Abstract: Described herein is a single-sided welding head including a first welding electrode and a second welding electrode, where the first and second welding electrodes are carried by a body of said welding head. The first welding electrode is movable relative to the body of said welding head at least along a first coordinate of motion. The second welding electrode is movable relative to the body of said welding head at least along a second coordinate of motion; where said first coordinate of motion is a coordinate of angular motion that develops about a first axis of rotation, and said second coordinate of motion is a coordinate of linear motion that develops along a first axis of translation.

Abstract: A method for manufacturing a hot-stamped steel sheet is provided. The method includes forming a welding portion of one steel sheet of a plurality of steel sheets to be joined. The welding portion has a thickness that is greater than that of a non-welding portion. The method also includes aligning welding portions of the plurality of steel sheets with each other, and joining the plurality of steel sheets by spot welding between the welding portions.

Abstract: An assembly and method of forming the assembly are disclosed. The assembly may include first and second components, the first component including a non-mating region and a mating region. The mating region may have an offset in a direction towards the second component and have a welding surface contacting the second component. A weld located within the welding surface may join the first and second components. The weld may be a laser weld. The method may include positioning a first component including a welding pad offset from a surrounding region of the first component such that the welding pad is in contact with a second component to form a gap between the surrounding region of the first component and the second component. The first component may then be welded to the second component in an area within the welding pad.

Abstract: An electronically-controlled electric resistance welding head and method having a support structure and the electrodes located on the same side. The welding head including a ground electrode having an elastic device and a detecting device for detecting a force load on the elastic device on contact with a component to be welded. A welding electrode is movable relative to the ground electrode and the support structure to contact the component to be welded. An electronic control unit is operable to selectively increase the force applied by each electrode when in contact with the component to be welded until respective threshold values are achieved. Current is generated by a transformer for passage to the electrodes.

Abstract: A welding device of a robot arm includes a welding machine having a first pressing member which includes a cylindrical first pressing part and a second pressing member which includes a second pressing part inserted into a hollow of the first pressing part. A transformer supplies a positive (+) current to the first pressing member and a negative (?) current to the second pressing member. The first and second pressing parts have the same co-axis.

Abstract: A resistance spot welding method can be used to join polymeric and metallic workpieces together and includes the following steps: (a) placing an electrically conductive coating between a polymeric workpiece and a metallic workpiece, wherein the metallic workpiece has a textured surface facing the polymeric workpiece; (b) piercing the polymeric workpiece with first and second electrically conductive pins of a welding electrode assembly; (c) applying electrical energy to the first and second electrically conductive pins so that an electrical current flows through the first electrically conductive pin, the electrically conductive coating, and the second electrically conductive pin in order to at least partially melt the polymeric workpiece and the electrically conductive coating, thereby forming a weld pool; and (d) cooling the weld pool to form a solid weld nugget in order to establish a mechanical interface lock between the solid weld nugget and the textured surface.

Abstract: A technique for welding two dissimilar metal panels or structures together, such as vehicle structures, by providing a sandwich structure between the dissimilar metal structures that includes one skin being made of the same metal as one of the metal structures and an opposing skin being made of the same metal as the other metal structure, and including an electrically non-conducting core between the skins.

Abstract: Provided is a different materials panel structure having reduced occurrence of displacement or warping of a joining section and having excellent external appearance of an outer panel (2). The different materials panel structure has: an outer panel comprising a first metal material; an inner panel (3) arranged on the lower surface side of the outer panel and comprising a second metal material having a higher fusion point than the first metal material; and a rivet (6) comprising the same material as the second metal material and comprising a head section and a shaft section. An outer panel comprises a hemmed section formed by folding a rim section and which supports the inner panel via an adhesive layer (9). The head section of the rivet remains on the outer panel surface. The shaft section of the rivet penetrates from the lower surface side of the hemmed section of the outer panel towards the inner panel.

Abstract: A one-side resistance spot welding method includes a preheating step followed by a welding step. In the preheating step, an electric current having a smaller current value than a welding current is fed from a first electrode to second electrodes such that a substantially annular high-temperature region coaxial with the first electrode and having a higher temperature than neighboring parts is created in a workpiece due to resistance heat generation at a position located near a tip end of the first electrode. In the welding step, the annular high-temperature region forms a shielded current path due to its high electric resistance and serves to guide a welding current from the first electrode to flow into a bottom steel sheet of the workpiece via the shielded current path, thereby allowing the welding current to subsequently advance along the bottom steel sheet and reach the second electrodes via a top steel sheet.

Abstract: A method of single-sided resistance welding includes providing a first workpiece and a second workpiece. The first workpiece is positioned so that at least a portion of the first workpiece is in contact with at least a portion of the second workpiece. A weld electrode is positioned in contact with the first workpiece, and a ground electrode is positioned in contact with the second workpiece. A determination is made as to whether a gap or other high resistance condition is present between the first workpiece and the second workpiece. If a gap or other high resistance condition is determined to be present between the first workpiece and the second workpiece, the gap or other high resistance condition is reduced, and the first workpiece and the second workpiece are joined through welding.

Abstract: A method of welding panels overlapping each other includes a one-directional clamping step that performs one-directional clamping by positioning electrodes of a pair of one-directional spot welding guns with respect to an upper panel and a lower panel overlapping each other, a pressure welding step that forms a plurality of pressure welding portions in a zero gap status by pressure-welding the upper panel to the lower panel in a temporary welding status, by pressing and supplying electricity to the upper panel with the electrodes of the one-directional spot welding guns, plasma spot step that forms a molten portion between the pressure welding portions by performing plasma welding on the pressure welding portions with a plasma welding machine, and a cooling step that forms a welded portion by overlapping the pressure welding portions and the molten portion between the upper panel and the lower panel by cooling the molten portion.

Abstract: A one-side resistance spot welding method includes a preheating step followed by a welding step. In the preheating step, an electric current having a smaller current value than a welding current is fed from a first electrode to second electrodes such that a substantially annular high-temperature region coaxial with the first electrode and having a higher temperature than neighboring parts is created in a workpiece due to resistance heat generation at a position located near a tip end of the first electrode. In the welding step, the annular high-temperature region forms a shielded current path due to its high electric resistance and serves to guide a welding current from the first electrode to flow into a bottom steel sheet of the workpiece via the shielded current path, thereby allowing the welding current to subsequently advance along the bottom steel sheet and reach the second electrodes via a top steel sheet.

Abstract: A one-sided spot welding device having a concentrically arranged weld electrode assembly and an electromagnet for clamping together and holding metallic parts during a one-sided spot welding process. A device of the present invention may include a mounting base having a central weld electrode and an outer, concentrically arranged weld electrode extending therefrom. The outer weld electrode may surround or partially surround the central electrode, with some gap therebetween. The central electrode is associated with an actuator that is provided to press a tip of the central weld electrode against a metal component to be welded. An electromagnet resides between the central and outer weld electrodes of the electrode assembly to draw metal components into tight abutting contact and to hold the components in contact with the outer weld electrode during welding.

Abstract: A projection welding apparatus comprising a first electrode; a second electrode, a first and a second plate members to be welded are provided between the first and second electrodes, the second plate member includes a facing portion and an extension portion extending from the facing portion towards the first plate member and an end face of the extension portion abuts with welding projections provided on the first plate member; a pressing unit causing the second electrode to approach the first electrode, and presses the end face of the extension portion against the welding projections via the second electrode; a voltage application unit causing current to flow in the both plate members; and a stopper member, disposed between the first electrode and the facing portion, is contacted against the facing portion, and electrically connects the facing portion and the first electrode so as to bypass the first plate member.

Abstract: A one-sided spot welding device of the present invention includes a gun body portion including: an upper body disposed at an end of an arm of a robot and a hollow lower body disposed at a lower portion of the upper body; a power supply portion disposed within the lower body, a welding electrode portion i) disposed at a lower side of the lower body, ii) supplied welding power from the power supply portion, and iii) configured to weld welding base metals together by electrical resistance welding; a coated metal band supply portion supplying a coated metal band between the welding base metal and the welding electrode; and a ground electrode portion, electrically connected to the power supply portion and disposed at the other lower side of the lower body for contacting the welding base metal.

Abstract: A method and a device produce a fleece of metallic fibers in a layer in which the metallic fibers are welded to one another to form the fleece. A welding process is repeatedly carried out with regard to a portion or section of the fleece. Such metallic fiber fleeces are used, in particular, for exhaust gas treatment units in the automobile industry.

Abstract: An improved fusion welding system having a heating unit and welding device is adapted for increasing the efficiency of welding a plurality of workpieces. The system preferably presents a single-sided process, and includes first and second electrode wheels operable to heat a portion of the workpieces to a minimum temperature, and a translatable laser cooperatively configured to form a continuous weld within the heated portion. The preferred system provides the advantages of laser welding, such as precision, while enabling weld production at lower laser power outputs or faster welding speeds than conventional laser welding systems.

Abstract: A metal plate and an electrode in a polymer lithium ion secondary battery or the like are welded certainly, and it is accomplished to further improve the reliability and the durability thereof. Each of an upper metal plate (7a) and a lower metal plate (9a) on the positive pole/terminal is welded to a pole/terminal of positive electrode (3) so that the pole/terminal of positive electrode (3) may be sandwiched from each of the upper and lower sides. Moreover, each of an upper metal plate (7b) and a lower metal plate (9b) on the negative pole/terminal is welded to a pole/terminal of negative electrode (5) so that the pole/terminal of negative electrode (5) may be sandwiched from each of the upper and lower sides. This eliminates occurrence of poor welding in the electric resistance welding.

Abstract: A self-contained, or externally actuated, hydraulic log splitter which includes a frame on which is slidably mounted an assembly of a specially designed push plate secured at one end to a reversible hydraulic cylinder and at the other to a splitting table carrying logs which is pushed against a straight blade to split the logs. A plurality of lines of discrete nubs are integrally a part of the push plate along a majority of its entire height and positioned substantially parallel to the straight blade and spaced away from the edge of the push plate. These nubs to provide specialized and improved gripping of log segments as they are split thereby minimizing the tendency of the split log segments to fly away from the splitter. An electric or gas engine driving an hydraulic pump or the hydraulic system of a tractor is connected to drive the reversible hydraulic cylinder.

Abstract: A method of improving a single-sided resistance spot weld includes forming an adhesive bond between a sheet and a tube to thereby form a two-ply structure by which the sheet metal and the tube wall stiffen each other against bending. The adhesive bond is preferably formed by heat curable adhesive and the adhesive is partially cured by applying the electrode to a spot on the sheet and then conducting current through the electrode to induce electric resistance heating in the sheet and tube to cure the adhesive. After the adhesive bond is formed, the electrode is moved to a new spot on the sheet and then forcibly applied against the stiffened sheet and resistance welding current is applied through the electrode to form a resistance spot weld between the stiffened sheet and the stiffened tube wall.

Abstract: An arrangement is provided including an electrode extending to an electrode tip for contacting a workpiece. A welding configuration of the electrode tip is established by exposing the electrode tip to a selected welding environment for use in forming a weld having a target set of weld parameters. An electrode passage is defined in a biasing force arrangement supporting at least a portion of the length of an elongated, flexible electrode and to limit lateral movement sufficient to transfer at least a portion of a resilient force to the electrode tip so that the tip resiliently contacts the weld region. The electrode passage limits induced lateral flexing to an extent which transfers an amount of the resilient force to the first end portion of the electrode that is sufficient to provide for formation of a weld between the support arrangement and the workpiece.

Abstract: In a resistance welding method and a resistance welding apparatus which prevent a decrease in bonding strength between a lead wire and a metal member due to a partially formed current flow path and which immediately removes a defective component from a manufacturing line, a plurality of second welding electrodes in contact with the metal member is provided so as to provide a plurality of current flow paths, and accordingly, to prevent an unevenly distributed current flow. The bonding strength is measured to determine whether it is satisfactory or not on the basis of currents flowing through the second welding electrodes. Also, the electronic component is fixed by the second welding electrodes after resistance welded.

Abstract: Attaching an attachment surface of an electrically conductive workpiece to an electrically conductive support surface is described. In one aspect, a biasing force is distributed at least partially around a weld region of the workpiece to urge the attachment surface of the workpiece against the support surface in a way which at least resists welding induced movement of the workpiece relative to the support arrangement. An electrode arrangement, having an electrode tip, contacts the workpiece to provide for substantially compliant movement of the electrode tip against the weld region in directions that are parallel to the support surface. In another aspect, a combined manipulation/welding arrangement is supported for controlled movement with a free end configured for engaging the workpiece to bias the workpiece against the support surface to manipulate the workpiece against the surface and to conduct an electrical current, while holding the workpiece, for welding to the support surface.

Abstract: An electrode alignment device and weld head for automated welding machines includes a base member, a gap wheel, an electrode holder and a coupling rod. The gap wheel includes a plurality of graduations, where each graduation corresponds to a predetermined electrode spacing for an automated welding process. In one embodiment, the graduations in the gap wheel comprise pairs of apertures, with a first aperture for engaging an alignment post on the base member, and a second aperture for engaging an alignment post on the electrode holder. Among the graduations, the spacing between the first and second apertures is different. As such, the electrode spacing may easily and accurately be changed by disengaging the coupling rod, rotating the gap wheel to the proper graduation, and reengaging the coupling rod.

Abstract: In a series spot welding method, leading edge portions of pressed electrode tips crush bearing surfaces that are one stage higher than a general portion. Thereby, the bearing surfaces are first deformed into a spherical shape. The bearing surfaces thus deformed into the spherical shape are then brought into spot contact with a second steel plate. Thus, the bearing surfaces thus deformed into the spherical shape form a conduction path narrowed down to a spot, between a first steel plate and the second steel plate. Therefore, the density of welding current flowing through the conduction path can be enhanced, and a nugget of sufficient size can be created between the first and second steel plates.

Abstract: A micro-welding electrode which is installed in a welding machine and applied to the electronics industry and spot electric welding industry. The micro-welding electrode includes two integrated electrodes which are made from high-temperature-resistant materials and has a placed insulation between the two electrodes. The insulation between the two parallel electrodes is an insulative chipbonder with the function of agglutination, fixation, insulation and separation, and allows for dispensing with an insulative rivet. Simultaneously, the tip of the two parallel electrodes is positioned into mutual Ohm contact. Not only can the electrode directly weld enameled wires but also has the quality of effectively welding bare wires, sheet metal and metal tapes. The electrode has a simple and reliable construction, is low in production cost, has a good quality of welding and allows for high work efficiency.

Abstract: In a series spot welding method, leading edge portions of pressed electrode tips crush bearing surfaces that are one stage higher than a general portion. Thereby, the bearing surfaces are first deformed into a spherical shape. The bearing surfaces thus deformed into the spherical shape are then brought into spot contact with a second steel plate. Thus, the bearing surfaces thus deformed into the spherical shape form a conduction path narrowed down to a spot, between a first steel plate and the second steel plate. Therefore, the density of welding current flowing through the conduction path can be enhanced, and a nugget of sufficient size can be created between the first and second steel plates.

Abstract: Attaching an attachment surface of an electrically conductive workpiece to an electrically conductive support surface is described. In one aspect, a biasing force is distributed at least partially around a weld region of the workpiece to urge the attachment surface of the workpiece against the support surface in a way which at least resists welding induced movement of the workpiece relative to the support arrangement. An electrode arrangement, having an electrode tip, contacts the workpiece to provide for substantially compliant movement of the electrode tip against the weld region in directions that are parallel to the support surface. In another aspect, a combined manipulation/welding arrangement is supported for controlled movement with a free end configured for engaging the workpiece to bias the workpiece against the support surface to manipulate the workpiece against the surface and to conduct an electrical current, while holding the workpiece, for welding to the support surface.

Abstract: This invention deals with a kind micro-welding electrode which is installed in a welding machine and applied to the electronics industry and spot electric welding industry. The micro-welding electrode comprises two integrated electrodes which are made from high-temperature-resistant materials and has an placed insulation between the two electrodes. The insulation between the two parallel electrodes is an insulative chipbonder with the function of agglutination, fixation, insulction and separation, and allows for dispensing with an insulative rivet. Simultaneously, the tip of the two parallel electrodes is positioned into mutual Ohm contact. Not only can the electrode directly weld enameled wires but also has the quality of effectively welding bare wires, sheets metal and metal tapes. The electrode has a simple and reliable construction, is low in production cost, has a good quality of welding and allows for high work efficiency.

Abstract: The invention concerns a method for assembling electroconductive pass by electric current heating. Said method is characterised in that it consists in moving forward electrodes (10, 20) with different polanties, towards the parts (30, 40) to be assembled, and in contacting said electrodes with at least one of the pans (30) to be assembled, current being applied to said electrodes (10, 20). Thus, the electroconductive pants (30, 40) are locally heated and assembled by the current flowing through them to pass from one electrode to the other.

Abstract: The present invention provides a method for hermetically sealing a semiconductor laser element, by which the cleanness of a package can be maintained extremely satisfactorily in a stabilized state, in order to prevent organic substances from being adhered to the end faces of high output semiconductor laser elements due to photochemical actions. The method comprises the first step of introducing oxygen into a chamber of a hermetical-sealing apparatus and irradiating ultraviolet rays onto an unsealed package having a semiconductor laser element mounted, in the chamber, and the second step of purging the chamber with an inert gas and hermetically sealing an unsealed package in the inert gas atmosphere without being exposed to the outer atmosphere.

Abstract: A welding apparatus provided with lower electrode portions, upper electrode portions, and a cooling water circulation duct which circulates and supplies cooling water to welding electrode pressurizing cylinder guns on the upper electrode portions. A check valve is disposed on an upstream side to the cylinder guns in the cooling water circulation duct. Further, a booster is disposed on a downstream side to the cylinder guns in the cooling water circulation duct, and the cylinder guns are extended for welding by pressurizing the cooling water in the duct from the booster to the check valve through the cylinder guns.