Abstract: A method of efficiently manufacturing electric resistance welding pipes having excellent characterization of welded seams is provided, by which each lateral edge of a rounded strip immediately before electric resistance welding is securely shaped with desired tapering flexibly in response to change in strip thickness, so that welding quality may be kept to be excellent. A method of manufacturing electric resistance welding pipes, in which a strip is subjected to forming, then edges thereof are formed to substantially face each other, and then the edges are subjected to electric resistance welding to form a pipe, wherein an edge and an edge opposed thereto at one of an upper-surface side and a lower-surface side of the strip are shaped with tapering before the forming by means of cutting or shaving, or finpass forming.
Abstract: An apparatus applies a wear coating on the interior surface of conduits, particularly conduit elbows, in which the weld head applying a weld bead forming the wear coating is supported by a wheel engaging the bottom surface of the conduit and interconnected with a push/pull cart mounted on a linear support frame exteriorly of the conduit by a plurality of linkage elements. Each of the head element and the linkage elements include a centralizing joint having a pair of transversely opposing rollers that engage the lateral sides of the conduit to maintain a consistent positioning of the welding arm at the distal end of the apparatus. The welding arm includes a three-axis adjustment for the welding torch tip for accurate location thereof within the conduit. Positional adjustment of the welding torch tip is provided by independent electric motors associated with each pivot axis in the welding arm.
Abstract: A method for producing a longitudinally welded hollow profile from a sheet metal blank having defined longitudinal edges, in which the sheet metal blank is initially preformed into an open seam profile with the aid of at least two tool parts allows for the economical production of accurately formed hollow profiles. This is achieved in that to produce the open seam profile, the sheet metal blank, by a change in the relative position of the tools parts, is placed freely around a mandrel positioned between the tool parts and extending in the longitudinal direction of the sheet metal blank, the outer shape of which mandrel determines the inner shape of the hollow profile to be produced, and in that the shaping of the open seam profile obtained is then completed in one or more stages in each case by a further change of the relative position of the tool parts.
September 8, 2005
Date of Patent:
March 22, 2011
ThyssenKrupp Steel AG
Michael Brüggenbrock, Thomas Flehmig, Wladimir Rituper, Mohamed Tohfa
Abstract: In a method of making a tube, a sheet metal blank is placed in a U-shaped cavity of a lower mold of a shaping tool, and pressed into the cavity by a ram to shape the blank into a U-shaped configuration. In a next process step, the U-shaped blank is formed between an upper mold and a lower mold of a molding press into a tubular configuration. The upper and lower molds of the molding press with accommodated tubular profile are then clamped together and the clamped upper and lower molds are then removed from the molding press. Subsequently, the confronting longitudinal edges of the tubular profile are welded together via an opening that provides access to the longitudinal edges. After separation of the upper mold from the lower mold, another shaping cycle may begin.
Abstract: One method for welding includes obtaining a heat-exchanger tube having an outward fold. The tube is inserted at least partially through the orifice of a tubesheet with the fold contacting one of the outward and inward facing sides of the tubesheet. A first electrode is positioned in contact with the outward fold and a second electrode in contact with the one side of the tubesheet. Another method for welding includes obtaining a heat-exchanger tube having a tube end. The tube is inserted at least partially through the orifice of a tubesheet. A first electrode is positioned in contact with the first tube end and a second electrode is positioned in contact with one of the outward and inward facing sides of the tubesheet. The first electrode is moved against the first tube end to create an outward fold with the outward fold contacting the one side of the tubesheet.
June 28, 2005
Date of Patent:
August 7, 2007
Delphi Technologies, Inc.
Venkatasubramanian Ananthanarayanan, James M. Payne, Deepak K. Sharma, Kenneth E Johnson, Andrzej Marian Pawlak
Abstract: During manufacture of certain hollow profiles suitable for use in car body construction the welded profiles are subjected to a further deformation process, namely hydroforming. At present the corresponding welding machines are charged manually. The invention relates to a method and a device for transferring hollow-profile blanks, characterized in that during transfer the positioned fusion faces of the blanks are pressed against each other at least in the area of the weld.