265results about "Welding electric supply" patented technology

A blade includes a body having a cutting portion with an edge and a plurality of cutting teeth sequentially aligned along the edge. Each cutting tooth of the plurality of cutting teeth is formed from a corresponding one of a plurality of carbide inserts that is discretely resistance welded to the edge. The body includes at least 15 teeth per inch.

To provide a new improved manufacturing method for a spot-welded joint, the method enabling LME cracking and hydrogen embrittlement cracking to be more surely suppressed.SOLUTION: A manufacturing method for a spot-welded joint is provided in which a plate combination constituted of a plurality of overlapped steel plates is spot-welded, wherein one or more of the plurality of steel plates are high-strength steel plates having a tensile strength of 980 MPa or higher and at least either of the high-strength steel plates and the steel plates arranged adjacently to the high-strength steel plates have galvanized layers. The manufacturing method for a spot-welded joint includes: a main energizing step of forming a nugget; a first cooling step; and a second cooling step in which a cooling speed is faster than in the first cooling step, wherein retention time which is time elapsing after energization is finished until an electrode releases pressurization is 0.5 (sec) or more.SELECTED DRAWING: None

The present invention provides a technique capable of growing nuggets to a desired size in a short time while suppressing the occurrence of sputtering. The resistance spot welding method includes: a pre-energizing step of energizing until an alloy layer diameter, which is the diameter of an alloy layer formed on the outer periphery of a nugget in a welding portion and composed of a constituent material of a plating layer in a metal plate to be welded and a base material of the metal plate, becomes a predetermined target diameter; and a main energization step in which energization is performed after the pre-energization step. The pre-energization step includes a pulse energization in which a high current energization is performed at a current higher than a predetermined threshold current and a low current energization is performed at a current equal to or lower than the threshold current repeatedly at an interval of less than 10 ms. The pulse energization comprises more than two times of high-current energization.

To provide a resistance spot welded joint whose LME split is suppressed, and a manufacturing method for the same.SOLUTION: A resistance spot welded joint includes a plurality of steel plates imposed on one another and a weld zone. One or more of the plurality of steel plates are high strength whose tensile strength is 980 MPa or more. The high-strength steel plate or a steel plate adjacent to the high-strength steel plate is a plated steel plate having a galvanized layer. In the high-strength steel plate, an average interval of a Mn concentration part in the direction orthogonal to a rolling direction is 300 μm or less at a 1 / 20 depth position of a base material and standard deviation of Mn concentration in a retained austenite is 0.40% or less, and Vickers hardness [Hvsur] at a 30 μm depth and Vickers hardness [Hvq] at a 1 / 4 depth position to be a position 1 / 4 plate thickness in the plate thickness direction from the surface of the base material satisfy [Hvsur] / [Hvq]≤0.80.SELECTED DRAWING: None

Provided are a resistance welding system and a method for manufacturing a resistance welded joint, capable of suppressing the occurrence of scattering during resistance welding that is adapted and controlled, and manufacturing a resistance welded joint having an optimal nugget diameter. A resistance welding system according to a first embodiment of the present invention is provided with a pair of electrodes, a power supply device, and a resistance welding control device having a pre-energizing unit and a main welding energizing unit. The main welding energization unit calculates the cumulative amount of heat per unit volume and unit time on the basis of the energization time of the main welding on the basis of the cumulative amount of heat per unit volume, which is obtained in advance and which enables good welding in the plate group. A pre-energizing unit that performs pre-energizing so as to satisfy I1gt by adjusting the inter-electrode resistance, the inter-electrode voltage, or the welding current, which generates the calculated cumulative heat generation per unit volume and unit time; i2, 750 * t < = (I1) 2 * T1 < = 1550 * t, and 10 < = T1 < = 50.

To provide a resistance spot welding method enabling suppression of expulsion and surface flash even when a lot of elements excluding Al and Zn are included in a plating layer.SOLUTION: In a resistance spot welding method, a plate set in which a plurality of steel plates are overlapped are sandwiched with a pair of electrodes, the steel plates are joined through energization while pressurizing the steel plates, at least one of the plurality of steel plates is a surface-treated steel plate having a plating layer having Al or Zn as the main component; the energization is divided into two or more stages of at least initial energization and main energization; an energization stop time is provided in the initial energization and the main energization; and when an initial energization time is t1[ms], and the energization stop time is tc[ms], a relation between t1 and tc is predetermined one among a total plate thickness T[mm], pressurization pressure P[kN], a plated thickness D[μm], and a ratio X of a content (mass%) of elements excluding Al and Zn, included in the plating layer.SELECTED DRAWING: Figure 2

The invention discloses an aluminum alloy plate multi-pulse resistance spot welding connection method which comprises the following steps: S1, selecting two to-be-welded aluminum alloy plates, removing surface dirt by using an alcoholic solution, stacking and fixing the two plates, and preparing for spot welding work; s2, welding parameters are set based on the thickness of the connecting plate of the two plates; and S3, based on the welding parameters in the step S2, prepressing, preheating, welding and tempering processes of the aluminum alloy plate are completed, the method is suitable for the technical field of aluminum alloy resistance welding, the weldable interval of the aluminum alloy plate can be effectively expanded through parameter optimization of the multi-pulse resistance spot welding process, the sensitivity to the welding parameters is reduced, and the welding quality of the aluminum alloy plate is improved. When the precision of welding parameters, electrodes and other equipment fluctuates, the stability of welding spot quality can be improved; meanwhile, the process optimization time can be shortened, the process adjustment time is saved, and the production efficiency is improved; and the weldable interval is large, and welding defects caused by the change of contact resistance on the surface of the aluminum alloy can be reduced.

The purpose of the present invention is to provide a resistance spot welded member and a resistance spot welding method for the same. The present invention pertains to a resistance spot welded member having a resistance spot welded part in which two or more overlapping steel sheets are subjected to resistance spot welding. At least one of the two or more overlapping steel sheets is a Zn plated steel sheet. In a first sheet set that has the largest difference in tensile strength between two steel sheets abutting in the vertical direction, the average thickness of a Fe-Zn alloy layer that has a Fe concentration of 70-95 mass% and a Zn concentration of 5-30 mass% and that is formed in a region located within 300-500 μm from a nugget end in the sheet width direction satisfies formula (1). (1): tFe-Zn≥SiHigh×(Ms1-Ms2)1 / 2×0.5+(θ+8×gSheet) / 5

The invention provides an intelligent welding control method and system under a multi-power hybrid power supply scene. The welding controller is electrically connected with at least two different types of power supplies through the switch unit, and the welding controller is used for driving a welding load; the intelligent welding control method comprises the following steps that in response to the fact that a welding controller is electrically connected with a first power source, information of a connecting part formed by a welding load is obtained; detecting the welding quality based on the information of the connecting part; and in response to the fact that the welding quality does not reach the standard, the switch unit is controlled to act, so that the welding controller is switched from being electrically connected with the first power source to being electrically connected with a second power source. The power supply is adaptively switched based on the welding quality, specifically, under the condition that the first power supply is used for supplying power to the welding controller, if the welding quality of the connecting part does not reach the standard, the second power supply is actively switched to supply power to the welding controller, and the defect rate of the welding quality is prevented from being further increased as much as possible.

To provide a technique that can achieve high-quality welding, in resistance spot welding to a work-piece.SOLUTION: A work-piece having a plurality of metal plates overlapped with each other is welded using a resistance spot welding device. First energization control is performed to a pair of electrodes so that first current flow between the pair of electrodes holding the work-piece. Subsequently, second energization control is performed to the pair of electrodes so that the current flowing between the pair of electrodes reduces from the first current to second current smaller than the first current. Subsequently, third energization control is performed to the pair of electrodes so that the current flowing between the pair of electrodes increases from the second current to third current larger than the second current. Subsequently, fourth energization control is performed to the pair of electrodes so that fourth current flows between the pair of electrodes.SELECTED DRAWING: Figure 3

To provide a resistance spot weld joint and a method for manufacturing an automobile component which can simply avoid joint failures in a plate set where a plate thickness ratio is 4.5 or more and a thinnest steel plate is arranged thereon.SOLUTION: There is provided a method for manufacturing a resistance spot weld joint, wherein a pressurization force P1 of a first pressurization step, a pressurization force Pr of a pressurization release step and a pressurization force P2 of a second pressurization step satisfy P1≤P2, 2<P1 and Pr≤2, a current value I1 of a first energization step and a current value I2 of a second energization step satisfy I1≤I2 and 4≤I1, an energization time T1 of the first energization step satisfies 50×tsum / 2<T1<200×tsum / 2, an energization time T2 of the second energization step satisfies 50×tsum / 2<T2, and when the first pressurization step includes a holding step, a holding time Th1 of the holding step satisfies Th1<300, and a time Tr of the pressurization release step satisfies 20<Tr.SELECTED DRAWING: Figure 1

Provided is a resistance spot welding method that can prevent the occurrence of cracking in the weld according to the angle of electrodes irrespective of the type of steel and can maintain the strength of the joint sufficiently. The resistance spot welding method for joining a sheet set including a plurality of lapped steel sheets includes: holding the sheet set between a pair of electrodes; and energizing the sheet set under application of electrode force to thereby join the steel sheets together. At least one of the plurality of lapped steel sheets is a surface-treated steel sheet including a metal coating layer on a surface thereof. The energizing includes: a primary energizing step of performing energization to form a nugget portion; a non-energizing step in which, after the primary energizing step, the energization is suspended for an energization suspension time Tc (cycles); and a secondary energizing step of, after the non-energizing step, performing energization for reheating while the nugget portion is prevented from growing. During the energizing, the relations of the following formula (I) are satisfied: 22+A⋅B / 100<Ip / Im<Cwhen0<A<3,17+A⋅B / 80<Ip / Im<Cwhen3≤A<7,and11+A⋅B / 60<Ip / Im<Cwhen7≤A<15, where A is an electrode misalignment angle (degrees) of the electrodes, Im is a current value (kA) in the primary energizing step, Ip is a current value (kA) in the secondary energizing step, B is a variable defined as 1 + 0.1·Tc, and C is a variable defined as 1 + 0.2·Tc.

The present invention relates to a welding apparatus comprising: an upper welding unit including an upper welding rod; a first object to be bonded positioned below the upper welding rod; a second object to be bonded positioned below the first object to be bonded; and a lower welding unit including a lower welding rod positioned below the second object to be bonded, wherein the first object to be bonded and the second object to be bonded are welded by resistance welding of the upper welding rod and the lower welding rod, and the welding apparatus comprises a displacement measuring unit capable of measuring the displacement of a buffer unit provided on at least one of the upper end of the upper welding rod or the lower end of the lower welding rod by additional pressure while the upper welding rod, the first object to be bonded, the second object to be bonded, and the lower welding rod are in close contact with each other.

The invention provides a control design for discriminating false rings in chain flash butt welding, so that flash butt welding equipment performs corresponding control processing. On the basis of the Ohm law I = U / R, the false ring is discriminated by means of the difference between current passing through the real ring and current passing through the false ring when the device is ready to enter the flash butt welding technological process, chain operation processing is carried out after the device exits the welding technological process, the device can enter the whole welding technological process until the next real ring appears, and the discriminated false ring can be reused. Burnout and damage of the false ring in the chain welding process can be avoided, and the effects of saving materials, reducing the production cost and prolonging the service life of equipment are achieved; the time-consuming and labor-consuming re-hanging of the chain can be avoided, especially for the production of oversized short chains such as 5, 7, 9 and 11 chains, the labor intensity is greatly reduced, and the production efficiency is greatly improved; and the intelligent and automatic control degrees of the flash butt welding equipment are synchronously improved.

The purpose of the present invention is to provide a resistance spot welding method. The present invention is a resistance spot welding method for two or more steel sheets including at least one surface-treated steel sheet having a metal plating layer, the method comprising a cooling step, a post-energization step, and a holding step after a main energization step for forming a welding spot, the cooling time Ct in the cooling step being 140 ms or more, and the post-energization step being less than the cooling time Ct in the holding step being less than the cooling time Ct in the post-energization step. The holding time Ht (ms) in the holding step satisfies the following formula (1) or formula (2). # imgabs 0 #, # imgabs 1 # imgabs 2 # in # imgabs 3 #, # imgabs 4 # in # imgabs 0 #, # imgabs 2 # in # imgabs 3 #, # imgabs 4 #

The purpose of the present invention is to provide a resistance spot welding method. The present invention is a resistance spot welding method for joining a sheet group in which two or more steel sheets including at least one high-strength steel sheet are overlapped, the method using a steel sheet having a specific component composition as the high-strength steel sheet, the method comprising: a main energization step for forming a resistance spot welded portion by energizing the sheet group at a current value Iw; and a post-heat treatment step which comprises a cooling step in which the resistance spot-welded part is cooled for a cooling time tc exceeding 800 ms after the main energization step, and a temperature rise step in which energization of the resistance spot-welded part is performed for an energization time tt exceeding 100 ms and not more than 300 ms at a current value It of 1.05 * Iw < = It < = 1.80 * Iw during the temperature rise step, the post-heat treatment step having a cooling step in which the resistance spot-welded part is cooled for a cooling time tc exceeding 800 ms and a temperature rise step in which energization of the resistance spot-welded part is performed for an energization time tt exceeding 100 ms and not more than 300 ms.

The purpose of the present invention is to improve the quality of dimples when resistance spot welding is continuously performed on different metals. A resistance spot welding method for joining pieces to be welded by sandwiching the pieces to be welded in which a plurality of metal members are overlapped with each other between a pair of electrodes and energizing the pieces to be welded, the resistance spot welding method comprising: a pre-energizing step for preheating the pieces to be welded by energizing between the pair of electrodes; and a main energization step, which is performed after the pre-energization step, and in which energization is performed between the pair of electrodes, thereby forming nuggets on the material to be welded and joining the material to be welded, the energization time of the main energization step being shorter than the energization time of the pre-energization step, and the energization time of the main energization step being shorter than that of the pre-energization step. The current value of the welding current in the main energization step is greater than the current value of the welding current in the pre-energization step.

A resistance spot welding method includes a pre-energization step of performing energization on metal plates as a welding target until an alloy layer diameter reaches a predetermined target diameter, the alloy layer being formed at an outer periphery of a nugget in a welded part of the metal plates and including a constituent material of a plating layer of the metal plate and a base metal of the metal plate; and a main energization step of performing energization after the pre-energization step. The pre-energization step includes a pulsation energization that repeatedly alternates a high current energization and a low current energization, the high current energization being performed at a current higher than a predetermined threshold current, the low current energization being performed at a current lower than or equal to the threshold current. The pulsation energization includes performing the high current energization two times or more.

The present invention relates to a welding method for the manufacture of an assembly of at least two steel substrates spot welded together through at least one weld joint, comprising: A. provision of said substrates (3, 3'), said first substrate being a press-hardened steel part obtained by press-hardening of a steel sheet coated with an aluminium-based coating; B. application of a spot welding cycle by means of a spot welder comprising a welding electrode (1, T) and a spot welding power source (2) applying a current through said substrates, said cycle (21) comprising: - at least three pulsations (22, 32, 42), each having the same maximum pulsation current (Cp) applied through said substrates, the duration p of each pulsation being identical and set between 20 and 60 ms; The present invention relates to a welding method including an application including the same cooling time c following each pulsation, set to 30 to 50 ms, and a welding parameter Wp value of at least 0.8, Wp being defined as Wp=(t×c) / p, where t is the average thickness of the substrate in mm, c is the cooling time in ms, and p is the pulsation duration in ms.

An object is to provide a resistance spot welding method. The present invention is a resistance spot welding method that is performed on a sheet combination of two or more overlapping steel sheets, which include at least one high strength steel sheet, to join the steel sheets together. The high strength steel sheet is a steel sheet having a specific chemical composition. The method includes a main current application step of applying a current having a current value Iw (kA) through the sheet combination to form a resistance spot weld; and a post-heat treatment step including a cooling process and a heating process, the cooling process following the main current application step and including cooling the resistance spot weld for a cooling time tc of greater than 800 ms, the heating process following the cooling process and including applying a current having a current value It of 1.05 × Iw ≤ It ≤ 1.80 × Iw through the resistance spot weld for a current application time tt of greater than 100 ms and 300 ms or less.

A saw blade comprises a body with a cutting section having a rim and a plurality of cutting teeth sequentially aligned along the rim. Each cutting tooth of the plurality of cutting teeth is formed from a corresponding plurality of carbide inserts discretely resistance-welded to the rim. The body comprises at least 15 teeth per inch.

This spot welding device is a spot welding device for performing spot welding on a plurality of steel sheets overlapping with each other by clamping the plurality of steel sheets between a pair of electrodes, and energizing the plurality of steel sheets while pressurizing the plurality of steel sheets, in which a speed at which the pair of electrodes approach each other is limited to at least 12.0 mm / s or slower during a period from start of the energization to end of the energization.

An apparatus is disclosed. The apparatus has a power supply, a control device connected to the power supply, a welding device selectively connected to the power supply via the control device, and a switch connected between the control device and the welding device. The control device includes a time delay relay that measures a predetermined time period. The switch maintains a closed position when the predetermined time period expires and the welding device is producing a welding arc. The switch switches from the closed position to an open position when the predetermined time period expires and the welding device stops producing the welding arc. The control device transfers current from the power supply to the welding device when the switch is in the closed position, and blocks current from the power supply to the welding device when the switch is in the open position.

To provide resistance spot welding in which a required nugget diameter can be stably obtained even when a disturbance exists. A resistance spot welding method includes performing actual welding and test welding prior to the actual welding. In the test welding, a time variation curve of an instantaneous amount of heat generation per unit volume and a cumulative amount of heat generation per unit volume calculated from an electrical property between electrodes when a target nugget diameter is formed by performing passing of current under constant current control is stored. In the actual welding, the time variation curve of the instantaneous amount of heat generation per unit volume and the cumulative amount of heat generation per unit volume stored in the passing of current in the test welding is set as target values of passing of current in the actual welding, and adaptive control welding in which a current-passing amount is controlled in accordance with the target values is performed. In the actual welding, a constant lower limit set value for a current is provided.

Welding device (1), in particular for joining sheet metal elements (2) for motor vehicles by welding, comprising a welding gun device (3), in particular a servo welding gun, which has a displacement detection device (9) designed to detect displacement information, in particular a displacement traveled, of at least one welding gun element (4, 5) of the welding gun device (3) and a force detection device (10) designed to detect force information relating to a force acting on at least one welding gun element (4, 5) of the welding gun device (3), wherein the welding device (1) is designed to determine a force-displacement relationship based on a first displacement information realized at a first force value and a second displacement information realized at a second force value and to determine a target displacement information for a specific welding force in a welding process based on the force-displacement relationship.

The present invention discloses a power supply device and a resistance welding machine for resistance welding of thermoplastic composite materials, belonging to thermoplastic composite material processing equipment. The power supply device includes a power supply board and a joint assembly; the power supply board includes a negative electrode sheet and a positive electrode sheet, and the negative electrode sheet and the positive electrode sheet are separated by an insulating sheet; the joint assembly includes a plug and a socket; one end of the socket is connected to the plug, and the other end is fixed to the positive electrode sheet of the power supply board; the plug is provided with an output contact for output, and a positive contact and a negative contact are also provided inside the plug; when the plug is inserted into the socket, the positive contact can contact with the output contact, so that the plug is connected to the positive electrode sheet; when the plug is separated from the socket, the negative contact can be connected with the output contact, so that the plug is connected to the negative electrode sheet. The present invention can improve the safety performance of resistance welding of thermoplastic composite materials, reduce the risk of electric shock, and is simple and convenient to operate.

To produce a battery pack in which two cylindrical battery cells arranged linearly are electrically connected in series.SOLUTION: A battery pack 1 has battery cells 10A, 10B linearly arranged in series, each having a conductive and cylindrical exterior tube 13. A battery tab is disposed between a positive electrode terminal of one battery cell and a negative electrode terminal of the other battery cell to electrically connect the two battery cells in series. The battery tab includes a welded plate portion disposed between the two battery cells, and a powered plate portion continuous with the welded plate portion and located outside the battery cells in a radial direction. The welded plate portion has two protrusions fixed to the negative electrode terminal by projection welding on a surface facing the negative electrode terminal of the other battery cell.SELECTED DRAWING: Figure 1

There is a need to optimize the number of attitudes in which a welding gun is positioned in an operation for acquiring a pressure force for correcting a pressure force command of a welding gun, and to simplify that operation.　A device 70 comprises: an operation execution unit 62 that causes a robot 12 to operate so as to position a welding gun 14 at a teaching attitude defined in a welding work program; a pressure force acquisition unit 64 that acquires a pressure force from when the welding gun 14 is positioned at the teaching attitude by the operation execution unit 62 and is driven by a first pressure force command; and a command correction unit 66 that corrects the first pressure force command on the basis of the pressure force acquired by the pressure force acquisition unit 64, thereby calculating a second pressure force command for driving the welding gun 14 at the teaching attitude at the time of execution of the welding work program.