WO1999054126A1 - Soudure longitudinale oblique - Google Patents

Soudure longitudinale oblique Download PDF

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Publication number
WO1999054126A1
WO1999054126A1 PCT/US1999/008411 US9908411W WO9954126A1 WO 1999054126 A1 WO1999054126 A1 WO 1999054126A1 US 9908411 W US9908411 W US 9908411W WO 9954126 A1 WO9954126 A1 WO 9954126A1
Authority
WO
WIPO (PCT)
Prior art keywords
planar surface
weld
longitudinal
angle
edge
Prior art date
Application number
PCT/US1999/008411
Other languages
English (en)
Inventor
Robert E. Stagg
Original Assignee
Stagg Robert E
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Stagg Robert E filed Critical Stagg Robert E
Priority to AU36492/99A priority Critical patent/AU3649299A/en
Publication of WO1999054126A1 publication Critical patent/WO1999054126A1/fr

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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
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/0826—Preparing the edges of the metal sheet with the aim of having some effect on the weld
    • 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
    • F16L9/16—Rigid pipes wound from sheets or strips, with or without reinforcement
    • F16L9/165—Rigid pipes wound from sheets or strips, with or without reinforcement of metal

Definitions

  • This invention relates to manufacturing of tubes and pipe, and more particularly relates to means for manufacturing tubes and pipe using a bias longitudinal weld.
  • welds generally have a dual nature — passive and active.
  • the passive nature of a weld is to permanently bond two metallic members together into a reconfigured joinder.
  • the active or dynamic nature of a weld is its ability to withstand a diversity of conditions of forces and related pressures.
  • most properly executed welds produce a joinder of metals or alloys that has superior tensile strength than either of the welded members.
  • Simultaneously, however, such a joinder typically has an inferior shear strength.
  • welds typically are stronger than either of the welded members regarding withstanding the effect of longitudinal forces, but are weaker regarding withstanding the effect of perpendicular forces.
  • welds are generated by a diversity of processes which cause local coalescence of metallic members over a wide range of pressure and temperature conditions.
  • traditional welds are generated by welding processes including tungsten inert gas (“TIG”) welding, prevalent for light-metal gages and for high-precision bonding; metal insert gas (“MIG”); plasma welding; and electric resistance welding ( ⁇ RW).
  • TOG tungsten inert gas
  • MIG metal insert gas
  • ⁇ RW electric resistance welding
  • Sakamoto et al. disclose a method and apparatus for promoting the formation of high quality welds during conventional straight or vertical laser welding of two jointing members using a filler wire which is applied to the locally heated portion of each jointed member.
  • the difference between the welding plasma intensities measured from both sides of the locally heated portion is minimized and kept below a predetermined value, by correcting the relative position between the filler wire and the local heat supply.
  • U.S. Patent No. 5,399,834 discloses a method and device for butt welding metal sheets using a laser beam while lateral pressure is applied towards the plane adjoining the flat sheets.
  • this is an alternative means for conventional strip joining methods such as flash welding and dual bias welding, which is taught by the instant inventor 3 in U.S. Patent No. 5,456,405.
  • Guth teaches that, for effectively joining by butt welding at least two metal sheets of different thicknesses, wherein the mechanical strength of the joinder is optimized, the shape of the joint is improved if a laser beam forms an acute angle in a prescribed degree-range with respect to a vertical axis passing through the focal point of the laser beam.
  • U.S. Patent No. 5,456,405 teaches a technique of butt welding metal strips by forming a bias seam at the joinder.
  • the present invention provides an improved weld for joining edges of metallic sheets or skelp to be formed into tube, pipe, and the like. More particularly, the present invention provides a bias longitudinal weld that enables joining edges of metal skelp in a manner heretofore unknown in the art.
  • the weld bias structure disclosed inherently removes the HAZ weld region from shear stresses, thereby minimizing any mechanical property differences between the welded joint and the member metals comprising the pipe or tube walls.
  • the present invention teaches a weld with performance that effectively approaches the performance of seamless pipes and tubes.
  • a longitudinal bias weld that enables closure of metal skelp to form essentially seamless pipes, tubes, and the like having surprisingly enhanced capacity to withstand both tensile and shear stress at the joints.
  • An edge plane disposed on each side of metal skelp forms acute angle with respect to bottom longitudinal surface of the sheet and correspondingly forms an obtuse angle with respect to top longitudinal surface of the 5 skelp.
  • the opposite edge plane forms an obtuse angle with respect to bottom longitudinal surface of the skelp and correspondingly forms an acute angle with respect to top longitudinal surface.
  • bias longitudinal weld for forming pipe from a continuous coil of flat metal skelp having: a longitudinal axis, a first longitudinal planar surface, a second longitudinal planar surface disposed oppositely of and parallel to said first longitudinal planar surface, a first edge planar surface disposed between said first planar surface and said second planar surface, and a second edge planar surface disposed between said first planar surface and said second planar surface, and disposed oppositely of and parallel to said first end planar surface
  • said bias longitudinal weld comprising: a first angle formed by said first edge planar surface and said second longitudinal planar surface; a second angle formed by said first edge planar surface and said first longitudinal planar surface, a third angle formed by said second edge planar surface and said second longitudinal planar surface; a fourth angle formed by said second edge planar surface and said first longitudinal planar surface, a permanent joinder of said first edge planar surface and said second edge planar surface when said first edge planar surface and said second edge plan
  • bias longitudinal weld for forming pipe from a continuous coil of flat metal skelp having: a longitudinal axis, a first longitudinal planar surface, a second longitudinal planar surface disposed oppositely of and parallel to 7 said first longitudinal planar surface, a first edge planar surface disposed between said first planar surface and said second planar surface, and a second edge planar surface disposed between said first planar surface and said second planar surface, and disposed oppositely of and parallel to said first end planar surface
  • said bias longitudinal weld comprising: a first acute angle formed by said first edge planar surface and said second longitudinal planar surface; a first obtuse angle formed by said first edge planar surface and said first longitudinal planar surface, a second acute angle formed by said second edge planar surface and said second longitudinal planar surface; a second obtuse angle formed by said second edge planar surface and said first longitudinal planar surface, a permanent joinder of said first edge planar surface and said second edge planar surface
  • FIG. 1 depicts a frontal perspective view of a flat metal coil or skelp prior to being formed into welded tubing known in the prior art.
  • FIG. 2 depicts a frontal perspective view of a flat metal coil or skelp prior to being formed into welded tubing embodying the present invention.
  • FIG. 3 depicts a cross sectional frontal view of a portion of the metal skelp depicted in FIG. 1.
  • FIG. 4 depicts a cross sectional frontal view of a portion of the metal skelp depicted in FIG. 2.
  • FIG. 5 depicts a frontal perspective view of the formation of a longitudinally welded tubing constructed from the metal skelp depicted 8 in FIGS. 1 and 3, prior to seam -welding as known in the art,.
  • FIG. 6 depicts a frontal perspective view of the formation of a bias longitudinally welded tubing constructed from the metal skelp depicted in FIGS. 2 and 4, prior to seam-welding embodying the present invention.
  • FIG. 7 depicts a cross sectional end view of the metal pipe formed as depicted in FIG. 5.
  • FIG. 8 depicts a cross sectional end view of the metal pipe depicted in FIG. 6.
  • FIG. 9 depicts a simplified schematic of a pipe formed with a conventional weld subjected to shear stresses.
  • FIG. 10 depicts a simplified schematic of a pipe formed with a bias longitudinal weld taught by the present invention, subjected to shear stresses.
  • FIG. 11 depicts a simplified schematic of a pipe formed with a conventional weld subjected to x-ray inspection.
  • FIG. 12 depicts a simplified schematic of a pipe formed with a bias longitudinal weld taught by the present invention, subjected to x- ray inspection.
  • FIG. 13 depicts a simplified schematic of a pipe formed with a conventional weld subjected to ultrasonic inspection.
  • FIG. 14 depicts a simplified schematic of a pipe formed with a bias longitudinal weld taught by the present invention, subjected to ultrasonic inspection.
  • FIGS. 2, 4, 6, and 8 there are depicted frontal perspective, cross- sectional, and frontal views of formation of a preferred embodiment of bias longitudinal weld 50 constructed from coiled flat metal skelp 10 as contemplated by the present invention. More particularly, FIG. 6 depicts a frontal perspective view of a flat portion of metal skelp 10 to be formed into pipe 100 with bias longitudinal weld 50.
  • This portion of metal sheet 10 comprises top planar surface 20, longitudinal edge planar surfaces 30 and 35, respectively, and transverse or end planar surfaces 40 and 45 (not shown), respectively. Also shown is top and bottom planar surfaces 20 and 25, respectively, and longitudinal edges 30 and 35.
  • Pipe 100 comprises interior surface 110 and exterior surface 105 formed by bias longitudinal weld 50 joining edges 30 and 35 hereinbefore described.
  • Planar surface 30 of a side of metal skelp 10 is defined by line LI disposed along top longitudinal surface 20 being offset to line L2 disposed along bottom longitudinal surface 25.
  • Edge plane 30 forms acute angle ⁇ with respect to bottom longitudinal surface 25 and correspondingly forms obtuse angle ⁇ with respect to top longitudinal surface 20.
  • planar surface 35 of opposite side of metal skelp 10 is defined by line L3 disposed along top longitudinal surface 20 being offset to line L4 disposed along bottom longitudinal surface 25.
  • Edge plane 35 forms 10 obtuse angle ⁇ with respect to bottom longitudinal surface 25 and correspondingly forms acute angle ⁇ with respect to top longitudinal surface 20.
  • planar sides 20 and 25 form a biased line comprising longitudinal welded seam 50.
  • angles ⁇ and ⁇ are supplementary to each other. It should be appreciated by those skilled in the art that the weld taught by the present invention inherently assures that maximum weld is emplaced along the longitudinal joinder thereby establishing a stronger joinder than has been heretofore known in the art.
  • FIGS. 9 and 10 there is depicted how the preferred embodiment of the present invention tends to mitigate the adverse characteristics of the heat affected zone (HAZ) that is a routine by-product of the welding process.
  • FIG. 9 depicts the HAZ associated with conventional weld 6 wherein the HAZ is disposed symmetrically and circumferentially on each side of weld 6.
  • FIG. 10 depicts how the bias longitudinal weld taught by the present invention tends to ameliorate the resistance to shear stresses at the juncture of the HAZ and the weld. Since weld 11
  • shear stresses are engendered in pressurized pipelines and the like by load thrust perpendicularly against the walls of the pipe, such stresses are minimized because the force is not perpendicular to either weld 50 or the HAZ, and is uniformly distributed across both the weld and the HAZ.
  • the reduction in shear stress effectuated by the weld of the present invention may be seen by considering the basic formula for stress, i.e., pressure:
  • weld of the present invention emulates seamless pipes and the like in
  • FIGS. 13 and 14 schematically comparatively depict
  • FIG. 13 As is known to those skilled in the art,
  • ultrasonic signal tests the integrity of the entire profile across the bias.
  • Tube mill equipment and roll manufacturers typically have
  • skelp or sheet should be finished to the combination of acute and
  • the resultant profile is determined by the combination or cumulation
  • the commonly used weld box is a rollered containment point
  • seam produced by weld fusion is formed by forcing the heated edges
  • O.D. weld flash and "LD. weld 17 flash,” to be forced both outwardly and inwardly of the pipe wall.
  • present invention is produced having the intended shape and having
  • weld of the present invention is formed, the newly produced, post-
  • scarfed pipe may be passed through a re-heat process
  • bias longitudinal weld of the present invention is formed via a laser
  • the HAZ is substantially narrower than for 18 fusion welding and the like. Accordingly, it would be advantageous to
  • Inclined mills should preferably have
  • tramp byproducts e.g., mill scale, grease, and oil
  • weld flash especially LD. weld flash.
  • the core impedance 19 structure of tooling limits the internal space required for such removal.
  • tubing i.e., lengths of pipe on the order of 20 feet or less.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)

Abstract

L'invention concerne une soudure longitudinale oblique permettant de constituer des tuyaux et des tubes à partir de feuillards (10) à tubes. Une surface plane de bordure, de chaque côté (30, 35) du feuillard (10), forme un angle aigu avec la surface longitudinale inférieure (25) du feuillard (10), et forme donc un angle obtus avec la surface longitudinale supérieure (20) du feuillard (10). La surface plane de bordure opposée forme un angle obtus avec la surface longitudinale inférieure (25) du feuillard, et forme donc un angle aigu avec la surface longitudinale supérieure (20) du feuillard. Lorsqu'un tuyau (100) est fabriqué à partir du feuillard (10), les surfaces planes (30, 35) de bordure viennent former une soudure longitudinale oblique (50).
PCT/US1999/008411 1998-04-20 1999-04-16 Soudure longitudinale oblique WO1999054126A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU36492/99A AU3649299A (en) 1998-04-20 1999-04-16 Bias longitudinal weld

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US6288898A 1998-04-20 1998-04-20
US09/062,888 1998-04-20

Publications (1)

Publication Number Publication Date
WO1999054126A1 true WO1999054126A1 (fr) 1999-10-28

Family

ID=22045501

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/008411 WO1999054126A1 (fr) 1998-04-20 1999-04-16 Soudure longitudinale oblique

Country Status (2)

Country Link
AU (1) AU3649299A (fr)
WO (1) WO1999054126A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2255472A (en) * 1938-02-28 1941-09-09 Bundy Tubing Co Tube and method of making tube
US2380107A (en) * 1941-05-02 1945-07-10 Bundy Tubing Co Tubing
US2706328A (en) * 1950-11-21 1955-04-19 Karmazin John Method and blank for making tubing
US2884958A (en) * 1956-05-18 1959-05-05 Sr Leonard J Asselin Rolled tube
US3434503A (en) * 1966-10-12 1969-03-25 Bundy Corp Method of making tubing and product thereof
US4741470A (en) * 1983-05-24 1988-05-03 Olin Corporation Method for assembling an optical fiber communication cable
US5456405A (en) * 1993-12-03 1995-10-10 Quality Tubing Inc. Dual bias weld for continuous coiled tubing

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2255472A (en) * 1938-02-28 1941-09-09 Bundy Tubing Co Tube and method of making tube
US2380107A (en) * 1941-05-02 1945-07-10 Bundy Tubing Co Tubing
US2706328A (en) * 1950-11-21 1955-04-19 Karmazin John Method and blank for making tubing
US2884958A (en) * 1956-05-18 1959-05-05 Sr Leonard J Asselin Rolled tube
US3434503A (en) * 1966-10-12 1969-03-25 Bundy Corp Method of making tubing and product thereof
US4741470A (en) * 1983-05-24 1988-05-03 Olin Corporation Method for assembling an optical fiber communication cable
US5456405A (en) * 1993-12-03 1995-10-10 Quality Tubing Inc. Dual bias weld for continuous coiled tubing

Also Published As

Publication number Publication date
AU3649299A (en) 1999-11-08

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