Methods Patents (Class 219/61)
  • Patent number: 4278868
    Abstract: Methods and apparatus for the welding and heat treating of metal parts in which an electric arc extends between a pair of adjacent metal parts or between an electrode and one or more metal parts with the arc traversing the metal part or parts a plurality of times during the heating cycle. For finite length metal parts, i.e. when the surface or surfaces to be heated do not provide closed paths to be followed by the arc, the arc is initiated, caused to follow the surface, extinguished and then reinitiated, or is caused to traverse the surfaces in alternately opposite directions after initiation. With finite length metal parts, run-off tabs are provided at the ends of the surfaces to prevent overheating at such ends. A magnetic field causes the arc to traverse the surfaces and may be modified in strength or distribution to vary traverse rate.
    Type: Grant
    Filed: October 19, 1979
    Date of Patent: July 14, 1981
    Assignee: Thermatool Corp.
    Inventors: Wallace C. Rudd, Humfrey N. Udall
  • Patent number: 4258242
    Abstract: Disclosed herein is an improvement of a welding process for welding a steel pipe, wherein a gas metal arc welding is performed to form the first welding layer and a submerged arc welding is performed to form the last welding layer. According to the conventional gas metal arc welding process, i.e. the MIG or CO.sub.2 welding processes, the combined use of a high welding current and a welding wire having a small diameter is known to bring about the rotation of the welding arc and the formation of an undercut along the toe of the weld metal. The purpose of the present invention is to weld a steel pipe having either a large thickness or an excellent ductility at a temperature of less than -40.degree. C., or both. According to the present invention, the combined use of a high welding current and a wire having a small diameter is possible, by employing a gas mixture containing an inert gas as a major part thereof and CO.sub.2 as an additional part thereof as a shielding gas.
    Type: Grant
    Filed: September 11, 1978
    Date of Patent: March 24, 1981
    Inventors: Shigeo Fujimori, Tohru Saito, Kozaburo Otani, Taizi Nagatani
  • Patent number: 4255641
    Abstract: The specification discloses a method and apparatus for assuring the integrity of outside weldings of pipelines. Pipe sections are prepared for welding by forming a beveled profile with a relatively narrow annular contact band on the ends of each pipe section. When the pipe sections are abutted end to end for welding, the leveled profiles form a relatively deep groove on the outside of the pipe between the pipe sections, with the annular contact bands abutting and spaced inwardly from the grooves. The contact band on at least one of the pipe sections is circumferentially prepared such as by knurling to provide controlled spacing between the contact bands of the pipe sections. A welding arc is applied to the bottom of the groove from the exterior of the pipe sections to weld the annular contact bands together. Welding penetration is enhanced by the circumferential preparation of the contact bands.
    Type: Grant
    Filed: May 8, 1978
    Date of Patent: March 10, 1981
    Assignee: Crutcher Resources Corporation
    Inventors: Talbert D. Connell, Eugene F. Sims
  • Patent number: 4238659
    Abstract: In longitudinally seam-welding a pipe-blank for welded steel pipe from the inside along a groove by the GMA welding process which comprises using direct electric current supplied to a plurality of consumable electrodes in tandem through at least one cable as the welding current, at least two even-numbered consumable electrodes are used, half of said consumable electrodes being connected to said direct current so as to be positive in polarity and the remaining half of said consumable electrodes being connected to said direct current so as to be negative in polarity, to enable lines of magnetic force produced by said direct electric current for welding flowing through said at least one cable introduced into said pipe-blank to cancel each other, thereby preventing magnetization of said pipe-blank and the resulting magnetic arc blow of the welding arc.
    Type: Grant
    Filed: February 12, 1979
    Date of Patent: December 9, 1980
    Assignee: Nippon Kokan Kabushiki Kaisha
    Inventors: Fusao Koshiga, Jinkichi Tanaka, Itaru Watanabe, Motoaki Suzuki, Toshifumi Kojima, Hiroyoshi Matsubara, Tatsumi Osuka, Kenji Takeshige, Takashi Nagamine, Osamu Hirano
  • Patent number: 4219717
    Abstract: A method of connecting metallic parts, and metallic parts so produced, by means of arc fusion welding by producing a low volume welding seam (narrow gap welding), wherein the workpiece parts to be jointed and forming a narrow gap are initially welded at their butt joint by means of, for instance, electron-beam welding, plasma-arc welding, laser-beam welding or argon arc-welding to produce a base seam with or without filler material, and thereafter the workpiece flanks forming the narrow gap are united by alternately depositing weld beads at first one and the other workpiece flank by submerged-arc welding.
    Type: Grant
    Filed: June 22, 1977
    Date of Patent: August 26, 1980
    Assignee: BBC Brown, Boveri & Company Limited
    Inventor: Gottfried Kuhnen
  • Patent number: 4219722
    Abstract: Methods and apparatus for the welding and heat treating of metal parts in which an electric arc extends between a pair of adjacent metal parts or between an electrode and one or more metal parts with the arc traversing the metal part or parts a plurality of times during the heating cycle. For finite length metal parts, i.e. when the surface or surfaces to be heated do not provide closed paths to be followed by the arc, the arc is initiated, caused to follow the surface, extinguished and then reinitiated, or is caused to traverse the surfaces in alternately opposite directions after initiation. With finite length metal parts, run-off tabs are provided at the ends of the surfaces to prevent overheating at such ends. A magnetic field causes the arc to traverse the surfaces and may be modified in strength or distribution to vary traverse rate.
    Type: Grant
    Filed: December 19, 1977
    Date of Patent: August 26, 1980
    Assignee: Thermatool Corp.
    Inventors: Wallace C. Rudd, Humfrey N. Udall
  • Patent number: 4213024
    Abstract: A method for butt welding pipe sections together wherein each pipe section has a beveled end includes positioning the pipe sections adjacent one another so that the beveled ends define a weld groove and locating filler material of elongate dimension having a triangular cross-section so that an edge portion thereof protrudes through the weld groove. The filler material is fused to the weld groove by striking an inert gas-shielded arc between a Heliarc torch electrode and the beveled ends and advancing the electrode relative to the filler material so that a weld bead is formed having a convex profile on the interior surfaces of the pipe sections adjacent the weld groove.
    Type: Grant
    Filed: August 4, 1978
    Date of Patent: July 15, 1980
    Assignee: JDC Welding and Research, Inc.
    Inventor: Eugene J. Costley
  • Patent number: 4196334
    Abstract: A method for assembling successive ducts end to end with a pipe-line constituted by the assembled ducts comprising: providing inner equipments for said ducts each comprising means for vacuum-tight connection with the inside of a duct and means protruding from the duct for vacuum tight connection with the pipe-line; placing said inner equipments in each successive duct in an equipping station, connecting said equipment to the inside of the duct at both ends to close an inner vacuum tight space inside the duct; connecting said space to pumping means and evacuating said inner space by said pumping means while transferring said duct and inner equipment from said equipping station to a welding station; positioning said duct in alignment and abutment end to end with the pipe-line in said welding station; locking the duct in fixed position with respect to the pipe-line, sealingly connecting said equipment with the pipe-line inside the pipe-line, and sealingly connecting a vacuum tight welding chamber of a rotative w
    Type: Grant
    Filed: April 24, 1978
    Date of Patent: April 1, 1980
    Inventor: Paul Thome
  • Patent number: 4182950
    Abstract: A weld joint configuration facilitating the connection of two closely positioned workpieces having spaced apart end surfaces comprising sidewalls of a weld joint space. One of said workpieces has a tongue projecting therefrom that is received at least in part in a groove formed in the other of the workpieces. The interface between the tongue and a surface of the other workpiece partially defining the groove comprises a weld joint parting line. An extension projecting from at least one of the workpieces provides workpiece material located between this parting line and the weld joint space. When the workpieces are welded electrode material and the extensions are mixed to form a composite weld having a root portion with a parting line extending substantially tangentially from the root portion.
    Type: Grant
    Filed: January 12, 1978
    Date of Patent: January 8, 1980
    Inventor: Lawrence A. Boros
  • Patent number: 4178022
    Abstract: Tapered stainless steel spool pieces are welded to the ends of stainless steel pipe lengths at the factory to provide subassemblies which are then annealed and thereafter in the field are positioned with the larger free ends of opposed spool pieces disposed to receive weld metal uniting the subassemblies while coolant liquid is maintained in contact with the inside surfaces of the spool pieces.
    Type: Grant
    Filed: July 12, 1977
    Date of Patent: December 11, 1979
    Assignee: General Electric Company
    Inventor: Rodney E. Hanneman
  • Patent number: 4158124
    Abstract: An apparatus for welding the adjoining ends of annular work members, such as lengths of pipe, employing an arc nozzle for melting and depositing metal in the gap between said adjoining ends. A drive motor coupled to the nozzle drives the nozzle laterally back and forth across the gap while the current that flows in said arc is integrated to generate a physical representation of magnitude of the integral. Means are provided to arrest the motor each time the magnitude reaches a predetermined threshold value, and to reverse the direction of travel of the motor.
    Type: Grant
    Filed: November 21, 1977
    Date of Patent: June 12, 1979
    Assignee: Crutcher Resources Corporation
    Inventor: Talbert D. Connell
  • Patent number: 4145594
    Abstract: In longitudinally seam-welding a pipe-blank for welded steel pipe from the inside along a groove by the metal arc welding process which comprises using direct electric current supplied to a plurality of consumable electrodes in tandem through at least one current supply cable as the welding current, an even number of consumable electrodes are used; half of said even-numbered consumable electrodes are connected in the reverse-polarity manner, i.e., to be positive in polarity, and are used as leading electrodes, and the remaining half are connected in the straight-polarity manner, i.e.
    Type: Grant
    Filed: May 24, 1977
    Date of Patent: March 20, 1979
    Assignee: Nippon Kokan Kabushiki Kaisha
    Inventors: Fusao Koshiga, Jinkichi Tanaka, Itaru Watanabe, Motoaki Suzuki, Toshihiro Takamura
  • Patent number: 4142085
    Abstract: A method for butt welding a pair of vertically disposed tubular members having a wall thickness of more than 12 mm in end-to-end relationship by multi-pass shielded arc welding with a consumable electrode, comprising the steps of preparing the opposed edges of the tubular members by forming a root face the width of which being in the range of 0.5 mm to 3.0 mm and beveling the edges adjacent to the root face to a bevel angle in the range of 40.degree. to 50.degree., coaxially aligning said tubular members so that the gap between the root faces is not larger than 1.5 mm, performing a root pass by continuously feeding an electrode having a diameter not larger than about 1.
    Type: Grant
    Filed: January 27, 1977
    Date of Patent: February 27, 1979
    Assignee: Elektriska Svetsningsaktiebolaget
    Inventors: Karl-Erik Knipstrom, Anders L. Malm, Bror H. Andersson
  • Patent number: 4107503
    Abstract: After longitudinally seam-welding a pipe-blank for welded steel pipe from the inside along a groove by the arc welding process which comprises using direct electric current supplied to a consumable electrode through a cable as the welding current, the polarity of said consumable electrode applied for said longitudinal seam-welding is switched over to the opposite polarity, an arc from said consumable electrode is ignited again on a tab plate attached to the end of said pipe-blank on the completion side of said longitudinal seam-welding to cause a direct electric current for eliminating magnetism to flow through said cable in the opposite direction to that of said direct electric current for welding, thereby eliminating residual magnetism in said pipe-blank produced by said direct electric current for welding flowing through said cable introduced into said pipe-blank during said longitudinal seam-welding.
    Type: Grant
    Filed: March 10, 1977
    Date of Patent: August 15, 1978
    Assignee: Nippon Kokan Kabushiki Kaisha
    Inventors: Fusao Koshiga, Jinkichi Tanaka, Itaru Watanabe, Motoaki Suzuki, Toshifumi Kojima, Hiroyoshi Matsubara, Tatsumi Osuka, Kenji Takeshige, Takashi Nagamine, Osamu Hirano
  • Patent number: 4095077
    Abstract: A method and apparatus for preheating filler material to a temperature approaching its melting point prior to deposit within a weld zone. The weld zone and deposited filler material are then heated sufficiently to form an integral weldment. The power imparted to preheat the filler material is automatically, programmably, controlled as a predetermined function of the filler material deposition rate to obtain smooth melting of the filler material within the weld zone at any given filler material feed speed.In an application to welding an extended seam along a workpiece wherein the weld zone is moved along the seam, the power employed to heat the weld zone and the filler material feed speed are additionally controlled as a function of the speed of movement of the weld zone along the seam.
    Type: Grant
    Filed: June 25, 1976
    Date of Patent: June 13, 1978
    Assignee: Westinghouse Electric Corp.
    Inventors: Urban A. Schneider, Robert D. Sigman
  • Patent number: 4082935
    Abstract: Wheel rim blank manufacturing apparatus comprises an elongated mandrel passing through Coiling, Welding and Machining Stations. Flat stock is fed transversely for coiling to cylindrical rim blanks about the mandrel. A transfer slide advances and maintains orientation of coiled rim blanks from the Coiling Station to the Welding Station. At the Welding Station clamps secure the blanks for resistance or high frequency current penetration welding. Internal clamps at the Welding Station have small shoulders for transferring the blanks past a Machining Station where a scarfing tool engages their welded areas. The method includes feeding stock transversely, coiling about a mandrel, advancing blanks along the mandrel, welding, again advancing the blanks, and machining weld areas.
    Type: Grant
    Filed: July 19, 1976
    Date of Patent: April 4, 1978
    Assignee: Torin Corporation
    Inventors: Bernard P. Lampietti, Erman V. Cavagnero
  • Patent number: 4081651
    Abstract: Apparatus is disclosed for supporting and rotating a pair of hollow tank sections of generally circular cross section, including scalene frusto-conical tank sections, during welding of the sections in end-to-end abutting relation to form an elongted tank. The apparatus includes three longitudinally spaced, axially aligned, rotatable rings which define a welding cage. The center ring includes a plurality of circumferentially spaced, radially directed jacks, each extendible the same distance regardless of the resistance encountered by a particular jack to force the abutting edges of the tank sections into a precise circular cross section and support and hold the abutting edges in aligned relation during rotation and welding.
    Type: Grant
    Filed: May 6, 1976
    Date of Patent: March 28, 1978
    Assignee: ACF Industries, Incorporated
    Inventors: Robert W. Randolph, Steven L. Jantzen
  • Patent number: 4074106
    Abstract: In a method for the manufacture of substantially cylindrical pressurized or liquefied gas tanks first and second portions deformable to open-ended cylindrical shape are stamped out of a same metal sheet, the cylindrical portions then being welded together by their free edges which mated in the sheet. A machine for automatically carrying out the method comprises means for stamping, shaping and assembling the portions.
    Type: Grant
    Filed: December 31, 1975
    Date of Patent: February 14, 1978
    Assignee: Roger Pelleray
    Inventor: Paul Nee
  • Patent number: 4066861
    Abstract: A method of welding a pipe to a pipe plate conprises slipping a ring over the pipe, the adjoining surfaces of the ring being in contact with the pipe surface and with the pipe plate surface over the entire circumference, inserting the pipe end over a short distance into a bore in the pipe plate, rolling the end of the pipe against the bore wall whereby a clamping contact between the pipe end and the bore wall is achieved and welding the pipe end to the pipe plate with the aid of a nonconsumable electrode under conditions that only a portion of the cross section of the ring melts. It is preferable, after welding the end of the pipe within the interior of the bore to melt completely the ring and to achieve a second weld joint. In this last step, one or more circular welds between the pipe end and the inner surface of the bore are made.
    Type: Grant
    Filed: January 19, 1976
    Date of Patent: January 3, 1978
    Assignee: B.V. Koninklijke Maatschappij "De Schelde"
    Inventor: Johannus Jacobus Broodman
  • Patent number: 4063062
    Abstract: In the preparation of plane or curved workpieces for welding together by means of an electron beam and wherein the weld takes the form of a full penetration joint, fusion lips are provided at the place where the lower welding bead forms. In the case where the workpieces are constituted by rotationally symmetrical thick-walled hollow bodies such as rotor discs for construction of turbo-machines which upon welding together form a closed cavity, the fusion lips have an annular configuration and are located at the inner radial contour of the welding interface. The workpieces are also provided with an arrangement for centering the lips and a metal foil is inserted between the lips to improve the toughness of the weld material, the foil having a carbon content lower than that of the parent metal of the workpieces.
    Type: Grant
    Filed: October 21, 1975
    Date of Patent: December 13, 1977
    Assignee: BBC Brown Boveri & Company Limited
    Inventor: Gottfried Kuhnen
  • Patent number: 4049186
    Abstract: The stress corrosion tendency of a welded pipe in service in a nuclear reactor water line is reduced by applying to the outside of the pipe a secondary weld bridging the primary weld of the joint beyond the axial extremities of the primary weld heat affected zone and particularly that part of the zone at the inner surface of the pipe.
    Type: Grant
    Filed: October 20, 1976
    Date of Patent: September 20, 1977
    Assignee: General Electric Company
    Inventors: Rodney E. Hanneman, Richard M. Chrenko, Donald B. Kittle
  • Patent number: 4049941
    Abstract: Welding connector comprising a housing, means for accommodating an electrode, an insulating cone for fitting within a conical passage, and magnetic means for securely fitting such cone to such passage. Method of passing electrical current from outside a metal pipe to inside thereof.
    Type: Grant
    Filed: April 14, 1976
    Date of Patent: September 20, 1977
    Assignee: Lillie Evelyn Beatty
    Inventor: Bennie V. Beatty
  • Patent number: 4020312
    Abstract: A method of manufacturing a thick, high-strength steel pipe for low temperature service comprising the steps of forming into tubular shape a steel plate having a thickness of over 12 mm and a specific composition, of which the C.sub.eq value is adjusted to less than 0.50, when the Mn content is less than 1.0 % whereas the C.sub.eq value is adjusted to less than 0.45 when the Mn content is over 1.0 % and less than 2.0 %, and nextly of welding said tube form at high speeds and high efficiency by the process of single electrode or multiple electrode large-current gas-shielded arc welding with one pass per electrode on each side of the seam at a specific condition, each electrode preferably consisting of a solid wire essentially containing less than 0.3 % Ti with or without the addition of less than 0.
    Type: Grant
    Filed: November 21, 1975
    Date of Patent: April 26, 1977
    Assignees: Nippon Kokan Kabushiki Kaisha, Kobe Steel Ltd.
    Inventors: Mutsuro Araki, Bunshiro Sakai, Itaru Watanabe, Makoto Yamada, Koshiro Tsukada, Tomokazu Godai, Isao Aida, Masatoshi Nakagaki
  • Patent number: 4016394
    Abstract: In the production of longitudinally welded pipes, the metal strip is treated with a chemical deoxidizing agent, such as a hydrazine compound, to remove oxides from at least the strip edges, prior to arc welding, to provide an improved weld.
    Type: Grant
    Filed: February 10, 1975
    Date of Patent: April 5, 1977
    Assignee: Kabel-und Metallwerke Gutehoffnungshutte Aktiengesellschaft
    Inventors: Meinhard Hecht, Herbert Kubiak
  • Patent number: 3968000
    Abstract: An end plug is formed by heat-sealing or welding a V-shaped section cut from the wall of a first pipe to a complementary shaped butt end of a second pipe.
    Type: Grant
    Filed: April 7, 1975
    Date of Patent: July 6, 1976
    Assignee: Phillips Petroleum Company
    Inventors: James C. Carroll, Clel H. Shafer
  • Patent number: 3937916
    Abstract: Apparatus for welding parts, such as pipes, end to end by means of an electric arc which is caused to rotate along the adjacent edges of the pipes. Two separate magnetic fields are used to cause the arc to follow a spiral path along the edges so that pipes having a wall thickness greater than one quarter of an inch may be welded.
    Type: Grant
    Filed: July 22, 1974
    Date of Patent: February 10, 1976
    Assignee: Welding Research, Inc.
    Inventor: David Sciaky
  • Patent number: 3935414
    Abstract: Automatic fixed position pipe welding is carried out by gas-shielded electric arc welding with a novel flux-cored electrode wire having a low-carbon sheel sheath containing a core filling of, by weight, 16-17 percent ferro manganese, 10-11 percent ferro silicon, 1-4 percent manganous oxide, 1/2-1 percent potassium aluminum fluoride, and the balance rutile. The wire exterior is shiny and metallic-appearing, and the wire is configured to have folded-in edges.
    Type: Grant
    Filed: October 11, 1974
    Date of Patent: January 27, 1976
    Assignee: Unicore, Inc.
    Inventors: John T. Ballass, Richard A. Georgetti