CN112059368A - Multi-power-supply parallel control method and device and welding equipment - Google Patents
Multi-power-supply parallel control method and device and welding equipment Download PDFInfo
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- CN112059368A CN112059368A CN202010985017.2A CN202010985017A CN112059368A CN 112059368 A CN112059368 A CN 112059368A CN 202010985017 A CN202010985017 A CN 202010985017A CN 112059368 A CN112059368 A CN 112059368A
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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
- B23K9/00—Arc welding or cutting
- B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
- B23K9/1006—Power supply
- B23K9/1075—Parallel power supply, i.e. multiple power supplies or multiple inverters supplying a single arc or welding current
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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
- B23K9/00—Arc welding or cutting
- B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
- B23K9/1006—Power supply
- B23K9/1043—Power supply characterised by the electric circuit
- B23K9/1056—Power supply characterised by the electric circuit by using digital means
Abstract
The disclosure relates to the technical field of electric arc welding, and provides a multi-power-supply parallel control method and device and welding equipment. The multi-power-supply parallel control method is applied to welding equipment with a plurality of welding power supplies connected in parallel, and comprises the following steps: determining a constant voltage source as a master power source and at least one constant current source as a slave power source according to external characteristics of a plurality of welding power sources; distributing the welding voltage to the master power source and the welding current to the master power source and the slave power source according to the welding voltage and the welding current; and during welding, performing constant voltage control on the welding voltage through the main power supply, and performing current output through the main power supply and the auxiliary power supply respectively based on the welding currents distributed respectively. The multi-power-supply parallel control method, the multi-power-supply parallel control device and the welding equipment can realize stable welding of multi-power-supply parallel connection and increase deposition efficiency.
Description
Technical Field
The disclosure relates to the technical field of electric arc welding, in particular to a multi-power-supply parallel control method and device and welding equipment.
Background
The welding technology, such as arc welding, has higher and higher requirements on deposition efficiency, which is the ratio of the weight of a welding wire entering a workpiece per unit time to the weight of a molten welding wire, mainly depends on welding energy, and can obtain high deposition efficiency in high-current welding.
The existing welding equipment adopts a single welding power supply for energy supply, is limited by rated parameters of the welding power supply, has limited welding energy which can be provided by the welding power supply, cannot carry out heavy-current welding, causes the deposition efficiency to be greatly limited, and cannot meet the requirement of arc welding on high deposition efficiency.
It is noted that the information disclosed in the background section above is only for enhancement of understanding of the background of the present disclosure, and therefore, may include information that does not constitute prior art that is known to those of ordinary skill in the art.
Disclosure of Invention
In view of the above, the present disclosure provides a multi-power-supply parallel control method, apparatus, and welding device, which can achieve stable welding with multi-power-supply parallel connection and increase deposition efficiency.
One aspect of the present disclosure provides a multi-power parallel control method applied to a welding apparatus having a plurality of welding power sources connected in parallel, the multi-power parallel control method including the steps of: determining a constant voltage source as a master power source and at least one constant current source as a slave power source according to external characteristics of a plurality of welding power sources; distributing the welding voltage to the master power source and the welding current to the master power source and the slave power source according to the welding voltage and the welding current; and during welding, performing constant voltage control on the welding voltage through the main power supply, and performing current output through the main power supply and the auxiliary power supply respectively based on the welding currents distributed respectively.
In some embodiments, during an arc initiation phase of the welding process, the step of performing a current output comprises: controlling the main power supply to output arc striking pulse current; controlling the output current from the power source to be incremented to its assigned welding current.
In some embodiments, during a main welding phase of the welding process, the step of making a current output comprises: controlling the main power supply to output a pulsed current that matches a wire feed speed of a wire feeder of the welding apparatus; controlling the slave power source to output a constant current equal to its allocated welding current.
In some embodiments, during a burn-back phase of the welding process, the step of making a current output comprises: controlling the main power supply to output a burn-back pulse current; controlling the output current decreasing from the power supply output to zero.
In some embodiments, the output current of the slave power supply is controlled to be graded as a linear function over time.
Another aspect of the present disclosure provides a multi-power parallel control apparatus applied to a welding device having a plurality of welding power sources connected in parallel, the multi-power parallel control apparatus including: a power supply determination module configured to determine a constant voltage source as a master power supply and at least one constant current source as a slave power supply based on external characteristics of a plurality of welding power supplies; a parameter distribution module configured to distribute a welding voltage to the master power source and a welding current to the master power source and the slave power source based on the welding voltage and the welding current; and an output control module configured to perform constant voltage control of the welding voltage by the master power supply and perform current output by the master power supply and the slave power supply based on respective distributed welding currents during welding.
In some embodiments, the output control module comprises: an arc initiation control unit configured to control the main power source to output an arc initiation pulse current and to control the output current from the power source to be incrementally increased to its allocated welding current during an arc initiation phase of the welding process.
In some embodiments, the output control module comprises: a primary welding control unit configured to control the primary power source to output a pulsed current matching a wire feed speed of a wire feeder of the welding apparatus and to control the secondary power source to output a constant current equal to its allocated welding current during a primary welding phase of the welding process.
In some embodiments, the output control module comprises: and the burn-back control unit is configured to control the main power supply to output a burn-back pulse current and control the output current which is decreased to zero from the power supply output in the burn-back stage of the welding process.
Yet another aspect of the present disclosure provides a welding apparatus, comprising: a plurality of welding power sources connected in parallel; the multi-power-supply parallel control apparatus according to any of the above embodiments, which is connected to each of the welding power supplies, has a setting interface for setting external characteristics of the plurality of welding power supplies, the welding voltage, and the welding current; and the wire feeding device is connected with the main power supply and the first electrode of the parallel output end of the slave power supply, is also connected with the control interface of the main power supply so as to determine the wire feeding speed according to the control signal of the control interface, and the second electrode of the parallel output end is used for connecting a workpiece.
Compared with the prior art, the beneficial effects of this disclosure include at least:
the constant voltage source is determined as a main power source, the welding voltage is distributed to the main power source, and the main power source performs constant voltage control on the welding voltage in the welding process, so that the stability of the arc length in the welding process is ensured, and the stable welding with multiple parallel power sources is realized;
the at least one constant current source is determined as the slave power source, partial welding current is distributed to the slave power source, the slave power source supplements and outputs the welding current in the welding process, so that the output current of the parallel output end of the master power source and the slave power source is greatly improved, the welding energy provided by the parallel master power source and the slave power source is greatly improved, the deposition efficiency is greatly improved, and the requirement of arc welding on high deposition efficiency is met.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is apparent that the drawings described below are only some embodiments of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without inventive effort.
FIG. 1 is a schematic diagram illustrating steps of a multi-power parallel control method in an embodiment of the present disclosure;
FIG. 2 illustrates a schematic diagram of output waveforms of the master and slave power sources at various stages of the welding process in an embodiment of the present disclosure;
FIG. 3 shows a block schematic diagram of a multi-power parallel control apparatus in an embodiment of the disclosure;
FIG. 4 is a schematic diagram illustrating the constituent elements of an output control module in an embodiment of the present disclosure; and
fig. 5 shows a schematic structural diagram of a welding apparatus in an embodiment of the present disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.
Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
The use of "first," "second," and similar terms in the detailed description is not intended to imply any order, quantity, or importance, but rather is used to distinguish one element from another. It should be noted that features of the embodiments of the disclosure and of the different embodiments may be combined with each other without conflict.
The multi-power-supply parallel control method is applied to welding equipment with a plurality of parallel welding power supplies, solves the problems that the existing single-power-supply welding equipment cannot improve welding energy and meet high deposition efficiency, realizes multi-power-supply parallel stable welding, and increases deposition efficiency.
The welding equipment disclosed by the disclosure is consumable electrode gas shielded welding equipment, an electric arc generated between a welding wire and a workpiece is used as a heat source, the welding wire and the workpiece are melted to form a molten pool, and a shielding gas is conveyed to a welding area, so that the electric arc, the melted welding wire, the molten pool and the nearby workpiece are protected. Since the specific principle of the gas metal arc welding is known, the present disclosure will not be explained below, but will be described mainly about the multiple power supply parallel control.
Fig. 1 shows the main steps of a multi-power-supply parallel control method in the embodiment, and referring to fig. 1, the multi-power-supply parallel control method in the embodiment mainly includes: in step S110, according to external characteristics of a plurality of welding power sources, a constant voltage source is determined as a master power source, and at least one constant current source is determined as a slave power source; in step S120, distributing the welding voltage to the master power source, the welding current to the master power source and the slave power source according to the welding voltage and the welding current; and in step S130, during welding, performing constant voltage control of the welding voltage by the main power supply, and performing current output by the main power supply and the sub power supply based on the welding currents respectively allocated thereto.
In the welding equipment, a plurality of welding power supplies can be particularly connected with a multi-power-supply parallel control device, and the external characteristics of each welding power supply can be set according to welding requirements through the multi-power-supply parallel control device. When the multi-power-supply parallel control device determines the master power supply and the slave power supply, the welding power supply set as a constant voltage source, particularly a direct current constant voltage source, is used as the master power supply, and the welding power supply set as a constant current source, particularly a direct current constant current source, is used as the slave power supply.
Through the multi-power-supply parallel control device, welding parameters including welding voltage and welding current can be set according to welding requirements. The multi-power-supply parallel control device distributes welding voltage to the main power supply according to set welding parameters, distributes welding current to the main power supply and the auxiliary power supply according to a preset current distribution mode, and generally enables the welding current distributed to the main power supply to be larger than or equal to the welding current distributed to the auxiliary power supply. For example, in one particular example, welding parameters are set to 400A-40V by the multi-power parallel control prior to welding, the multi-power parallel control automatically assigns welding parameters to 300A-40V to the master power source and a welding current to 100A to the slave power source.
During welding, the output voltage of the parallel output ends of the main power supply and the slave power supply depends on the output voltage of the main power supply, and the welding voltage is controlled by the main power supply in a constant voltage mode. The welding voltage specifically refers to the voltage at the arc position, and in the welding process, the main power supply adjusts the output voltage according to the arc voltage feedback, so that the constant voltage control of the welding voltage is realized, the arc length is ensured to be stable, the stable welding with multiple power supplies connected in parallel is realized, and the welding quality is improved.
The welding current is supplemented and output from the power supply, the output current of the parallel output end is the sum of the output current of the main power supply and the output current of the slave power supply, so that the output current of the parallel output end is greatly improved, and the welding energy provided by the parallel main power supply and the slave power supply is greatly improved, thereby greatly improving the deposition efficiency and meeting the requirement of arc welding on high deposition efficiency.
Fig. 2 shows an example of the output waveforms of the master and slave power sources at different stages of the welding process. Referring to fig. 2, the welding process includes an arc initiation phase 210, a main welding phase 220, and a burn back phase 230. The output voltage of the main power supply corresponds to the area A, namely the output voltage of the parallel output end; the output current of the main power supply corresponds to the area B, and the output current of the auxiliary power supply corresponds to the area C; the output current of the parallel output end is the sum of the output current of the main power supply and the output current of the slave power supply, and corresponds to the D area.
In the welding apparatus according to the embodiment of the present disclosure, the output voltage of the parallel output terminal depends on the output voltage of the main power supply, and the output voltage waveform of the main power supply is the same as the output voltage waveform of the existing single power supply welding apparatus, and includes the arc striking waveform of the arc striking stage 210, the constant voltage adjustment waveform of the main welding stage 220 based on the arc voltage feedback, and the burn-back waveform of the burn-back stage 230 shown in fig. 2, which are not described again.
The output current at different stages will be described with reference to fig. 2.
First, during an arc initiation phase 210 of the welding process, the step of providing current outputs from the primary power source and the secondary power source, respectively, based on respective assigned welding currents comprises: controlling a main power supply to output arc striking pulse current, wherein the arc striking pulse current is generally larger than welding current distributed to the main power supply in the same way as the current waveform of the existing arc striking stage and is used for realizing smooth arc striking; at the same time, the output current is controlled from the power supply output incrementally to its assigned welding current.
In one particular example, the output current from the power supply is controlled to increase with a slope as a function of time. Specifically, the slave power supply may be controlled to press I ═ k1*t1Output current, where I is the real-time output current from the power supply, k1Is a first scale factor, t1The moments of the arc initiation phase. In other examples, the manner in which the output current from the power supply is incremented is not limited to a linear function.
Then, during a primary welding phase 220 of the welding process, the step of providing current outputs from the primary power source and the secondary power source, respectively, based on the respective assigned welding currents includes: the main power supply is controlled to output pulse current matched with the wire feeding speed of a wire feeding device of the welding equipment, namely the wire feeding speed is controlled by the main power supply so as to achieve the set welding current and the welding energy provided by the welding voltage and enable the welding wire to be stably combusted; the output current of the main power supply is now equal to its allocated welding current. And meanwhile, controlling the power supply to output a constant current equal to the distributed welding current so that the output current of the parallel output end is matched with the set welding current.
Finally, during a burn-back phase of the welding process, the step of providing current outputs from the power source and the primary power source based on respective assigned welding currents includes: controlling a main power supply to output a burn-back pulse current, wherein the burn-back pulse current is generally larger than the welding current distributed to the main power supply and smaller than the arc striking current in the same way as the current waveform of the existing burn-back stage, and is used for burn-back of welding wires and preventing the wire sticking phenomenon after welding; at the same time, the output current is controlled to decrease from the power supply output to zero.
In one particular example, the output current from the power supply is controlled to decrease with a slope as a function of time. Specifically, the slave power supply may be controlled to press I ═ k2*t2Output current, where I is the real-time output current from the power supply, k2Is the second proportionality coefficient, t2The time of the burn-back stage. In other examples, the manner in which the output current from the power supply is decremented is not limited to a linear function.
The control main power supply performs constant voltage adjustment on welding voltage, and the control main power supply and the slave power supply perform current output based on welding current distributed by the control main power supply and the slave power supply can be realized by a multi-power-supply parallel control device.
The embodiment of the disclosure also provides a multi-power-supply parallel control device, which is applied to welding equipment with a plurality of welding power supplies connected in parallel and can be used for executing the multi-power-supply parallel control method. Fig. 3 shows the main blocks of the multi-power-supply parallel control apparatus in the embodiment, and referring to fig. 3, the multi-power-supply parallel control apparatus in the embodiment includes: a power determination module 310 configured to determine a constant voltage source as a master power source and at least one constant current source as a slave power source according to external characteristics of a plurality of welding power sources; a parameter distribution module 320 configured to distribute a welding voltage to the master power source, a welding current to the master and slave power sources based on the welding voltage and the welding current; and an output control module 330 configured to perform constant voltage control of the welding voltage through the main power source and perform current output through the main power source and the sub power source based on the welding currents respectively allocated thereto during the welding process.
The multi-power-supply parallel control device is connected with each welding power supply, the external characteristics of each welding power supply can be set through the multi-power-supply parallel control device, and the multi-power-supply parallel control device takes the constant voltage source as a main power supply and the constant current source as a slave power supply according to the set external characteristics of the power supplies.
The multi-power-supply parallel control device can also set welding parameters, distribute welding voltage to the main power supply and distribute welding current to the main power supply and the secondary power supply according to the set welding parameters, so that the welding voltage is subjected to constant voltage control by the main power supply in the welding process, the arc length is stable, and the multi-power-supply parallel stable welding is realized; the welding current is supplemented and output from the power supply, so that the output current of the parallel output end is greatly improved, and the welding energy provided by the parallel main power supply and the slave power supply is greatly improved, thereby greatly improving the deposition efficiency and meeting the requirement of arc welding on high deposition efficiency.
Fig. 4 shows the main components of the output control module in the embodiment, and referring to fig. 4, the output control module may specifically include:
and an arc initiation control unit 410 for controlling the main power source to output an arc initiation pulse current and controlling an output current from the power source to be incrementally increased to its assigned welding current during an arc initiation phase of the welding process.
A primary welding control unit 420 for controlling the primary power source to output a pulsed current matching the wire feed speed of the wire feeder of the welding apparatus and the secondary power source to output a constant current equal to its allocated welding current during the primary welding phase of the welding process.
And a burn-back control unit 430, configured to control the main power supply to output a burn-back pulse current and control an output current decreasing from the power supply output to zero in a burn-back stage of the welding process.
For details not specifically developed in the multi-power-supply parallel control device, please refer to the above-mentioned embodiment of the multi-power-supply parallel control method, and a description thereof will not be repeated.
The embodiment of the present disclosure further provides a welding device, fig. 5 shows a main structure of the welding device, and referring to fig. 5, the welding device specifically includes the following components:
a plurality of welding power sources connected in parallel, two welding power sources being illustrated in fig. 5, but not limited thereto.
The multi-power parallel control device 530 as described in the above embodiment is connected to each welding power source, and the multi-power parallel control device 530 has a setting interface for setting external characteristics of the plurality of welding power sources and welding parameters including welding voltage and welding current. Through the setting interface of the multi-power supply parallel control device 530, a user can set related welding functions according to welding requirements, the multi-power supply parallel control device 530 determines that the constant voltage source is the main power supply 510 and the constant current source is the secondary power supply 520 according to the received setting information, and distributes welding voltage to the main power supply 510, so that the main power supply 510 performs constant voltage control on the welding voltage in the welding process, and the arc length is ensured to be stable; the welding current is distributed to the main power supply 510 and the sub power supply 520, the main power supply 510 and the sub power supply 520 respectively output current based on the distributed welding current in the welding process, the output current of the parallel output ends of the main power supply 510 and the sub power supply 520 is increased, and the deposition efficiency of the welding wire is improved.
Further, other welding functions, such as selection of welding material, wire diameter, gas detection, etc., may be set through the setting interface of the multi-power parallel control device 530.
A wire feeder 540 connected to the primary power source 510 and the first electrode of the parallel output of the secondary power source 520, the wire feeder 540 being shown in fig. 5 connected to the primary power source 510 and the positive electrode of the parallel output of the secondary power source 520. The wire feeder 540 is also connected to the control interface 5100 of the main power supply 510 to determine the wire feed speed based on control signals from the control interface 5100. A second electrode, illustrated as a negative electrode in fig. 5, of the parallel output of the primary power supply 510 and the secondary power supply 520 is used to connect the workpiece 550.
The welding apparatus further comprises a welding torch 560 connected to an output of the wire feeder 540, the wire feeder 540 delivering a welding wire 570 for welding to the workpiece 550 via the welding torch 560, the welding wire 570 being a filler material; and a gas cylinder 580 coupled to the wire feeder 540 for providing a protective atmosphere during welding.
Specifically, during welding, the arc 580 is used as a heat source to melt the welding area of the welding wire 570 and the workpiece 550, so as to form a molten pool; meanwhile, protective gas is continuously sprayed from a nozzle of the welding gun 560 to perform isolation protection on the electric arc and the molten pool in the welding area, so that the welding quality is improved.
In summary, according to the multi-power-supply parallel control method, the multi-power-supply parallel control device and the welding equipment provided by the disclosure, the constant voltage source is used as the main power supply, the welding voltage is distributed to the main power supply, the main power supply performs constant voltage control on the welding voltage in the welding process, the arc length is ensured to be stable, and the multi-power-supply parallel stable welding is realized; at least one constant current source is used as a slave power source, partial welding current is distributed to the slave power source, the slave power source supplements and outputs the welding current in the welding process, so that the output current of a parallel output end is greatly improved, the welding energy provided by a parallel main power source and the slave power source is greatly improved, the deposition efficiency is greatly improved, and the requirement of arc welding on high deposition efficiency is met.
The foregoing is a more detailed description of the present disclosure in connection with specific preferred embodiments, and it is not intended that the specific embodiments of the present disclosure be limited to these descriptions. For those skilled in the art to which the disclosure pertains, several simple deductions or substitutions may be made without departing from the concept of the disclosure, which should be considered as falling within the protection scope of the disclosure.
Claims (10)
1. A multi-power-supply parallel control method applied to a welding apparatus having a plurality of welding power supplies connected in parallel, comprising the steps of:
determining a constant voltage source as a master power source and at least one constant current source as a slave power source according to external characteristics of a plurality of welding power sources;
distributing the welding voltage to the master power source and the welding current to the master power source and the slave power source according to the welding voltage and the welding current; and
during welding, the welding voltage is subjected to constant voltage control by the main power supply, and current output is performed by the main power supply and the auxiliary power supply based on respective distributed welding currents.
2. The multiple power supply parallel control method according to claim 1, wherein the step of performing current output in an arc striking phase of the welding process comprises:
controlling the main power supply to output arc striking pulse current;
controlling the output current from the power source to be incremented to its assigned welding current.
3. The multiple power supply parallel control method according to claim 1, wherein the step of performing current output in a main welding stage of the welding process comprises:
controlling the main power supply to output a pulsed current that matches a wire feed speed of a wire feeder of the welding apparatus;
controlling the slave power source to output a constant current equal to its allocated welding current.
4. The multiple power supply parallel control method according to claim 1, wherein the step of performing current output in a burn-back stage of the welding process comprises:
controlling the main power supply to output a burn-back pulse current;
controlling the output current decreasing from the power supply output to zero.
5. A multiple power supply parallel control method according to claim 2 or 4, wherein the output current of the slave power supply is controlled to be varied in a stepwise manner as a function of time.
6. A multi-power-supply parallel control apparatus applied to a welding device having a plurality of welding power supplies connected in parallel, comprising:
a power supply determination module configured to determine a constant voltage source as a master power supply and at least one constant current source as a slave power supply based on external characteristics of a plurality of welding power supplies;
a parameter distribution module configured to distribute a welding voltage to the master power source and a welding current to the master power source and the slave power source based on the welding voltage and the welding current; and
and an output control module configured to perform constant voltage control of the welding voltage by the master power supply and perform current output by the master power supply and the slave power supply based on respective distributed welding currents during welding.
7. The multi-power-supply parallel control apparatus according to claim 6, wherein the output control module includes:
an arc initiation control unit configured to control the main power source to output an arc initiation pulse current and to control the output current from the power source to be incrementally increased to its allocated welding current during an arc initiation phase of the welding process.
8. The multi-power-supply parallel control apparatus according to claim 6, wherein the output control module includes:
a primary welding control unit configured to control the primary power source to output a pulsed current matching a wire feed speed of a wire feeder of the welding apparatus and to control the secondary power source to output a constant current equal to its allocated welding current during a primary welding phase of the welding process.
9. The multi-power-supply parallel control apparatus according to claim 6, wherein the output control module includes:
and the burn-back control unit is configured to control the main power supply to output a burn-back pulse current and control the output current which is decreased to zero from the power supply output in the burn-back stage of the welding process.
10. A welding apparatus, comprising:
a plurality of welding power sources connected in parallel;
the multiple power supply parallel control apparatus according to any one of claims 6 to 9, connected to each of the welding power supplies, the multiple power supply parallel control apparatus having a setting interface for setting external characteristics, the welding voltage, and the welding current of a plurality of the welding power supplies; and
the wire feeding device is connected with the main power supply and the first electrode of the parallel output end of the slave power supply, the wire feeding device is further connected with the control interface of the main power supply so as to determine the wire feeding speed according to the control signal of the control interface, and the second electrode of the parallel output end is used for being connected with a workpiece.
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| CN112427778A (en) * | 2020-11-12 | 2021-03-02 | 唐山松下产业机器有限公司 | Multi-power-supply parallel welding system |
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