CN102470473A - Arc welding apparatus - Google Patents
Arc welding apparatus Download PDFInfo
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- CN102470473A CN102470473A CN2011800026383A CN201180002638A CN102470473A CN 102470473 A CN102470473 A CN 102470473A CN 2011800026383 A CN2011800026383 A CN 2011800026383A CN 201180002638 A CN201180002638 A CN 201180002638A CN 102470473 A CN102470473 A CN 102470473A
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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
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
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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
- B23K9/06—Arrangements or circuits for starting the arc, e.g. by generating ignition voltage, or for stabilising the arc
- B23K9/067—Starting the arc
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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
- B23K9/09—Arrangements or circuits for arc welding with pulsed current or voltage
- B23K9/091—Arrangements or circuits for arc welding with pulsed current or voltage characterised by the circuits
- B23K9/092—Arrangements or circuits for arc welding with pulsed current or voltage characterised by the circuits characterised by the shape of the pulses produced
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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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
- B23K2103/10—Aluminium or alloys thereof
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- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding Control (AREA)
- Generation Of Surge Voltage And Current (AREA)
Abstract
Disclosed is an arc welding apparatus incorporating a low inductance reactor having an inductance value of 100 microHz or less to improve arc starting performance by increasing the rate at which the current rises during the arc start, wherein a control unit controls the welding current with use of a first rising time and a second rising time so that the second rising time is longer than the first rising time, where: the first rising time is the time required for the welding current to reach the absolute value of the peak current after arc start; and the second rising time is the time required for the welding current to reach the absolute value of the peak current after the welding current has crossed zero and hence reversed its polarity in the steady welding period after arc start.
Description
Technical field
The present invention relates to the arc-welding apparatus that uses non-consumable electrode to weld.
Background technology
In recent years, consider the influence to environment, light weight and excellent aluminium and the magnesium material of recirculation property extensively are used in building or the vehicle etc.And, in it engages, utilize the alternating current arc welder mostly.In addition, the alternating current arc welder is alternately to repeat the device (for example with reference to patent documentation 1) that antipolarity and positive polarity are carried out arc welding.
Particularly, at the operation field of building building,, carry out more than the 300A and the weld job of the big electric current of the scope below the 500A in order to improve operating efficiency.
In the alternating current arc welder (for example TIG welder) of such in the past big electric current of output, the semi-conductive heat loss of installing inner groundwork is big.Therefore, in order to reduce conducting loss (conducting resistance of main transistor and electrical current are long-pending), need to adopt the slow semiconductor of switching speed.Its result, it is big that switching losses becomes, thereby can't improve inversion frequency.Therefore, formed the circuit structure that moves with the inversion frequency of lower frequency (about for example not enough 10kHz).Thus, break off, need to carry the big reactor of inductance value in order to prevent the electric arc in the low current zone (about for example not enough 10A).
Fig. 4 is the figure that representes the schematic configuration of arc-welding apparatus in the past, and Fig. 5 is the figure that changes the time of the welding current waveform in the arc-welding apparatus of representing in the past.Utilize Fig. 4 and Fig. 5, the action of habitual arc-welding apparatus is always in the past described.Below, with alternately repeat during the antipolarity with positive polarity during the alternating current arc welding tipping of the non-consumable electrode formula of welding be changed to example and describe.
In Fig. 4, the control part 20 that arc-welding apparatus 22 comprises current detecting part 4, high voltage generation portion 8, the efferent 19 that welds output that welding current is detected, be used for efferent 19 is controlled, be arranged on the reactor 21 between efferent 19 and the welding torch 10.At this, high voltage generation portion 8 applies high voltage between the electrode 9 and the mother metal 12 as the welding object thing that are contained on the welding torch 10.In addition, on arc-welding apparatus 22, be connected with the welding torch 10 that possesses electrode 9 and, between electrode 9 and mother metal 12, produce electric arc 11 and weld as the mother metal 12 of welding object thing.
In Fig. 5 of the time variation of representing welding current and high voltage generation signal, IP representes peak current value, and IS representes the initial current value.In addition, E1 representes that the moment that begins to weld promptly welds the zero hour, E2 represent by the moment that current detecting part 4 detects electric current be current detecting constantly.In addition, the rise time when TUP3 representes the starting the arc in the past, the rise time when TUP4 representes During normal welding in the past.In addition, I3 representes the current value before the polarity of welding current commutates from positive polarity toward antipolarity.
In Fig. 4,, offer the efferent 19 of arc-welding apparatus 22 from the source power supply input (for example using 200V etc.) that external equipments such as distribution board are supplied with.Efferent 19 is based on the welding control signal of control part 20 outputs, and through the conversion and control to drive about inversion frequency 10kHz, output is fit to the welding current or the weldingvoltage of welding.The welding current of efferent 19 output or weldingvoltage be through reactor 21 and smoothing offers welding torch 10 and mother metal 12, between the front end of electrode 9 and mother metal 12, produces electric arc 11, carries out the alternating current arc welding.
In addition, when inversion frequency is the 10kHz left and right sides, do not break off for electric arc does not take place under low current (for example about 10A), the inductance value of reactor 21 need be more than 200 μ H.Wherein, this inductance value is for example confirmed based on experiment or calculating etc.
At this, control part 20 produces signal and connects high voltage generation signal to high voltage generation portion 8 output HIGH voltages when the beginning starting the arc.Then, control part 20 as input, is detecting electric currents by current detecting part 4 with the current detection signal of current detecting part 4 output, and when current detecting part 4 is received the signal of the implication that detects electric current, breaks off high voltage and produce signal.
The voltage (for example 15kV) that voltage when high voltage generation portion 8 is used to produce than During normal welding is high, when the starting the arc, high voltage produces and between electrode 9 and mother metal 12, applies high voltage during signal is connected, and high voltage produces the signal off period and stops high-tension applying.
Then, utilize Fig. 5, time of the welding current waveform in the arc-welding apparatus is in the past changed describing.
At the welding E1 zero hour that begins to weld, the driving of control part 20 starting efferents 19 applies non-load voltage through efferent 19 between electrode 9 and mother metal 12.And then control part 20 is connected high voltage and is produced signal, applies the high voltage that is used for the starting the arc through high voltage generation portion 8.Then, produce electric arc, the current detecting that detects electric current at current detecting part 4 is E2 constantly, and control part 20 breaks off high voltages and produces signals, stops high-tension applying.
In starting the arc process, during the rise time TUP3 when the starting the arc, welding current rises with 500A/msec, arrives initial current value IS (for example 350A).
In addition, during During normal welding, during the rise time TUP4 that the zero passage from the polarity reversing of welding current the time begins constantly, welding current rises with 500A/msec, reaches the absolute value IP (for example 350A) of peak point current.
The rising of the welding current in as stated, during the rising of the welding current the during starting the arc and the During normal welding is by the inductance value decision of reactor 21.At this, rising means the recruitment of the welding current of the time per unit till reaching peak point current.
And the current-order that exchanges welding is generally pulse type, becomes pulse type in order to make actual current waveform, and it is generally acknowledged rises is the bigger the better.
When in arc-welding apparatus 22 in the past, being equipped with the big reactor of inductance value (for example more than the 200 μ H), can suppress the pulsation of welding current, the electric arc that prevents under low current (for example about 10A) breaks off upward effectively.But on the contrary, the rising of welding current is slack-off, that is, gradient is little and slow down, and has the problem of starting the arc property variation.In addition, even the instruction of giving rectangle as current-order, also because the inductance of reactor, the rising of the welding current of enforcement is slower than the current waveform of indication.And inductance value is big more, and this tendency is strong more.
In recent years, along with the appearance of new conversion regime, in the arc-welding apparatus (for example TIG welder etc.) of the non-consumable electrode formula that other big electric current of 500A level is used, can improve inversion frequency (for example reaching about 40kHz).
In the TIG welder that the inversion frequency by 40kHz drives, pulsation of current is little, and low current (for example about 10A) is difficult for producing electric arc down and breaks off.Therefore, can carry the little reactor of inductance value (for example below the 100 μ H).
For example, when lift-launch had the reactor of inductance value of 50 μ H, the rising of electric current became big (for example more than the 1500A/msec), and starting the arc property significantly improves.
Yet in the TIG welder of the rising of electric current big (more than the 1500A/msec), the rising of the electric current during During normal welding is big (more than the 1500A/msec) also.Hence one can see that, when the construction of big electric current (for example more than the 300A), in the operation of inserting filler wire, can't make filler wire fusion successfully, has the problem of operation property variation.
That is, if use the little reactor of inductance value, the raising of then starting the arc property, but the operation property variation in the During normal welding.
Technical literature formerly
Patent documentation
Patent documentation 1: japanese kokai publication hei 2-235574 communique
Summary of the invention
The also good arc-welding apparatus of operation property of the filler wire when the present invention provides the good and big electric current welding of a kind of arc starting performance.
Arc-welding apparatus of the present invention is that the absolute value of output peak point current is the arc-welding apparatus of 300A alternating-current pulse above and below the 1500A the non-consumable electrode formula of welding, and comprising: efferent, and it exports welding current; Control part, its each cycle of pressing the above-mentioned welding current of being controlled is to above-mentioned efferent output welding current control signal; And reactor; Its inductance value is more than the 10 μ H and below the 100 μ H; Above-mentioned welding current second rise time till the absolute value that reaches peak point current constantly of the zero passage during from the polarity reversing of above-mentioned welding current when the beginning starting the arc plays first rise time and the During normal welding after the starting the arc till the absolute value that reaches peak point current when above-mentioned control part uses the starting the arc is so that the mode longer than above-mentioned first rise time of above-mentioned second rise time controlled above-mentioned welding current.
According to this structure, the starting the arc property raising when construction of big electric current can be provided, inserting in the operation of filler wire operation property can variation, can realize making the arc-welding apparatus of the good working property of filler wire fusion successfully.
Description of drawings
Fig. 1 is the figure of the schematic configuration of the arc-welding apparatus in the expression embodiment 1 of the present invention.
Fig. 2 is the figure that changes the time of the welding current waveform in the expression embodiment 1 of the present invention.
Fig. 3 is the figure of relation of recruitment of welding current value of the time per unit of welding current value and the welding current of expression in the embodiment 1 of the present invention.
Fig. 4 is the figure that representes the schematic configuration of arc-welding apparatus in the past.
Fig. 5 is the figure that changes the time of the welding current waveform in the arc-welding apparatus of representing in the past.
The specific embodiment
Below, with reference to accompanying drawing, embodiment of the present invention is described.In following accompanying drawing, give identical symbol to identical construction unit, so omit explanation sometimes.
(embodiment 1)
Fig. 1 is the figure of the schematic configuration of the arc-welding apparatus in this embodiment of expression, and Fig. 2 is the figure that changes the time of the welding current waveform in this embodiment of expression.Fig. 3 is the figure of relation of recruitment of welding current value of the time per unit of welding current value and the welding current of expression in this embodiment.For the such arc-welding apparatus that constitutes of Fig. 1, adopt Fig. 2 and Fig. 3 that its action is described.
Below, with alternately repeat during the antipolarity with positive polarity during the alternating current arc welding tipping of the non-consumable electrode formula of welding be changed to example and describe.
In Fig. 1, the reactor 5 of the current detecting part 4 that arc-welding apparatus 1 comprises the efferent 2 that welds output, control part 3, detect welding current, the output smoothing that makes efferent 2, storage part 6, the selection portion 7 that the memory contents of storage part 6 is selected and the high voltage generation portion 8 of output HIGH voltage.At this, control part 3 comes efferent 2 is controlled to efferent 2 output control signals according to each control cycle.6 pairs of storage parts are stored with respect to recruitment of the welding current value of the time per unit of the welding current of welding current value etc.
In addition, efferent 2 comprises rectification part 14, partes glabra 15, conversion and control portion 13,16,2 rectification part 17 of transformer and 2 conversion and control portions 18.At this, partes glabra 15 makes the output smoothing of rectification part 14.Conversion and control is carried out in the output of 13 pairs of partes glabras 15 of conversion and control portion.Transformation is carried out in the output of 16 pairs of conversion and control portions 13 of transformer.2 rectification part 17 make the output smoothing of transformer 16.Conversion and control is carried out in the output of 18 pairs of 2 rectification part 17 of 2 conversion and control portions.
In addition, arc-welding apparatus 1 is connected with mother metal 12 as the welding object thing through cable 10a, 12a etc. and the welding torch that possesses electrode 9 10.And arc-welding apparatus 1 produces electric arc 11 and welds through supply capability between electrode 9 and mother metal 12 between electrode 9 and mother metal 12.
Among the Fig. 2 that changes in the time of expression welding current etc., IP representes the peak current value of welding current, and IS representes the initial current value of welding current.I1 is the current value in rising, and representes first current value littler than peak point current IP, and I2 is the current value in descending, and representes second current value littler than peak point current IP.
In addition, it is that the zero time of state till reaching initial current IS was first rise time that TUP1 representes from welding current, and TUP2 representes that becoming the zero time of the moment till reaching peak point current IP from the welding current switching-over was second rise time.TDN1 representes from the i.e. first fall time time of peak point current IP till being reduced to second current value I 2, TH represent as keep second current value I 2 during stipulated time.TDN2 represent first fall time TDN1 and i.e. second fall time time of stipulated time TH addition.
In addition, DI1 representes the recruitment of welding current value of the time per unit of first welding current, and DI2 representes the recruitment of welding current value of the time per unit of second welding current different with first welding current.
In addition, E1 representes that the moment that begins to weld promptly welds the zero hour, the moment that E2 representes to detect electric current be current detecting constantly, E3 representes that the moment that finishes during the starting the arc is the starting the arc finish time.
In Fig. 1, import the efferent 2 that (for example 200V) offers arc-welding apparatus 1 from the source power supply that external equipments such as distribution board are supplied with.And, convert DC voltage into through rectification part 14 that constitutes by diode etc. and the partes glabra 15 that constitutes by electrolytic capacitor etc.And, detect by 4 pairs of welding currents of current detecting part of CT formations such as (Current Transformer).In addition, be transfused to the output of current detecting part 4 by the control part 3 of CPU or DSP (Digital Signal Processor) and ADC formations such as (Analog to Digital Converter).And; Control part 3 synchronously generates the output order that is fit to welding with the control timing (for example the switch motion of converter regularly) of converter; Carry out the current feedback computing based on export target, calculate conversion and control portion 13 switch element the conducting width and export the welding current control signal.
And; Welding current control signal based on control part 3 outputs; Carry out conversion driving by PWM (Pulse Width Modulation) action or the IGBT (Insulated Gate Bipolar Transistor) of phase shift action drives, the conversion and control portion 13 of MOSFET (Metal-Oxide Semiconductor Field Effect Transistor) formations of etc.ing, will be transformed to the alternating voltage of the suitable high frequency that welds through transformer 16 by the DC voltage after rectification part 14 and partes glabra 15 conversion.
In addition, the non-load voltage of transformer 16 outputs is 80V.In addition, transformer 16 moves with the inversion frequency of 40kHz.In addition, converter comprises that IGBT constitutes with changing depressor, with the 40kHz action as the frequency of changing the depressor electric current.
And the alternating voltage of the high frequency of transformer 16 output is input to conversion and control portion 18 2 times by 2 rectification part 17 rectifications that are made up of diode etc.2 conversion and control portions 18 use IGBT etc., are made up of circuit such as full-bridge or half-bridges, and the output polarity of positive polarity and antipolarity is switched.
At this, positive polarity is meant that the movement of electrons direction in the arc-plasma is from the direction of electrode 9 to mother metal 12, and electrode 9 is that negative pole, mother metal are anodal situation.In addition, antipolarity is meant that the movement of electrons direction in the arc-plasma is from the direction of mother metal 12 to electrode 9, and electrode 9 is that positive pole, mother metal 12 are the situation of negative pole.
The welding current of the output of 2 conversion and control portions 18 or weldingvoltage be through reactor 5 smoothings, and offer welding torch 10.So,, carry out the alternating current arc welding producing electric arc 11 between as the mother metal 12 of welding object thing as the front end of the electrode 9 that constitutes by tungsten etc. of non-consumable electrode and aluminium etc.
In addition, the inductance value of reactor 5 for example is 50 μ H below 100 μ H, has used inductance value than based on the little structure of the reactor that is provided with on the arc-welding apparatus in the past 22 of Fig. 4 explanation 21.Thus, can make the recruitment of welding current value of the time per unit of welding current is 1500A/msec.
In addition; In the storage part 6 that constitutes by CPU etc.; With respect to same welding current value; As the recruitment of the welding current value of the time per unit of different welding currents, store the recruitment of welding current of time per unit of recruitment and second welding current of welding current of the time per unit of first welding current shown in Figure 3.In addition, the recruitment of the welding current of the time per unit of welding current also can not be two, and stores more than three.
In addition, the recruitment of welding current value of the time per unit of a welding current from storage part 6 in the recruitment of the welding current value of the time per unit of a plurality of welding currents of storage, is selected by the selection portion 7 that is made up of CPU etc., and to control part 3 inputs.In addition, the switching of this selection portion 7 can automatically be switched according to welding current setting or frequency setting or welding setting.Perhaps, also can manually switch according to the operator's that arc-welding apparatus 1 is operated hobby.
Change the high voltage generation portion 8 that depressor etc. constitutes by flybacking, during the high voltage from control part 3 outputs produced signal and connects, the high voltage (for example 15kV) of voltage in the time of will be than During normal welding was applied between electrode 9 and the mother metal 12.On the other hand, produce the signal off period, stop high-tension applying at high voltage from control part 3 outputs.
Then, use Fig. 2, the time of the welding current waveform till the rising of the interchange welding current pulse during During normal welding during the During normal welding after beginning during the starting the arc to the welding during the starting the arc changes and describes.
At the welding E1 zero hour that begins to weld, the driving of control part 3 starting conversion and control portions 13, (for example 80V) is applied between electrode 9 and the mother metal 12 with non-load voltage.And then control part 3 connects high voltage generation signal and to 8 outputs of high voltage generation portion, the high voltage (for example 15kV) that will be used for the starting the arc thus is applied between electrode 9 and the mother metal 12.Then, produce electric arc through this high voltage, flow through welding current, the moment that detects electric current at current detecting part 4 is current detecting E2 constantly, and control part 3 breaks off high voltage and produces signal and to 8 outputs of high voltage generation portion, stop high-tension applying thus.
In addition, when the starting the arc, during the first rise time TUP1 (for example 0.23msec), welding current is that 1500A/msec rises with the recruitment of the welding current of time per unit, arrives initial current value IS (for example 350A).
Then, during the moment that finishes during the starting the arc is the starting the arc finish time E3, transfer to during the starting the arc during the During normal welding.In addition, the end during the starting the arc also can be for having passed through the moment of predefined time (for example 100msec) from the starting the arc.In addition, the end during the starting the arc also can be that the output number of times to alternating-current pulse measures, when the pulse of output stipulated number, and the moment of for example having carried out the interchange output of 5 pulses.
In addition, during During normal welding in, carry out the switching-over that positive polarity and antipolarity change, the zero passage of welding current during from the polarity reversing of welding current constantly reaches peak point current IP (for example 350A) through the second rise time TUP2 (for example 0.85msec).
In addition, during the second rise time TUP2 in, welding current is reaching first current value I 1 (for example 50A) before, is that 500A/ms rises with the recruitment of the welding current of time per unit.Then, surpassing first current value I 1 (for example 50A) afterwards, rising with the few more mode of recruitment less than the welding current value of the big more time per unit of absolute value of 500A/msec and welding current.For example, the absolute value of welding current is based on the recruitment of the welding current of the time per unit of first welding current shown in the solid line among Fig. 3.
As stated, under the state that is connected with the little reactor of inductance value 5, during the starting the arc, under the effect of increasing of the welding current of the inductance value that depends on reactor 5, welding current is sharply risen, guarantee arc starting performance.Meanwhile, in During normal welding, the rising that makes welding current with the inductance value that does not rely on reactor 5 during compared with arc slowly mode apply the welding current instruction and control, can make the operation property of filler wire good thus.
In addition, in the second rise time TUP2, reach first current value I 1 (for example 50A) before, the recruitment of the welding current of time per unit is not to rise with 500A/msec, but rises with 1500A/msec.Surpassing first current value I 1 (for example 50A) afterwards, can control with the few more mode of increase of the welding current value of the big more time per unit of absolute value of welding current.
At this, 1500A/msec is the variable quantity of the time per unit of the maximum that can be exported by the arc-welding apparatus 1 of the inductance value of reactor 5 decision.So, can be during the initial stage that electric current increases, increase welding current with the variable quantity of the time per unit of maximum.
That is, arc-welding apparatus 1 of the present invention is that the absolute value of output peak point current is the arc-welding apparatus of 300A alternating-current pulse above and below the 1500A the non-consumable electrode formula of welding.And arc-welding apparatus 1 comprises that the efferent 2 of exporting welding current, control part 3 and the inductance value of exporting the welding current control signals to efferent 2 according to each cycle of the welding current of being controlled are more than the 10 μ H and the reactor 5 below the 100 μ H.The structure that the control part 3 of arc-welding apparatus 1 adopts is to use the first rise time TUP1 and the second rise time TUP2, so that the second rise time TUP2 mode longer than the first rise time TUP1 controlled welding current.At this, the first rise time TUP1 is when the starting the arc, and welding current begins the time till the absolute value that reaches peak point current after the starting the arc.When the second rise time TUP2 was the During normal welding after the starting the arc, the zero passage during from the polarity reversing of welding current is the time till the absolute value that reaches peak point current constantly.
According to this structure, when can being provided, the construction of big electric current improves starting the arc property, and inserting in the operation of filler wire operation property can variation, realizes making the arc-welding apparatus 1 of the good working property of filler wire fusion successfully.
In addition, the structure that control part 3 adopts also can for, the welding current that increases among the second rise time TUP2 is controlled as follows, that is, the absolute value of the welding current increase of the welding current value of ambassador's time per unit more is few more.
According to this structure, in During normal welding, the rising that makes welding current with the inductance value that does not rely on reactor 5 during compared with arc slowly mode apply the welding current instruction and control, so can make the operation property of filler wire good.
In addition; The structure that control part 3 adopts also can for, the welding current that increases among the second rise time TUP2 is controlled as follows, promptly; Before reaching first current value I 1; The constant mode of increase according to the welding current value that makes time per unit increases, and under the situation that has surpassed first current value I 1, the absolute value of the welding current increase of the welding current value of ambassador's time per unit more is few more.
According to this structure, when the starting the arc, can under the effect of increasing of the welding current of the inductance value that depends on reactor 5, welding current sharply be risen, guarantee arc starting performance, and when During normal welding, can make the operation property of filler wire good.
In addition, can to export the recruitment of the welding current of time per unit be the above and welding current below the 10000A/msec of 1000A/msec to efferent.And; The structure that adopts also can for; The recruitment of the welding current of the time per unit among the first rise time TUP1 is that 1000A/ms is above and below the 10000A/msec, the recruitment of the welding current of the time per unit among the second rise time TUP2 is more than the 10A/msec and below the 500A/msec.
According to this structure, when the starting the arc, can under the effect of increasing of the welding current of the inductance value that depends on reactor 5, welding current sharply be risen, guarantee arc starting performance, and when During normal welding, can make the operation property of filler wire good.
In addition, can to export the recruitment of the welding current of time per unit be the above and welding current below the 10000A/msec of 1000A/msec to efferent.And the recruitment of the welding current of the time per unit among the first rise time TUP1 is more than the 1000A/msec and below the 10000A/msec.The recruitment of the welding current that reaches first current value I 1 time per unit before among the second rise time TUP2 is more than the 1000A/msec and below the 10000A/msec.And the recruitment of the welding current of the time per unit under the situation that has surpassed first current value I 1 among the second rise time TUP2 is more than the 10A/msec and below the 500A/msec.
According to this structure, when the starting the arc, can under the effect of increasing of the welding current of the inductance value that depends on reactor 5, welding current sharply be risen, guarantee arc starting performance, and when During normal welding, can make the operation property of filler wire good.
In addition, the structure of employing also can for, efferent 2 comprises conversion and control portion 13, the inversion frequency of conversion and control portion 13 is that 40kHz is above and below the 1MHz.
According to this structure, further reduce pulsation of current, be difficult for producing electric arc down at low current (for example about 10A) and break off.
In addition; The structure that adopts also can for; The high-tension high voltage generation portion 8 that voltage when being used for when being included in the starting the arc between non-consumable electrode and welding object thing, applying than During normal welding is high carries out the starting the arc through between non-consumable electrode and welding object thing, applying high voltage.
According to this structure, can realize the better starting the arc, can not influence mother metal and electrode during the starting the arc.
As stated, near the rising of welding current constantly of the zero passage when commutating through strengthening produces electric arc and breaks off in the time of can preventing to commutate.In addition, in the arc-welding apparatus in the past 22 that utilizes Fig. 4 to explain, owing to the rising that determines the electric current of zero cross near by the inductance value of reactor 21, so can't strengthen the rising of zero cross near.
Then, utilize Fig. 2, exchanging forward, the time variation of welding current decline welding current waveform constantly describes.
As stated, the reduction of the decline through strengthening electric current, can with the current value before the switching-over promptly second current value I 2 set to such an extent that the current value I 3 (for example 200A) of Billy before with the switching-over in the arc-welding apparatus in the past 22 of Fig. 5 explanation is low.The semi-conductive switch of 2 converters of formation in the time of thus, can preventing to follow switching-over and the high surge voltage that produces causes semiconductor element damaged.
In addition, utilize the current value I 3 before the switching-over of the arc-welding apparatus in the past 22 that Fig. 5 explains, by the inductance value decision of reactor shown in Figure 4 21, owing to be by the reduction decision of the decline of electric current, so can't electric current sharply fallen after rise.
Then, utilize Fig. 2, the welding current waveform when switching to the recruitment of the welding current with a plurality of time per units of welding current and to them describes.
The storage part 6 of arc-welding apparatus 1; With respect to same welding current value; As the recruitment of the welding current value of the time per unit of different welding currents, store the recruitment of welding current of time per unit of recruitment and second welding current of welding current of the time per unit of first welding current shown in Figure 3.And the memory contents of storage part 6 is switched by selection portion 7 and is selected.
In example shown in Figure 3, show the recruitment of the welding current of the time per unit of comparing first welding current, the big situation of decline degree of the recruitment of the welding current of the time per unit of second welding current.
Consider that selection portion 7 selected the situation of recruitment of welding current of the time per unit of first welding current.At this moment, the rising of the welding current among the second rise time TUP2 is risen with the represented gradient of recruitment DI1 by the welding current of the time per unit of first welding current shown in Figure 2.On the other hand, consider that selection portion 7 selected the situation of recruitment of welding current of the time per unit of second welding current.At this moment, the rising of the welding current among the second rise time TUP2 is risen with the gradient by the recruitment DI2 of the welding current of the time per unit of second welding current shown in Figure 2.
In addition, compare the recruitment of welding current of the time per unit of first welding current, the decline degree of the recruitment of the welding current of the time per unit of second welding current is big.Hence one can see that, and the welding current of the recruitment DI2 of the welding current of the time per unit of second welding current of Fig. 2 slowly rises.And if the waveform of the rising of welding current slows down, then electric arc has range, and the operation property of filler wire improves.On the contrary, owing to have influence on centrality, so have the gradient of the fillet welding of being not suitable for.Thereby, be preferably based on welding object or welding condition etc., the suitable rising of storage respectively, the rising of selecting to be fit to is welded.
As stated, can switch the recruitment of welding current value of the time per unit of welding current through selection portion 7, can control the rising of the welding current among the second rise time TUP2 thus.Thus, the operation property of filler wire can be adjusted, multiple execution conditions and operator's hobby can be tackled.
In arc-welding apparatus of the present invention; Control part 3 is controlled as follows; That is, the welding current during with During normal welding reduces to second current value I 2 littler than peak current value IP from peak current value IP, after keeping 2 stipulated time of this second current value I TH, commutates.And the structure that control part 3 adopts does, so that first TDN1 fall time mode shorter than the second rise time TUP2 that reduces to till second current value I 2 from peak current value IP controlled.
According to this structure, can strengthen the reduction of the decline of electric current, be that second current value I 2 is set at lower than the current value I 3 before the switching-over in the arc-welding apparatus 22 in the past with the current value before the switching-over.The semi-conductive switch of 2 converters of formation in the time of thus, can preventing to follow switching-over and the high surge voltage that produces causes semiconductor element damaged.
In addition; The structure that control part 3 adopts is for control as follows; That is, when During normal welding, make welding current from the zero passage of peak value welding current IP when reaching the polarity reversing of welding current till constantly second fall time TDN2 shorter than the second rise time TUP2.
According to this structure, can strengthen the reduction of the decline of electric current, be that second current value I 2 is set at lower than the current value I 3 before the switching-over in the arc-welding apparatus 22 in the past with the current value before the switching-over.The semi-conductive switch of 2 converters of formation in the time of thus, can preventing to follow switching-over and the high surge voltage that produces causes semiconductor element damaged.
In addition; The structure that efferent 2 adopts does; The reduction that can realize the welding current of time per unit is the minimizing of the above and welding current below the 10000A/msec of 800A/msec, the reduction of the welding current of the time per unit among the first fall time TDN1, or the second fall time TDN2 in the reduction of welding current of time per unit be that 800A/msec is above and below the 10000A/msec.
According to this structure, can strengthen the reduction of the decline of electric current, be that second current value I 2 is set at lower than the current value I 3 before the switching-over in the arc-welding apparatus 22 in the past with the current value before the switching-over.The semi-conductive switch of 2 converters of formation in the time of thus, can preventing to follow switching-over and the high surge voltage that produces causes semiconductor element damaged.
In addition, the structure of employing does, comprising: with respect to same welding current value, store the storage part 6 of recruitment of welding current value of the time per unit of a plurality of different welding currents; In the recruitment of the welding current value of the time per unit of a plurality of welding currents of from storage part 6, storing, the selection portion 7 of the recruitment of the welding current value of the time per unit of a welding current of selection.
According to this structure, can switch the recruitment of welding current value of the time per unit of welding current through selection portion 7, can control the rising of the welding current among the second rise time TUP2 thus.Thus, the operation property of filler wire can be adjusted, multiple execution conditions and operator's hobby can be tackled.
In addition, in Fig. 2, peak current value IP is made as equal values in positive polarity side and antipolarity side is illustrated, but also can be made as different value.
In addition, the decline curve of electric current recruitment shown in Figure 3 can linear (1 formula) descend, and also can be non-linearly descends with the mode of multinomial (for example 2 formulas).
In addition, can also can as required intermediate point be set, make dropping characteristic non-linearly crooked with arbitrary value (for example 50A/msec) restriction lower limit (setting minimum).
In addition, in Fig. 2, the starting the arc is shown is illustrated from the initial example of antipolarity side, but also can be from the starting the arc of positive polarity side.
In addition, in Fig. 2, be that equal values is illustrated with initial current value IS and peak current value IP, but also can be different value.At this moment, the first rise time TUP1 can be made as TUP1=(TUP1 before the converting) * IS/IP that converses based on the ratio of initial current value IS and peak current value IP.
In addition, in this embodiment, utilize high voltage generation portion 8 to carry out the initial example of high frequency when the starting the arc has been described, but also can adopt contact initial.
In addition, in this embodiment, alternating current arc welding is illustrated, but also can be applied to the waveform that the pulse in the arc welding of non-consumable electrode formula of direct current is risen.
In addition, the recruitment of the welding current of the time per unit of the welding current when welding current rises, in this embodiment, having utilized in positive polarity side and antipolarity side is the decline curve of identical recruitment, but also can adopt different characteristic.
In addition, the example that the recruitment of the welding current of the time per unit of the welding current when the welding current rising has been described is switched in welding process in Fig. 2, but can be constant in the welding process playing the forearc setting also.
In addition, serve as that fixed value is illustrated arbitrarily in Fig. 2 with the peak current value of positive polarity and antipolarity, but also can be between the peak period in the welding current waveform of change.
In addition, last, the relation of the peak current value of welding current and the operation property of welding is shown in following table 1.In table, zero symbolic representation operation property is good, and * symbolic representation operation property is poor.△ symbolic representation operation property is poor slightly.
[table 1]
As stated, according to this embodiment, when can make starting the arc property good, the operation property of the welding when making During normal welding is also good.
As stated, the present invention is at the reactor that carries below the 100 little μ H of inductance value, and the electric current when strengthening the starting the arc rises and improves under the situation of starting the arc property, also so that second rise time mode longer than first rise time welding current is controlled.According to this control, even can provide when big electric current construction, operation property can variation yet in the operation of inserting filler wire, the arc-welding apparatus with good operation property.
Utilizability on the industry
As stated, even the present invention can provide when big electric current construction, operation property can variation yet in the operation of inserting filler wire, the arc-welding apparatus with good operation property.Thus, the for example factory construction industry of arc-welding apparatus conduct carrying out arc welding construction of the present invention etc. is particularly welded the arc-welding apparatus in the industry of producing to large-scale aluminium parts with big electric current, be useful on industry.
Symbol description
1 arc-welding apparatus
2 efferents
3 control parts
4 current detecting parts
5 reactors
6 storage parts
7 selection portions
8 high voltage generation portions
9 electrodes
10 welding torches
10a, 12a cable
11 electric arcs
12 mother metals
13 conversion and control portions
14 rectification part
15 partes glabras
16 transformers
17 2 rectification part
18 2 conversion and control portions
Claims (11)
1. arc-welding apparatus, the absolute value that is the output peak point current are the arc-welding apparatus of 300A alternating-current pulse above and below the 1500A the non-consumable electrode formula of welding, and comprising:
Efferent, it exports welding current;
Control part, its each cycle of pressing the said welding current of being controlled is to said efferent output welding current control signal; With
Reactor, its inductance value are more than the 10 μ H and below the 100 μ H,
Said control part utilizes first rise time and second rise time; According to making the mode longer of said second rise time said welding current is controlled than said first rise time; Said first rise time be when the starting the arc said welding current from the outset arc play the time till the absolute value that reaches peak point current, the zero passage when said second rise time is the During normal welding after the starting the arc during from the polarity reversing of said welding current is the time till the absolute value that reaches peak point current constantly.
2. arc-welding apparatus according to claim 1, wherein,
Said control part is controlled the said welding current that in said second rise time, increases as follows, that is, the absolute value of the said welding current increase of the welding current value of ambassador's time per unit more is few more.
3. arc-welding apparatus according to claim 2, wherein,
Said control part is controlled the said welding current that in said second rise time, increases as follows; Promptly; Before arriving first current value; The constant mode of increase according to the welding current value that makes said time per unit increases, and under the situation that has surpassed said first current value, the absolute value of the said welding current increase of the welding current value of the said time per unit of ambassador more is few more.
4. arc-welding apparatus according to claim 1, wherein,
The recruitment that said efferent can be exported the welding current of time per unit is the above and welding current below the 10000A/msec of 1000A/msec; The recruitment of the welding current of the time per unit in said first rise time is that 1000A/ms is above and below the 10000A/msec, the recruitment of the welding current of the time per unit in said second rise time is more than the 10A/msec and below the 500A/msec.
5. arc-welding apparatus according to claim 3, wherein,
The recruitment that said efferent can be exported the welding current of time per unit is the above and welding current below the 10000A/msec of 1000A/msec; The recruitment of the welding current of the time per unit in first rise time is more than the 1000A/msec and below the 10000A/msec; The recruitment of the welding current of the time per unit before said first current value of the arrival in second rise time is that 1000A/msec is above and below the 10000A/msec, the recruitment of the welding current that surpasses the time per unit under the situation of said first current value in second rise time is more than the 10A/msec and below the 500A/msec.
6. arc-welding apparatus according to claim 1, wherein,
Said control part is controlled as follows; Promptly; Welding current when making During normal welding reduces to second current value littler than said peak current value from peak current value; Make its switching-over after keeping this second current value stipulated time, and, make from first fall time that said peak current value is reduced to said second current value shorter than said second rise time.
7. arc-welding apparatus according to claim 1, wherein,
Said control part is controlled as follows, that is, second fall time of the zero passage of welding current when the peak value welding current reaches the polarity reversing of welding current till constantly when making During normal welding, shorter than said second rise time.
8. according to claim 6 or 7 described arc-welding apparatus, wherein,
Said efferent can realize that the reduction of the welding current of time per unit is more than the 800A/msec and the minimizing of the welding current below the 10000A/msec, and the reduction of the reduction of the welding current of the time per unit in said first fall time or the welding current of the time per unit in said second fall time is more than the 800A/ms and below the 10000A/msec.
9. arc-welding apparatus according to claim 1, wherein,
Said arc-welding apparatus also comprises:
Storage part, it is with respect to same welding current value, stores the recruitment of welding current value of the time per unit of a plurality of different welding currents; With
Selection portion, in the recruitment of the welding current value of the time per unit of a plurality of welding currents that it is stored from said storage part, the recruitment of the welding current value of the time per unit of a welding current of selection.
10. arc-welding apparatus according to claim 1, wherein,
Said efferent comprises conversion and control portion, and the inversion frequency of said conversion and control portion is that 40kHz is above and below the 1MHz.
11. arc-welding apparatus according to claim 1, wherein,
Said arc-welding apparatus also comprises the high-tension high voltage generation portion that the voltage when being used for when the starting the arc, between non-consumable electrode and welding object thing, applying than During normal welding is high, between said non-consumable electrode and said welding object thing, applies high voltage and carries out the starting the arc.
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| JP2010062355 | 2010-03-18 | ||
| JP2010-062355 | 2010-03-18 | ||
| PCT/JP2011/001450 WO2011114679A1 (en) | 2010-03-18 | 2011-03-14 | Arc welding apparatus |
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| CN102470473B CN102470473B (en) | 2014-07-02 |
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| Publication number | Publication date |
|---|---|
| WO2011114679A1 (en) | 2011-09-22 |
| CN102470473B (en) | 2014-07-02 |
| JPWO2011114679A1 (en) | 2013-06-27 |
| JP5293882B2 (en) | 2013-09-18 |
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