Abstract: An automated pipeline rehabilitation apparatus (10) is disclosed. The apparatus employs a centering assembly (24) with pivoting arms (26, 28) which can pivot between an operating position and a installation/removal position to allow the unit to be removed from a pipeline. Arcuate rings (38, 40) are mounted on the arms. Spray nozzles (44) are mounted on the arcuate rings for reciprocating arcuate motion along the rings to treat the pipeline. The nozzles (44) can be used to clean the pipeline and prepare the outer surface of the pipeline with high pressure water jets in training abrasives. The nozzles (44) can also be used to apply a coating, preferably a polyurethane coating to the pipeline.

Abstract: Internal welding head apparatus, wherein a welding torch is mounted on a pivotal support for movement of the torch toward and away from the weld site, and wherein the torch is carried on a rotative shaft to be oscillated transversely by oscillation of the rotative shaft, oscillation of the rotative shaft being accomplished by rotation of an eccentric in a yoke fixed to the rotative shaft, and wherein the oscillations are dampened by spring means disposed at opposite sides of the rotative shaft. The apparatus is compact, and is adapted to be mounted on a carrier to be rotated about the interior of a pipe or tank, or the like.

Abstract: A capstan drive assembly for electric arc welding receives filler wire which can have an undetermined cast to the wire. The assembly provides for self feeding of the wire from the inlet completely through to a welding torch. No portion of the assembly must be opened or disassembled to feed the filler wire. The wire is captured in a groove on the periphery of a capstan and held in place by spaced apart pressure rollers which serve to impart a predetermined cast to the filler wire. The predetermined cast overcomes any previous cast which was present in the wire. After the wire has received this cast, it is directed between opposite sides of wire straightening rollers which serve to bend the wire in the opposite direction of the predetermined cast and apply sufficient force to counteract the set cast. This apparatus and procedure results in producing a filler wire which is substantially straight.

Abstract: This invention relates to automatic welding of confronting edges of two bodies between which is a groove to be filled with a material and, more particularly, to conditioning, processing and use of control signals representative of an integration of the absolute product of the differences between the arc voltage at the sidewall and the centerline arc voltage and the arc current at the sidewall and the centerline current for an integration window near the sidewall for automatic reversal of the traversing welding torch.

Abstract: Welding carriage, including an articulated body having support wheel sets on its end sections, one of said end sections supporting a drive assembly movable toward and away from a track upon which the carriage travels, the drive assembly including two tandem drive wheels driven by an electric motor supported by the drive assembly. The carriage may support one welding head or plural welding heads, so that one or more weld beads may be formed as the carriage travels past a section of a welding groove.