38results about "Pressure electrodes" patented technology

The invention relates to a spot welding clamp (1) comprising a lower welding arm (12) carrying a first electrode support (121) and a first electrode (122), and an upper welding arm (11) carrying a second electrode support (111) and a second electrode (112) for performing a spot welding between a first sheet metal part and a second sheet metal part by bringing the first electrode (122) into contact with the first sheet metal part and the second electrode (112) into contact with the second sheet metal part, the second electrode support (111) comprising an internal passage path for a heat transfer fluid intended to evacuate the thermal energy which accumulates in the second electrode (112) during the welding phases,the upper welding arm (11) comprising an internal supply conduit (111A) for heat transfer fluid to the internal fluid passage path of the second electrode support (111) and a discharge conduit (112A) for heat transfer fluid coming from said internal heat transfer fluid passage path, the second electrode support (111) being mounted in an adjustable manner on the upper welding arm (11), and in that it comprises a rigid fluid connection element (13) secured to the upper welding arm (11).,

A spot welding assembly for welding a first work piece to a second work piece. The spot welding assembly includes a base. A base electrode is coupled with the base for supporting the first work piece. A welding gun is moveable toward and away from the base. A gun electrode is coupled with the welding gun for supporting the second work piece and for locating the second work piece against the first work piece upon movement of the welding gun toward the base to allow the first and second work pieces to be welded to one another. The base electrode is rotatable and pivotable relative to the base, and the gun electrode is rotatable and pivotable relative to the welding gun.

The present disclosure provides a concentric electrode. The concentric electrode includes a cylindrical base and a tip disposed on the cylindrical base. The cylindrical base extends in the axial direction of the rotating shaft, and the cylindrical base comprises conductive metal. The tip includes a concentric surface extending axially from the cylindrical base and defined by an outer shoulder having an outer diameter and an inner shoulder having an inner diameter. The tip is configured to provide an electrical current to the steel workpiece and remove a coating from at least a portion of the steel workpiece.

Disclosed is a welding apparatus including an upper welding unit including an upper welding rod, a first object to be joined located under the upper welding rod, a second object to be joined located under the first object to be joined, and a lower welding unit including a lower welding rod located under the second object to be joined, wherein the first object to be joined and the second object to be joined are welded to each other by resistance welding using the upper welding rod and the lower welding rod, and a displacement measurement unit configured to measure the displacement of a buffer portion provided on at least one of an upper end of the upper welding rod or a lower end of the lower welding rod by further pressing in the state in which the upper welding rod, the first object to be joined, the second object to be joined, and the lower welding rod face each other in tight contact with each other.

In the coolant drip prevention system (1), one end of the first pipe (4) is connected to a coolant supply pipe (15) on the side of the welding torch (11) with respect to the first stop valve (2). One end of the second pipe (5) is connected to a coolant discharge pipe (16) on the side of the welding torch (11) with respect to the second stop valve (3). One end of the discharge pipe (6) is connected to the coolant discharge pipe (16) on the side away from the welding torch (11) with respect to the second stop valve (3). The pump unit (7) discharges the coolant sucked from the first pipe (4) and the second pipe (5) into the discharge pipe (6).

The invention relates to a resistance welding apparatus comprising a clamp (1) intended to support an arm comprising a first part (1A) supporting a fixed electrode (2) and a second part (1B) supporting a movable electrode (3) in translation, the electrodes (2, 3) being intended to be traversed by an electric current and to grip metal elements to weld them, the movable electrode (3) being configured to move between a working position (P0) in which the electrodes (2, 3) grip the metal elements to be welded and two opening positions allowing the metal elements to be welded to be inserted between the electrodes (2, 3) arranged opposite one another.

A drive mechanism is capable of moving an electrode relatively to a pressurization shaft in an axial direction. The drive mechanism includes a cylinder and a piston. The cylinder is fixed to the pressurization shaft as surrounding the pressurization shaft and provided with an inner circumferential surface that extends along the axial direction. The piston is accommodated in the cylinder while it is connected to the electrode, and driven by a pressure of fluid. The piston partitions an internal space in the cylinder into a first chamber and a second chamber. As fluid alternately goes in and out of the first chamber and the second chamber, the piston is driven in the axial direction while it slides with respect to the inner circumferential surface, and the electrode is movable in the axial direction together with the piston.

The spot welding electrode has an active surface (14) for contact with a part to be welded (4, 6), wherein the active surface (14) is convex and profiled along a longitudinal axis (A).

The application discloses an electrode cap for resistance spot welding, which comprises a front end part, a trunk part and a transition part. The front end part is the part that first contacts the material to be welded during welding, and the outer arc surface of the front end part is formed by rotating a preset circular arc as a generatrix and taking the central axis of the electrode cap as a rotation center. The bottom of the trunk part is provided with a cavity, and the electrode cap is assembled with an electrode rod through the cavity. The outer cylindrical surface of the trunk part is formed by rotating a preset straight line as a generatrix and taking the central axis of the electrode cap as a rotation center. One end of the transition part is connected with the front end part, and the other end of the transition part is connected with the top of the trunk part. The outer arc surface of the transition part is formed by rotating a preset arc line as a generatrix and taking the central axis of the electrode cap as a rotation center, and the preset circular arc and the preset arc line are tangent. The application solves the technical problem of brittle cracks of liquid metal in the welding joint.

A spot-welded joint has a first workpiece (1), a second workpiece (2), and a weld nugget used for fixedly connecting the first workpiece (1) and the second workpiece (2). At least one of the outer surface of the first workpiece (1) and the outer surface of the second workpiece (2) includes a basic surface and an indentation. The indentation has a first surface located in the center and protrudes outwards and a second surface located on the periphery of the first surface and recessed inwardly. The maximum distance h1 between the first surface and the basic surface is smaller than the maximum distance h2 between the second surface and the basic surface. The edge welding of the spot-welded joint is firmer, and the center is thinner, so that the generation of surface cracks and the formation of internal defects are reduced, thereby improving the welding spot strength.

A resistance welding device welds a plurality of stacked welding target members of a workpiece by pressurizing the workpiece and supplying power to the workpiece. The resistance welding device includes at least one electrode that has a tip end surface configured to be in contact with the workpiece and that is configured to pressurize the workpiece and supply power to the workpiece. The electrode has, at an intermediate portion between the tip end surface and a base end of the electrode, at least one slit that opens to an outer circumferential surface of the electrode and that extends in a circumferential direction in a plane intersecting a central axis direction of the electrode.

TITLE: Welding apparatus comprising an arm with a moving electrode. The invention relates to a resistance welding apparatus comprising a clamp (1) for supporting an arm having a first part (1A) supporting a fixed electrode (2) and a second part (1B) supporting a moving electrode (3), the electrodes (2, 3) being designed to carry an electric current and to grip metal elements for welding, the moving electrode (3) being configured to move between a working position (P0) in which the electrodes (2, 3) grip the metal elements to be welded and two open positions allowing the metal elements to be inserted between the electrodes (2, 3) arranged opposite each other. Abstract figure: [Fig. 1]

Welding electrode arrangement with: a first welding electrode (16), comprising: a body (20); and a weld surface (22) for pressing against a first side (84) of a workpiece stack arrangement (80) supported by an end of the body (20), wherein the weld surface (22) comprises a central upright plateau (40) with a plateau surface (52) and a convex dome section (42) surrounding the central upright plateau (40); and a second welding electrode (18), comprising: a welding surface (26) for pressing against a second side (86) of the workpiece stack arrangement (80), wherein the welding surface (26) of the second welding electrode (18) is aligned with the welding surface (22) of the first welding electrode (16) when the welding surfaces (22, 26) of the first and second welding electrodes (16, 18) are pressed against the respective first and second sides (84, 86) of the workpiece stack arrangement (80); wherein the welding surface (26) of the second welding electrode (18) comprises a convex basic welding surface (58) and a plurality of upright circular ribs (60) projecting outwards from the convex basic welding surface (58), such that the upright circular ribs (60) are separated by intervening circular sections (62) of the convex basic welding surface (58); characterized by the fact that the convex dome section (42) of the welding surface (22) of the body (20) of the first welding electrode (16) further comprises a base surface (44) and a plurality of trapezoidal welding surface sections (46) spaced circumferentially on the base surface (44) around the central upright plateau (40), each of the trapezoidal welding surface sections (44) comprising a plurality of transversely directed, upright, curved ribs (48) spaced radially apart along the base surface (44) of the convex dome section (42); wherein a plurality of radial slots (56) communicate with an annular channel surrounding the central upright plateau (40) and extend outwards in the direction of an outer circumference of the base surface (44) of the convex dome section (42), each of the plurality of radial slots (56) extending between two adjacent trapezoidal weld surface sections (44); wherein the diameter of the innermost upright circular rib (60') of the welding surface (26) of the second welding electrode (18) is smaller than the diameter of the plateau surface (52) of the central upright plateau (40) of the welding surface (22) of the first welding electrode (16).

A metal joined body has an iron base body and an aluminum base body that are joined together via a joint layer. The joint layer has a first layer composed of a first intermetallic compound formed on the iron base body side and a second layer composed of a second intermetallic compound formed on the aluminum base body side. The first layer has one or more first protrusions that merge integrally into the iron base body and extend in a pile shape into the first intermetallic compound. The second layer may have one or more second protrusions that are composed of a second intermetallic compound and extend in a columnar shape into the aluminum base body. The first intermetallic compound may contain Al5Fe2, and the second intermetallic compound may contain Al3Fe. The total thickness of the first layer and the second layer is, for example, 2 to 15 μm.

A concentric electrode is provided. The concentric electrode includes a cylindrical base and a tip disposed on the cylindrical base. The cylindrical base extends axially along an axis of rotation, and the cylindrical base includes a conductive metal. The tip includes a concentric surface extending axially from the cylindrical base and defined by an outer shoulder having an outside diameter and an inner shoulder having an inside diameter. The tip is configured to provide an electrical current to a steel workpiece and purge a coating from at least a portion of the steel workpiece.

Wear electrode for resistance projection welding of bolts (9), with - an electrode body (5) which has an opening (12) for inserting a bolt (9), - a receptacle (24) formed in the electrode body (5), - wherein a sleeve (6) is received in the receptacle (24), characterized in that - that the wear electrode has a clamping element (7) which engages in threaded engagement with the electrode body (5) so that it can clamp the sleeve (6) against the electrode body (5).

The present invention relates to a welding apparatus comprising an upper welding section including an upper welding rod, a first workpiece located below the upper welding rod, a second workpiece located below the first workpiece, and a lower welding section including a lower welding rod located below the second workpiece, wherein the first workpiece and the second workpiece are welded by resistance welding of the upper welding rod and the lower welding rod, and the welding apparatus is equipped with a displacement measuring unit that can measure the displacement of a buffer portion provided at least one of the upper end of the upper welding rod or the lower end of the lower welding rod by additional pressing while the upper welding rod, the first workpiece, the second workpiece, and the lower welding rod are in close contact and facing each other.

The present disclosure provides a resistance spot welding method and a resistance spot welding device capable of suppressing cracks in a high tensile strength steel sheet without being limited by the material. The resistance spot welding method according to one aspect of the present disclosure includes a welding process of welding a workpiece made of a plurality of steel sheets by a resistance spot welding device. The resistance spot welding device includes a first electrode in contact with a first steel sheet, the first steel sheet being a high tensile strength steel sheet among the plurality of steel sheets, and a second electrode in contact with a second steel sheet and sandwiching the workpiece together with the first electrode, the second steel sheet being a steel sheet having a tensile strength lower than that of the first steel sheet among the plurality of steel sheets. In the welding process, the first steel sheet is compressed in a direction intersecting a thickness direction of the first steel sheet at least from a start of welding of the workpiece to an end of the welding of the workpiece.

The pressure applied to the electrodes can be easily changed. [Solution] The solid-phase resistance spot bonding apparatus 1 comprises a pressurizing shaft 100, an electrode 110, and a drive mechanism 120. The drive mechanism 120 is capable of moving the electrode 110 relative to the pressurizing shaft 100 in the axial direction. The drive mechanism 120 includes a cylinder 130 and a piston 140. The cylinder 130 is fixed to the pressurizing shaft 100 so as to surround the pressurizing shaft 100 and has an inner circumferential surface 135 extending along the axial direction. The piston 140 is housed in the cylinder 130 while being connected to the electrode 110 and is driven by fluid pressure. The piston 140 divides the internal space of the cylinder 130 into a first chamber 11 and a second chamber 12. As fluid alternately enters and exits the first chamber 11 and the second chamber 12, the piston 140 is driven axially while sliding against the inner circumferential surface 135, thereby enabling the electrode 110 to move axially together with the piston 140.

The invention relates to a resistance welding apparatus comprising a clamp (1) intended to support an arm comprising a first part (1A) supporting a fixed electrode (2) and a second part (1B) supporting a movable electrode (3) in translation, the electrodes (2, 3) being intended to be traversed by an electric current and to grip metal elements to weld them, the movable electrode (3) being configured to move between a working position (P0) in which the electrodes (2, 3) grip the metal elements to be welded and two opening positions allowing the metal elements to be welded to be inserted between the electrodes (2, 3) arranged opposite one another.

A drive mechanism (120) is capable of moving an electrode (110) relatively to a pressurization shaft (100) in an axial direction. The drive mechanism (120) includes a cylinder (130) and a piston (140). The cylinder (130) is fixed to the pressurization shaft (100) as surrounding the pressurization shaft (100) and provided with an inner circumferential surface (135) that extends along the axial direction. The piston (140) is accommodated in the cylinder (130) while it is connected to the electrode (110), and driven by a pressure of fluid. The piston (140) partitions an internal space in the cylinder (130) into a first chamber (11) and a second chamber (12). As fluid alternately goes in and out of the first chamber (11) and the second chamber (12), the piston (140) is driven in the axial direction while it slides with respect to the inner circumferential surface (135), and the electrode (110) is movable in the axial direction together with the piston (140).

A concentric electrode is provided. The concentric electrode comprises a cylindrical base and a tip located on the cylindrical base. The cylindrical base extends axially along an axis of rotation and contains a conductive metal. The tip comprises a concentric surface extending axially from the cylindrical base and defined by an outer shoulder with an outer diameter and an inner shoulder with an inner diameter. The tip is configured to deliver an electric current to a steel workpiece and to remove a coating from at least one section of the steel workpiece.

A resistance welding device welds a plurality of stacked welding target members (101 and 102) of a workpiece (100) by pressurizing the workpiece and supplying power to the workpiece. The resistance welding device includes at least one electrode (2) that has a tip end surface (211) configured to be in contact with the workpiece and that is configured to pressurize the workpiece and supply power to the workpiece. The electrode has, at an intermediate portion between the tip end surface and a base end of the electrode, at least one slit (41 to 44) that opens to an outer circumferential surface of the electrode and that extends in a circumferential direction in a plane intersecting a central axis (X) direction of the electrode.

The present invention provides a solid-phase resistance spot bonding device capable of easily changing the pressure applied to an electrode. This solid-phase resistance spot bonding device is provided with a pressing shaft, an electrode, and a drive mechanism. The drive mechanism is capable of moving the electrode relative to the pressing shaft in the axial direction. The driving mechanism comprises a working cylinder and a piston. The cylinder is fixed to the pressurizing shaft so as to surround the pressurizing shaft, and has an inner peripheral surface extending in the axial direction. The piston is connected to the electrode, is housed in the cylinder, and is driven by the pressure of the fluid. The piston divides the internal space of the cylinder into a first chamber and a second chamber. The fluid alternately enters and exits the first chamber and the second chamber, so that the piston slides relative to the inner circumferential surface and is driven in the axial direction, thereby enabling the electrode to move together with the piston in the axial direction.

A welding method and a welding apparatus using the same control heat emission amounts of interfaces of a welding subject to be similar by adjusting cross-sectional areas of two welding tips arranged on both outer facing surfaces of a panel type welding subject, superimposed in multi-layers, to simultaneously form a nugget diameter.

An electric spot-welding head (10) for a multi-axis industrial robot arm is described, comprising: - a support structure (100) comprising at least one attachment portion (127) for attaching the welding head to the multi-axis industrial robot arm; - a first electrode-holder arm (200) carrying a first welding electrode (202) and connected to said support structure; - a second electrode-holder arm (200) carrying a second welding electrode and connected to said support structure (100); and - an electric transformer (400) configured to apply an electrical voltage to said first and second welding electrodes (202, 302). The electric spot-welding head (10) is characterized in that it comprises particular connection devices (700, 800) to facilitate the electrical and hydraulic connection of the electric transformer (400).

Wear electrode for resistance projection welding of bolts (9), with - an electrode body (5) which has an opening (12) for inserting a bolt (9), - a receptacle (24) formed in the electrode body (5), - wherein a sleeve (6) is received in the receptacle (24), characterized in that - that the sleeve (6) has a first section (17) in which the outer diameter of the sleeve (6) tapers towards the opening (12).

Method for two-stage spot welding, comprising: Providing a stack of workpieces (10) containing a first steel workpiece (14, 14A) and a second steel workpiece (14, 14B), wherein the first steel workpiece (14, 14A) and the second steel workpiece (14, 14B) contain a coating (16); Touching the first steel workpiece (14, 14A) with a first concentric electrode (12, 12A) and touching the second steel workpiece (14, 14B) with a second concentric electrode (12, 12B), wherein the first concentric electrode (12, 12A) and the second concentric electrode (12, 12B) each have an outer diameter (OD), an inner diameter (ID) and a tip (24); Removing the coating (16) from the first steel workpiece (14, 14A) to form a first locally exposed section (28, 28A), and from the second steel workpiece (14, 14B) to form a second locally exposed section (28, 28B), by passing an electric current between the first concentric electrode (12, 12A) and the second concentric electrode (12, 12B) and through the workpiece stack (10), wherein the locally exposed sections (28, 28A, 28B) are formed in the shape of a concentric ring with outer diameter (OD) and inner diameter (ID) and are defined by an outer shoulder region (30) and an inner shoulder region (32); and Spot welding of the first steel workpiece (14, 14A) and the second steel workpiece (14, 14B) using a first welding electrode (36A) and a second welding electrode (36B), respectively, wherein the first welding electrode (36A) and the second welding electrode (36B) have a weld end face diameter that is larger than the inner diameter (ID) and smaller than the outer diameter (OD).

The invention relates to a spot welding clamp (1) comprising a lower welding arm (12) carrying a first electrode support (121) and a first electrode (122), and an upper welding arm (11) carrying a second electrode support (111) and a second electrode (112) for performing a spot welding between a first sheet metal part and a second sheet metal part by bringing the first electrode (122) into contact with the first sheet metal part and the second electrode (112) into contact with the second sheet metal part, the second electrode support (111) comprising an internal passage path for a heat transfer fluid intended to evacuate the thermal energy which accumulates in the second electrode (112) during the welding phases,the upper welding arm (11) comprising an internal supply conduit (111A) for heat transfer fluid to the internal fluid passageway of the second electrode support (111) and a discharge conduit (112A) for heat transfer fluid coming from said internal heat transfer fluid passageway, the second electrode support (111) being mounted in an adjustable manner on the upper welding arm (11), and in that it comprises a rigid fluid connection element (13) secured to the upper welding arm (11). [Fig 2],

The resistance welding equipment comprises a base plate and a resistance welding machine, the resistance welding machine is fixed to the top end of the base plate, a lower electrode is installed at the position of a welding workbench seat of the resistance welding machine, an upper electrode is installed at the position of an air cylinder driving block seat of the resistance welding machine above the lower electrode, and the resistance welding equipment further comprises a forking conveying mechanism; the supporting structure is arranged at the position of the base plate of the resistance welding machine and used for being matched with the hollow rotating platform to assemble the material disc with the forking conveying mechanism, and the forking conveying mechanism can clamp the electromagnetic valve coil in a forking mode and convey the electromagnetic valve coil to the position between the lower electrode and the upper electrode in a continuous indexing mode to be pressed and welded. The welded electromagnetic valve coil is conveyed to an electric push rod B and then pushed out to slide to the lower row of the coil guide mechanism to fall out, the vacant forking conveying mechanism rotates to the feeding position to continue feeding, continuous circulation of the electromagnetic valve coil from welding to discharging is achieved, and the resistance welding efficiency of the resistance welding machine on the electromagnetic valve coil in small manufacturers is improved.