CN105269117A - High-power double-wire pulse MIG welding low-frequency modulation type double-pulse control system - Google Patents
High-power double-wire pulse MIG welding low-frequency modulation type double-pulse control system Download PDFInfo
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- CN105269117A CN105269117A CN201510713907.7A CN201510713907A CN105269117A CN 105269117 A CN105269117 A CN 105269117A CN 201510713907 A CN201510713907 A CN 201510713907A CN 105269117 A CN105269117 A CN 105269117A
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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
- B23K9/09—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
- B23K9/093—Arrangements or circuits for arc welding with pulsed current or voltage characterised by the circuits the frequency of the pulses produced being modulatable
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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
- B23K9/32—Accessories
Abstract
The invention discloses a high-power double-wire pulse MIG welding low-frequency modulation type double-pulse control system. The system comprises a main engine power supply for supplying current to a front wire and cooperatively controlling the whole system, and a slave engine power supply for supplying current to a back wire, wherein a main engine and the slave engine power supply are connected through a CAN bus; the main engine power supply and the slave engine power supply respectively comprise two main circuits and control circuits; one ends of the two main circuits are connected with three-phase alternating current, and the other ends are connected with an electric arc load after parallel connection; the main circuits comprise power conversion modules; and the control circuits comprise human-computer interface modules, DSP digital cooperation control modules, high-frequency driving modules and voltage current detecting modules. The system can realize synchronous, alternating and random three types of low-frequency modulation type double pulses, and uses two ways of low-frequency modulation type double pulses of main and slave engines for acting on high-power double arcs and double-wire molten drops and causing the molten pool resonance to improve the welding process stability, to optimize the welding line structure and to improve the welding line forming quality.
Description
Technical field
The present invention relates to high efficiency welding technology field, particularly high-power mariages pulse MIC welding technical field, be specifically related to a kind of high-power mariages pulse MIC welding low frequency modulations type dipulse control system.
Background technology
As the important support point of solder technology innovation, improve deposition efficiency when high efficiency welding is mainly reflected in welding slab, improve quality of weld joint.Realize high efficiency welding, key is the further raising of welding current.High-power mariages pulse MIC welding is one of major way of high efficiency welding, obvious advantage is had than traditional mariages pulse MIC welding, the big current (pulse peak current is greater than 630A) that the source of welding current exports acts on welding wire, principal and subordinate's electric arc can form a molten bath, the molten drop of two electric arc generation project transfer makes molten bath wide and deeply, can significantly improve welding efficiency.But high-power mariages pulse MIC welding adopts High-current output, the magnetic field intensity that electric current produces increases, and twin arc interaction force is increased, and causes serious twin arc interference; The heat input of high-power mariages pulse MIC welding to material is large, therefore causes weld metal zone and heat affected area coarse grains, seriously reduces the toughness of material, need to heat-treat after some structure weldings, make it apply and be restricted.Low frequency modulations type dipulse is a kind of new process designed on the basis of conventional pulse.Two kinds of pulse reciprocations of low frequency modulations type dipulse can optimize the high-power twin arc interference of high-power mariages pulse MIC welding and quality of weld seam molding.Weld about the welding of monofilament pulse and monofilament low frequency modulations type dipulse at present and mariages pulse welding existing more research both at home and abroad, but still belong to blank about the research of high-power mariages pulse MIC welding low frequency modulations type dipulse welding.High-power mariages pulse MIC welding low frequency modulations type dipulse welding can improve quality of weld seam molding and welding efficiency.
As can be seen here, existing high-power mariages pulse MIC welding technology, mainly contains the shortcoming of the following aspects:
(1) high-power mariages pulse MIC welding is due to close together between mariages, if the electric current rule in conventional Double Wire Welding is applied to big current double wire welding, namely the two-way pulse current of Double Wire Welding is just increased merely, so the magnetic field that produces of electric current is by corresponding increase, twin arc interaction force is increased, cause serious twin arc interference, disturbed condition increases with power and increases further, the intermittent current interruption of twin arc occurs often, cause welding process unstable, the high efficiency welding process that cannot realize ideal, welding effect is poorer than conventional below 630A mariages pulse MIC welding, even poorer than single arc welding, the advantage of high-power double wire welding cannot be embodied.
(2) the heat input of high-power mariages pulse MIC welding to material is large, causes weld metal zone and heat affected area coarse grains, seriously reduces the toughness of material, need to heat-treat after some structure weldings, make it apply and be restricted.
At present about the welding of monofilament pulse, the welding of monofilament low frequency modulations type dipulse and mariages pulse welding existing more research both at home and abroad, but still belong to blank about the research of high-power mariages pulse MIC welding low frequency modulations type dipulse welding.Such as, " process characteristic of low frequency modulations type pulse MIC welding method " (Tong Hongjun in prior art documents and materials, intelligence of going up a hill it. welding, 2001.11), although this welding method can obtain fish scale-shaped face of weld attractive in appearance, expansion can the scope in plumb joint gap, the generation of effective suppression weld blowhole defect, crystal grain thinning, reduce crack sensitivity, but be only confined to the monofilament pulse MIC welding that peak point current is less than 630A, it not mariages pulse MIC welding, the high-power mariages pulse MIC welding that its power output is applied much smaller than the present invention, high efficiency welding can not be realized.
Summary of the invention
In order to overcome the shortcoming of prior art existence with not enough, the invention provides a kind of high-power mariages pulse MIC welding low frequency modulations type dipulse control system.
The present invention acts on high-power mariages pulse MIC welding process by low frequency modulations type dipulse, regulate field intensity and the distribution situation of twin arc current field, optimize the interaction situation of the electromagnetic force between high-power twin arc, reduce high-power twin arc mutually to disturb, by changing the output phase relation of mariages, strengthen melting bath stirring, reduce the occurrence probability of gas hole defect, reduce thermal output simultaneously, refinement weld metal zone and heat affected area crystal grain, obtain scalelike mark weld seam attractive in appearance, thus improve welding process stability, optimize welding line tissue and improve quality of weld seam molding.
Technical scheme of the present invention:
A kind of high-power mariages pulse MIC welding low frequency modulations type dipulse control system, comprise for front silk electric current is provided and the host power supply of Collaborative Control whole system and for rear silk provide electric current from electromechanical source, described main frame is connected by CAN with from electromechanical source;
Described host power supply and include two main circuits and control circuit from electromechanical source, described two main circuit one end are connected with three-phase alternating current, and be connected with arc load after other end parallel connection, described main circuit comprises power conversion modules;
Described control circuit comprises human-computer interface module, DSP digital coordination control module, high-frequency drive module and measure voltage & current module;
Described one end of high-frequency drive module is connected with one end of power conversion modules, and the other end is held with the PWM of DSP digital coordination control module and is connected;
Described measure voltage & current module one end is connected with arc load, and the other end is connected with the A/D input of DSP digital coordination control module;
Described human-computer interface module and DSP digital coordination control module are interconnected.
The built-in eCAN module of described DSP digitization system control module realizes main frame and controls from the digital coordination between machine, thus realizes synchronous, alternately and random three kinds of low frequency modulations type dipulse phase outputs.
Described DSP digital coordination control module is specially TMS320F28335.
The ePWM output module of the built-in generation pwm signal of described DSP digital coordination control module.
Described DSP digital coordination control module is realized synchronously by PWM waveform modulated, is replaced and random three kinds of low frequency modulations type dipulses, and low frequency modulations type dipulse comprises flash group and weak impulse train.
The two-way dipulse electric current of described locking phase low frequency modulations type dipulse arrives peaking simultaneously; The two-way dipulse current waveform of alternating phase low frequency modulations type dipulse differs 180 °; The two-way dipulse electric current of random phase low frequency modulations type dipulse is different to the time of peaking.
Carry out periodicity by low-frequency pulse to the peak point current of high-frequency impulse and burst length to switch, obtain the strong and weak impulse train of periodically variable two-way, the rigidity of twin arc is improved by low frequency modulations type dipulse, twin arc acts on molten bath and strengthens melting bath stirring, reduce the occurrence probability of gas hole defect, reduce thermal output, refinement weld metal zone and heat affected area crystal grain.
Mariages molten drop is transitioned into molten bath with the form of project transfer under the effect of low frequency modulations type dipulse, molten drop carries a large amount of heat energy and kinetic energy impact molten bath, intense impact effect is produced to molten bath, thus stirring action is produced to molten bath, reach the occurrence probability reducing gas hole defect, reduce thermal output, the effect of refinement weld metal zone and heat affected area crystal grain.
Described low frequency modulations type dipulse frequency is low, the frequency that its frequency is welded well below traditional pulse MIG, and the frequency of molten bath itself vibrates is also very low, the frequency of DSP digital coordination control module modulation low frequency modulations type dipulse, make the intrinsic frequency range of its frequency range and molten bath self close, make molten bath produce resonance, and promote the raising of joint performance further.
Beneficial effect of the present invention:
(1) welding efficiency is high.Traditional double wire bond compares monofilament weldering efficiency larger lifting already, high-power mariages pulse MIC welding due to the molten drop amount adopting thick welding wire (diameter more than 1.6) and produce under big current (monofilament more than peak point current 630A) heat effect large, molten bath is wide and dark, the groove of large slab weldment can be filled up very soon, high-power twin arc burns jointly on a molten bath, total heat input inputs much larger than the mariages welding heat of traditional monofilament electric current at below 630A, be easy to realize one-shot forming welding, and traditional double wire bond often needs several to tens roads, layer weld seam just can fill up large thick plates groove, therefore speed of welding and deposition efficiency can greatly be improved.
(2) greatly reduce high-power twin arc mutually to disturb.High-power mariages pulse MIC welding is due to close together between mariages, if the electric current rule in conventional Double Wire Welding is applied to big current double wire welding, namely the two-way pulse current of Double Wire Welding is just increased merely, so the magnetic field that produces of electric current is by corresponding increase, twin arc interaction force is increased, cause serious twin arc interference, disturbed condition increases with power and increases further, the intermittent current interruption of twin arc occurs often, cause welding process unstable, the high efficiency welding process that cannot realize ideal, welding effect is poorer than conventional below 630A mariages pulse MIC welding, even poorer than single arc welding, the advantage of mariages high power welding cannot be embodied.The present invention regulates field intensity and the distribution situation of twin arc current field by two kinds of pulse reciprocations of low frequency modulations type dipulse, optimizes the interaction situation of the electromagnetic force between high-power twin arc, reduces high-power twin arc and mutually disturb.
(3) welding quality is high.The heat input of high-power mariages pulse MIC welding to material is large, therefore causes weld metal zone and heat affected area coarse grains, seriously reduces the toughness of material, need to heat-treat after some structure weldings, make it apply and be restricted.The present invention acts on high-power mariages pulse MIC welding process by low frequency modulations type dipulse, by changing the output phase relation of mariages, strengthen melting bath stirring, reduce the occurrence probability of gas hole defect, reduce thermal output simultaneously, refinement weld metal zone and heat affected area crystal grain, obtain scalelike mark weld seam attractive in appearance, thus improve welding process stability, optimize welding line tissue and improve quality of weld seam molding.
Accompanying drawing explanation
Fig. 1 is overall structure block diagram of the present invention.
Fig. 2 (a) ~ Fig. 2 (b) is the high-frequency impulse of low frequency modulations type dipulse of the present invention and the waveform parameter schematic diagram of low-frequency pulse respectively.
Fig. 3 (a) ~ Fig. 3 (c) is of the present invention synchronous, alternately and random three kinds of phase pattern low frequency modulations type dipulse waveform schematic diagrames respectively.
Fig. 4 (a) and Fig. 4 (b) is high-frequency direct-current square-wave current waveform and the medium and low frequency Square wave pulses current waveform generation schematic diagram of low frequency modulations type dipulse waveform of the present invention respectively.
Fig. 5 is the structured flowchart of DSP digital coordination control module of the present invention.
Fig. 6 (a) ~ Fig. 6 (c) is main frame low frequency modulations type dipulse generating routine flow chart of the present invention respectively, from machine low frequency modulations type dipulse generating routine flow chart and T0 timer interrupt service program flow diagram.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
As shown in Figure 1, a kind of high-power mariages pulse MIC welding low frequency modulations type dipulse control system, comprises the identical host power supply of structure and from electromechanical source, host power supply and being connected by CAN between electromechanical source.Host power supply is responsible for front silk and provides electric current and Collaborative Control whole system, is responsible for rear silk provides electric current from electromechanical source, not electrical connection between two root wires; On software, from the control of electromechanical source Receiving Host power supply, by CAN communication handshake data between slave power supply.
Connect as follows: described host power supply and include two main circuits and control circuit from electromechanical source, described two main circuit one end are connected with three-phase alternating current, and after other end parallel connection, acting in conjunction is in arc load, and described main circuit comprises power conversion modules 101;
Described control circuit comprises human-computer interface module 104, DSP digital coordination control module 105, high-frequency drive module 102 and measure voltage & current module 103;
One end of described high-frequency drive module 102 is connected with one end of power conversion modules 101, and the other end is held with the PWM of DSP digital coordination control module 105 and is connected;
Described measure voltage & current module 103 one end is connected with arc load, and the other end is connected with the A/D input of DSP digital coordination control module 105; The number of described measure voltage & current module is identical with main circuit number, and the present embodiment measure voltage & current module adopts voltage-current sensor to detect load voltage electric current.
Described human-computer interface module 104 is interconnected with DSP digital coordination control module 105, main frame and input given welding parameter parameters such as () pulse frequency, pulse duty factor, peak point current, background current, peak value arc voltage, wires feed rate respectively by respective man-machine interface from electromechanical source, the arc voltage of feedback and welding current are by main frame and the liquid crystal display display from the respective man-machine interface of machine.
The TMS320F28335 of what described DSP digital coordination control module core processor adopted is TI company.
The built-in eCAN module of described DSP digital coordination control module realizes main frame and controls from the digital coordination between machine, thus realizes synchronous, alternately and random three kinds of low frequency modulations type dipulse phase outputs.
Operation principle of the present invention: the predetermined output low frequency modulation type dipulse size of current being inputted two root wires by man-machine interface, DSP passes through measure voltage & current module acquires to arc voltage and welding current signal simultaneously, DSP program by the given arc voltage of man-machine interface and welding current signal with from measure voltage & current module acquires to two-way arc voltage compare with welding current signal, the ePWM that a control signal acts on DSP is produced through closed loop control algorithm, by the IGBT break-make that dynamically changes PWM dutycycle to control two main circuits to keep the stable of output voltage or electric current.Known based on this principle, by changing the dutycycle of pulse current, output current can be allowed to become and to diminish greatly, forming the low-frequency d pulse current of 1 ~ 200Hz.
The present invention constantly changes the dutycycle of pwm signal according to coherent pulse parameter by DSP program, thus change the dutycycle of IGBT switching signal, and then changes the output current of power supply, forms one high and one low pulse current.The principle that realizes of total impulse waveform is achieve pulse width modulation to 20kHz carrier waveform with DSP internal processes, and filter inductance then achieves the demodulation to modulation waveform, is finally met the low frequency modulations type dipulse electric current needed for welding procedure.For reducing the impact of twin arc intermolecular forces welding quality, by the phase duty pattern of CAN communication adjustment slave power supply between slave power supply.The course of work of digital coordination control system is as follows: main frame and input given low frequency modulations type double-pulse parameters (pulse one background current I respectively by respective man-machine interface from machine
b1, peak point current I
p1, background current time T
b1with peak current time T
p1; Pulse two background current I
b2, peak point current I
p2, background current time T
b2with peak current time T
p2; Pulse one current time T
1with pulse two current time T
2ten parameters altogether).System Working Principle is: after system initialization, acquiescence enters holding state, while responding coherent signal in the standby state, scanning judges arc welding gun switch, when arc welding gun switch closes, main frame sends welding commencing signal to from machine, then mainframe program enters striking control, continuous cycle criterion size of current simultaneously, when electric current reaches certain threshold value, program then enter normal welding procedure, now wire feed rate is accelerated, program cycle judges input parameter, the impulse waveform realizing output current according to parameter switches, meanwhile, the state of continuous cycle detection arc welding gun switch while of program, once arc welding gun switch disconnects, program proceeds to the receipts arc stage after sending off signal from machine, after receipts arc completes, program enters holding state, system completes a welding process, in this case simultaneously, system constantly detects arc welding gun switch, once detect that arc welding gun switch closes, then start new round welding process.Then constantly scan the welding commencing signal that main frame sends over after entering holding state from machine, once main frame starting-up signal be detected, then enter the identical program cycle pattern with main frame, until receive main frame off signal, again enter standby program.The present invention acts on high-power mariages pulse MIC welding process by low frequency modulations type dipulse, improve the interaction force between high-power twin arc, reduce high-power twin arc mutually to disturb, strengthen melting bath stirring, reduce the occurrence probability of gas hole defect, reduce thermal output, refinement weld metal zone and heat affected area crystal grain, obtain scalelike mark weld seam attractive in appearance, thus improve welding process stability, optimize welding line tissue and improve quality of weld seam molding.
The high-frequency impulse of low frequency modulations type dipulse of the present invention and the waveform parameter schematic diagram of low-frequency pulse is respectively as shown in Fig. 2 (a) and Fig. 2 (b).Low frequency modulations type dipulse comprises flash group and weak impulse train, flash and weak impulse waveform and single impulse welding waveform similar, frequency is higher, is called high-frequency impulse; Meanwhile, flash group and weak impulse train, respectively as the peak value of large impulse waveform and base value, overallly form the lower macroscopical pulse of frequency, are called low-frequency pulse.From Fig. 2 (a) and Fig. 2 (b), low frequency modulations type dipulse has 10 parameters can supply to regulate, and they are: pulse one (weak pulse punching) background current I
b1, peak point current I
p1, background current time T
b1with peak current time T
p1; Pulse two (flash) background current I
b2, peak point current I
p2, background current time T
b2with peak current time T
p2; Pulse one current time T
1with pulse two current time T
2.
As shown in Fig. 3 (a), Fig. 3 (b) and Fig. 3 (c), be respectively of the present invention synchronous, alternately and random three kinds of phase pattern low frequency modulation type dipulse waveform schematic diagrames.Locking phase two-way low frequency modulations type dipulse electric current reaches maximum simultaneously, is conducive to forming larger fusion penetration; Alternating phase two-way low frequency modulations type dipulse current waveform differs 180 °, significantly can reduce high-power twin arc and mutually disturb; Random phase two-way low frequency modulations type dipulse electric current is different to the time of peaking, significantly can reduce high-power twin arc and mutually disturb, can realize larger fusion penetration again.
As shown in Fig. 4 (a) and Fig. 4 (b), be respectively low frequency modulations type dipulse waveform of the present invention high-frequency direct-current square-wave current waveform and medium and low frequency Square wave pulses current waveform produce schematic diagram.The basic functional principle that low frequency modulations type dipulse waveform produces is: three-phase alternating current becomes after direct current through rectification and enters the high-frequency ac square wave current that inverter is reverse into 20kHz, then by becoming high-frequency direct-current square wave current after Transformer Rectifier, this high-frequency direct-current square wave current is finally converted into medium and low frequency Square wave pulses electric current after inductor filter.Must in addition it is emphasised that, the size of output current is relevant with dutycycle, and dutycycle is larger, and electric current is larger; Dutycycle is less, and electric current is less.Therefore, change dutycycle size and can change output current size.Known based on this principle, by changing the dutycycle of pulse current, output current can be allowed to become and to diminish greatly, forming the medium and low frequency Square wave pulses electric current of 1 ~ 200Hz.In fact, DSP program constantly changes the dutycycle of pwm signal according to coherent pulse parameter just, thus changes IGBT switching signal dutycycle, and then changes the output current of power supply, forms one high and one low medium and low frequency Square wave pulses electric current.The principle that realizes of total impulse waveform is achieve pulse width modulation to 20kHz high frequency carrier waveform with DSP internal processes, and filter inductance then achieves the demodulation to modulation waveform, is finally met the low frequency modulations type dipulse waveform needed for welding procedure.
Be illustrated in figure 5 the structured flowchart of DSP digital coordination control module of the present invention.Dsp chip is embedded with ePWM output module, meets the requirement that multi-channel PWM exports; Dead Time is arranged by software programming; Communicated with host computer by SCI communication interface, display related data and acquisition relevant parameter; Each self-contained A/D module can gather the information come through measure voltage & current module samples; FLASH can store a series of welding parameter pre-set, composition welding cell.High-power mariages pulse MIC welding main frame and being exchanged by the CAN between two pieces of dsp chips from the weld information between machine.
It is main frame of the present invention and from machine low frequency modulations type dipulse generating routine flow chart as shown in Fig. 6 (a) ~ Fig. 6 (c).Fig. 6 (a) is main frame low frequency modulations type dipulse generating routine flow chart, and Fig. 6 (b) is that Fig. 6 (c) is T0 timer interrupt service program flow diagram from machine low frequency modulations type dipulse generating routine flow chart.Low frequency modulations type double PMIG welding welding wave parameter comprises pulse one background current I
b1, peak point current I
p1, background current time T
b1with peak current time T
p1; Pulse two background current I
b2, peak point current I
p2, background current time T
b2with peak current time T
p2; Pulse one current time T
1with pulse two current time T
210 parameters altogether.Main frame low frequency modulations type dipulse produces the switching realizing low frequency modulations type dipulse mainly through timer T0 and T1.Be subject to host computer control from the course of work of machine, waveform switch is also the switching that the Collaborative Control signal sended over according to main frame realizes impulse waveform peak value and base value.The Collaborative Control signal that main frame sends over contains the state in each stage of pulse, then constantly scans Collaborative Control signal from machine, and realizes pulse output according to the mark of each stage pulse.During alternating phase mode of operation, compared to pulse welding, the timer 0 interrupt service routine more complicated of low frequency modulations type dipulse welding.10 parameters of the waveform of low frequency modulations type dipulse welding, all given by control panel, use for ease of program, these parameters will carry out conversion to a certain degree in pulse parameter counting subroutine.Such as, the cycle of the large pulse that control panel is given is made up of pulse one and pulse two and dutycycle.Cycle and dutycycle are directly changed into the number of pulse one and pulse two by the present invention, and like this, program implements than being easier to.
Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not limited by the examples; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (9)
1. a high-power mariages pulse MIC welding low frequency modulations type dipulse control system, comprise for front silk electric current is provided and the host power supply of Collaborative Control whole system and for rear silk provide electric current from electromechanical source, it is characterized in that, described main frame is connected by CAN with from electromechanical source;
Described host power supply and include two main circuits and control circuit from electromechanical source, described two main circuit one end are connected with three-phase alternating current, and be connected with arc load after other end parallel connection, described main circuit comprises power conversion modules;
Described control circuit comprises human-computer interface module, DSP digital coordination control module, high-frequency drive module and measure voltage & current module;
Described one end of high-frequency drive module is connected with one end of power conversion modules, and the other end is held with the PWM of DSP digital coordination control module and is connected;
Described measure voltage & current module one end is connected with arc load, and the other end is connected with the A/D input of DSP digital coordination control module;
Described human-computer interface module and DSP digital coordination control module are interconnected.
2. control system according to claim 1, it is characterized in that, the built-in eCAN module of described DSP digital coordination control module realizes main frame and controls from the digital coordination between machine, thus realizes synchronous, alternately and random three kinds of low frequency modulations type dipulse phase outputs.
3. control system according to claim 2, is characterized in that, described DSP digital coordination control module is specially TMS320F28335.
4. control system according to claim 1, is characterized in that, the ePWM output module of the built-in generation pwm signal of described DSP digital coordination control module.
5. control system according to claim 1, it is characterized in that, described DSP digital coordination control module is realized synchronously by PWM waveform modulated, is replaced and random three kinds of low frequency modulations type dipulses, and low frequency modulations type dipulse comprises flash group and weak impulse train.
6. control system according to claim 2, is characterized in that, the two-way dipulse electric current of described locking phase low frequency modulations type dipulse arrives peaking simultaneously; The two-way dipulse current waveform of alternating phase low frequency modulations type dipulse differs 180 °; The two-way dipulse electric current of random phase low frequency modulations type dipulse is different to the time of peaking.
7. control system according to claim 1, it is characterized in that, carry out periodicity by low-frequency pulse to the peak point current of high-frequency impulse and burst length to switch, obtain the strong and weak impulse train of periodically variable two-way, high-power twin arc acts on weld pool surface with rigidity electric arc under the strong and weak impulse train effect of periodically variable two-way, produces stirring action to molten bath.
8. control system according to claim 1, it is characterized in that, mariages molten drop is transitioned into molten bath with the form of project transfer under the effect of low frequency modulations type dipulse, molten drop carries a large amount of heat energy and kinetic energy impact molten bath, intense impact effect is produced to molten bath, thus stirring action is produced to molten bath.
9. control system according to claim 3, is characterized in that, the frequency of DSP digital coordination control module modulation low frequency modulations type dipulse, the frequency range making its frequency range and molten bath self intrinsic is close, molten bath is produced and resonates.
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| CN113369640A (en) * | 2021-06-11 | 2021-09-10 | 华南理工大学 | Control method for stirring and balanced oscillation of deep-melting K-TIG welding pool |
| CN114769815A (en) * | 2022-06-06 | 2022-07-22 | 唐山松下产业机器有限公司 | Twin-wire welding method and apparatus |
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| CN106112211A (en) * | 2016-07-05 | 2016-11-16 | 唐山松下产业机器有限公司 | Many welding machines cooperative control device, method and welding system |
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| CN107363375B (en) * | 2016-11-09 | 2020-06-02 | 广东技术师范大学 | Multi-frequency modulation wave control method for high-speed double-wire robot welding |
| CN108746944A (en) * | 2018-07-18 | 2018-11-06 | 华南理工大学 | The adjustable high-power mariages synergic-pulsed MIG welding power-supply system of low-and high-frequency impulse phase and its control method |
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| CN108994465A (en) * | 2018-08-23 | 2018-12-14 | 广东省焊接技术研究所（广东省中乌研究院） | A kind of plasma-arc hybrid welding method of pulse current modulation |
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| CN111975178B (en) * | 2020-07-17 | 2024-03-26 | 华南理工大学 | Molten pool balance oscillation pulse deep-melting locking hole TIG welding system and welding method thereof |
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| CN113102869A (en) * | 2021-03-26 | 2021-07-13 | 华南理工大学 | Particle swarm optimization-based double-wire MIG welding additive manufacturing system and method |
| CN113369640A (en) * | 2021-06-11 | 2021-09-10 | 华南理工大学 | Control method for stirring and balanced oscillation of deep-melting K-TIG welding pool |
| CN113369640B (en) * | 2021-06-11 | 2022-08-16 | 华南理工大学 | Method for controlling stirring and balanced oscillation of deep-melting K-TIG welding pool |
| CN114951909A (en) * | 2022-05-11 | 2022-08-30 | 华南理工大学 | Integrated double-wire variable-polarity double-pulse MIG welding power supply system and control method |
| CN114951909B (en) * | 2022-05-11 | 2023-12-22 | 华南理工大学 | Integrated double-wire polarity-changing double-pulse MIG welding power supply system and control method |
| CN114769815A (en) * | 2022-06-06 | 2022-07-22 | 唐山松下产业机器有限公司 | Twin-wire welding method and apparatus |
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