68results about "Welding electric supplies" patented technology

A flash welding machine welds together a first metal product's tail with a second metal product's head. The machine includes a carriage, a first structure with a first grip, a second structure slidingly supported by the carriage with a second grip. The power group includes an inverter, a transformer, a rectifier, a control unit operating the inverter at frequencies greater than 700 Hz, and conductors connected to the first and second grips. The transformer delivers predetermined nominal power at a predetermined nominal supply frequency. The predetermined nominal power is less than the predetermined operating power and the nominal supply frequency is less than 700 Hz. At frequencies greater than 700 HZ, actual power equal to / greater than predetermined operating power, or the predetermined nominal power of the transformer is at least equal to predetermined operating power and nominal supply frequency is greater than 700 Hz, with actual power greater than predetermined operating power.

The invention provides a method and a system for regulating and controlling welding current of an inverter resistance welding machine in real time. The method comprises the following steps: welding and acquiring a primary side current signal of a transformer; carrying out segment processing on the current signal of the current cyclic wave; processing and calculating a fast rising section; judging a starting point of a slope section; calculating the target peak current of the slope section; calculating a current cyclic current statistical value; and adjusting the target peak current of the next cycle. Primary side current signals of the inverter type welding machine are collected in real time, segmentation processing and characteristic quantity extraction are conducted on the current signals, the starting point of the slope section is judged, and the target peak current of the slope section is calculated according to a current target value; when the current of the slope section reaches the target peak current, the welding current is cut off; calculating a current statistical value in the current cycle, comparing the current statistical value with a current target value, and adjusting the target peak current of the next cycle; and the steps are repeated until the welding power-on time reaches the preset value, and therefore real-time fine control over the welding current is achieved.

A spot welding gun and a system and method for autonomously calibrating welding quality using the same, the system including: a spot welding gun configured to secure a welding target during a welding process, accurately measure a welding indentation depth, and perform autonomous welding quality calibration in response to an applied control signal; the welding robot is provided with a spot welding gun and is configured to move to a specified welding spot position; the welding controller is configured to control the welding current and the welding time of the point welding gun, and the welding quality is checked in real time by monitoring the welding indentation depth and the dynamic resistance in the welding process; and a welding quality manager configured to receive the welding quality inspection result from the welding controller, send a welding condition feedback change, and control autonomous welding quality calibration.

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.

A solid state welding apparatus comprises a pair of compression bars, a pair of electrodes disposed around the pair of compression bars, respectively, and a controller. The controller controls the pair of compression bars to cause a first load to act on each of the first and second workpieces, subsequently controls the pair of compression bars to subject compressive force to load removal to cause a second load smaller than the first load to act on the first and second workpieces, and subsequently passes a current through the pair of electrodes to remove an impurity on a metal surface.

It is an object to provide a resistance spot welded joint and a resistance spot welding method therefor. The present invention is a resistance spot welded joint having a resistance spot weld formed by resistance-spot-welding two or more steel sheets including at least one high strength steel sheet. The high strength steel sheet has a specific chemical composition. The hardness Hv1 of a first region of a heat-affected zone and the hardness Hmv of martensite in a nugget as a whole satisfy the relation Hv1 ≤ 0.78 × Hmw, and the hardness Hv2 of a second region of the heat-affected zone and the hardness Hv1 of the first region satisfy the relation Hv2 ≥ 1.10 × Hv1. The hardness Hv3 of a third region of the heat-affected zone and the hardness Hv2 of the second region satisfy the relation Hv3 ≤ 0.90 × Hv2.

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 purpose of the present invention is to provide a welded member and a method for manufacturing the same. The present invention is a welded member obtained by resistance spot welding a plate group in which two or more steel plates are stacked, the total plate thickness (tall) of the plate group and the minimum thickness (tweld) of the resistance spot welded portion satisfying formula (1), at least one of the two or more steel plates is a steel plate having a softened layer on the surface layer of the steel plate, and in the base material portion on the steel plate side having the softened layer, the thickness (tall) of the steel plate is less than 1. The nanoindentation hardness Hbs in the surface layer of the steel sheet and the nanoindentation hardness Hbt in the interior of the steel sheet satisfy formula (2). (1) 0.5 < tweld / tall < 1.0 (1); (2) 0.2 < Hbs / Hbt < 0.8 (2).

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.

A resistance spot welded joint having a resistance spot weld formed by resistance-spot-welding two or more steel sheets includes at least one high strength steel sheet. The high strength steel sheet has a specific chemical composition. The hardness Hv1 of a first region of a heat-affected zone and the hardness Hmv of martensite in a nugget as a whole satisfy the relation Hv1≤0.78×Hmw, and the hardness Hv2 of a second region of the heat-affected zone and the hardness Hv1 of the first region satisfy the relation Hv2≥1.10×Hv1. The hardness Hv3 of a third region of the heat-affected zone and the hardness Hv2 of the second region satisfy the relation Hv3≤0.90×Hv2.

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.

To provide a welding machine of a flash welding type, intended to weld together a tail of a first longitudinal metal product with a head of a second longitudinal metal product along an advancement direction.SOLUTION: A machine comprises: a carriage adapted to slide along an advancement direction (X); a first structure (20) with first gripping means (21, 22); a second structure (30), which is slidably supported by said carriage with second gripping means (31, 32); and a power group (40) which can be supplied with mains voltage and is provided with conductors (210), connected to the first gripping means (21, 22) and the second gripping means (31, 32), respectively. The power group (40) comprises: at least one inverter; at least one transformer; at least one rectifier; and a control unit.SELECTED DRAWING: Figure 1

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).