect to said rotor axis, a bushing, said bushing support comprising a bushing block having an opening therethrough for carrying said bushing, said rotor having a slot therein extending radially with respect to said rotor axis, said bushing block being mounted to said rotor in said slot for adjustment therein radially with respect to said rotor axis, means interchangeably supporting said bushing offset from said rotor axis in said bushing support, and a weld torch supported in said bushing for rotation with respect thereto, said weld torch having a weld electrode projecting therefrom on a tip axis which is non-parallel with the axis of said bushing to allow selection of the angular relation between said rotor axis and said tip axis by the position of said bushing with respect to said bushing support.