CN100469506C - Method for controlling arc length at beginning as gas shielded arc welding - Google Patents
Method for controlling arc length at beginning as gas shielded arc welding Download PDFInfo
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- CN100469506C CN100469506C CNB2004100638235A CN200410063823A CN100469506C CN 100469506 C CN100469506 C CN 100469506C CN B2004100638235 A CNB2004100638235 A CN B2004100638235A CN 200410063823 A CN200410063823 A CN 200410063823A CN 100469506 C CN100469506 C CN 100469506C
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Abstract
The invention provides an arc-length control method at starting of gas-shielding arc welding with a consumable electrode. During the predetermined initial period Ti from occurrence of arc at welding start time, the arc-length is quickly settled into the reasonable value Lc so that variable speed control at wire feeding speed Fs is performed in addition to output-control of a welding power supply device so as to approximately equalize both the value Vw of welding voltage and the voltage setup value Vr. Thereby the method is capable of improving a transitional property of an arc-length La during an initial period Ti when the arc-length control method detects the arc-length La with a value Vw of welding voltage at occurrence of arc at a weld-starting time t3 and settles the arc-length La into a reasonable value Lc by output-controlling a welding power supply device so as to approximately equalize the value Vw of welding voltage with a predetermined voltage setup value Vr.
Description
Technical field
The present invention relates to a kind of arc length in the consumable electrode gas-arc arc-welding, promptly will begin to weld the time converge steady state begin to weld the time arc length control method for use.
Background technology
When carrying out the consumable electrode gas-arc arc-welding, after the input welding sign on, will begin to sending welding wire, this welding wire contacts with mother metal and produces electric arc.And arc length produces constantly from this electric arc and converges steady state again through behind the transition period.Arc length in this transition period presents overshoot (overshoot), the following transient characteristics such as (undershoot) that dashes.According to the material character of welding wire, the front end particle diameter of welding wire, the material character of mother metal, the various welding conditions such as surface state of mother metal, welding wire load condition in the transition period can change to some extent, therefore, be accompanied by these and change, also there are various situations in the transient characteristic of welding wire length.Particularly, under the situation of using aluminium wire, when beginning to weld, the long-term short circuit that surpasses tens of ms of welding wire and mother metal takes place easily, therefore, after just producing electric arc, arc length can become and grow very much (about 10mm), and the transition period that needs in order to converge steady state (about 3mm) is very long, be about 500ms.Like this, if the transient characteristic of the arc length when beginning to weld is bad, the welding quality such as fusion penetration, welding bead outward appearance of then welding beginning portion also can be poor.Therefore, the transient characteristic with good arc length is considerable.
Fig. 8 is the output waveform figure of the arc length control method for use of expression conventional art.Figure (A) expression arc length La[mm] oscillogram, figure (B) expression weldingvoltage Vw[V] oscillogram, figure (C) expression welding current Iw[A] oscillogram, figure (D) expression welding wire give and send speed Fs[m/min] oscillogram.Weldingvoltage Vw and welding current Iw by the low pass filter about hundreds of Hz, make instant value separately become level and smooth value.Below, describe with reference to this figure.
At moment t1, after welding supply input welding sign on, shown in this figure (B), will add weldingvoltage Vw, and shown in this figure (D), welding wire will be to be sent the slow reducing speed of speed Fsc to carry out to sending than constant welding wire.At moment t2, welding wire contacts with mother metal, and shown in this figure (B), weldingvoltage Vw will become the short-circuit voltage value.During the short circuit of moment t2～t3 among the Ts, shown in this figure (C), for removing this short-circuit condition as early as possible, and feed big electric current.In addition, welding wire is sent speed Fs still to keep original reducing speed (also can adopt during short circuit and stop among the Ts to the method for sending).
At moment t3, produce electric arc, then shown in this figure (A), arc length La will converge constant arc length Lc through the transition period Tt before moment t4.The arc length control of conventional art utilizes arc length La and the roughly proportional relation of weldingvoltage Vw to carry out arc length control.That is, shown in this figure (B), utilize weldingvoltage Vw to detect arc length La, carry out the output control of welding supply, so that this weldingvoltage Vw roughly equates with the voltage setting value Vr that is equivalent to constant arc length Lc.Shown in this figure (A), the arc length La overshoot among the transition period Tt, therefore, shown in this figure (B), weldingvoltage Vw also becomes roughly identical with arc length La waveform.Carry out the output control of weldingvoltage Vw, so that this weldingvoltage Vw and voltage setting value Vr are about equally, and shown in this figure (C), based on the relation between this output control and the electric arc load, when arc length La was elongated, welding current Iw can diminish.Because there are roughly proportional relation in welding wire melting rate and welding current Iw, so when welding current Iw diminished, arc-melting speed was slack-off, and arc length La diminishes.At this moment, shown in this figure (D), when moment t3 produced electric arc, welding wire sent speed Fsc constant speed to be sent to sending speed Fs to give with constant welding wire.Thereby the method for the arc length control of conventional art is: form the constant voltage characteristic that is equivalent to voltage setting value Vr by output control, the variation according to arc length La makes welding current Iw variation that welding wire melting rate is changed again, and then carries out the control of arc length La.That is, make welding wire fix for the speed Fs of sending, change welding wire melting rate, thus control arc length La.Among Fig. 8, just produced arc length La behind the electric arc (below, be called initial stage arc length La) and be value, thereby obtained the transient characteristic of good arc length La near constant arc length Lc.
Fig. 9 is the output waveform figure of the very big situation of the transient characteristic overshoot very long, arc length of the initial stage arc length Ls when beginning to weld.(A)～(D) among each signal of (A)～(D) among this figure and above-mentioned Fig. 8 is identical.Just having produced the elongated reason of arc length La after the electric arc at moment t3, as mentioned above, had multiple reason because of welding condition is different, and among this Fig. 9, is that the situation of the long-term short circuit more than tens of ms is that example describes with Ts during the short circuit of moment t2～t3.Long-term short circuit phenomenon like this is the phenomenon that takes place repeatedly when beginning to weld, and as mentioned above, welding wire is just to take place easily under the situation of aluminium wire.If long-term short circuit takes place, then electric arc is promptly lighted at once after just producing electric arc, and many times the in the initial stage of that arc length Ls grows to about 10mm.Its reason is: flow through big electric current and the protuberance that makes welding wire is in the condition of high temperature by abundant heating in long-term short circuit, therefore be easy to the fusing of generation midway at the welding wire protuberance, and easily produce electric arc from the high position.Again because: after producing electric arc, begin fusing, it is big that arc length becomes rapidly quickly.Below, describe with reference to this Fig. 9.
When Ts was long-term short circuit during the short circuit of moment t2～t3, shown in this Fig. 9 (A), after moment t3 produced electric arc, arc length La lighted rapidly and becomes very long.Therefore, the transient characteristic overshoot of arc length is very big, and through long transition period Tt, converges on constant arc length Lc.In this transition period Tt, shown in this figure (B), weldingvoltage Vw becomes roughly and the proportional waveform of arc length La, and as mentioned above, exports control weldingvoltage Vw is roughly equated with voltage setting value Vr.Therefore, shown in this figure (C), welding current Iw during transition becomes littler than steady state value Ic among the Tt, and welding wire melting rate Ms[m/min] slack-off.Arc length La gives according to welding wire melting rate Ms and welding wire and send speed Fs[m/min] difference change.That is arc length rate of change dL/dt=Ms-Fs.Here, to send speed Fs be certain value because welding wire is given, and therefore, as mentioned above, welding current Iw diminishes, and metal molten speed Ms becomes and sent speed Fs slow than welding wire, arc length rate of change dL/dt＜0.Arc length rate of change dL/dt＜0 o'clock, arc length La will change to the direction that shortens.Its result, arc length La shortens gradually from long state, converges on constant arc length Lc.
Below, describe with the variation of numerical example above-mentioned arc length La.Consider that arc length La lights to 10mm, welding wire and give the situation of sending speed Fs=12m/min.Be assumed to welding current Iw and become very little and welding wire melting rate Ms when being roughly 0 extreme case, arc length rate of change dL/dt=Ms-Fs=-12m/min.Thereby it is 7mm/ (1200mm/min)=0.35 second that arc length La converges to constant arc length Lc=3mm required time from 10mm.In fact, because welding current Iw can not become 0, so welding wire melting rate Ms can not become 0 yet.Thereby above-mentioned transition period Tt is actually long-time about 0.5 second.In the process of this long transition period Tt, shown in this Fig. 9 (C), welding current Iw continues to be in the state littler than steady state value Ic.When continuing the little state of welding current Iw, as shown in figure 10, the fusion penetration 2c of welding beginning portion will be shallow when constant.And because the deposited amount and the welding current value Iw of welding wire are roughly proportional, therefore, if welding current Iw is in little state continuously, the welding bead 2a that then welds beginning portion will be thinner than steady state.In addition, arc length La will be in outside the normal range (NR), and the state of electric arc also can be unstable, therefore, can produce the 2b that much splashes.Like this, just produced the back at electric arc, arc length La is very long, the welding quality of welding beginning portion is with non-constant.Above, at the long situation of initial stage arc length Ls, be illustrated, and opposite under short situation, welding current Iw is big at long-time internal ratio steady state value Ic, therefore, still can make the non-constant of welding quality of welding beginning portion.
Shown in Fig. 9 (D), welding wire is sent speed Fs to carry out to sending with certain value as L1 usually.But, a kind of following method has been proposed, promptly in the conventional art, in order to improve arc starting performance, after producing electric arc, give as mild increase welding wire the L2 and to send speed Fs or as L3, during certain, to set welding wire at a high speed to being sent speed Fs (for example, with reference to patent documentation 1,2).Yet, in these methods, with the transient characteristic of arc length etc. without any relation, and in specified time limit, welding wire is sent speed Fs will be different from steady state value Fsc.Therefore, can not improve the transient characteristic of arc length.
Patent documentation 1: special fair 8-18128 communique
Patent documentation 2: special flat 2002-86270 communique
As mentioned above, if the initial stage arc length that has just produced when beginning to weld after the electric arc is long or too short, then the arc length transition period that converges on steady state value will prolong, and transient characteristic also can variation.Therefore, arc length has very big change, and for its convergence, also will carry out very big change to welding current.Its result, fusion penetration, welding bead outward appearance etc. can change, thus the welding quality variation of welding beginning portion.The typical example of the reason that the arc length after just producing electric arc is long is the situation that long-term short circuit takes place, and in addition according to welding condition, also has various main causes.Equally, the reason that arc length is too short also has various situations.
Summary of the invention
The invention provides can a kind of transient characteristic that can improve the arc length when beginning to weld, thus make the welding quality of welding beginning portion good begin to weld the time arc length control method for use.
For solving above-mentioned problem; first invention; provide a kind of consumable electrode gas-arc arc-welding begin to weld the time arc length control method for use; after when beginning to weld, producing electric arc; detect arc length by welding voltage value, the output of control welding supply makes this welding voltage value and predetermined voltage setting value about equally; thereby arc length is converged to appropriate value, it is characterized in that:
When beginning to weld after producing electric arc during the predetermined initial stage, except the output control of carrying out above-mentioned welding supply, also sent speed to carry out FEEDBACK CONTROL to welding wire, thereby make above-mentioned welding voltage value and above-mentioned voltage setting value promptly arc length be converged to appropriate value about equally, and, after having passed through during the above-mentioned initial stage, above-mentioned welding wire given send speed to be set as the predetermined constant speed of sending of giving, by the output control of above-mentioned welding supply, arc length is maintained appropriate value simultaneously.
In addition, second invention, provide the consumable electrode gas-arc arc-welding that provides in first invention begin to weld the time arc length control method for use, it is characterized in that: welding wire when correspondence begins to weld and the time span during the short circuit between the mother metal were come during the change initial stage.
In addition; the 3rd invention; provide the consumable electrode gas-arc arc-welding that provides in first invention or second invention begin to weld the time arc length control method for use, it is characterized in that: sent the speed to be limited in the predetermined limited field welding wire of FEEDBACK CONTROL in during the initial stage.
In addition; the 4th invention; provide consumable electrode gas-arc arc-welding that first invention provides to the 3rd invention begin to weld the time arc length control method for use; it is characterized in that: with after during the initial stage, compare the gain of the FEEDBACK CONTROL during the output of the welding supply in during the less ground setting initial stage is controlled.
According to above-mentioned first invention, carry out the output control of welding supply simultaneously and give and send speed Control by the voltage error between corresponding welding voltage value in during in the early stage and the voltage setting value, can reduce the amplitude of variation of welding current, and improve the transient characteristic of arc length, its result can obtain having the fusion penetration of welding beginning portion of good quality and welding bead outward appearance etc.
In addition, according to above-mentioned second invention, the time span during the short circuit when beginning to weld by correspondence was come during the change initial stage, thereby after the transient characteristic convergence of arc length, stop speed Control, therefore at once, except above-mentioned effect, also alleviated welding wire and given the burden of sending motor etc.
In addition, according to above-mentioned the 3rd invention, by will except above-mentioned effect, preventing the instability that welding wire is given the conditions at the arc of sending excessive velocities or causing excessively slowly by being sent speed to be limited within the predetermined limited field for the welding wire that send speed Control to determine.
In addition, according to above-mentioned the 4th invention, in during in the early stage, with through comparing the voltage gain of the output control that reduces welding supply after during the initial stage, thereby can reduce the amplitude of variation of welding current more, therefore, except above-mentioned effect, can also improve the welding quality of welding beginning portion more.
Description of drawings
Fig. 1 is the output waveform figure of embodiment of the present invention 1.
Fig. 2 is the block diagram of the welding supply of embodiment of the present invention 1.
Fig. 3 is the block diagram of the welding supply of embodiment of the present invention 2.
Fig. 4 is the output waveform figure of embodiment of the present invention 3.
Fig. 5 is the block diagram of the welding supply of embodiment of the present invention 3.
Fig. 6 is the output waveform figure of embodiment of the present invention 4.
Fig. 7 is the block diagram of the welding supply of embodiment of the present invention 4.
Fig. 8 is the output waveform figure of conventional art.
Fig. 9 is the output waveform figure of the problem of expression conventional art.
Figure 10 is the welding bead outside drawing and the welding bead cutaway view of conventional art.
Among the figure: 1-welding wire, 2-mother metal, 2a-welding bead, 2b-splash, 2c-fusion penetration, 3-electric arc, 4-welding torch, 5-give and send roller, dL/dt-arc length rate of change, DV-drive circuit, Dv-driving signal, Ef-sent error amplification signal, EV-voltage error circuit, Ev-voltage error amplifying signal, FC-give and send control circuit, Fc-give and send control signal, FR-give and send the speed initialization circuit, Fr-give and send rate setting signal, Frc-give and send the speed Control setting signal, Fs-welding wire is given the speed of sending, and Fsc-constant welding wire is given the speed of sending, GF-give and send error amplifying circuit, Gf-give and send gain, GV-voltage error amplifying circuit, Gv-voltage gain, GV2-the 2nd voltage error amplifying circuit, IC-error intergal circuit, Ic-constant weld current value, IC2-the 2nd error intergal circuit, Iw-welding current, L1～L3-give and send characteristic, La-arc length, Lc-constant arc length, Ms-welding wire melting rate, PM-electric power main circuit, SW-commutation circuit, Sw-switching output signal is during Ti-initial stage, initialization circuit during TIR-initial stage, setting signal during Tir-initial stage, during Ts-short circuit, measuring circuit during TSD-short circuit, instrumentation signal during Tsd-short circuit, Tt-transition period, timing circuit during TTI-initial stage, signal during Tti-initial stage, VD-voltage detecting circuit, Vd-voltage detection signal, VR-voltage setting circuit, Vr-voltage is set (value/signal), Vw-weldingvoltage, W-limited field, WM-welding wire are given and are sent motor, △ V-voltage error (signal).
The specific embodiment
(embodiment 1)
Embodiments of the present invention 1 are: produce when beginning to weld behind the electric arc during the predetermined initial stage the Ti process, carry out the output control of welding supply, make welding voltage value Vw and voltage setting value Vr about equally, and, give the speed Control of sending speed Fs by carrying out welding wire, promptly arc length is converged to appropriate value, and passed through during the initial stage after the Ti, welding wire given send speed to be set as predetermined constant giving when sending speed Fsc, by welding supply output control, arc length is maintained suitable value.That is, the voltage error △ V=Vr-Vw between voltage setting value Vr and the welding voltage value Vw is carried out FEEDBACK CONTROL, carry out the output control and the welding wire of welding supply simultaneously and give the speed Control of sending speed Fs.Below, describe with reference to accompanying drawing.
Fig. 1 is the output waveform figure of embodiment of the present invention 1.Oscillogram, this figure (D) expression welding wire of the oscillogram of the oscillogram of this figure (A) expression arc length La, this figure (B) expression weldingvoltage Vw, this figure (C) expression welding current Iw are given the oscillogram of sending speed Fs.This figure is the same with above-mentioned Fig. 9 situation, expression be: when beginning to weld, produce long-term short circuit T s, and the situation about growing very much of the initial stage arc length Ls after just producing electric arc.Below, describe with reference to this figure.
At moment t3, remove long-term short circuit T s, behind the generation electric arc, then shown in this figure (A), arc length La will promptly become long state.Therefore, will become bigger with the roughly proportional welding voltage value Vw of arc length La than voltage setting value Vr.At this moment, corresponding voltage error △ V=Vr-Vw carries out the output control of welding supply, its result, and shown in this figure (C), welding current Iw will reduce.In addition, meanwhile, corresponding to above-mentioned voltage error △ V, shown in this figure (D), welding wire is sent speed Fs to increase by speed Control.This welding wire is given and to be sent the increase of speed Fs to change corresponding to voltage error △ V, rather than according to predetermined mode producing.
As mentioned above, arc length rate of change dL/dt=Ms-Fs.Welding current Iw reduces, and then welding wire melting rate Ms also can diminish, and welding wire is sent speed Fs to become bigger than steady state value Fsc by speed Control, and therefore, arc length rate of change dL/dt will become negative value, and its absolute value will become big simultaneously.Thereby shown in this figure (A), arc length La will have good transient characteristic, and its transition period Tt also can shorten significantly, and at moment t4, converge constant arc length Lc.That is, welding wire melting rate Ms is changed, also change welding wire simultaneously and sent speed Fs, thereby increased the arc length rate of change, improved its transient characteristic.In the technology in the past, owing to only change arc length La, therefore,, must depart from steady state value Ic and change welding wire melting rate Ms (welding current Iw) greatly in order to increase the arc length rate of change by welding wire melting rate Ms (welding current Iw) is changed.Yet, in the present invention, owing to sent speed Fs to share the arc length rate of change with welding wire melting rate Ms and welding wire; therefore not only transition period Tt has shortened; and shown in this figure (C), the variation of welding current Iw (welding wire melting rate Ms) also can diminish than in the past.Its result owing to can shorten transition period Tt, also can make the amplitude of fluctuation of welding current Iw diminish simultaneously, therefore, can improve fusion penetration, welding bead outward appearance etc.By to the voltage gain Gv that changes welding wire melting rate Ms according to voltage error △ V and change welding wire give send speed Fs sent gain G f to adjust, thereby can determine to be related to the share rate of arc length rate of change.That is, welding wire melting rate Ms carries out FEEDBACK CONTROL according to Gv * △ V, and welding wire is sent speed Fs to carry out FEEDBACK CONTROL according to Gf * △ V.
Among this Fig. 1, during the transition period Tt that has been equivalent to shorten, or than during long slightly during this, Ti during the setting initial stage.At moment t5, passed through during the initial stage behind the Ti, then shown in this figure (D), stop welding wire and give the speed Control of sending speed Fs, and, carry out to sending with the constant certain value that send speed Fsc of giving.Only arc length is controlled by output control.That is, after Ti during the initial stage, carry out general arc length control.This is because in case arc length La converges on after the constant arc length Lc, can keep good state by the arc length control according to output control.
Fig. 2 is the block diagram of the welding supply of embodiment of the present invention 1.Below, with reference to this figure each square frame is described.
Electric power main circuit PM, the input worker carries out output controls such as VFC with AC power (3 phase 200V etc.) according to driving signal Dv described later, and weldingvoltage Vw and welding current Iw that output is suitable for welding.Welding wire 1 send by giving with welding wire that motor WM is direct-connected to give the rotation of sending roller 5, give with welding wire through welding torch 4 and send speed Fs to carry out to giving, and mother metal 2 between produce electric arc 3.
Voltage detecting circuit VD detects above-mentioned weldingvoltage Vw, voltage sense signal Vd.The predetermined voltage setting signal Vr of voltage setting circuit VR output.Voltage error circuit EV calculates the error of above-mentioned voltage setting signal Vr and above-mentioned voltage detection signal Vd, and output voltage error signal △ V=Vr-Vd.Voltage error amplifying circuit GV multiply by predetermined voltage gain Gv to above-mentioned voltage error signal △ V, and output voltage error amplifying signal Ev=Gv * △ V.Drive circuit DV exports the driving signal Dv of control according to above-mentioned voltage error amplifying signal Ev output to above-mentioned electric power main circuit PM.
Initialization circuit TIR output is used to set setting signal Tir during initial stage of the time span during the predetermined initial stage during initial stage.Timing circuit TTI judges that according to above-mentioned voltage detection signal Vd the electric arc when beginning to weld produces during initial stage, and from this moment, exports by signal during the initial stage of high level during the initial stage of setting signal Tir decision during the above-mentioned initial stage.Give and to send error amplifying circuit GF that above-mentioned voltage error signal △ V be multiply by predetermined to be sent gain G f, send error amplification signal Ef=Gf * △ V and export to.The error intergal IC circuit is sent error amplification signal Ef to carry out integration to above-mentioned, and exports to and send speed Control setting signal Frc.Give and send predetermined the giving of speed initialization circuit FR output to send rate setting signal Fr.Commutation circuit SW, be transformed into a side when signal Tti is high level during the above-mentioned initial stage, and send speed Control setting signal Frc as switching output signal Sw output above-mentioned the giving, and when low level, be transformed into the b side, and send rate setting signal Fr as switching output signal Sw output above-mentioned giving.Give and to be sent control circuit FC according to above-mentioned switching output signal Sw, output is used to control welding wire and gives and send giving that giving of motor WM send to send control signal Fc.As mentioned above, can be according to signal Tti during the initial stage, switching giving to send speed Control setting signal Frc and give to send between the rate setting signal Fr, thereby in only during the initial stage after producing electric arc, carrying out to sending speed Control.
(embodiment 2)
Embodiments of the present invention 2, in above-mentioned embodiment 1, the time span of Ts is come Ti during the change initial stage during welding wire when beginning to weld and the short circuit between the mother metal.This be because: as mentioned above, when beginning to weld, just produced the very long representational situation of arc length after the electric arc and be that Ts is the situation of long-term short circuit during the above-mentioned short circuit.And the time span of Ts changes during the short circuit of initial stage arc length when beginning to weld, and its result, transition period changes.So by coming Ti during the change initial stage according to the time span of Ts during the short circuit, and the moment that can restrain, become steady state in arc length immediately switches to the arc length control that conforms to steady state.That is, send speed Control that welding wire motor etc. is caused burden, so wish to stop this control immediately entering when there is no need to carry out the steady state of this control owing to give.
Fig. 3 is the block diagram of the welding supply of above-mentioned embodiment 2.In the figure, and marked same symbol in the same square frame of above-mentioned Fig. 2, omitted explanation them.Below, the square frame that dot different with Fig. 2 described.
Measuring circuit TSD judges during the short circuit when beginning to weld according to voltage detection signal Vd during the short circuit, and its time length of instrumentation, instrumentation signal Tsd during the output short-circuit.During second initial stage initialization circuit TIR2 according to above-mentioned short circuit during instrumentation signal Tsd value, come time span during the change initial stage according to predetermined function, thereby setting signal Tir during the output initial stage.Below, an example of this function is shown.
If Tsd＜0.1 second, then Tir=0.1 second
If Tsd 〉=0.1 second, then Tir=0.3 second
(embodiment 3)
Embodiments of the present invention 3, in above-mentioned embodiment 1 or 2, with among the Ti during the initial stage by being sent speed Fs for the welding wire send speed Control to determine, be limited in the predetermined limited field W.The reason of doing like this is: sent speed Control by the welding wire that carries out based on the voltage error among the Ti during the initial stage, make welding wire change for the speed Fs of sending significantly.And if this changing value has exceeded prescribed limit, then can produce to give and send speed Fs to become too fast or cross the unsettled situation of arcuation attitude of sending a telegraph of leading slowly because of welding wire.Thereby,, can prevent the conditions at the arc instability by being limited in the predetermined limited field W by being sent speed Fs for the welding wire that send speed Control to determine.This limited field W is set at, hardly can be to the scope that effect is brought the value of any influence of improving as the transient characteristic of the arc length of the object of the invention.Below, describe with reference to accompanying drawing.
Fig. 4 is the output waveform figure of above-mentioned embodiment 3.In the figure, except this figure (D), other figure is the same with corresponding figure among Fig. 1, therefore, omits the explanation to them here.Below, to Fig. 1 in different this figure (D), describe.
Shown in this figure (D), in the early stage during among the Ti, welding wire is given and is sent speed Fs to carry out to sending speed Control based on voltage error, so its value changes big.Sent the excursion of speed Fs to be limited in the predetermined limited field W this welding wire.Its result shown in the A of this figure (D), has limited welding wire and has given the higher limit of sending speed Fs.This restriction produces any influence hardly to the transient characteristic of arc length.
Fig. 5 is the block diagram of the welding supply of above-mentioned embodiment 3.Among this figure, be to realize embodiment 3 as the basis with above-mentioned Fig. 3 (embodiment 2).Thereby, in the figure, and marked same symbol in the same square frame of above-mentioned Fig. 3, omit explanation to them.Below, the square frame that dots to different with Fig. 3 describes.
The 2nd error intergal IC circuit 2 is sent error amplification signal Ef to carry out integration to giving, and its value is limited in the predetermined limited field W, exports to and send speed Control setting signal Frc.This figure with Fig. 3 as the basis, but with Fig. 2 (embodiment 1) as the basis, its situation also is the same.
(embodiment 4)
Embodiments of the present invention 4 in above-mentioned embodiment 1～3, are set the gain G v of the FEEDBACK CONTROL in the output of the welding supply among the Ti during the initial stage control than through little value behind the Ti during the initial stage for.Below, describe with reference to accompanying drawing.
Fig. 6 is the output waveform figure of above-mentioned embodiment 4.This figure and above-mentioned Fig. 1 only have following difference.In the embodiment 4, in the early stage during among the Ti with respect to less ground setting voltage gain G v during after the Ti during the initial stage.Voltage gain Gv determines the value of the output control of welding supply with respect to the gain of the FEEDBACK CONTROL of voltage error △ V as mentioned above.Thereby if the voltage gain Gv during the initial stage among the Ti diminishes, then shown in this figure (C), welding current Iw is with respect to the amplitude of variation of same voltage error △ V also can diminish (B point).On the other hand, for the transient characteristic with arc length remains good state, can increase to sending giving of speed Control to send gain G f.Its result, shown in this figure (D), welding wire is sent the amplitude of variation of speed Fs to increase (D point).Thus, can further reduce the amplitude of variation of welding current Iw, therefore, can make the welding quality when beginning to weld better.
Fig. 7 is the block diagram of the welding supply of above-mentioned embodiment 4.This figure is to serve as that embodiment 4 is realized on the basis with above-mentioned Fig. 5 (embodiment 3).In the figure, and marked same symbol in the same square frame of Fig. 5, omitted explanation them.Below, to Fig. 5 in the different square frames that dots, describe.
The 2nd voltage error amplifying circuit GV2, the voltage gain Gv that signal Tti changes during multiply by according to the initial stage on the voltage error signal △ V, and output voltage error amplifying signal Ev.When signal Tti is high level during the above-mentioned initial stage voltage gain Gv is set at little value, when low level, then is set at big value.As the basis, but based on Fig. 2 (embodiment 1) or Fig. 3 (embodiment 2), its situation too with Fig. 5 for this figure.
Claims (4)
- A consumable electrode gas-arc arc-welding begin to weld the time arc length control method for use; after when beginning to weld, producing electric arc; detect arc length by welding voltage value; the output of control welding supply; the voltage setting value that makes this welding voltage value and be scheduled to about equally; thereby arc length is converged to appropriate value, it is characterized in that:When beginning to weld after producing electric arc during the predetermined initial stage, except the output control of carrying out above-mentioned welding supply, also sent speed to carry out FEEDBACK CONTROL to welding wire, make above-mentioned welding voltage value and above-mentioned voltage setting value about equally, thereby promptly arc length is converged to appropriate value, and, after having passed through during the above-mentioned initial stage, above-mentioned welding wire given send speed to be set as the predetermined constant speed of sending of giving, by the output control of above-mentioned welding supply, arc length is maintained appropriate value simultaneously.
- 2. consumable electrode gas-arc arc-welding as claimed in claim 1 begin to weld the time arc length control method for use, it is characterized in that: welding wire when correspondence begins to weld and the time span during the short circuit between the mother metal were come during the change initial stage.
- 3. consumable electrode gas-arc arc-welding as claimed in claim 1 or 2 begin to weld the time arc length control method for use, it is characterized in that: will be sent speed to be limited in the predetermined limited field by the welding wire that the FEEDBACK CONTROL in during the initial stage is determined.
- 4. consumable electrode gas-arc arc-welding as claimed in claim 1 or 2 begin to weld the time arc length control method for use; it is characterized in that: with during after during the initial stage, compare the gain of the FEEDBACK CONTROL during the output of the welding supply in during the less ground setting initial stage is controlled.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003297288 | 2003-08-21 | ||
| JP2003297288A JP2005066615A (en) | 2003-08-21 | 2003-08-21 | Arc-length control method at starting of gas-shielding arc welding with consumable electrode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1583341A CN1583341A (en) | 2005-02-23 |
| CN100469506C true CN100469506C (en) | 2009-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100638235A Expired - Fee Related CN100469506C (en) | 2003-08-21 | 2004-07-12 | Method for controlling arc length at beginning as gas shielded arc welding |
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| JP (1) | JP2005066615A (en) |
| CN (1) | CN100469506C (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008229704A (en) * | 2007-03-23 | 2008-10-02 | Daihen Corp | Arc start control method for two-electrode arc welding |
| JP5160961B2 (en) * | 2008-05-26 | 2013-03-13 | 株式会社ダイヘン | Feed control method for consumable electrode arc welding |
| CN101612688B (en) * | 2008-06-26 | 2013-10-16 | 北京石油化工学院 | Method for automatically adjusting arc length of slope characteristic type pulse consumable electrode gas shielded welding |
| CN101774969B (en) | 2009-01-13 | 2012-07-04 | 江苏恒瑞医药股份有限公司 | Ivabradine sulfate and method for preparing type I crystal thereof |
| US8859936B2 (en) | 2009-03-23 | 2014-10-14 | Panasonic Corporation | Method of controlling welding |
| FR2945226B1 (en) † | 2009-05-07 | 2012-06-01 | Air Liquide | PRIMING METHOD FOR ARC WELDING |
| CN103917322B (en) * | 2011-10-14 | 2016-12-14 | 维克托设备公司 | Welding wire feeding motor speed controls |
| JP5943460B2 (en) * | 2011-12-27 | 2016-07-05 | 株式会社ダイヘン | Arc start control method for consumable electrode arc welding |
| JP2012086275A (en) * | 2012-02-08 | 2012-05-10 | Daihen Corp | Output control method of power source in consumable electrode arc welding |
| JP5797633B2 (en) * | 2012-10-31 | 2015-10-21 | 株式会社神戸製鋼所 | Arc welding apparatus, constant voltage characteristic welding power source and arc welding method |
| JP6636004B2 (en) | 2017-11-28 | 2020-01-29 | 株式会社ダイヘン | Arc start adjusting device, welding system, arc start adjusting method, and computer program |
| CN111037061B (en) * | 2019-12-30 | 2022-03-18 | 唐山松下产业机器有限公司 | Welding equipment, arc striking control device and method |
| JP7429598B2 (en) | 2020-05-13 | 2024-02-08 | 株式会社ダイヘン | arc welding power supply |
-
2003
- 2003-08-21 JP JP2003297288A patent/JP2005066615A/en active Pending
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2004
- 2004-07-12 CN CNB2004100638235A patent/CN100469506C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| JP2005066615A (en) | 2005-03-17 |
| CN1583341A (en) | 2005-02-23 |
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