CN103071894B - Metal-transfer gas-shielded welding control system and control method thereof - Google Patents
Metal-transfer gas-shielded welding control system and control method thereof Download PDFInfo
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- CN103071894B CN103071894B CN201310007756.4A CN201310007756A CN103071894B CN 103071894 B CN103071894 B CN 103071894B CN 201310007756 A CN201310007756 A CN 201310007756A CN 103071894 B CN103071894 B CN 103071894B
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Abstract
The invention discloses a metal-transfer gas-shielded welding control system and a control method thereof. The control system comprises a gas-shielded welding gun, a wire feeding control system for providing a metal welding wire to the gas-shielded welding gun and a welding power supply for controlling the fusion of the metal welding wire to generate welding arcs and also comprises a current collecting and amplifying circuit, a voltage sampling and amplifying circuit, an arc short-circuit detecting circuit, an arc necking pre-detection circuit, a metal-transfer waveform control system, an arc voltage-current distributing unit system, an arc current regulating unit and an arc voltage regulating unit; and according to the metal-transfer gas-shielded welding control system and the control method thereof, the change of the states of arcing and short-circuiting during metal transfer can be accurately detected, and the contraction state of a welding droplet liquid bridge is accurately and reliably judged in advance, so that the fully digitized control of the process of globular transfer of the welding arcs is realized, and the aim of accurately controlling arcing energy and weld penetration is achieved.
Description
Technical field
ART) and control method the present invention relates to a kind of metal transfer gas shielded welding, (be called for short:, the electric arc being applicable to secondary chopped mode Arc Welding Power or contravariant power controls specifically to relate to a kind of metal transfer gas shielded arc welding connected control system.
Background technology
Welding equipment producer both domestic and external is for improving welding quality; carry out effort always; conventional metals transition gas-shield welding method is: the source of welding current output loop of constant voltage external characteristics is connected the moderate current-limiting reactor of an inductance value; during arc short circuit; due to the existence of inductance; the short circuit peak when climbing of short circuit current and the fracture of liquid bridge is all suppressed, thus controls metal transfer process.But the selection of inductance value size is wanted suitably, too little inductance causes the climbing of electric current and the quick-fried power-off of liquid bridge to flow through greatly, produce a large amount of gas to spatter, too large inductance, while suppression the increasing rate of short circuit current and peak point current, can make short circuit duration increase, liquid bridge is made to have little time to shrink and transition, cause solid short circuit to occur, affect normally carrying out of welding process, in addition, because different welding conditions are different to the requirement of inductance, therefore the method is difficult to the requirement meeting welding procedure.
Also the method adopting welding current waveform to control to coordinate electronic inductor is had, the method according to electric arc each stage to the requirement of current waveform, design a series of current waveform based on time devided modulation, controlled the rate of change of each stage electric current of metal drop transition by electronic inductor.But each class relationship of actual metal graded seal is complicated, and is subject to the random disturbances of other condition of welding process, and electric current is difficult to synchronously consistent with each stage of electric arc, and therefore actual application limitation is large, is not easy to realize controlling functions.
Also the method adopting and detect short-circuit process and electric arc is controlled in real time is had, the method is by carrying out detection and control to electric arc and short-circuit process, there is following problem: (1) molten drop short circuit liquid bridge resistance is very little, but be subject to the impact of various factors, be difficult to be detected accurately.(2) short circuit liquid bridge contraction process accelerates, therefore at detection fluid bridge by time disrumpent feelings, then control the output current of the source of welding current, its response is likely delayed, affects the control of welding process.
Also the method adopting composite power source external characteristics to control is had, the method is to the arcing in welding arc, transcient short circuit time, the constriction of liquid bridge and disrumpent feelings and each stage of arc reignition, carry out closed-loop control, the external characteristics of power supply, has following feature: (1), when molten drop and molten bath are short-circuited, power supply exports a very little electric current, allow molten drop sprawl at weld pool surface, prevent the generation that instantaneous short circuit is splashed.(2) when molten drop is sprawled at weld pool surface, after forming stable liquid bridge, electric current rises to suitable short circuit peak with larger growth rate, and short circuit liquid bridge is shunk under this electric current, forms necking down.(3) in the later stage of short circuit liquid bridge contraction, both the disrumpent feelings eve, short circuit current had reduced rapidly, and liquid bridge is disrumpent feelings under small area analysis, was formed without splashing molten drop.(4) disrumpent feelings at liquid bridge, while electric arc ignites again, power supply can export fusion penetration in a period of time immediately and control external characteristics, generate a stronger arcing pulse current, increase arcing energy and weld penetration, the action time that this fusion penetration controls external characteristics can carry out adjustment and preset, to make to obtain different fusion penetrations under identical wire feed rate according to the requirement of fusion penetration.(5) after arcing pulse, electric arc can carry out arc length detection and control state automatically, controls arc length and molten drop size.Use this control method, fusion penetration significantly increases, and appearance of weld is good, has good welding procedure effect, but how correctly to detect welding output liquid bridge diameter and contraction state, controls the droplet transfer, is a welding machine industry difficult problem to be solved always.Also be the core place controlled the droplet transfer.
Summary of the invention
In order to solve the problems of the technologies described above; the present invention proposes a kind of metal transfer gas shielded arc welding connected control system and control method; the change of arcing, short-circuit condition when accurately can detect metal transfer; accurately reliably the contraction state of Welding Molten Drop liquid bridge is judged in advance; thus realize the full-digital control of welding arc droplet transfer process, reach the object accurately controlling arcing energy and weld penetration.
Technical scheme of the present invention is achieved in that
A kind of metal transfer gas shielded arc welding connected control system, comprise gas protective welding gun, the wire feed control system of metal welding wire is provided for described gas protective welding gun and controls the source of welding current that metal welding wire welding produces welding arc, also comprise current acquisition amplifying circuit, voltage sampling amplifying circuit, arc short circuit testing circuit, electric arc necking down preliminary examination circuit, metal transfer Waveform Control system, arc voltage current distribution unit system, arc current regulon and arc voltage adjustment unit; Described current acquisition amplifying circuit can gather the current signal of welding arc by welding arc current sensor, and exports welding arc current detection signal to described metal transfer Waveform Control system and described arc current regulon; Described voltage sampling amplifying circuit can gather the voltage signal of welding arc, generates and exports arc voltage detection signal to described arc short circuit testing circuit, described electric arc necking down preliminary examination circuit and described arc voltage adjustment unit; Described arc short circuit testing circuit can receive described arc voltage detection signal, generates and exports conditions at the arc detection signal to described metal transfer Waveform Control system; Described electric arc necking down preliminary examination circuit can receive described arc voltage detection signal, generates and exports electric arc necking down control signal to described metal transfer Waveform Control system; Separately be provided with welding arc parameters unit, for providing welding arc parameter signal for described metal transfer Waveform Control system; Described metal transfer Waveform Control system can receive described conditions at the arc detection signal, electric arc necking down control signal, welding arc current detection signal and welding arc parameter signal, generates and export metal transfer can control waveform signal to described arc voltage current distribution unit system; Described arc voltage current distribution unit system can receive described metal transfer and can control waveform signal, generate and export welding arc voltage current time sequential distributing signal, and generate and export welding arc voltage current waveform signal to described arc current regulon and arc voltage adjustment unit; Described arc current regulon can receive described welding arc current detection signal and described welding arc voltage current waveform signal, generates and exports welding arc current controling signal; Described arc voltage adjustment unit can receive described arc voltage detection signal and described welding arc voltage current waveform signal, generates and exports welding arc voltage control signal; Separately be provided with fast digital switch, described welding arc voltage current time sequential distributing signal by the selection of welding arc current controling signal described in described fast digital switch control rule and described welding arc voltage control signal, and drives the described source of welding current to produce the welding arc that can control metal transfer.
As a further improvement on the present invention, described arc short circuit testing circuit is high speed signal comparison circuit, described metal transfer Waveform Control system exports preset arc short circuit threshold signal to described arc short circuit testing circuit, described arc short circuit testing circuit receives described arc voltage detection signal and described arc short circuit threshold signal, generates and exports conditions at the arc detection signal to described metal transfer Waveform Control system.
As a further improvement on the present invention, described metal transfer Waveform Control system comprises digital filtering treatment system and arc control system, described digital filtering treatment system receives described conditions at the arc detection signal and after carrying out digital filtering process, exports to described arc control system.
As a further improvement on the present invention, described metal transfer Waveform Control system comprises synchronized-pulse control unit, and described electric arc necking down preliminary examination circuit comprises arc parameters memory circuit, digital delay unit, parameters memorizing unit, intermediate parameters mnemon and compares amplifying unit at a high speed; Described synchronized-pulse control unit can generation time editing pulse signal, and exports to described digital delay unit, described parameters memorizing unit and described arc parameters memory circuit; Described arc parameters memory circuit can receive described time division pulse signal and described arc voltage detection signal, generates and exports the first arc parameters signal to described intermediate parameters mnemon; Described digital delay unit can receive described time division pulse signal and generate time delay synchronization pulse; Described intermediate parameters mnemon can receive described time delay synchronization pulse and described first arc parameters signal, generates and export the second arc parameters signal to compare amplifying unit and parameters memorizing unit to described high speed; Described parameters memorizing unit can receive described time division pulse signal and described second arc parameters signal, generates and export the 3rd arc parameters signal to compare amplifying unit to described high speed; Described high speed compares amplifying unit can receive described second arc parameters signal and described 3rd arc parameters signal, generates and exports electric arc necking down control signal.
A control method for metal transfer gas shielded arc welding connected control system, comprises and welds state of a control as follows:
State 1., according to conditions at the arc detection signal, metal transfer Waveform Control system judges whether electric arc there occurs short circuit, after judging that short circuit occurs, metal transfer Waveform Control system reduces the electric current of the source of welding current until reach the first default setting value by arc voltage current distribution unit system, current regulation unit and voltage regulation unit, and after maintaining one section of default first setting-up time, get the hang of 2.;
State 2., metal transfer Waveform Control system controls the electric current of the source of welding current by arc voltage current distribution unit system, current regulation unit and voltage regulation unit increases with the first rate of change, until after reaching default the second setting value, get the hang of 3.;
State 3., metal transfer Waveform Control system controls the electric current of the source of welding current by arc voltage current distribution unit system, current regulation unit and voltage regulation unit increases with the second rate of change, second rate of change is less than the first rate of change, until electric arc necking down preliminary examination circuit judges that 4. Welding Molten Drop liquid bridge is by after separation, get the hang of;
State 4., metal transfer Waveform Control system reduces the electric current of the source of welding current until default the first setting value by arc voltage current distribution unit system, current regulation unit and voltage regulation unit, and after maintaining one section of default second setting-up time, get the hang of 5.;
State 5., metal transfer Waveform Control system controls the electric current of the source of welding current by arc voltage current distribution unit system, current regulation unit and voltage regulation unit increases with the 3rd rate of change, 3rd rate of change is greater than the first rate of change, until reach the 3rd default setting value, and after maintaining one section of default the 3rd setting-up time, electric current with the 4th rate of change decline until preset the 4th setting value after, get the hang of 6.;
State 6., metal transfer Waveform Control system controls after the electric current of the source of welding current maintains one section of default the 4th setting-up time by arc voltage current distribution unit system, current regulation unit and voltage regulation unit, with the 5th rate of change decline until after the 5th setting value preset, get the hang of 7.;
State 7., metal transfer Waveform Control system passes through the electric current maintenance of arc voltage current distribution unit system, current regulation unit and the voltage regulation unit control source of welding current until arc short circuit generation is next time detected, gets the hang of 1..
The invention has the beneficial effects as follows: the invention provides a kind of metal transfer gas shielded arc welding connected control system and control method thereof, arcing when achieving metal transfer by arc short circuit testing circuit, the accurate detection of the change of short-circuit condition, judged in advance by the contraction state of electric arc necking down preliminary examination circuit to Welding Molten Drop liquid bridge, accurately can detect the generation point of short circuit liquid bridge reliably, by metal drop transient process is refined as seven kinds of state of a controls, control respectively, realize the full-digital control of welding arc droplet transfer process, reach the object accurately controlling arcing energy and weld penetration.
Accompanying drawing explanation
Fig. 1 is metal transfer gas shielded arc welding connected control system theory structure schematic diagram of the present invention;
Fig. 2 is arc short circuit testing circuit schematic diagram of the present invention;
Fig. 3 is digital filtering handling principle figure of the present invention;
Fig. 4 is electric arc necking down preliminary examination circuit theory diagrams of the present invention;
Fig. 5 is metal transfer gas shielded welding state of a control oscillogram of the present invention.
By reference to the accompanying drawings, make the following instructions:
300---arc short circuit testing circuit 301---arc voltage detection signal
302---arc short circuit threshold signal 303---high speed signal comparison circuit
304---conditions at the arc detection signal 401---digital filtering treatment system
402---arc control system 501---time division pulse signal
600---electric arc necking down preliminary examination circuit 601---synchronized-pulse control unit
602---digital delay unit 603---parameters memorizing unit
604---arc parameters memory circuit 605---intermediate parameters mnemon
606---comparing amplifying unit 607 at a high speed---electric arc necking down control signal
608---second arc parameters signal 609---the 3rd arc parameters signal
610---time delay synchronization pulse 611---the first arc parameters signal
701---source of welding current 702---gas protective welding gun
703---wire feed control system 704---arc current sensor
705---current acquisition amplifying circuit 706---voltage sampling amplifying circuit
707---metal transfer Waveform Control system
708---arc voltage current distribution unit system
709---metal transfer can control waveform signal
710---welding arc current detection signal
711---arc current regulon
712---welding arc voltage current waveform signal
713---welding arc voltage current time sequential distributing signal
714---arc voltage adjustment unit
715---welding arc parameters unit
716---welding arc voltage control signal
717---welding arc current controling signal
718---fast digital switch
719---welding arc parameter signal
Detailed description of the invention
As shown in Figure 1, a kind of metal transfer gas shielded arc welding connected control system (is called for short: ART), comprise gas protective welding gun 702, there is provided the wire feed control system 703 of metal welding wire for described gas protective welding gun and control the source of welding current 701 that metal welding wire welding produces welding arc, it is characterized in that: also comprise current acquisition amplifying circuit 705, voltage sampling amplifying circuit 706, arc short circuit testing circuit 300, electric arc necking down preliminary examination circuit 600, metal transfer Waveform Control system 707, arc voltage current distribution unit system 708, arc current regulon 711 and arc voltage adjustment unit 714, described current acquisition amplifying circuit can gather the current signal of welding arc by welding arc current sensor 704, and exports welding arc current detection signal 710 to described metal transfer Waveform Control system and described arc current regulon, described voltage sampling amplifying circuit can gather the voltage signal of welding arc, generates and exports arc voltage detection signal 301 to described arc short circuit testing circuit, described electric arc necking down preliminary examination circuit and described arc voltage adjustment unit, described arc short circuit testing circuit can receive described arc voltage detection signal, generates and exports conditions at the arc detection signal 304 to described metal transfer Waveform Control system, described electric arc necking down preliminary examination circuit can receive described arc voltage detection signal, generates and exports electric arc necking down control signal 607 to described metal transfer Waveform Control system, separately be provided with welding arc parameters unit 715, for providing welding arc parameter signal 719 for described metal transfer Waveform Control system, described metal transfer Waveform Control system can receive described conditions at the arc detection signal, electric arc necking down control signal, welding arc current detection signal and welding arc parameter signal, generates and export metal transfer can control waveform signal 709 to described arc voltage current distribution unit system, described arc voltage current distribution unit system can receive described metal transfer and can control waveform signal, generate and export welding arc voltage current time sequential distributing signal 713, and generate and export welding arc voltage current waveform signal 712 to described arc current regulon and arc voltage adjustment unit, described arc current regulon can receive described welding arc current detection signal and described welding arc voltage current waveform signal, generates and exports welding arc current controling signal 717, described arc voltage adjustment unit can receive described arc voltage detection signal and described welding arc voltage current waveform signal, generates and exports welding arc voltage control signal 716, separately be provided with fast digital switch 718, described welding arc voltage current time sequential distributing signal by the selection of welding arc current controling signal described in described fast digital switch control rule and described welding arc voltage control signal, and drives the described source of welding current to produce the welding arc that can control metal transfer.
Preferably, described arc short circuit testing circuit 300 is high speed signal comparison circuit 303, see Fig. 2, described metal transfer Waveform Control system exports preset arc short circuit threshold signal 302 to described arc short circuit testing circuit, described arc short circuit testing circuit receives described arc voltage detection signal 301 and described arc short circuit threshold signal, generates and exports conditions at the arc detection signal 304 to described metal transfer Waveform Control system.When short-circuit condition occurs, arc voltage can sharply decline, and therefore can determine whether to there occurs short circuit to the detection of arc voltage.When arc voltage detection signal amplitude is greater than arc short circuit threshold signal, the logical value exporting conditions at the arc detection signal is arc ignition state, otherwise conditions at the arc detection signal logical value is arc short circuit state.This arc short circuit testing circuit with metal transfer Waveform Control system export preset arc short circuit threshold signal for reference, can according to different welding procedures, regulate different arc short circuit threshold values, thus avoid the control misoperation that the interference of instantaneous short-circuit to control system causes.
Preferably, described metal transfer Waveform Control system comprises digital filtering treatment system 401 and arc control system 402, see Fig. 3, described digital filtering treatment system receives described conditions at the arc detection signal and after carrying out digital filtering process, exports to described arc control system (402).Like this, digital filtering process can be carried out to conditions at the arc detection signal by digital filtering treatment system, eliminate transient short-circuit to the de-stabilising effect of arc control system.
Preferably, as shown in Figure 4, described metal transfer Waveform Control system comprises synchronized-pulse control unit 601, and described electric arc necking down preliminary examination circuit 600 comprises arc parameters memory circuit 604, digital delay unit 602, parameters memorizing unit 603, intermediate parameters mnemon 605 and compares amplifying unit 606 at a high speed; Described synchronized-pulse control unit can generation time editing pulse signal 501, and exports to described digital delay unit, described parameters memorizing unit and described arc parameters memory circuit; Described arc parameters memory circuit 604 can receive described time division pulse signal 501 and described arc voltage detection signal 301, generates and exports the first arc parameters signal 611 to described intermediate parameters mnemon 605; Described digital delay unit 602 can receive described time division pulse signal 501 and generate time delay synchronization pulse 610; Described intermediate parameters mnemon 605 can receive described time delay synchronization pulse 610 and described first arc parameters signal 611, generates and export the second arc parameters signal 608 to compare amplifying unit 606 and parameters memorizing unit 603 to described high speed; Described parameters memorizing unit 603 can receive described time division pulse signal 501 and described second arc parameters signal 608, generates and export the 3rd arc parameters signal 609 to compare amplifying unit 606 to described high speed; Described high speed compares amplifying unit 606 can receive described second arc parameters signal 608 and described 3rd arc parameters signal 609, generates and exports electric arc necking down control signal 607.The control method of above-mentioned electric arc necking down preliminary examination circuit by splitting digit time, can judge the contraction state of Welding Molten Drop accurately in advance, the state erroneous judgement avoiding instantaneous short-circuit to cause.
Molten drop shrinks the later stage, and arc force and capillary positive feedback affect and make molten drop cross-sectional area accelerate to reduce, and liquid resistor bridge increases rapidly, therefore can use the resistance change rate dr/dt of liquid bridge, or the state value of liquid bridge is as the detection signal shrinking the moment.In actual circuit, owing to being difficult to the state value real dr/dt or liquid bridge being detected, therefore electric arc necking down preliminary examination circuit is by detecting dv/dt, judges molten drop liquid bridge contraction state, exports electric arc necking down control signal.
The present invention adopts dividing method digit time, detects the size of dv/dt signal, within the extremely short time, namely judges the difference of arc voltage, achieve the digital quantization of analog signal, be convenient to realize all-digitized demodulator.The method is simple and reliable, facilitates digital display circuit to control, the electric arc necking down control signal erroneous judgement simultaneously avoiding transient short-circuit in welding process to cause.Shown in electric arc necking down preliminary examination circuit theory Fig. 4 of the present invention, the synchronized-pulse control unit generation time editing pulse signal of metal transfer Waveform Control system, control different arc parameters mnemon, assuming that during the pulse of time division pulse signal, arc parameters memory circuit gathers arc voltage detection signal, if now the first arc parameters signal is vt1, time division pulse signal produces time delay synchronization pulse through digital delay unit, this time delay synchronization pulse controls intermediate parameters mnemon 605, now, it is vt1 that intermediate parameters mnemon exports the second arc parameters signal 608, second arc parameters signal is sent into and is compared amplifying unit 606 at a high speed, send into parameters memorizing unit 603 simultaneously, after the Δ t time, arc parameters memory circuit 604 gathers arc voltage 301, if now the first arc parameters signal is vt2, parameters memorizing unit 603 exports the 3rd arc parameters signal 609 is simultaneously vt1, time delay synchronization pulse 610 controls intermediate parameters mnemon 605 and exports the second arc parameters signal 608 for vt2, after having sampled, the sampled value of the second arc parameters signal 608 and the 3rd arc parameters signal 609 inputs to simultaneously and compares amplifying unit 606 at a high speed and compare, namely the electric arc necking down control signal 607 comparing at a high speed amplifying unit 606 output represents Va=k │ vt2-vt1 │, namely be equivalent to the rate of change of arc voltage in Δ t, the output logic that electric arc necking down control signal 607 controls current output waveform switches.
A control method for metal transfer gas shielded arc welding connected control system, as shown in Figure 5, comprises and welds state of a control as follows:
State 1., according to conditions at the arc detection signal, metal transfer Waveform Control system judges whether electric arc there occurs short circuit, after judging that short circuit occurs, metal transfer Waveform Control system reduces the electric current of the source of welding current until reach the first default setting value by arc voltage current distribution unit system, current regulation unit and voltage regulation unit, and after maintaining one section of default first setting-up time, get the hang of 2.; Like this, when molten drop and molten bath are short-circuited, the source of welding current exports a very little electric current, allows molten drop sprawl at weld pool surface, prevents the generation that instantaneous short circuit is splashed.
State 2., metal transfer Waveform Control system controls the electric current of the source of welding current by arc voltage current distribution unit system, current regulation unit and voltage regulation unit increases with the first rate of change, until after reaching default the second setting value, get the hang of 3.; When Welding Molten Drop is at welding pool surface spreading, after forming stable Welding Molten Drop liquid bridge, electric current rises to suitable short circuit peak with larger growth rate, and short circuit liquid bridge is shunk under this electric current, forms necking down.
State 3., metal transfer Waveform Control system controls the electric current of the source of welding current by arc voltage current distribution unit system, current regulation unit and voltage regulation unit increases with the second rate of change, second rate of change is less than the first rate of change, until electric arc necking down preliminary examination circuit judges that 4. Welding Molten Drop liquid bridge is by after separation, get the hang of; Like this, judged in advance, and electric arc necking down control signal is exported to metal transfer Waveform Control system by the contraction state of electric arc necking down preliminary examination circuit to Welding Molten Drop liquid bridge, correct testing point is the core that stable electric arc controls the droplet transfer.
State 4., metal transfer Waveform Control system reduces the electric current of the source of welding current until default the first setting value by arc voltage current distribution unit system, current regulation unit and voltage regulation unit, and after maintaining one section of default second setting-up time, get the hang of 5.; Like this, in the later stage that short circuit liquid bridge shrinks, the both disrumpent feelings eve, short circuit current reduces rapidly, and liquid bridge is disrumpent feelings under small area analysis, can effectively reduce the impact of welding arc sudden change to welding pool, prevent the excessive blast caused of arc energy from splashing, to maintain the stable of transition.
State 5., metal transfer Waveform Control system controls the electric current of the source of welding current by arc voltage current distribution unit system, current regulation unit and voltage regulation unit increases with the 3rd rate of change, 3rd rate of change is greater than the first rate of change, until reach the 3rd default setting value, and after maintaining one section of default the 3rd setting-up time, electric current with the 4th rate of change decline until preset the 4th setting value after, get the hang of 6.; Like this, can control arc energy, to reach larger fusion penetration; And control the shaping of the back side, prevent larger blow force of arc, the forward affecting liquid metal is sprawled.
State 6., metal transfer Waveform Control system controls after the electric current of the source of welding current maintains one section of default the 4th setting-up time by arc voltage current distribution unit system, current regulation unit and voltage regulation unit, with the 5th rate of change decline until after the 5th setting value preset, get the hang of 7.; Like this, accurately can control arc energy, control the molten wide of molten bath to reach, molten drop is sprawled under the effect of large arc current.
State 7., metal transfer Waveform Control system passes through the electric current maintenance of arc voltage current distribution unit system, current regulation unit and the voltage regulation unit control source of welding current until arc short circuit generation is next time detected, gets the hang of 1.; Like this, the stable of transition condition can be controlled, improve the degree of heat of weldment simultaneously, improve the shaping of weld seam.
In the present invention, metal transfer Waveform Control system realizes by DSP or MCU, the control method that the present invention adopts arc short circuit testing circuit and electric arc necking down preliminary examination circuit to combine, locked by inner logic in DSP or MCU, effectively avoid because the error status signal of instantaneous short-circuit generation is on the impact of control system, the droplet transfer is very steady.
Present invention employs Division Sampling method digit time, avoid the error of general-purpose simulation sample circuit condition adjudgement, practice shows that the accuracy of its state of a control anticipation is more than 97%.
Above embodiment is with reference to accompanying drawing; to a preferred embodiment of the present invention will be described in detail; those skilled in the art by carrying out amendment on various forms or change to above-described embodiment, but when not deviating from essence of the present invention, drops within protection scope of the present invention.
Claims (5)
1. a metal transfer gas shielded arc welding connected control system, comprise gas protective welding gun (702), there is provided the wire feed control system (703) of metal welding wire for described gas protective welding gun and control the source of welding current (701) that metal welding wire welding produces welding arc, it is characterized in that: also comprise current acquisition amplifying circuit (705), voltage sampling amplifying circuit (706), arc short circuit testing circuit (300), electric arc necking down preliminary examination circuit (600), metal transfer Waveform Control system (707), arc voltage current distribution unit system (708), arc current regulon (711) and arc voltage adjustment unit (714), described current acquisition amplifying circuit can gather the current signal of welding arc by welding arc current sensor (704), and exports welding arc current detection signal (710) to described metal transfer Waveform Control system and described arc current regulon, described voltage sampling amplifying circuit can gather the voltage signal of welding arc, generates and exports arc voltage detection signal (301) to described arc short circuit testing circuit, described electric arc necking down preliminary examination circuit and described arc voltage adjustment unit, described arc short circuit testing circuit can receive described arc voltage detection signal, generates and exports conditions at the arc detection signal (304) to described metal transfer Waveform Control system, described electric arc necking down preliminary examination circuit can receive described arc voltage detection signal, generates and exports electric arc necking down control signal (607) to described metal transfer Waveform Control system, separately be provided with welding arc parameters unit (715), for providing welding arc parameter signal (719) for described metal transfer Waveform Control system, described metal transfer Waveform Control system can receive described conditions at the arc detection signal, electric arc necking down control signal, welding arc current detection signal and welding arc parameter signal, generates and export metal transfer can control waveform signal (709) to described arc voltage current distribution unit system, described arc voltage current distribution unit system can receive described metal transfer and can control waveform signal, generate and export welding arc voltage current time sequential distributing signal (713), and generate and export welding arc voltage current waveform signal (712) to described arc current regulon and arc voltage adjustment unit, described arc current regulon can receive described welding arc current detection signal and described welding arc voltage current waveform signal, generates and exports welding arc current controling signal (717), described arc voltage adjustment unit can receive described arc voltage detection signal and described welding arc voltage current waveform signal, generates and exports welding arc voltage control signal (716), separately be provided with fast digital switch (718), described welding arc voltage current time sequential distributing signal by the selection of welding arc current controling signal described in described fast digital switch control rule and described welding arc voltage control signal, and drives the described source of welding current to produce the welding arc that can control metal transfer.
2. metal transfer gas shielded arc welding connected control system according to claim 1; it is characterized in that: described arc short circuit testing circuit (300) is high speed signal comparison circuit (303); described metal transfer Waveform Control system exports preset arc short circuit threshold signal (302) to described arc short circuit testing circuit; described arc short circuit testing circuit receives described arc voltage detection signal (301) and described arc short circuit threshold signal, generates and exports conditions at the arc detection signal (304) to described metal transfer Waveform Control system.
3. metal transfer gas shielded arc welding connected control system according to claim 2; it is characterized in that: described metal transfer Waveform Control system comprises digital filtering treatment system (401) and arc control system (402); described digital filtering treatment system receives described conditions at the arc detection signal and after carrying out digital filtering process, exports to described arc control system (402).
4. metal transfer gas shielded arc welding connected control system according to claim 1, it is characterized in that: described metal transfer Waveform Control system comprises synchronized-pulse control unit (601), described electric arc necking down preliminary examination circuit (600) comprises arc parameters memory circuit (604), digital delay unit (602), parameters memorizing unit (603), intermediate parameters mnemon (605) and compares amplifying unit (606) at a high speed; Described synchronized-pulse control unit can generation time editing pulse signal (501), and exports to described digital delay unit, described parameters memorizing unit and described arc parameters memory circuit; Described arc parameters memory circuit (604) can receive described time division pulse signal (501) and described arc voltage detection signal (301), generates and exports the first arc parameters signal (611) to described intermediate parameters mnemon (605); Described digital delay unit (602) can receive described time division pulse signal (501) and generate time delay synchronization pulse (610); Described intermediate parameters mnemon (605) can receive described time delay synchronization pulse (610) and described first arc parameters signal (611), generates and export the second arc parameters signal (608) to compare amplifying unit (606) and parameters memorizing unit (603) to described high speed; Described parameters memorizing unit (603) can receive described time division pulse signal (501) and described second arc parameters signal (608), generates and export the 3rd arc parameters signal (609) to compare amplifying unit (606) to described high speed; Described high speed compares amplifying unit (606) can receive described second arc parameters signal (608) and described 3rd arc parameters signal (609), generates and exports electric arc necking down control signal (607).
5. a control method for the metal transfer gas shielded arc welding connected control system as described in any one of Claims 1-4, is characterized in that: comprise and weld state of a control as follows:
State 1., according to conditions at the arc detection signal, metal transfer Waveform Control system judges whether electric arc there occurs short circuit, after judging that short circuit occurs, metal transfer Waveform Control system reduces the electric current of the source of welding current until reach the first default setting value by arc voltage current distribution unit system, current regulation unit and voltage regulation unit, and after maintaining one section of default first setting-up time, get the hang of 2.;
State 2., metal transfer Waveform Control system controls the electric current of the source of welding current by arc voltage current distribution unit system, current regulation unit and voltage regulation unit increases with the first rate of change, until after reaching default the second setting value, get the hang of 3.;
State 3., metal transfer Waveform Control system controls the electric current of the source of welding current by arc voltage current distribution unit system, current regulation unit and voltage regulation unit increases with the second rate of change, second rate of change is less than the first rate of change, until electric arc necking down preliminary examination circuit judges that 4. Welding Molten Drop liquid bridge is by after separation, get the hang of;
State 4., metal transfer Waveform Control system reduces the electric current of the source of welding current until default the first setting value by arc voltage current distribution unit system, current regulation unit and voltage regulation unit, and after maintaining one section of default second setting-up time, get the hang of 5.;
State 5., metal transfer Waveform Control system controls the electric current of the source of welding current by arc voltage current distribution unit system, current regulation unit and voltage regulation unit increases with the 3rd rate of change, 3rd rate of change is greater than the first rate of change, until reach the 3rd default setting value, and after maintaining one section of default the 3rd setting-up time, electric current with the 4th rate of change decline until preset the 4th setting value after, get the hang of 6.;
State 6., metal transfer Waveform Control system controls after the electric current of the source of welding current maintains one section of default the 4th setting-up time by arc voltage current distribution unit system, current regulation unit and voltage regulation unit, with the 5th rate of change decline until after the 5th setting value preset, get the hang of 7.;
State 7., metal transfer Waveform Control system passes through the electric current maintenance of arc voltage current distribution unit system, current regulation unit and the voltage regulation unit control source of welding current until arc short circuit generation is next time detected, gets the hang of 1..
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| CN103464866B (en) * | 2013-08-26 | 2015-12-02 | 唐山松下产业机器有限公司 | A kind of welder and control method thereof |
| CN104368897B (en) * | 2014-10-22 | 2017-05-03 | 江苏科技大学 | Gas protection automatic welding control device |
| CN106513935A (en) * | 2016-12-30 | 2017-03-22 | 唐山松下产业机器有限公司 | Arcing state judgment method and device and electric arc welding device |
| CN109317786B (en) * | 2018-12-14 | 2020-08-21 | 唐山松下产业机器有限公司 | Short circuit transition welding control method |
| CN114160925A (en) * | 2021-12-07 | 2022-03-11 | 深圳市麦格米特焊接技术有限公司 | Current blocking method and device, welding system and welding machine |
| CN114682885B (en) * | 2022-03-31 | 2024-01-09 | 深圳市爱达思技术有限公司 | Welding method, device, welding equipment and medium for consumable electrode gas shielded welding |
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