Abstract: A portable welding jig, for positioning and manipulating a workpiece, configured for pipe-flange welding at remote locations and capable of establishing automatically a two-holed flange configuration, is comprised of a rotatable shaft adjustably secured to a support, wherein the shaft rotates about a longitudinal work axis, and an adjustment member for orienting the shaft in a positioning plane containing the work axis; a flange mounting member depending from the distal end of the shaft, including a flange mounting plate member for receiving a flange and presenting same for rotation about the work axis in a working plane generally normal to the positioning plane; and indexing members for locating a flange borne upon the mounting plate in a two-holed configuration within the plane.