CN102990201B - Welder - Google Patents
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- CN102990201B CN102990201B CN201210332583.9A CN201210332583A CN102990201B CN 102990201 B CN102990201 B CN 102990201B CN 201210332583 A CN201210332583 A CN 201210332583A CN 102990201 B CN102990201 B CN 102990201B
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Abstract
The invention provides the welder of the generation of a kind of growth that can realize stable molten drop and stable electric arc. Welder (100) possesses power circuit (102), power control (104). The following mode control power circuit (102) of power control (104): the 1st arc period (Ta1) at the initial stage of the arc period of following during short circuit after in, export high level of current, in the 2nd arc period (Ta2) in later stage of arc period, export with by arc current corresponding to the weldingvoltage of constant voltage control. Power control (104) also produces the mode control power circuit (102) of high level of current according to the waveform that stack increases and decreases repeatedly on the electric current of amplitude center. Power control (104) also makes the electric current increase and decrease of amplitude center according to reducing average voltage (Va) with the mode of the voltage difference of setting voltage (Vr). Thus, inferior in the situation that has changed setting voltage, the difference of eliminating rapidly average voltage and setting voltage becomes large, and prevents that electric arc is unstable.
Description
Technical field
The present invention relates to welder, particularly relate to and carry out the welder that CO2 welding connects.
Background technology
In JP 4-4074 communique (patent documentation 1), disclose between sacrificial electrode and mother metal and repeatedly carried outThe consumption electrode type arc welding method that short circuit and electric arc produce. This consumption electrode type arc welding method carries out molten drop repeatedlyForming process and molten drop are to the transient process of mother metal.
Figure 13 is the figure for the consumption electrode type arc welding method that repeatedly carries out short circuit and electric arc generation is described.
With reference to Figure 13, repeatedly carrying out in the consumption electrode type arc welding method that short circuit and electric arc produces, in orderRepeatedly carry out (a) of following explanation～process (f). (a) molten drop contacts with molten bath short circuit A-stage, (b) molten drop and moltenThereby the contact in pond become reliable molten drop to the short circuit state in mid-term of molten bath transition, (c) molten drop to pool side transition after at welding wireAnd the short circuit later stage state, (d) short circuit that in the molten drop between molten bath, have produced necking down become open circuit and produced electric arc state,(e) electric arc of the front end melting of welding wire and molten drop growth produce state, the growth of (f) molten drop and be about to and molten bath short circuit before electricityArc produces state.
[patent documentation 1] JP JP 4-4074 communique
No. 4702375 description of [patent documentation 2] JP patent
In the existing short circuiting arc welding shown in JP JP 4-4074 communique, systematicness ground produces electric arc and shortRoad. But, utilizing high electric current (diameter of welding wire is 1.2mm and the electric current that exceedes 200A) to connect by CO2 weldingWhen method is welded, in the droplet transfer of following short circuit, because electric arc counter-force molten drop is at welding wire top protuberance (Ga り on せ り),Arc duration is extended and is difficult to produce periodic short circuit, can produce brokenly electric arc and short circuit.
Thus, if the cycle of short circuit and electric arc changes brokenly, droplet size when short circuit becomes uncertain, welding beadThe uniformity variation of toe (beadtoe) portion.
In addition,, because high electric current acts on excessive arc force on irregular position to molten bath, therefore make molten bath becomeLarge and it is vibrated brokenly, particularly press molten bath to the opposition side of welding direction, thereby easily produce humping weld.
Particularly, in order to improve productivity, require speed of welding high, the impact because of the problems referred to above in high-speed welding causesThe deteriorated of welding quality become remarkable. In addition, for speed of welding being made as at a high speed, need to accelerate welding wire feeding speed to obtainThe deposited amount of the unit of getting. Follow in this, there is the relation that welding current uprises.
In addition, welder has while having set electric current or welding wire feeding speed mostly, can automatically determine recommendationThe function of voltage (also referred to as monobasic voltage). With respect to this, also there is operator when being much the result of observing welding to weldConnect voltage and be set as being different from the voltage of recommending voltage. But, if make setting voltage and rise on the ground with respect to recommend voltage extreme orDecline, electric arc easily becomes unstable.
In addition, the difference of average voltage and setting voltage is temporary transient in the time having changed setting voltage etc. becomes when large, and electric arc is also easyBecome unstable. The difference of average voltage and setting voltage refers to greatly, though change setting, average voltage (output voltage or electricityArc length degree) can correspondingly not change, represent to be difficult to adjust welding condition. Now, be to be difficult to pipe by adjusting setting voltageReason input heat or weld bead shape.
Summary of the invention
The object of the present invention is to provide the generation of a kind of growth that can realize stable molten drop and stable electric arcWelder.
Generally, the present invention is by using carbon dioxide as protective gas alternately short-circuit condition and electricity repeatedlyThe CO2 welding of arcuation state connects the welder that method is welded, and possesses: for providing between welding torch and mother metalThe power circuit of voltage; With the control part of voltage of controlling power circuit. Control part is controlled power circuit in the following manner:Output high level of current in the 1st arc period at the initial stage of the arc period of following after during short circuit, after arc periodIn the 2nd arc period of phase output with by arc current corresponding to the weldingvoltage of constant voltage control. Control part is also according at amplitudeThe waveform that on the electric current of center, stack increases and decreases repeatedly produces the mode of high level of current and controls power circuit. Control part also according toThe mode that voltage difference between the mean value of weldingvoltage and the voltage setting value of weldingvoltage reduces increases amplitude center electric currentSubtract.
Other aspects of the present invention be by use carbon dioxide as protective gas and alternately repeatedly short-circuit condition andThe CO2 welding of conditions at the arc connects the welder that method is welded, and possesses: for carrying between welding torch and mother metalThe power circuit of voltage supplied; With the control part of voltage of controlling power circuit. Control part is controlled power circuit in the following manner:In the 1st arc period at the initial stage of the arc period of following after during short circuit, export high level of current, at arc periodIn the 2nd arc period in later stage output with by arc current corresponding to the weldingvoltage of constant voltage control. Control part is also according to shakingThe waveform that on the electric current of width center, stack increases and decreases repeatedly produces the mode of high level of current and controls power circuit. Control part is also pressedThe mode reducing according to the difference between the mean value of weldingvoltage and the voltage setting value of weldingvoltage makes the 1st arc period increase and decrease.
Another aspect of the present invention be by use carbon dioxide as protective gas and alternately repeatedly short-circuit condition andThe CO2 welding of conditions at the arc connects the welder that method is welded, and possesses: power circuit, its for to welding torch withVoltage is provided between mother metal; And control part, it controls the voltage of power circuit. Control part is controlled described power supply in the following mannerCircuit: export high level of current in the 1st arc period at the initial stage of the arc period of following after during short circuit, in the electric arc phaseBetween the 2nd arc period in later stage in output with by arc current corresponding to the weldingvoltage of constant voltage control. Control part also according toThe waveform that stack increases and decreases repeatedly on the electric current of amplitude center produces the mode of high level of current and controls power circuit. Control partWhen also the difference between the mean value of weldingvoltage and the voltage setting value of weldingvoltage is the 1st scope, make according to voltage differenceThe electric current increase and decrease of amplitude center, is while being different from the 2nd scope of the 1st scope in voltage difference, increases according to voltage official post the 1st arc periodSubtract.
Preferred wave shape form is triangular wave or sine wave.
Preferably control part, in the case of the necking down of molten drop being detected in during short circuit, reduces the necking down of short circuit currentDetect and control.
(invention effect)
According to the present invention, connect in method at CO2 welding, by the electric current at the arc period initial stage stack withThe waveform that the amplitude of the size of certain frequency and applicable molten drop increases and decreases carrys out output current, thereby can realize stable molten dropGrowth. Thus, can not produce unwanted short circuit in the electric arc starting stage, can obtain high welding stability. In addition, at rootThe recommendation voltage setting according to welder has changed in the situations such as setting voltage, can eliminate rapidly average voltage and setting voltageDifference become large, can prevent that electric arc from becoming unstable.
Brief description of the drawings
Fig. 1 is the block diagram of the welder of embodiment 1.
Fig. 2 is the moving of weldingvoltage while having represented to weld in the welder of embodiment 1 and welding currentMake oscillogram.
The figure of the state of welding portion when Fig. 3 is the t=t3 that has represented Fig. 2.
The figure of the state of welding portion when Fig. 4 is the t=t4 that has represented Fig. 2.
The figure of the state of welding portion when Fig. 5 is the t=t5 that has represented Fig. 2.
The figure of the state of welding portion when Fig. 6 is the t=t7 that has represented Fig. 2.
Fig. 7 is the block diagram that has represented the structure of the welder 100A of embodiment 2.
Fig. 8 is the block diagram that has represented the structure of the welder 100B of embodiment 3.
Fig. 9 is the block diagram that has represented the structure of the welder 100C of embodiment 4.
Figure 10 is weldingvoltage, welding current, the control while having represented to weld in the welder of embodiment 4The movement oscillogram of signal.
Figure 11 has represented it is the block diagram that has represented the structure of the welder 100D of embodiment 5.
Figure 12 has represented it is the block diagram that has represented the structure of the welder 100E of embodiment 6.
Figure 13 is the figure for the consumption electrode type arc welding method that repeatedly carries out short circuit and electric arc generation is described.
Symbol description
1 welding wire; 2 mother metals; 3 electric arcs; 4 welding torches; 5 feed rolls; 6 molten drops; 7 molten baths; 100,100A～100E welder;102,102A power circuit; 104,104A～104E power control; 106 feed arrangements; AD arc detection circuitry; DR drivesMoving circuit; DVH voltage error distributor circuit; EH voltage amplifier circuit; EI current error amplifying circuit; FC feeding control circuit;FH frequency setting circuit; FR feed speed initialization circuit; G1R, G2R gain setting circuit; ID current detection circuit; IHCR amplitudeCenter current setting circuit; IR welding current initialization circuit; NA NAND circuit; ND necking down testing circuit; NOT circuit for reversing; R limitFlow resistor; SW external behavior commutation circuit; TM timer circuit; TR1, TR2 transistor; VA average voltage circuit; VD electricityPress testing circuit; VH voltage error circuit; VR weldingvoltage initialization circuit; VTN detection reference value initialization circuit; WH amplitude is setCircuit; WL1 reactor; WM feed motor.
Detailed description of the invention
Below, with reference to accompanying drawing, describe embodiments of the present invention in detail. In addition, in the drawings, to identical or appropriate section is attachedAdd prosign, and no longer repeat specification. In addition, the welding method of explanation is repeatedly short-circuit condition and electricity in the present embodimentThe welding method of arcuation state, is different from pulse arc welding method.
[embodiment 1]
Fig. 1 is the block diagram of the welder of embodiment 1.
With reference to Fig. 1, welder 100 comprises power circuit 102, power control 104, wire feed unit 106, welderingTorch 4.
Power control 104 is controlled as follows: control power circuit 102, the welding that makes to export to welding torch 4Electric current I w and weldingvoltage Vw become the value that is applicable to welding.
Wire feed unit 106 is to welding torch 4 feeding welding wires 1. Although not shown, the guarantor taking carbon dioxide as principal componentProtecting gas is to emit from the fore-end of welding torch 4. Between the outstanding welding wire 1 of the front end from welding torch 4 and mother metal 2, produce electric arc3, make welding wire 1 melting carry out welding base metal 2. Wire feed unit 106 comprises feed speed initialization circuit FR, feeding control circuitFC, feed motor WM, feed rolls 5.
Power circuit 102 comprise electric power main circuit PM, reactor WL1 and WL2, transistor T R1, voltage detecting circuit VD,Current detection circuit ID.
Electric power main circuit PM is taking source power supplies (not shown) such as 3 phase 200V as input, according to error amplification signal described laterEa carries out the output control based on inverter control, and output is applicable to welding current Iw and the weldingvoltage Vw of arc welding. AlthoughNot shown, but electric power main circuit PM is for example configured to and comprises: to source power supply carry out No. 1 rectifier of rectification, to after rectificationDirect current carry out level and smooth capacitor, the inverter circuit that is high-frequency ac by the DC converting after level and smooth, high-frequency ac fallenBe depressed into the high frequency transformer of the magnitude of voltage that is applicable to arc welding, to the high-frequency ac after step-down carry out rectification No. 2 rectifiers andTaking error amplification signal Ea as input and result based on carrying out pulse width modulation control drive above-mentioned inverter circuitDrive circuit.
Reactor WL1 and reactor WL2 make the output smoothing of electric power main circuit PM. With the reactor WL2 crystal that is connected in parallelPipe TR1. Transistor T R1 according to after become low level NAND (NAND) logic in the 2nd arc period illustrated in fig. 2Signal Na only ends in the 2nd arc period Ta2.
Feed speed initialization circuit FR output sets value suitable feed speed with predetermined Constant feeding rate and establishesDetermine signal Fr. Feeding control circuit FC with the feed speed of value that is equivalent to feed speed setting signal Fr to feed motor WMOutput is for the feeding control signal Fc of feeding welding wire 1. The rotation of the feed rolls 5 by wire feed unit 106, welding wire 1 warpCross in welding torch 4 and be fed, and mother metal 2 between produce electric arc 3.
Current detection circuit ID detects welding current Iw, output welding current detection signal Id. Voltage detecting circuit VD inspectionSurvey weldingvoltage Vw, and export weldingvoltage detection signal Vd.
Power control 104 is configured to and comprises: arc detection circuitry AD, timer circuit TM, with non-(NAND) circuitNA, circuit for reversing NOT, gain setting circuit G1R, amplitude center current setting circuit IHCR, frequency setting circuit FH, amplitude are establishedDetermine circuit WH, welding current initialization circuit IR, current error amplifying circuit EI, weldingvoltage initialization circuit VR, voltage error electricityRoad VH, voltage amplifier circuit EH, average voltage circuit VA, external behavior commutation circuit SW.
Arc detection circuitry AD, taking weldingvoltage detection signal Vd as input, becomes by the value of weldingvoltage detection signal VdFor situation more than threshold value, be judged as while having produced electric arc, output becomes the arc detection signal Ad of height (High) level. TimingDevice circuit TM, taking arc detection signal Ad as input, exports during arc detection signal Ad is low (Low) level and electric arcDetection signal Ad becomes the timer signal Tm of high level in becoming during predetermined that high level rises. NAND circuit NA connectsThe signal that receipts timer signal Tm is inverted by circuit for reversing NOT and arc detection signal Ad are as input, and output and non-Logical signal Na.
Weldingvoltage initialization circuit VR output (is equivalent to Fig. 2's by the weldingvoltage setting signal Vr of the settings such as operatorSetting voltage Vr). Average voltage circuit VA output detects the average voltage after weldingvoltage detection signal Vd equalizationSignal Va. Voltage error circuit VH calculates the poor of weldingvoltage setting signal Vr and average voltage detection signal Va, output electricityHold up difference signal Vh. Voltage error signal Vh is amplified to the feedback for carrying out electric power main circuit PM by voltage amplifier circuit EHThe voltage amplifier circuit of the operation voltage (voltage amplification signal Eh) of controlling.
Gain setting circuit G1R exports predetermined the 1st gain setting signal G1r. Amplitude center current setting circuitIHCR is using the 1st gain setting signal G1r and voltage error signal Vh as input, and output is as shown in the formula the amplitude center shown in (1)Current settings signal Ihcr.
Ihcr＝Ihcr0+G1r*Vh...(1)
At this, Ihcr represents amplitude center current settings signal, and Ihcr0 represents the reference amplitude center current settings of regulationSignal, G1r represents the 1st gain setting signal, Vh represents voltage error signal. G1r for example can be made as 10～50 (A/V). This tableShow with respect to voltage deviation 1V, the amplitude of variation of amplitude center current settings signal Ihcr is 10～50A.
Frequency setting circuit FH exports predetermined frequency setting signal Fh. Amplitude setting circuit WH output pre-determinesAmplitude setting signal Wh. Welding current initialization circuit IR is with amplitude center current settings signal Ihcr, frequency setting signal FhAnd amplitude setting signal Wh is for inputting, and exports welding current setting signal Ir. Current error amplifying circuit EI amplifies welding currentError between setting signal Ir and welding current detection signal Id, output current error amplification signal Ei.
External behavior commutation circuit SW receives timer signal Tm, current error amplifying signal Ei and voltage as inputAmplifying signal Eh.
External behavior commutation circuit SW is switched to input terminal a side in the time that timer signal Tm is high level, by electric currentError amplification signal Ei exports as error amplification signal Ea. Now, current error is fed back to electric power main circuit PM, thereforeCarry out constant current control.
External behavior commutation circuit SW is switched to input terminal b side in the time that timer signal Tm is low level, by voltageAmplifying signal Eh exports as error amplification signal Ea. By these modules, control welding current Iw. Now, voltage errorBe fed back to electric power main circuit PM, therefore carry out constant voltage control.
Fig. 2 is the moving of weldingvoltage while having represented to weld in the welder of embodiment 1 and welding currentMake oscillogram.
With reference to Fig. 1, Fig. 2, welding advances by Ts during short circuit repeatedly and arc period. At the beginning of arc period is divided intoThe 1st arc period Ta1 beginning and the 2nd arc period Ta2 in later stage.
During the short circuit of moment t0～t2, in Ts, welding wire 1 contacts with mother metal 2, thus short circuit current flow, at welding wire 1Front end produce Joule heat and the leading section of welding wire 1 becomes high temperature.
At moment t2, if droplet transfer of the leading section of welding wire 1 and produce electric arc, power control 104 is according to welderingConnect the situation that voltage rises rapidly, judge that electric arc has produced. According to this, control is switched to constant current control by power control 104System, is transitioned into the 1st arc period Ta1. Welding current rise until high level of current (amplitude center is amplitude center electric currentIhcr) till. Afterwards, as welding current during certain, flow through high level of current. This high level of current is not suppressed in and can producesThe current value of the protuberance degree of the molten drop that raw arc force causes. The welding current flowing through in the 1st arc period Ta1 is calledHigh level of current.
If set welding wire feeding speed or welding current (mean value) in welder 100, corresponding recommendation voltage(monobasic voltage) Vcr (not shown) determines. With respect to this, operator can set according to weldingvoltage setting signal VrVoltage Vr.
And power control 104 is according to setting voltage Vr (corresponding to weldingvoltage setting signal Vr) and average electricalPress the voltage difference between Va (corresponding to average voltage detection signal Va), make amplitude center electric current I hcr increase and decrease.
During higher than setting voltage Vr, by reducing amplitude center electric current I hcr, thereby can prevent weldering at average voltage VaSilk is in excessively melting of arc period initial stage (the 1st arc period Ta1), in arc period rear half stage (the 2nd arc period Ta2)Under constant voltage control, output voltage easily declines.
On the contrary, at average voltage Va during lower than setting voltage Vr, by improving amplitude center electric current I hcr, thereby at electric arcIn the initial stage of that (the 1st arc period Ta1) makes the abundant melting of welding wire during this time, in the perseverance of arc period rear half stage (the 2nd arc period Ta2)Under pressure-controlled, output voltage easily rises.
And then, in the example of Fig. 2, the waveform (for example triangular wave) that has superposeed in high level of current and increased and decreased. In addition,Even the waveform that stack does not increase and decrease in high level of current, as mentioned above, also can make electrocardio in amplitudeStream Ihcr increases and decreases and sets it as high level of current. But, increase and decrease waveform by stack and can obtain the more welding of high-quality.
The melting speed Vm of welding wire can be expressed as Vm=α I+ β I2R. At this, α, β represent coefficient, and I represents welding current, RRepresent the resistance value of welding wire from the outstanding part of the contact chip of welding torch front end (outstanding length). Known, if welding current I is increasedAdd, the melting speed Vm of welding wire also can become large.
But, if increase welding current I, also can increase the arc force upwards of molten drop effect. Arc force and weldingElectric current I square proportional. On the other hand, due to also to molten drop effect gravity, therefore with gravity and the lucky balance of arc forceCurrent value is boundary, if current value is large, effect power upwards, if current value is little, acts on downward power. If at welding current IUpper stack alternating current, alternately acts on power upwards and downward power to molten drop. Present inventor finds, with entiretyIncrease when electric current comes continuously power upwards of molten drop effect and compare, by such increase and decrease electric current alternately to molten drop effect upwardsOr downward power, molten drop is more stable, can reduce sputter. Therefore, in the present embodiment, increase and decrease electricity in the 1st arc periodStream, realizes the stable and interim growth of molten drop.
During moment t3～t6 of the 1st arc period Ta1, explanation below stack on the electric current I hcr of amplitude centerTriangular wave.
The triangular wave of stack, centered by amplitude center electric current I hcr (200～400A), is the frequency of 2.5kHz～5kHz,The 1st arc period Ta1 is 0.3ms～3.0ms. Amplitude is ± 50～100A. For example, can be also by amplitude center electric current I hcrBe set as Ihcr=400A, frequency setting is that f=4kHz, the 1st arc period are set as Ta1=1.0ms, the triangular wave of stack is establishedBe decided to be for 4 cycles. In addition, the waveform of stack is not limited to triangular wave, can be also sinusoidal wave other waveforms that wait.
Below, describe the state of the welding portion in the 1st arc period Ta1 in detail.
(1) 0～1/2 cycle of triangular wave
The figure of the state of welding portion when Fig. 3 is the t=t3 that has represented Fig. 2. T=t3 is that the stack of triangular wave startsMoment.
With reference to Fig. 3, between the front end of welding wire 1 and mother metal 2, produce electric arc 3. The heat producing by electric arc 3, before welding wire 1End is heated, and leading section melting forms molten drop 6. By feed arrangement to mother metal 2 direction feeding welding wires 1.
Due to the electric current of stack, welding wire melting speed increases and molten drop becomes large, and the power that puts on molten drop becomes within 1/4 cycleFor maximum, molten drop swells accelerated because of electric arc counter-force. But, along with to 1/2 cycle and electric current reduce, electric arc counter-force is also fallenLow, therefore can prevent protuberance.
The figure of the state of welding portion when Fig. 4 is the t=t4 that has represented Fig. 2. T=t4 be through triangular wave 1/2The moment in cycle. As shown in Figure 4, the molten drop 6 of the leading section of welding wire 1 is grown a bit, becomes any the state of having swelled.
(2) 1/2～3/4 cycle of triangular wave
During this period, by power control 104, make welding current reduce more than the electric current I hcr of amplitude center,Further reduce the electric arc counter-force to molten drop.
(3) 3/4～1 cycle of triangular wave
Within 3/4～1 cycle of triangular wave, from the downside peak value of triangular wave to amplitude center electric current I hcr, again make welderingConnecing electric current increases.
The figure of the state of welding portion when Fig. 5 is the t=t5 that has represented Fig. 2. T=t5 is through 1 week of triangular waveThe moment of phase. As shown in Figure 5, by reducing electric arc counter-force, act on the gravity of molten drop 6 and electric arc counter-force just in equilibrium-likeState. Thus, eliminate the protuberance of molten drop 6, in the sagging state of molten drop 6.
And stipulated number is superimposed upon the triangular wave of explanation in (1)～(3) on the electric current I hcr of amplitude center repeatedly.Thus, prevent the protuberance that electric arc counter-force causes and slowly increase droplet size, forming the molten drop of desired size.
In addition, in order easily to carry out the stack of triangular wave, the inductance value WL1 of the 1st arc period Ta1 is less than the next the 2ndThe inductance value of arc period Ta2 (inductance value is WL1+WL2).
Below, describe the state of the welding portion in the 2nd arc period Ta2 in detail.
Referring again to Fig. 2, at moment t2, finish the 1st arc period Ta1, transfer to the 2nd arc period Ta2. At the 2nd electricityDuring arc, in Ta2, power control 104 increases the inductance value of power circuit 102, in order to carry out arc length control, will controlSystem is switched to constant voltage control from constant current control. This switches in Fig. 1 and is equivalent to external behavior commutation circuit SW to switch from terminal aTo terminal b. Because inductance is large, therefore welding current reduces lentamente along with electric arc load. In addition, weldingvoltage also lentamenteReduce.
The figure of the state of welding portion when Fig. 6 is the t=t7 that has represented Fig. 2.
As shown in Figure 6, the molten drop forming in the 1st arc period Ta1 can not swell, and in the 2nd arc period Ta2, increasesSome time, close to pool side. Prevent the variation of the arc length causing because of protuberance and adjust electricity by constant voltage controlArc length degree, the variation of arc force is slower, therefore makes the situation of molten bath vibration less. And, due to welding current lentamenteReduce, therefore fully carry out to the heat input of mother metal, the fusion of the toe portion of welding bead becomes good.
At the moment of Fig. 2 t8, if molten drop contacts with molten bath and produces short circuit, weldingvoltage can sharply decline. The electricity of Fig. 1Source control device 104 because of this weldingvoltage sharply decline is judged as short circuit time, make welding electricity with the rate of climb of expectingStream increases. Because of the rising of welding current, to the top effect electromagnetic clamp power of molten drop, thereby produce necking section, molten drop 6 is to moltenPond 7 transition.
As described above, the welding method shown in embodiment 1 is that the CO2 welding that carries out low sputter control connectsMethod, is different from pulse arc welding method.
, the welding method shown in embodiment 1 is repeatedly the welding method of short-circuit condition and conditions at the arc. In this welderingConnect in method, if raising speed of welding and increase welding current, in droplet transfer region, weld short-circuit conditionRepeatedly irregular with conditions at the arc.
Therefore, in the welding method shown in embodiment 1, the high electricity of output in the 1st arc period Ta1 during fixingOrdinary telegram stream carries out constant current control in the 1st arc period Ta1, stack for example triangular wave of alternating current or sinusoidal wave week like thisThe low-frequency current of the fixed frequency that phase property changes. Thus, prevent that molten drop from being swelled because of electric arc counter-force, can realize stable meltingThe growth of dripping.
And, for the amplitude center of high level of current, (set letter corresponding to weldingvoltage according to setting voltage VrNumber Vr) and average voltage Va (corresponding to average voltage detection signal Va) between voltage difference, amplitude center electric current I hcr is increasedSubtract.
During higher than setting voltage Vr, by reducing amplitude center electric current I hcr, thereby prevent that welding wire from existing at average voltage Va(the 1st arc period Ta1) the transition melting of arc period initial stage, in the arc period constant voltage in later half (the 2nd arc period Ta2) stageControl the lower output voltage that easily reduces.
On the contrary, at average voltage Va during lower than setting voltage Vr, by improving amplitude center electric current I hcr, at arc periodInitial stage, (the 1st arc period Ta1) made the abundant melting of welding wire, in the arc period constant voltage control in later half (the 2nd arc period Ta2) stageThe lower output voltage that easily improves of system.
If through the 1st arc period Ta1,, in order to carry out arc length control in the 2nd arc period Ta2, will weldThe control of power supply is switched to constant voltage control from constant current control. The inductance value of the reactor of the source of welding current is set than the 1st electric arcTa1 is also large during this time, and welding current is reduced lentamente. Thus, the conversion of arc force becomes slowly, therefore makes the feelings of molten bath vibrationCondition tails off. And, because welding current reduces lentamente, therefore abundant to the input heat of mother metal, the toe portion of welding bead moltenClose good.
In above-mentioned embodiment 1, in the 2nd arc period Ta2 by the inductance value of the reactor of the source of welding currentSet also greatlyr than the 1st arc period Ta1, insert actual reactor WL2. Replace, also can be with the control of electronics modeReactor increases inductance value.
In above-mentioned embodiment 1, during short circuit, in Ts, can, under the state of constant voltage control, make Current riseTo expect value, or also can be switched to constant current control and make Current rise to expect value.
In addition, in above-mentioned embodiment 1, represented the example of triangular wave that superposes in high level of current, even if still existIn the situation of triangular wave of not superposeing, the voltage difference based on setting voltage Vr and average voltage Va changes high level of current, also canEnough prevent that electric arc from becoming unsettled situation.
[embodiment 2]
In embodiment 1, voltage difference based on setting voltage Vr and average voltage Va has changed high level of currentSize, but in embodiment 2, the voltage difference based on setting voltage Vr and average voltage Va changes the high level shown in Fig. 2During electric current (the 1st arc period Ta1).
Fig. 7 is the block diagram that has represented the structure of the welder 100A of embodiment 2. In the following description, only explanationBe different from the part of embodiment 1, to the part identical with embodiment 1 additional prosign, no longer repeat specification.
With reference to Fig. 7, welder 100A comprise power circuit 102, power control 104A, wire feed unit 106,With welding torch 4.
Power control 104A replaces gain setting circuit G1R in the structure of the power control 104 shown in Fig. 1And comprise gain setting circuit G2R. Gain setting circuit G2R exports predetermined the 2nd gain setting signal G2r. Gain is establishedThe output of determining circuit G2R is imported into timer circuit TM.
In Fig. 1, amplitude center current setting circuit IHCR has exported amplitude center electric current based on voltage error signal VhSetting signal Ihcr, but in Fig. 7, amplitude center current setting circuit IHCR exports predetermined amplitude center electric current and establishesDetermine signal Ihcr.
In addition, the voltage error signal Vh of voltage error circuit VH output is imported into timer circuit TM, thereby replacesBe input to amplitude center current setting circuit IHCR.
Timer circuit TM is taking arc detection signal Ad, the 2nd gain setting signal G2r and voltage error signal Vh as defeatedEnter, output during arc detection signal Ad is low (Low) level and arc detection signal Ad only exist after becoming high levelIn the 1st arc period Ta1, become the timer signal Tm of high level. The 1st arc period Ta1 can be represented by following formula (2).
Ta1＝Ta10+G2r*Vh...(2)
At this, Ta1 represents the 1st arc period, and Ta10 represents benchmark the 1st arc period of regulation, and G2r represents the 2nd gainSetting signal, Vh represents voltage error signal. In addition, G2r can be made as for example 100～500 (μ s/V). This represents with respect to voltageThe conversion amplitude of deviation 1V the 1st arc period Ta1 is 100～500 μ s.
In addition, the structure of other parts of power control 104A is identical with the power control 104 shown in Fig. 1,Therefore no longer repeat specification.
The voltage difference of the welder 100A of embodiment 2 based on setting voltage Vr and average voltage Va changes the 1st electricityTa1 during arc, even the in the situation that of departing from setting voltage Vr in average voltage Va moment, identical with embodiment 1, also can preventOnly electric arc becomes unstable.
[embodiment 3]
In embodiment 1, be voltage error signal Vh according to voltage difference (Vr-Va), only increase and decrease amplitude center electric currentSetting signal Ihcr, in embodiment 2, according to this voltage difference, has has only increased and decreased the 1st arc period Ta1.
In embodiment 3, upper and lower threshold value is set in voltage difference, only increase and decrease amplitude center current settings signal IhcrUntil threshold value, only increase and decrease the 1st arc period Ta1 for the voltage difference that exceedes the voltage difference of threshold value or be less than threshold value.
Fig. 8 is the block diagram that has represented the structure of the welder 100B of embodiment 3. In the following description, only explanationBe different from the part of embodiment 1, to the part identical with embodiment 1 additional prosign, no longer repeat specification.
With reference to Fig. 8, welder 100B comprise power circuit 102, power control 104B, wire feed unit 106,With welding torch 4.
Power control 104B, on the basis of the structure of the power control 104 shown in Fig. 1, also comprises voltage mistakePoor distributor circuit DVH and gain setting circuit G2R. Gain setting circuit G2R exports predetermined the 2nd gain setting signalG2r。
Voltage error distributor circuit DVH accepts upper limit threshold Tv1 and lower threshold Tv2, voltage error signal Vh and weldingVoltage setting signal Vr, output voltage error distributes current signal Vri and voltage error to distribute time signal Vrt.
Voltage error distributes current signal Vri to replace voltage error signal Vh, together with the 1st gain setting signal G1r byBe input to amplitude center current setting circuit IHCR.
In addition, voltage error distributes time signal Vrt to be imported into timer electricity together with the 2nd gain setting signal G2rRoad TM.
By the recruitment from reference amplitude center current settings signal Ihcr0 of amplitude center current settings signal IhcrThe upper limit is made as Ih1. In formula (1), recruitment is G1r*Vh, therefore the predetermined upper limit threshold of voltage difference Vh=(Vr-Va)Value Tv1 can be represented by following formula (3).
Tv1＝Ih1/G1r...(3)
For example, in the time that the 1st gain setting signal G1r is 10A/V, be 50A, Tv1 if the upper limit of recruitment is made as to Ih15V.
Voltage error distributor circuit DVH distributes current signal Vri to export using voltage error signal Vh as voltage error,Until voltage error signal Vh arrives upper limit threshold Tv1. Now, identical with embodiment 1, change high electricity based on formula (1)The amplitude center of ordinary telegram stream.
In addition, voltage error distributor circuit DVH is in the time that voltage error signal Vh has exceeded upper limit threshold Tv1, by upper limit thresholdValue Tv1 distributes current signal Vri to export as voltage error, and by (voltage error signal Vh-upper limit threshold Tv1) conductVoltage distribution time signal Vrt exports. Now, the voltage with upper limit threshold Tv1 by the amplitude center change of high level of currentCorresponding voltage. And, for the variable quantity that exceedes upper limit threshold Tv1, as illustrated in embodiment 2, only the 1stArc period Ta1 changed in the corresponding time.
In addition, by the subtracting from reference amplitude center current settings signal Ihcr0 of amplitude center current settings signal IhcrA small amount of lower limit is made as Ih2. In formula (1), recruitment is G1r*Vh, and therefore voltage difference Vh='s (Vr-Va) is predeterminedLower threshold Tv2 can be represented by following formula (4).
Tv2＝Ih2/G1r...(4)
Voltage error distributor circuit DVH distributes current signal Vri to export using voltage error signal Vh as voltage errorUntil voltage error signal Vh arrives lower threshold Tv2. Now, identical with embodiment 1, change high based on formula (1)The amplitude center of current levels.
In addition, voltage error distributor circuit DVH is in the time that voltage error signal Vh is less than lower threshold Tv2, by lower thresholdTv2 distributes current signal Vri to export as voltage error, and by (voltage error signal Vh-lower threshold Tv2) conduct electricityHolding up difference joins time signal Vrt and exports. Now, the amplitude center of high level of current has been changed with lower threshold Tv2'sThe voltage that voltage is corresponding. And, for the variable quantity lower than lower threshold Tv2, as illustrated in embodiment 2, onlyWithin the 1st corresponding time of arc period Ta1, change.
In embodiment 3, be consistently combined and used in embodiment 1 explanation with the change degree of setting voltageThe change of the 1st arc period Ta1 of the increase and decrease of the amplitude center electric current I hcr of high level of current and explanation in embodiment 2,Prevent that electric arc from becoming unstable.
In addition, in embodiment 3, exemplified with the amplitude that increases and decreases high level of current in the time that voltage difference is arranged in prescribed limitElectrocardio stream Ihcr, change the 1st arc period Ta1 voltage difference is positioned at prescribed limit outside time, still also can change amplitude simultaneouslyCenter electric current I hcr and the 1st arc period Ta1.
[embodiment 4]
In embodiment 4, on the basis of the welding method illustrating in embodiment 1, by before producing electric arcDetect the necking section of molten drop, reduce sputter thereby reduce electric current before generation electric arc.
Fig. 9 is the block diagram that has represented the structure of the welder 100C of embodiment 4. In the following description, only explanationBe different from the part of embodiment 1, for the part identical with embodiment 1, additional prosign, no longer repeat specification.
With reference to Fig. 9, welder 100C comprises power circuit 102A, power control 104C, wire feed unit106 and welding torch 4.
Power circuit 102A, on the basis of the structure of the power circuit 102 shown in Fig. 1, also comprises transistor T R2 and limitFlow resistor R. Transistor T R2 and reactor WL1 and WL2 are in series inserted in the output of electric power main circuit PM. With crystalThe pipe TR2 current-limiting resistor R that is connected in parallel. The structure of other parts of power circuit 102A is identical with the power circuit of Fig. 1 102,Therefore no longer repeat specification.
Power control 104C, on the basis of the structure of the power control 104 shown in Fig. 1, also comprises necking down inspectionSlowdown monitoring circuit ND, necking down detection reference value initialization circuit VTN, drive circuit DR. The knot of other parts of power control 104CStructure is identical with the power control 104 of Fig. 1, therefore no longer repeat specification.
Figure 10 is weldingvoltage, welding current and the control while having represented to weld in the welder of embodiment 4The movement oscillogram of signal processed.
The difference of the waveform of the waveform of Figure 10 and the embodiment of Fig. 21 is, at moment t1a, if molten drop detectedNecking section, reduce welding current, after moment t2, produce electric arc.
The size of current value and the amount of sputter when having produced the electric arc of moment t2 are proportional, are therefore producing electric arcTime, if reduce current value, can reduce the generation of sputter.
With reference to Fig. 9, Figure 10, necking down detection reference value initialization circuit VTN exports predetermined necking down detection reference value letterNumber Vtn. Necking down testing circuit ND with this necking down detection reference value signal Vtn, weldingvoltage detection signal Vd illustrated in fig. 1 andWelding current detection signal Id has reached necking down detection reference value signal for input, the voltage rising value Δ V in during short circuitThe moment (moment t1a) of the value of Vtn becomes high level, and again producing electric arc, the value of weldingvoltage detection signal Vd becomes electricityIn the moment (moment t2) more than arc judgment value Vta, output becomes low level necking down detection signal Nd. Therefore, this necking down detectsDuring the high level of signal Nd, become Tn between necking down detection period.
In addition, the differential value of the weldingvoltage detection signal Vd in also can be during short circuit has arrived corresponding theretoIn the moment of the value of the necking down detection reference value signal Vtn setting, necking down detection signal Nd is changed over to high level. And, also canCalculate the resistance value of molten drop divided by the value of welding current detection signal Id with the value of weldingvoltage detection signal Vd, at this electricityThe differential value of resistance has arrived the moment of the value of the necking down detection reference value signal Vtn setting corresponding thereto, and necking down is examinedSurvey signal Nd and be transformed to high level. Necking down detection signal Nd is imported into electric power main circuit PM. Electric power main circuit PM examines in necking downDuring survey, in Tn, stop output.
Drive circuit DR (when non-necking section detects) output in the time that this necking down detection signal Nd is low level makes transistorThe driving signal Dr of TR2 in conducting state. Between necking down detection period, in Tn, driving signal Dr is low level, therefore transistorTR2 is in cut-off state. Its result, current-limiting resistor R is inserted into the electrical path of welding current Iw (from electric power main circuit PMTo the path of welding torch 4) on. The value of this current-limiting resistor R be set to 10 times of short circuit load (0.01～0.03 Ω left and right) withUpper large value (0.5～3 Ω left and right). Therefore the energy of, accumulating on the reactor of the direct current reactor in the source of welding current and cableAmount is by sudden discharge, and as shown in moment t1a～t2 of Figure 10, welding current Iw sharply reduces, and becomes little current value.
At moment t2, if short circuit becomes open circuit and again produces electric arc, weldingvoltage Vw becomes predetermined electric arcMore than judgment value Vta. Detect this situation, necking down detection signal Nd becomes low level, drives signal Dr to become high level. Its knotReally, transistor T R2 is in conducting state, after, become the control that utilizes the arc welding that Fig. 2 illustrates in embodiment 1. WithAfter the 1st arc period Ta1 and the 2nd arc period Ta2 in Fig. 2, illustrate, therefore no longer repeat specification.
The welder of embodiment 4 electric current when (moment t2) can reduce again to produce electric arc in the time again producing electric arcValue, therefore, except the effect that welder rose of explanation in embodiment 1, can also further reduce electric arc and produceSputter when beginning.
In addition, in embodiment 4, as the method that sharply reduces welding current Iw in the time detecting necking down, illustratedOn electrical path, insert the method for current-limiting resistor R. But except the method, can be also the output at welderBetween terminal, via the switch element capacitor that is connected in parallel, in the time necking down being detected, make switch element in conducting state, from electric capacityAfter device is switched on to discharge current, the method that welding current Iw is reduced rapidly.
[embodiment 5]
In embodiment 5, on the basis of the welding method illustrating in embodiment 2, by before producing electric arcDetect the necking down of molten drop, reduce sputter thereby reduce electric current before generation electric arc.
Figure 11 is the block diagram that has represented the structure of the welder 100D of embodiment 5. In the following description, only explanationBe different from the part of embodiment 2, to the part identical with embodiment 2 additional prosign, no longer repeat specification.
With reference to Figure 11, welder 100D comprises power circuit 102A, power control 104D, wire feed unit106 and welding torch 4.
Power circuit 102A, on the basis of the structure of the power circuit 102 shown in Fig. 7, also comprises transistor T R2 and limitFlow resistor R. Transistor T R2 and reactor WL1 and WL2 are in series inserted in the output of electric power main circuit PM. With crystalThe pipe TR2 current-limiting resistor R that is connected in parallel. The structure of other parts of power circuit 102A is identical with the power circuit of Fig. 7 102,Therefore no longer repeat specification.
Power control 104D, on the basis of the structure of the power control 104A shown in Fig. 7, also comprises necking downTesting circuit ND, necking down detection reference value initialization circuit VTN and drive circuit DR. Other parts of power control 104CFormation identical with the power control 104A of Fig. 7, therefore no longer repeat specification.
In addition, detect associated necking down testing circuit ND, necking down detection reference value initialization circuit VTN with necking down, drive electricityRoad DR action separately explanation in embodiment 4, therefore no longer repeat specification.
The electric current when electric arc of generation again when the welder 100D of embodiment 5 also can reduce again to produce electric arcValue, therefore, except the effect that welder rose of explanation in embodiment 2, can also further reduce electric arc and produceSputter when beginning.
[embodiment 6]
In embodiment 6, on the basis of the welding method illustrating in embodiment 3, by before producing electric arcDetect the necking down of molten drop, reduce sputter thereby reduced electric current before producing electric arc.
Figure 12 is the block diagram that has represented the structure of the welder 100E of embodiment 6. In the following description, only explanationBe different from the part of embodiment 3, to the part identical with embodiment 3 additional prosign, no longer repeat specification.
With reference to Figure 12, welder 100E comprises power circuit 102A, power control 104E, wire feed unit106 and welding torch 4.
Power circuit 102A, on the basis of the structure of the power circuit 102 shown in Fig. 8, also comprises transistor T R2 and limitFlow resistor R. Transistor T R2 and reactor WL1 and WL2 are in series inserted in the output of electric power main circuit PM. With crystalThe pipe TR2 current-limiting resistor R that is connected in parallel. The structure of other parts of power circuit 102A is identical with the power circuit of Fig. 8 102,Therefore no longer repeat specification.
Power control 104E, on the basis of the structure of the power control 104B shown in Fig. 8, also comprises necking downTesting circuit ND, necking down detection reference value initialization circuit VTN and drive circuit DR. Other parts of power control 104CStructure identical with the power control 104B of Fig. 7, therefore no longer repeat specification.
In addition, detect associated necking down testing circuit ND, necking down detection reference value initialization circuit VTN, drive with necking sectionMoving circuit DR action separately explanation in embodiment 4, therefore no longer repeat specification.
The electric current when electric arc of generation again when the welder 100E of embodiment 6 also can reduce again to produce electric arcValue, therefore, except the effect that welder rose of explanation in embodiment 3, can also further reduce electric arc and produceSputter when beginning.
In addition, in embodiment 6, exemplified with in the time that voltage difference is positioned at prescribed limit, make in the amplitude of high level of currentElectrocardio stream Ihcr increase and decrease, outside voltage difference is positioned at prescribed limit time, changes the 1st arc period Ta1, but also can change simultaneouslyAmplitude center electric current I hcr and the 1st arc period Ta1.
Finally, with reference to Fig. 1 etc., again sum up embodiment 1～6.
The welder of embodiment 1～6 is by using carbon dioxide as also alternately repeatedly short in protective gasThe CO2 welding of line state and conditions at the arc connects the welder that method is welded. Welder 100,100A～100E possesses: for power circuit 102, the 102A of voltage are provided between welding torch 4 and mother metal 2; With control power circuit 102,The power control 104 of the voltage of 102A, 104A～104E. Power control 104,104A～104E control power circuit102,102A, to export high level electricity in the 1st arc period Ta1 at the initial stage of the arc period of following after during short circuitStream, in the 2nd arc period Ta2 in later stage of arc period output with by electric arc electricity corresponding to the weldingvoltage of constant voltage controlStream. Power control 104,104A～104E also control 102,102A, so that stack increase and decrease repeatedly on the electric current of amplitude centerWaveform produce high level of current.
The power control 104 of embodiment 1,4,104C also increase and decrease amplitude center electric current, to reduce weldingvoltageVoltage setting value (setting voltage Vr) poor of mean value (average voltage Va) and weldingvoltage.
The power control 104A of embodiment 2,5, in 104D, control part also makes the 1st arc period increase and decrease, to subtractThe mean value (average voltage Va) of little weldingvoltage is poor with the voltage setting value (setting voltage Vr) of weldingvoltage.
Power control 104B, the 104E of embodiment 3,6 also the mean value (average voltage Va) of weldingvoltage withThe difference of the voltage setting value (setting voltage Vr) of weldingvoltage is the 1st scope (between upper limit threshold Th1 and lower threshold Th2)In situation according to voltage official post amplitude center electric current increase and decrease, and at mean value (average voltage Va) and the weldingvoltage of weldingvoltageThe difference of voltage setting value (setting voltage Vr) be that the 2nd scope that is different from the 1st scope is (under being greater than upper limit threshold Th1 or being less thanLimit threshold value Th2) situation under, according to voltage official post the 1st arc period increase and decrease.
Preferably, in welder 100,100A～100E, the waveform of increase and decrease is triangular wave or sine wave repeatedly.
Preferably in welder 100C～100E, power control 104C～104E as illustrated in fig. 10 thatSample, in the case of detecting the necking down of molten drop in during short circuit, the necking section that reduces short circuit current detects to be controlled.
Should think that this disclosed embodiment just illustrates in all respects, be not restrictive content. ThisBright scope is not to be represented by above-mentioned explanation, but represent according to the scope of patent request, attempt to comprise and patentAll changes in the meaning and the scope of the scope equalization of request.
Claims (5)
1. a welder, it is by using carbon dioxide as protective gas alternately short-circuit condition and electric arc shape repeatedlyThe CO2 welding of state connects method and welds, and this welder possesses:
Power circuit, it for providing voltage between welding torch and mother metal; With
Control part, it controls the voltage of described power circuit,
Described control part is controlled described power circuit in the following manner: the initial stage of the arc period of following after during short circuitThe 1st arc period in, for the protuberance that prevents from causing due to electric arc counter-force and form the molten drop of desired size and defeatedGo out high level of current, in the 2nd arc period in later stage of described arc period output with by the weldingvoltage pair of constant voltage controlThe arc current of answering,
Described control part produces the side of described high level of current according to the waveform that stack increases and decreases repeatedly on the electric current of amplitude centerFormula is controlled described power circuit,
The side that described control part reduces according to the voltage difference between the mean value of weldingvoltage and the voltage setting value of weldingvoltageFormula makes the electric current increase and decrease of described amplitude center.
2. a welder, it is by using carbon dioxide as protective gas alternately short-circuit condition and electric arc shape repeatedlyThe CO2 welding of state connects method and welds, and this welder possesses:
Power circuit, it for providing voltage between welding torch and mother metal; With
Control part, it controls the voltage of described power circuit,
Described control part is controlled described power circuit in the following manner: the initial stage of the arc period of following after during short circuitThe 1st arc period in, for the protuberance that prevents from causing due to electric arc counter-force and form the molten drop of desired size and defeatedGo out high level of current, in the 2nd arc period in later stage of described arc period output with by the weldingvoltage pair of constant voltage controlThe arc current of answering,
Described control part produces the side of described high level of current according to the waveform that stack increases and decreases repeatedly on the electric current of amplitude centerFormula is controlled described power circuit,
The side that described control part reduces according to the voltage difference between the mean value of weldingvoltage and the voltage setting value of weldingvoltageFormula makes described the 1st arc period increase and decrease.
3. a welder, it is by using carbon dioxide as protective gas alternately short-circuit condition and electric arc shape repeatedlyThe CO2 welding of state connects method and welds, and this welder possesses:
Power circuit, it for providing voltage between welding torch and mother metal; With
Control part, it controls the voltage of described power circuit,
Described control part is controlled described power circuit in the following manner: the initial stage of the arc period of following after during short circuitThe 1st arc period in, for the protuberance that prevents from causing due to electric arc counter-force and form the molten drop of desired size and defeatedGo out high level of current, in the 2nd arc period in later stage of described arc period output with by the weldingvoltage pair of constant voltage controlThe arc current of answering,
Described control part produces the side of described high level of current according to the waveform that stack increases and decreases repeatedly on the electric current of amplitude centerFormula is controlled described power circuit,
The voltage difference of described control part between the mean value of weldingvoltage and the voltage setting value of weldingvoltage is the 1st scopeTime, make the increase and decrease of described amplitude center electric current according to described voltage difference, be to be different from the of described the 1st scope in described voltage differenceIn the situation of 2 scopes, make described the 1st arc period increase and decrease according to described voltage difference, the 1st scope is positioned at upper limit threshold and lower limitBetween threshold value, the 2nd scope is the scope that is greater than upper limit threshold or is less than lower threshold.
4. according to the welder described in any one of claim 1～3, wherein,
Described waveform is triangular wave or sine wave.
5. according to the welder described in any one of claim 1～3, wherein,
Described control part reduces the necking down of short circuit current in the case of the necking down of molten drop being detected in during described short circuitDetect and control.
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| CN103071894B (en) * | 2013-01-09 | 2015-01-14 | 昆山安意源管道科技有限公司 | Metal-transfer gas-shielded welding control system and control method thereof |
| JP6154681B2 (en) * | 2013-07-02 | 2017-06-28 | 株式会社ダイヘン | Output control method of welding power source |
| JP6134601B2 (en) * | 2013-07-23 | 2017-05-24 | 株式会社ダイヘン | Necking detection control method for welding power source |
| CN104668736B (en) * | 2015-02-11 | 2016-06-22 | 上海广为焊接设备有限公司 | The circuit for remotely controlling of argon arc welding machine |
| US11845150B2 (en) * | 2019-04-30 | 2023-12-19 | Illinois Tool Works Inc. | Methods and apparatus to provide welding-type power and preheating power |
| JPWO2021140970A1 (en) * | 2020-01-06 | 2021-07-15 | ||
| CN111001897B (en) * | 2020-03-09 | 2020-07-07 | 杭州凯尔达电焊机有限公司 | Welding auxiliary circuit and welding power supply |
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