CN101376191A - Pulse arc welding control method - Google Patents
Pulse arc welding control method Download PDFInfo
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- CN101376191A CN101376191A CNA2008101445986A CN200810144598A CN101376191A CN 101376191 A CN101376191 A CN 101376191A CN A2008101445986 A CNA2008101445986 A CN A2008101445986A CN 200810144598 A CN200810144598 A CN 200810144598A CN 101376191 A CN101376191 A CN 101376191A
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Abstract
An impulse arc welding control method comprises: repeating electrifying using the electrifying of peak current of in peak period and the electrifying of background current in background period as impulse period; controlling the arc length in the manner that the welding voltage value (Vw) is approximately equal to the set voltage value (Vs); making the arc length to vary periodically by making the set voltage value (Vs) to vary synchronistically with the switching signal (Stc); making the impulse parameter (Ps) to vary synchronistically with the switching signal (Stc); and changing the sending speed (Fs) from the time the switching signal (Stc) varying starts to the time arc length (La) transition varying approximately converges. Thus, the major varying of arc force make the shake movement of the bath becomes more intensive to improve the air bubble reducing effect. Consequently, the air bubble reducing effect is improved in the impulse arc welding method with arc length varied periodically.
Description
Technical field
The present invention is chiefly directed to by changing arc length periodically the molten bath is shaken, and is used to improve the pulse arc welding control method of welding performance thus in the welding method of the generation of controlling bubble.
Background technology
In pulsed arc welding, often use by change pulse parameter periodically, weldingvoltage waits and changes arc length periodically, fusion range is changed obtain the welding method (below, be referred to as the arc length variations pulse arc welding control method) of the beautiful weld appearance of squamous shown in Figure 8.In addition, in the welding of this arc length variations pulsed arc, the variation by arc length can make the molten bath shake, and can control gassing.This arc length variations pulse arc welding method mainly is used for the welding of aluminum or aluminum alloy more.This is because the thermal conductivity of aluminium well can form the ripple weld with sharp power, but the poor thermal conductivity of steel is difficult to form the cause of the ripple weld with sharp power.Below, the pulse arc welding method of the arc length variations of prior art is described (for example, with reference to patent documentation 1,2).
Fig. 9 is the oscillogram of the arc length variations pulse arc welding method of expression conventional art.This figure (A) expression switching signal sTC, this figure (B) expression welding current Iw, this figure (C) expression weldingvoltage Vw, this figure (D) expression arc length La.Followingly describe with reference to this figure.
Shown in figure (A), switching signal Stc is a high level pulse among the HT during predetermined high impulse, is low level pulse in predetermined low impulse duration LT.During during this high impulse after HT and the low impulse duration LT addition is switching cycle Tc.
During the high impulse among the HT, shown in figure (B), the high impulse set of currents that energising is made of the high background current HIb among the HTb during high peak current HIp among the HTp during the peak value and the high base value.During this peak value during HTp and the high base value HTb addition become HTf during the high impulse.And, corresponding with the energising of this high impulse set of currents, shown in this figure (C), during peak value among the HTp to applying peak voltage HVp between welding wire/mother metal, apply high base value voltage HVb during the high base value among the HTb.
Among the low impulse duration LT, shown in this figure (B), the low pulse current group that the low background current LIb during low peak current LIp during the energising low peak among the LTp and the low base value among the LTb constitutes.During this low peak during LTp and the low base value LTb add up to low pulse period LTf.And, corresponding with the energising of this low pulse current group, shown in this figure (C), during low peak among the LTp to applying lower peak voltages LVp between welding wire/mother metal, during low base value, apply low base value voltage LVb among the LTb.
In the consumable electrode arc welding that comprises the pulsed arc welding, to make arc length maintain the arc length control of appropriate value in order to obtain good welding quality.Usually, the control of this arc length utilizes the roughly directly proportional relation of weldingvoltage Vw and arc length, and the mode that equates with the voltage setting value of being scheduled to according to weldingvoltage Vw is controlled the output of the source of welding current.In the welding of the pulsed arc shown in this figure, equally weldingvoltage Vw is carried out the output that FEEDBACK CONTROL is controlled the source of welding current.At this moment, according to the method for FEEDBACK CONTROL, can be divided into following three kinds.
(1) mode that equates with voltage setting value according to the mean value of weldingvoltage Vw changes the pulse period.At this moment, between the peak period, peak current value and background current value be pulse parameter, is set in predetermined appropriate value.
(2) mode that equates with voltage setting value according to the mean value of weldingvoltage Vw changed between the peak period.At this moment, peak current value, pulse period and background current value are pulse parameter, are set in predetermined appropriate value.
(3) mode that equates with voltage setting value according to the crest voltage value of weldingvoltage Vw changes peak point current.At this moment, between the peak period, pulse period and background current value be pulse parameter, is set in predetermined appropriate value.
As mentioned above, in the arc length control of pulsed arc welding, weldingvoltage Vw is carried out FEEDBACK CONTROL, make it change the output of controlling the source of welding current as operational ton one of pulse parameter, other pulse parameters are set in setting.In the figure, shown in above-mentioned (1), the mode that equates with voltage setting value according to the mean value of weldingvoltage Vw changes the pulse period.Therefore, at this moment, between the peak period, peak point current and background current be the pulse parameter of setting.In the arc length pulsed arc shown in this figure welding, during high impulse among HT and the low impulse duration LT, but not shownly make voltage setting value (high voltage setting value and low voltage set value) variation.And then, during high impulse, be set at HTp, high peak current HIp and high background current HIb during the peak value among the HT, in low impulse duration LT, be set at low impulse duration LTp, low pulse current LIp and low background current LIb, change pulse parameter.Its result, shown in this figure (D), arc length La changes in high arc length HLa and low arc length LLa periodically.
Patent documentation 1: No. 2993174 communique of patent
Patent documentation 2: 2003-No. 260565 communiques of TOHKEMY
In the welding of the arc length pulsed arc of conventional art, after will the speed of giving being made as certain value, change arc length periodically by changing voltage setting value and pulse parameter periodically.When bubble reduces effect and sees the conventional art, if the molten bath is shaken more tempestuously then it reduces effect and can further improve.But, in the prior art, because voltage setting value and pulse parameter are changed when big arc stability more than this poor, so the shaking to act on and have boundary of molten bath.
Summary of the invention
Main purpose of the present invention is, provide a kind of can be more violent by the effect of shaking that makes the molten bath, further increase the pulse arc welding control method that bubble reduces effect.
In order to address the above problem, the pulse arc welding control method of technical solution of the present invention one, when giving welding wire, the energising of the background current in during the energising of the peak point current between the peak period and the base value was switched on repeatedly as the pulse period, carry out arc length control according to welding voltage value and voltage setting value mode about equally, by above-mentioned voltage setting value being changed periodically arc length is changed periodically with switching signal, and and above-mentioned switching signal synchronously made between the above-mentioned peak period, above-mentioned peak point current or above-mentioned pulse period, at least more than one pulse parameter changed, and synchronously changed the speed of giving of welding wire with above-mentioned switching signal.
The pulse arc welding control method of technical solution of the present invention two, according to technical scheme one described pulse arc welding control method, after having begun to postpone during the transition change of above-mentioned arc length roughly restrains from the moment that above-mentioned switching signal changes, the above-mentioned speed of giving changes again.
The pulse arc welding control method of technical solution of the present invention three, according to technical scheme one described pulse arc welding control method, above-mentioned voltage setting value and above-mentioned pulse parameter change after having begun to postpone during above-mentioned transition change of giving speed roughly restrains from the moment that above-mentioned switching signal changes again.
The pulse arc welding control method of technical solution of the present invention four, according to technical scheme one each described pulse arc welding control method in the technical scheme three, set above-mentioned voltage setting value and make the following variation of arc length: according to above-mentioned switching signal change above-mentioned give slow-footed during in arc length longer than the above-mentioned arc length of giving during fireballing.
The pulse arc welding control method of technical solution of the present invention five according to technical scheme one each described pulse arc welding control method in the technical scheme four, makes above-mentioned to have slope when giving the variation of speed.
(invention effect)
According to technique scheme one, synchronously change voltage setting value, pulse parameter and give speed with switching signal, the arc force to the molten bath is changed greatly, therefore the molten bath is shaken acutely.Therefore compare with technology in the past and can improve bubble minimizing effect, can carry out high quality welding.
According to technique scheme two, in the moment that switching signal changes voltage setting value and pulse parameter are changed in advance, be deferred to the moment that the transition change of arc length roughly restrains, the speed of giving changes again.Therefore, on the basis of the effect of technical scheme one, can improve the arc stability when switching.
According to technique scheme three, exercise earlier in the moment that switching signal changes and to give velocity variations, be deferred to the moment that the transition change of the speed of giving roughly restrains and make voltage setting value and pulse parameter changes.Therefore except that the effect of technical scheme one, can also improve the arc stability when switching.
According to technique scheme four, by changing voltage setting value, so that the arc length of the speed of giving when fast is short, the arc length the when speed of giving is slow is long, can make arc force change greatlyyer thus.Therefore, can make the effect of shaking in molten bath more violent, further improve bubble and reduce effect.
According to technique scheme five,, to the basis of technical scheme four, make when giving velocity variations, to have slope in technical scheme one, can suppress the less stress and the overshoot of the speed of giving thus.Therefore can suppress electric arc instability with less stress and overshoot.
Description of drawings
Fig. 1 is the sequential chart of the pulse arc welding control method of expression embodiments of the present invention 1.
Fig. 2 is the block diagram of the source of welding current of embodiments of the present invention 1.
Fig. 3 is the sequential chart of the pulse arc welding control method of expression embodiments of the present invention 2.
Fig. 4 is the block diagram of the source of welding current of expression embodiments of the present invention 2.
Fig. 5 is the sequential chart of the pulse arc welding control method of expression embodiments of the present invention 3.
Fig. 6 is the block diagram of the source of welding current of expression embodiments of the present invention 3.
Fig. 7 is the sequential chart of the pulse arc welding control method of expression embodiment of the present invention 4.
Fig. 8 is the figure of the ripple weld of expression conventional art.
Fig. 9 is the oscillogram of the arc length variations pulse arc welding method of expression conventional art.
Symbol description among the figure:
1-welding wire;
2-mother metal;
3-electric arc;
4-welding gun;
5-thread delivering roller;
DLf-give speed delay circuit;
EI-current error amplifying circuit;
Ei-current error amplifying signal;
EV-voltage error amplifying circuit;
Ev-voltage error amplifying signal;
FC-give speed control circuit;
Fd-give speed detection signal;
Fs-give rate setting signal;
HFs-height is given speed setting value;
HIb-high background current;
HIp-high peak current;
HIps-high peak current setting value;
HLa-high arc length;
HPs-high impulse pre-set parameter;
During HT-high impulse;
During HTb-high base value;
HTf-high impulse cycle;
During HTp-peak value;
Set value during HTps-peak value;
Set value during HTs-high impulse;
HVb-high base value voltage;
HVp-peak voltage;
HVs-high voltage setting value;
IBS-background current initialization circuit;
Ibs-background current setting signal;
ID-current detection circuit;
Id-current detection signal;
IPS-peak point current initialization circuit;
Ips-peak point current setting signal;
ISC-current settings control circuit;
Isc-current settings control signal;
Iw-welding current;
La-arc length;
LFs-low the speed setting value of giving;
LIb-low background current;
LIp-low peak current;
LIps-low peak current setting value;
LLa-low arc length;
LPs-low pulse parameter value of setting;
LT-low impulse duration;
During LTb-low base value;
LTf-low pulse period;
During LTp-low peak;
Set value during LTps-low peak;
LTs-low impulse duration setting value;
LVb-low base value voltage;
LVp-lower peak voltages;
LVs-low voltage set value;
PM-electric power main circuit;
Ps-pulse parameter setting signal;
Sa-first postpones switching signal;
Sb-second postpones switching signal;
STC-switching signal generative circuit;
STC-switching signal;
Tc-switching cycle;
Tf-pulse-period signal;
Timing circuit between TP-peak period;
Signal between Tp-peak period;
Initialization circuit between TPS-peak period;
Setting signal between Tps-peak period;
VAV-average voltage counting circuit;
Vav-average voltage signal;
VD-voltage detecting circuit;
Vd-voltage detection signal;
VF-voltage/frequency translation circuit;
VS-voltage setting circuit;
Vs-voltage setting signal;
Vw-weldingvoltage;
WM-give motor
The specific embodiment
Below, with reference to accompanying drawing embodiments of the present invention are described.
(embodiment 1)
Fig. 1 is the sequential chart of the pulse arc welding control method of expression embodiments of the present invention 1.This figure (A) expression switching signal Stc, this figure (B) indicating impulse setting parameter signal Ps, this figure (C) expression voltage setting signal Vs, rate setting signal Fs is given in this figure (D) expression, this figure (E) expression welding current Iw, this figure (F) expression weldingvoltage Vw, this figure (G) expression arc length La.Below, describe with reference to this figure.
Switching signal Stc shown in this figure (A), is a low level in the low impulse duration LT of predetermined moment t1～t2, is high level among the HT during the high impulse of predetermined moment t2～t3.
Pulse parameter setting signal Ps shown in this figure (B), for low pulse parameter setting value LPs, is high impulse pre-set parameter HPs among the HT during high impulse in low impulse duration LT.Shown in this figure (C),, form by LTp, low peak current LIp during the low peak and low background current LIb though low pulse parameter setting value LPs is not shown.As mentioned above, pulse parameter, be sometimes the combination of peak point current, pulse period and background current or between the peak period, the combination of pulse period and background current.At this moment, in the low pulse period cycle long, high impulse in the cycle cycle lack.
Voltage setting signal Vs shown in this figure (C), is low voltage set value LVs in low impulse duration LT, is high voltage setting value HVs during high impulse among the HT.Here, LVs＜Hvs.These values are further specified in the back.
Give rate setting signal Fs, shown in figure (D), in low impulse duration LT, give speed setting value LFs, during high impulse, give speed setting value HFs for height among the HT for low.The mean value of welding current Iw is big when the speed of giving is fast.Therefore, welding current mean variation among the HT during low impulse duration LT and the high impulse.
Welding current Iw, shown in this figure (E), pulse parameter changes among the HT during low impulse duration LT and high impulse, so waveform changes therewith accordingly.In addition, weldingvoltage Vw is shown in this figure (F), and the variation of its waveform and welding current Iw changes accordingly.And then owing to voltage setting signal Vs changes, so the pulse period also changes.
As mentioned above, among the low impulse duration LT, because for low pulse parameter setting value LPs, so weaken by the caused arc force of peak point current to the molten bath.And then, owing to give speed setting value LFs,, the arc force in molten bath is weakened so welding current mean value diminishes for low.Here, if will set according to the long mode of arc length La at the low low voltage set value LVs that gives speed setting value LFs, the arc force to the molten bath that then should hang down among the impulse duration LT weakens because of distance.
On the other hand, during high impulse among the HT, owing to be high impulse pre-set parameter HPs, so the arc force reinforcement that causes by peak point current to the molten bath.And then,, the arc force in molten bath is strengthened so welding current mean value increases owing to give speed setting value HFs for height.Here, if will set according to the short mode of arc length La at the high voltage setting value HVs that height is given speed setting value HFs, then during this high impulse among the HT to the arc force in molten bath because distance is lacked is reinforced.
Its result, arc length La shown in this figure (G), is high arc length HLa in low impulse duration LT, is low arc length LLa during high impulse among the HT.By arc force is changed sharp, can increase the effect of shaking to the molten bath, improve bubble and reduce effect.But, at this moment, because the diffusion of the arc force during high arc length HLa is not so big, so be difficult to form sharp-pointed ripple weld.Therefore, desiring that bubble is reduced under the king-sized situation of effect, said method is effective.Compare with conventional art, except improving bubble minimizing effect but also under the situation of formation ripple weld, in the figure, the mode setting voltage setting signal Vs longer than the arc length of low impulse duration LT according to arc length among the HT during the high impulse gets final product.Therefore in the present embodiment, set or the mode of lacking is set, all can make this bubble minimizing effect better than conventional art according to the mode long of the arc length among the HT during the high impulse than the arc length among the low impulse duration LT.
Fig. 2 is the block diagram of the source of welding current that is used to implement the pulse arc welding control method of embodiments of the present invention 1.Below, with reference to this figure each functional block is described.
Electric power main circuit PM is input with source power supplies such as three-phase 200V, carries out output controls such as convertor controls according to current error amplifying signal Ei described later, output weldingvoltage Vw and welding current Iw.Welding wire 1 by the thread delivering roller 5 that combines with wire feed motor WM by being fed in the welding gun 4, and mother metal 2 between electric arc 3 takes place.
Voltage detecting circuit VD detects weldingvoltage Vw, voltage sense signal Vd.Average voltage counting circuit VAV calculates the mean value of this voltage detection signal Vd, output voltage average value signal Vav.
Switching signal generative circuit STC output switching signal Stc, this switching signal Stc be low level in during by predetermined low impulse duration setting value LTs defined, during by predetermined high impulse, set value the HTs defined during in be high level.Give speed control circuit FC output and give rate setting signal Fs, this is given rate setting signal Fs and is used for giving welding wire 1 with the predetermined low speed setting value LFs that gives when above-mentioned switching signal Stc is low level (low impulse duration), gives speed setting value HFs with predetermined height and give welding wire 1 when above-mentioned switching signal Stc is high level (low impulse duration).
Voltage setting circuit VS, being that voltage setting signal Vs exports with predetermined low voltage set value LVs when above-mentioned switching signal Stc is low level (low impulse duration), is that voltage setting value Vs exports with predetermined high voltage setting value HVs when high level (during the high impulse).Voltage error amplifying circuit EV amplifies output voltage error amplifying signal Ev to the error between above-mentioned voltage setting signal Vs and the average voltage signal Vav.Voltage/frequency translation circuit VF output pulse-period signal Tf, this pulse-period signal Tf has the corresponding frequency of value with this voltage error amplifying signal Ev.This pulse-period signal Tf is for only the short time is the triggering signal of high level in each pulse period.
Initialization circuit TPS between the peak period, when above-mentioned switching signal Stc is low level (low impulse duration) with setting value LTps during the predetermined low peak as the peak period between setting value Tps output, when high level (during the high impulse) with setting value HTps during the predetermined peak value as the peak period between setting signal Tps output.Timing circuit TP between the peak period, above-mentioned pulse-period signal Tf for high level signal Tp between the time output peak period, between this peak period signal Tp only between by the above-mentioned peak period value of setting signal Tps regulation during in be high level.Be between the peak period when signal Tp is for high level between this peak period, during low level be base value during.
Background current initialization circuit IBS, the background current setting signal Ibs that output is predetermined.In above-mentioned Fig. 1, this background current also changes, but in the figure illustration be not changed to the situation of certain value.Peak point current initialization circuit IPS, when above-mentioned switching signal Stc is low level (low impulse duration), export as peak point current setting signal Ips, when high level (during the high impulse), export as peak point current setting signal Ips with predetermined high peak current setting value HIps with predetermined low peak current setting value LIps.Current settings control circuit ISC, when signal Tp is low level between the above-mentioned peak period, above-mentioned background current setting signal Ibs is exported as current settings control signal Isc, when high level, above-mentioned peak point current setting signal Ips is exported as current settings signal Isc.
Current detection circuit ID detects welding current Iw, output current detection signal Id.Current error amplifying circuit EI amplifies the error between above-mentioned current settings control signal Isc and the current detection signal Id, output current error amplification signal Ei.Carry out the output control of the source of welding current, switch on thus low pulse current group and high impulse set of currents shown in Figure 1 according to this current error amplifying signal Ei.
According to above-mentioned embodiment 1, by synchronously changing voltage setting value, pulse parameter and give speed with switching signal, arc force to the molten bath is changed greatly, therefore the molten bath is shaken acutely, can obtain thus reducing effect, obtain high-quality welding than the better bubble of conventional art.And then so that the arc length when the speed of giving is fast is short, arc length is long when the speed of giving is slow by changing voltage setting value, thereby makes the arc force change bigger.Thus, can further strengthen the effect of shaking in molten bath, improve bubble and reduce effect.
(embodiment 2)
Fig. 3 is the sequential chart of the pulse arc welding control method of expression embodiments of the present invention 2.This figure is corresponding with above-mentioned Fig. 1, and the signal shown in this figure (A)～(G) is identical.Below the part different with Fig. 1 described with reference to this figure.
At moment t1, shown in this figure (A), when switching signal Stc is low level (low impulse duration), same with embodiment 1, shown in this figure (B), pulse parameter setting signal Ps is low pulse parameter setting value LPs, and shown in this figure (C), voltage setting signal Vs is low voltage set value LVs.Its result, shown in this figure (G), arc length La becomes high arc length HLa from low arc length LLa, and t11 converges to stable state from transition state in the moment.The moment t11 that roughly restrains in the transition state of this arc length La gives rate setting signal Fs and becomes the low speed setting value LFs that gives shown in this figure (D).Thus, pulse parameter setting signal Ps, voltage setting signal Vs and give the value that rate setting signal Fs all becomes low impulse duration are weak state to the arc force in molten bath.
At moment t2, switching signal Stc is with above-mentioned same under the situation of high level (during the high impulse).The i.e. moment t21 that roughly restrains in the transition change of arc length La, pulse parameter setting signal Ps, voltage setting signal Vs and give value during rate setting signal Fs all becomes high impulse.Therefore the arc force to the molten bath increases.
In above-mentioned, only make the speed of giving postpone the reasons are as follows of variation during switching.That is, when the switching of moment t1 and t2, make pulse parameter setting signal Ps, voltage setting signal Vs and give rate setting signal Fs when changing simultaneously, there is situation about worsening a little in the arc stability during the transition change of arc length La.In order to improve this situation, the former two (Ps and Vs) is changed in advance, after the transition change of arc length La roughly restrains, remaining one (Fs) changed, can improve arc stability.Here postpone to give rate setting signal Fs during, the transition change that also can judge arc length La is in roughly convergence and sets.This judgement can be carried out according to the variation of the smooth value of weldingvoltage Vw, crest voltage value etc.In addition, measure the transition period of arc length La in advance, can be made as the timing period of setting.
Fig. 4 is the block diagram of the source of welding current that is used to implement the pulse arc welding control method of embodiments of the present invention 2.In the figure, give same label, omit its explanation respectively with above-mentioned Fig. 2 identical functions piece.Below the functional block that dot different with Fig. 2 described.
Give speed delay circuit DLf, judge the moment that the transition change of arc length roughly restrains according to the variation of weldingvoltage Vw, with the change delay of switching signal Stc to this constantly, output first postpones switching signal Sa.First postpone switching signal Sa and change and give rate setting signal Fs according to this.
According to above-mentioned embodiment 2, in the moment that switching signal changes voltage setting value and pulse parameter are changed in advance, the transition change of arc length is deferred to the time changing of roughly convergence and gives speed.Therefore, except the effect of embodiment 1, can improve the arc stability when switching.
(embodiment 3)
Fig. 5 is the sequential chart of the pulse arc welding control method of embodiments of the present invention 3.This figure is corresponding with above-mentioned Fig. 1, and the signal of this figure (A)～(G) expression is identical.Below, the part different with Fig. 1 described with reference to this figure.
At moment t1, same when switching signal Stc is low level (low impulse duration) shown in this figure (A) with embodiment 1, shown in this figure (D), give rate setting signal Fs and be the low speed setting value LFs that gives.Its result, the speed of giving converges to stable state in the moment t12 speed of giving from transition state from giving the suitable velocity variations of speed setting value HFs for giving speed setting value LFs suitable speed with low with height.At the moment t12 that this transition state of giving speed roughly restrains, shown in this figure (B), pulse parameter setting signal Ps becomes low pulse parameter setting value LPs, and shown in this figure (C), voltage setting signal Vs becomes low voltage set value LVs.Pulse parameter setting signal Ps, voltage setting signal Vs and give the value that rate setting signal Fs all becomes low impulse duration thus are in weak state to the arc force in molten bath.
At moment t2, switching signal Stc is also with above-mentioned same under the situation of high level (during the high impulse).The i.e. moment t22 that roughly restrains in the transition change of the speed of giving, pulse parameter setting signal Ps, voltage setting signal Vs and give value during rate setting signal Fs all becomes high impulse.Therefore, increased arc force to the molten bath.
In above-mentioned, the handover delay retarded pulse be the reasons are as follows towards parameter and voltage setting value and variation.Promptly when the switching of moment t1 and t2, make pulse parameter setting signal Ps, voltage setting signal Vs and give rate setting signal Fs when changing simultaneously, the situation that exists the arc stability during the transition change of arc length La to worsen a little.In order to improve this situation, previous (Fs) changed in advance, after the transition change of giving speed roughly restrains, change remaining two (Ps and Vs) again, can improve arc stability thus.Here, timing period can be judged that the transition change of the speed of giving roughly restrains again and sets.This judgement can detect the speed of giving and carry out.In addition, also can measure the transition period of the speed of giving in advance, be set at the timing period of setting.
Fig. 6 is the block diagram that is used to implement the source of welding current of the relevant pulse arc welding control method of embodiments of the present invention 3.Give identical label with above-mentioned Fig. 2 identical functions piece in the figure, omit its explanation.Below to describing with the different functional block that dots of Fig. 2.
Pulse parameter/voltage is set delay circuit DLPV, judges the moment that the transition change of the speed of giving roughly restrains according to the variation of giving speed detection signal Fd, and with the change delay of switching signal Stc to this constantly, output second postpones switching signal Sb.Pulse parameter setting signal Ps and voltage setting signal Vs change according to this second delay switching signal Sb.Give rate setting signal Fs and embodiment 1 is same, Stc synchronously changes with switching signal.
According to above-mentioned embodiment 3, change in the moment that switching signal changes in advance and to give speed, be deferred to the moment that the transition change of the speed of giving roughly restrains voltage setting value and pulse parameter are changed.Thus, except the effect of embodiment 1, can also improve the arc stability when switching.
(embodiment 4)
Fig. 7 is the sequential chart of the relevant pulse arc welding control method of expression embodiments of the present invention 4.This figure is corresponding with above-mentioned Fig. 1, and the signal shown in this figure (A)～(G) is identical.Below, the part different with Fig. 1 described with reference to this figure.
At moment t1, shown in this figure (A), when switching signal Stc is low level (low impulse duration), shown in this figure (D), gives rate setting signal Fs and give speed setting value HFs from height and change to hang down with beginning to have slope and give speed setting value LFs.Its result, the speed of giving changes to low with having slope and gives speed setting value LFs suitable speed from giving the suitable speed of speed setting value HFs with height.In addition, same with embodiment 1 at moment t1, shown in this figure (B), pulse parameter setting signal Ps becomes low pulse parameter setting value LPs, and shown in this figure (C), voltage setting signal Vs becomes low voltage set value LVs.Promptly be, when giving rate setting signal Fs variation, make it have slope with embodiment 1 difference.
At moment t2, shown in this figure (A), when switching signal Stc is high level (during the high impulse), shown in this figure (D), gives rate setting signal Fs and begin to have slope ground and become height and give speed setting value HFs from the low speed setting value LFs that gives.Its result, the speed of giving is from having slope ground and become with height and give speed setting value HFs suitable speed with the low suitable speed of speed setting value LFs of giving.In addition, same with embodiment 1 at moment t2, shown in this figure (B), pulse parameter setting signal Ps becomes high impulse pre-set parameter HPs, and shown in this figure (C), voltage setting signal Vs becomes high voltage setting value HVs.Promptly be, give when rate setting signal Fs changes and make it to have slope with embodiment 1 difference.
In above-mentioned, make it to have the reasons are as follows of slope during the variation of giving rate setting signal Fs.Promptly when giving the vary within wide limits of rate setting signal Fs, when making it to change fast, exist less stress or overshoot to increase steppedly, have the unsettled situation of conditions at the arc this moment.In order to improve this situation, when giving rate setting signal Fs variation, make it to have slope, suppress less stress or overshoot.Therefore, be set in the value that can suppress less stress and overshoot during this inclination.Also can set tilting value (rate of change) in addition replaces setting during the inclination.And then, with synchronous during the inclination of giving rate setting signal Fs, when changing, the voltage setting signal Vs shown in figure (C) also can make it to have slope.
Be used to implement the block diagram of the source of welding current of the pulse arc welding control method of above-mentioned embodiment 4, identical with Fig. 2 except following some.Promptly give speed control circuit FC, when switching signal Stc is low level (low impulse duration) output be used for predetermined low give that speed setting value LFs gives welding wire 1 give rate setting signal Fs, output is used for giving rate setting signal Fs with what predetermined height gave that speed setting value HFs gives welding wire 1 when high level (between high period).And this gives speed control circuit FC, give rate setting signal Fs from the low speed setting value LFs that gives when height is given speed setting value HFs and is changed and give speed setting value HFs from height and make it to have slope when speed setting value LFs changes and change to low giving.
In above-mentioned, based on embodiment 1, the situation that has slope when making the variation of giving rate setting signal Fs describes.In addition, can serve as that the basis makes it to have slope when giving the variation of rate setting signal Fs also with embodiment 2,3.
According to above-mentioned embodiment 4, except the effect of embodiment 1～3, make it to have slope during variation by giving rate setting signal, can suppress the less stress and the overshoot of the speed of giving.Therefore can suppress to follow the instability of less stress and overshoot.
The invention of above-mentioned embodiment 1～4, the pulsed arc that goes for various metals such as aluminium, stainless steel, ferrous materials welds.Particularly in the pulsed arc welding of ferrous materials, in the arc length variations pulse arc welding method of conventional art, there is the sufficient inadequately situation of the effect of shaking in molten bath, requires further to improve bubble and reduce effect.By in the pulsed arc welding of this ferrous materials, being suitable for the present invention, can make the effect of shaking in molten bath enough big, improve bubble and reduce effect.And then the present invention also goes for the alternating-current pulse arc welding.In addition, in embodiment 2,3, timing period is being set under the situation of setting, preferably this value is being become appropriate value according to the kind of the diameter of quality of parent material, welding current mean value, welding wire, protective gas, welding point etc.
Claims (5)
1, a kind of pulse arc welding control method, when giving welding wire, the energising of the background current in during the energising of the peak point current between the peak period and the base value was switched on repeatedly as the pulse period, carry out arc length control according to welding voltage value and voltage setting value mode about equally, it is characterized in that
By above-mentioned voltage setting value being changed periodically arc length is changed periodically with switching signal,
And, and above-mentioned switching signal synchronously makes between the above-mentioned peak period, at least more than one the pulse parameter of above-mentioned peak point current or above-mentioned pulse period changes,
And, synchronously change the speed of giving of welding wire with above-mentioned switching signal.
2, pulse arc welding control method according to claim 1 is characterized in that,
After having begun to postpone during the transition change of above-mentioned arc length roughly restrains from the moment that above-mentioned switching signal changes, the above-mentioned speed of giving changes again.
3, pulse arc welding control method according to claim 1 is characterized in that,
Above-mentioned voltage setting value and above-mentioned pulse parameter change after having begun to postpone during above-mentioned transition change of giving speed roughly restrains from the moment that above-mentioned switching signal changes again.
4, according to each described pulse arc welding control method in the claim 1～3, it is characterized in that,
Set above-mentioned voltage setting value and make the following variation of arc length: according to above-mentioned switching signal change above-mentioned give slow-footed during in arc length longer than the above-mentioned arc length of giving during fireballing.
5, according to each described pulse arc welding control method in the claim 1～4, it is characterized in that,
Make above-mentioned and have slope when giving the variation of speed.
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| JP2007219903 | 2007-08-27 | ||
| JP2007219903 | 2007-08-27 | ||
| JP2007-219903 | 2007-08-27 | ||
| JP2007-295016 | 2007-11-14 | ||
| JP2007295016 | 2007-11-14 | ||
| JP2007295016A JP2009072826A (en) | 2007-08-27 | 2007-11-14 | Control method for pulse arc welding |
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| CN101376191B CN101376191B (en) | 2012-10-31 |
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