Abstract: Method for continuously manufacturing plastic-lined metallic pipe. The method includes an extruder having an output providing a plastic sleeve and further includes a continuous roll-forming tubing mill production line. This production line includes a series of forming rolls which progressively deform a substantially flat steel strip to a generally tubular configuration as the strip moves along a straight-line longitudinal path. The production line further includes an electrical resistance or high frequency welder which continuously welds the lateral edges of the moving strip to complete the pipe. The method also includes a feed for the plastic sleeve into the incipient metal pipe upstream of the welder. The plastic sleeve has an outside diameter slightly smaller than the inside diameter of the metallic pipe in its as-formed condition. Furthermore, the plastic sleeve maintains a generally tubular configuration from the time it enters the pipe until the manufacture of the plastic-lined pipe is completed.

Abstract: A method and apparatus for forming thin-wall tubing in a funnel die or with a series of sets of forming rollers. The tubing is then welded by a method and apparatus which includes simultaneous guiding of the both the inner and outer peripheries of the tubing during the welding operation by a mandrel and a sleeve, respectively, so that lack of rigidity of the tubing is not a limitation. The edges of the tubing are not clamped, but are allowed to "float" during welding in one embodiment, a water-cooled heat sink is used to remove the heat of welding. The resulting tubing is highly uniform. A wide range of tubing materials can be welded and thin-wall tubing of nearly any desired length or wall thickness can be produced.

Abstract: In a method and apparatus of forming a flat metal strip into a tube having generally flat side walls connected by bight portions along their opposite longitudinal edge portions comprising the steps of directing the strip between a pair of form rolls to bend the opposite longitudinal edge portions of the strip into similar generally upwardly curved edge portions; then directing the strip between a second set of rolls which engage the upwardly curved edge portions to center the strip laterally relative to the rolls and bend the strip along its longitudinal center line to form an upwardly rounded bend therealong while maintaining the portions of the strip on the opposite sides of the center bend relatively flat whereby to impart to the strip a V-shaped cross section having a central apex and oppositely upwardly inclined flat legs, each terminating in a laterally inwardly curved edge; directing the V-shaped strip between one or more additional sets of form rolls to increase the circumferential extend of said apex

Abstract: In the manufacture of welded pipes, edge buckling or waving of the strip is prevented by heating. In one method, during the process for bending the strip into a tubular form, the edges of the strip are heated so that tensile stress exerted thereon is reduced to a minimum and, thereafter, before the edges are abutted against each other, the strip is wholly heated so that the compressive stress exerted on the edges is reduced to a minimum. According to another mode, during the process for bending the strip gradually into a tubular form or during the process in which the edges of the strip are held in abutment against each other, the strip except its portions of the edges is substantially or partially heated so that the strip except its portions of the edges is subjected to compressive stress while the portions of the edges are subjected to tensile stress, and under these conditions the edges are welded together.

Abstract: A method and apparatus for forming thin-wall tubing in a funnel die or with a series of sets of forming rollers. The tubing is then welded by a method and apparatus which includes simultaneous guiding of the both the inner and outer peripheries of the tubing during the welding operation by a mandrel and a sleeve, respectively, so that lack of rigidity of the tubing is not a limitation. The edges of the tubing are not clamped, but are allowed to "float" during welding. The resulting tubing is highly uniform. A wide range of tubing materials can be welded and thin-wall tubing of nearly any desired length or wall thickness can be produced.

Abstract: A system for making a long length of seam-welded tubing from shorter lengths of flat metal strip which are spliced end-to-end and formed into tubular form and seam-welded. Adjoining ends of two successive lengths of the strip are trimmed at supplementary angles, one of which is an acute angle. The trimmed ends are abutted and welded, preferably with weldment extending beyond each such end. All surfaces of the weld are finished to match the dimensions of the strip. The tubing, along with the welded joints, is heat treated as the tubing is formed to produce a product substantially free of internal surface roughness along the splice welds.

Abstract: A die-drawing and/or extrusion device is described for producing uniform and tapered metal and composite tubes from flatstock and for reducing the size of solid stock and formed tubes therefrom, and lamination of compatable materials in one operation. The die comprises opposed die elements having curved helical tracks or grooves which follow a central orifice through which the flatstock, solid stock, tubes, etc., are pulled and/or pushed. Wedge-shaped shaping and alignment elements are positioned in the helical tracks in contact with the dies to align the feedstock with the die orifice, and to prevent the metal sheet or tube, rod, etc., from being drawn in between the tangential surfaces of the dies. The extent of product taper is determined by the pull rate applied to the feedstock in conjunction with the rotational rate of the dies, which can be varied continuously.

Abstract: An apparatus for continuous production of seam-welded steel tubing is proposed. The apparatus includes a series of shaping rolls for shaping a strip taken out from a strip coil into a tubular intermediate product, the roll series including a finpass roll group. The tubular product is subjected to seam welding under the action of a seam welder. Before arrival at the welder, a substantial main part of the preformed tubing with exception of opposing edge zones thereof is subjected to heating by a heater compensate for excess compressive stresses induced in the edge zones, while these zones are subjected to cooling by a cooler for avoiding otherwise formation of disadvantageous edge wavings which would otherwise occur.

Abstract: A process of continuous production of seam-welded steel tubing is concerned.A steel strip is taken out from a strip coil and conveyed to a tube-preshaping step including a plural of shaping roll stand positions. In the preshaping step, the strip is laterally rounded up gradually from band strip to a rough-shaped tubing until the side edges are brought into a mutually abutting state ready for seam-welding. The preshaping step is divided into a plurality of local regions. In these local regions, substantially body portion with exception of corresponding marginal edge zones of the tubing stock is separately subjected to heating. The heating width and heating intensity at these regions are increased stepwise as the tubular stock advances from upstream to downstream for avoiding conventionally appearing edge wavings and buckling undulations in the material of the steel tubing.

Abstract: The present invention is directed to a method and apparatus for forming seam welded tubes in which the positions of cage rolls are adjusted in accordance with the thickness, substance and size of a material to be formed into a tube in a process for forming a tube blank for a seam-welded tube by using cage rolls.

Abstract: In the manufacture of welded pipes, edge buckling or waving of the strip is prevented by heating. In one method, during the process for bending the strip into a tubular form, the edges of the strip are heated so that tensile stress exerted thereon is reduced to a minimum and, thereafter, before the edges are abutted against each other, the strip is wholly heated so that the compressive stress exerted on the edges is reduced to a minimum. According to another mode, during the process for bending the strip gradually into a tubular form or during the process in which the edges of the strip are held in abutment against each other, the strip except its portions at the edges is substantially or partially heated so that the strip except its portions at the edges is subjected to compressive stress while the portions of the edges are subjected to tensile stress, and under these conditions the edges are welded together.

Abstract: An elongated spacer is disclosed for use in separating the glass panes in multiple-glazed thermal windows. The spacer has an elongated hollow interior for storing a dessicant material and a plurality of moisture barrier partitions at intervals along the length of the interior. The spacers are originally manufactured in oversized lengths and later cut to fit particular windows. The partitions divide the elongated interior into subcompartments, and when the spacer is cut to length the partitions confine moisture contamination and dessicant loss to the particular subcompartment which is cut.

Abstract: A guide rail serves for bringing together the edges of blanks of sheet metal rolled to form cylinders. The guide rail contains curved guide slots for the sheet metal edges. The guide slot bases are planar and converge toward the exit end of the guide rail. The sheet metal edges guided in the curved guide slots tend--after a first weld point has been made--to translate toward one another due to their innate elasticity.

Abstract: Thermic lances are produced in a continuous process comprising the following steps:a metallic strip successively passes in different shaping frames to obtain a profile, the section of which being approximately U-shaped;the wires forming the filling are introduced in the U-shaped profile before the said profile is closed by bringing together both edges of the U-shaped profile in order to shape a tube;the tube is welded by low frequency using a seam welding wheel, the profile being simultaneously submitted to an outer deformation which brings together both edges of the U-shaped profile; andfinally the obtained filed tube passes through one or more finishing frames.

Abstract: In a method of forming an electric welded steel tube, wherein a hot-rolled sheet is formed into a cylindrical shape, with the central portion thereof being lowered as the forming progresses, and thereafter, subjected to reduction in the circumferential direction of the tube by means of tandem type fin-pass rolls to be finished into the tube, the proper forming condition ranges capable of eliminating occurrence of edge waves in the tube seam edge portion and/or of cambers in the longitudinal direction of the tube by three forming conditions factors including the downhill value D.sub.H (downhill coefficient .eta.) of the hot-rolled sheet, the fin-pass total reduction R of the tandem type fin-pass rolls and the distribution of the fin-pass reduction (the distribution ratio .delta. of the first fin-pass reduction).

Abstract: A method for the continuous production of exhaust pipes for automotive vehicles comprises the steps of continuously withdrawing an elongated substantially flat metal strip from a coil and subsequently bending and forming the moving strip into a longitudinally slitted tube strand. The opposite faces of the slitted pipe strand are then welded together and subsequently the pipe strand, while still moving, is severed into pipe sections of predetermined length and the pipe sections are then transferred to at least one bending apparatus for bending the pipe sections into exhaust pipes with predetermined bends; and an apparatus for carrying out the above method.

Abstract: A complementary pair of top and bottom rolls for the initial breakdown step of a skelp in the manufacture of welded tubular products by rolling. The bottom roll has a convex midportion, a pair of concave end portions, and a pair of straight border portions each lying between the midportion and one of the concave end portions. The top roll is shaped in complementary relation to the bottom roll to define therebetween a path for the skelp. The breakdown roll pair of the above configuration makes it possible to curl the opposite edge portions of the skelp into arcs of a desired radius without the usual defects of rolling, and in such a way that the skelp can be subsequently rounded and have its edges welded together into a tube of minimal out-of-roundness.

Abstract: This invention relates to the means of continuously seam-welding the areas to be joined together of steel strips formed like tubes in the production of hot-dip metal-coated steel tubes from steel strips in a continuous supply. This seam welding device is capable of manufacturing electric seam-welded tubes with high efficiency and operational safety.

Abstract: A metal pipe forming mill progressively forms a flat metal sheet into a circular form along the mill axis by forming rolls including pairs of cage rolls. A cage-roll unit in this type of mill has a pair of movable bases disposed on both sides of the mill axis, with the space between the two movable bases being freely adjustable, and a pair of stands mounted on the movable bases, one on each. The stands rotatably support, on their surfaces facing the mill axis, two or more pairs of cage rolls, one pair following another along the mill line.

Abstract: Markings are placed alongside the gap of a split tube and their distance is measured downstream from the point of welding; the measuring result is used to control upsetting pressure in the weld print.

Abstract: A method for manufacturing thin-walled metal tubes and structures utilizing thin-walled metal tubes. A continuous metal tube is formed by passing longitudinally-extending metal tape through forming tools which bend the lateral edges of the metal tape towards each other to form the tube. A continuous wire or tape is wrapped in the form of a helix around the tube. The wrapped tube is heated to melt soldering material that joins the lateral edges of the folded metal tape to each other. The soldering material can take the form of a separate sheet positioned between the wire or tape and the folded tube, a coating applied to the wire or tape, or a coating applied to a surface of the metal tape. The thin-walled tube is attached to other members to form composite structures.

Abstract: Material is drawn from a roll of flat stock, passed through a pipe forming machine, and welded to provide a continuous length of pipe which is stored in a variable size loop. Pipe is withdrawn from the loop by means of a series of pipe straightening and feeding rollers which feeds the pipe to a bending machine. The bending machine is suspended from an overhead platform for rotation about a vertical axis and carries a shearing cutter so that multi-bend pipe sections, such as automobile exhaust pipes, may be bent, severed and dropped onto a conveyor for inspection and disposition while the pipe is being continuously formed from the flat stock. Distance between bends and plane of bend are respectively controlled by the pipe feeder and the bend machine rotation. Differences between forming and bending rates are compensated by varying the amount of pipe in the storage loop.

Abstract: This disclosure relates to a method and apparatus for manufacturing zinc coated steel tubing from zinc coated steel strip. The zinc lost by volatilization during welding of the seam is replaced in a two-stage metallizing process. In the first stage an aluminum alloy is spray atomized onto the tubing. The alloy contains from 0.45 to 0.95 weight percent iron, no more than 0.10 weight percent silicon, and the remainder aluminum with associated trace elements. Thereafter, in the second stage, zinc is spray atomized over the aluminum alloy-coated substrate.

Abstract: A rolled sheet metal tube having perforations therein with integrally formed associated protrusions. The protrusions alter the direction of the flow of fluid passing through the tube and ideally suit the tube for employment in mufflers for internal combustion engines. A tube mill incorporating a roll press as its first pass to perforate sheet metal strip as it is fed to the mill. The roll press comprises a die roll having circumferentially continuous slots extending therearound and a punch roll having spaced punches for entry into the slots of the die roll as sheet metal strip is drawn between the rolls. The punches form perforations in the strip as the strip is drawn between the rolls and in certain embodiments the slots and/or punches are configured to form protrusions in the strip simultaneously with the formation of the perforations.

Abstract: In a butt-welded steel pipe manufacturing equipment, an edge portion temperature and a center portion temperature of a steel strip are detected at a location between the outlet of a heating furnace and the inlet of a butt-welding mill. The heating condition of the steel strip in the heating furnace is controlled in accordance with the difference between the edge portion temperature and a target edge portion temperature, and the transporting speed of the steel strip is controlled in accordance with the difference between the edge portion temperature and the center portion temperature and with the difference between the target edge portion temperature and a target center portion temperature.

Abstract: Metallic tubing is manufactured from galvanized steel strip by forming the strip into tubular shape, welding the edges together and replacing the zinc lost in welding by atomization metallizing the weld zone first with an aluminum alloy containing from more than about 0.30 to about 0.95 weight percent iron and then with zinc.

Abstract: A method and apparatus for ultrasonically welding the overlapped portions of a continuous metal strip that has been rolled about a longitudinal axis to form a tubular product. The metal strip is rolled around the outer surface of an internal mandrel by means of one or more forming tools disposed around the mandrel. At the exit end of the forming tool, a stationary, rigid, non-resonant anvil is formed by a portion of the outer surface of the mandrel so that the anvil is located inside the rolled metal strip and supported by that portion of the mandrel which extends outwardly between the longitudinal edges of the strip upstream of the point where the strip edges are brought together. As the rolled metal strip is advanced, the longitudinal edges thereof are overlapped and passed over the anvil.

Abstract: A butt welded tube is provided having excellent properties by the steps of forming a skelp onto a round shape, butt welding the edges thereof with butt welding rolls, blowing oxygen or air into the weld zone, so that said zone is brought to a melted condition with oxidizing heat based on said blowing and some notches which are formed are blown off with said blowing, and then said tube is passed through a train of reducing rolls to obtain a smooth surface and the required dimension of said tube.