Gas Supply (e.g., By Ingredient Of Electrode, By External Source) Patents (Class 219/74)
  • Patent number: 7754993
    Abstract: Welding repairs are performed in an underwater environment adjacent the bottom head of the nuclear reactor vessel. To provide a dry welding environment, segments of a lower caisson are passed through the core plate holes and assembled along the interior surface of the bottom head. The assembled segments are held down by brackets and sealed to one another and to the bottom head by a water curable polymer. An upper caisson is passed through the core plate hole to sealingly engage the lower caisson. The caissons are pumped dry and welding equipment is passed through the caissons to effect weld repairs about the stub tube or along the bottom head cladding.
    Type: Grant
    Filed: July 10, 2006
    Date of Patent: July 13, 2010
    Assignee: General Electric Company
    Inventor: Frank Ortega
  • Publication number: 20100170878
    Abstract: A method is disclosed including operations for repairing a component. The method includes providing a component including one of titanium and a titanium alloy, providing a laser deposition device, and providing a shielding means that ensures an oxygen content remains below a first threshold and that a water vapor content remains below a second threshold in a target area of the component. The method further includes depositing a metal material on the component, where the depositing includes operating the deposition device along a tool path including a plurality of tool passes, wherein the tool path further comprises a deposition device velocity specification, a laser power specification, and a specified delay time between each of the plurality of tool passes.
    Type: Application
    Filed: December 14, 2009
    Publication date: July 8, 2010
    Inventor: Gregory Thomas Krause
  • Publication number: 20100159265
    Abstract: Provided are butt welds and methods of making such butt welds using a combination of fusion root welding and friction stir welding to yield welds with decreased propensity for dropout during friction stir welding without the need for a back-up support plate. In one form of the present disclosure, the butt weld includes: two or more abutting structural steel components beveled on faying surfaces on one side of the components to form a suitably shaped fusion root weld groove and unbeveled on faying surfaces on the opposite side of the components and interconnected with a first fusion root weld on the beveled side of the components and a second friction stir weld on the unbeveled side of the components, wherein the first fusion root weld has a width ranging from 7 mm to 30 mm, a penetration depth ranging from 2 mm to 20 mm, and an overfill ranging from 2 mm to 5 mm, and wherein the stir zone of the second friction stir weld penetrates the first fusion root weld.
    Type: Application
    Filed: December 17, 2009
    Publication date: June 24, 2010
    Inventors: Douglas Paul Fairchild, Steven Jeffrey Ford, Amit Kumar, Nathan Eugene Nissley, Nicholas E. Biery, Mario L. Macia
  • Publication number: 20100133240
    Abstract: A method of consumable electrode type gas shield arc welding characterized in that a shield gas consisting of an inert gas is fed toward a consumable electrode and an addition gas consisting of a mixture of oxidizing gas and inert gas toward an outer edge of welding pool. Further, there is provided a welding torch for use in the method. Thus, in the welding of steel material in accordance with GMA welding technique, the dissolved oxygen concentration of the weld metal can be reduced to 100 ppm or less, and while maintaining arc stability, desirable bead formation can be attained.
    Type: Application
    Filed: August 10, 2006
    Publication date: June 3, 2010
    Inventors: Makoto Takahashi, Toyoyuki Sato, Terumi Nakamura, Kazuo Hiraoka
  • Patent number: 7718914
    Abstract: A method of gas-shielded metal arc joining using a consumable electrode having an alternating polarity (GMA-AC). A shielding gas containing argon is used to improve process stability and working speed.
    Type: Grant
    Filed: June 6, 2007
    Date of Patent: May 18, 2010
    Assignee: Linde Aktiengesellschaft
    Inventor: Ernst Miklos
  • Patent number: 7718915
    Abstract: A shielding gas for MAG welding wherein a carbon steel solid wire is used for lap fillet welding of a galvanized steel sheet; wherein the shielding gas is a mixed gas composition consisting of 8 to 15% by volume of oxygen, 20 to 30% by volume of carbon dioxide, and residual % by volume of argon.
    Type: Grant
    Filed: October 22, 2007
    Date of Patent: May 18, 2010
    Assignee: Taiyo Nippon Sanso Corporation
    Inventors: Katsunori Wada, Toshikazu Kamei
  • Publication number: 20100108646
    Abstract: Methods for arc welding unalloyed or low-alloy steels with consumable electrode under protective gas are suggested, in which the protective gas is a mixture comprising at least helium and an active gas as well as a further inert gas. In the general case, the proportion of the active gas in the total volume of the protective gas is to be in the range from more than 0.5% to approximately 1,5% and the proportion of helium in the total volume of the protective gas is to be more than 30%. In case an electrode having a lowered or medium Si content of approximately 0.2% to approximately 0.4% is used, the proportion of the active gas in the total volume of the protective gas is to be approximately 1% to approximately 5%. If an electrode with a low Si content of approximately 0.05% to approximately 0.1% is used, the proportion of the active gas in the total volume of the protective gas is to be approximately 3% to approximately 10%.
    Type: Application
    Filed: October 30, 2009
    Publication date: May 6, 2010
    Applicant: Linde AG
    Inventor: Christoph Matz
  • Publication number: 20100108645
    Abstract: The invention relates to a device for automatic under-water welding for making a welding joint (3) on a surface (2), of the type comprising a welding torch (20) including an electrode (21) surrounded by a protection envelope (23) that defines together with said electrode (21) an annular channel (24) connected to means for supplying a protection gas. The welding torch (20) is provided axially at the centre of a set (30) of two concentric envelopes (31, 32), one of which at least is capable of axial displacement and can be adjusted relative to said surface (2), said envelopes defining between them an annular gap (34) for injecting a flow for drying the welding area and keeping it away from the water.
    Type: Application
    Filed: October 26, 2007
    Publication date: May 6, 2010
    Applicant: AREVA NP
    Inventors: Emmanuel Viard, Andre Thomas, Jean Mouget, Gabriel Merle
  • Publication number: 20100102037
    Abstract: The invention relates to a MIG- or MAG-welding gun, comprising a hand-held grip for supporting, handling and aiming the welding gun during a welding process, the grip including a body member (1). The grip further includes a grip member (2) pivotable relative to the body member (1) and lying alongside the body member over at least part of the same lengthwise extent as the body member. The grip member (2) has its free end pivotable to such a distance from the body member (1) that a hand grasping around the pivotable grip member (2) fits between the body member (1) and the pivotable grip member (2), the body member (1) resting on top of the hand. When the pivotable grip member (2) has its free end is in its position pivoted into the engagement with the body member (1), these two components constitute jointly a handle for the hand to grasp around.
    Type: Application
    Filed: March 7, 2008
    Publication date: April 29, 2010
    Inventor: Erkki Tapio Kettunen
  • Publication number: 20100096366
    Abstract: A joining device for joining a component to a workpiece. The device includes a component holder which moves the component along an axis in a first direction towards the workpiece in order to connect the component to the workpiece, and has a protective gas feed in order to carry out a welding process in a protective gas atmosphere. During the welding process the protective gas is discharged essentially in a second direction which is opposed to the first direction. An elastic sealing sleeve including folding bellows is arranged in relation to the component holder in such a way that a welding space, which is bounded by the workpiece, the component holder, the component and the sealing sleeve and through which the protective gas flows, is sealed off from the external surroundings during the welding process so that the protective gas can escape only in the second direction.
    Type: Application
    Filed: November 18, 2009
    Publication date: April 22, 2010
    Applicant: NEWFREY LLC
    Inventors: Klaus-Gisbert SCHMITT, Wolfgang DOKUPIL, Lothar GERLACH, Michael SCHNEIDER
  • Publication number: 20100089877
    Abstract: An arc welding method using a welding material having a low transformation temperature, characterized in that it is carried out by the use of a shielding gas consisting of a rare gas alone or a mixed gas of a rare gas and a small amount of an oxygen gas; and an additional welding method using a welding material having a low transformation temperature, characterized in that it is carried out while moving a weld line in the form of a straight line. The former method allows the enhancement of a Charpy value in combination with improved fatigue strength, and the latter allows the experience of heat history of the material having a low transformation temperature to be suppressed, resulting in the prevention of weld crack in combination with an improved fatigue strength.
    Type: Application
    Filed: December 11, 2009
    Publication date: April 15, 2010
    Inventors: Akihiko OHTA, Naoyuki SUZUKI, Yoshio MAEDA
  • Patent number: 7690549
    Abstract: A purge arrangement for welding backup of a seam between two surfaces selected for welding together along respective runs which define the seam includes a ventilated tubeform and an adhesive tape attached for forming a seal across the back of the seam and sealing in the ventilated tubeform. The ventilated tubeform adapted for flooding with a purge gas by a source thereof. The adhesive tape's seal across the back of the seam traps the flood of the purge gas in the interspace between the tape and seam and ultimately flushes the as-yet un-welded portions of the seam with the purge gas.
    Type: Grant
    Filed: August 14, 2007
    Date of Patent: April 6, 2010
    Inventor: Howard S. Owensby
  • Publication number: 20100065532
    Abstract: An underwater fastener welding apparatus that includes a welding tool positioned within a watertight housing. The housing includes an inlet coupled to a source of pressurized gas. The housing is pressurized to balance a pressure internal to and external to the housing when the underwater welding apparatus depth level is changed.
    Type: Application
    Filed: August 7, 2009
    Publication date: March 18, 2010
    Inventor: Clark Champney
  • Publication number: 20100059485
    Abstract: A method and apparatus for MIG-MIG welding includes at least first and second sources (104,114) of wire, and first and second sources of power (102,112). The first source of wire provides a first wire (106) to a main arc between the first wire (106) and a workpiece (110). The first source of power (102) provides MIG power to a first current path including the first wire (106) and the workpiece (110). The second source of wire provides a second wire to a filler arc between the first wire (106) and the second wire (116). The second source of power (112) provides MIG power to a second current path including the first wire (106) and the second wire (116).
    Type: Application
    Filed: December 19, 2005
    Publication date: March 11, 2010
    Inventors: Richard M. Hutchison, Joseph K. Fink
  • Patent number: 7673786
    Abstract: Systems for coupling end portions of two elongated heater portions and methods of using such systems to treat a subsurface formation are described herein. A system may include a holding system configured to hold end portions of the two elongated heater portions so that the end portions are abutted together or located near each other; a shield for enclosing the end portions, and one or more inert gas inlets configured to provide at least one inert gas to flush the system with inert gas during welding of the end portions. The shield may be configured to inhibit oxidation during welding that joins the end portions together. The shield may include a hinged door that, when closed, is configured to at least partially isolate the interior of the shield from the atmosphere. The hinged door, when open, is configured to allow access to the interior of the shield.
    Type: Grant
    Filed: April 20, 2007
    Date of Patent: March 9, 2010
    Assignee: Shell Oil Company
    Inventor: James Louis Menotti
  • Publication number: 20100044347
    Abstract: A porosity free weld is formed at the surface of an aluminum object. The object is enclosed in a welding box that is sealed and purged with an inert gas, and preheated to at least 100° C. Welding of one pass of the weld using a gas-tungsten arc welding method with AC current and shielding gas mixture of argon and helium is followed by removal of the top portion of the bead. The process of preheating, formation of a weld bead and top portion removal are repeated to achieve the desired weld thickness or build-up.
    Type: Application
    Filed: September 22, 2008
    Publication date: February 25, 2010
    Inventor: Zdenek Prochazka
  • Publication number: 20100038345
    Abstract: A consumable electrode gas shield arc welding torch (20) includes a torch body (21), a tip body (22) mounted to a front end of the torch body, a tip holder (23) mounted to a front end of the tip body, a spring (26) provided in the tip body (22) in contact with the front end of the torch body (21), a pressing shaft (27) provided in the tip body (22) in contact with a front end of the spring 26) and a power feed tip (28) pressed by the pressing shaft (27) and the tip holder (23). The tip (28) includes a side surface having a projection contacting with a base end (23a) of the holder (23), with a space (29) defined between an inner surface of the holder (23) and a front end (28a) of the tip (28) when the front end (28a) of the tip (28) is inserted into the holder (23).
    Type: Application
    Filed: August 10, 2007
    Publication date: February 18, 2010
    Inventor: Masaru Nishimura
  • Publication number: 20100025380
    Abstract: The invention relates to a welding torch comprising a torch body that is elongate along a longitudinal direction and that presents a working end, an electrode having a portion that projects longitudinally from the working end, and a channel for a flow of protective gas formed inside the body and terminating at the working end via at least one opening for ejecting gas in the form of a jet towards the projecting portion of the electrode. According to the invention, the torch includes jet-enlarger means for enlarging the jet of gas, which jet-enlarger means are in the form of a convex open-work grid covering the gas ejection opening(s).
    Type: Application
    Filed: June 15, 2006
    Publication date: February 4, 2010
    Applicant: AREVA NP
    Inventors: Bernard Bon, Alain Peigney
  • Publication number: 20100025381
    Abstract: A method for arc joining, in particular for M[etal]S[hielding]G[as] welding and/or for M[etal]S[hielding]G[as] soldering of at least one object made of titanium and/or of at least a titanium alloy under shielding gas in the presence of at least one melting electrode, wherein at least an inert gas is supplied as shielding gas in such a manner that the arc burns in a stable and calm manner in response to the arc joining. The shielding gas further includes at least one active gas.
    Type: Application
    Filed: January 21, 2009
    Publication date: February 4, 2010
    Inventor: Thomas AMMANN
  • Publication number: 20100012625
    Abstract: A purging system for an arc welder is disclosed wherein the purging system comprises a control system (20), at least one automatic flow control arrangement (MFC) for a purge gas (28, 30), said flow control arrangement (WIFC) being operably associated with said control system (20), said control system (20) controlling operation of said at least one automatic flow control (MFC) to control flow rate of purge gas (28, 30) to a weld site (W) during a welding operation. An apparatus for purge control of a welding system is disclosed wherein the apparatus comprises a control system (20) and a mass flow controller (MFC), said mass flow controller (MFC) comprising an input that receives a purge gas (28, 30) and an output that provides purge gas (28, 30) to a weld site (W) during a welding operation, said control system adjusting flow of purge gas (28, 30) to the weld site (W) during a welding operation.
    Type: Application
    Filed: October 19, 2007
    Publication date: January 21, 2010
    Applicant: Swagelok Company
    Inventors: Kevin C. Silk, Alas A. Richard, William Ponikvar, Michael Mussig, David N. Stafford
  • Publication number: 20100006545
    Abstract: A method and apparatus utilized in forming weld joint is described. In the method, a strength weld between two members is formed by a first welding process and a first weld metal. Then, one or more strain welds are formed by depositing a second weld metal adjacent to the strength weld using a second welding process. The strain welds are configured to form a weld joint having a specific minimum height and width to handle tensile strain to a specific strain capacity.
    Type: Application
    Filed: October 23, 2006
    Publication date: January 14, 2010
    Inventors: Mario L. Macia, Karel Minnaar, Scott D. Papka, Wlliam J. Sisak
  • Publication number: 20100000975
    Abstract: This disclosure provides a joining area and method between copper and stainless steel or titanium, as well as the permanent cathode obtained, where said joining area is made of a first zone of a copper-nickel (Cu—Ni) alloy, an intermediate zone with a mostly nickel alloy or pure nickel and a second zone made of a stainless steel-nickel alloy, which is the result of the participating materials being cast in an arc welding process, for example TIG, MIG or manual arc using electrodes of nickel as welding contributor between said materials and their space arrangement, that is to say, leaving a separation between the materials when performing the welding process, thus ensuring as follows: a) greater tensile strength, b) a substantial improvement of corrosion resistance of the joint welding, and c) improvement of conductibility, which can be improved still further by modifying the straight design of the conducting bar by providing it with the “horn”-type shape.
    Type: Application
    Filed: September 11, 2009
    Publication date: January 7, 2010
    Inventors: Antonio Carracedo Rosende, Horacio Rafart Mouthon
  • Patent number: 7632556
    Abstract: A self-adhesive purge dam for retaining purge gas around a weld zone includes a base configured to substantially obstruct an air passage leading to the weld zone and an adhesive skirt extending from the base and configured to engage portions of the air passage. An adhesive on the adhesive skirt allows the skirt to be adhered to the air passage. An optional removable backing covers the adhesive prior to installation. The adhesive skirt is deployable from a stowed position wherein the adhesive is generally disposed in an interior portion of the purge dam to an installation position wherein the adhesive can be pressed against a surface to which the purge dam is to be adhered. The purge dam can be installed by inserting it in the air passage with the adhesive skirt in the stowed position, removing the removable backing prior to or after insertion in the air passage, exposing the adhesive, and deploying the skirt to the installation position for adhesion.
    Type: Grant
    Filed: March 4, 2005
    Date of Patent: December 15, 2009
    Inventor: Michael Hacikyan
  • Publication number: 20090302007
    Abstract: The invention relates to a device for centring and clamping conduits which are preferably made from alloy steel and which are positioned end to end in order to be welded to form a pipeline. The invention comprises: means for centring and clamping two conduits that are to be welded, optional leak-tight partition means which define an inerting chamber at the mating surface, and inert gas distribution means for creating a protective atmosphere at the mating surface. The inventive device also comprises at least means for regulating the flow of inert gas and/or the supply pressure of said inert gas as a function of the concentration of O2 measured in the protective atmosphere and/or the pressure measured within said atmosphere, such as to maintain the O2 content of the atmosphere below a pre-determined alarm threshold value and/or the pressure of the atmosphere below a pre-determined threshold value.
    Type: Application
    Filed: May 22, 2006
    Publication date: December 10, 2009
    Inventors: Gilles Richard, Eric L'Arvor
  • Publication number: 20090277877
    Abstract: An apparatus and method for welding objects having a butt joint includes providing at least one welding torch, providing a fixture to hold at least one object to be welded, moving the at least one welding torch over the butt joint, heating the butt joint with the at least one welding torch, forming a bridge across a gap of the butt joint from heated parent material of the at least one object in a first welding operation, moving the at least one welding torch over the butt joint, and filling the gap of the butt joint with a filler material being fused with the bridge of the butt joint in a second welding operation to weld the butt joint together.
    Type: Application
    Filed: May 8, 2008
    Publication date: November 12, 2009
    Inventors: Craig A. Daniels, Joseph Langan
  • Publication number: 20090277878
    Abstract: The invention relates to an insertion element (17) for a gas lens (4) of a WIG/TIG welding torch (1), to a gas lens (4) for a WIG/TIG welding torch (1), and to a WIG/TIG welding torch (1). To improve gas distribution across the cross-section of the gas lens (4) and/or the gas nozzle (9), and to provide for as small a size and as low a weight of the components as possible, an insertion element (17) with a bore (23) in the center through which an electrode (12) is to be guided is arranged, with fan-shaped flow elements (24) being positioned around the bore (23) and twisted relative to the plane of the bore (23) so as to provide for radial deviation of a gas (7, 27) flowing therethrough.
    Type: Application
    Filed: August 22, 2007
    Publication date: November 12, 2009
    Inventors: Jochen Fessl, Melanie Gebesmair, Josef Leeb
  • Publication number: 20090236319
    Abstract: A method for joining at least two objects by a joining means selected from resistance welding, resistance soldering and a magnetically impelled arc, in which the objects are brought into contact with one another in the area to be joined, such that the objects are joined to one another in a particularly stable and/or particularly homogenous fashion and oxidation of the area to be joined is reliably prevented. The respective base metal of the objects is fused at least in the contact area, and in that at least one inert gas and/or at least an inert gas mixture is supplied at least to the contact area of the objects such that the fusing of the respective base metal takes place under an inert gas atmosphere.
    Type: Application
    Filed: September 23, 2008
    Publication date: September 24, 2009
    Inventor: Christoph MATZ
  • Publication number: 20090236320
    Abstract: The present invention provides a method for tandem gas metal arc welding using a leading electrode and a trailing electrode, wherein a shielding gas for the leading electrode is a two-component mixed gas containing argon and carbon dioxide, or a three-component mixed gas containing argon, carbon dioxide, and oxygen; a shielding gas for the trailing electrode is argon, a two-component mixed gas containing argon and carbon dioxide, a two-component mixed gas containing argon and oxygen, or a three-component mixed gas containing argon, carbon dioxide, and oxygen; and the concentration of carbon dioxide in the shielding gas for the trailing electrode is lower than the concentration of carbon dioxide in the shielding gas for the leading electrode.
    Type: Application
    Filed: August 1, 2007
    Publication date: September 24, 2009
    Inventors: Yuichiro Enatsu, Makoto Takahashi
  • Publication number: 20090230094
    Abstract: A novel type of welding chamber for welding refractory metals such as titanium, that is open on the top rather than completely enclosed like other welding chambers is disclosed. Pressurized argon, an inert gas, is introduced into the bottom chamber of the device through a diffuser. The argon is then forced to travel upward through a gas-permeable welding bed formed above the accumulation chamber, the welding bed made from a conductive and gas-permeable material. The present invention creates an argon cloud of substantially 100% argon for welding titanium and other refractory metals therein. The argon cloud is constrained by a curtain barrier and the property that argon is heavier than air. The argon cloud substantially stays in place when not disturbed by movement of air above it. Workpieces are placed into the argon cloud and onto the welding bed to be welded.
    Type: Application
    Filed: March 14, 2008
    Publication date: September 17, 2009
    Inventor: Joseph E. Corne
  • Publication number: 20090206060
    Abstract: The present invention relates to a welding torch that includes an electrode (3) that has a longitudinal groove (9) formed therein which guides a welding wire (4) which is fed form a laterally spaced-apart location. The electrode (3) is open and the wire (4) is supported on one side only. In the region of the welding tip, the electrode (3) is elongate and the cross-sectional area is smaller than the area at a position further from the tip. Regions between an outer housing (11) and a main support body (2) define two shielding gas conduits positioned on opposite sides of the body (2), through which gas flows and then combines to form a unitary stream. The body (2) contains cooled regions which are supplied with cooling fluid by a conduit (7) and removed by conduit (8), parts of which are positioned between the shielding gas conduits close to the welding electrode (3).
    Type: Application
    Filed: August 22, 2005
    Publication date: August 20, 2009
    Applicant: SAIPEM S.P.A.
    Inventors: Cristian Scaini, Christian Cocca, Andrea Provesi
  • Publication number: 20090188896
    Abstract: A gas metal arc welding system comprising, and a method of welding a plurality of workpieces utilizing, a plurality of individually selectable and separately controlled wire feeds, wherein the feeds preferably present differing wire diameters and compositions and predetermined wire contributions are combined during welding so as to present a weld pool and joint having aggregate properties.
    Type: Application
    Filed: January 25, 2008
    Publication date: July 30, 2009
    Inventors: Alexander D. Khakhalev, Jay Hampton
  • Publication number: 20090169912
    Abstract: In one embodiment, a tubular assembly is provided, comprising a first iron based tubular having a first non-cladded inner surface; and a second iron based tubular having a second non-cladded inner surface, wherein the first tubular is connected to the second tubular using a non-iron based bonding material. Preferably, the non-iron based bonding material has a lower crack growth rate than the iron based tubulars.
    Type: Application
    Filed: April 10, 2006
    Publication date: July 2, 2009
    Inventors: Douglas S. Hoyt, Michael S. Weir, Wan C. Kan
  • Publication number: 20090145884
    Abstract: In order to additionally develop a forming device for delivering at least one root shielding gas to the root side of at least one region to be joined of at least one object, as well as a corresponding method, such that discolorations and the formation of coatings on the object to be joined are effectively prevented, the invention proposes that the delivered root shielding gas is directed, and guided or deflected in the direction along the root side of the region to be joined.
    Type: Application
    Filed: December 3, 2008
    Publication date: June 11, 2009
    Inventors: Thomas AMMANN, Laurentius DRESSEL
  • Publication number: 20090107958
    Abstract: A torch for gas metal arc welding includes a torch housing and a contact tip mounted on the housing and having an electrode bore through which electrode wire is fed. A nozzle mounted on the housing surrounds the contact tip to define an annular gas passage between the contact tip and the inside of the nozzle. A shielding gas inlet communicates a shielding gas into the annular gas passage so that the shielding gas flows out of the nozzle. A plurality of auxiliary flow passages are provided in the contact tip, and have open ends arranged around the electrode bore. The auxiliary flow passages communicate with the gas inlet and surround the electrode wire with an auxiliary flow of shielding gas that is closer to the electrode wire than the shielding gas flow that is provided through the annular gas passage between the contact tip and the nozzle.
    Type: Application
    Filed: October 26, 2007
    Publication date: April 30, 2009
    Inventor: Alexander D. Khakhalev
  • Publication number: 20090107960
    Abstract: A weld stability system for an arc welding apparatus and method of operation is disclosed. The weld stability system may comprise a shielding gas supply and a control assembly. The shielding gas supply may include a first source of gas, a second source of gas, a mixing chamber, a first valve selectively connecting the first source of gas to the mixing chamber, a second valve selectively connecting the second source of gas to the mixing chamber, and a shielding gas supply line configured to direct gas from the mixing chamber to a weld gun. The control assembly may include a controller operatively engaging the first and second valves, and at least one sensor configured to monitor a parameter of an arc welding process and communicate with the controller.
    Type: Application
    Filed: October 30, 2007
    Publication date: April 30, 2009
    Inventor: Jay Hampton
  • Publication number: 20090107959
    Abstract: A method and apparatus for controlling arc shielding gas during an arc welding operation is disclosed. The method may include the steps of actuating a first valve connected to an arc initiation source of gas to selectively allow arc initiation gas to flow through a mixing chamber; initiating an arc; actuating a second valve connected to a primary shielding source of gas to selectively allow primary shielding gas to flow through the mixing chamber; actuating the first valve to reduce, if needed, the arc initiation gas flow from the arc initiation source of gas; and continuing with the arc welding operation. The arc welding operation may also include actuating the first valve to cause the arc welding operation to operate in a different metal transfer mode when it is desirable, or when the arc welding operation is nearing completion.
    Type: Application
    Filed: October 29, 2007
    Publication date: April 30, 2009
    Inventors: Alexander D. Khakhalev, Jay Hampton
  • Patent number: 7520538
    Abstract: A purge gas introduction system for an orbital tube welding setup is provided, configured to inject high purity inert purge gas to the interior volume of a tube or tubular component. An o-ring is interposed between an annular base and an annular ring, their junction forming an annular o-ring groove, each part forming one sidewall, with the o-ring fully recessed within the groove, protecting the o-ring during the insertion and removal of a tube. The annular base and an annular ring are configured to receive a tube terminus. The sidewalls of the o-ring groove are divergent one to the other, wherein as the annular ring is drawn towards the annular base, the o-ring is forced partially out of the groove, forming a substantially leak tight seal between the tube and the o-ring. A purge gas from an external source is transmitted to the annular base through a purge connector, then, in turn, introduced to the interior volume of the tube.
    Type: Grant
    Filed: January 14, 2005
    Date of Patent: April 21, 2009
    Inventor: Kevin David McGushion
  • Patent number: 7518082
    Abstract: A method for joining components made from ductile cast iron and made from ductile cast iron and steel, by arc welding with fusible electrodes under a gas blanket. The gas blanket comprises, in addition to argon, 1 to 25 vol. % carbon dioxide and/or 0.5 to 10 vol. % oxygen. The gas blanket can also comprise nitrogen monoxide. Said method permits high welding speeds and hence a high productivity. The joint quality can be further advantageously improved by means of a pre-heating of the components and a slow cooling or a post-treatment.
    Type: Grant
    Filed: November 29, 2003
    Date of Patent: April 14, 2009
    Assignee: Linde Aktiengesellschaft
    Inventors: Stefan Helgee, Jorma Tani
  • Publication number: 20090071942
    Abstract: A method of welding includes continuously passing a MIG electrode through a welding tip and nozzle of a welding gun, where a stickout distance of the MIG electrode is maintained in the range of about 1¼ to about 2 inches during welding. Further, a length of the nozzle of the welding gun is such that a distance between the end of the nozzle of the end of the electrode is about ¼ inch to about ¾ inch.
    Type: Application
    Filed: September 14, 2007
    Publication date: March 19, 2009
    Applicant: LINCOLN GLOBAL, INC.
    Inventors: Jeff Kachline, Douglas Bull
  • Publication number: 20090057373
    Abstract: A multi-purpose end effector for a welding robot includes a base plate mounted on a robot and carrying a plurality of tools including a welder, a cleaning wheel for cleaning a workpiece, and a buffing wheel for buffing the weld. The tools are arranged in serial order on the base plate beginning with the cleaning wheel to clean workpieces, then the welder for welding the workpieces, and then the buffing wheel to buff the weld.
    Type: Application
    Filed: August 30, 2007
    Publication date: March 5, 2009
    Inventors: Ayad K. Darzi, Robert L. Keyes
  • Publication number: 20090050606
    Abstract: A welding head assembly for use with a torch. The torch has an electrical contact and a gas passage for operatively supporting an electrode with a working end of the electrode at a first location. The welding head assembly has a body, a gas flow path, a gas outlet, an electrical flow path, and an electrode. The body extends between a first end and a second end where the first end is releasably coupled to the torch. The gas flow path and electrical flow path extend between the first and the second end. The electrode is located at the second end remote from the first location.
    Type: Application
    Filed: August 22, 2007
    Publication date: February 26, 2009
    Inventor: David Colbert Smith
  • Publication number: 20090032571
    Abstract: Methods and associated systems for welding a particle-matrix composite body to another body are disclosed. In some embodiments, a particle-matrix bit body may be welded to a metal coupler. In one embodiment, a heating torch may heat a first localized volume of the particle-matrix composite body to a temperature below the melting temperature of the matrix material of the particle-matrix composite body. A welding torch may simultaneously melt a second localized volume proximate the first localized volume to a temperature above the melting temperature of the matrix material of the particle-matrix composite body to weld the particle-matrix composite body to another body.
    Type: Application
    Filed: August 3, 2007
    Publication date: February 5, 2009
    Inventor: Redd H. Smith
  • Publication number: 20090026173
    Abstract: Disclosed is a method for welding an article, the method including the steps of placing the article in an enclosure with walls that enclose the article on all sides, the enclosure having a heating device associated therewith, the heating device configured and sized to uniformly heat the article over at least a substantial entirety of the article, establishing a nonreactive atmosphere in the enclosure, operating the heating device to uniformly heat the article in the enclosure to a welding temperature over at least the substantial entirety of the article, and welding the article in the enclosure while maintaining the welding temperature over at least the substantial entirety of the article.
    Type: Application
    Filed: July 26, 2007
    Publication date: January 29, 2009
    Applicant: General Electric Company
    Inventors: Michael Douglas Arnett, Daniel Anthony Nowak
  • Publication number: 20090020510
    Abstract: A method for electric arc joining, in particular for arc welding and/or arc soldering, under protective gas using the method of T[ungsten] l[nert] G[as] joining, in particular TIG welding and/or TIG soldering, at least one gas mixture having the composition essentially argon and/or helium and carbon dioxide in a proportion range from approximately 0.2 volume-percent (vol.-%) to approximately 0.7 vol.-% being supplied as the protective gas, as well as a corresponding protective gas, in such a manner that weld pool movements, electric arc turbulence, and occurrences of wear of the T[ungsten] l[nert] G[as] electrode may be reliably avoided. The protective gas also has hydrogen in a proportion range from approximately 1.8 vol.-% to approximately 9 vol.-%.
    Type: Application
    Filed: June 13, 2008
    Publication date: January 22, 2009
    Inventors: Eberhard Brune, Hans Grollimund, Thomas Ammann
  • Publication number: 20090017328
    Abstract: There are provided a flux cored wire for joining dissimilar materials with each other, capable of enhancing a bonding strength upon joining an aluminum-base material with a steel-base material, and excellent in bonding efficiency, a method for joining the dissimilar materials with each other, and a bonded joint obtained by the method. In particular, there is provided a method for joining dissimilar materials with each other, in the case of melt weld-bonding of high-strength dissimilar materials with each other, that is, the high-strength steel member with the high-strength 6000 series aluminum alloy member and in the case of the steel member being a galvanized steel member. In one mode, use is made of a flux cored wire wherein the interior of an aluminum alloy envelope is filled up with a flux, the flux has fluoride composition containing a given amount of AlF3 without containing chloride, and the aluminum alloy of the envelope contains Si in a range of 1 to 13 mass %.
    Type: Application
    Filed: February 6, 2007
    Publication date: January 15, 2009
    Applicant: Kabkushiki Kaisha Kobe Seiko Sho (Kobe Stell, Ltd.
    Inventors: Jun Katoh, Mikako Takeda, Seiji Sasabe, Katsushi Matsumoto, Hidekazu Ido, Tsuyoshi Matsumoto
  • Publication number: 20080314876
    Abstract: A welding system, in certain embodiments, includes a torch having a neck with an arcuate portion, and a resilient jump liner disposed in the neck and extending through the arcuate portion. The resilient jump liner includes a pathway having a curvature configured to bend a welding wire passing through the pathway. The system also includes an annular support disposed about the resilient jump liner inside the neck, wherein the annular support is configured to at least substantially fix the curvature to force the welding wire to achieve a wire curvature. The system also includes a contact tip coupled to the neck, wherein the wire curvature is configured to bias the welding wire into substantially consistent contact with an interior pathway through the contact tip.
    Type: Application
    Filed: May 28, 2008
    Publication date: December 25, 2008
    Inventors: Paul David Pinsonneault, Tiejun Ma, Thomas Jaeger
  • Patent number: 7462799
    Abstract: Welding shielding gas is often wasted because the welding operator sets flow rates excessively high. The flow rate limiting apparatus described can be added externally to a needle valve flow control adjustment knob in a flow control device. It is connected such that it limits the degree of allowable movement of the flow control knob. It can be locked with a key type tool to prevent changes. Even when the maximum flow is set and locked, the flow can still be lowered by the operator from the maximum allowable flow setting. This ability allows the operator to adjust flow for differing needs and may further decrease gas usage. Eliminating the ability to set excessively high flow rates also prevents the creation of turbulent flow exiting the shielding gas nozzle or cup thereby eliminating air entrainment into the shielding gas stream improving weld quality.
    Type: Grant
    Filed: January 17, 2006
    Date of Patent: December 9, 2008
    Inventor: Gerald Daniel Uttrachi
  • Publication number: 20080290072
    Abstract: In accordance with one embodiment, the present technique relates to a welding torch handle that has an unenclosed slot extending from one end thereof. This unenclosed slot provides a mechanism through which insulated signal leads of a conductor can extend from the interior of the handle to connect with a trigger disposed outside the handle. As one advantage, the unenclosed nature of the slot facilitates this coupling without the need for threading of the leads, which can damage the leads.
    Type: Application
    Filed: May 21, 2007
    Publication date: November 27, 2008
    Inventor: Peter Serio
  • Publication number: 20080283505
    Abstract: Conduits exiting from a welding torch handle are supported by a stiffening arrangement to limit the angle or radius of curvature of the conduits and thereby to limit strain and possible damage. The stiffening arrangement may include a stiffener that does not extend completely around the conduits, but is captured in a jacket that may be secured to the torch handle and wrapped around the conduits. Alternatively, an integral stiffener or stiffener assembly may include a tongue-like-stiffener extending from the handle to support the conduits and to limit their radius of curvature as they exit the handle.
    Type: Application
    Filed: May 15, 2007
    Publication date: November 20, 2008
    Inventors: Mark Richard Christopher, Kenneth J. Puls
  • Publication number: 20080245774
    Abstract: The present invention relates to a laser-rotating arc hybrid welding system and a welding method using the system. The laser-rotating arc hybrid welding system of the present invention includes an arc discharge unit (2) for generating arc discharge along an area to be welded. A laser generation unit (4) radiates laser light onto the area to be welded. A rotating device (24) rotates the arc discharge unit (2). In the welding method using the laser-rotating arc hybrid welding system, a plurality of parent metals is aligned with a welding location. A laser-rotating arc hybrid welding system is located with respect to an area to be welded, arc discharge is generated while an arc discharge unit is rotated at a predetermined turning radius, and laser light is subsequently radiated using a laser generation unit.
    Type: Application
    Filed: June 9, 2008
    Publication date: October 9, 2008
    Inventors: Cheol-Hee Kim, Nam-Hyun Kang, Jun-Ki Kim, Chang-Woo Lee