Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
  • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
  • B21C37/06—Manufacture of metal sheets, bars, wire, tubes 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
  • B21C37/15—Making tubes of special shape; Making tube fittings
  • B21C37/154—Making multi-wall tubes
• • 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
  • B23K26/36—Removing material
  • B23K26/38—Removing material by boring or cutting
• • 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
  • B23K9/00—Arc welding or cutting
  • B23K9/02—Seam welding; Backing means; Inserts
  • B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
  • B23K9/0282—Seam welding; Backing means; Inserts for curved planar seams for welding tube sections
• • 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
  • B23K9/00—Arc welding or cutting
  • B23K9/04—Welding for other purposes than joining, e.g. built-up welding
  • B23K9/044—Built-up welding on three-dimensional surfaces
  • B23K9/046—Built-up welding on three-dimensional surfaces on surfaces of revolution
  • B23K9/048—Built-up welding on three-dimensional surfaces on surfaces of revolution on cylindrical surfaces
• • 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
  • B23K9/00—Arc welding or cutting
  • B23K9/16—Arc welding or cutting making use of shielding gas
  • B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
• • 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
  • B23K9/00—Arc welding or cutting
  • B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
  • B23K9/232—Arc welding or cutting taking account of the properties of the materials to be welded of different metals
• • 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
  • B23K9/00—Arc welding or cutting
  • B23K9/235—Preliminary treatment
• • 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
  • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
  • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
  • F16L58/04—Coatings characterised by the materials used
  • F16L58/08—Coatings characterised by the materials used by metal
• • 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
  • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
  • F16L58/18—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings
  • F16L58/181—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings for non-disconnectible pipe joints
• • 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
  • B23K2101/00—Articles made by soldering, welding or cutting
  • B23K2101/04—Tubular or hollow articles
  • B23K2101/06—Tubes
• • 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
  • B23K2101/00—Articles made by soldering, welding or cutting
  • B23K2101/04—Tubular or hollow articles
  • B23K2101/10—Pipe-lines
• • 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
  • B23K2103/00—Materials to be soldered, welded or cut
  • B23K2103/02—Iron or ferrous alloys
  • B23K2103/04—Steel or steel alloys
• • 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
  • B23K2103/00—Materials to be soldered, welded or cut
  • B23K2103/16—Composite materials, e.g. fibre reinforced
  • B23K2103/166—Multilayered materials
• • 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
  • B23K2103/00—Materials to be soldered, welded or cut
  • B23K2103/18—Dissimilar materials
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
  • B29C63/0004—Component parts, details or accessories; Auxiliary operations
  • B29C63/0013—Removing old coatings
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
  • B29C63/0017—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor characterised by the choice of the material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
  • B29C63/0073—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor of non-flat surfaces, e.g. curved, profiled
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
  • B29C63/48—Preparation of the surfaces
  • B29C63/481—Preparation of the surfaces mechanically
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
  • B29C63/48—Preparation of the surfaces
  • B29C63/486—Preparation of the surfaces of metal surfaces
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
  • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
  • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
  • B29C65/565—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits involving interference fits, e.g. force-fits or press-fits
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
  • B29C65/72—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by combined operations or combined techniques, e.g. welding and stitching
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C66/00—General aspects of processes or apparatus for joining preformed parts
  • B29C66/01—General aspects dealing with the joint area or with the area to be joined
  • B29C66/05—Particular design of joint configurations
  • B29C66/301—Three-dimensional joints, i.e. the joined area being substantially non-flat
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C66/00—General aspects of processes or apparatus for joining preformed parts
  • B29C66/01—General aspects dealing with the joint area or with the area to be joined
  • B29C66/349—Cooling the welding zone on the welding spot
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C66/00—General aspects of processes or apparatus for joining preformed parts
  • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
  • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
  • B29C66/52—Joining tubular articles, bars or profiled elements
  • B29C66/522—Joining tubular articles
  • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C66/00—General aspects of processes or apparatus for joining preformed parts
  • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
  • B29C66/61—Joining from or joining on the inside
  • B29C66/612—Making circumferential joints
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C66/00—General aspects of processes or apparatus for joining preformed parts
  • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
  • B29C66/63—Internally supporting the article during joining
  • B29C66/632—Internally supporting the article during joining using a fluid
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C66/00—General aspects of processes or apparatus for joining preformed parts
  • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
  • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
  • B29C66/712—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined the composition of one of the parts to be joined being different from the composition of the other part
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B15/00—Layered products comprising a layer of metal
  • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B15/043—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B15/00—Layered products comprising a layer of metal
  • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
• • 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
• • 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
  • F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
  • F16L9/147—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and plastics with or without reinforcement

Definitions

• the invention relates to a method for producing a double-walled tube with an outer tube, which is pressed with an inner tube, which preferably consists of a corrosion-resistant alloy, wherein between the outer tube and the inner tube at least partially an adhesive is introduced.
• the invention also relates to such a double-walled pipe.
• a bimetallic tube which consists of a ferritic outer tube into which a made of a corrosion-resistant alloy, for. B. stainless steel, existing inner tube in hydroforming process is pressed.
• the essential feature in the manufacture of such tubes is a hydraulic three-dimensional expansion process of an inner tube in a seamless or welded outer tube at ambient temperature.
• the inner tube is initially elastic, then widened plastically between 2% and 5%, until it rests against the inner wall of the outer tube. Subsequently, a common expansion of the inner and outer tube takes place by about 0.5% to 1%, wherein the outer tube is held by a two-part outer tool.
• an adhesive is provided between the outer tube and the inner tube, to prevent the inner tube or liner from coming loose from the outer tube or wrinkling when rolled.
• the adhesive is preferably a permanently elastic adhesive that can absorb high tensile and shear forces.
• the adhesive may take the form of annular adhesive cuffs are applied and then evenly distributed over the lateral surface of the inner tube before it is inserted into the outer tube.
• the ends of the pipes should also be free of glue.
• the object of the present invention is to provide a method with which double-walled, reusable pipes can be easily produced.
• Another object of the invention is to provide an improved, double-walled, reuseable tube.
• the inventive method for producing a double-walled tube with an outer tube, which is pressed with a, preferably made of a corrosion-resistant alloy, inner tube, wherein between the outer tube and the inner tube at least partially an adhesive is introduced, provides that after the bonding of the inner tube with the outer tube, the inner tube and the adhesive layer is removed at the tube ends and under material connection to the inner tube, the inside of the outer tube is plated.
• the inner tube is pressed into the outer tube by expanding it from the inside, alternatively or additionally, the compression is achieved by compressing the outer tube or by reducing the inner diameter of the outer tube, for example by cooling or by reducing an internal pressure after a widening of the outer tube.
• the Sch locatedplatt Schlieren the pipe ends of the outer tube on the inside is a wear, oxidation and corrosion protection for the outer tube.
• the Sch is a wear, oxidation and corrosion protection for the outer tube.
• the different materials of the inner tube and the outer tube are firmly bonded together, wherein the material that is welded on the inside of the outer tube is higher alloyed than the material of the outer tube.
• the tube ends of the inner tube can be removed thermally and / or mechanically so as to gain access to the adhesive layer located in the region of the tube ends between the inner tube and the outer tube or access after removal of the tube ends of the inner tube To obtain the length over which the weld cladding is to be applied to the outer tube.
• the inner tube can be mechanically separated in the region of the tube end to be separated, for example by turning, milling or grinding or else by thermal treatment. ⁇
• abrasive or other abrasive separation processes are used in which the inner tube by physical and chemical principles of action in the form of electrical energy, thermal energy, chemical reactions and their combinations are used for separating.
• the tube ends can be completely removed thermally and / or mechanically, alternatively it is possible to remove only a slit or an annular part of the inner tube and then the separated part of the inner tube, which is held only by the adhesive layer, from the outer tube remove.
• the removal of the inner pipe section to be removed is carried out, for example, by applying tensile or compressive forces or by applying torsional forces in order to dissolve the adhesion via the adhesive.
• any remaining adhesive in the region of the tube ends on the inside of the outer tube can be removed thermally, chemically and / or mechanically, for example by heating, incineration, chemical dissolution or dissolution or conversion or by mechanical production methods. Also, an area between the inner tube and the outer tube may be freed from adhesive after an inner tube end has been removed, resulting in an adhesive-free gap between inner tube and outer tube.
• the surface of the inside of the outer tube may be chemically and / or mechanically processed prior to plating to ensure improved adhesion of the plated material to the outer tube.
• residues of adhesives and optionally the materials used to remove the adhesives are removed by machining the inside of the outer tube. The surface is thus _
• the inner tube is first glued in the production of the double-walled tube over the entire length, so that two substantially equal pipe sections of inner tube and outer tube yield a double-walled tube as an intermediate, the tubes over the entire length and advantageously also over the entire surface are glued together.
• the adhesive application is simplified, since inaccuracies in the guidance of the tubes during insertion of the inner tube into the outer tube are unproblematic, since no areas of the inner tube or the outer tube should be excluded from an adhesive application.
• the full-surface bonding of the inner tube to the outer tube ensures a reliable assignment of the inner tube to the outer tube and prevents the formation of wrinkles on the inner tube or liner during the reeling.
• the inner tube is advantageously made of a corrosion-resistant alloy, in particular of a chromium-nickel steel or a nickel-based alloy, wherein as the outer tube preferably a tube made of a carbon steel is used.
• the different steel grades are bonded together by means of welding cladding.
• the adhesive used is preferably a permanently elastic adhesive in order to be able to compensate for differences in the thermal expansion or possibly relative movements between the inner tube and the outer tube during loading and laying.
• the inner tube and / or the outer tube may be cooled during plating.
• weld plating which is advantageously carried out in a circumferential welding process in which the tube is rotated relative to the plated material or a welding torch or an electrode during the welding process, first the shortened inner tube is materially connected to the outer tube via the Sch Strukturplatt istsmaterial. Starting from this lying inside the outer tube area is "
• a local cooling which acts on the pipes from inside or outside, is advantageous.
• the cooling may begin before the beginning of the weld cladding. During the welding cladding can be cooled both inside and outside, also can be cooled only from one side. Aftercooling can also be done.
• the weld clad material forms a closed coating over the inside of the outer tube and covers the inside thereof, and the material used for plating is also corrosion resistant.
• the double-walled tube with an outer tube which is pressed with an inner tube, preferably the inner tube is pressed into the outer tube, wherein between the outer tube and the inner tube at least partially an adhesive is arranged, provides that at the tube ends of the outer tube, a Sch spatttechnik is applied, which connects the outer tube cohesively with the inner tube.
• the inner tube is thus shortened relative to the outer tube by the length of the Sch spaplatt réelle over which the inner tube is materially coupled to the outer tube, the Sch healthplatt réelle is preferably applied over the entire surface on the inside of the outer tube to protect the outer tube from mechanical and chemical influences ,
• the inner tube is preferably made of a corrosion-resistant alloy, in particular of a chromium-nickel steel or a nickel-based alloy, whereas the outer tube is preferably made of a carbon steel.
• the Sch spatt ist is preferably applied to a length of 50 mm to 250 mm from the pipe end on the outer tube to a sufficient length a purely metallic end face of the double-walled To provide tube so that two ends of opposing double-walled tubes can be welded together easily.
• the length of the weld cladding enables the pipe ends or the front sides to be mechanically preprocessed in order to enable a secure and automatable welding of pipe ends to a long pipe string.
• the Sch spatt ist preferably extends to the end of the outer tube, so that the inside of the outer tube is completely protected against corrosion, namely first by the Sch spattmaschine and then over the further course of the tube length through the inner tube or the liner.
• the inner diameter of the Sch spatt ist preferably corresponds to the inner diameter of the inner tube, thereby ensuring that no turbulence or flow obstacles in the double-walled tube occur and a double-walled tube with a nearly constant inner diameter can be provided even when welded together pipe ends.
• Figure 1 - a sectional view of a double-walled pipe end after bonding
• Figure 2 - a partial perspective sectional view of the pipe end of Figure 1;
• Figure 3 is a sectional view of a pipe end after removal of an inner pipe part and during the Sch spatt Schl.
• FIG. 4 is a perspective partial sectional view of FIG. 3.
• FIG. 1 shows a partial sectional view of one end of a double-walled one - ö -
• the outer tube 3 is made of a carbon steel and is substantially thicker than the inner tube 2, which is designed as a so-called liner and consists of a corrosion-resistant material, preferably of a chromium-nickel steel or a nickel-base alloy.
• the outside of the inner tube 2 or the inside of the outer tube 3 is provided over the entire length with the adhesive 4 over its entire surface.
• the inner tube 2, in the unassembled state, has an outer diameter which is smaller than the inner diameter of the outer tube 3.
• the inner tube 2 After insertion of the inner tube 2 into the outer tube 3, the inner tube 2 is mechanically, for example hydromechanically widened so that the outer side of the inner tube 2 comes into contact with the adhesive 4 and together at least slightly widen the outer tube 3.
• the inner tube 2 can be inserted into a flared outer tube 3, which is then reduced in its inner diameter, for example by relaxing, compressing the outer tube or cooling.
• the inner tube 2 rests evenly on the inside of the outer tube 3 and is positively coupled thereto via the adhesive layer 4.
• the assignment and fixing of the inner tube 2 takes place in the outer tube 3 via the mechanical clamping due to the different return paths of the inner tube 2 and the outer tube 3 due to the mechanical expansion or compression.
• the adhesive layer 4 is applied uniformly over the entire circumference of the inner tube 2 and the inner periphery of the outer tube 3, the adhesive layer 4 extends to the front side of the double-walled tube 1, the inner tube end 21 thus also connected to the outer tube end 31 via the adhesive layer 4. Based on this state, the further processing of the double-walled tube 1 is made.
• Figures 3 and 4 show a pipe end of a double-walled tube 1 am End of its completion.
• a portion of the inner tube end 21 has been removed, for example, by unscrewing, milling or grinding out the inner tube end 21.
• Alternative methods of removing the inner tube end 21 may include inserting a circumferential slot and withdrawing the severed tube end, optionally after removal or deactivation of the adhesive layer 4 in this area.
• the circumferential slot can be made by mechanical removal or separation processes or by thermal separation processes such as flame cutting, laser flame cutting or electrochemical or chemical processes. After removal of the inner tube end 21, any remaining adhesive layer 4 is completely removed. The removal may be carried out thermally, mechanically, chemically or in combination of several of these methods.
• the surface of the freed from the adhesive layer 4 inside of the outer tube end 31 is machined, for example, ground or polished.
• a Sch healthplatt ist 5 is applied via a welding torch 6 on the freed from the inner tube end 21 of the double-walled tube 1.
• the application of the weld cladding 5 can be carried out in a circulating application method, in which either the double-walled tube 2 or the welding torch 6 is rotated together with the weld metal to be applied.
• the Sch Strukturplatt réelle 5 extends to the tube end, ie to the front side of the outer tube 3 and connects the outer tube 3 cohesively with the inner tube 2.
• the adhesive layer 4 preferably extends until shortly before the Sch Strukturplatttechnik 5.
• the outer tube 3 and / or the inner tube 2 is cooled during the Sch Strukturplattmaschine, in particular locally cooled.
• the inner diameter of the Sch spaplatttechnik 5 corresponds to the inner diameter of the inner tube 2, the Sch relieplatttechnik 5 can still be machined after the deposition welding, so that a substantially smooth-walled surface of the Sch spatt réelle 5 is achieved.
• the outer tube end 31 is completely metallic after completion of the weld cladding 5, the weld cladding can be over a length of 50 ⁇

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Plasma & Fusion (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Materials Engineering (AREA)
• Optics & Photonics (AREA)
• Rigid Pipes And Flexible Pipes (AREA)
• Electroplating Methods And Accessories (AREA)
• Butt Welding And Welding Of Specific Article (AREA)

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• 2015
  • 2015-10-21 DE DE102015117871.0A patent/DE102015117871B4/de active Active
• 2016
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  • 2016-10-20 WO PCT/EP2016/075195 patent/WO2017068028A1/de active Application Filing
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  • 2016-10-20 BR BR112018006916-7A patent/BR112018006916B1/pt active IP Right Grant
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