Classifications

• • 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
  • B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
  • B23K33/004—Filling of continuous seams
  • B23K33/006—Filling of continuous seams for cylindrical workpieces
• • 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
  • B21C37/08—Making tubes with welded or soldered seams
  • B21C37/0803—Making tubes with welded or soldered seams the tubes having a special shape, e.g. polygonal tubes
• • 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
  • B21C37/08—Making tubes with welded or soldered seams
  • B21C37/09—Making tubes with welded or soldered seams of coated strip material ; 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
  • B23K26/20—Bonding
  • B23K26/21—Bonding by welding
  • B23K26/24—Seam welding
  • B23K26/26—Seam welding of rectilinear seams
• • 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
• • 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
  • B23K2101/34—Coated articles, e.g. plated or painted; Surface treated 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
  • 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
  • B23K2103/08—Non-ferrous metals or alloys

Definitions

• thin-walled square pipes have become more and more used in e.g. frames for buil ⁇ dings, furniture and automobiles.
• the pipes can be either square or more or less rectangular in cross-section.
• Thin-walled pipes are defined as pipes with wall thick- nesses up to 3 - t mm. Common lengths of course vary within wide limits, but regarding storing, transport and waste of course long initial pipes are preferred.
• the coating consists of metals as e.g. zinc, aluminum, nickel or copper or blendings of these, or industrially painted surfaces.
• industrially painted surfaces is usually ment surfaces coated by e.g. PVC-plastics, polyester or acrylate.
• the coating on the outside of the pipes natural ⁇ ly can be repaired with a result which is more or less acceptable. But the reparation is devastating for the economy.
• Another point of view of the manufacturing of square pipes is that from a storing and economical point of view it is desirable to start with a steel strip with a desired width, thickness and coating by slitting from wider plate rolls with a thickness and a coating corre ⁇ sponding to the finished pipe and after that subsequently shape and join the pipe and cut it into desired lengths an d even carry out some after-treatment.
• square pipes can be continuously manufactured from steel strips, e.g. slitted from wide coils with a desired thickness and a completely treated surface by broadening the surfaces of the joint, having engaging coatings to melt together af ⁇ ter a quick heating by help of a laser heater and on the same time providing the pipe with such stresses that a durable joint is reached and where the coating in the area of the joint keeps its protecting and visible effect without considerable affection.
• figure 1 shows a square pipe in a perspective projection
• figure 2 a cross-section of the continuously manufactured pipe section at the moment in which the laser heating is started.
• a start is made from a steel strip with a thickness equal to the thickness of the finished pipe 1.
• the width is equal to the periphery of the pipe 1 , to which an addition is made for the two foldings 5 (see below).
• the strip is bent in a continuous roller shaping path constituted by a number of facing roller couples arranged in groups after each other making the strip symmetrically shaped into a determined cross-section of the pipe 1.
• a determined profile 6 is shaped.
• the width of the bottom part 7 of the pro ⁇ file 6 is made equal to the bottom 2 of the pipe 1 , the side parts 8 of the profile 6 equal to the sides 3 of the pipe 1 and the top parts 9 of the profile 6 equal to half the width of the bottom 2 of the pipe 1.
• the angles 11 of the bottom of the profile 6, i.e. the angles between the bottom part 7 of the profile 6 and the side parts 8, are made acute down to 70° and the angles 12 of the top parts of the profile 6, i.e. the angles between the side parts 8 of the profile 6 and top parts 9, are made obtuse and mainly as much over 90° as the bottom angles 11 are below 90 .
• the lower edges 10 of the foldings 5 have to contact each other.
• the foldings 5 ends the top parts 9 of the profile 6 and are bended in a right angle (90°) from the same.
• the width of the foldings 5 is adjusted making a sufficiant jointing surface at melting of the two coatings of their each other facing, coated surfaces 13.
• said coated surfaces 13 are heated into melting or at least into a plastic consistency by help of a laser beam directed to the foldings 5.
• the heating is very quickly made and the heating can be concentrated to exactly the areas which are to be heated.
• the shaping of the profile 6 into a square pipe 1 is carried on in the roller shaping device.
• This shaping mainly is to change the obtuse angles 12 of the upper parts of the profile 6 into right angles by de ⁇ pressing the upper parts 9 of the profile 6 to the center of the pipe and with an over-bending of the angles 12 of the upper parts of the profile 6 in a way that these af ⁇ ter springing back become right. If the method is unifor ⁇ med controlled the bottom angles 11 of the profile 6 also will be 90°. But at this method no over-bending is made of these angles but a certain spring back force is rea ⁇ ched striving to press the melted surfaces of the fol ⁇ dings 5 together, which strengthens the jointing force of the joint ⁇ . This is especially useful if the square pipe 1 is subjected to such bending stresses where ten- sile forces arise in the upper side of the jointed square pipe 1.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• Plasma & Fusion (AREA)
• Shaping Of Tube Ends By Bending Or Straightening (AREA)
• Coating With Molten Metal (AREA)
• Laminated Bodies (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Attitude Control For Articles On Conveyors (AREA)
• Rigid Pipes And Flexible Pipes (AREA)
• Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
• Metal Extraction Processes (AREA)
• Lining Or Joining Of Plastics Or The Like (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

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Family Applications (1)

Country Status (7)

Cited By (5)

Families Citing this family (3)

• 1989
  • 1989-01-03 SE SE8900014A patent/SE462787B/sv not_active IP Right Cessation
• 1990
  • 1990-01-02 CA CA002045127A patent/CA2045127A1/en not_active Abandoned
  • 1990-01-02 DE DE90901698T patent/DE69002760T2/de not_active Expired - Fee Related
  • 1990-01-02 WO PCT/SE1990/000001 patent/WO1990007392A1/en active IP Right Grant
  • 1990-01-02 EP EP90901698A patent/EP0459988B1/en not_active Expired - Lifetime
  • 1990-01-02 DK DK90901698.2T patent/DK0459988T3/da active
  • 1990-01-02 AT AT90901698T patent/ATE92800T1/de not_active IP Right Cessation

Non-Patent Citations (3)

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