211results 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 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 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 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 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 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.

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.

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.

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.

The invention relates to the technical field of machine tool welding, in particular to a machine tool welding method and system for metal material welding, and the method comprises the following steps: injecting detection current which does not cause metal melting into a welding loop in a pre-pressing stage of pressing a to-be-welded metal part by an electrode of a welding machine tool; measuring the initial contact resistance of the welding loop; establishing and tracking an electrode state reference according to the initial contact resistance; after main welding current is applied to a welding machine tool, disturbance caused by electrode state changes in a main welding signal is recognized and decoupled through the electrode state reference; according to the recognition and decoupling result, differential adjustment is conducted on welding parameters of the welding machine tool; by introducing an electrode state reference and signal identification decoupling mechanism, deeper understanding and more accurate control on the welding process are realized, and the limitation that material differences and electrode state changes are difficult to effectively deal with in a complex production environment in the prior art is overcome.

The invention discloses a welding power source channel copying system and method.The copying system comprises a cloud management system and a plurality of welding power sources which are connected through a communication network, and the welding power sources are in communication connection with the cloud management system through an IOT module and used for achieving transmission of channel data between the welding power sources and the cloud management system; the plurality of welding power supplies comprise a master machine and at least one slave machine, the master machine uploads channel data to the cloud management system through an IOT module of the master machine, and the cloud management system transmits the channel data to the slave machine; wherein the channel data comprises welding parameters of the welding power source. The invention aims at providing a welding power source channel copying system and method to solve the problems that in the prior art, a channel copying method is tedious in operation, low in efficiency and difficult to adapt to large-scale multi-device deployment.

A resistance spot welding method includes the steps of: removing at least part of oil on a surface of a welding target material by energization between a pair of electrodes; and after the oil removal step, forming a nugget in an overlapped portion of the welding target material by energization between the pair of electrodes.

One embodiment of the present application relates to a resistance spot welded joint, which is a resistance spot welded joint provided with a plurality of steel sheets overlapping each other and a welded portion having a nugget joining the steel sheets and a plastic metal zone and a heat-affected zone formed around the nugget, one or more of the plurality of steel sheets being a high-strength steel sheet having a tensile strength of 780 MPa or more, one or more of the plurality of steel sheets being a plated steel sheet having a zinc-based plated layer, the high-strength steel sheet and the plated steel sheet abutting each other at an overlapping surface, the heat-affected zone having a diameter of 1.5 times or more the diameter of the nugget, and 40 / 100 μm 2 The equivalent circle diameter of the carbide described above is 0.1 μm or more, the amount of η phase of the zinc-based plated layer in the plastic metal zone is 20 area% or less.

The invention relates to the technical field of spot welding, and discloses an indirect dotting method which comprises the steps that a current-conducting plate is movably arranged on a welding positioning clamp and can slide up and down; a to-be-welded part is clamped between the upper conductive plate and the lower conductive plate; an electrode tip of a welding gun is connected with the current-conducting plate; and starting the welding gun, electrifying the current-conducting plate, and carrying out spot welding on the to-be-welded part. During indirect dotting operation, the welding positioning clamp is adopted, the to-be-welded part is clamped between the upper conductive plate and the lower conductive plate, the to-be-welded part is fixed, the conductive plates are accurately positioned, and it can be ensured that the conductive plates are tightly attached to the to-be-welded part; the current-conducting plate is elastically connected to the welding positioning clamp and can slide up and down, the current-conducting plate returns to the same position each time under the action of resilience force of the elastic piece and is tightly attached to the to-be-welded piece, the position deviation before and after welding is reduced, and the welding precision is guaranteed; meanwhile, compared with a direct welding method, the loss of the electrode tip is reduced, and the use cost is reduced.

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.

Provided are a projection welded joint with improved peeling strength and delayed fracture resistance, and a method for producing the same. The projection welded joint of this disclosure has a steel sheet and a nut, in which the steel sheet has a predetermined chemical composition, and the minimum hardness Hvc (HV) of region c and the base metal hardness Hvm (HV) of the steel sheet satisfy Hvc / Hvm ≤ 0.85. Region c includes a center axis of the nut of the projection welded joint and is defined below based on a cross-section passing through a center of a joint: with an end point on an inner peripheral side of the nut in contact with the steel sheet being defined as point A, an end point on an outer peripheral side of the nut in contact with the steel sheet being defined as point B, a sheet thickness of the steel sheet at the cross section being defined as t (mm), a point located inside the steel sheet at a depth of 0.20 mm in the sheet thickness direction from point A being defined as point A1, a point located inside the steel sheet at a depth of 2 / 3t in the sheet thickness direction from point A being defined as point A2, a point located inside the steel sheet at a depth of 0.20 mm in the sheet thickness direction from point B being defined as point B1, and a point located inside the steel sheet at a depth of 2 / 3t in the sheet thickness direction from point B being defined as point B2, an internal region of a rectangle formed by connecting points A1, B1, B2, and A2 is defined as region c.

The present application relates to the technical field of butt welding machine, especially to a non-light direct current butt welding machine, comprising: a welding mechanism, comprising a first butt welding assembly, a second butt welding assembly and a direct current transformer; a linkage mechanism, comprising a left moving plate, a right moving plate, a left eccentric shaft and a right eccentric shaft; a driving mechanism, comprising a plurality of servo motors and a top forging oil cylinder; a detection mechanism; a control mechanism, used to weld workpieces by controlling the current value of direct current during welding, used to press workpieces by controlling the rotation angle of the eccentric shaft, used to top forge workpieces by controlling the relative movement of the left moving plate approaching the right moving plate driven by the top forging oil cylinder, used to adjust the height of the left moving plate and the right moving plate respectively by controlling the servo motor to drive the linkage mechanism, and used to adjust the holding time of the top forging pressure according to the total energy of the welded workpiece, and used to correct the top forging displacement target value according to the change rate of the top forging pressure. The present application realizes the improvement of welding efficiency and welding precision.

To provide a spot welding method that can form a weld joint with high joint strength, from high-strength steel plate of 1180 MPa grade or higher.SOLUTION: The spot welding method includes: a step of pinching two overlapped steel plates in a plate thickness direction with a pair of electrodes; a first current-carrying step of carrying current values Ia(kA) between the pair of electrodes; a first non-current-carrying step of stopping the current-carrying for more than 300 ms after the first current-carrying step; a second current-carrying step of carrying currents values Ib(kA) between the pair of electrodes for a current-carrying time of 100 ms or more and 1000 ms or less, after the first non-current-carrying step; a second non-current-carrying step of stopping the current-carrying for 200 ms or more, after the second current-carrying step; and a third current-carrying step of carrying current values Ic(kA) between the pair of electrodes, during time of 100 ms or more and 1000 ms or less, after the second non-current-carrying step, where the current values Ia, Ib and Ic satisfy the following formulas (1) and (2): 0.70<Ib / Ia<0.99 (1) and 0.65<Ic / Ia<0.80 (2).SELECTED DRAWING: Figure 2

A welding transformer (30; 30A; 30B), a welding device (2; 2A; 2B), and a welding method for welding, in particular resistance welding, at least one component (5, 6) are provided. The welding transformer (30; 30A; 30B) comprises a primary winding (31) for connection to a power supply (27), a first secondary winding (32) inductively coupled to the primary winding (31) for connection to a first welding electrode (11) of a welding tool (10), a second secondary winding (34), and a third secondary winding (34), each inductively coupled to the primary winding (31) and connected to the first secondary winding (32) and provided for connection to a second welding electrode (12) of the welding tool (10), wherein, for welding, the at least one component (5, 6) is to be contacted with the welding electrodes (11, 12).a first rectifying branch (41) for rectifying an electric current (I2) flowing between the first secondary winding (32) and the first welding electrode (11), a second rectifying branch (42) for rectifying an electric current (I2) flowing between the second secondary winding (33) and the second welding electrode (12), and a current-limiting element (36, 37) connected to the third secondary winding (34) to limit an electric current through the third secondary winding (34) to a predetermined maximum value.

To improve a quality of a dent, in continuously performing resistance spot welding to different metals.SOLUTION: A resistance spot welding method, which welds a material to be welded made of a plurality of metal members superposed with each other, by energizing the member while sandwiching the member between a pair of electrodes, comprises a pre-electrifying step of applying electric currents between the pair of electrodes to preheat the material to be welded, and a main electrifying step of applying electric currents between the pair of electrodes to form a nugget on the material to be welded to weld the material, after the pre-electrifying step. An electrification time in the main electrifying step is shorter than an electrifying time in the pre-electrifying step, and a current value of welding currents in the main electrifying step is larger than a current value of welding currents in the pre-electrifying step.SELECTED DRAWING: Figure 3

The embodiment of the utility model discloses a spot welding machine and a control circuit thereof. The control circuit comprises a micro-control unit, a direct-current power supply, a charging module, a capacitor module, a boosting module, a power MOS (Metal Oxide Semiconductor) tube module, an MOS tube driving module, a key module, a voltage detection module, a voltage reduction and stabilization module and a spot welding trigger detection module, the micro-control unit is connected with the charging module, the voltage detection module, the step-down and voltage-stabilizing module, the key module and the spot welding trigger detection module, the voltage detection module is connected with the capacitor module, and the direct-current power supply is connected with the charging module, the step-up module and the step-down and voltage-stabilizing module; the boost module is connected with the MOS tube driving module, the MOS tube driving module is connected with the power MOS tube module, the power MOS tube module is connected with the negative electrode of a spot welding pen of the spot welding machine, the capacitor module is respectively connected with the power MOS tube module and the positive electrode of the spot welding pen of the spot welding machine, and therefore the power supply circuit can meet the requirement for operation when no mains supply exists or power is cut off.