CN104690397A - Anti-viscin thread control method - Google Patents
Anti-viscin thread control method Download PDFInfo
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- CN104690397A CN104690397A CN201410710090.3A CN201410710090A CN104690397A CN 104690397 A CN104690397 A CN 104690397A CN 201410710090 A CN201410710090 A CN 201410710090A CN 104690397 A CN104690397 A CN 104690397A
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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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Abstract
The invention provides an anti-viscin thread control method comprising the following the steps: feeding a solder wire doped with solder agent; carrying out constant voltage control according to a voltage setting signal (Er), thus outputting a welding voltage (Vw) and a welding current (Iw), and carrying out welding; if a welding start signal (St) is changed into a stop instruction, than the voltage setting signal (Er) is switched into an anti-viscin thread voltage setting value (Ear), thus stop welding. The anti-viscin thread voltage setting value (Ear) is set in vibration waveform, so the welding current (Iw) is set to vibration waveforms of triangle shape or sine wave shape, and the anti-viscin thread voltage setting value (Ear) is set to prevent short circuit in an anti-viscin thread control period (Ta); welding agent in the solder wire can be gasified so as to prevent slags from attaching to the front end of the solder wire. The solder wire with solder agent is used for arc welding so as to prevent slags from attaching to the front end of the solder wire, thus providing better arcing property.
Description
Technical field
The present invention relates to the wire sticking prevention control method of the arc welding employing the welding wire being mixed with solder flux.
Background technology
Carbon dioxide is used as protective gas and use be mixed with the welding wire of solder flux arc welding, do not use protective gas but the droplet transfer mode using self-shield (self-shielded) self-shielded arc welding of the welding wire being mixed with solder flux to connect in (self-shielded arc welding) etc. is spray transfer mode.In spray transfer mode, by arc heat, welding wire front end is transferred to molten bath after being melted and becoming particulate.In spray transfer mode, molten drop is not short circuiting transfer, but the transition by free-falling.
Employ the source of welding current using constant-voltage characteristic in the arc welding (the welding wire welding hereinafter referred to as being mixed with solder flux) of the welding wire being mixed with solder flux, with constant speed feeding welding wire.The welding wire welding being mixed with solder flux has the few and feature that weld appearance is also good of generation of sputtering thing.
On the other hand, in the welding wire welding being mixed with solder flux, the problem that cannot obtain the good starting the arc is in most instances deposited.This is because the welding wire being mixed with solder flux comprises more slag composition compared with solid core welding wire, the slag after wire sticking prevention controls at the end of welding after melting can be accumulated in welding wire front end, it is frozen into insulant.If start welding under the state that the front end of welding wire is attached with slag, even if then welding wire contacts with mother metal, due to across slag, therefore the striking of electric arc unsuccessfully.Below, the wire sticking prevention control method of the prior art in the welding wire welding being mixed with solder flux is described with reference to accompanying drawing.
Figure 11 represents the sequential chart being mixed with the wire sticking prevention control method of the welding wire welding of solder flux of the prior art.This figure (A) represents the time variations of welding commencing signal St, this figure (B) represents the time variations of the voltage setting signal Er of the output valve of the constant-voltage characteristic for setting the source of welding current, this figure (C) represents the time variations of the feed speed Fw of welding wire, this figure (D) represents the time variations of the weldingvoltage Vw applied between welding wire and mother metal, and this figure (E) represents the time variations to the welding current Iw that electric arc is energized.Below, be described with reference to this figure.
From the outside input welding commencing signal St of the source of welding current, if become High (height) level, become sign on, if become Low (low) level, become END instruction.In the figure, during becoming constant weld during moment t1 ~ t2, during moment t2 ~ t5, become wire sticking prevention control period Ta.
During the constant weld of moment t1 ~ t2, as shown in this figure (A), welding commencing signal St becomes High level (sign on).As shown in this figure (B), voltage setting signal Er becomes the predetermined constant voltage setting value Ecr of steady state value.As shown in this figure (C), feed speed Fw becomes steady state value.As shown in this figure (D), how many weldingvoltage Vw has changes up and down, but is roughly steady state value.As shown in this figure (E), how many welding current Iw also has changes up and down, but is roughly steady state value.The instant value of weldingvoltage Vw sets according to voltage setting signal Er.The mean value of welding current Iw sets according to the feed speed Fw of welding wire.
At moment t2, as shown in this figure (A), if welding commencing signal St becomes Low level (END instruction), then export halt instruction to feed motor, therefore as shown in this figure (C), feed speed Fw slows down gradually because of inertia, becomes 0 and stop at moment t3.Meanwhile, as shown in this figure (B), voltage setting signal Er is reduced to wire sticking prevention voltage setting value Ear at moment t2 from constant voltage setting value Ecr.During the predetermined wire sticking prevention control period Ta of moment t2 ~ t5, continue the output of the source of welding current.
As shown in this figure (D), the value due to voltage setting signal Er is that therefore weldingvoltage Vw becomes than value little during constant weld than value little during constant weld, i.e. wire sticking prevention voltage setting value Ear.Similarly, as shown in this figure (E), because feed speed Fw slows down, the value that the value during therefore welding current Iw becomes than constant weld is little.Then, during moment t2 ~ t3, there is twice short circuit.During the short circuit of moment t21 ~ t22 and moment t23 ~ t24, as shown in this figure (D), weldingvoltage Vw becomes the short circuit voltage value of a few V, and as shown in this figure (E), welding current Iw increases.
If become 0 at moment t3 feed speed Fw, then arc length is elongated because lighting gradually, in moment t4 extinguishing arc.Therewith in linkage, as shown in this figure (D), weldingvoltage Vw increases gradually from moment t3, is sharply increased to non-load voltage value at moment t4, is maintained until moment t5.As shown in this figure (E), welding current Iw becomes 0 till being energized to the moment t4 of arc extinction always afterwards.
Moment t5 after wire sticking prevention control period Ta terminates, the front end of welding wire deviates from mutually with molten bath, forms grain in the front end of welding wire.Become telomere before this welding wire and be attached with the state of slag.
In the invention of patent document 1, welding current Iw during constant weld in be non-impulse waveform, be impulse waveform in wire sticking prevention control period Ta.Thereby, it is possible to the sputtering reduced in wire sticking prevention control period Ta produces.
Patent document 1:JP JP 2007-313513 publication
Summary of the invention
Therefore, in the present invention, object is to provide a kind of situation of the front end of the welding wire at the end of welding attachment slag that can suppress in the welding wire welding being mixed with solder flux to ensure the wire sticking prevention control method of the starting the arc well.
In order to solve above-mentioned problem, the invention of technical scheme 1 is wire sticking prevention control method,
Feeding is mixed with the welding wire of solder flux, and carry out Isobarically Control based on voltage setting signal and export weldingvoltage and welding current, weld thus, if welding commencing signal becomes END instruction, then export halt instruction to feed motor, and described voltage setting signal is switched to wire sticking prevention voltage setting value from constant voltage setting value, thus terminate welding, the feature of this wire sticking prevention control method is
By described wire sticking prevention voltage setting value is set to vibrational waveform, thus described welding current is set to the wavy or sinuous vibrational waveform of triangle, described wire sticking prevention voltage setting value is set as the value that can not produce short circuit during described wire sticking prevention controls.
The invention of technical scheme 2 is wire sticking prevention control methods that technical scheme 1 is recorded, and it is characterized in that, changes amplitude and/or the cycle of the vibrational waveform of described wire sticking prevention voltage setting value according to the described kind being mixed with the welding wire of solder flux.
The invention of technical scheme 3 is the wire sticking prevention control methods described in technical scheme 1 or 2, it is characterized in that, by be switched to described wire sticking prevention voltage setting value from described voltage setting signal time point the described amplitude of described wire sticking prevention voltage setting value after given period and/or described cycle set be than value also large before described given period.
The invention of technical scheme 4 is the wire sticking prevention control methods described in technical scheme 1 or 2, it is characterized in that, by be switched to described wire sticking prevention voltage setting value from described voltage setting signal time point the described amplitude of described wire sticking prevention voltage setting value after period demand and/or described cycle set be than value also large before described given period.
The invention of technical scheme 5 is the wire sticking prevention control methods in technical scheme 1 ~ 4 described in any one, it is characterized in that, when this welding dwell time terminated to welding next time starts is more than fiducial time, this described wire sticking prevention voltage setting value is set to vibrational waveform, when described dwell time is less than described fiducial time, this described wire sticking prevention voltage setting value is set to steady state value.
Invention effect
According to the present invention, by welding current is set to vibrational waveform, thus repeatedly can produce flux constituent gasification inside welding wire for the state of metal ingredient melting making the state exposed of metal ingredient in outside and will expose, terminate welding under state welding wire leading section can not being attached at slag.In addition, according to the present invention, by the vibrational waveform of welding current being set to the wavy or sinusoidal wave shape of triangle, thus arc force can be changed reposefully, the generation of sputtering can be reduced, weld appearance can be made good.In addition, according to the present invention, by preventing the short circuit in wire sticking prevention control period, can prevent with short circuit in the situation of the leading section of welding wire attachment from the slag in molten bath.By these action effects, in the present invention, in the situation of welding wire front end attachment slag at the end of can suppressing to weld in the welding wire welding being mixed with solder flux, the starting the arc can be made to become good.
Accompanying drawing explanation
Fig. 1 is the block diagram of the source of welding current of wire sticking prevention control method for implementing embodiments of the present invention 1.
Fig. 2 is the sequential chart of each signal in the source of welding current of Fig. 1 of wire sticking prevention control method for illustration of embodiments of the present invention 1.
Fig. 3 is the block diagram of the source of welding current of wire sticking prevention control method for implementing embodiments of the present invention 2.
Fig. 4 is the sequential chart of each signal in the source of welding current of Fig. 3 of wire sticking prevention control method for illustration of embodiments of the present invention 2.
Fig. 5 is the block diagram of the source of welding current of wire sticking prevention control method for implementing embodiments of the present invention 3.
Fig. 6 is the sequential chart of each signal in the source of welding current of Fig. 5 of wire sticking prevention control method for illustration of embodiments of the present invention 3.
Fig. 7 is the block diagram of the source of welding current of wire sticking prevention control method for implementing embodiments of the present invention 4.
Fig. 8 is the block diagram employing the welder of robot of the wire sticking prevention control method for implementing embodiments of the present invention 5.
Fig. 9 be for illustration of embodiments of the present invention 5 wire sticking prevention control method, dwell time Td be more than fiducial time time Fig. 8 welder in the sequential chart of each signal.
Figure 10 be for illustration of embodiments of the present invention 5 wire sticking prevention control method, dwell time Td be less than fiducial time time Fig. 8 welder in the sequential chart of each signal.
Figure 11 represents the sequential chart being mixed with the wire sticking prevention control method of the welding wire welding of solder flux of the prior art.
Detailed description of the invention
Below, with reference to accompanying drawing, embodiments of the present invention are described.
[embodiment 1]
Fig. 1 is the block diagram of the source of welding current of wire sticking prevention control method for implementing embodiments of the present invention 1.Below, with reference to this figure, each module is described.
Electric power main circuit PM, using the source power supplies such as 3 phase 200V (omitting diagram) as input, carries out output by the convertor controls based on drive singal Dv described later and controls, export output voltage E.Although the diagram of eliminating, this electric power main circuit PM possess to source power supply carry out rectification primary rectifier circuit, to the smoothing capacitor of the direct current after rectification, by the DC converting after smoothing be high-frequency ac converter circuit, high-frequency ac be depressurized to the high frequency transformer of the magnitude of voltage being suitable for arc welding and the high-frequency ac after step-down carried out to the secondary commutation circuit of rectification.Reactor WL exports weldingvoltage Vw to after above-mentioned output voltage E smoothingization.
By the rotation of feed rolls 5 combined with feed motor WM, feeding welding wire 1 in welding torch 4, produces electric arc 3 and welds between mother metal 2.Apply weldingvoltage Vw between feeder ear (tip, チ Star プ) (omitting diagram) in welding torch 4 and mother metal 2, among electric arc 3, welding electric current I w is energized.Welding wire 1 uses the welding wire being mixed with solder flux.
Constant voltage initialization circuit ECR exports predetermined constant voltage setting signal Ecr.Wire sticking prevention voltage bias values initialization circuit ESR exports predetermined wire sticking prevention voltage bias values setting signal Esr.Amplitude setting circuit WR exports predetermined amplitude setting signal Wr.Cycle set circuit TFR exports predetermined cycle set signal Tfr.
Wire sticking prevention voltage setting circuit EAR is with the corresponding welding commencing signal St of the on/off of the welding torch switch (omit and illustrate) with welding torch 4, above-mentioned wire sticking prevention voltage bias values setting signal Esr, above-mentioned amplitude setting signal Wr and above-mentioned cycle set signal Tfr is as input, if welding commencing signal St is changing into Low level, then to export on the steady state value determined according to wire sticking prevention voltage bias values setting signal Esr the overlapping waveform vibrated with the amplitude determined according to amplitude setting signal Wr and carrying out according to the cycle that cycle set signal Tfr determines, and become the wire sticking prevention voltage setting signal Ear of vibrational waveform.
Start-up circuit ON is using above-mentioned welding commencing signal St as input, welding commencing signal St is changing into the predetermined wire sticking prevention control period Ta of moment turn-off delay (off delay) of Low level from High level, export enabling signal On, and export the wire sticking prevention control period signal Tas becoming High level at wire sticking prevention control period Ta.
Voltage setting circuit ER is using above-mentioned constant voltage setting signal Ecr, above-mentioned wire sticking prevention voltage setting signal Ear and above-mentioned wire sticking prevention control period signal Tas as input, when wire sticking prevention control period signal Tas becomes Low level (during constant weld), export constant voltage setting signal Ecr as voltage setting signal Er, when becoming High level (wire sticking prevention control period Ta), export wire sticking prevention voltage setting signal Ear as voltage setting signal Er.
Output voltage detecting circuit ED is smoothing after detecting above-mentioned output voltage E, exports voltage sense signal Ed.Voltage error amplifying circuit EV amplifies the error between above-mentioned voltage setting signal Er (+) and this voltage sense signal Ed (-), output voltage error amplifying signal Ev.By this voltage error amplifying circuit EV, Isobarically Control is carried out to the source of welding current.
Drive circuit DV is using above-mentioned voltage error amplifying signal Ev and above-mentioned enabling signal On as input, and when enabling signal On is High level, the PWM of carrying out based on voltage error amplifying signal Ev controls, and exports the drive singal Dv based on its result.Thus, during welding commencing signal St is High level+wire sticking prevention control period Ta during, start the source of welding current, output voltage E exported.
Feed speed initialization circuit FR exports predetermined feed speed setting signal Fr.Feeding control circuit FC is using this feed speed setting signal Fr and above-mentioned welding commencing signal St as input, when welding commencing signal St is High level, export to above-mentioned feed motor WM and be used for the feeding control signal Fc of the value feeding welding wire 1 determined according to feed speed setting signal Fr, if welding commencing signal St becomes Low level, then export the feeding control signal Fc as halt instruction that the rotation of feed motor WM is stopped.
Fig. 2 is the sequential chart of each signal in the source of welding current of Fig. 1 of wire sticking prevention control method for illustration of embodiments of the present invention 1.This figure (A) represents the time variations of welding commencing signal St, this figure (B) represents the time variations of the voltage setting signal Er of the output valve of the constant-voltage characteristic for setting the source of welding current, this figure (C) represents the time variations of the feed speed Fw of welding wire, this figure (D) represents the time variations of the weldingvoltage Vw applied between welding wire and mother metal, and this figure (E) represents the time variations to the welding current Iw that electric arc is energized.This figure corresponds to above-mentioned Figure 11, and the action during the constant weld of moment t1 ~ t2 is identical, therefore no longer repeat specification.Below, with reference to this figure, different actions is described.
From the outside input welding commencing signal St of the source of welding current, if become High level, then become sign on, if become Low level, then become END instruction.In the figure, during becoming constant weld during moment t1 ~ t2, during moment t2 ~ t5, become wire sticking prevention control period Ta.
During the constant weld of moment t1 ~ t2, as shown in this figure (B), voltage setting signal Er becomes the value of constant voltage setting signal Ecr, is steady state value.
At moment t2, as shown in this figure (A), if welding commencing signal St becomes Low level (END instruction), then export halt instruction to feed motor, therefore as shown in this figure (C), feed speed Fw slows down gradually because of inertia, becomes 0 and stop at moment t3.The output of the source of welding current is continued in during the predetermined wire sticking prevention control period Ta of moment t2 ~ t5.During during this wire sticking prevention control period Ta is configured to slow down because of inertia than feed motor, (during moment t2 ~ t3) also grows.Feed motor is the value different along with the kind of motor between the deceleration period because of inertia, is 50 ~ 100ms degree.The value obtained being added 50 ~ 100ms degree between this deceleration period is set as wire sticking prevention control period Ta.
In addition, at moment t2, if welding commencing signal St becomes Low level, then, as shown in this figure (B), voltage setting signal Er becomes the value set according to wire sticking prevention voltage setting signal Ear, becomes vibrational waveform.As shown in this figure (B), wire sticking prevention voltage setting signal Ear, using the value of wire sticking prevention voltage bias values setting signal Esr as central value, becomes with the waveform of the cycle of the amplitude of amplitude setting signal Wr and cycle set signal Tfr by the wavy vibration of rectangle.Therewith in linkage, as shown in this figure (D), weldingvoltage Vw becomes the waveform of the wavy vibration of triangle.Similarly, as shown in this figure (E), welding current Iw becomes with the waveform of amplitude W and cycle T f by the wavy vibration of triangle.In addition, different from the situation of Figure 11 of above-mentioned prior art, in wire sticking prevention control period Ta, do not produce short circuit.This point will be described later.At this, amplitude W (A) is the difference value between the maxima and minima of vibrational waveform, is the value determined according to above-mentioned amplitude setting signal Wr.Cycle T f (ms) is the value determined according to above-mentioned cycle set signal Tfr.It is because due to the impact of the inductance of the reactor WL of Fig. 1 and the welding cable of outside, cause change to become slow that weldingvoltage Vw and welding current Iw becomes the wavy vibrational waveform of triangle.
In order to not have the front end that slag is attached to welding wire at the end of welding, need to realize following 3 important documents.
(1) by wire sticking prevention voltage setting signal Ear is set to vibrational waveform, the welding current Iw in wire sticking prevention control period Ta is set to the vibrational waveform of amplitude W and cycle T f.In the vibrational waveform of welding current Iw, in the half period that current value is little, temperature is lower, and the metal ingredient therefore outside welding wire does not almost melt.Even if in contrast, the flux constituent inside welding wire also can gasify and disappear at low temperatures.Its result, becomes and only exposes in the leading section of welding wire the state having metal ingredient.This state becomes the state identical with solid core welding wire.Further, in the half period that current value is large, owing to becoming high temperature, the metal ingredient melting of therefore exposing, forms molten drop.By this state repeatedly, thus terminate welding under the state of can not adhere to slag in the leading section of welding wire.The amplitude W of welding current Iw is 50 ~ 150A degree, and cycle T f is 2 ~ 8ms degree.If the kind being mixed with the welding wire of solder flux is different, then the kind etc. of diameter, viscosity, solder flux changes to some extent.Therefore, preferably amplitude W and/or cycle T f can be changed according to the kind of the welding wire being mixed with solder flux.
(2) vibrational waveform of the welding current Iw in wire sticking prevention control period Ta is set to the wavy or sinusoidal wave shape of triangle.This is because if square wave, then due to the change of arc force sharply, molten drop and molten bath become chaotic, and sputtering and weld appearance are deteriorated.Therefore, by curent change is set to stable triangular wave and sine wave, thus make the change of arc force become steady, the deterioration of generation and the weld appearance sputtered can be suppressed.Want the vibrational waveform of welding current Iw to be set to the wavy or sinusoidal wave shape of triangle, if the vibrational waveform of wire sticking prevention voltage setting signal Ear is set to trapezoidal wavy, triangle is wavy or sinusoidal wave shape.
(3) wire sticking prevention voltage setting signal Ear is set in the mode that can not produce short circuit in wire sticking prevention control period Ta between welding wire and molten bath.If produce short circuit in wire sticking prevention control period Ta, then the slag composition swimming in weld pool surface can be attached to the leading section of welding wire, damages the action effect of above-mentioned (1) item.Therefore, the generation preventing short circuit is needed.According to above-mentioned wire sticking prevention voltage bias values setting signal Esr, above-mentioned amplitude setting signal Wr and above-mentioned cycle set signal Tfr, setting wire sticking prevention voltage setting signal Ear.In order to not produce short circuit, the mean value of wire sticking prevention voltage setting signal Ear is set as the value larger than the value of above-mentioned constant voltage setting signal Ecr.
At moment t3, if feed speed Fw becomes 0, then arc length is elongated owing to lighting gradually, in moment t4 extinguishing arc.Therewith in linkage, as shown in this figure (D), weldingvoltage Vw increases gradually from moment t3, is sharply increased to non-load voltage value at moment t4, until moment t5 maintains.As shown in this figure (E), the welding current Iw until the moment t4 of electric arc extinguishing arc is energized, becomes 0 afterwards.
[embodiment 2]
In the invention of embodiment 1, wire sticking prevention control period Ta is set to set-point.In contrast, in the invention of embodiment 2, wire sticking prevention control period Ta is set to the cycle comprising the weldingvoltage Vw of given number of times and the vibrational waveform of welding current Iw.
Fig. 3 is the block diagram of the source of welding current of wire sticking prevention control method for implementing embodiments of the present invention 2.This figure corresponds to above-mentioned Fig. 1, gives same symbol, no longer repeat specification to same module.This figure has added cycle count circuit CT on the basis of Fig. 1, and the start-up circuit ON of Fig. 1 has been replaced to the 2nd start-up circuit ON2.Below, with reference to this figure, these modules are described.
Cycle count circuit CT, to weld commencing signal St and wire sticking prevention voltage setting signal Ear as input, to have exported becoming the time point of Low level from welding commencing signal St to the end cycle of the vibrational waveform of wire sticking prevention voltage setting signal Ear the cycle count signal Ct becoming High level in the time point short time of stipulated number.
2nd start-up circuit ON2 is to weld commencing signal St and above-mentioned cycle count signal Ct as input, if welding commencing signal St becomes High level, export the enabling signal On becoming High level, if cycle count signal Ct becomes High level, export the enabling signal On becoming Low level, and time point welding commencing signal St being become Low level to cycle count signal Ct becomes the time point of High level during as wire sticking prevention control period Ta, output becomes the wire sticking prevention control period signal Tas of High level.
Fig. 4 is the sequential chart of each signal in the source of welding current of Fig. 3 of wire sticking prevention control method for illustration of embodiments of the present invention 2.This figure (A) represents the time variations of welding commencing signal St, this figure (B) represents the time variations of the voltage setting signal Er of the output valve of the constant-voltage characteristic for setting the source of welding current, this figure (C) represents the time variations of the feed speed Fw of welding wire, this figure (D) represents the time variations of the weldingvoltage Vw applied between welding wire and mother metal, this figure (E) represents the time variations to the welding current Iw that electric arc is energized, the time variations of this figure (F) indication cycle count signal Ct.This figure corresponds to above-mentioned Fig. 2, no longer repeats same explanation.Below, with reference to this figure, different actions is described.
From the outside input welding commencing signal St of the source of welding current, if become High level, then become sign on, if become Low level, then become END instruction.In the figure, during becoming constant weld during moment t1 ~ t2, during moment t2 ~ t4, become wire sticking prevention control period Ta.
At moment t2, as shown in this figure (A), if welding commencing signal St becomes Low level (END instruction), then owing to exporting halt instruction to feed motor, therefore as shown in this figure (C), feed speed Fw slows down gradually because of inertia, becomes 0 and stop at moment t3.The output of the source of welding current is continued in during the wire sticking prevention control period Ta of moment t2 ~ t4.To describe how to determine this moment t4 later.
In addition, at moment t2, if welding commencing signal St becomes Low level, then, as shown in this figure (B), voltage setting signal Er becomes the value set according to wire sticking prevention voltage setting signal Ear, becomes vibrational waveform.As shown in this figure (B), wire sticking prevention voltage setting signal Ear becomes using the value of wire sticking prevention voltage bias values setting signal Esr as central value and with the waveform of the cycle of the amplitude of amplitude setting signal Wr and cycle set signal Tfr by the wavy vibration of rectangle.Therewith in linkage, as shown in this figure (D), weldingvoltage Vw becomes the waveform of the wavy vibration of triangle.Similarly, as shown in this figure (E), welding current Iw becomes the waveform with amplitude W and the wavy vibration of cycle T f triangle.Action effect when weldingvoltage Vw and welding current Iw becomes vibrational waveform is identical with Fig. 2.
From welding time point that commencing signal St becomes Low level at moment t2 to the moment t4 in cycle of vibrational waveform of voltage setting signal Er finishing given number of times, as shown in this figure (F), cycle count signal Ct becomes High level at short notice.Therewith in linkage, the output of the source of welding current stops.Its result, at moment t4, as shown in this figure (D), weldingvoltage Vw becomes 0V, and as shown in this figure (E), welding current Iw becomes 0A, and electric arc is forced extinguishing arc.This point is different from embodiment 1.
About above-mentioned given number of times, be set to that the moment t4 of the given number of times of the end cycle of vibrational waveform is roughly consistent with the moment t3 stopped because of the feeding caused by the inertia of welding wire.Therefore, according between the cycle T f of vibrational waveform and the lag phase of feed motor WM (during moment t2 ~ t3), given number of times is set as appropriate value.
According to above-mentioned embodiment 1 and 2, by wire sticking prevention voltage setting value is set to vibrational waveform, thus welding current is set to the wavy or sinuous vibrational waveform of triangle, wire sticking prevention voltage setting value is set as the value that can not be short-circuited during wire sticking prevention controls.By welding current is set to vibrational waveform, thus the flux constituent that can repeatedly produce inside welding wire gasifies and makes the state that the metal ingredient in outside exposes and the state making the metal ingredient melting of exposing, and terminates welding under the state of can not adhere to slag in the leading section of welding wire.By the vibrational waveform of welding current being set to the wavy or sinusoidal wave shape of triangle, thus the change of arc force can be made to become steady, the generation of sputtering can be reduced, weld appearance can be made better.By preventing the short circuit in wire sticking prevention control period, thus can prevent with short circuit in the situation of the leading section of welding wire attachment from the slag in molten bath.By these action effects, in the present embodiment, the front end attachment slag of the welding wire at the end of welding can be suppressed in the welding wire welding being mixed with solder flux, the starting the arc can be made to become better.
[embodiment 3]
In the invention of embodiment 3, the amplitude (amplitude setting signal Wr) of the wire sticking prevention voltage sets Ear value after have passed through given period (between antephase Ts) the time point (transferring to the time point of wire sticking prevention control period Ta) being switched to wire sticking prevention voltage setting value Ear from voltage setting signal Er and/or cycle (cycle set signal Tfr) are set to the value also larger than the value before given period.
Fig. 5 is the block diagram of the source of welding current of wire sticking prevention control method for implementing embodiments of the present invention 3.This figure corresponds to above-mentioned Fig. 1, gives same symbol, no longer explain over and over again same module.This figure has added initialization circuit TSR between the 2nd amplitude setting circuit WR2, the 2nd cycle set circuit TFR2 and antephase on the basis of Fig. 1, and the wire sticking prevention voltage setting circuit EAR of Fig. 1 has been replaced to the 2nd wire sticking prevention voltage setting circuit EAR2.Below, with reference to this figure, these modules are described.
2nd amplitude setting circuit WR2 exports predetermined 2nd amplitude setting signal Wr2.The value of the 2nd amplitude setting signal Wr2 is configured to the value also larger than the value of above-mentioned amplitude setting signal Wr.
2nd cycle set circuit TFR2 exports predetermined 2nd cycle set signal Tfr2.The value of the 2nd cycle set signal Tfr2 is configured to the value larger than the value of above-mentioned cycle set signal Tfr.
Between antephase, initialization circuit TSR exports setting signal Tsr between predetermined antephase.
2nd wire sticking prevention voltage setting circuit EAR2 is to weld between commencing signal St, wire sticking prevention voltage bias values setting signal Esr, amplitude setting signal Wr, cycle set signal Tfr, above-mentioned 2nd amplitude setting signal Wr2, above-mentioned 2nd cycle set signal Tfr2 and above-mentioned antephase setting signal Tsr as input, carry out following process, export wire sticking prevention voltage setting signal Ear.
1) from welding commencing signal St becomes the time point of Low level to according to during antephase, setting signal Tsr determines, export the overlapping wire sticking prevention voltage setting signal Ear becoming vibrational waveform with the amplitude determined according to amplitude setting signal Wr and the waveform of periodic vibration determined according to cycle set signal Tfr on the steady state value determined according to wire sticking prevention voltage bias values setting signal Esr.
2) then, having exported on the steady state value determined according to wire sticking prevention voltage bias values setting signal Esr overlapping with the amplitude determined according to the 2nd amplitude setting signal Wr2 and the waveform of periodic vibration determined according to the 2nd cycle set signal Tfr2 becomes the wire sticking prevention voltage setting signal Ear of vibrational waveform.
Fig. 6 is the sequential chart of each signal in the source of welding current of Fig. 5 of wire sticking prevention control method for illustration of embodiments of the present invention 3.This figure (A) represents the time variations of welding commencing signal St, this figure (B) represents the time variations of the voltage setting signal Er of the output valve of the constant-voltage characteristic for setting the source of welding current, this figure (C) represents the time variations of the feed speed Fw of welding wire, this figure (D) represents the time variations of the weldingvoltage Vw applied between welding wire and mother metal, and this figure (E) represents the time variations to the welding current Iw that electric arc is energized.This figure corresponds to above-mentioned Fig. 2, no longer explains over and over again same action.Below, with reference to this figure, different actions is described.
At moment t2, as shown in this figure (A), if welding commencing signal St becomes Low level, be then transferred to wire sticking prevention control period Ta.If be transferred to wire sticking prevention control period Ta, then as shown in this figure (B), voltage setting signal Er becomes the value of the wire sticking prevention voltage setting signal Ear of vibrational waveform.Between the predetermined antephase of moment t2 ~ t21 in Ts, as shown in this figure (B), wire sticking prevention voltage setting signal Ear becomes using the value of wire sticking prevention voltage bias values setting signal Esr as central value and with the waveform of the wavy vibration of Periodic Rectangular of the amplitude of amplitude setting signal Wr and cycle set signal Tfr.Therewith in linkage, as shown in this figure (D), weldingvoltage Vw becomes the waveform of the wavy vibration of triangle.Similarly, as shown in this figure (E), welding current Iw becomes the waveform with amplitude W and the wavy vibration of cycle T f triangle.
During have passed through after the moment t21 of Ts between above-mentioned antephase, as shown in this figure (B), wire sticking prevention voltage setting signal Ear becomes using the value of wire sticking prevention voltage bias values setting signal Esr as central value and with the waveform of the wavy vibration of Periodic Rectangular of the amplitude of the 2nd amplitude setting signal Wr2 and the 2nd cycle set signal Tfr2.Therewith in linkage, as shown in this figure (D), weldingvoltage Vw becomes the waveform of the wavy vibration of triangle.Similarly, as shown in this figure (E), welding current Iw becomes the waveform with the 2nd amplitude W2 and the wavy vibration of the 2nd cycle T f2 triangle.At this, Wr2 > Wr and Tfr2 > Tfr, W2 > W and Tf2 > Tf.
Between above-mentioned antephase Ts be configured to the time point t21 that have passed through Ts between antephase to electric arc by the moment t4 of extinguishing arc during comprise the vibrational waveform in 1 ~ 5 cycle.In above-mentioned, describe Ts between antephase later during amplitude and period ratio antephase between the large situation of analog value in Ts, but also can be only increase a side.
According to above-mentioned embodiment 3, the amplitude of the wire sticking prevention voltage setting value after have passed through given period the time point being switched to wire sticking prevention voltage setting value from voltage setting signal and/or cycle set are become the value larger than the value before given period.Thus, in embodiment 3, except the effect of embodiment 1 and 2, also has following effect.That is, in embodiment 3, due to can make to electric arc by extinguishing arc just before the input thermal settings of welding wire must be larger, therefore, it is possible to the front end particle diameter optimization of welding wire at the end of making welding.Therefore, it is possible to optimize the starting the arc further.As shown in embodiment 1 and 2, when amplitude and the constant period of vibrational waveform, if increase amplitude and cycle, then easy generation from molten bath sputters, and therefore can not be set as large value.Its result, the front end particle diameter of welding wire also can become the value less than suitable size.This point is improved in embodiment 3.
[embodiment 4]
In the invention of embodiment 3, Ts between antephase is set to given period.In contrast, in the invention of embodiment 4, Ts between antephase is set as the period demand of the vibrational waveform of wire sticking prevention voltage setting signal.
Fig. 7 is the block diagram of the source of welding current of wire sticking prevention control method for implementing embodiments of the present invention 4.This figure corresponds to above-mentioned Fig. 3, gives same symbol, no longer explain over and over again same module.This figure has added the 2nd amplitude setting circuit WR2, the 2nd cycle set circuit TFR2 and leading cycle set circuit NSR on the basis of Fig. 3, and the wire sticking prevention voltage setting circuit EAR of Fig. 3 has been replaced to the 3rd wire sticking prevention voltage setting circuit EAR3.Below, with reference to this figure, these modules are described.
2nd amplitude setting circuit WR2 exports predetermined 2nd amplitude setting signal Wr2.The value of the 2nd amplitude setting signal Wr2 is set to the value also larger than the value of above-mentioned amplitude setting signal Wr.
2nd cycle set circuit TFR2 exports predetermined 2nd cycle set signal Tfr2.The value of the 2nd cycle set signal Tfr2 is set to the value also larger than the value of above-mentioned cycle set signal Tfr.
Leading cycle set circuit NSR exports predetermined leading cycle set signal Nsr.
3rd wire sticking prevention voltage setting circuit EAR3 will weld commencing signal St, wire sticking prevention voltage bias values setting signal Esr, amplitude setting signal Wr, cycle set signal Tfr, above-mentioned 2nd amplitude setting signal Wr2, above-mentioned 2nd cycle set signal Tfr2 and above-mentioned leading cycle set signal Nsr as input, carry out following process, export wire sticking prevention voltage setting signal Ear.
1) the time point becoming Low level from welding commencing signal St to terminate the number of times determined according to leading cycle set signal Nsr wire sticking prevention voltage setting signal Ear vibrational waveform cycle during, export wire sticking prevention voltage setting signal Ear, this wire sticking prevention voltage setting signal Ear is overlapping on the steady state value determined according to wire sticking prevention voltage bias values setting signal Esr becomes vibrational waveform with the amplitude determined according to amplitude setting signal Wr and the waveform of periodic vibration determined according to cycle set signal Tfr.
2) then, export wire sticking prevention voltage setting signal Ear, this wire sticking prevention voltage setting signal Ear is overlapping on the steady state value determined according to wire sticking prevention voltage bias values setting signal Esr becomes vibrational waveform with the amplitude determined according to the 2nd amplitude setting signal Wr2 and the waveform of periodic vibration determined according to the 2nd cycle set signal Tfr2.
Sequential chart for illustration of each signal in the source of welding current of Fig. 7 of the wire sticking prevention control method of embodiments of the present invention 4 is identical with above-mentioned Fig. 6.Wherein, Ts between antephase is only had to be the period demand this point difference determined according to leading cycle set signal Nsr.In addition, the action effect of embodiment 4 is also identical with embodiment 3.
[embodiment 5]
The invention of embodiment 5 this welding terminate on once welding start dwell time be more than fiducial time time this wire sticking prevention voltage setting value is set to vibrational waveform, when dwell time is less than the said reference time, this wire sticking prevention voltage setting value is set to steady state value.
Fig. 8 is the block diagram employing the welder of robot of the wire sticking prevention control method for implementing embodiments of the present invention 5.This figure corresponds to above-mentioned Fig. 1, gives same symbol, no longer explain over and over again same module.This figure has added robot controller RC on the basis of Fig. 1, and the wire sticking prevention voltage setting circuit EAR of Fig. 1 has been replaced to the 4th wire sticking prevention voltage setting circuit EAR4.Below, with reference to this figure, these modules are described.
This figure is the use of the situation of the welder of robot, and welding torch 4 and feed motor WM are equipped on robot (omitting diagram).
Robot controller RC controls according to the operation procedure of the action teaching robot (omitting diagram) in advance, and carries out following process, exports welding commencing signal St and dwell time judgment signal Std.
1) according to operation procedure, the welding torch 4 being equipped on robot is made to move to this welding start position, if reach, then welding commencing signal St is set to High level to export, welding torch 4 is moved along sealing wire weld, if welding torch 4 arrives this welding end position, then welding commencing signal St is set to Low level to export.
2) if welding torch 4 arrives this welding start position, then based on operation procedure, calculating this welding terminates to welding the dwell time Td starting next time, when this dwell time Td is more than fiducial time, be output into the dwell time judgment signal Std of High level, when this dwell time Td is less than fiducial time, be output into the dwell time judgment signal Std of Low level.
4th wire sticking prevention voltage setting circuit EAR4 is using above-mentioned welding commencing signal St, wire sticking prevention voltage bias values setting signal Esr, amplitude setting signal Wr, cycle set signal Tfr and above-mentioned dwell time judgment signal Std as input, carry out following process, export wire sticking prevention voltage setting signal Ear.
1) time point of Low level is become at welding commencing signal St, when dwell time judgment signal Std is High level, export wire sticking prevention voltage setting signal Ear, the waveform of this wire sticking prevention voltage setting signal Ear overlapping periodic vibration determined with the amplitude determined according to amplitude setting signal Wr and cycle set signal Tfr on the steady state value determined according to wire sticking prevention voltage bias values setting signal Esr and form vibrational waveform.
2) become the time point of Low level at welding commencing signal St, when dwell time judgment signal Std is Low level, export the wire sticking prevention voltage setting signal Ear becoming steady state value determined according to wire sticking prevention voltage bias values setting signal Esr.
Fig. 9 be for illustration of embodiments of the present invention 5 wire sticking prevention control method, dwell time Td be more than fiducial time time Fig. 8 welder in the sequential chart of each signal.This figure (A) represents the time variations of welding commencing signal St, this figure (B) represents the time variations of the voltage setting signal Er of the output valve of the constant-voltage characteristic for setting the source of welding current, this figure (C) represents the time variations of the feed speed Fw of welding wire, this figure (D) represents the time variations of the weldingvoltage Vw applied between welding wire and mother metal, this figure (E) represents the time variations to the welding current Iw that electric arc is energized, and this figure (F) represents the time variations of dwell time judgment signal Std.This figure corresponds to above-mentioned Fig. 2, no longer explains over and over again same action.Below, with reference to this figure, different actions is described.
At moment t2, if welding torch 4 arrives this welding end position, then the mobile of welding torch 4 stops, and as shown in this figure (A), welding commencing signal St becomes Low level.The time point of Low level is become at welding commencing signal St, as shown in this figure (F), dwell time judgment signal Std is High level, and therefore as shown in this figure (B), voltage setting signal Er becomes the value of the wire sticking prevention voltage setting signal Ear of vibrational waveform.The action of each signal in the wire sticking prevention control period Ta of moment t2 ~ t5 is identical with Fig. 2.
If terminate at moment t5 wire sticking prevention control period Ta, then welding torch 4 starts the movement to welding start position next time.Then, at moment t6, if welding torch 4 arrives welding start position next time, then welding torch 4 stops, and as shown in this figure (A), welding commencing signal St becomes High level.Therewith in linkage, as shown in this figure (C), feed speed Fw becomes steady state value, start the feeding of welding wire 1, as shown in this figure (D), apply weldingvoltage Vw, as shown in this figure (E), welding electric current I w is energized, carries out the striking of electric arc.As shown in this figure (B), voltage setting signal Er becomes the value of constant voltage setting signal Ecr at moment t5.
In the figure, dwell time Td becomes time the moment t2 to the moment t6 becoming High level of Low level from welding commencing signal St.This dwell time Td can calculate from operation procedure.Strictly, welding end time point be electric arc by the moment t4 of extinguishing arc, but due to the time of moment t2 ~ t4 be the time being short to 100ms degree, even if therefore welding end time point is set to moment t2 and is not also had large difference.
Figure 10 is the sequential chart of each signal in the welder of Fig. 8 when being less than fiducial time for illustration of the dwell time Td of the wire sticking prevention control method of embodiments of the present invention 5.This figure (A) represents the time variations of welding commencing signal St, this figure (B) represents the time variations of the voltage setting signal Er of the output valve of the constant-voltage characteristic for setting the source of welding current, this figure (C) represents the time variations of the feed speed Fw of welding wire, this figure (D) represents the time variations of the weldingvoltage Vw applied between welding wire and mother metal, this figure (E) represents the time variations to the welding current Iw that electric arc is energized, and this figure (F) represents the time variations of dwell time judgment signal Std.This figure corresponds to above-mentioned Fig. 9, to same action no longer repeat specification.Below, with reference to this figure, different actions is described.
At moment t2, if welding torch 4 arrives this welding end position, then the mobile of welding torch 4 stops, and as shown in this figure (A), welding commencing signal St becomes Low level.The time point of Low level is become at welding commencing signal St, as shown in this figure (F), because dwell time judgment signal Std is different from Fig. 9, it is Low level, therefore, as shown in this figure (B), voltage setting signal Er becomes the steady state value set according to wire sticking prevention voltage bias values setting signal Esr.That is, in the figure, the wire sticking prevention voltage setting signal Ear during moment t2 ~ t5 is different from Fig. 9, can not become vibrational waveform.Therefore, the waveform of the weldingvoltage Vw shown in this figure (D) and the welding current Iw shown in this figure (E) also can not become vibrational waveform.This action is identical with the prior art illustrated in fig. 11.
In the figure, dwell time judgment signal Std is Low level, and therefore the dwell time Td of moment t2 ~ t6 is shorter than the dwell time of Fig. 9.
In case of fig. 10, when dwell time Td is less than fiducial time, once weld sart point in time t6 upper, the front telomere of welding wire does not also solidify, and is in molten condition.Therefore, even if be attached with slag, it also can not be fixed in front end, therefore when welding beginning, can not hinder the striking of electric arc when welding wire front end contacts with mother metal.On the other hand, if weldingvoltage Vw and welding current Iw is set to vibrational waveform in wire sticking prevention control period Ta, then compared with not being set to the situation of vibrational waveform, the trend that the generation with sputtering has increased slightly.Therefore, when dwell time Td is less than fiducial time, weldingvoltage Vw and welding current Iw can not be set to vibrational waveform.When Fig. 9, when dwell time Td is more than fiducial time, once weld sart point in time t6 upper, the front telomere of welding wire solidifies.Therefore, if the weldingvoltage Vw in wire sticking prevention control period Ta and welding current Iw is not set to vibrational waveform, then slag is immobilized after being attached to the front end of welding wire, and therefore the striking of electric arc can failure.Therefore, when dwell time Td is more than fiducial time, the weldingvoltage Vw in wire sticking prevention control period Ta and welding current Iw is set to vibrational waveform.The time that the time that before being configured to terminate rear welding wire than welding fiducial time, telomere solidifies is also short.Such as be set to 1 ~ 3 second degree fiducial time.Fiducial time can be set as appropriate value according to the diameter of welding wire.
In above-mentioned, describe the situation automatically being set dwell time judgment signal Std by robot controller RC, but also can by manually settings such as teaching machines.That is, when the welding of same workpiece repeatedly, as long as measure dwell time Td and set dwell time judgment signal Std according to this measured value.In addition, in above-mentioned, describe the situation of welder using robot, but also can be applied to and employ in the welder of Automatic Guided Vehicle.
According to above-mentioned embodiment 5, this welding terminate on once welding start dwell time be more than fiducial time time, this wire sticking prevention voltage setting value is set to vibrational waveform, when dwell time is less than fiducial time, this wire sticking prevention voltage setting value is set to steady state value.Thus, in embodiment 5, the situation that the sputtering generation in wire sticking prevention control period increases can also be suppressed except the effect of embodiment 1 ~ 4.
Symbol description
1 welding wire
2 mother metals
3 electric arcs
4 welding torches
5 feed rolls
CT cycle count circuit
Ct cycle count signal
DV drive circuit
Dv drive singal
E output voltage
EAR wire sticking prevention voltage setting circuit
Ear wire sticking prevention voltage setting signal
EAR2 the 2nd wire sticking prevention voltage setting circuit
EAR3 the 3rd wire sticking prevention voltage setting circuit
EAR4 the 4th wire sticking prevention voltage setting circuit
ECR constant voltage initialization circuit
Ecr constant voltage setting signal
ED output voltage detecting circuit
Ed voltage sense signal
ER voltage setting circuit
Er voltage setting signal
ESR wire sticking prevention voltage bias values initialization circuit
Esr wire sticking prevention voltage bias values setting signal
EV voltage error amplifying circuit
Ev voltage error amplifying signal
FC feeding control circuit
Fc feeding control signal
FR feed speed initialization circuit
Fr feed speed setting signal
Fw feed speed
Iw welding current
The leading cycle set circuit of NSR
The leading cycle set signal of Nsr
ON start-up circuit
On enabling signal
ON2 the 2nd start-up circuit
PM electric power main circuit
RC robot controller
St welds commencing signal
Std dwell time judgment signal
Ta wire sticking prevention control period
Tas wire sticking prevention control period signal
Td dwell time
The Tf cycle
Tf2 the 2nd cycle
TFR cycle set circuit
Tfr cycle set signal
TFR2 the 2nd cycle set circuit
Tfr2 the 2nd cycle set signal
Between Ts antephase
Initialization circuit between TSR antephase
Setting signal between Tsr antephase
Vw weldingvoltage
W amplitude
W2 the 2nd amplitude
WL reactor
WM feed motor
WR amplitude setting circuit
Wr amplitude setting signal
WR2 the 2nd amplitude setting circuit
Wr2 the 2nd amplitude setting signal
Claims (5)
1. a wire sticking prevention control method, feeding is mixed with the welding wire of solder flux, and carry out Isobarically Control based on voltage setting signal and export weldingvoltage and welding current, weld thus, if welding commencing signal becomes END instruction, then export halt instruction to feed motor, and described voltage setting signal is switched to wire sticking prevention voltage setting value from constant voltage setting value, thus terminating welding, the feature of this wire sticking prevention control method is
By described wire sticking prevention voltage setting value is set to vibrational waveform, thus described welding current is set to the wavy or sinuous vibrational waveform of triangle, described wire sticking prevention voltage setting value is set as the value that can not produce short circuit during described wire sticking prevention controls.
2. wire sticking prevention control method according to claim 1, is characterized in that,
Amplitude and/or the cycle of the vibrational waveform of described wire sticking prevention voltage setting value is changed according to the described kind being mixed with the welding wire of solder flux.
3. wire sticking prevention control method according to claim 1 and 2, is characterized in that,
By be switched to described wire sticking prevention voltage setting value from described voltage setting signal time point the described amplitude of described wire sticking prevention voltage setting value after given period and/or described cycle set be than value also large before described given period.
4. wire sticking prevention control method according to claim 1 and 2, is characterized in that,
By be switched to described wire sticking prevention voltage setting value from described voltage setting signal time point the described amplitude of described wire sticking prevention voltage setting value after period demand and/or described cycle set be than value also large before described period demand.
5. the wire sticking prevention control method according to any one of Claims 1 to 4, is characterized in that,
When this welding dwell time terminated to welding next time starts is more than fiducial time, this described wire sticking prevention voltage setting value is set to vibrational waveform, when described dwell time is less than described fiducial time, this described wire sticking prevention voltage setting value is set to steady state value.
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| JP2013-251953 | 2013-12-05 | ||
| JP2013251953A JP6308651B2 (en) | 2013-12-05 | 2013-12-05 | Anti-stick control method |
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| CN104690397A true CN104690397A (en) | 2015-06-10 |
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| JP (1) | JP6308651B2 (en) |
| CN (1) | CN104690397B (en) |
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| CN107962279A (en) * | 2017-11-08 | 2018-04-27 | 深圳市瑞凌实业股份有限公司 | The anti-sticking welding rod function control method of electric welding machine and electric welding machine |
| CN109128442A (en) * | 2018-08-24 | 2019-01-04 | 上海沪工焊接集团股份有限公司 | A kind of wire feed automatic cut-off system and its method |
| CN110340494A (en) * | 2018-04-03 | 2019-10-18 | 株式会社达谊恒 | Silk transmission device |
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Also Published As
| Publication number | Publication date |
|---|---|
| IN2014MU03862A (en) | 2015-10-09 |
| JP2015107512A (en) | 2015-06-11 |
| JP6308651B2 (en) | 2018-04-11 |
| CN104690397B (en) | 2018-10-02 |
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