Abstract: The invention relates to a method for a firm metallurgic connection of an aluminum band with a copper band through which the two bands that are moved relative to one another in their longitudinal direction are continuously cleaned from oxides in a cleaning device under protective gas at their contact surfaces and are subsequently provided to a compression device in which the bands are pressed together with their clean surfaces and connected with another to form a one-piece band including the steps: running both bands (8, 9) continuously under protective gas up to and into the compression device (4) by configuring the cleaning device (3) and the compression device (4) as a unit in a housing (7) enclosing a contiguous space, and pulling the two bands (8, 9) or the one piece band (11) through the cleaning device (3) and the compression device (4) by a pull off device (5) arranged behind (downstream) the compression device (4).

Abstract: A temperature-resistant electrical line comprises at least one central electrical conductor, an insulation, which is made from a mineral material and surrounds the electrical conductor completely, and a metallic outer tube, which bears against the insulation. The outer tube (3) has, over its entire length, a helical notch (4), which is open to the outside, and which is produced once the line is finished by means of a metal-removing tool and whose depth is at least 50% of the wall thickness of the outer tube (3), with a residual wall thickness (5) which ensures the stability thereof.

Abstract: A method of operating an electrical heating arrangement of considerable length using a heating line having at least one heating conductor surrounded by an insulation resistant to high temperatures. A metal tube (4) abutting against the insulation (3) is formed around the heating line (1) and the heating line (1), which is equipped with the metal tube (4) is inserted into a metallic tube (5) which has a diameter larger than the metal tube (4) and encloses, in addition to the heating line (1), an axially continuous clearance space (6). A non-combustible gas having a lower kinematic viscosity compared with air is inserted into the clearance space (6), the gas completely filling the latter and being kept permanently under pressure.

Abstract: The invention specifies a metal spool for receiving metallic winding material (5) in the form of a wire, which spool comprises two flanges (1, 2) in the form of circular disks, arranged parallel to one another and having the same diameter and an elongate core (3) connecting the flanges and having a circular cross section and smaller radial dimensions in comparison with the flanges (1, 2), the mid-axis of which core corresponds to the mid-axes of the flanges (1, 2). A winding space (4) for receiving the winding material (5), is delimited by the core (3) and the two flanges (1, 2). The dimensions of the winding space (4) in the direction of the mid-axis of the spool can be enlarged at an increased temperature. In addition, means are provided to bring the dimensions of the winding space (4) back to the initial position when the temperature returns to room temperature.

Abstract: A method and device for A process for removing oxide skin from cut surfaces of a thin-walled metal strip used for preparing strip material for welded pipes. The invention comprises passing the metal strip between pairs of rotating cutting tools and applying a low self-adjusting working pressure to the cut surfaces with the tools. During this process, the temperature of the metal strip is maintained below 80° C. to prevent the oxide skin from redepositing.

Abstract: An electric cable protected by a corrugated hollow metallic sheath composed of an aluminum alloy type 3004.

Abstract: In an apparatus for continuous corrugation of walls of tubes or tubular elements, especially cable components, at least one corrugating wheel, rotatable about its own axis, also rotates about the tubular element to be corrugated. In addition to a drive (15) for the rotation of the at least one corrugating wheel (11) about the tubular element (5) to be corrugated, there is provided a speed-controllable drive (16) for the rotation of the at least one corrugating wheel about its own axis.

Abstract: In a method and apparatus for manufacturing an optical fiber cable, a metal band is gradually shaped into a lengthwise slotted tube, the optical fibers are introduced into the still open slotted tube, the lengthwise slot of the tube is welded and the outside diameter of the welded tube is reduced. The welded tube with the reduced outside diameter is wound at least once around a take-up reel. A force provided on the reduced outside diameter welded tube as it is wound on the take-up reel causes an elastic strain of 0.1 to 0.6% on the tube. The strain is released on the take-up reel to produce an overlength of the optical fibers relative to the reduced outside diameter welded tube.

Abstract: A method of producing an overhead contact wire for supplying power to electrically driven vehicles is proposed which comprises a copper-clad steel wire and a copper wire that is metallically joined to the copper-clad steel wire. The method includes the following steps: a) heating a steel wire to a temperature about 950.degree. C.; b) joining first and second metal band sections to a surface of the steel wire by means of rolling at a temperature of about 950.degree. C. under protective gas atmosphere to produce a combined element; c) reducing the cross-section of the combined element by at least 20%; d) heating a copper wire to a temperature about 950.degree. C.; e) joining the heated copper wire to the reduced diameter combined element in the area covered by the first band section by rolling at about 950.degree. C. under protective gas to produce a prepared wire; and f) reducing the cross-section of the prepared wire to produce an overhead contact wire.

Abstract: A high frequency coaxial cable (1) contains a concentric internal conductor (3), a cylindrical insulating layer (7) surrounding the internal conductor (3) and made of a foamed plastic containing more than 50% by volume of air, a tubular external conductor (9) placed over the insulating layer (7), and an outer sheath (11). Cutouts (15, 15') are made in the insulating layer (7) by removing insulation material starting at the periphery (13) of the insulating layer and extending radially inward. These cutouts (15, 15') make it possible to increase the dielectric properties of the insulating layer between internal conductor (3) and external conductor (9).

Abstract: In a method and apparatus for manufacturing an optical fiber cable, a metal band is gradually shaped into a lengthwise slotted tube, the optical fibers are introduced into the still open slotted tube, the lengthwise slot of the tube is welded and the outside diameter of the welded tube is reduced. The welded tube with the reduced outside diameter is wound at least once around a take-up reel. A force provided on the reduced outside diameter welded tube as it is wound on the take-up reel causes an elastic strain of 0.1 to 0.6% on the tube. The strain is released on the take-up reel to produce an overlength of the optical fibers relative to the reduced outside diameter welded tube.

Abstract: A metallic sheath for an electric cable with a ratio of inner diameter Di to outer diameter Do of at least 0.9, comprises a lengthwise welded, annularly or helically shaped corrugated tube whose wall thickness is in a range between 0.005 and 0.009 of the outer diameter, and where the distance p between two neighboring corrugation crests is in a range between 0.08 and 0.12 of the outer diameter. In addition, a method of making the above described electric cable is described.

Abstract: A method for producing a sector conductor for electric power cables is introduced, whereby a number of metal wires are joined closely together into a core (8) with a sector-shaped cross section. A lengthwise running metal strip is formed around the core (8) and its longitudinally abutting edges are welded into a tube (9), whose dimensions are reduced so that it lies closely against the core (8) and surrounds it.

Abstract: In a method for producing lengthwise welded metal tubes, a metal tape is drawn from a supply reel and is gradually formed into a slotted tube, and the slotted tube is welded by a laser beam, the tape edges are heated by a separate laser beam. The laser beams for the heating and welding strike the lengthwise seam at an angle that is less than 15.degree. from the vertical, the distance between the burn spots produced by the laser beams is between 1 and 5 mm, and the power applied to the tape edges by the first laser beam is sufficient to raise the temperature of the tape edges to at least one half of the T.sub.F -T.sub.R difference, where T.sub.F is the fusing temperature of the metal and T.sub.R is the room temperature.

Abstract: In a method for producing internally grooved tubes for heat exchangers, a smooth metal tape is drawn from a circular supply, a rolling mill provides it with a number of grooves that are parallel to each other and run at an angle of 15.degree. to 45.degree. with respect to the lengthwise direction of the tape, the tape is continuously formed into a tube with a lengthwise slot, and the slot is welded. At least two groups of parallel grooves are rolled into the surface of the metal tape so that the grooves form a herringbone pattern.

Abstract: In a method for producing a lengthwise welded metal tube with an outside diameter of 1 to 6 mm, whereby a metal band is shaped into a lengthwise slotted tube by a forming tool, and the lengthwise slot of the tube is welded by a laser welding installation, the tube to be welded passes immediately before and immediately after the welding point area through a guide that guides the surface of the tube to keep the edges of the band in contact with each other and keeps the welded seam stress-free. The jaws of a clamping tool grip the welded tube immediately downstream of the guide to keep it from twisting.

Abstract: A method for manufacturing a coaxial cable is described, whereby a dielectric layer (2) is extruded over an inner conductor (1), a lengthwise incoming metal strip (3) is formed into a tube, having a lengthwise slot around the insulated conductor (1, 2). The tube (3) is welded along the slot to thereby form a welded seam (4), and the welded tube is drawn down onto the surface of the dielectric layer (2). A metal strip (3a) having a plastic coating (3b) at least on one of its major surfaces is used to form the tube (3), and its lengthwise edges are welded by a laser (19).

Abstract: An apparatus for the continuous marking of elongated stock moving in the direction of extension of the stock and including one or more nozzles for directing a dye-jet towards the elongated stock is improved by causing the nozzles to oscillate in a plane parallel to the direction of movement of the elongated stock to be marked; and the jets as produced by flows in the respective nozzle along the plane of oscillation and are redirected to emerge at right angles to the plane of oscillation; the nozzles either include a first duct extending in the nozzle body in a particular direction and being continued in a second duct extending at 90 degrees; alternatively a nozzle is a tube of L-shaped configuration.

Abstract: In known cables, the cable core is surrounded by a metallic inner layer of a sheath, and the inner layer is enclosed by a corrugated metallic outer layer of the sheath. In these cables, a high resistance against corrosion and high temperatures at a good shielding of the electric conductors is not ensured.The new cable (1) including the inner sheath layer (19) which is made of at least one flexible copper band (11) and defined by an electromagnetic shielding with a shielding attenuation from 80 to 115 dB, with the shield attenuation in this range being dependent from the wall thickness of the inner layer and rising monotonously with increasing wall thickness, and the outer sheath layer (27) which is made of a steel band and increases the high temperature resistance of the cable 1, has the advantages of a good temperature resistance even at high ambient temperatures, like e.g. in case of fire, and a high resistance with regard to corrosion.

Abstract: A capstan draw apparatus that includes a plurality of split clamps; a plurality of support carriages each having one of the split clamps positioned thereon; an endless chain drive mechanism for concurrently pulling each of the support carriages; and an elongated guide frame mechanism for successively closing and opening the split clamps about an elongated member. The apparatus further includes an endless lateral guide frame mechanism including first and second oppositely disposed, parallel endless lateral guide frames that are spatially positioned parallel to the endless chain drive mechanism and extend on opposite sides of the plurality of support carriages for continuously supporting each of the carriages in a positively guided manner for uniform movement thereof throughout their entire endless paths of rotation.