Abstract: A dual-electrode arc welding apparatus includes a body assembly adapted to be coupled to a source of electric power and directing two wire electrodes through a nozzle assembly to an associated workpiece at a working end of the apparatus. The body assembly is provided at a distal end with an adapter which channels the electrodes respectively through passages of a tip assembly in electrical contact with the adapter and the body assembly for conducting electric power to the electrodes. The tip assembly is removable from the adapter without removing the nozzle assembly and, upon removal of the nozzle assembly, the adapter is removable from the body assembly. The tip assembly may include a single tip body with dual passages therethrough or two discrete tips separately mounted on the adapter by either threaded engagement therewith or by being slidably received in externally threaded nipples and secured by collet nuts. Similarly, the adapter may be collet-mounted or threadedly engaged with the body assembly.

Abstract: Apparatus for increasing the permeabilities of central portions of tubular wrappers which form part of successive filter cigarettes of double unit length being turned out by a tipping machine. The central portions of the wrappers include adhesive-coated uniting bands which are convoluted around filter mouthpieces in a first portion of a rolling channel for successive filter cigarettes. A perforating unit which employs laser beams is set up to simultaneously perforate the central portions of the wrappers of several successive cigarettes in a second portion which immediately follows or partially overlaps the first portion of the channel. Each wrapper can be provided with two or more annular arrays of perforations.

Abstract: A process and apparatus for welding a metal component to a metal workpiece. The component typically comprises a metal weld region and a threaded connector region and the apparatus includes a weld head comprising a nozzle for holding the weld region of the component adjacent the workpiece. The weld head induces a weld arc between the weld region of the component and the workpiece to create a weld pool of molten material. The weld head subsequently moves the weld region into the weld pool to permanently join the component to the workpiece. The apparatus further comprises a pressurized fluid source and a fluid flow control means for directing the pressurized fluid between the weld head and the component an weld pool so as to deflect any airborne fluid residue of the weld pool away from the connector region of the component.

Abstract: A gas having an arc current-voltage property that is different from a shielding gas is intermittently added to the shielding gas, an arc current is intermittently changed in proportion to an intermittent chemical composition change of the shielding gas at an arc generation region, and an arc generation point situated at a tip of a welding wire is displaced upwardly or downwardly along a groove of a base metal.

Abstract: The present invention provides a welding system and methodology to facilitate an improved fillet weld. The system includes an arc welding subsystem providing a fillet weld that joins one or more members. The arc welding subsystem controls one or more welding parameters and utilizes one or more controlled process variables, to facilitate geometric control of a toe angle, a toe radius, a throat dimension and a penetration depth associated with the joining of the fillet weld and the one or more members. The present invention also includes optimized welding parameters, welding wire alloys, and welding gas mixtures to promote an improved fillet weld.

Abstract: A method for attaching parts together includes several steps. A metal-core consumable welding wire is obtained in one step. In another step, the parts (such as a ring and a base cup of a cylinder of a damper, such as a vehicle shock absorber) are positioned to create a joint line for welding the parts together. An additional step includes gas metal arc welding the positioned parts together using the metal core wire at a negative electrical welding potential relative to the parts creating a weldment along the joint line. In one example, during welding, the parts have a positive electrical welding potential, and the wire is electrically grounded.

Abstract: Arrangement for improving quality in fusion welding operations where protective gas is supplied to the welding point via a hose line. The arrangement comprises means (5, 6), such as a bypass line connected parallel to the solenoid valve (4) which is usually connected into the protective-gas hose (3), in order make a small flush-gas flow pass through the protective-gas hose (3) or a considerable part of its length, when the normal protective-gas flow is shut off. In this way, the quantity of impurities brought along by the protective-gas flow from the inside of the protective-gas hose (3) and supplied to the pool is reduced.

Abstract: For arc welding a sleeve 3 to a workpiece surface 2, a sleeve holder 1 is surrounded by a field-former unit which contains a magnet coil 4, a magnetic flux return member 6 and a field former 7. A magnetic field is generated with a field component extending radially to the sleeve 3 within the welding gap to set the arc in rotation. To ensure a constant magnetic flux, the field-former unit, in particular its magnet coil 4, is cooled by a temperature-controlled cooling medium circulated through the welding head.

Abstract: The shielding gas mixture is useful for MIG brazing galvanized steel. The gas mixture consists essentially of, by volume percent, about 0.5 to 4 carbon dioxide, about 0.2 to 1 hydrogen, and the balance is argon and incidental impurities.

Abstract: The invention concerns a method for welding one or several metal components to be assembled by producing at least one weld joint on said metal components to be welded, said weld joint being obtained by using a laser beam and at least an electric arc, which consists in generating said laser beam using a power-diode laser device. The invention also concerns an installation for implementing the welding method. The invention is useful for welding abutted flanks designed to constitute at least part of a motor vehicle body component.

Abstract: This device significantly reduces major reasons for shielding gas waste primarily in metal inert gas welding. Excess shielding gas stored at the end of each weld in the shielding gas delivery hose connecting the gas source to the welding machine creates a shielding gas flow-surge at the next weld start. This gas flow-surge creates shielding gas waste and can cause poor weld start performance. Other methods employed over the years to reduce shielding gas waste have been either complex, leaked, were not sufficiently robust for the environment, provided only partial solutions or did not provide shielding gas savings for welds longer than about 3 seconds. This device includes a delivery hose connecting the shielding gas supply to the welding machine, which has a small internal volume and a gas surge-restricting orifice at the gas solenoid end of the hose.

Abstract: A core composition of a metal-cored wire comprising a combination of graphite and potassium compounds has been proven to stabilize the arc in a straight polarity welding configuration. In particular, adding a combination of graphite and potassium manganese titanate (K2MnTiO4) and potassium sulfate (K2SO4) in the preferred combination of graphite and potassium compounds from the range of about 0.3% to about 5.0% wt resulted in a greatly stabilized arc, reduced spatter and reduced warpage while maintaining high deposition rates of the DCEN welding process.

Abstract: Process for making heterogeneous joints under shielding gas In joining heterogeneous materials that differ in their melting points, a shielding gas mixture with active gas content is utilized. In particular, the shielding gas mixture contains helium and active gasses in the vpm range (0.005 to 0.5% by volume). These shielding gases to lead to the production of high quality joints when joining aluminum and steel.

Abstract: Process for the MIG welding of nickel and nickel alloys, with the use of a gas shield for at least part of the welding zone, in which process the gas shield is a gas mixture containing from 0.05% to 0.5% CO2, the balance being argon. Advantageously, the gas mixture also contains, by volume, from 15 to 50% helium, preferably from 17% to 30% helium, or from 0.1% to 10% hydrogen by volume and preferably from 1% to 7% hydrogen by volume.

Abstract: For MIG welding, either in a spray mode without current modulation or in a pulsed mode, of aluminum and aluminum alloys, with the use of a gas shield for at least part of the welding zone, the gas shield is a gas mixture consisting, by volume, of from 0.01% to 1.80% oxygen and from 15% to 98.2% helium, and any balance being argon.

Abstract: An improved welding apparatus, for use with a MIG apparatus, or a tungsten rod in a TIG apparatus. A nozzle housing, having an outer shroud, defines an airspace, which receives an injection of water vapor mist. The water vapor mist, when directed into the airspace in the nozzle housing, contacts the heated nozzle housing surface, and is then able to absorb the heat energy from the nozzle housing surface. When the water vapor mist absorbs heat energy, it undergoes a phase change from atomized water into steam. The steam is allowed to exit out of the rear portion of the rear of the nozzle assembly. The phase change of water to steam provides a significant heat transfer, due to the latent heat energy absorption capability of the water that is required to convert it from a liquid state to a gaseous state. This cooling apparatus, and method of cooling, both utilize a minimal amount of water usage, and also dramatically extends the usable life of the welding apparatus.

Abstract: Stainless steels are welded using a shielding gas including 88 to 98.9 mole % Ar, 1 to 10 mole % H2, and 0.1 to 2.0 mole % CO2. The shielding gas permits low sulfur, high chromium, austenitic stainless steel pipes to be joined with welds having sufficient penetration, strength, corrosion resistance and durability for practical use.

Abstract: A method and apparatus for welding that includes a power source and a wire feeder is disclosed. One or more sensors sense one or more welding conditions before the weld is initiated. A set up circuit is coupled to sensor, the power source, and the wire feeder. The set up circuit automatically sets up the welding machine in response to what the sensor senses. The sensor may be a wire sensor, including a diameter sensor and a material sensor, a gas sensor (if a source of gas is included) such as a cyclic voltametry gas microsensor, a workpiece thickness sensor such as a strain gauge or displacement sensor. Alternatively the sensor includes a bar code reader that reads a code on, for example, the spool of wire, an analog proximity detector, a plurality of proximity detectors, and a displacement sensor.

Abstract: Welding of material such as a piping using ferrite system stainless steel, in which a back sealed gas used for conventional welding is switched from argon gas (or a hydrogen gas/argon gas mix) to an argon gas to which an oxidizing gas is doped at the time of forming a chromium oxide passivation film. Welding conditions are set at the temperature in which the inner surface of the piping does not melt at the time of forming the chromium oxide passivation film. The temperature of the welding piping is set uniformly between welding conditions in conventional welding and welding conditions at the time of forming the chromium oxide passivation film, and in order to replace gases used with conventional welding with gases used at the time of forming the chromium oxide passivation film. A cycle of one round or more is performed under the welding conditions for forming a chromium oxide passivation film, thereby, to form the chromium oxide passivation film on a weld in concurrence with welding.

Abstract: It is an object of the present invention to provide, in the double wire type welding method, a consumable electrode type arc welding method and welding apparatus for which the welding speed is sufficiently increased, and in particular the melting of steel such as carbon steel is increased and hence the welding speed is increased.

Abstract: An arc welding apparatus comprising a combination of a teaching-playback robot and an arc welding power source is provided. Even when, in changing a welding method, one welding power source for one welding method is replaced by another welding power source for another welding method, the welding apparatus does not require an adjustment between a robot controller and the latter arc welding power source for consistency between them. The arc welding apparatus comprises a teaching-playback robot comprising a robot body and a robot controller and a welding power source including a controller. The robot controller and the controller of the welding power source both have a communication controller, and communicate with each other using a digital signal. On the basis of information on the welding method transmitted from the welding power source, the welding method is automatically set into the robot controller.

Abstract: Gas shielded arc welding is performed using gas nozzle 10 which includes a straight portion 14 that permits the shielding gas flows from orifices 18 to flow parallel to the axial direction and a constricted portion 20 continuous from the straight portion 14 that constricts the gas flows from the straight portion 14 as they travel toward the distal end and the nozzle 10 satisfies the following relations (1) and (2): 1.5≦(Dp/Do)≦2.5  (1) 1.0≦(L/Dp)  (2) where Dp is the inside diameter of the straight portion 14, Do is the inside diameter of the distal gas outlet of the constricted portion 20, and L is the axial length of the constricted portion 20.

Abstract: A blow feed weld gun for welding a nut to a metal substrate is disclosed. The blow feed weld gun has an air feed mechanism and a nut drive mechanism. The nut drive mechanism contains a primary piston assembly located within a cylindrical working chamber. The primary piston assembly is coupled to a first driven piston which is hollow and defines a passage which welding gasses and/or air can be delivered to the threads of a threaded weld nut.

Abstract: The mechanism which is the subject of this patent application is centered on a control device adapted to facilitate the control and regulation of the electrical current or the gaseous intake and mixture for a welding machine, thereby regulating the output of the welding machine, such mechanism including a foot-operated pedal member, which, in turn, is mechanically linked to electro-mechanical means activated by radio transmission means to regulate such electrical current input or the gaseous output.

Abstract: A gas lens assembly for use in a gas shielded welding torch to provide laminar gas flow to the weld puddle. The assembly includes a plurality of annular fine mesh inner filter screens mounted in fixed axially spaced disposition in a gas chamber formed between the lens body and lens sleeve. The filter screens are preferably spaced apart a predetermined distance by a plurality of wave-shaped open mesh spacer discs disposed in a sandwich configuration between the filter screens. A stack of adjacently disposed outer filter screens are mounted in the gas chamber outwardly of the fine mesh filter screens. Each of the outer screens in the stack is individually removable such that the outermost screen can be readily peeled from the stack when damaged by spatter or heat to maintain the laminar gas flow through the assembly and prolong the useful life of the assembly.

Abstract: An improved method for welding and passivation forms a chromium oxide passivated film over the welded portion during the welding process. In a shielding step, a backshield gas, preferably argon, is flowed around the welding site. In a welding step, an arc gas, preferably argon with approximately 10% hydrogen and less than 1 ppm moisture content, is flowed through the welding head and a welded joint is formed, for example by high speed tungsten-inert gas (TIG) orbital welding. In the passivation step, a process gas, preferably argon with approximately 30-100 ppm of oxygen and less than 1 ppm moisture content, and preferably less than 1 ppb moisture content, is flowed over the welded portion to form a chromium oxide passivated film on the welded portion. The process gas is passed through a gas purifier prior to being flowed over the welded portion to maintain its moisture level at less than 1 ppb.

Abstract: The present invention provides a means of saving a significant amount of shielding gas, primarily in the metal inert gas (MIG) welding process. The invention significantly reduces a major reason for shielding gas waste, which is excess shielding gas storage in the hose connecting the shielding gas source to the welding machine. Other methods employed over the years to achieve the objective of reducing shielding gas waste have been complex, subject to leaks or were not sufficiently robust for the environment in which they are used therefore are not widely employed. The present invention consists of a hose connecting the shielding gas supply to the welding machine, which has a small internal volume. The outside diameter of the shielding gas delivery hose is sufficiently large and robust to provide satisfactory service in a welding fabricating environment.

Abstract: The shielding gas mixture is useful for MIG brazing galvanized steel. The gas mixture consists essentially of, by volume percent, about 0.5 to 4 carbon dioxide, about 0.2 to 1 hydrogen, and the balance is argon and incidental impurities.

Abstract: An electric arc welder powered by a plurality of liquid organic fuel cells. The fuel cells use a methanol/water mixture as the organic feed. The fuel cells produce carbon dioxide as a reactive product which is used an a shielding gas during the arc welding process. The fuel cells are stacked together to produce the desired arc voltage and current between an electrode and the workpiece. The arc welder includes a welding current to control the current wave shape through the electrode and to control or increase the voltage through the electrode.

Abstract: A shroud for a welding torch includes a hydrophilic skirt supported by a frame. The skirt is soft and pliable when wet and is self protected from the heat of welding by the water absorbed therein. The frame supports the skirt around the weld site and permits a good seal with the workpiece for excluding water during the welding process.

Abstract: The invention relates to a shielding gas for gas shielded metal-arc welding or gas shielded metal-arc soldering with multiple (in particular 2) wire electrodes. According to the invention, it contains helium.

Abstract: A torch head having a base section, a tip section and three or more radial rods connected between the base section and the tip section. The radial rods form a generally circular inner chamber which inner chamber includes an electrode. One or more of the radial rods has an inner passageway to convey one or more shielding gasses and/or one or more cooling fluids from the base section to the tip section of the torch head. The cooling fluid cools at least a portion of the torch head. The shielding gas is directed about the electrode and onto the weld metal to improve the quality of the weld bead. One or more of the radial rods function as support structures to enhance the strength and the rigidity of the torch head. The tip section of the torch head is designed to direct the one or more shielding gas in a desired profile about the electrode and onto the weld metal. The tip section includes an electrical contact that form an electrical connection with the electrode as the electrode passes through the tip section.

Abstract: The mechanism which is the subject of this patent application is centered on a control device adapted to facilitate the control and regulation of the electrical current or the gaseous intake and mixture for a welding machine, thereby regulating the output of the welding machine, such mechanism including a foot-operated pedal member, which, in turn, is mechanically linked to electromechanical means activated by radio transmission means to regulate such electrical current input or the gaseous output.

Abstract: The present invention provides a fixing structure for a welding electrode and a welding head which enable improvement of durability of a welding electrode, improvement of work efficiency in welding, and reduction of time required for welding and also which make it possible to execute welding for a long time with high reliability. In this fixing structure, a fixed section of a welding electrode is inserted via a thermally conductive material into an inserting section of a fixing base and a peripheral surface of the fixed section of the welding electrode is uniformly contacted to the fixing base to fix the welding electrode to the fixing base.

Abstract: An inner torch for the electric-arc spraying of cavities, in particular of cylinder contact surfaces. The inner torch as at least two torch tubes for heating electrodes. The electrodes are provided for melting purposes and are designed as wires which can be burned away in an electric arc. The inner torch also has a gas feed for a process gas which is provided for transporting and spraying the molten wire material in the direction of the cavity surface which is to be coated. The wires are guided towards one another, by way of the torch tubes, wherein at the outlet and in the region of the electric arc, the electric arc of the electrodes wires, which is arranged in the contact region of the wires, is arranged in the region of the flow of the discharged process has, referred as the main gas arranged transversely to the main transporting direction of the wires. Furthermore, in addition to being bent towards one another, the wires are also bent transversely to this direction.

Abstract: Realized is a welding wire containing flux used for a gas shielded arc welding of a direct current/positive polarity mode, with use of which a quantity of sputter generated is small, a good weldability is realized and a weld metal with an excellent toughness is obtained in all the welding positions under application of a welding current in the range of a low current to a medium current, or in a definite manner in the range of 50 to 300 A. The flux contains 0.7 to 3 wt % Al, 0.1 to 1.0 wt % Mg and 1.2 to 5 wt % BaF2, each content being a value in wt % to a total weight of the wire and the sum of a content of Al plus a content of Mg multiplied by 3 being in the range of 1.3 to 5 wt %, a filling ratio of the flux to the total weight of the wire is in the range of 5 to 30 wt %, a total Mn content in a steel sheath and the flux combined is in the range of 0.2 to 1.9 wt % and a total Si content in the steel sheath and the flux combined in the range of 0.001 to 0.9 wt %.

Abstract: The invention relates to a process and a unit for the MIG welding of aluminum and its alloys, employing gaseous shielding of the welded zone, composed of a central flow of gas consisting of argon and/or oxygen and of a peripheral gas stream consisting of argon or a mixture of argon and helium. The MIG welding process of the invention allows effective welding of workpieces made of aluminum or aluminum alloys by improving the penetration of the weld and the wetting of the weld bead, that is to say the angle of connection of the weld bead to the welded workpieces.

Abstract: A pressure sensor is arranged to sense the pressure of a pressurized welding gas and produce a variable control output dependent upon the pressure level sensed. A control signal is initiated in response to pressure of a predetermined level being sensed, the control signal being passed to the welding apparatus driver circuitry to inhibit the welding operation.

Abstract: The process includes shielding of at least part of the welding zone with a gas mixture consisting of 1.2 to 1.70% oxygen and the balance being argon.

Abstract: A welding torch comprises a torch body having a wire guide cylinder for guiding a welding wire; an internal cylinder fitted to the torch body in such a manner as to surround the wire guide cylinder; and an external cylinder fitted to the internal cylinder in such a manner as to surround the internal cylinder. The primary interception of outside air is effected with a second shielding gas layer blown off from a second gas passageway on the outer side, and the complete interception of outside air is effected with a first shielding gas layer blown off from a first gas passageway on the inner side. Consequently, it is made possible thereby to sufficiently prevent outside air from reaching a molten pool and also sufficiently suppress the generation of an unfavorable surface oxide, thus enabling welding work to be satisfactorily practiced by using the above welding torch.

Abstract: The present invention relates to a device for performing welding operations, comprising: a core member in which can be guided a welding wire connectable to a voltage source; an extraction member arranged on the outside of the core member for extracting substances inconvenient to the welder; a gas supply member arranged on the outside of the extraction member for supplying gas. The invention also relates to an assembly for welding a weldment, comprising: a device as claimed in any of the claims 1-9, welding wire supply means for supplying welding wire; gas supply means for supplying gas via the gas supply member; a voltage source for applying electrical voltage between the welding wire and the weldment; pumping means for exhausting substances inconvenient to the welder via the extraction member.

Abstract: A stainless steel pipe which prevents a gas supplied through the pipe from being contaminated so as to maintain high degree of purity, the stainless steel pipe having a superior corrosion resistance so appropriate as to supply the gas for manufacturing semiconductors. According to the present invention, there are provided a stainless steel pipe and a joining method thereof regarding joining by butt welding, the stainless steel pipe comprising a joining portion 1 having a butt joining portion 2, the butt joining portion having an outer butt joining portion 2a in an outer wall surface portion 3 joined by a butt welding with penetration welding portion W and, an inner butt joining portion 2b in an inner wall surface portion joined in solid-state without being melted, such that the joining portion comprises the butt joining portion joined by the butt welding with partial penetration.

Abstract: The invention relates to a process for the MIG welding, in spray mode without current modulation or in pulsed mode, of aluminum and aluminum alloys, with the use of a gas shield for at least part of the welding zone. According to the process of the invention, the gas shield is a gas mixture consisting, by volume, of from 0.8% to 1.80% oxygen and from 15% to 99.99% helium, and possibly containing a balance of argon. Preferably, the gas mixture contains at least 1% oxygen.

Abstract: An electric arc welder powered by a plurality of liquid organic fuel cells. The fuel cells use a methanol/water mixture as the organic feed. The fuel cells produce carbon dioxide as a reactive product which is used an a shielding gas during the arc welding process. The fuel cells are stacked together to produce the desired arc voltage and current between an electrode and the workpiece. The arc welder includes a welding current to control the current wave shape through the electrode and to control or increase the voltage through the electrode.

Abstract: Gas shielded arc welding is performed using gas nozzle 10 which comprises a straight portion 14 that permits the shielding gas flows from orifices 18 to flow parallel to the axial direction and a constricted portion 20 continuous from the straight portion 14 that constricts the gas flows from the straight portion 14 as they travel toward the distal end and the nozzle 10 satisfies the following relations (1) and (2):

Abstract: A method of welding reinforcement steel bars (rebar) and assembly of fusion-welded rebar into panel assemblies that are self-stabilizing to withstand the rigors of transport to and positioning within construction sites. The rebar welding method generates fusion welds in such a manner that the weld imparts stability and strength to the welded rebar assemblies. The rebar welds permit the assembling of larger and more varied rebar panel configurations without the need for tie wire or other coupling devices. Further, the welded panels allow positioning of large rebar configurations, insuring that the spacing of the individual bars exceeds all required tolerances. The self-stabilizing fusion rebar welding process allows a more efficient, flexible and rapid method of rebar panel construction by using assembly systems on mobilized trailers or at stationary locations.

Abstract: Process for welding one or more metal workpieces to be joined together by producing at least one welded joint between the edges to be welded of the said metal workpiece or workpieces, the said welded joint being obtained by using at least one laser beam and at least one electric arc, in which process, during welding of the joint, at least one part of the welding zone comprising at least one part of said welded joint is shielded during the operation with at least one shielding atmosphere formed by a gas mixture consisting of argon and/or helium with a content greater than or equal to 70% by volume; and at least one additional compound chosen from H2, O2, CO2 and N2 with a content of 0 to 30% by volume.

Abstract: A Multi-Electrode Welding System for performing high-precision welding and joining is disclosed. One embodiment of the invention comprises a sealed chamber (13) which is enclosed by a weld head frame (11), a removable lid (12) and a chamber base (14). A generally tubular workpiece (not shown) is placed in a pair of semi-annular inserts (16) and extends into the sealed chamber (13), which is filled with an inert gas. In one embodiment, a weld head rotor (18) revolves around the longitudinal axis defined by the workpiece, and controls the motion of an inside electrode (24A) and an outside electrode (24B), which are held by inside and outside electrode holders (20 & 22). Arc welding is performed by the electrodes (24A & 24B) as they revolve around the workpiece. Inside and outside welding may be performed simultaneously. The invention provides for precise control of the relative position of the electrodes, allowing one electrode to trail the other.

Abstract: A metal material is formed into a wire material, and an end of the wire material is molten by an electric discharge. A molten sphere formed by the melting of the end is flied by a gas flow. Thus, a material having a high melting point can be ejected.

Abstract: An electric arc welder powered by a plurality of liquid organic fuel cells. The fuel cells use a methanol/water mixture as the organic feed. The fuel cells produce carbon dioxide as a reactive product which is used an a shielding gas during the arc welding process. The fuel cells are stacked together to produce the desired arc voltage and current between an electrode and the workpiece. The arc welder includes a welding current to control the current wave shape through the electrode and to control or increase the voltage through the electrode.