CN101758317A - Double-wire welding control method - Google Patents
Double-wire welding control method Download PDFInfo
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- CN101758317A CN101758317A CN200910262267A CN200910262267A CN101758317A CN 101758317 A CN101758317 A CN 101758317A CN 200910262267 A CN200910262267 A CN 200910262267A CN 200910262267 A CN200910262267 A CN 200910262267A CN 101758317 A CN101758317 A CN 101758317A
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Abstract
The invention provides a double-wire welding control method. In the double-wire welding control method, electric arc interrupt due to generation of electric arc deflection is restrained. The double-wire welding control method includes: repeatedly applying a peak voltage and applying a base voltage taken as a cycle between the consumption electrode and the mother plate, applying a welding current to generate electric arc to form a melting bath, and conveying the filler wire to the melting bath for welding, wherein when the electric arc deflexion generation (time t42) in electric arc is determined based on the ascending of the base voltage the ascend, a current is applied in the same direction to the welding current in the filler wire, to eliminate the electric arc deflexion (time t43). In order to apply the current in the same direction in the welding wire and the filler wire, a binding force is acted to the electric arc deflection due to electric arc deflexion, so as to normalize the electric arc deflection.
Description
Technical field
The present invention relates in mariages (wire) welding method, to be used for to suppress the double-wire welding control method of the electric arc labile state that causes by arc blow (magneticarc blow), in this double wire welding method, between sacrificial electrode and mother metal, by applying crest voltage as one-period repeatedly and applying basic voltage, produce electric arc and form the molten bath, and filler wire flowed in the described molten bath weld.
Background technology
(prior art 1) is well-known, has the double wire welding method (with reference to patent documentation 1) of when forming the molten bath producing electric arc between sacrificial electrode (below, be called the welding welding wire) and the mother metal molten bath being carried filler wire and welding now.In this double wire welding method, because in the deposite metal of welding welding wire, add the deposite metal of filler wire, therefore can increase the deposite metal amount, can the welding of high speed, high efficiency ground.Especially, when carrying out high-speed welding by the double wire welding method, in order to prevent to produce the hump shape weld seam, importantly the place of back contacts the molten bath and carries from comparing more with sacrificial electrode electric arc with filler wire.The molten bath is cooled hardly when dissolving in the electric arc of sacrificial electrode because filler wire flowed to, and can not suppress the molten bath by filler wire, so this method does not have the effect of the formation that suppresses the hump shape weld seam.With respect to this, if the rear portion, molten bath of contact filler wire and electric arc periphery and carrying, and the heat in dependence molten bath dissolves, and then the molten bath is cooled, and the molten bath is latter half of is suppressed by filler wire, thereby can suppress the formation of hump shape weld seam.Therefore, in the double wire welding method of prior art, by in filler wire, not feeding electric current, and contact the molten bath and cool off the molten bath with heated state not.
In the double wire welding method, can use as the method that produces electric arc between welding welding wire and the mother metal: multiple consumable electrode type arc-welding process such as carbonic acid gas arc-welding process, metal active gas welding, Metallic Inert Gas welding, pulsed arc welding, alternating current arc welding.In addition, filler wire contacts the molten bath with bringing in before the welding wire basically, and dependence is dissolved by the heat of molten bath generation.Therefore, between filler wire and mother metal, do not produce electric arc.In the present invention, as described consumable electrode type arc-welding process, used the pulsed arc welding.
Figure 12 is the general current/voltage oscillogram for the pulsed arc welding.With the variation in time of figure (A) expression welding current Iw, with the variation in time of figure (B) expression weldingvoltage Vw.Below, describe with reference to same accompanying drawing.
Between the peak period of moment t1～t2 among the Tp, shown in figure (A),, feed the peak point current Ip of the above big current value of critical electric current value in order to move molten drop from the welding welding wire, shown in figure (B), between welding welding wire and mother metal, apply the crest voltage Vp that grows up to ratio with electric arc.
During the basis of moment t2～t3, among the Tb, shown in figure (A),, feed the base current Ib of little current value, shown in figure (B), apply basic voltage Vb in order not form molten drop.With moment t1 till the t3 during as one-period (pulse period Tf), and weld repeatedly.
But,, importantly make electric arc length keep appropriate value in order to carry out good pulsed arc welding.For the control of the output below the electric arc progress row of keeping appropriate value.Electric arc length and the roughly proportional relation of scheming together to dot in (B) of weldingvoltage mean value Vav.Therefore, detect the mean value Vav of weldingvoltage, and, change the output of the welding current mean value Iav that dots of figure (A) together and control by the mode that the weldingvoltage that this detected value equals and suitable electric arc appearance is worked as sets value.When weldingvoltage mean value Vav sets value when big than weldingvoltage and since be in the electric arc strong point in longer than appropriate value, therefore welding current mean value Iav is reduced, and the welding wire melting speed is reduced, electric arc is long to be shortened thereby make.On the other hand, when weldingvoltage mean value Vav than weldingvoltage setting value hour since be in the electric arc strong point in shorter than appropriate value, therefore welding current mean value Iav is increased, and the welding wire melting speed is increased, thereby make electric arc long elongated.As described weldingvoltage mean value Vav, generally use the value of level and smooth weldingvoltage Vw.In addition, as the means that change weldingvoltage mean value Iav, change at least one among Tp, impulse duration Tf, peak point current Ip or the base current Ib between the peak period.
(prior art 2) forms magnetic field by the welding current that feeds mother metal at the electric arc periphery in the consumable electrode type arc welding that comprises pulsed arc welding, electric arc is stressed and be partial to from this magnetic field sometimes.Such state is commonly referred to as arc blow or arc blow.Whether produce arc blow, depend on the mode in the magnetic field that forms by the welding current that feeds mother metal.Therefore, in the pulsed arc welding of the peak point current that feeds big current value,, therefore be easy to generate arc blow owing to form high-intensity magnetic field.As other reason that produces arc blow, the shape of welding point, all cause arc blow easily to the link position of the welding lead of mother metal etc.
The figure of the arcing condition when Figure 13 is expression generation arc blow.Shown in figure (A), between welding welding wire 1 and mother metal, produce common electric arc 3.When producing the arc blow of this state, shown in figure (B), because electric arc 3 is subjected to by the power in magnetic field deflection significantly, thereby electric arc is long elongated.And, big if deflection becomes, then as shown in the figure (C), can not pilot arc, interrupt thereby produce electric arc.In the pulsed arc welding, owing to feed big electric current between the peak period, so the hard straightforward grow of electric arc, even magnetic field force induced effect, electric arc also is partial to hardly.On the other hand, because the little electric current of feeding in during the basis, so a little less than electric arc hard straightforward, magnetic field force induced electric arc is partial to greatly.Therefore, produce arc blow and electric arc interrupts be during the basis in.Interrupt if repeatedly produce the electric arc that causes by arc blow, electric arc generation state then takes place become instability, produce situations such as sputter, weld appearance deterioration in a large number.Therefore, in the pulsed arc welding, the electric arc that the inhibition arc blow causes interrupts obtaining the good welds quality very important.
Figure 14 is the current/voltage oscillogram when producing arc blow in the pulsed arc welding.With the variation in time of figure (A) expression welding current Iw, with the variation in time of figure (B) expression weldingvoltage Vw.Below, describe with reference to same accompanying drawing.
Between the peak period of moment t1～t2 among the Tp, shown in figure (A), feed the peak point current Ip about 400～600A, shown in figure (B), applying grows up with electric arc causes proportional crest voltage Vp.During the later basis of moment t2 among the Tb, shown in figure (A), feed the base current Ib about tens of A, shown in figure (B), applying grows up with electric arc causes proportional crest voltage Vb.
At moment t21, the electric arc deflection if produce arc blow, then as shown in the figure (B), along with the deflection electric arc of electric arc is long elongated, basic voltage Vb rises gradually and becomes big.On the other hand, shown in figure (A),, therefore keep steady state value owing to decide Current Control base current Ib.At moment t3, bigger if the deflection of the electric arc that is caused by arc blow changes, then since electric arc length become very long, therefore can not pilot arc, interrupt thereby produce electric arc.Interrupt if produce electric arc, then as shown in the figure (B), weldingvoltage Vw becomes the floating voltage of output maximum voltage.
The arc blow of prior art 2 reply control method (with reference to patent documentation 2) is: when the climbing of basic voltage Vb reaches the benchmark climbing of predesignating when above, differentiate for producing arc blow, and base current is suddenly increased to more than the 200A, in during this arc blow, when basic voltage Vb reduces, differentiate for eliminating arc blow, and make base current return general value, thereby suppress the control method of the electric arc interruption that causes by arc blow.
The arc blow reply control method (with reference to patent documentation 3) of (prior art 3) prior art 3 is: produce electric arc between electrode and mother metal, and form in the welding method of weld seam at the groove place of mother metal by this electric arc, control arc voltage respectively and be disposed at the place ahead welding wire of described electrode anterior position and the welding wire voltage of the rear welding wire of the rear position that is disposed at described electrode, thereby the electric arc that control is caused by arc blow is partial to the control method of direction.That is, when the arc voltage height, and during the welding wire voltage deviation setting voltage of the place ahead welding wire and rear welding wire, differentiate for producing arc blow, and change the polarity of the place ahead welding wire and the welding wire voltage of rear welding wire, thereby revise the method that electric arc is partial to according to this situation.Described the place ahead welding wire and rear welding wire are not the filler wires that is used to increase the amount of dissolving, but are used to differentiate the means of arc blow, and are to be used for revising the means of electric arc deflection by changing polarity of voltage.
Patent documentation 1: the spy of Japan opens 2006-175458 communique patent documentation 2: the spy of Japan opens 2004-268081 communique patent documentation 3: the spy of Japan opens the 2002-1531 communique
In the double wire welding method described in the prior art 1, when the pulsed arc welding is used as producing the method for electric arc between welding welding wire and the mother metal, as mentioned above, be easy to generate arc blow.Therefore, in order to ensure good welding quality, need carry out countermeasure to arc blow.
When using the method for described prior art 2, there is following problem as this arc blow countermeasure.In the method for prior art 2, when producing arc blow in during the basis, differentiate according to the rising of basic voltage, and revise the deflection of the electric arc that causes by arc blow by the value that increases considerably base current.But, feed owing to the base current value with common tens of A is increased to the above big current value of 200A, so the molten drop mobile status temporarily becomes instability.Its result produces the situation of the part deterioration of weld appearance.
In addition, when using the method for described prior art 3, in welding torch, need to dispose especially the place ahead welding wire and rear welding wire except filler wire, so the welding torch structure complicates as the arc blow countermeasure, expensive thereby price becomes.In addition, because also need the place ahead welding wire and rear welding wire are provided the special power supply of voltage, so price becomes higher.
Summary of the invention
Therefore, in the present invention, purpose is to provide a kind of double-wire welding control method, does not have the unsettled situation of molten drop mobile status in the double wire welding method, do not need to dispose special welding wire at the welding torch place yet, and can suppress arc blow and obtain good welding quality.
In order to solve described problem, first invention provides a kind of double-wire welding control method, between sacrificial electrode and mother metal, by applying crest voltage as one-period repeatedly and applying basic voltage, feeding welding current produces electric arc and forms the molten bath, and filler wire is flowed to described molten bath to be welded, it is characterized in that, rising differentiation according to described basic voltage produces arc blow in described electric arc, when determining the described arc blow of generation, by feeding and the unidirectional electric current of described welding current in described filler wire, thereby eliminate arc blow.
Second invention is for inventing described double-wire welding control method according to first, it is characterized in that, from determine produce described arc blow the time be carved into decline according to described basic voltage determine eliminate arc blow during in, described filler wire is fed electric current.
The 3rd invention is characterized in that according to the described double-wire welding control method of first invention, from determining the moment that produces described arc blow, in specified time limit described filler wire is fed electric current.
The 4th invention is characterized in that according to the described double-wire welding control method of first invention, from determine produce described arc blow the time be carved into till moment of the described crest voltage that begins to apply next cycle during, described filler wire is fed electric current.
The 5th invention is characterized in that according to any described double-wire welding control method of first～the 4th invention electric current that feeds has the slope that its value increases along with effluxion in described filler wire.
The 6th invention is according to any described double-wire welding control method of first～the 5th invention, it is characterized in that, in described filler wire, feed electric current during in, the transporting velocity of described filler wire is set as faster than the transporting velocity that does not feed in the described filler wire during the electric current.
The 7th invention is characterized in that according to any described double-wire welding control method of first～the 5th invention, and the current value that feeds in the corresponding described filler wire changes the transporting velocity of described filler wire.
According to described first and second invention, differentiate the generation of arc blow by the rising of basic voltage value.During the generation of differentiating this arc blow, feed electric current in the filler wire, thereby the deflection of the electric arc that will be caused by arc blow is returned original normal condition.Therefore, even thereby producing arc blow can not reach the situation that electric arc interrupts causing failure welding yet.And, keep general value owing to feed the base current of welding welding wire, thereby therefore do not exist the molten drop mobile status to become the situation that the instability weld appearance worsens.And welding torch also can use common welding torch, does not need to dispose special arc blow reply welding wire.
According to described the 3rd invention, from the rising by the basic voltage value determine arc blow generation the time be carved into specified time limit, feed electric current in the filler wire, thereby the deflection of the electric arc that will be caused by arc blow is returned original normal condition.In view of the above, can obtain and the identical effect of first invention.And, in the 3rd invention,, therefore can stablize and carry out arc blow reply control owing to do not need to carry out causing by welding condition sometimes the differentiation of the elimination of the arc blow that can not correctly differentiate.In addition, because as long as differentiate the generation of arc blow, so the differentiation means become simple.
According to described the 4th invention, when the rising by the basic voltage value determines the generation of arc blow, be carved into till the crest voltage that applies following one-period during, feed electric current in the filler wire, thereby the deflection of the electric arc that will be caused by arc blow is returned original normal condition.In view of the above, can obtain and the identical effect of first invention.And, in the 4th invention,,, also carry out the feeding of filler wire electric current continuously until feed till the peak point current even temporarily eliminate arc blow by the feeding of filler wire electric current, therefore can prevent the generation of arc blow once more.
According to described the 5th invention, except effect,, can prevent to eliminate contacting and can not feed the situation of electric current between filler wire and the molten bath also by making the filler wire electric current have slope with first～the 4th invention.
According to the described the 6th and the 7th invention, except effect, also obtain following effect with first～the 5th invention.That is,, can make the melting speed of filler wire and transporting velocity balance all the time by the transporting velocity of the filler wire in accelerating in filler wire, to feed during the electric current.Therefore, the front end that can the suppress filler wire front end that breaks away from molten bath or filler wire injects the labile state in molten bath.
Description of drawings
Fig. 1 is the current/voltage oscillogram of the double-wire welding control method of expression embodiments of the present invention 1.Fig. 2 is illustrated in the schematic diagram for the situation of the electric arc generating unit of (t41～t43 during) constantly during the arc blow reply shown in Fig. 1.Fig. 3 is the block diagram of the double wire welding device of embodiments of the present invention 1.Fig. 4 is the current/voltage oscillogram of the double-wire welding control method of expression embodiments of the present invention 2.Fig. 5 is the block diagram of the double wire welding device of embodiments of the present invention 2.Fig. 6 is the current/voltage oscillogram of the double-wire welding control method of expression embodiments of the present invention 3.Fig. 7 is the block diagram of the double wire welding device of embodiments of the present invention 3.Fig. 8 is the current/voltage oscillogram of the double-wire welding control method of expression embodiments of the present invention 4.Fig. 9 is the block diagram of the double wire welding device of embodiments of the present invention 4.Figure 10 is the current/voltage oscillogram of the double-wire welding control method of expression embodiments of the present invention 5.Figure 11 is the block diagram of the double wire welding device of embodiments of the present invention 5.Figure 12 is for the current/voltage oscillogram of pulsed arc welding in the prior art.Figure 13 is the figure of the conditions at the arc when having produced arc blow in the expression prior art.Figure 14 be in the prior art for the pulsed arc welding produce arc blow the time the current/voltage oscillogram.Among the figure: 1-welds welding wire, the 2-mother metal, the 2a-molten bath, 3-electric arc, the 4-welding torch, 5-welds welding wire conveying roller (roll), the 6-filler wire, 7-filler wire welding torch, 8-filler wire conveying roller, a-(transporting velocity increases function) constant, AB-arc blow judging circuit, Ab-arc blow judgment signal, the AB2-second arc blow judging circuit, the DV-drive circuit, Dv-drives signal, EI-current error amplifying circuit, Ei-current error amplifying signal, EV-voltage error amplifying circuit, Ev-voltage error amplifying signal, the FC-filler wire is carried control circuit, the Fc-filler wire is carried control signal, the FM-filler wire is carried motor, FP-filler wire power supply, the FP2-second filler wire power supply, FP3-the 3rd filler wire power supply, FR-filler wire transporting velocity initialization circuit, Fr-filler wire transporting velocity setting signal, FRA-filler wire transporting velocity add circuit, Fra-filler wire transporting velocity additive signal, Fw-filler wire transporting velocity, Iav-welding current mean value, the Ib-base current, IBR-base current initialization circuit, Ibr-base current setting signal, the Ic-steady state value, IFD-filler wire current detection circuit, Ifd-filler wire current detection signal, the ID-current detection circuit, Id-welding current detection signal, If-filler wire electric current, IFR-filler wire current setting circuit, Ifr-filler wire current settings signal, the IFR2-second filler wire current setting circuit, Ip-peak point current, IPR-peak point current initialization circuit, Ipr-peak point current setting signal, IR-current setting circuit, Ir-welding current setting signal, the Is-initial value, the Iw-welding current, the RM-electric power main circuit is during the Tb-basis, during the Td-energising, initialization circuit during the TDR-energising, setting signal during the Tdr-energising, Tf-pulse period (signal), TP-timing circuit between the peak period, Tp-is (signal) between the peak period, TPR-initialization circuit between the peak period, Tpr-setting signal between the peak period, VAV-voltage smoothing circuit, Vav-weldingvoltage mean value (signal), Vb-basic voltage, VD-voltage detecting circuit, Vd-weldingvoltage detection signal, VF-voltage/frequency change-over circuit, Vp-crest voltage, VR-voltage setting circuit, Vr-weldingvoltage setting signal, the Vt-reference voltage value, Vt1-first reference voltage value, Vt2-second reference voltage value, the Vw-weldingvoltage, WC-welding welding wire is carried control circuit, and Wc-welding welding wire is carried control signal, and WM-welding welding wire is carried motor, WR-welding welding wire transporting velocity initialization circuit, Wr-welding welding wire transporting velocity setting signal, the value added of Δ Fw-transporting velocity
The specific embodiment
Below, with reference to accompanying drawing, embodiments of the present invention are described.
(embodiment 1) Fig. 1 is the current/voltage oscillogram of the double-wire welding control method of expression embodiments of the present invention 1.With the variation in time of figure (A) expression welding current Iw,, feed the electric current I f of filler wire with figure (C) expression with the variation in time of figure (B) expression weldingvoltage Vw.In with figure, in the pulse period of t1～t3 constantly, when expression does not produce the stable welded condition of arc blow, in the pulse period of the moment t3～t5 that follows, when expression has produced the welded condition of arc blow.Below, with reference to same accompanying drawing, the arc blow countermeasure of present embodiment is described.
Owing in the pulse period of moment t1～t3, do not produce arc blow, therefore be in stable welded condition.Between the peak period of moment t1～t2, among the Tp, shown in figure (A), feed peak point current Ip, shown in figure (B), apply crest voltage Vp.During the basis of moment t2～t3, among the Tb, shown in figure (A), feed base current Ib, shown in figure (B), apply basic voltage Vb.During this moment t1～t3, shown in figure (C), do not feed filler wire electric current I f.
Between the peak period of moment t3～t4, among the Tp, shown in figure (A), feed peak point current Ip, shown in figure (B), apply crest voltage Vp.Tb during the moment t4 basis shown in figure (A), feeds base current Ib, shown in figure (B), applies the basic voltage Vb of general value.Moment t41 during this basis among the Tb, the electric arc deflection owing to produce arc blow, so electric arc is long elongated, shown in figure (B), basic voltage Vb rises and uprises.And at moment t42, the value of basic voltage value Vb becomes more than the described reference voltage value Vt that predesignates that dots.Become described reference voltage value Vt when above when differentiating basic voltage value Vb, shown in figure (C), the feeding of beginning filler wire electric current I f.During moment t42～t43, basic voltage Vb becomes more than the described reference voltage value Vt.In this period, shown in figure (C), feed filler wire electric current I f.On the other hand, during the basis of moment t4 in, shown in figure (A), the value of base current Ib is constant.
During moment t42～t43, feed base current Ib in the welding welding wire, also feed electric current I f in the filler wire.Because the feeding direction of two electric currents is identical, so active force attracts each other, and to being caused this adhesion of arcing of deflection by arc blow, and revises deflection.Therefore, shown in figure (B), at moment t43, basic voltage value Vb becomes and does not reach described reference voltage V t, reduces turning back to general value then rapidly.Therefore, arc blow produces constantly at t41, is eliminated constantly at t43.At moment t43, shown in figure (C), stop the feeding of filler wire electric current I f.During the remaining basis of moment t43～t5, among the Tb, shown in figure (A), feed base current Ib, shown in figure (B), apply the voltage Vb of general value.Because electric arc does not during this period produce arc blow, therefore be in stable status.
In described, reference voltage value Vt considers not produce the change of the basic voltage value Vb in the state of arc blow, sets appropriate value according to welding condition.For example, because the change of basic voltage Vb does not reach crest voltage value Vp, therefore reference voltage value Vt is set near the value the crest voltage value VP.In addition, in the comparison of basic voltage Vb and reference voltage value Vt, also can have hysteresis (hysteresis).That is, a reference value of basic voltage Vb when general value rises is made as the first reference voltage value Vt1, in case a reference value that basic voltage Vb surpasses Vt1 when beginning to descend after above is made as the second reference voltage value Vt2.At this moment, Vt1＞Vt2.In addition, the situation that also can reach a reference value according to the climbing of basic voltage Vb is differentiated the generation of arc blow, and then reaches the elimination of the situation differentiation arc blow of a reference value according to the rate of descent of basic voltage Vb.The method of discrimination that the multiple arc blow based on basic voltage Vb that can use in the past to be carried out produces.
The value of filler wire electric current I f can be revised the electric arc deflection that is caused by arc blow, and is set at appropriate value according to welding condition in following value, thereby this value is not dissolved the value of the contact condition of disrumpent feelings elimination filler wire and mother metal for not making filler wire.For example, for about 100A, even also do not produce electric arc for the front end of filler wire breaks away from from the molten bath, then the floating voltage value that filler wire and mother metal are applied is made as little value.
Fig. 2 be illustrated in the arc blow reply shown in Fig. 1 during the schematic diagram of situation of electric arc generating unit of (t41～t43 during) constantly.With figure (A) is situation before t41, and figure (B) is in t42 situation constantly, with figure (C) be t42 constantly with t43 in the middle of constantly situation.Below, describe with reference to same accompanying drawing.
The situation of the electric arc when not producing arc blow with figure (A) expression.To welding, welding welding wire 1 is in position the preceding, and produces electric arc 3 between the mother metal 2 at left.Form molten bath 2a by this electric arc 3.Position after filler wire 6 is in, by not directly the mode of contact arc 3 contact with the rear position of molten bath 2a, and carry.Electric arc 3 is created in the throughput direction of welding welding wire 1, is not partial to.
The situation of the electric arc when producing arc blow with figure (B) expression.Owing to produce arc blow, thus electric arc 3 with the incoherent the place ahead of throughput direction direction of welding welding wire 1 on produce very big deflection, electric arc is long elongated.
Arcing condition when feeding filler wire electric current I f in order to tackle arc blow with figure (C) expression.In welding welding wire 1, feed base current Ib, in filler wire 6, feed unidirectional filler wire electric current I f.Therefore, electric arc 3 is subjected to the effect of filler wire 6 side adhesions, thereby electric arc 3 is near the throughput direction of welding welding wire 1.So, can make the deflection of the electric arc that causes by arc blow return normal condition.
Fig. 3 is the block diagram of welder that is used to implement the double-wire welding control method of described embodiment of the present invention 1.Below, with reference to same accompanying drawing each block diagram is described.
Electric power main circuit PM as input, and along with described driving signal Dv in the back, exports control by convertor controls with the source power supply of three-phase 200V etc., and output is used to produce the weldingvoltage Vw and the welding current Iw of electric arc 3.This electric power main circuit PM is by constituting with the lower part: a rectification circuit of the commercial voltage of rectification, level and smooth by the capacitor of the direct current of rectification, smoothed direct current is converted to the converter circuit of high-frequency ac, the high-frequency ac step-down is become to be suitable for to produce the high frequency transformer of the magnitude of voltage of electric arc 3 usefulness, to carried out the secondary rectification circuit of rectification by the high-frequency ac of step-down, to being carried out level and smooth reactor (reactor) by the direct current of rectification, omit its diagram.
The welding welding wire transporting velocity setting signal Wr that welding welding wire transporting velocity initialization circuit WR output is predesignated.The welding welding wire is carried the transporting velocity of control circuit WC with the value that is equivalent to described welding welding wire transporting velocity setting signal Wr, will be used to carry the welding welding wire of welding welding wire 1 to carry control signal Wc to export to described welding welding wire and carry motor WM.The filler wire transporting velocity setting signal Fr that filler wire transporting velocity initialization circuit FR output is predesignated.Filler wire is carried the transporting velocity of control circuit FC with the value that is equivalent to described filler wire transporting velocity setting signal Fr, will be used to carry the filler wire of filler wire 6 to carry control signal Fc to export to described filler wire and carry motor FM.
Voltage detecting circuit VD detects described weldingvoltage Vw, output weldingvoltage detection signal Vd.Voltage smoothing circuit VAV as input, carries out level and smooth (equalization) with this weldingvoltage detection signal Vd, thus output weldingvoltage average value signal Vav.The weldingvoltage setting signal Vr that voltage setting circuit VR output is predesignated.Voltage error amplifying circuit EV amplifies the error between described weldingvoltage setting signal Vr and the described weldingvoltage average value signal Vav, and output voltage error amplifying signal Ev.
Voltage/frequency change-over circuit VF converts the proportional frequency signal of value with described voltage error amplifying signal Ev to, the pulse-period signal Tf of corresponding each this frequency (pulse period) output short time high voltage level.Setting signal Tpr between the peak period that initialization circuit TPR output is predesignated between the peak period.Between the peak period timing circuit TP with described pulse-period signal Tf and between the described peak period setting signal Tpr as input, only by become from pulse-period signal Tf high level the time be carved into according to signal Tp between the peak period of output high level in during the setting signal Tpr decision between the peak period.Therefore, between this peak period signal Tp be its cycle become the pulse period, become high level between the peak period and during the basis in become low level signal.
The peak point current setting signal Ipr that peak point current initialization circuit IPR output is predesignated.The base current setting signal Tbr that base current initialization circuit IBR output is predesignated.Current setting circuit IR with signal Tp, described peak point current setting signal Ipr and base current setting signal Ibr between the described peak period as input, signal Tp is that high level is when (between the peak period) between the peak period, peak point current setting signal Ipr is exported as welding current setting signal Ir, when low level (during the basis), base current setting signal Ibr is exported as welding current setting signal Ir.Current detecting electric current I D detects described welding current Iw, output welding current detection signal Id.Current error amplifying circuit EI amplifies the error between described welding current setting signal Ir and the described welding current detection signal Id, output current error amplification signal Ei.Drive circuit DV imports this current error amplifying signal Ei, and carries out pulse width modulation control according to this signal, and is used to drive the driving signal Dv of the converter circuit in the described electric power main circuit PM according to its result's output.
Arc blow judging circuit AB with described weldingvoltage detection signal Vd and between the described peak period signal Tp as input, output arc blow judgment signal Ab, value as weldingvoltage detection signal Vd (basic voltage) when this arc blow judgment signal Ab signal Tp between the peak period is low level (during the basis) is set to high level when the reference voltage value of predesignating is above, be set to low level afterwards when the value of weldingvoltage detection signal Vd does not reach the reference voltage value of predesignating.Therefore, this arc blow judgment signal Ab produce arc blow during in be the signal of high level.The filler wire current settings signal Ifr that filler wire current setting circuit IFR output is predesignated.Described filler wire with power supply FP with described arc blow judgment signal Ab and described filler wire setting signal Ifr as input, arc blow judgment signal Ab be high level (generation arc blow) during in, feed the filler wire electric current I f suitable with filler wire current settings signal Ifr.Therefore, this filler wire is to have the power supply of deciding current characteristics or droop characteristic (drooping characteristic) with power supply FP.
According to described embodiment 1, differentiate the generation of arc blow by the rising of basic voltage value, differentiate the elimination of arc blow then by the decline of basic voltage value.And, during the generation of differentiating this arc blow in, feed electric current in the filler wire, and the deflection of the electric arc that will be caused by arc blow is returned original normal condition.In view of the above, can not cause electric arc to interrupt yet, thereby become the situation of failure welding even produce arc blow.And, be always general value owing to feed the base current of welding welding wire, therefore do not exist the molten drop mobile status to become the situation of instability, weld appearance deterioration.And welding torch can use common welding torch, does not need to dispose special arc blow reply welding wire.In addition, in order to eliminate arc blow,, therefore can not lose the cooling effect in described molten bath just filler wire electric current I f feeds in only during a part.
(embodiment 2) embodiment 2 has following difference with described embodiment 1.That is, in embodiment 1, when differentiating the generation of arc blow, begin to feed filler wire electric current I f according to the rising of basic voltage Vb.This operates in the embodiment 2 too.And, in embodiment 1, when differentiating the elimination of arc blow, stop the feeding of filler wire electric current I f according to the decline of basic voltage Vb.With respect to this, in embodiment 2, begin only in specified time limit, just to feed filler wire electric current I f from the generation of differentiating arc blow.Below, with reference to accompanying drawing embodiment 2 is described.
Fig. 4 is the oscillogram of current/voltage of the double-wire welding control method of expression embodiments of the present invention 2.With the time variation of figure (A) expression welding current Iw, the time of figure (B) expression weldingvoltage Vw changes together, schemes the electric current I f that (C) expression feeds filler wire together.Same accompanying drawing is corresponding to described Fig. 1, and the description before moment t4 is identical with Fig. 1, has therefore omitted this part.In addition, identical with Fig. 1, expression does not produce in the stable welded condition of arc blow in the pulse period of the moment t1～t3 in same accompanying drawing, when expression has produced the welded condition of arc blow in the pulse period of the moment t3～t5 that follows.Below, describe with reference to the arc blow countermeasure of same accompanying drawing present embodiment.
Tb during the moment t4 basis shown in figure (A), feeds base current Ib, shown in figure (B), applies the basic voltage Vb of general value.Since the moment t41 among the Tb during this basis, thus arc blow electric arc deflection produced, so electric arc is long elongated, and shown in figure (B), basic voltage Vb rises and uprises.Then, at moment t42, the value of basic voltage value Vb becomes more than the reference voltage value Vt that predesignates that dots.When differentiating basic voltage value Vb is described reference voltage value Vt when above, shown in figure (C), and the feeding of beginning filler wire electric current I f.During moment t42～t43, basic voltage value Vb becomes more than the described reference voltage value Vt.In this period, shown in figure (C), feed filler wire electric current I f.On the other hand, during the basis of moment t4, shown in figure (A), the value of base current Ib is constant.
During moment t42～t43, in the welding welding wire, feed base current Ib, and in filler wire, also feed electric current I f.Because the feeding direction of two electric currents is identical, so active force mutually combines, and to causing this adhesion of arcing of deflection by arc blow, thereby the deflection of correction.Therefore, shown in figure (B), at moment t43, basic voltage value Vb becomes and does not reach described reference voltage value Vt, reduces turning back to general value afterwards rapidly.Therefore, arc blow produces at moment t41, and is eliminated after moment t43.But, after moment t43, shown in figure (C), also continue to feed filler wire electric current I f.Then, shown in figure (C), the moment t44 of Td during the differentiation that produces from arc blow (t42 is constantly) energising of predesignating of process constantly, filler wire electric current I f stops to feed.During the remaining basis of moment t44～t5, among the Tb, shown in figure (A), feed base current Ib, shown in figure (B), apply the basic voltage value Vb of general value.Owing to do not produce arc blow at electric arc during this period, therefore be in stable status.
In described, Td is set at the time longer than the following time during the energising: weld test, when having fed filler wire electric current I f, measure the time (time of t42～t43 constantly) when arc blow is eliminated, and, consider average time and deviate and eliminate arc blow according to this measurement result.That sets like this reasons are as follows.That is, can carry out differentiation that arc blow is produced accurately according to the rising of basic voltage Vb.But the differentiation of the elimination of arc blow produces the situation that is caused the precision deterioration by welding condition.Therefore, in the present embodiment, do not need to differentiate the elimination of arc blow.For the method for discrimination of the generation of arc blow, identical with embodiment 1.In addition, the value of filler wire electric current I f is also identical with embodiment 1.In addition, the schematic diagram of the electric arc generating unit in the arc blow reply is also identical with described Fig. 2.
Fig. 5 is the block diagram of welder that is used to implement the double-wire welding control method of described embodiments of the present invention 2.In with figure, the block diagram identical identical symbol of having got the bid with described Fig. 3, and omit its explanation.Below, with reference to same accompanying drawing, the block diagram that dot different with Fig. 3 described.
The second arc blow judging circuit AB2 with weldingvoltage detection signal Vd and between the peak period signal Tp as input, and when peak signal Tp was low level (during the basis), the value of weldingvoltage detection signal Vd was exported the arc blow judgment signal Ab of short time high level when the reference voltage value of predesignating is above.Setting signal Tdr during the energising that initialization circuit TDR output is predesignated during the energising.Setting signal Tdr was as input during second filler wire used power supply FP2 with described arc blow judgment signal Ab, filler wire current settings signal Ifr and described energising, and become moment of high level from arc blow judgment signal Ab, in during setting signal Tdr determines during according to energising, feed the filler wire electric current I f suitable with filler wire current settings signal Ifr.
According to described embodiment 2, the generation that determines arc blow from the rising by the basic voltage value during specified time limit, feeds electric current constantly in the filler wire, thereby the deflection of the electric arc that will be caused by arc blow is returned original normal condition.In view of the above, can obtain the effect identical with embodiment 1.And, in the present embodiment and since do not need to carry out sometimes by welding condition cause can not correct decision the differentiation eliminated of arc blow, therefore can stablize and carry out arc blow reply control.In addition, because as long as differentiate the generation of arc blow, so judging circuit becomes simple.
(embodiment 3) embodiment 3 has following difference with described embodiment 1 and 2.That is, in embodiment 1 and 2, when differentiating the generation of arc blow by the rising of basic voltage Vb, the feeding of beginning filler wire electric current I f.This operates in the embodiment 3 also identical.And, in embodiment 1, when differentiating the elimination of arc blow, stop the feeding of filler wire electric current I f by the decline of basic voltage Vb.In addition, in embodiment 2,,, stop the feeding of filler wire electric current I f through after specified time limit from the moment of the generation that determines arc blow.With respect to this, in embodiment 3, from the generation of differentiating arc blow to the crest voltage Vp (feeding of peak point current Ip) that the welding welding wire is begun to apply next cycle during, feed and fill electric current I f.Below, with reference to accompanying drawing embodiment 3 is described.
Fig. 6 is the current/voltage oscillogram of the double-wire welding control method of expression embodiments of the present invention 3.With the time variation of figure (A) expression welding current Iw, the time of figure (B) expression weldingvoltage Vw changes together, schemes the electric current I f that (C) expression feeds filler wire together.Same accompanying drawing is corresponding to described Fig. 1 and Fig. 4, owing to until the explanation till the moment t4 is identical, therefore omitted this part.In addition, as Fig. 1, in the pulse period of the moment t1～t3 in same accompanying drawing, when expression does not produce the stable welded condition of arc blow, in the pulse period of the moment t3～t5 that follows, when expression has produced the welded condition of arc blow.Below, with reference to same accompanying drawing, the arc blow countermeasure in the present embodiment is described.
Tb during the moment t4 basis shown in figure (A), feeds base current Ib, shown in figure (B), applies the basic voltage Vb of general value.Moment t41 during this basis among the Tb, the electric arc deflection owing to produce arc blow, so electric arc is long elongated, shown in figure (B), basic voltage Vb rises and uprises.And at moment t42, the value of basic voltage value Vb becomes more than the reference voltage value Vt that predesignates that dots.When differentiating basic voltage value Vb when described reference voltage value Vt is above, shown in figure (C), begin to carry out the feeding of filler wire electric current I f.During moment t42～t43, basic voltage value Vb becomes more than the reference voltage value Vt.In this period, shown in figure (C), feed filler wire electric current I f.On the other hand, in during the basis of moment t4, shown in figure (A), the value of base current Ib does not change.
During moment t42～t43, the welding welding wire is fed base current Ib, in filler wire, also feed electric current I f.Because the feeding direction of two electric currents is identical, therefore produce the effect of the power that mutually combines, to cause this adhesion of arcing of deflection by arc blow, be partial to thereby revise.Therefore, shown in figure (B), at moment t43, basic voltage value Vb becomes and does not reach reference voltage value Vt, reduces turning back to general value afterwards rapidly.Therefore, arc blow produces constantly at t41, is eliminated constantly at t43.But, after the moment, shown in figure (C), also continue to feed filler wire electric current I f at t43.Then, shown in figure (C), filler wire electric current I f shown in figure (A), stops to feed at feeding peak point current Ip moment t54.Therefore, shown in figure (C), filler wire electric current I f feeds during the moment (t42 constantly) to moment that feeds peak point current Ip (moment t5) of determining arc blow and producing.
By the described reason of setting the feeding timing of filling electric current I p is as follows.That is, as shown in same accompanying drawing, at moment t43, even because arc blow temporarily is eliminated the situation that produces other arc blow that also exists of also I'm afraid, therefore until till the feeding peak point current Ip, feed and fill electric current I f.When feeding peak point current Ip, as mentioned above, straightforward firmly by the electric arc that produced by big current value becomes the normal state that does not produce arc blow.Therefore, from producing arc blow at short notice,, also, eliminate arc blow by the feeding of this peak point current Ip even reach the feeding timing of peak point current Ip.Like this, for the method for discrimination that arc blow produces, identical with embodiment 1.In addition, the value of filling electric current I f is also identical with embodiment 1.In addition, the schematic diagram of the electric arc generating unit in the arc blow reply is also identical with described Fig. 2.
Fig. 7 is the block diagram of welder that is used to implement the double-wire welding control method of described embodiments of the present invention 3.In same accompanying drawing, the block diagram identical identical symbol of having got the bid with described Fig. 5, and omitted its explanation.Same accompanying drawing has deleted initialization circuit TDR during the energising of Fig. 5, and the 3rd filler wire that is represented by dotted lines has replaced second filler wire power supply FP2 of Fig. 5 with power supply FP3.Below, with reference to same accompanying drawing the block diagram that dots is described.
The 3rd filler wire with power supply FP3 with arc blow judgment signal Ab, filler wire current settings signal And if between the peak period signal Ip as input, and become from arc blow judgment signal Ab high level the time till being carved into peak signal Tp to become high level (between the peak period) during, feed the filler wire electric current I f suitable with filler wire setting signal Ifr.
According to described embodiment 3, from the rising by the basic voltage value determine that arc blow produces the time be carved into till the peak point current that feeds next cycle during, feed electric current in the filler wire, thereby will return original normal condition by the electric arc deflection that arc blow causes.In view of the above, can obtain the effect identical with embodiment 1.And, in the present embodiment,,, also continue the feeding of filler wire electric current until feed till the peak point current even temporarily be eliminated by the feeding arc blow of filler wire electric current, therefore can prevent to produce once more arc blow.
(embodiment 4) embodiment 4 has following difference with described enforcement situation 1～3.That is, in embodiment 1～3, filler wire If is fed as steady state value.With respect to this, in embodiment 4, the value of filler wire electric current I f has along with effluxion the slope that increases gradually.Below, with reference to accompanying drawing embodiment 4 is described.
Fig. 8 is the current/voltage oscillogram of the double-wire welding control method of expression embodiments of the present invention 4.With the time variation of figure (A) expression welding current Iw, the time of figure (B) expression weldingvoltage Vw changes together, schemes the electric current I f that (C) expression feeds filler wire together.Same accompanying drawing is corresponding to described Fig. 1, and the filler wire electric current I f of expression only has the local different of slope in figure (C).Below, with reference to FIG. this difference is described.
Filler wire electric current I f as shown in the figure (C) when differentiating the generation of arc blow, feed the initial value Is that predesignates, the slope increase to predesignate becomes steady state value after reaching steady state value Ic afterwards.Slope can be a straight line, also curve.Initial value Is can be zero.Make filler wire electric current I f have the reasons are as follows of slope.That is, f is more little for the filler wire electric current I, and then the filler wire possibility locating to dissolve beyond the front end is just low more.Because when filler wire was located to dissolve beyond front end, elimination was in Light Condition with contacting of molten bath, did not therefore feed electric current.In order to prevent to produce this state, slope is set.
Fig. 9 is the block diagram of welder that is used to implement the double-wire welding control method of described embodiments of the present invention 4.In same accompanying drawing, the block diagram identical identical symbol of having got the bid with described Fig. 3, and omitted its explanation.The second filler wire current setting circuit IFR2 that same accompanying drawing is represented by dotted lines has replaced the filler wire current setting circuit IFR of Fig. 3.Below, with reference to same accompanying drawing this block diagram that dots is described.
The second filler wire current settings electric current I FR2 with arc blow judgment signal Ab as input, and become the initial value Is that predesignates in the moment that this arc blow judgment signal Ab becomes high level, increase with the slope of predesignating afterwards, when reaching the steady state value Ic that predesignates, output becomes the filler wire current settings signal Ifr of steady state value.
In described, the situation based on embodiment 1 has been described, also identical based on the situation of embodiment 2 and 3.That is, can replace the filler wire initialization circuit IFR of the Fig. 5 in the embodiment 2 with the described second filler wire current setting circuit IFR2, and the filler wire current setting circuit IFR of the Fig. 7 in the embodiment 3.
According to described embodiment 4, except effect,, can prevent that contacting between filler wire and the molten bath is eliminated and can not feeds the situation of electric current also by making the filler wire electric current have slope with embodiment 1～3.
(embodiment 5) embodiment 5 has following difference with described enforcement situation 1～4.That is, in embodiment 1～4, the transporting velocity of filler wire is a steady state value.With respect to this, in embodiment 5, feed filler wire electric current I f during in, the transporting velocity of filler wire is set as faster than the speed that does not feed during the filler wire electric current I f.Below, with reference to accompanying drawing embodiment 5 is described.
Figure 10 is the current/voltage oscillogram of the double-wire welding control method of expression embodiments of the present invention 5.With scheming the time variation that (A) represents welding current Iw, figure (B) represents the time variation of weldingvoltage Vw together, schemes the electric current I f of (C) expression feeding filler wire together, schemes the transporting velocity Fw that (D) represents filler wire together.Same accompanying drawing is corresponding to described Fig. 1, and is identical with figure (A)～(C), and its difference is the oscillogram of having appended the filler wire transporting velocity Fw of expression among the figure (D).Below, with reference to same accompanying drawing this difference is described.
Shown in figure (D), filler wire transporting velocity Fw becomes setting when not feeding as the filler wire electric current I f shown in the figure (C), become faster than setting when feeding filler wire electric current I f.That is, during moment t42～t43 in owing to feed filler wire electric current I f, therefore filler wire transporting velocity Fw during this period is than fast during other.The value added of transporting velocity is set according to the value of filler wire electric current I f.For example, the value added with transporting velocity is made as Δ Fw=aIf.Wherein, a is a constant.The transporting velocity of filler wire is set as faster the reasons are as follows.That is, filler wire transporting velocity Fw is set at setting as mentioned above, and the heat that this setting sends with the molten bath under the state that does not feed electric current dissolves front end.When the transporting velocity Fw of filler wire is slower than melting speed, preceding end burning, front end breaks away from from the molten bath, thereby can not reach stable welded condition.On the other hand, when the transporting velocity Fw of filler wire was faster than melting speed, filler wire was in the state that is inserted in the molten bath, and welded condition is also unstable.Therefore, for carrying out stable welding, the transporting velocity Fw of balance melting speed and filler wire is of crucial importance.For the arc blow countermeasure, when feeding filler wire electric current I f, melting speed accelerates, and the balance between the filler wire transporting velocity Fw is destroyed.When the value of filler wire electric current I f hour or during the energising more in short-term, this imbalance less becomes problem.But when long, this imbalance just becomes problem when the value of filler wire electric current I f is big or during the energising.Under these circumstances, by accelerating filler wire transporting velocity Fw, the balance between acquisition and the melting speed.
Figure 11 is the block diagram of welder that is used to implement the double-wire welding control method of embodiments of the present invention 5.In same accompanying drawing, the block diagram identical identical symbol of having got the bid with described Fig. 3, and omitted its explanation.Same accompanying drawing is to have appended the filler wire transporting velocity add circuit FRA that filler wire current detection circuit IFD that dotted line represents and dotted line are represented in Fig. 3.Below, with reference to same accompanying drawing this block diagram that dots is described.
Filler wire current detection circuit IFD detects filler wire electric current I f, and weldering current detection signal Ifd is filled in output.Filler wire transporting velocity add circuit FRA with filler wire transporting velocity setting signal Fr and described filler wire current detection signal Ifd as input, and output filler wire transporting velocity additive signal Fra=Fr+aIfd.Wherein a is a constant.AIfd is for as mentioned above, is used to increase an example of the function of transporting velocity.For example, as other example of this function, also can be made as the function that the conic section shape increases.In addition, also can be set as filler wire current detection signal If only just accelerates transporting velocity when threshold value is above mode.Filler wire carries control circuit FC to replace filler wire transporting velocity setting signal Fr as input with described filler wire transporting velocity additive signal Fra, thus control filler wire transporting velocity Fw.
In described embodiment 5, the situation based on embodiment 1 has been described, but also identical based on the situation of embodiment 2～4.That is, feed filler wire electric current I f during in, the value of corresponding filler wire electric current I f is accelerated filler wire transporting velocity Fw.
According to described embodiment 5, except effect, also obtain following effect with embodiment 1～4.That is, the transporting velocity by the filler wire in accelerating to feed in the filler wire during the electric current makes the melting speed of filler wire and transporting velocity obtain balance all the time.Therefore, the front end that can suppress filler wire breaks away from from the molten bath, and perhaps the front end of filler wire injects the labile state in molten bath.
Claims (7)
1. double-wire welding control method is between sacrificial electrode and mother metal, by applying crest voltage as one-period repeatedly and applying basic voltage, feeding welding current produces electric arc and forms the molten bath, and filler wire is flowed to described molten bath weld, it is characterized in that
Rising differentiation according to described basic voltage produces arc blow in described electric arc,
When determining the described arc blow of generation,, thereby eliminate arc blow by feeding and the unidirectional electric current of described welding current in described filler wire.
2. double-wire welding control method according to claim 1 is characterized in that,
From determine produce described arc blow the time be carved into decline according to described basic voltage determine eliminate till the arc blow during in, described filler wire is fed electric current.
3. double-wire welding control method according to claim 1 is characterized in that,
From determining the moment that produces described arc blow, in specified time limit, described filler wire is fed electric current.
4. double-wire welding control method according to claim 1 is characterized in that,
From determine produce described arc blow the time be carved into till moment of the described crest voltage that begins to apply next cycle during, described filler wire is fed electric current.
5. according to any described double-wire welding control method in the claim 1～4, it is characterized in that,
The electric current that feeds in described filler wire has its value to be passed through and the slope of increase in time.
6. according to any described double-wire welding control method in the claim 1～5, it is characterized in that,
In described filler wire, feed electric current during in, the transporting velocity of described filler wire is set as faster than the transporting velocity that does not feed in the described filler wire during the electric current.
7. according to any described double-wire welding control method in the claim 1～5, it is characterized in that,
The current value that feeds in the corresponding described filler wire changes the transporting velocity of described filler wire.
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| JP2009175974A JP5410189B2 (en) | 2008-12-22 | 2009-07-29 | 2-wire welding control method |
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| CN103028822A (en) * | 2011-09-30 | 2013-04-10 | 株式会社大亨 | Double-wire welding starting method |
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