Abstract: The apparatus resurfaces the interior of a tubular pipe or other constant radius cylindrical structure by depositing a series of contiguous, coaxial weld beads on the surface of the structure. The apparatus comprises a chuck for holding and rotating the structure to be resurfaced while a weld head is positioned within a free end of the structure. Upon each 360 degree rotation of the structure, the weld head deposits a continuous circular bead on the structure surface and upon the completion of each bead, the head is moved a predetermined increment axially within the structure whereupon a further bead is drawn in a similar manner.