25results about "Pressure electrodes" patented technology

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.

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 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]

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.

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.

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 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).

Wiring is disclosed herein that is configured to supply IRE ablation signals through a catheter body and is resistant against dielectric breakdown, arcing, and noise during ablation. The wiring includes a highly conductive core, a conductive cover surrounding the core that has lower electrical and / or thermal conductivity than the core, and an insulative jacket surrounding the conductive cover. A catheter including such wiring may be suitable for supplying electrical signals to tissue to perform IRE ablation. In some examples, such a catheter can also be suitable for reversible electroporation and / or RF ablation.

A plurality of aluminum materials overlapped with each other are sandwiched between electrodes for spot welding. After main energization to form a nugget between the aluminum materials sandwiched between the electrodes, pulsation energization in which energization and stop of the energization are repeated a plurality of times is performed. A current value in the pulsation energization is set to be greater than a current value of the main energization, the energization and stop of the energization are repeated at least three times in the pulsation energization, and an energization stop period is increased from a first half of the pulsation energization to a second half of the pulsation energization.

A collet assembly including an actuator and a collet connected to the actuator. The collet assembly is adapted to be installed on a welding electrode holder having an electrode. The collet is moveable by the actuator from an advanced position, in which the collet is adapted to grip a fastener such as a welding rivet, and a retracted position, in which at least a portion of the collet is retracted into the actuator to enable the electrode to engage the fastener for welding to a work piece, and the collet is adapted to release the fastener.

An electrode (10) for solid-phase resistance spot joining includes a cylindrical portion (11) that extends in an axial direction, the cylindrical portion (11) being provided with one end (12) in the axial direction. The one end (12) includes a tip end surface (14) to be pressed against a workpiece (301, 302). By providing a plurality of slits (50) by cutting in the axial direction, the one end (12) is divided into a plurality of pieces aligned at an interval in a circumferential direction of the cylindrical portion (11) when viewed from a side of the tip end surface (14).

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 (100); - a second electrode-holder arm (300) carrying a second welding electrode (302) 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. The welding head is characterized in that it comprises specific interface modules (601, 602, 605) to facilitate the electrical and hydraulic connection of the head to the robot arm.