CN104289790A - Double wire welding control method - Google Patents
Double wire welding control method Download PDFInfo
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- CN104289790A CN104289790A CN201410327768.XA CN201410327768A CN104289790A CN 104289790 A CN104289790 A CN 104289790A CN 201410327768 A CN201410327768 A CN 201410327768A CN 104289790 A CN104289790 A CN 104289790A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
- B23K9/124—Circuits or methods for feeding welding wire
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/095—Monitoring or automatic control of welding parameters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
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- Arc Welding In General (AREA)
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Abstract
The invention provides a double wire welding control method which may inhibit the situation that a filler wire (6) and a piece of base metal (2) are not in a short-circuit state due to feed change during the double wire welding process. An electric arc (3) is generated between a consumable electrode (1) and the base metal (2) to form a welding pool (2). The filler wire (6) and the welding pool (2) are in a short-circuit state for feeding to weld. According to the double wire welding control method, when the filler wire (6) and the base metal (2) are determined to be not in a short-circuit state in the welding process for longer than a first reference value (Tt1) during the time periods of t4-t5, a feeding speed (Fw) of the filler wire (6) is accelerated from a stable filler wire feed speed (Fc) to an accelerated filler wire feed speed (Fh). In such a way, even the filer wire (6) is not in a short-circuit state due to feed change, the short-circuit state can be restored rapidly.
Description
Technical field
The present invention relates to and produce electric arc to form molten bath between consumable electrode and mother metal, and two welding wire welding control methods that filler wire and molten bath become short-circuit condition ground feeding to weld.
Background technology
Known one produced electric arc to form molten bath between consumable electrode (hereinafter referred to as welding welding wire) and mother metal in the past, and two welding wire welding methods (with reference to patent document 1) of welding with this molten bath filler wire of feeding with becoming short-circuit condition.In this pair of welding wire welding method, owing to adding the motlten metal of filler wire in the motlten metal of welding welding wire, therefore motlten metal amount increases, at a high speed and be high efficiencyly welded into possibility.Especially, when carrying out high-speed welding by two welding wire welding method, in order to prevent becoming uneven welding bead, make filler wire from the rear of consumable electrode electric arc and molten bath short circuit ground feeding particularly important.Its reason is, carry out melting if be fed in consumable electrode electric arc by filler wire, then molten bath is cooled hardly, and also cannot press the latter half of projection in molten bath by filler wire, so there is no the effect suppressing uneven welding bead.In contrast, if make the rear portion short circuit in the molten bath of filler wire and electric arc circumference carry out feeding, the melting because of the heat in molten bath, then molten bath is cooled, and it is latter half of to push down molten bath by filler wire, thus can suppress the formation of uneven welding bead.Therefore, in two welding wire welding methods of prior art, no power make the overheated such electric current of filler wire and under cool state with molten bath short circuit, thus cool molten bath.
In two welding wire welding method; as the method producing electric arc between welding welding wire and mother metal, the various consumable electrode formula arc-welding process such as co3 gas arc welding connection, MAG (protection of consumable electrode active gases) welding, MIG (consumable electrode noble gas protective) welding, pulse arc welding connection, alternating current arc welding can be used.In addition, filler wire is welding wire front end and molten bath short circuit substantially, the melting because of the heat from molten bath.Therefore, electric arc can not be produced between filler wire and molten bath.In the present invention, although the situation using pulse arc welding connection as above-mentioned consumable electrode formula arc-welding process is described, also can be other weldings.In addition, in the following description, mother metal and molten bath is used with the roughly the same meaning.
Fig. 7 is the use of the current-voltage waveform figure in two welding wire welding methods of pulse electric arc welding.This figure (A) represents the time variations to the welding current Iw that welding welding wire is energized, this figure (B) represents the time variations of the weldingvoltage Vw applied between welding welding wire and mother metal (molten bath), and this figure (C) represents the feed speed Fw of filler wire.Although the feed speed of welding welding wire is not shown, with setting by constant speed feed.Voltage is not applied, no power electric current yet between filler wire and molten bath.Filler wire is as mentioned above to carry out feeding with the state of molten bath short circuit.Even if because filler wire does not also apply voltage away from molten bath, so can not electric arc be produced between filler wire and molten bath.Below, be described with reference to this figure.
Between the peak period of moment t1 ~ t2 in Tp, as shown in this figure (A), for making molten drop from the transition of welding welding wire, and the peak point current Ip of more than critical value that is energized big current value, as shown in this figure (B), between welding welding wire and molten bath, apply the crest voltage Vp growing up to ratio with electric arc.
In the base value period Tb of moment t2 ~ t3, as shown in this figure (A), for making not form molten drop, and the reference current Ib of the small area analysis value of the not enough critical value that is energized, as shown in this figure (B), apply reference voltage V b.Repeat to weld as 1 cycle (pulse period Tf) during till moment t1 ~ t3.Between the peak period of moment t3 ~ t4, the base value period Tb of Tp and moment t4 ~ t5 repeats action same as described above again.
On the other hand, as shown in this figure (C), the feed speed Fw of filler wire carrys out feeding with the state of the stable filler wire feed speed Fc of steady state value and molten bath short circuit.In order to stably melting, stablize filler wire feed speed Fc most cases and be set in the scope of 10 ~ 30% degree of the feed speed of welding welding wire.
But, in order to carry out good pulse electric arc welding, electric arc length is maintained adequate value particularly important.In order to maintain adequate value by long for electric arc, the output carrying out following such source of welding current controls (electric welding arc control).Electric arc live forever with the weldingvoltage mean value Vav shown in this figure (B) middle dotted line roughly in the relation of ratio.For this reason, detect weldingvoltage mean value Vav, the such output of the weldingvoltage setting value carrying out making the welding current mean value Iav shown in the dotted line of this figure (A) change to make this detected value equal to work as with appropriate electric arc appearance controls.Because when weldingvoltage mean value Vav is greater than weldingvoltage setting value be electric arc length longer than adequate value time, so reduce welding current mean value Iav to reduce welding wire melting speed, electric arc is grown and shortens.On the contrary, because weldingvoltage mean value Vav when to be electric arc length when being less than weldingvoltage setting value shorter than adequate value, so increase of weld current mean value Iav is to increase welding wire melting speed, makes electric arc long elongated.As above-mentioned weldingvoltage mean value Vav, weldingvoltage Vw is passed through the value after low pass filter (cut-off frequency 1 ~ 10Hz degree) by general use.In addition, as the operational ton making welding current mean value Iav change, the action that at least one of Tp between the peak period, pulse period Tf, peak point current Ip or reference current Ib is changed is carried out.Such as, when pulse period Tf is carried out FEEDBACK CONTROL as operational ton, between the peak period, Tp, peak point current Ip and reference current Ib are set to setting (being referred to as frequency modulation(PFM) control mode).In addition, when (pulse width) Tp carries out FEEDBACK CONTROL as operational ton between using the peak period, peak point current Ip, reference current Ib and pulse period Tf are set to setting (being referred to as pulse width modulation control method).
Fill in welding at the TIG shown in patent document 2, between filler wire and mother metal, apply small voltage (non-shorting detection voltage), no power electric current between filler wire and mother metal, differentiates that filler wire is used up thus, to give the alarm.That is, if apply the non-shorting detection voltage of several V not producing electric arc between filler wire and mother metal, then the electrical current when filler wire and mother metal are in short-circuit condition, being in away from no power electric current time state (non-shorting state).By the energising of this electric current, differentiate that filler wire is in short-circuit condition or is in non-shorting state.And when being judged as being in non-shorting state, the surplus of filler wire becomes 0, differentiate that becoming filler wire uses up.
In above-mentioned, although differentiate short-circuit condition or non-shorting state by the energising of electric current, also can be differentiated by magnitude of voltage as follows.Namely, if apply the non-shorting detection voltage of several V (such as 5V) not producing electric arc between filler wire and mother metal, then when filler wire and mother metal are in short-circuit condition, voltage (filler wire voltage) between filler wire and mother metal becomes 0V, becomes 5V when being in non-shorting state.Therefore, it is possible to differentiate short-circuit condition or non-shorting state according to the value of this filler wire voltage.
In addition, not make filler wire overheated in the scope that the current value be energized when above-mentioned filler wire and mother metal are in short-circuit condition is set at 0.05 ~ 1.0A degree.Thus one, the effect of the uneven welding bead of above-mentioned suppression can not be reduced.
At first technical literature
Patent document
Patent document 1: Japanese Unexamined Patent Publication 2012-170958 publication
Patent document 2: Japanese Unexamined Patent Publication 5-305441 publication
Summary of the invention
If repeatedly welded in during for a long time, then at the residue that the feed path (guider) of filler wire inner constantly accumulation filler wire is cut, the variation of feeding constantly becomes large.Its result, produces the non-shorting state of filler wire constantly in welding.When this non-shorting state is shorter than fixing period, not too there will be the impact on welding bead.But if this non-shorting state exceedes fixing period, then welding bead can worsen.
Thus, in the present invention, even if its object is to provide a kind of variation of the feeding resulting from filler wire and produce non-shorting state, two welding wire welding control methods that welding bead also can be suppressed to be deteriorated.
For solving the means of problem
In order to solve above-mentioned problem, the invention of technical scheme 1 is a kind of two welding wire welding control method, it is characterized in that, electric arc is produced to form molten bath between consumable electrode and mother metal, the mode feeding filler wire being in short-circuit condition according to filler wire and above-mentioned molten bath welds, the feature of this pair of welding wire welding control method is, in above-mentioned welding, differentiate that above-mentioned filler wire and above-mentioned molten bath have become non-shorting state, when this non-shorting state continue for more than the 1st predetermined a reference value, the feed speed of above-mentioned filler wire is made to accelerate to predetermined acceleration filler wire feed speed from predetermined stable filler wire feed speed.
The invention of technical scheme 2 is the two welding wire welding control methods described in technical scheme 1, it is characterized in that, by applying non-shorting differentiation voltage between above-mentioned filler wire and above-mentioned molten bath, carry out the differentiation being in above-mentioned short-circuit condition or above-mentioned non-shorting state between above-mentioned filler wire and above-mentioned molten bath.
The invention of technical scheme 3 is the two welding wire welding control methods described in technical scheme 1 or 2, it is characterized in that, above-mentioned acceleration filler wire feed speed becomes large mode according to the value of this acceleration filler wire feed speed along with the passing of time and changes.
The two welding wire welding control methods of invention according to any one of technical scheme 1 ~ 3 of technical scheme 4, it is characterized in that, when determine revert to above-mentioned short-circuit condition from above-mentioned non-shorting state more than above-mentioned 1st a reference value between above-mentioned filler wire and above-mentioned molten bath time, the feed speed of above-mentioned filler wire is restored to aforementioned stable filler wire feed speed.
The two welding wire welding control methods of invention according to any one of a kind of technical scheme 1 ~ 3 of technical scheme 5, it is characterized in that, when determine revert to above-mentioned short-circuit condition from above-mentioned non-shorting state more than above-mentioned 1st a reference value between above-mentioned filler wire and above-mentioned molten bath time, the feed speed of above-mentioned filler wire is maintained above-mentioned acceleration filler wire feed speed, till above-mentioned welding terminates.
The two welding wire welding control methods of invention according to any one of technical scheme 1 ~ 5 of technical scheme 6, is characterized in that, when the duration of above-mentioned non-shorting state reaches value 2nd a reference value of predetermined larger than above-mentioned 1st a reference value, stop above-mentioned welding.
Invention effect
According to the present invention, non-shorting state can be made promptly to revert to short-circuit condition.Thus, in the present invention, even if result from filler wire feeding variation and produce non-shorting state, welding bead also can be suppressed to be deteriorated.
Accompanying drawing explanation
Fig. 1 is the current-voltage waveform figure of the two welding wire welding control methods represented involved by embodiments of the present invention 1.
Fig. 2 is the block diagram of the welder for implementing the two welding wire welding control methods involved by embodiments of the present invention 1.
Fig. 3 is the current-voltage waveform figure of the two welding wire welding control methods represented involved by embodiments of the present invention 2.
Fig. 4 is the block diagram of the welder for implementing the two welding wire welding control methods involved by embodiments of the present invention 2.
Fig. 5 is the current-voltage waveform figure of the two welding wire welding control methods represented involved by embodiments of the present invention 3.
Fig. 6 is the block diagram of the welder for implementing the two welding wire welding control methods involved by embodiments of the present invention 3.
Fig. 7 be employ pulse electric arc welding in the prior art two welding wire welding methods in the middle of current-voltage waveform figure.
Detailed description of the invention
Below, with reference to accompanying drawing, embodiments of the present invention are described.
[embodiment 1]
Fig. 1 is the current-voltage waveform figure of the two welding wire welding control methods represented involved by embodiments of the present invention 1.This figure (A) represents the time variations of the mean value Iav to the welding current that welding welding wire is energized, this figure (B) represents the time variations of the mean value Vav of the weldingvoltage applied between welding welding wire and mother metal (molten bath), this figure (C) represents the time variations of the feed speed Fw of filler wire, and this figure (D) represents the time variations of the filler wire voltage Vf applied between filler wire and mother metal (molten bath).Although the feed speed of welding welding wire is not shown, with setting by constant speed feed.Welding current mean value Iav shown in this figure (A) and the weldingvoltage mean value Vav shown in this figure (B) is the value making the impulse waveform equalization shown in above-mentioned Fig. 7 and obtain, and is roughly steady state value.Below, be described with reference to this figure.
The feed speed Fw of the filler wire shown in this figure (C) is configured to stable filler wire feed speed Fc and is in short-circuit condition to make filler wire and molten bath.Between filler wire and molten bath, apply the non-shorting detection voltage of such as 5V, the filler wire voltage Vf shown in this figure (D) becomes 5V when filler wire is in non-shorting state, becomes 0V when being in short-circuit condition.
During moment t1 ~ t2 and during moment t3 ~ t5 be the guider consumption of filler wire as described above and produce the variation of feeding, thus during filler wire becomes non-shorting state.In addition, during, filler wire is in short-circuit condition.The non-shorting period of moment t1 ~ t2 is the situation of the time span of not enough the 1st predetermined a reference value Tt1 (second), and the non-shorting period of moment t3 ~ t5 is above the situation of the time span of the 1st a reference value Tt1.Even if the 1st a reference value Tt1 is set to filler wire become non-shorting state also hardly to the time span that welding bead impacts.1st a reference value Tt1 is set to such as 0.05 ~ 0.2 second degree.
As shown in this figure (A), welding current mean value Iav roughly becomes steady state value in whole period.As shown in this figure (B), weldingvoltage mean value Vav also roughly becomes steady state value in whole period.As shown in this figure (D), filler wire voltage Vf becomes 5V during moment t1 ~ t2 and during moment t3 ~ t5, during in addition, become 0V.
As shown in this figure (C), the feed speed Fw of filler wire becomes predetermined stable filler wire feed speed Fc during except during moment t1 ~ t2 and during moment t3 ~ t5.Because the non-shorting state of moment t1 ~ t2 is less than the 1st a reference value Tt1, so the feed speed Fw of filler wire keeps, to stablize filler wire feed speed Fc constant.Because during moment t3 ~ t4 be non-shorting state less than during the 1st a reference value Tt1, so the feed speed Fw of filler wire keeps, to stablize filler wire feed speed Fc constant.If reach the 1st a reference value Tt1 in the duration of the non-shorting state of moment t4, then the feed speed of filler wire is accelerated into predetermined acceleration filler wire feed speed Fh steppedly.If revert to short-circuit condition at moment t5 filler wire, then the feed speed Fw of filler wire is restored to stable filler wire feed speed Fc.Therefore, only become the moment t4 ~ t5 of more than the 1st a reference value Tt1 in the duration of the non-shorting state of filler wire during, the feed speed Fw of filler wire becomes acceleration filler wire feed speed Fh.For making non-shorting state promptly revert to short-circuit condition, this acceleration filler wire feed speed Fh is configured to the speed than stable filler wire feed speed Fc fast 30 ~ 100%.If it is too fast to accelerate filler wire feed speed Fh, then when reverting to short-circuit condition, the melting of filler wire is insufficient and become unstable.
In above-mentioned, as shown in this figure (C), acceleration filler wire feed speed Fh during showing moment t4 ~ t5 is the situation of steady state value, but also can according to the time process and the mode accelerated till its value reaches setting changes.That is, also can accelerate while there is gradient from moment t4, and converge on setting.So, because non-shorting state for extended periods continues, the value accelerating filler wire feed speed Fh becomes faster, so revert to the effect grow of short-circuit condition.On the contrary, when non-shorting state reverts to short-circuit condition in advance, because the value accelerating filler wire feed speed Fh does not become so fast, so revert to the melting stabilisation hastily of the filler wire after short-circuit condition.
When the feeding of filler wire is stablized, in welding, produce non-shorting state hardly.Therefore, when producing non-shorting state as this figure, can be said to the situation of the variation of the feeding that there is filler wire.Especially, when the non-shorting state of more than generation the 1st a reference value Tt1, represent that its variation is large.Thus, when there being the generation of the non-shorting state in welding, give the alarm based on its frequency and duration thereof.When there is alarm, weld job person terminates the welding of operation, then carries out the maintenance of the feed system guider of filler wire being replaced with new product etc.
Fig. 2 is the block diagram of the welder for implementing the two welding wire welding control methods involved by above-mentioned embodiments of the present invention 1.This figure is the situation of the electric arc 3 produced by consumable electrode formula pulse electric arc welding between welding welding wire 1 and molten bath 2, and exporting and controlling (electric welding arc control) is the situation that above-mentioned frequency modulation(PFM) controls.Below, each piece is illustrated with reference to this figure.
The source power supply of 3 phase 200V etc. (omitting diagram) as input, is carried out output control according to drive singal Dv described later by inverter control, exports the weldingvoltage Vw for generation of electric arc 3 and welding current Iw by electric power main circuit PM.Although the diagram of omission, this electric power main circuit PM possesses: to source power supply carry out rectification primary rectifier circuit, to the smoothing capacitor of the direct current be rectified, will the inverter circuit of high-frequency ac be become according to above-mentioned drive singal Dv by level and smooth DC converting, high-frequency ac step-down be become the high frequency transformer of appropriate magnitude of voltage, to being carried out the secondary commutation circuit of rectification and the reactor smoothing to the direct current be rectified by the high-frequency ac of step-down to produce electric arc 3.
Non-shorting detection voltage applying circuit VS is the formation that constant pressure source (omitting diagram) and resistor (omitting diagram) become series connection, is connected between filler wire 6 and molten bath 2.The value of this constant pressure source becomes above-mentioned non-shorting detection voltage Vs.Even if this non-shorting detection voltage Vs is configured to filler wire 6 become the value that non-shorting state does not produce electric arc yet, be configured to 1 ~ 8V degree.Such as, non-shorting detection voltage Vs=5V and resistor=50 Ω is set to.If the voltage between filler wire 6 and molten bath 2 to be labeled as filler wire voltage Vf, then to become filler wire voltage Vf=5V when filler wire 6 and molten bath 2 are in non-shorting state, becoming Vf=0V when being in short-circuit condition.When being in short-circuit condition, the electric current of 0.1A that filler wire 6 is energized.
Welding welding wire 1 is fed in welding torch 4 by the rotation of welding welding wire feeding roller 5 be combined with welding wire feed motor WM, power via feeder ear (omitting diagram) from above-mentioned electric power main circuit PM, thus produce electric arc 3 between mother metal (molten bath) 2.
Filler wire 6 is fed in filler wire guider 7 by the rotation of filler wire feed rolls 8 that is combined with filler wire feed motor FM, from above-mentioned non-shorting detection voltage applying circuit VS, via feeder ear (omit diagram), power non-shorting detection voltage Vs, melting under the state be short-circuited with the molten bath 2 formed by electric arc 3.In the figure, although illustrate that welding torch 4 and filler wire guider 7 are situations of different formations, also can from a welding torch feeding two welding wires (welding welding wire 1 and filler wire 6).
Emergency stop circuit ST exports the washout St becoming high level (High level) when emergent stopping.
Voltage detecting circuit VD detects above-mentioned weldingvoltage Vw, and voltage sense signal Vd.This voltage detection signal Vd as input, is made it equalization (low pass filter by cut-off frequency 1 ~ 10Hz degree) by voltage smoothing circuit VAV, exports weldingvoltage average value signal Vav.Voltage setting circuit VR exports predetermined weldingvoltage setting signal Vr.The error of this weldingvoltage setting signal Vr and above-mentioned weldingvoltage average value signal Vav is amplified by voltage error amplifying circuit EV, output voltage error amplifying signal Ev.
Voltage/frequency translation circuit VFC is transformed into the signal of the frequency proportional with the value of above-mentioned voltage error amplifying signal Ev, exports in the short time according to each frequency (pulse period) the pulse-period signal Tf becoming high level.Carry out above-mentioned frequency modulation(PFM) by this voltage/frequency translation circuit VFC to control.Between the peak period, initialization circuit TPR exports setting signal Tpr between the predetermined peak period.Between the peak period timer circuit TP using above-mentioned pulse-period signal Tf and between the above-mentioned peak period setting signal Tpr as input, export the time becoming high level from pulse-period signal Tf light in only during setting signal Tpr between the peak period specifies become high level peak period between signal Tp.Therefore, between this peak period signal Tp during to be its cycle be between pulse period, peak period in become high level, base period during in become the signal of low level (Low level).
Peak point current initialization circuit IPR exports predetermined peak point current setting signal Ipr.Reference current initialization circuit IBR exports predetermined background current setting signal Ibr.Current settings commutation circuit SI using signal Tp, above-mentioned peak point current setting signal Ipr between the above-mentioned peak period and above-mentioned background current setting signal Ibr as input, when signal Tp is high level (between the peak period) between the peak period, peak point current setting signal Ipr is exported as current settings signal Ir, when low level (during base value), background current setting signal Ibr is exported as current settings signal Ir.Current detection circuit ID detects above-mentioned welding current Iw, output electric current measure signal Id.The error of current error amplifying circuit EI to above-mentioned current settings signal Ir and above-mentioned current detection signal Id is amplified, output current error amplification signal Ei.Drive circuit DV using this current error amplifying signal Ei and above-mentioned washout St as input, when washout St is low level, PWM control is carried out based on current error amplifying signal Ei, and export the drive singal Dv for driving the inverter circuit in above-mentioned electric power main circuit PM based on its result, the not output drive signal Dv when washout St is high level.
Welding welding wire feeding Speed Setting circuit WR exports predetermined welding welding wire feeding rate setting signal Wr.Weld welding wire feeding control circuit WC using this welding welding wire feeding rate setting signal Wr and above-mentioned washout St as input, when washout St is low level, the welding welding wire feeding control signal Wc being used for carrying out feeding welding welding wire 1 with the feed speed being equivalent to the value of welding welding wire feeding rate setting signal Wr is exported to above-mentioned welding wire feed motor WM, when washout St is high level, do not export welding welding wire feeding control signal Wc.
Filler wire voltage detecting circuit VFD detects above-mentioned filler wire voltage Vf, exports filler wire voltage detection signal Vfd.Non-shorting judging circuit SD using this filler wire voltage detection signal Vfd as input, export following non-shorting judgment signal Sd, that is: be determined as when this value not enough predetermined short circuit discrimination a reference value (2.5V) and be in short-circuit condition and become low level, be determined as time more than the short circuit discrimination a reference value (2.5V) that this value is predetermined and be in non-shorting state and become high level.1st reference value circuit TT1 exports the 1st predetermined reference value signal Tt1.Above-mentioned non-shorting judgment signal Sd and the 1st reference value signal Tt1 as input, is exported the non-shorting later stage judgment signal Sdd after during non-shorting judgment signal Sd only switch on delay (0n delay) is specified by the 1st reference value signal Tt1 by non-shorting later stage judging circuit SDD.This non-shorting later stage judgment signal Sdd be only the duration of non-shorting state become longer than the value of the 1st reference value signal Tt1 during become the signal of high level in (during the moment t4 ~ t5 of Fig. 1).
Stablize filler wire feed speed initialization circuit FCR and export predetermined stable filler wire feed speed setting signal Fcr.Accelerate filler wire feed speed initialization circuit FHR and export predetermined acceleration filler wire feed speed setting signal Fhr.Filler wire feed speed sets commutation circuit SF using above-mentioned stable filler wire feed speed setting signal Fcr, above-mentioned acceleration filler wire feed speed setting signal Fhr and above-mentioned non-shorting later stage judgment signal Sdd as input, when non-shorting later stage judgment signal Sdd is high level, will speed up filler wire feed speed setting signal Fhr to export as filler wire feed speed setting signal Fr, when low level, stable filler wire feed speed setting signal Fcr is exported as filler wire feed speed setting signal Fr.Filler wire feeding control circuit FCT using this filler wire feed speed setting signal Fr and above-mentioned washout St as input, when washout St is low level, the filler wire feeding control signal Fct being used for carrying out feeding filler wire 6 with the feed speed of the value being equivalent to filler wire feed speed setting signal Fr is exported to above-mentioned filler wire feed motor FM, when washout St is high level, do not export filler wire feeding control signal Fct.
In the figure, for making acceleration filler wire feed speed Fh constantly become large, as long as change above-mentioned acceleration filler wire feed speed initialization circuit FHR as follows along with time process.Namely, accelerate filler wire feed speed initialization circuit FHR using above-mentioned non-shorting later stage judgment signal Sdd as input, export time of lighting along with the time becoming high level from non-shorting later stage judgment signal Sdd through and constantly become large acceleration filler wire feed speed setting signal Fhr.Although this figure is the situation controlling to carry out electric welding arc control by frequency modulation(PFM), also other modulation controls such as pulse width modulation control can be used.
According to above-mentioned embodiment 1, in welding, differentiate that filler wire and molten bath have become non-shorting state, when this non-shorting state continue for more than the 1st predetermined a reference value, the feed speed of filler wire is made to accelerate to predetermined acceleration filler wire feed speed from predetermined stable filler wire feed speed.Thereby, it is possible to make non-shorting state promptly revert to short-circuit condition.Thus, in the present embodiment, even if result from filler wire feeding variation and produce non-shorting state, welding bead also can be suppressed to be deteriorated.
In above-mentioned embodiment 1, although the description of being fetched the situation producing electric arc by pulse arc welding, but the arc welding of all consumable electrode formulas can be used.
[embodiment 2]
Embodiments of the present invention 2, when reverting to short-circuit condition from non-shorting state more than 1st a reference value between filler wire and molten bath, maintain the feed speed of filler wire and accelerate filler wire feed speed, till welding terminates.In above-mentioned embodiment 1, if revert to short-circuit condition, be then restored to stable filler wire feed speed, but former state maintains acceleration filler wire feed speed in embodiment 2.
Fig. 3 is the current-voltage waveform figure of the two welding wire welding control methods represented involved by embodiments of the present invention 2.This figure (A) represents the time variations of the mean value Iav to the welding current that welding welding wire is energized, this figure (B) represents the time variations of the mean value Vav of the weldingvoltage applied between welding welding wire and mother metal (molten bath), this figure (C) represents the time variations of the feed speed Fw of filler wire, and this figure (D) represents the time variations of the filler wire voltage Vf between filler wire and mother metal (molten bath).Although the feed speed of welding welding wire is not shown, with setting by constant speed feed.This figure is corresponding with above-mentioned Fig. 1, and the action that only moment t5 is later is different.Below, with reference to this figure, the action that moment t5 is later is described.
Because during moment t3 ~ t4 be non-short-circuit condition less than during the 1st a reference value Tt1, so the feed speed Fw of filler wire keeps, to stablize filler wire feed speed Fc constant.If reach the 1st a reference value Tt1 in the duration of the non-shorting state of moment t4, then stepped being accelerated into of the feed speed of filler wire accelerates filler wire feed speed Fh.Even if revert to short-circuit condition at moment t5 filler wire, the feed speed Fw of filler wire also maintains and accelerates filler wire feed speed Fh till the welding of this workpiece terminates.Therefore, the moment t4 becoming more than the 1st a reference value Tt1 in the duration of the non-shorting state from filler wire to welding terminates during, the feed speed Fw of filler wire becomes and accelerates filler wire feed speed Fh.
In above-mentioned, as shown in this figure (C), the acceleration filler wire feed speed Fh showing moment t4 later is the situation of steady state value, but also can in the same manner as embodiment 1, and according to the process with the time, the mode accelerated till its value reaches setting changes.That is, also can accelerate while there is gradient from moment t4, and converge on setting.
Fig. 4 is the block diagram of the welder for implementing the two welding wire welding control methods involved by above-mentioned embodiments of the present invention 2.This figure is corresponding with above-mentioned Fig. 2, gives same label for same, and omits their explanation.This figure is the figure non-shorting later stage judging circuit SDD of Fig. 2 being replaced as the 2nd non-shorting later stage judging circuit SDD2.Below, with reference to this figure, this block is described.
2nd non-shorting later stage judging circuit SDD2 using non-shorting judgment signal Sd and the 1st reference value signal Tt1 as input, export following non-shorting later stage judgment signal Sdd, that is: light in the time becoming high level from non-shorting judgment signal Sd be set to high level when during being specified by the 1st reference value signal Tt1, if welding terminates, be reset to low level.This non-shorting later stage judgment signal Sdd be reach the duration of non-short-circuit condition the time point of the value of the 1st reference value signal Tt1 later during the moment t4 of the Fig. 3 (later during) become the signal of high level.
According to above-mentioned embodiment 2, when determine revert to short-circuit condition from non-shorting state more than 1st a reference value between filler wire and molten bath time, the feed speed of filler wire is maintained and accelerates filler wire feed speed, till welding terminates.Producing the such situation of the non-shorting state of more than the 1st a reference value is that the feeding of filler wire has more cataclysmal situation.Therefore, under these circumstances, even if also accelerate the feed speed of filler wire in short-circuit condition, thus inhibit and again produce non-shorting state.
[embodiment 3]
In embodiments of the present invention 3, when the duration of non-shorting state reaches value 2nd a reference value of predetermined larger than the 1st a reference value, impose emergent stopping to stop welding.
Fig. 5 is the current-voltage waveform figure of the two welding wire welding control methods represented involved by embodiments of the present invention 3.This figure (A) represents the time variations of the mean value Iav to the welding current that welding welding wire is energized, this figure (B) represents the time variations of the mean value Vav of the weldingvoltage applied between welding welding wire and mother metal (molten bath), this figure (C) represents the time variations of the feed speed Fw of filler wire, and this figure (D) represents the time variations of the filler wire voltage Vf between filler wire and mother metal (molten bath).Although the feed speed of welding welding wire is not shown, with setting by constant speed feed.This figure is corresponding with above-mentioned Fig. 1, and the action that only moment t5 is later is different.Below, with reference to this figure, the action that moment t5 is later is described.
As shown in this figure (C) because during moment t3 ~ t4 be non-short-circuit condition less than during the 1st a reference value Tt1, so the feed speed Fw of filler wire keeps, to stablize filler wire feed speed Fc constant.If reach the 1st a reference value Tt1 in the duration of the non-shorting state of moment t4, then stepped being accelerated into of the feed speed of filler wire accelerates filler wire feed speed Fh.Afterwards, if reach the value larger than the 1st a reference value and the 2nd predetermined a reference value Tt2 in the duration of the non-shorting state of moment t5, then emergent stopping is imposed to stop welding.The stopping of so-called welding, refers to the output stopping weldingvoltage Vw and welding current Iw, stops the feeding of welding welding wire 1, stops the feeding of filler wire 6.Therefore, at moment t5, as Suo Shi this figure (A), welding current mean value Iav becomes 0A, as Suo Shi this figure (B), weldingvoltage mean value Vav becomes 0V, as Suo Shi this figure (C), the feed speed Fw of filler wire becomes 0, and as Suo Shi this figure (D), filler wire voltage Vf becomes 0V.
The 2nd above-mentioned a reference value Tt2 is set to the value becoming weld defect when non-shorting state continue for more than this time span.Its setting range is 0.3 ~ 1.0 second degree.
Fig. 6 is the block diagram of the welder for implementing the two welding wire welding control methods involved by above-mentioned embodiments of the present invention 3.This figure is corresponding with above-mentioned Fig. 2, gives same label for same, and omits their explanation.This figure is the figure emergency stop circuit ST of Fig. 2 being replaced as the 2nd emergency stop circuit ST2.Below, with reference to this figure, this block is described.
2nd emergency stop circuit ST2 is using non-shorting judgment signal Sd as input, and the elapsed time of lighting when the time becoming high level from non-shorting judgment signal Sd is output into the washout St of high level when reaching the 2nd predetermined a reference value Tt2.
According to above-mentioned embodiment 3, when the duration of the non-shorting state of filler wire reaches the value larger than the 1st a reference value and the 2nd predetermined a reference value, stop welding.Thus, can determine welding bead become bad when, can stop welding.Thus, without the need to carrying out unnecessary welding, can implement filler wire guider etc. feed system maintenance basis on carry out in advance welding restart.
Although embodiment 3 carrys out additional emergency stop function based on embodiment 1, also can add based on embodiment 2.
Label declaration
1 welding welding wire
2 mother metals, molten bath
3 electric arcs
4 welding torches
5 welding welding wire feeding rollers
6 filler wires
7 filler wire guiders
8 filler wire feed rolls
DV drive circuit
Dv drive singal
EI current error amplifying circuit
Ei current error amplifying signal
EV voltage error amplifying circuit
Ev voltage error amplifying signal
Fc stablizes filler wire feed speed
FCR stablizes filler wire feed speed initialization circuit
Fcr stablizes filler wire feed speed setting signal
FCT filler wire feeding control circuit
Fct filler wire feeding control signal
Fh accelerates filler wire feed speed
FHR accelerates filler wire feed speed initialization circuit
Fhr accelerates filler wire feed speed setting signal
FM filler wire feed motor
Fr filler wire feed speed setting signal
Fw feed speed
Iav welding current mean value
Ib reference current
IBR reference current initialization circuit
Ibr reference current setting signal
ID current detection circuit
Id current detection signal
Ip peak point current
IPR peak point current initialization circuit
Ipr peak point current setting signal
Ir current settings signal
Iw welding current
PM electric power main circuit
The non-shorting judging circuit of SD
The non-shorting judgment signal of Sd
The non-shorting later stage judging circuit of SDD
The non-shorting later stage judgment signal of Sdd
The non-shorting later stage judging circuit of SDD2 the 2nd
SF filler wire feed speed setting commutation circuit
SI current settings commutation circuit
ST emergency stop circuit
St washout
ST2 the 2nd emergency stop circuit
During Tb base value
The Tf pulse period (signal)
Timer circuit between the TP peak period
Between the Tp peak period (signal)
Initialization circuit between the TPR peak period
Setting signal between the Tpr peak period
TT1 the 1st reference value circuit
Tt1 the 1st a reference value (setting signal)
Tt2 the 2nd a reference value
VAV voltage smoothing circuit
Vav weldingvoltage mean value (signal)
Vb base value voltage
VD voltage detecting circuit
Vd voltage detection signal
Vf filler wire voltage
VFC voltage/frequency translation circuit
VFD filler wire voltage detecting circuit
Vfd filler wire voltage detection signal
Vp crest voltage
VR voltage setting circuit
Vr weldingvoltage setting signal
The non-shorting detection voltage applying circuit of VS
The non-shorting detection voltage of Vs
Vw weldingvoltage
WC welds welding wire feeding control circuit
Wc welds welding wire feeding control signal
WM welds wire feed motor
WR welds welding wire feeding Speed Setting circuit
Wr welds welding wire feeding rate setting signal
Claims (6)
1. a two welding wire welding control method, between consumable electrode and mother metal, produce electric arc to form molten bath, the mode feeding filler wire being in short-circuit condition according to filler wire and above-mentioned molten bath welds, and the feature of this pair of welding wire welding control method is,
In above-mentioned welding, differentiate that above-mentioned filler wire and above-mentioned molten bath have been in non-shorting state, when this non-shorting state continue for more than the 1st predetermined a reference value, the feed speed of above-mentioned filler wire is made to accelerate to predetermined acceleration filler wire feed speed from predetermined stable filler wire feed speed.
2. according to claim 1 pair of welding wire welding control method, is characterized in that,
By applying non-shorting differentiation voltage between above-mentioned filler wire and above-mentioned molten bath, carry out the differentiation being in above-mentioned short-circuit condition or above-mentioned non-shorting state between above-mentioned filler wire and above-mentioned molten bath.
3. according to claim 1 and 2 pair of welding wire welding control method, is characterized in that,
Above-mentioned acceleration filler wire feed speed becomes large mode according to the value of this acceleration filler wire feed speed along with the passing of time and changes.
4. the two welding wire welding control methods according to any one of claims 1 to 3, is characterized in that,
When determine revert to above-mentioned short-circuit condition from above-mentioned non-shorting state more than above-mentioned 1st a reference value between above-mentioned filler wire and above-mentioned molten bath time, the feed speed of above-mentioned filler wire is restored to aforementioned stable filler wire feed speed.
5. the two welding wire welding control methods according to any one of claims 1 to 3, is characterized in that,
When determine revert to above-mentioned short-circuit condition from above-mentioned non-shorting state more than above-mentioned 1st a reference value between above-mentioned filler wire and above-mentioned molten bath time, the feed speed of above-mentioned filler wire is maintained above-mentioned acceleration filler wire feed speed till above-mentioned welding terminates.
6. the two welding wire welding control methods according to any one of Claims 1 to 5, is characterized in that,
When the duration of above-mentioned non-shorting state reaches value 2nd a reference value of predetermined larger than above-mentioned 1st a reference value, stop above-mentioned welding.
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| JP2013-149010 | 2013-07-18 | ||
| JP2013149010A JP6144137B2 (en) | 2013-07-18 | 2013-07-18 | 2-wire welding control method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5759248Y2 (en) * | 1976-03-26 | 1982-12-17 | ||
| CN101821048A (en) * | 2007-10-16 | 2010-09-01 | 株式会社大亨 | Arc start control method |
| CN102205454A (en) * | 2010-03-31 | 2011-10-05 | 株式会社大亨 | Electric arc welding method |
| CN103084705A (en) * | 2011-10-28 | 2013-05-08 | 株式会社大亨 | Current control method during necking detection of fusion electrode electric arc welding |
| JP2013094850A (en) * | 2011-11-07 | 2013-05-20 | Panasonic Corp | Method of controlling arc welding and apparatus for arc welding |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH05305441A (en) | 1992-04-30 | 1993-11-19 | Ishikawajima Harima Heavy Ind Co Ltd | Method for detecting welding wire running out |
| JP5706710B2 (en) | 2011-02-18 | 2015-04-22 | 株式会社ダイヘン | 2-wire welding control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5759248Y2 (en) * | 1976-03-26 | 1982-12-17 | ||
| CN101821048A (en) * | 2007-10-16 | 2010-09-01 | 株式会社大亨 | Arc start control method |
| CN102205454A (en) * | 2010-03-31 | 2011-10-05 | 株式会社大亨 | Electric arc welding method |
| CN103084705A (en) * | 2011-10-28 | 2013-05-08 | 株式会社大亨 | Current control method during necking detection of fusion electrode electric arc welding |
| JP2013094850A (en) * | 2011-11-07 | 2013-05-20 | Panasonic Corp | Method of controlling arc welding and apparatus for arc welding |
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| KR102134488B1 (en) | 2020-07-15 |
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