CN110253129B - System and method for aluminum spot welding based on high-frequency inversion direct-current resistance welding power supply - Google Patents
System and method for aluminum spot welding based on high-frequency inversion direct-current resistance welding power supply Download PDFInfo
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- CN110253129B CN110253129B CN201910650233.9A CN201910650233A CN110253129B CN 110253129 B CN110253129 B CN 110253129B CN 201910650233 A CN201910650233 A CN 201910650233A CN 110253129 B CN110253129 B CN 110253129B
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- 238000003466 welding Methods 0.000 title claims abstract description 135
- 238000000034 method Methods 0.000 title claims abstract description 26
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 22
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 238000012544 monitoring process Methods 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 5
- 238000011217 control strategy Methods 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 229910000859 α-Fe Inorganic materials 0.000 claims description 4
- QZLJNVMRJXHARQ-UHFFFAOYSA-N [Zr].[Cr].[Cu] Chemical compound [Zr].[Cr].[Cu] QZLJNVMRJXHARQ-UHFFFAOYSA-N 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 claims description 3
- 230000003044 adaptive effect Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 6
- 229910000838 Al alloy Inorganic materials 0.000 description 11
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003562 lightweight material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/10—Spot welding; Stitch welding
- B23K11/11—Spot welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/24—Electric supply or control circuits therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/24—Electric supply or control circuits therefor
- B23K11/25—Monitoring devices
- B23K11/252—Monitoring devices using digital means
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Resistance Welding (AREA)
Abstract
A system and a method for aluminum spot welding based on a high-frequency inversion direct current resistance welding power supply are characterized in that: the device comprises a resistance welding power supply, a high-frequency transformer, a high-frequency secondary rectifying unit, an electrode unit, a pressure monitoring unit, a voltage feedback unit and a current feedback unit; the pressure monitoring unit is connected with the main control board, so as to realize detection feedback of pressure and control the welding tongs servo motor to pressurize the workpiece according to set pressure; the main control board is connected with the pressure monitoring unit, the voltage feedback unit and the current feedback unit to collect welding pressure, secondary voltage and secondary current. The inversion frequency is 10KHz, 20000 groups of data points can be acquired every second according to the acquired secondary current output waveform, the acquisition rate of the system is improved, and the welding process can be controlled more accurately.
Description
Technical Field
The invention relates to the field of resistance welding, in particular to a system and a method for aluminum spot welding based on a high-frequency inversion direct-current resistance welding power supply.
Background
With the increasing demands of people on environmental protection, energy conservation and emission reduction in the current society, automobile weight reduction is the most effective and direct method for realizing oil consumption and gas emission reduction, and has become the trend of world automobile manufacturing. Aluminum alloys, with their outstanding properties and advantages, are popular among light weight materials, and are favored by many manufacturers and applied to some vehicle models. Resistance spot welding is one of the automobile body connection processes, and is widely applied due to the characteristics of reliable quality, high efficiency, economy, easy automatic welding by using robots and the like. However, because the aluminum alloy has the physical and chemical characteristics of high conductivity, high thermal conductivity, low melting point, easy oxidation and the like, compared with the traditional steel resistance spot welding, the aluminum alloy resistance spot welding is greatly different, mainly shows that short welding time, large welding current, high welding pressure and the like are required, and although related researches are carried out from different directions at home and abroad, most of the aluminum alloy still stays in a laboratory stage, the technical effect of the aluminum spot welding in a practical stage is not ideal, the main problems are that the volume of a transformer is large, the welding tongs have higher requirements on the load structure design of the welding tongs due to the fact that the welding tongs bear great pressure, the power of a controller or a welding power supply is high, the cost is high, the electrode repairing frequency is high, and a special electrode belt or electrode structure is required.
Disclosure of Invention
Aiming at the problems, the invention provides the method and the system for carrying out aluminum spot welding based on the high-frequency inversion direct-current resistance welding power supply, wherein the inversion frequency is 10KHz, 20000 groups of data points can be acquired per second according to the acquired secondary current output waveform, the acquisition rate of the system is improved, and the welding current can be controlled more accurately.
The technical scheme adopted by the invention for solving the technical problems is as follows: a system for aluminum spot welding based on high-frequency inversion direct current resistance welding power supply is characterized in that: the device comprises a resistance welding power supply, a high-frequency transformer, a high-frequency secondary rectifying unit, an electrode unit, a pressure monitoring unit, a voltage feedback unit and a current feedback unit; the pressure monitoring unit is connected with the main control board, so as to realize detection feedback of pressure and control the welding tongs servo motor to pressurize the workpiece according to set pressure; the main control board is connected with the pressure monitoring unit, the voltage feedback unit and the current feedback unit to collect welding pressure, secondary voltage and secondary current.
Further, the resistance welding power supply comprises a main control board, a driving board and a power unit.
Further, the power unit comprises a primary rectifying module, a filter capacitor and an IGBT.
Further, the MCU model on the main control board is STM32F103, and accurate control of secondary signal acquisition time is achieved.
Furthermore, the upper electrode and the lower electrode of the electrode unit are made of chromium-zirconium-copper materials, the diameter d1 of the electrode is 12-18mm, and the end face of the electrode is an arc with the radius R1 being more than 40 mm.
Further, the IGBT and the high-frequency secondary rectification unit of the power unit 10 are a high-frequency IGBT module and a high-frequency rectification module that are adapted to the high-frequency inversion frequency.
Further, the resistance welding power supply is a high-frequency inversion resistance welding power supply, the driving plate is a high-frequency IGBT driving plate, and the main control board is connected with the driving plate to control the driving plate to carry out high-frequency switching control on the IGBT, wherein the inversion frequency reaches 10KHz.
Further, the high-frequency transformer adopts a middle tap form, and the iron core adopts ferrite materials; the current feedback unit adopts an annular rogowski coil and is sleeved at the output end of the high-frequency secondary rectifying unit.
A method for carrying out aluminum spot welding on a direct-current resistance welding power supply based on high-frequency inversion is characterized in that: comprises the following steps
(1) According to the secondary current fluctuation curve, in one welding period, the welding current passes through the effective value of the welding current for 2 times, and a signal at the moment that the current passes through the effective value is connected into an interrupt pin of the main control board;
(2) Sampling output signals of the pressure monitoring unit, the voltage feedback unit and the current feedback unit at the terminal moment when the effective value is exceeded;
(3) Calculating a secondary resistance according to ohm law by the acquired secondary voltage and secondary current, and adjusting an output current resistance weight value Ɛ 1 according to a difference value of the secondary resistance compared with a set resistance curve;
(4) Adjusting an output current pressure weight value Ɛ according to the difference between the acquired secondary pressure data and the set pressure;
(5) The current adjustment coefficient ƛ i is obtained by multiplying the resistance weight value Ɛ 1 by the resistance adjustment coefficient ƛ 1, and adding the result of multiplying the pressure weight value Ɛ 2 by the resistance adjustment coefficient ƛ 2;
(6) According to the current adjustment coefficient ƛ i, the PWM combined waveform is adjusted on the main control board (8) to control the pulse width modulation PWM waveform output by the driving board 9 to carry out change adjustment through a PID control strategy, so that the high-frequency accurate control of the output size of welding current is realized.
1. The current is regulated more quickly and more finely
The invention provides a method and a system for aluminum spot welding based on a high-frequency inversion direct-current resistance welding power supply, which are characterized in that the pulse period is consistent with the inversion period, the secondary current and the voltage are collected when the pulse waveform is effective, each period can be collected for 2 times according to the waveform, the collection of the effective value time can be ensured, the consistency and the quasi-determination of each data collection time are ensured, the collection frequency of an inversion medium-frequency welding machine is limited to the inversion frequency, usually 1KHz or 2KHz, the inversion frequency is 10KHz, 20000 groups of data points can be collected every second according to the collection of the secondary current output waveform, the collection rate of the system is improved, and the welding current can be controlled more accurately.
2. The transformer can be lighter and smaller
According to the induced potential formula of the transformer: e=4.44 fN phi, where: e- -effective value f of induced potential- -frequency N- -turns phi- -maximum value of main magnetic flux; according to the formula, the number of turns and main magnetic flux can be small when the effective value of the induced potential is fixed, and the frequency is high, so that the iron core can be small, the volume of the natural transformer can be small, and the weight can be reduced. Therefore, in the high-frequency direct current-based resistance welding system, the transformer is smaller in size, lighter in weight and more suitable for robot welding than a common inversion medium-frequency welding machine under the same capacity.
3. The welding current is smaller, the welding power supply volume is smaller, and the welding pressure is smaller
The aluminum alloy has high heat conductivity coefficient and large specific heat capacity, the conventional aluminum alloy spot welding process is realized through high current and high pressure, the current generally needs 40-100 KA, so that higher requirements are put on the control and cooling of a resistance welding power supply, high-power rectification and IGBT modules are needed, the design cost of a control system is high, the volume is larger, and good welding can be realized under the conditions that the welding current is 35KA and the pressure is 4-6KN by adopting the method provided by the invention, the power and the volume of the resistance welding power supply are effectively reduced, the effective load of a welding tongs is reduced, and the design of the welding tongs is simplified.
4. Aluminum spot welding can be achieved with conventionally shaped electrodes and electrode dressing frequency can be reduced
The aluminum alloy dissipates heat quickly, the metal welded and melted by the aluminum alloy can react with the copper alloy of the copper electrode electrochemically, so that the electrode is adhered, the welding quality is affected, and the aluminum alloy is required to be polished for 40-70 points generally; in addition, the oxide film is easy to form on the surface of the aluminum alloy metal, the oxide film has high resistivity and high melting point, so that the aluminum alloy spot welding process has higher requirements on welding electrodes.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a high-frequency inversion type DC resistance welding power supply aluminum spot welding system
FIG. 2 is a waveform diagram of the secondary current of the inverter DC resistance welding power supply
FIG. 3 is a flow chart of a method for aluminum spot welding by a high frequency inverted DC resistance welding power supply
FIG. 4 electrode cross-sectional view
Wherein: a resistance welding power supply 1, a high-frequency transformer 2, a high-frequency secondary rectifying unit 3, an electrode unit 4, a pressure monitoring unit 5, a voltage feedback unit 6 and a current feedback unit 7; wherein the resistance welding power supply 1 comprises a main control board 8, a driving board 9 and a power unit 10
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The system comprises a resistance welding power supply 1, a high-frequency transformer 2, a high-frequency secondary rectifying unit 3, an electrode unit 4, a pressure monitoring unit 5, a voltage feedback unit 6 and a current feedback unit 7; the resistance welding power supply 1 comprises a main control board 8, a driving board 9 and a power unit 10; the power unit 10 comprises a primary rectifying module, a filter capacitor, an IGBT and other devices; the pressure monitoring unit is connected with the main control board, so as to realize detection feedback of pressure and control the welding tongs servo motor to pressurize the workpiece according to set pressure; the main control board is connected with the pressure monitoring unit, the voltage feedback unit and the current feedback unit to collect welding pressure, secondary voltage and secondary current.
The resistance welding power supply 1 is a high-frequency inversion resistance welding power supply, the driving board 9 is a high-frequency IGBT driving board, and the main control board 8 is connected with the driving board 9 to control the driving board 9 to carry out high-frequency switching control on the IGBT, wherein the inversion frequency reaches 10KHz; the system works in an inversion high-frequency band, so that the high-frequency transformer 2 and the high-frequency secondary rectifying unit 3 are designed and selected aiming at the high-frequency band;
the main control board 8 is connected with the pressure monitoring unit 5, the voltage feedback unit 6 and the current feedback unit 7, so that the acquisition of welding pressure, secondary voltage and secondary current is realized, the sampling frequency is 2 times of the high-frequency inversion frequency, and 20000 data points can be acquired every second if the inversion frequency is 10KHz, and the more refined control of the welding process is realized.
The IGBT and high-frequency secondary rectification unit 3 of the power unit 10 is a high-frequency IGBT module and a high-frequency rectification module which are adaptive to high-frequency inversion frequency;
the high-frequency transformer 2 adopts a middle tap form, as shown in the secondary voltage device 2 in fig. 1, and the iron core adopts ferrite materials; the current feedback unit 7 adopts an annular rogowski coil and is sleeved at the output end of the high-frequency secondary rectifying unit 3, namely the positive electrode end or the negative electrode end of an output loop;
the main control board 8 controls the driving board 9 to switch and control the IGBT component by outputting pulse width modulation PWM waves, and the inversion frequency is not an intermediate frequency of 1KHz, but is in an inversion high frequency band, and can reach 10KHz;
further, the MCU model on the main control board is STM32F103, and accurate control of secondary signal acquisition time is achieved.
Furthermore, the upper electrode and the lower electrode of the electrode unit are made of chromium-zirconium-copper materials, the diameter d1 of the electrode is 12-18mm, and the end face of the electrode is an arc with the radius R1 being more than 40 mm.
Further, the IGBT and the high-frequency secondary rectification unit of the power unit 10 are a high-frequency IGBT module and a high-frequency rectification module that are adapted to the high-frequency inversion frequency.
Further, the resistance welding power supply is a high-frequency inversion resistance welding power supply, the driving plate is a high-frequency IGBT driving plate, and the main control board is connected with the driving plate to control the driving plate to carry out high-frequency switching control on the IGBT, wherein the inversion frequency reaches 10KHz.
Further, the high-frequency transformer adopts a middle tap form, and the iron core adopts ferrite materials; the current feedback unit adopts an annular rogowski coil and is sleeved at the output end of the high-frequency secondary rectifying unit.
A method for carrying out aluminum spot welding on a direct-current resistance welding power supply based on high-frequency inversion,
1. according to the secondary current fluctuation curve of FIG. 2, in one welding period, the welding current passes through the effective value of 2 times of welding current, a signal at the moment that the current passes through the effective value is connected into an MCU interrupt pin of a main control board, and the model of the MCU is STM32F103, so that the accurate control of the secondary signal acquisition time is realized;
2. sampling output signals of the pressure monitoring unit 5, the voltage feedback unit 6 and the current feedback unit 7 at the terminal moment when the effective value is exceeded, for example, t1, t2, t3, t4, t5, t6, t7, t8, t9, t10 and other moments, wherein the sampling frequency can reach 20KHz, namely 20000 groups of data points are acquired every second;
3. calculating a secondary resistance according to ohm law by the acquired secondary voltage and secondary current, and adjusting an output current resistance weight value Ɛ 1 according to a difference value of the secondary resistance compared with a set resistance curve;
4. adjusting an output current pressure weight value Ɛ according to the difference between the acquired secondary pressure data and the set pressure;
5. the current adjustment coefficient ƛ i is obtained by multiplying the resistance weight value Ɛ 1 by the resistance adjustment coefficient ƛ 1 and adding the result of multiplying the pressure weight value Ɛ 2 by the resistance adjustment coefficient ƛ 2
6. According to the current adjustment coefficient ƛ i, the PWM combined waveform is regulated on the main control board 8 to control the PWM waveform output by the driving board 9 through a PID control strategy, so that the high-frequency accurate control of the output size of the welding current is realized, and the PID regulation frequency can reach 10KHz;
the welding quality is affected by three factors, namely welding current, welding time and welding pressure, at present, all companies mainly monitor the three parameters and perform output control of resistance spot welding according to respective algorithms, and the inversion frequency of the inversion medium-frequency direct-current resistance welder is basically one fixed value in the range of 800-1200Hz for inversion welding, wherein the inversion frequency of 1KHz is most widely applied.
The invention provides a method and a system for carrying out aluminum spot welding based on a high-frequency inversion direct-current resistance welding power supply, which work in an inversion high-frequency band, so that a high-frequency transformer 2 and a high-frequency secondary rectifying unit 3 are designed and selected aiming at the high-frequency band.
Working process
After the welding is started, the main control board invokes corresponding welding standard parameters according to the input signals, and performs welding according to the set welding parameters, wherein the inversion frequency is 10KHz, and the parameters mainly comprise welding current, welding time, pressure values, pressure time and the like related to pressure, such as pre-pressing time, pressurizing time, pressure keeping time and the like.
The master control board 9 controls the welding tongs servo motor to clamp the workpiece and apply set pressure through the pressure monitoring unit 5 in the pre-pressing time and the pressurizing time;
after the welding starts, data acquisition is carried out on the pressure monitoring unit 5, the voltage feedback unit 6 and the current feedback unit 7 at the interruption moment when the current is acquired to be over the effective value, and as inversion reaches 10KHz, the sampling rate can reach 20KHz of high-frequency data acquisition;
according to ohm's law, the data collected by the voltage feedback unit 6 and the current feedback unit 7 are calculated in real time to obtain a secondary resistance value, and the secondary resistance value is compared with a set resistance curve to obtain a deviation value, and the output current resistance weight value Ɛ 1 is adjusted according to the deviation value;
according to the data of the pressure monitoring unit 5 collected in real time, obtaining a deviation value by comparing with a set pressure, and adjusting an output current pressure weight value Ɛ according to the deviation value;
the current adjustment coefficient ƛ i is obtained by multiplying the resistance weight value Ɛ 1 by the resistance adjustment coefficient ƛ 1 and adding the result of multiplying the pressure weight value Ɛ 2 by the resistance adjustment coefficient ƛ 2
According to the current adjustment coefficient ƛ i, the PWM combined waveform is regulated on the main control board 8 to control the PWM waveform output by the driving board 9 through a PID control strategy, so that the high-frequency accurate control of the output size of the welding current is realized, and the PID regulation frequency can reach 10KHz;
finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (7)
1. A spot welding method for an aluminum spot welding system based on a high-frequency inversion direct current resistance welding power supply is characterized by comprising the following steps: the method comprises the following steps:
(1) According to the secondary current fluctuation curve, in a welding period, the welding current passes through the effective value of the welding current for 2 times, and a signal at the moment that the current passes through the effective value is connected into an interrupt pin of a main control board (8);
(2) Sampling output signals of a pressure monitoring unit (5), a voltage feedback unit (6) and a current feedback unit (7) at the terminal moment when the effective value is exceeded;
(3) Calculating a secondary resistance according to ohm law by the acquired secondary voltage and secondary current, and adjusting an output current resistance weight value Ɛ 1 according to a difference value of the secondary resistance compared with a set resistance curve;
(4) Adjusting an output current pressure weight value Ɛ according to the difference between the acquired secondary pressure data and the set pressure;
(5) The current adjustment coefficient ƛ i is obtained by multiplying the resistance weight value Ɛ 1 by the resistance adjustment coefficient ƛ 1, and adding the result of multiplying the pressure weight value Ɛ 2 by the resistance adjustment coefficient ƛ 2;
(6) According to the current adjustment coefficient ƛ i, the PWM combined waveform is regulated on the main control board (8) to control the PWM waveform output by the driving board (9) through a PID control strategy, so that the high-frequency accurate control of the output size of welding current is realized;
the aluminum spot welding system comprises a resistance welding power supply (1), a high-frequency transformer (2), a high-frequency secondary rectifying unit (3), an electrode unit (4), a pressure monitoring unit (5), a voltage feedback unit (6) and a current feedback unit (7); the pressure monitoring unit (5) is connected with the main control board (8) to realize pressure detection feedback and control the welding tongs servo motor to pressurize the workpiece according to the set pressure; the main control board (8) is connected with the pressure monitoring unit (5), the voltage feedback unit (6) and the current feedback unit (7) to collect welding pressure, secondary voltage and secondary current;
the resistance welding power supply (1) comprises a main control board (8), a driving board (9) and a power unit (10).
2. The spot welding method for an aluminum spot welding system based on a high frequency inverter direct current resistance welding power supply according to claim 1, wherein: the power unit (10) comprises a primary rectifying module, a filter capacitor and an IGBT.
3. The spot welding method for an aluminum spot welding system based on a high frequency inverter direct current resistance welding power supply according to claim 1, wherein: MCU model on main control board (8) is STM32F103, realizes the accurate control to secondary signal acquisition time.
4. The spot welding method for an aluminum spot welding system based on a high frequency inverter direct current resistance welding power supply according to claim 1, wherein: the upper electrode and the lower electrode of the electrode unit (4) are made of chromium-zirconium-copper materials, the diameter d1 of the electrode is 12-18mm, and the end face of the electrode is an arc with the radius R1 being more than 40 mm.
5. The spot welding method for an aluminum spot welding system based on the high-frequency inverter direct-current resistance welding power supply according to claim 2, wherein: the IGBT and the high-frequency secondary rectification unit (3) of the power unit (10) are a high-frequency IGBT module and a high-frequency rectification module which are adaptive to high-frequency inversion frequency.
6. The spot welding method for an aluminum spot welding system based on the high-frequency inverter direct-current resistance welding power supply according to claim 2, wherein: the resistance welding power supply (1) is a high-frequency inversion resistance welding power supply, the driving board (9) is a high-frequency IGBT driving board, and the main control board (8) is connected with the driving board (9) to control the driving board (9) to carry out high-frequency switching control on the IGBT, wherein the inversion frequency reaches 10KHz.
7. The spot welding method for an aluminum spot welding system based on the high-frequency inverter direct-current resistance welding power supply according to claim 2, wherein: the high-frequency transformer (2) adopts a middle tap form, and the iron core adopts ferrite materials; the current feedback unit (7) is sleeved at the output end of the high-frequency secondary rectifying unit (3) by adopting an annular Rogowski coil.
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| CN111992865A (en) * | 2020-08-21 | 2020-11-27 | 天津七所高科技有限公司 | Fault detection circuit and method for secondary rectifier module of inverter resistance welding |
| CN113385799A (en) * | 2021-06-30 | 2021-09-14 | 天津七所高科技有限公司 | Dynamic preheating welding method for aluminum alloy spot welding |
| CN114798732B (en) * | 2022-06-30 | 2022-10-21 | 太原理工大学 | Method for regulating interface structure of bimetal laminated composite plate by multi-frequency composite current |
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