Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
  • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
  • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
  • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
  • B21D26/06—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure by shock waves
  • B21D26/08—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure by shock waves generated by explosives, e.g. chemical explosives
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K15/00—Electron-beam welding or cutting
  • B23K15/0006—Electron-beam welding or cutting specially adapted for particular articles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
  • B23K20/06—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of high energy impulses, e.g. magnetic energy
  • B23K20/08—Explosive welding
  • B23K20/085—Explosive welding for tubes, e.g. plugging
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
  • B23K26/20—Bonding
  • B23K26/21—Bonding by welding
  • B23K26/24—Seam welding
  • B23K26/28—Seam welding of curved planar seams
  • B23K26/282—Seam welding of curved planar seams of tube sections
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
  • F16L57/06—Protection of pipes or objects of similar shape against external or internal damage or wear against wear
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L9/00—Rigid pipes
  • F16L9/02—Rigid pipes of metal

Definitions

• a metal tube of the type concerned here in that the support tube is metallically connected to the inner tube at both ends over a length of at least half the wall thickness of the metal tube. This ensures a very reliable and durable surface seal between the support tube and the inner tube.
• the metal tube according to the invention can also be designed such that the support tube is connected in a line-shaped or punctiform manner to the inner tube in the region between the connections existing at both ends. This allows, for example, the bending or torsional rigidity of the entire metal tube to be increased. This measure also increases the durability of the pipe lining.
• the metal tube according to the invention can also be designed such that the inside of the support tube is lined with at least one further inner tube, which is metallically connected to the other inner tube at both ends over a length of at least half the wall thickness of the metal tube. Accordingly, it is possible to arrange a plurality of inner tubes on the inside of the support tube, which can have complementary, differing mechanical or thermal properties.
• the metal tube according to the invention can also be designed such that the support tube is clad tightly from the outside with at least one outer tube and can thus be additionally protected from the outside.
• the metal tube according to the invention can also be designed such that the inner tube / the inner tubes and / or the outer tube is / are made of a higher quality material than the support tube.
• acid-resistant metals or materials with a particularly high mechanical strength come into consideration.
• the metal tube according to the invention can also be designed such that the metallic connections are each produced by explosion, laser or electron welding.
• the metal tube according to the invention can also be designed such that the support tube is formed in several parts in the axial direction.
• the support tube in the axial Mid-range materials of relatively low quality on the other hand, higher-quality materials are used on the ends of the supporting tube, where, for example, the highest mechanical stresses occur due to the combination with other tubes.
• the metal tube is then extremely corrosion-resistant and mechanically stable.
• the support tube has at least one end a flange or a threaded end piece and that the flange or threaded end piece is made of a different, but in particular a higher quality material than the support tube.
• the support pipe and the inner or outer pipes are pushed into one another and introduced into a vacuum space and then proceed in one go, from one end of the metal pipe to the other , the metallic Verbindun ⁇ gen at the ends and a snug fit of the inner and outer tubes or to the supporting tube by exp "Os ⁇ ve welding and forming are created. This is particularly important that alltechnisch ⁇ - steps for manufacturing the pipe can be done in one gear.
• annular gap (s) between the support tube and the inner or outer tube (s) provision can be made for the annular gap (s) between the support tube and the inner or outer tube (s) to be sealed and evacuated, which from the inside or metal tube provided with at least one explosive charge is immersed in a water bath and then progressing in one move, from one end of the metal tube to the other, the metallic connections at the ends and a close-fitting fit of the inner or Outer tubes with the support tube are generated by explosive welding and forming.
• the explosive welding and reshaping carried out in a water bath enables precise metering and equalization of the explosive force.
• FIG. 1 shows an axial section through a multi-part metal tube with two flange end pieces
• FIG 3 shows an axial section through a one-piece metal tube.
• the metal tube shown in FIG. 1 is composed of a multi-part support tube 1, 2, 3 with a center piece 1 and flanges 2, 3 located at the ends, each of which is connected to one another via welds 4.
• the flanges 2, 3 can be made of a mechanically stronger material than the center piece 1.
• the support tube 1, 2, 3 is lined with an inner tube 5 which is tightly fitted on the inside.
• the inner tube 5 can be made here from a particularly corrosion-resistant material.
• the inner tube 5 is metallically connected to the support tube 1, 2, 3 by means of two-dimensional welds 6 located at the ends and by spot welds 7 in the intermediate area between the ends.
• the welds 6 are in axial axial - o - tung extended to a length of at least half the wall thickness of the metal pipe.
• the metal tube shown in FIG. 2 has a support tube 8, 9, 10, which is composed of a central piece 8 and two threaded end pieces 9, 10, the threaded end pieces 9, 10 being made of a higher quality, mechanically stronger material than the middle piece 8.
• the individual pieces of pipe are connected to one another by means of welds 11.
• the threaded end piece 9 has an internal thread 12, while the threaded end piece 10 has an external thread 13. Both types of thread are compatible, so that a longer pipe system can be assembled from this metal tube by screwing it to other metal tubes.
• the support tube 8, 9, 10 can in this case be lined with two inner tubes 14, 15 which are each different in terms of material, and can be clad with an outer tube 16 which is closely fitting on the outside.
• Corrosion-resistant or acid-resistant materials can be provided for both the inner tube 15 and the outer tube 16.
• the two inner tubes 14, 15 and the outer tube 16 are also metallically connected to the support tube 8, 9, 10 via area welds 17, 18.
• spot welds 19 are provided on the inner tubes 14, 15.
• FIG. 3 shows a metal tube which is composed only of a one-piece support tube 20 and an inner tube 21, which can be metallically connected to the support tube 20 by area welds 22 located at the ends.
• punctiform or linear connections can also be provided here in the intermediate area between the ends.
• the welds 22 are extended in the axial direction over a length of at least half the wall thickness of the metal tube.
• a tube of this simple design can serve, for example, as a semi-finished product for further processing.
• any number of pipes of this type can also be easily made into longer pipes by conventional welding methods. Systems. Such pipe systems are then protected, for example, from the inside particularly effectively against corrosion.
• a protective outer tube (not shown here) can also be provided here.
• the support tube 1, 2, 3, 8, 9, 10, 20 can first be assembled from a center piece 1, 8 by conventional welding methods and, in the case of a multi-part tube, from two " end pieces 2, 3, 9, 10

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• Fluid Mechanics (AREA)
• General Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Chemical & Material Sciences (AREA)
• Plasma & Fusion (AREA)
• Rigid Pipes And Flexible Pipes (AREA)
• Pressure Welding/Diffusion-Bonding (AREA)
• Welding Or Cutting Using Electron Beams (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6455533

Family Applications (1)

Country Status (2)

Cited By (4)

Families Citing this family (10)

Citations (6)

• 1992
  • 1992-03-31 DE DE4210547A patent/DE4210547C1/de not_active Expired - Fee Related
• 1993
  • 1993-03-31 WO PCT/DE1993/000299 patent/WO1993020382A1/de not_active Ceased

Patent Citations (6)

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