44results about "Welding electric supplies" patented technology

Provided is a spot welding method capable of performing current control that makes a rising slope of waveform constant even in a case where pulse-shaped waveforms overlap with each other. The spot welding method includes, for a welding current L10: setting a target rise current value P for each predetermined PWM pulse when the welding current L10 increases toward a peak current range R1; and setting, as a first target current value A, a target rise current value P that is larger than and the closest to a rise start current value S in a case where an effective value L14 of the welding current reaches a set welding current L23 while the welding current is decreasing toward a bottom current PB.

The invention discloses a multifunctional 20K high-frequency precision welding power supply control system, and belongs to the technical field of welding equipment. The system comprises a control box body and a power supply control system, one end of the control box body is provided with a man-machine interaction panel, the outer wall of the other end of the control box body is provided with a multi-end interface, and the inner wall of the other end of the control box body is embedded with a load fan; the welding frequency free switching technology is adopted, the welding waveform smoothness is greatly improved, more stable welding current is obtained, meanwhile, the current control precision is higher, the response speed is higher, and the method can better adapt to various complex welding conditions; through cooperative work of the voltage supervision center, the carrying state analysis module and the environment supervision module, comprehensive monitoring and management of the operation state of the thermocompression welding machine are achieved, and the operation stability and reliability of the whole welding system are improved.

This method for predicting characteristics of a welded section (5) is a method for predicting characteristics of a welded section (5) obtained by resistance spot welding in which a current flows between two electrodes (3, 4) sandwiched between a plate group in which two or more metal plates are stacked, the method comprising: a step for acquiring electrical information output during resistance spot welding; the electrical information comprises at least one of a current flowing between the two electrodes (3, 4), a voltage between the two electrodes (3, 4), a resistance between the two electrodes (3, 4), or a calorific value between the two electrodes (3, 4) in resistance spot welding; and a step of predicting characteristics of the welded portion (5) on the basis of the electrical information.

A high frequency power supply system provides highly regulated power and frequency to a workpiece load where the highly regulated power and frequency can be independent of the workpiece load characteristics by inverter switching control and an inverter output impedance adjusting and frequency control network that can include precision variable reactors with a geometrically-shaped moveable insert core section and a stationary split-bus section where the insert core section can be moved relative to the stationary split-bus section to vary the inductance of the variable reactors.

Provided is a spot welding method capable of reliably welding a metal sheet laminate while suppressing occurrence of expulsion. In the spot welding method, a pulse current is applied in a first current application step and a second current application step by a DC chopping control method. In the DC chopping control method, a pulse waveform of the pulse current is generated by switching between current application and current application stop to a pair of electrodes 12 and 22 by a current switch 28, a peak current value of the pulse current in the first current application step is set to a value A1 equal to that of the pulse current in the second current application step, and a power of the pulse current in the first current application step is set to a value larger than that of the pulse current in the second current application step.

The problem to be solved by the present invention is to provide a spot welding method capable of performing current control in which the rise slope of a waveform is fixed even when pulse-shaped waveforms overlap. In order to solve the problem, in the spot welding method, when the welding current (L10) rises toward the peak current range (R1), the rising target current value (P) is set for each predetermined PWM pulse, and when the effective value (L14) of the welding current reaches the set welding current (L23) during the falling toward the valley current (PB), the rising target current value (P) is set for each predetermined PWM pulse. A rising target current value (P), which is larger than and closest to the rising start current value (S), is set as a first target current value (A).

Components of an electrical resistance welding system include a DC power supply, an energy storage assembly, a switch, and an electrical resistance welding assembly configured to weld a work piece. The system may be free of any transformer which permits the system to operate in an infinite number of variable voltages between a minimum and maximum system setting. The variable voltage control permits greater operability of the electrical resistance welding system by creating a specific weld voltage dependent on parameter, such as a dimension, of the work piece that is to be welded.

The invention relates to a spot welding method comprising steps of: positioning, between two electrodes (E123, E22), two electrically conductive parts (P1, P2) to be joined together, each of the two parts having an interface zone (S3) between the two parts and a contact zone (S1, S2) for contact with one of the two electrodes, establishing a first electric current between the two electrodes through the two parts, the first electric current producing thermal energy that is able to form a welding core (WN1-WN8) within the two parts, and adjusting a distribution of thermal energy density produced by the first electric current on the basis of intrinsic characteristics of each of the two parts, in order to generate a striking zone of the welding core, at a chosen depth in the parts to be joined together.

The invention provides a multi-mode resistance welding power source, a control method, a terminal and a storage medium. According to the method, a phase-shifted full-bridge circuit, a rectifying circuit, a modal control circuit and an inverter circuit which are connected in sequence are included; the phase-shifted full-bridge circuit is used for converting direct current of the direct-current power supply into alternating current and carrying out voltage reduction; the rectifying circuit is used for converting the alternating current after voltage reduction into direct current after voltage reduction; the modal control circuit is used for outputting the voltage-reduced direct current at a constant voltage in a constant voltage mode and outputting the voltage-reduced direct current at a constant current in a constant current mode; and the inverter circuit is used for converting the voltage-reduced direct current into alternating current pulse and outputting the alternating current pulse. According to the invention, output of high-power harmonic-free oscillation-free constant-voltage / constant-current positive-polarity, negative-polarity and bipolar pulses can be realized.

The present disclosure generally relates to a welding machine adapted for performing a spot welding process on a workpiece, wherein the welding machine is specifically adapted for automatically applying pre-conditioning a welding pulse portion to the workpiece prior to performing the spot welding process. The present disclosure also relates to a corresponding method and computer program product.

The present invention discloses an intelligent preheating flash butt welding method considering the change of the temperature field of the welded joint, including clamping, flashing flat stage, preheating stage, continuous flashing stage, upsetting stage and reset stage. In the flashing flat stage, according to the welding current I t and the threshold current I 门限 relationship and the temperature field of the welded joint, control the time and number of flashes for a single flashing flat to ensure that the flashing flat is completed under the conditions of the shortest time, the least material and energy consumption. In the preheating stage, according to the welding current I t and the threshold current I 门限 relationship and the temperature field of the welded joint, control the single preheating cooling time and the number of preheating times to improve the heating efficiency and quality and shorten the consumption in the preheating stage. In the continuous flashing stage, determine the starting point of continuous flashing according to the distance between the moving and static fixtures when the welding current is greater than the threshold current for the first time in this stage. In the upsetting stage, control the time of non-electric upsetting according to the temperature field of the welded joint, and shorten the upsetting holding time on the premise of ensuring the weld strength, which has the advantage of improving the welding efficiency.

Components of an electrical resistance welding system include a DC power supply, an energy storage assembly, a switch, and an electrical resistance welding assembly configured to weld a work piece. The system may be free of any transformer which permits the system to operate in an infinite number of variable voltages between a minimum and maximum system setting. The variable voltage control permits greater operability of the electrical resistance welding system by creating a specific weld voltage dependent on parameter, such as a dimension, of the work piece that is to be welded.

Welding system for carrying out a welding process, comprising: a welding control; a welding power source; one or more contacts, wherein one or more, in particular all, contacts are engaged with a component to be welded; a distribution system, wherein the distribution system comprises a corresponding supply line for each of the contacts; wherein the distribution system is configured to activate the supply line corresponding to the contact for each welding point and to direct the welding current to the contact via the corresponding supply line and to deactivate it again after the welding point has been placed on the component.

Components of an electrical resistance welding system include a DC power supply, an energy storage assembly, a switch, and an electrical resistance welding assembly configured to weld a work piece. The system may be free of any transformer which permits the system to operate in an infinite number of variable voltages between a minimum and maximum system setting. The variable voltage control permits greater operability of the electrical resistance welding system by creating a specific weld voltage dependent on parameter, such as a dimension, of the work piece that is to be welded.

Components of an electrical resistance welding system include a DC power supply, an energy storage assembly, a switch, and an electrical resistance welding assembly configured to weld a work piece. The system may be free of any transformer which permits the system to operate in an infinite number of variable voltages between a minimum and maximum system setting. The variable voltage control permits greater operability of the electrical resistance welding system by creating a specific weld voltage dependent on parameter, such as a dimension, of the work piece that is to be welded.

An object is to provide a method for producing a resistance spot welded joint. The present invention involves a preparatory step of overlapping two or more steel sheets including at least one high-strength steel sheet to form a sheet assembly; a welding step of resistance spot welding the sheet assembly; and a heat treatment step of heat-treating a resistance spot weld. The welding step includes a main heating step of forming the resistance spot weld; and a post-heating step including a cooling process of cooling the resistance spot weld for a cooling time tc1 of 20 to 800 ms, a heating process of subsequently applying a predetermined current I2 to the resistance spot weld for a current passing time t2 of 10 to 200 ms, and a holding process of subsequently applying a predetermined current I3 to the resistance spot weld for a current passing time t3 of more than 0 ms and less than 600 ms. The heat treatment step includes heat-treating the resistance spot weld at a temperature T of 70 to 300°C for a time t4 of 5 to 30 min.

A resistance spot welded joint is formed by resistance-spot-welding a plurality of steel sheets including at least one high strength steel sheet. The high strength steel sheet has a specific chemical composition, and the microstructure of a nugget edge region includes ferrite at an area fraction of 1% or more with respect to the total area of the nugget edge region. The hardness Hv of a softest portion of the nugget edge region and the hardness Hvm of a central portion of the nugget satisfy the relation 0.90×Hvm>Hv, and the hardness Hvh of a HAZ softened region and the hardness Hvm of the central portion of the nugget satisfy the relation 0.90×Hvm>Hvh.

To provide a welding power supply device which can be adjusted to desired welding conditions.SOLUTION: In the welding power supply device, the power storage unit stores power when any one of the three switching elements is in a conductive state, and outputs a current from at least one switching element to a welding electrode in contact with an object to be welded when any one of the three switching elements is in a non-conductive state. A first signal generator generates, based on a reference clock, three pulses in which a phase of a switching control cycle in each phase is shifted by 120 degrees, and generates three first signals for pulse modulation corresponding to each phase from the generated three pulses. A second signal generation unit generates three second signals for adjusting a conduction time, which is a period of a conduction state of each switching element, based on the three first signals. The drive unit outputs a third signal for applying a predetermined voltage to each switching element to each switching element based on the three second signals, and brings each switching element into a conductive state or a non-conductive state.SELECTED DRAWING: Figure 2

The invention relates to a spot welding method, comprising steps consisting in: arranging two electrically conductive parts (P1, P2) to be joined between two electrodes (E123, E22), each of the two parts having an interface zone (S3) between the two parts and a contact zone (S1, S2) with one of the two electrodes, establishing a first electric current between the two electrodes through the two parts, the first electric current producing thermal energy capable of forming a welding nugget (WN1-WN8) within the two parts, and adjusting a distribution of thermal energy density produced by the first electric current according to intrinsic characteristics of each of the two parts, to generate a welding nugget initiation zone, at a chosen depth in the parts to be joined. Figure 3

A welding system (2) and a method for transferring specific data for producing a welded joint (7) between welding controls (11 to; 21 to 24; 31, 32) of the welding system (2) are provided. The welding system (2) has at least two welding controllers (11 to 13; 21 to 24; 31, 32) each configured to store welding joint data (1311 to 1317) for producing the weld joint (7), at least one welding tool (41) for producing a weld joint (7) on at least one workpiece (5; 5, 6) under control of one of the at least two welding controllers (11 to 13; 21 to 24; 31, 32) on the basis of the stored welding joint data (1311 to 1317), and a communication device (15; 25) for communicating with the at least two welding controllers (11 to 13; 21 to 24; 31, 32), wherein the communication device (15;25) is designed to initiate a transmission of welding joint data (1311 to 1317) stored on the communication device (15; 25) from a source welding control (11) of the at least two welding controls (11 to 13; 21 to 24; 31, 32) to a target welding control (12, 13; 21 to 24; 31, 32) of the at least two welding controls (11 to 13; 21 to 24; 31, 32).

The invention provides a welding power supply device capable of adjusting a desired welding condition. A power storage unit of the welding power supply device stores power when any one of the three switching elements is in an on state, and outputs current from at least one switching element to a welding electrode in contact with an object to be welded when the power storage unit is in a non-on state. The first signal generation unit generates, on the basis of a reference clock, three pulses in which the phases of the switching control cycle in each phase are shifted by 120 degrees, and generates, from the generated three pulses, three first signals for pulse modulation corresponding to each phase. The second signal generation unit generates, on the basis of the three first signals, three second signals for adjusting the ON time, which is the period of the ON state of each switching element. The drive unit outputs a third signal for applying a predetermined voltage to each switching element to each switching element on the basis of the three second signals, and brings each switching element into a conductive state or a non-conductive state.

The application discloses a kind of multifunctional 20K high-frequency precision welding power supply control systems, belong to welding equipment technical field;The application includes control box and power control system, the one end of control box is provided with man-machine interaction panel, the outer wall on the other end of control box is provided with multiple interfaces, load fan is embedded on the inner wall of the other end of control box;The application adopts welding frequency free switching technology, greatly improves the smoothness of welding waveform, obtains more stable welding current, while current control precision is higher, response speed is faster, can be more suitable for a variety of complex welding conditions;Through the collaborative work of voltage supervision center, carrying state analysis module and environmental supervision module, the overall monitoring and management of hot press welding machine operating state are realized, and the operating stability and reliability of the entire welding system are improved.

The invention discloses a lifting lug energy-saving welding mechanism of a flower basket barrel tank, which belongs to the technical field of welding and comprises a direct current bus, a bidirectional converter connected onto the direct current bus, a flywheel energy storage device connected onto the bidirectional converter and a mains supply power grid connected onto the direct current bus, and the mains supply power grid is used for charging the flywheel energy storage device. The direct-current bus is connected with a direct-current welding machine, the direct-current welding machine is connected with a welding executing mechanism, the flywheel energy storage device supplies power to the direct-current welding machine after sequentially passing through the bidirectional converter and the direct-current bus so as to provide stable current for the direct-current welding machine, and the bidirectional converter is connected with a controller. The controller controls the flywheel energy storage device to release energy by controlling the bidirectional converter. Power grid fluctuation is stabilized through the energy storage device, continuous and stable instantaneous large current is provided, PI closed-loop control is matched, it is ensured that energy input of each welding spot is consistent, the problem that the strength of the welding spots is not uniform is thoroughly solved, high-voltage standby is not needed in the interval period, no-load power consumption is greatly reduced, and green energy saving is achieved.

Various embodiments of the present disclosure provide a generator. The generator includes an LLC resonant circuit configured to generate a sinusoidal input signal by filtering out harmonic components of a pulse-width modulated (PWM) input signal. The generator also includes a transformer having a primary coil and a secondary coil. The transformer is configured to receive, at the primary coil, the sinusoidal input signal from the LLC resonant circuit to generate a magnetic field, and induce a sinusoidal output signal at the secondary coil based on electromagnetic induction associated with the magnetic field. The generator also includes a transducer configured to convert the sinusoidal output signal into mechanical vibrations that drive an output device.

To provide a welding power supply device which can be adjusted to desired welding conditions.SOLUTION: In the welding power supply device, the power storage unit stores power when any one of the three switching elements is in a conductive state, and outputs a current from at least one switching element to a welding electrode in contact with an object to be welded when any one of the three switching elements is in a non-conductive state. A first signal generator generates, based on a reference clock, three pulses in which a phase of a switching control cycle in each phase is shifted by 120 degrees, and generates three first signals for pulse modulation corresponding to each phase from the generated three pulses. A second signal generation unit generates three second signals for adjusting a conduction time, which is a period of a conduction state of each switching element, based on the three first signals. The drive unit outputs a third signal for applying a predetermined voltage to each switching element to each switching element based on the three second signals, and brings each switching element into a conductive state or a non-conductive state.SELECTED DRAWING: Figure 2

Components of an electrical resistance welding system include a DC power supply, an energy storage assembly, a switch, and an electrical resistance welding assembly configured to weld a work piece. The system may be free of any transformer which permits the system to operate in an infinite number of variable voltages between a minimum and maximum system setting. The variable voltage control permits greater operability of the electrical resistance welding system by creating a specific weld voltage dependent on parameter, such as a dimension, of the work piece that is to be welded.

A welded member and a method for producing the welded member are disclosed. The welded member is prepared by resistance-spot-welding a sheet set including two or more overlapping steel sheets. The total thickness tall of the sheet set and the minimum thickness tweld of the resistance spot weld satisfy formula (1), and at least one of the two or more steel sheets is a steel sheet having a softened layer in a steel sheet surface layer. In a base metal zone in the steel sheet having the softened layer, the nanoindentation hardness Hbs of the steel sheet surface layer and the nanoindentation hardness Hbt inside the steel sheet satisfy formula (2).0.5<tweld / tall<1.(1)0.2<Hbs / Hbt<0.8(2)

A welded portion characteristic prediction method is a method of predicting characteristics of a welded portion (5) obtained by resistance spot welding to pass a current between two electrodes (3, 4) clamping a sheet combination of three or more overlapping metal sheets, the method including acquiring electrical information outputted during resistance spot welding, inputting the electrical information to a first prediction model (221) for predicting characteristics of a first welded portion (51) and acquiring a prediction result of the characteristics of the first welded portion (51) outputted from the first prediction model (221), and inputting the electrical information to a second prediction model (222) for predicting characteristics of a second welded portion (52) and acquiring a prediction result of the characteristics of the second welded portion (52) outputted from the second prediction model (222).

It is an object to provide a welded member and a method for producing the welded member. The invention relates to a welded member prepared by resistance-spot-welding a sheet set including two or more overlapping steel sheets. The total thickness tall of the sheet set and the minimum thickness tweld of the resistance spot weld satisfy formula (1), and at least one of the two or more steel sheets is a steel sheet having a softened layer in a steel sheet surface layer. In a base metal zone in the steel sheet having the softened layer, the nanoindentation hardness Hbs of the steel sheet surface layer and the nanoindentation hardness Hbt inside the steel sheet satisfy formula (2). 0.5<tweld / tall<1.0 0.2<Hbs / Hbt<0.8

The present disclosure concerns a spot welding method, including the following steps of: arranging two electrically conductive parts to be assembled between two electrodes, each of the two parts having an interface zone between the two parts and a contact zone with one of the two electrodes; establishing a first electric current between the two electrodes through the two parts, the first electric current producing thermal energy capable of forming a weld nugget within the two parts; and adjusting a distribution of the thermal energy density produced by the first electric current based on the intrinsic characteristics of each of the two parts, to generate a weld nugget initiation zone at a selected depth in the parts to be assembled.