CN111975173B - SiC-based double-wire composite ultrahigh-frequency pulse MIG welding power supply system and control method - Google Patents

SiC-based double-wire composite ultrahigh-frequency pulse MIG welding power supply system and control method Download PDF

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Publication number
CN111975173B
CN111975173B CN202010679033.9A CN202010679033A CN111975173B CN 111975173 B CN111975173 B CN 111975173B CN 202010679033 A CN202010679033 A CN 202010679033A CN 111975173 B CN111975173 B CN 111975173B
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power supply
driver
frequency pulse
ultrahigh
value module
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CN111975173A (en
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吴开源
詹家通
曹宣伟
曾煜财
张铭津
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South China University of Technology SCUT
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South China University of Technology SCUT
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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
    • 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
    • B23K9/09—Arrangements or circuits for arc welding with pulsed current or voltage
    • B23K9/091—Arrangements or circuits for arc welding with pulsed current or voltage characterised by the circuits
    • B23K9/092—Arrangements or circuits for arc welding with pulsed current or voltage characterised by the circuits characterised by the shape of the pulses produced
    • 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
    • B23K9/16—Arc welding or cutting making use of shielding gas
    • B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Arc Welding Control (AREA)
  • Arc Welding In General (AREA)

Abstract

The invention discloses a SiC-based dual-wire composite ultrahigh-frequency pulse MIG welding power supply system and a control method thereof, wherein the system comprises a host power supply and a slave power supply which are connected through a CAN bus, the host power supply and the slave power supply respectively comprise a Digital Signal Processor (DSP), a basic value module and a peak value module which are connected in parallel, the Digital Signal Processor (DSP) provides driving signals PWM 1-PWM 4, the driving signals are converted into driving signals Driver 1-Driver 4 through a first driving circuit to control the basic value module, the Digital Signal Processor (DSP) provides driving signals PWM 5-PWM 9, and the driving signals are converted into driving signals Driver 5-Driver 9 through a second driving circuit to control the peak value module. The invention has the advantages of simple structure and easy realization.

Description

SiC-based double-wire composite ultrahigh-frequency pulse MIG welding power supply system and control method
Technical Field
The invention relates to the technical field of welding, in particular to the technical field of high-power twin-wire welding, and particularly relates to a SiC-based twin-wire composite ultrahigh-frequency pulse MIG welding power supply system and a control method.
Background
Most of the existing welding power supplies adopt IGBT or MOSFET silicon (Si) devices as power switching tubes, and compared with the traditional welding power supply, although the energy utilization efficiency is improved and the pulse frequency is higher, the switching frequency is generally 20-200 kHz, the frequency is difficult to be continuously improved, and the high-temperature working capacity is poor. The higher thermal conductivity of silicon carbide (SiC) materials compared to Si materials determines their high current density characteristics, and the higher forbidden bandwidth in turn determines the high breakdown field strength and high operating temperature of SiC devices. The SiC power switch tube has small conduction internal resistance, the switching frequency can reach 1MHz, compared with the traditional IGBT or MOSFET, the conduction loss is obviously reduced, the heat production is less, the switching frequency is higher, the high-frequency welding is facilitated, the maximum working temperature of SiC reaches 600 ℃, and the SiC power switch tube is particularly suitable for the long-time high-strength production environment of a factory.
The double-wire pulse MIG welding can improve the welding efficiency, but the pulse frequency is not high, and double arcs interfere with each other to influence the stability of the welding process, so that the SiC-based double-wire composite ultrahigh-frequency pulse MIG welding power supply system and the control method thereof are provided.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention provides a SiC-based dual-wire composite ultrahigh-frequency pulse MIG welding power supply system, compared with the conventional dual-wire pulse MIG welding, the ultrahigh-frequency pulse MIG welding has higher energy density and higher arc rigidity, the interference between dual arcs can be reduced to a certain extent, the droplet transition stability is improved, and the high-frequency pulse stirring molten pool can obtain finer and more compact weld microstructure.
The invention also provides a control method of the SiC-based double-wire composite ultrahigh-frequency pulse MIG welding power supply system.
The first purpose of the invention is realized by adopting the following technical scheme:
the SiC-based double-wire composite ultrahigh-frequency pulse MIG welding power supply system comprises a host power supply and a slave power supply which are connected through a CAN bus, wherein the host power supply and the slave power supply respectively comprise a Digital Signal Processor (DSP), and the system is characterized by further comprising a basic value module and a peak value module which are connected in parallel, the Digital Signal Processor (DSP) provides PWM signals (PWM) 1-PWM 4, the basic value module is converted into driving signals (Driver 1-Driver 4) through a first driving circuit, the Digital Signal Processor (DSP) provides PWM signals (PWM) 5-PWM 9, and the driving signals (Driver 5-Driver 9) are converted into driving signals (peak value module) through a second driving circuit.
The basic value module comprises a constant current power supply, one end of the basic value constant current power supply is connected with the three-phase alternating current input power grid, and the other end of the basic value constant current power supply is connected with the arc load.
The peak module comprises a peak constant current power supply and a SiC power switch tube, the ultrahigh frequency driving signal Driver9 controls the on and off of the SiC power switch tube, and the ultrahigh frequency driving signal Driver9 converts direct current into ultrahigh frequency pulse square wave current IpConnected to an arc load.
The main circuit topological structure of the base value constant current power supply and the peak value constant current power supply is any one of a hard switch, a phase-shifted full-bridge soft switch, a full-bridge LLC or a half-bridge LLC.
The PWM signal PWM9 is arbitrarily adjustable between 0-1 MHz.
The switching frequency of the SiC power switching tube reaches up to 1 MHz.
The second purpose of the invention is realized by adopting the following technical scheme:
a control method of a double-wire composite ultrahigh-frequency pulse MIG welding power supply system comprises the following steps:
the basic value module outputs direct current under the control of the driving signals Driver 1-Driver 4, and the peak value module continuously outputs ultrahigh frequency pulse current under the control of the driving signals Driver 5-Driver 9, so that the ultrahigh frequency pulse current and the ultrahigh frequency pulse current are combined to form A1An output mode;
the basic value module outputs direct current under the control of driving signals Driver 1-Driver 4, and the peak value module intermittently outputs ultrahigh frequency pulse current under the control of driving signals Driver 5-Driver 9, so that the ultrahigh frequency pulse current and the ultrahigh frequency pulse current are combined to form A2An output mode;
the basic value module outputs low-frequency pulse current under the control of driving signals Driver 1-Driver 4, and the peak value module outputs ultrahigh-frequency pulse current during the basic value period of the low-frequency pulse current under the control of driving signals Driver 5-Driver 9, so that A is formed by combination3An output mode;
the basic value module outputs low-frequency pulse current under the control of driving signals Driver 1-Driver 4, the peak value module outputs ultrahigh-frequency pulse current in the peak period of the low-frequency pulse current under the control of the driving signals Driver 5-Driver 9, and the ultrahigh-frequency pulse current are combined to form A4An output mode;
according to different output modes of the master power supply and the slave power supply, 16 phase modes are formed.
The invention has the beneficial effects that:
(1) the SiC-based double-wire composite ultrahigh-frequency pulse MIG welding power supply system has the advantages of simple structure and easiness in implementation by superposing the ultrahigh-frequency pulse current on the common direct current or low-frequency pulse current;
(2) the invention adopts the ultrahigh frequency pulse current, improves the rigidity of the electric arc, can effectively reduce the interference of double electric arcs and the deviation of the electric arc when welding double wires, is beneficial to improving the stability and controllability of molten drop transition, and the introduction of the ultrahigh frequency pulse strengthens the stirring effect on a molten pool, can achieve the purposes of refining grains, accelerating the floating of bubbles and reducing the occurrence rate of air holes;
(3) the SiC power switch tube has strong high temperature resistance, small conduction internal resistance and less heat generation, and can pass larger current, thereby being particularly suitable for high-power twin-wire welding power supply equipment.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2(a) is a schematic diagram of the parallel connection of the fundamental module and the peak module (hard-switched main circuit) of the present invention;
FIG. 2(b) is a schematic diagram of a main circuit of a phase-shifted full-bridge soft switch for a constant current power supply according to the present invention;
FIG. 2(c) is a schematic diagram of a main circuit of the LLC full-bridge constant current power supply of the invention;
FIG. 2(d) is a schematic diagram of a main circuit of a half-bridge LLC constant current power supply of the invention;
FIG. 3 is a schematic diagram illustrating the connection relationship between the master power supply and the slave power supply in the working process of the present invention;
FIG. 4 shows the basic value module outputting DC current and the peak value module outputting continuous UHF pulse current, which are combined to form A1A pattern output current graph;
FIG. 5 shows that the fundamental module outputs DC current and the peak module outputs discontinuous UHF pulse current, which are combined to form A2A pattern output current graph;
FIG. 6 shows the fundamental module outputting low frequency pulse current, the peak module outputting ultra high frequency pulse current during the fundamental period of the fundamental module, combined to form A3A pattern output current graph;
FIG. 7 shows the fundamental module outputting the low frequency pulse current, the peak module outputting the ultra high frequency pulse current during the peak period of the fundamental module, combined to form A4A pattern output current graph;
FIG. 8 is a host power output A of the present invention1Mode, slave power output A1Mode, combined to form A11A pattern output current graph;
FIG. 9 is a main part of the present inventionMachine power supply output A1Mode, slave power output A2Mode, combined to form A12A pattern output current graph;
FIG. 10 is a host power output A of the present invention1Mode, slave power output A3Mode, combined to form A13A pattern output current graph;
FIG. 11 is a host power output A of the present invention1Mode, slave power output A4Mode, combined to form A14A pattern output current graph;
FIG. 12 is a host power output A of the present invention2Mode, slave power output A1Mode, combined to form A21A pattern output current graph;
FIG. 13 is a host power output A of the present invention2Mode, slave power output A2Mode, combined to form A22A pattern output current graph;
FIG. 14 is a host power output A of the present invention2Mode, slave power output A3Mode, combined to form A23A pattern output current graph;
FIG. 15 is a host power output A of the present invention2Mode, slave power output A4Mode, combined to form A24A pattern output current graph;
FIG. 16 is the host power output A of the present invention3Mode, slave power output A1Mode, combined to form A31A pattern output current graph;
FIG. 17 is a host power output A of the present invention3Mode, slave power output A2Mode, combined to form A32A pattern output current graph;
FIG. 18 is a host power output A of the present invention3Mode, slave power output A3Mode, combined to form A33A pattern output current graph;
FIG. 19 is a host power output A of the present invention3Mode, slave power output A4Mode, combined to form A34A pattern output current graph;
FIG. 20 is a host of the present inventionPower supply output A4Mode, slave power output A1Mode, combined to form A41A pattern output current graph;
FIG. 21 shows the host power output A of the present invention4Mode, slave power output A2Mode, combined to form A42A pattern output current graph;
FIG. 22 is a host power output A of the present invention4Mode, slave power output A3Mode, combined to form A43A pattern output current graph;
FIG. 23 is the host power output A of the present invention4Mode, slave power output A4Mode, combined to form A44The mode outputs the current graph.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.
Examples
As shown in fig. 1, a SiC-based dual-wire composite ultrahigh frequency pulse MIG welding power supply system includes a master power supply and a slave power supply connected by a CAN bus, both of which include a digital signal processor DSP, a base value module and a peak value module connected in parallel.
The basic value module comprises a constant current power supply, one end of the constant current power supply is connected with a three-phase alternating current input power grid, the other end of the constant current power supply is connected with an arc load, the constant current power supply can adopt any one of a hard switch shown in figure 2(a), a phase-shifted full-bridge soft switch shown in figure 2(b), a full-bridge LLC shown in figure 2(c) or a half-bridge LLC shown in figure 2(d) according to actual conditions, and a basic value current I is constantly outputbThe base current may be a direct current or a low-frequency pulse current.
The peak module comprises a peak constant current power supply and a SiC power switch tube V9According to actual conditions, the constant current power supply can adopt main circuit topological structures such as hard switches, phase-shifted full-bridge soft switches, full-bridge LLC (logical Link control) and half-bridge LLC (logical Link control), and constantly outputs direct current to the SiC power switch tube V9。
The main machine power supply and the auxiliary machine power supply are connected through a CAN bus and respectively comprise a basic value module, a first driving circuit, a Digital Signal Processor (DSP), a second driving circuit and a peak value module, wherein the Digital Signal Processor (DSP) provides PWM signals (PWM) 1-PWM 4, the PWM signals are converted into driving signals (Driver 1-Driver 4) to control the basic value module after passing through the first driving circuit, the Digital Signal Processor (DSP) provides PWM signals (PWM) 5-PWM 9, and the PWM signals are converted into driving signals (Driver 5-Driver 9) to control the peak value module after passing through the second driving circuit.
The SiC power switch tube V9Continuously switching on and off under the action of an ultrahigh frequency drive signal Driver9 to convert the direct current into an ultrahigh frequency pulse square wave current IpOutputting; the SiC power switch tube V9The switching frequency is up to 1 MHz.
The basic value module and the peak value module are connected in parallel, and the basic value current IbAnd ultrahigh frequency pulse square wave current IpOverlap by IbpOutputs, acting together on the arc load.
As shown in fig. 3, the master power supply is arc connected to the master and the slave power supply is arc connected to the slave.
As shown in FIG. 4, the basic module outputs DC current under the control of the driving signals Driver 1-Driver 4, and the peak module continuously outputs UHF pulse current under the control of the driving signals Driver 5-Driver 9, so as to form A1An output mode; in this mode, the ultra-high frequency pulse current continuously stirs the molten pool, which is helpful for refining grains and escaping bubbles, and obtaining fine and uniform microstructure, but the fish scale pattern is not obvious.
As shown in FIG. 5, the basic module outputs DC current under the control of the driving signals Driver 1-Driver 4, and the peak module intermittently outputs UHF pulse current under the control of the driving signals Driver 5-Driver 9, so as to form A2An output mode; under the mode, the ultrahigh-frequency pulse current discontinuously stirs the molten pool, so that the flow of liquid metal is accelerated, grains are refined and bubbles escape, a fine and uniform microstructure is obtained, and the fish scale pattern is obvious.
As shown in FIG. 6, the basic value module outputs DC current under the control of the driving signals Driver 1-Driver 4, and the peak value moduleThe block outputs ultrahigh frequency pulse current during the basic value of the low frequency pulse current under the control of the driving signals Driver 5-Driver 9, and the ultrahigh frequency pulse current and the low frequency pulse current are combined to form A3An output mode; in the mode, the ultrahigh-frequency pulse current in the base value stage stirs the molten pool, so that the flow of liquid metal is accelerated, grains are refined, bubbles escape, fine and uniform microstructures are obtained, the welding wire is melted in the peak value stage to fill the welding line, and the fish scale pattern is obvious.
As shown in FIG. 7, the basic module outputs a low frequency pulse current under the control of the driving signals Driver 1-Driver 4, and the peak module outputs an ultra high frequency pulse current during the peak period of the low frequency pulse current under the control of the driving signals Driver 5-Driver 9, which are combined to form A4An output mode; in the mode, the welding wire is melted and filled in the welding seam at the peak stage, and the ultrahigh-frequency pulse current vibrates the molten pool, so that grains are refined, bubbles are escaped, fine and uniform microstructures are obtained, and the fish scale pattern is obvious.
For convenience of explanation, A is adoptedxyIndicates that the host power supply is AxOutput mode, slave power supply is AyAnd an output mode, wherein a 16-phase mode is formed according to different output modes of the master power supply and the slave power supply.
As shown in fig. 8, the master power supply and the slave power supply are both a1Output patterns, combined to form A11An output mode;
as shown in FIG. 9, the host power supply is A1Output mode, slave power supply is A2Output patterns, combined to form A12An output mode;
as shown in FIG. 10, the host power supply is A1Output mode, slave power supply is A3Output patterns, combined to form A13An output mode;
as shown in FIG. 11, the host power supply is A1Output mode, slave power supply is A4Output patterns, combined to form A14An output mode;
as shown in FIG. 12, the host power supply is A2Output mode, slave power supply is A1Output patterns, combined to form A21An output mode;
as shown in fig. 13, the master power supply and the slave power supply are both a2Output patterns, combined to form A22An output mode;
as shown in FIG. 14, the host power supply is A2Output mode, slave power supply is A3Output patterns, combined to form A23An output mode;
as shown in FIG. 15, the host power supply is A2Output mode, slave power supply is A4Output patterns, combined to form A24An output mode;
as shown in FIG. 16, the host power supply is A3Output mode, slave power supply is A1Output patterns, combined to form A31An output mode;
as shown in FIG. 17, the host power supply is A3Output mode, slave power supply is A2Output patterns, combined to form A32An output mode;
as shown in fig. 18, the master power supply and the slave power supply are both a3Output patterns, combined to form A33An output mode;
as shown in FIG. 19, the host power supply is A3Output mode, slave power supply is A4Output patterns, combined to form A34An output mode;
as shown in FIG. 20, the host power supply is A4Output mode, slave power supply is A1Output patterns, combined to form A41An output mode;
as shown in FIG. 21, the host power supply is A4Output mode, slave power supply is A2Output patterns, combined to form A42An output mode;
as shown in FIG. 22, the host power supply is A4Output mode, slave power supply is A3Output patterns, combined to form A43An output mode;
as shown in fig. 23, the master power supply and the slave power supply are both a4Output patterns, combined to form A44And outputting the mode.
According to the SiC-based double-wire composite ultrahigh-frequency pulse MIG welding power supply system and the control method thereof, the ultrahigh-frequency pulse current is superposed on the common direct current or low-frequency pulse current, so that the system has the advantages of simple structure and easiness in implementation; the adoption of the ultrahigh frequency pulse current improves the rigidity of electric arcs, can effectively reduce the interference of double electric arcs and the deviation of the electric arcs when welding double wires, is beneficial to improving the stability of molten drop transition, and the introduction of the ultrahigh frequency pulse strengthens the stirring effect on a molten pool, can achieve the purposes of refining grains, accelerating the floating of bubbles and reducing the occurrence rate of air holes. The SiC power switch tube has strong high temperature resistance, small conduction internal resistance and less heat generation, and can pass larger current, thereby being particularly suitable for high-power twin-wire welding power supply equipment.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims (6)

1. The SiC-based double-wire composite ultrahigh-frequency pulse MIG welding power supply system comprises a host power supply and a slave power supply which are connected through a CAN bus, wherein the host power supply and the slave power supply respectively comprise a Digital Signal Processor (DSP), and the system is characterized in that the host power supply and the slave power supply also comprise a basic value module and a peak value module which are connected in parallel, the Digital Signal Processor (DSP) provides PWM signals PWM 1-PWM 4, the PWM signals are converted into driving signals Driver 1-Driver 4 to control the basic value module after passing through a first driving circuit, the Digital Signal Processor (DSP) provides PWM signals PWM 5-PWM 9, and the PWM signals are converted into driving signals Driver 5-Driver 9 to control the peak value module after passing through a second driving circuit; the PWM signal PWM9 is an ultrahigh frequency PWM signal, the PWM signal PWM9 is adjustable at will between 0 and 1MHz, and the PWM signal PWM9 is converted into an ultrahigh frequency driving signal Driver9 after passing through a second driving circuit;
the peak module comprises a peak constant current power supply and a SiC power switch tube, the ultrahigh frequency driving signal Driver9 controls the on and off of the SiC power switch tube, and the direct current is converted into ultrahigh frequencyPulse square wave currentI pAnd the device is connected with an arc load, so that the super-frequency pulse current is superposed on the common direct current or low-frequency pulse current.
2. The SiC-based dual-wire composite ultrahigh frequency pulse MIG welding power supply system of claim 1 wherein the basis value module includes a basis value constant current power supply having one end connected to a three phase ac input grid and the other end connected to an arc load.
3. The SiC-based dual-wire composite ultrahigh-frequency pulse MIG welding power supply system of claim 2, wherein a main circuit topology of the base constant-current power supply and the peak constant-current power supply is any one of a hard switch, a phase-shifted full-bridge soft switch, a full-bridge LLC, or a half-bridge LLC.
4. The SiC-based dual wire composite uhf pulse MIG welding power supply system of claim 1 wherein the switching frequency of the SiC power switching tube is up to 1 MHz.
5. A method of controlling a power system for a SiC-based twin-wire composite UHF pulse MIG welding power supply according to any one of claims 1 to 4,
the basic value module outputs direct current under the control of the driving signals Driver 1-Driver 4, and the peak value module continuously outputs ultrahigh frequency pulse current under the control of the driving signals Driver 5-Driver 9, so that the ultrahigh frequency pulse current and the ultrahigh frequency pulse current are combined to form A1An output mode;
the basic value module outputs direct current under the control of driving signals Driver 1-Driver 4, and the peak value module intermittently outputs ultrahigh frequency pulse current under the control of driving signals Driver 5-Driver 9, so that the ultrahigh frequency pulse current and the ultrahigh frequency pulse current are combined to form A2An output mode;
the basic value module outputs low-frequency pulse current under the control of driving signals Driver 1-Driver 4, and the peak value module outputs ultrahigh-frequency pulse current during the basic value period of the low-frequency pulse current under the control of driving signals Driver 5-Driver 9, so that A is formed by combination3An output mode;
the basic value module outputs low-frequency pulse current under the control of driving signals Driver 1-Driver 4, the peak value module outputs ultrahigh-frequency pulse current in the peak period of the low-frequency pulse current under the control of the driving signals Driver 5-Driver 9, and the ultrahigh-frequency pulse current are combined to form A4And outputting the mode.
6. The control method according to claim 5, wherein 16 phase patterns are formed according to different output patterns of the master power supply and the slave power supply.
CN202010679033.9A 2020-07-15 2020-07-15 SiC-based double-wire composite ultrahigh-frequency pulse MIG welding power supply system and control method Expired - Fee Related CN111975173B (en)

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