CN102448652A - Alternating-current arc welding device - Google Patents
Alternating-current arc welding device Download PDFInfo
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- CN102448652A CN102448652A CN2011800022876A CN201180002287A CN102448652A CN 102448652 A CN102448652 A CN 102448652A CN 2011800022876 A CN2011800022876 A CN 2011800022876A CN 201180002287 A CN201180002287 A CN 201180002287A CN 102448652 A CN102448652 A CN 102448652A
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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
- 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
- B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
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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
Abstract
Disclosed is an alternating-current arc welding device which selects a straight polarity base period and a reverse polarity base period in a second combination which are longer than normal straight polarity base period and reverse polarity base period, when a welding torch provided with a cable having large inductance is connected thereto. As a result, the high-quality alternating-current arc welding device, in which surge voltage generated by switching for polarity reversal can be kept low, thereby not causing the breakage of a semiconductor element, can be implemented.
Description
Technical field
The present invention relates to alternately to repeat the alternating current arc welder that antipolarity and positive polarity are carried out arc welding.
Background technology
In recent years, consider, in building, vehicle etc., utilize light weight and superior aluminum or the magnesium material of recirculation property mostly, in it engages, utilize the alternating current arc welder mostly from concern aspect to environment.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.
Especially, in the working site that produces building,, need to prolong welding torch or mother metal cable because near the welding job scene, can't dispose welder.Prolong welding torch or mother metal cable and can cause existing following problem: the inductance of weld load side increases, and the surge voltage that produces during switch transition when exchanging the polarity inversion of welding causes that the semiconductor element that constitutes secondary inverter is damaged.
Therefore, implement following countermeasure in order to protect semiconductor: before polarity inversion takes place,, suppress the surge voltage that is produced lower having passed through the switch transition that low current (for example below the 100A) carries out polarity inversion afterwards all the time.
Utilize Fig. 6～Fig. 8, the action of habitual all the time alternating current arc welder is described.Fig. 6 is the figure of the schematic construction of the existing alternating current arc welder of expression.Fig. 7 A, Fig. 7 B are the figure that changes the time of the welding current waveform in the existing alternating current arc welder of expression, and Fig. 8 A, Fig. 8 B are illustrated in the figure that has connected the state of welding torch on the existing alternating current arc welder.For the such alternating current arc welder that constitutes of Fig. 6, utilize Fig. 7 A, Fig. 7 B that its action is described.Below, with adopted during the repetition antipolarity alternately with positive polarity during the example of alternating current arc welder of the non-consumable electrode formula of welding describe.
In Fig. 6 and Fig. 8 A, Fig. 8 B, alternating current arc welder 1 comprises configuration part 8 and storage part 16 during welding efferent 2, welding control part 3, calculating part 4, a-c cycle configuration part 7, the antipolarity.And alternating current arc welder 1 welds thereby generate electric arc 11 from 9 pairs of mother metals of electrode 12 through drive first welding torch 10 or second welding torch 13 via cable 1a.Wherein, Fig. 8 A is illustrated in the example that has connected first welding torch 10 on the alternating current arc welder 1.Fig. 8 B illustrates the example that second welding torch 13 that possesses the length cable 1a longer than the cable 1a of first welding torch 10 shown in Fig. 8 a is connected to alternating current arc welder 1.
Have, in Fig. 7 A, Fig. 7 B, T1 is the cycle of a-c cycle F1 again; During REN is antipolarity, during R5 is positive polarity basic (base), R6 be antipolarity basic during; IENP is the positive polarity peak point current; IEPP is the antipolarity peak point current, and IENB is the positive polarity fundamental current, and IEPB is the antipolarity fundamental current; IEN3 is the welding current (welding current before the polarity inversion in during the positive polarity when connecting second welding torch 13) before the polarity inversion, and IEP3 is the welding current (welding current before the polarity inversion in during the antipolarity when connecting second welding torch 13) before the polarity inversion.
In Fig. 6; The welding efferent 2 of alternating current arc welder 1 will be from the industrial power of externally fed (for example 3 phase 200V etc.) as input; Based on carry out elementary inverter action and secondary inverter action from the output of welding control part 3; Suitably switch positive polarity and antipolarity, output is suitable for the weldingvoltage or the welding current of the actual welding of carrying out.
Elementary inverter usually by through PWM (Pulse Wide Modulation) action drives and not shown IGBT (Insulated Gate Bipolar Transistor) or elementary commutation diode or smoothly with electrolytic capacitor or power transfer with formations such as transformers.
Have, secondary inverter is made up of half-bridge that has adopted not shown IGBT or full-bridge circuit usually again, switches output polarity.
At this, so-called positive polarity is meant: the phenomenon of the movement of electrons direction in the arc-plasma for moving to mother metal 12 from electrode 9 is that electrode 9 is positive situation for negative, mother metal.In addition, antipolarity is meant: the phenomenon of the movement of electrons direction in the arc-plasma for moving to electrode 9 from mother metal 12 is electrode 9 for just, mother metal 12 is negative situation.
The a-c cycle configuration part 7 that is made up of CPU etc. is the parts that are used to set a-c cycle F1 (for example 70Hz), to calculating part 4 output AC frequency F1.Configuration part 8 is the parts that are used to set during the antipolarity during the antipolarity that is made up of CPU etc., during calculating part 4 output antipolarities.
Generally also be called as during the removing during the antipolarity, for example set as during the antipolarity with respect to ac cycle the antipolarity ratio of the ratio during whole (for example 30% etc.), decide antipolarity based on this antipolarity ratio during.
The storage part 16 storage positive polarity basic rates that constitute by CPU etc. and the combination of antipolarity basic rate, and export the content of being stored to calculating part 4.At this, the positive polarity basic rate is: before the polarity inversion in during positive polarity, through during the fundamental current lower than peak point current with respect to the ratio during the positive polarity.Have, the antipolarity basic rate is again: before the polarity inversion in during antipolarity, through during the fundamental current lower than peak point current with respect to the ratio during the antipolarity.
During the calculating part 4 that is made up of CPU etc. utilizes a-c cycle F1, antipolarity, positive polarity basic rate and antipolarity basic rate; Calculate positive polarity between the peak period, positive polarity basic during, antipolarity between the peak period and antipolarity basic during, and to 3 outputs of welding control part.At this, a-c cycle F1 is by 7 outputs of a-c cycle configuration part.Export by configuration part during the antipolarity 8 during the antipolarity.Positive polarity basic rate and antipolarity basic rate are by 16 outputs of combination storage part.
The welding current or the weldingvoltage of the output of welding efferent 2 are provided for first welding torch 10 or second welding torch 13, between the mother metal 12 of the front end of the electrode 9 that is made up of tungsten etc. and aluminum etc., produce electric arc 11, carry out the alternating current arc welding.
Then, utilize Fig. 7 A, the time of the welding current waveform when having connected first welding torch 10 changes and describes.
Calculating part 4 uses REN (the antipolarity ratio for example is 30%) during the cycle T 1, antipolarity of a-c cycle F1 (for example 70Hz), positive polarity basic rate R1 (for example being 5%), antipolarity basic rate R2 (for example being 11%), calculate positive polarity (for example be 9.5msec) between the peak period, positive polarity basic during (for example being 0.5msec), antipolarity (for example be 3.81msec) between the peak period and antipolarity basic during (for example being 0.47msec).
Shown in Fig. 7 A, during positive polarity in, consider to be converted to after positive polarity finished between the peak period positive polarity basically during in.At this moment, the current value of welding current is reduced to positive polarity fundamental current IENB (for example 100A) from positive polarity peak point current IENP (for example 400A).And if positive polarity finishes during basic, then welding current waveform is converted to during the antipolarity.
Have again, during antipolarity in, consider to be converted to after antipolarity finished between the peak period antipolarity basically during in.At this moment, welding current ((for example-100A) for example-400A) is reduced to antipolarity fundamental current IEPB from antipolarity peak point current IEPP.And if antipolarity finishes during basic, then welding current waveform is converted to during the positive polarity.
As stated, before polarity inversion, welding current is reduced to positive polarity fundamental current IENB from positive polarity peak point current IENP, or before polarity inversion, welding current is reduced to antipolarity fundamental current IEPB from antipolarity peak point current IEPP.Through the reduction of this welding current, the surge voltage that switch transition produced of secondary inverter suppresses lowlyer (for example about 300V) in the time of can be with polarity inversion.Can not cause the semiconductor element of the secondary inverter that constitutes welding efferent 2 damaged thus.
Then, utilize Fig. 7 B, the welding current waveform when possessing length also second welding of the cable 1a of long second length (for example 40m) is with welding torch 13 than the cable 1a of first length shown in Fig. 8 B having connected describes.
Shown in Fig. 7 B, during positive polarity in, consider to be converted to after positive polarity finished between the peak period positive polarity basically during in.At this moment, even export control signal according to the mode that becomes positive polarity fundamental current IENB, welding current can not be reduced to positive polarity fundamental current IENB (for example 100A) from positive polarity peak point current IENP (for example 400A) yet.And, during welding current only is reduced to and just is converted to antipolarity than welding current IEN3 (for example 300A) before the bigger polarity inversion of positive polarity fundamental current IENB.Its reason is narrated in the back.
Have again, during antipolarity in, consider to be converted to after antipolarity finished between the peak period antipolarity basically during in.At this moment, even export control signal according to the mode that becomes antipolarity fundamental current IEPB, welding current can ((for example-100A) for example-400A) not be reduced to antipolarity fundamental current IEPB from antipolarity peak point current IEPP yet.And welding current only is reduced to than welding current IEP3 before the bigger polarity inversion of antipolarity fundamental current IEPB (during for example-300A) just being converted to positive polarity.It the reasons are as follows said.
As stated, in the prior art,, cause the inductance of weld load side to increase, can't welding current reduced sharp through the welding electromagnetic energy that cable kept because the welding cable that is connected with welding torch is elongated.Therefore, the welding current before the polarity inversion can't be reduced to the positive polarity fundamental current IENB or the antipolarity fundamental current IEPB of target instruction target word value.And, become liken the electric current bigger to for the positive polarity fundamental current IENB of desired value or antipolarity fundamental current IEPB, be polarity inversion before before welding current IEN3 or the polarity inversion under the state of welding current IEP3, polarity inversion takes place.Therefore, the surge voltage that is produced by the switch transition of secondary inverter raises (for example about 600V), has the damaged problem of semiconductor element that constitutes secondary inverter.
Also have, existing interchange welder carries out polarity inversion having connected under the situation of welding with welding torch that possesses the bigger cable of inductance under the state that welding current can not fully reduce before polarity inversion.Therefore, the switch transition of dimension level inverter and the surge voltage that produces raises can cause the semiconductor element that constitutes secondary inverter damaged.
(prior art document)
Patent documentation 1: japanese kokai publication hei 2-235574 communique
Summary of the invention
Use welding torch even alternating current arc welder of the present invention connects the welding that possesses the bigger cable of inductance, also can select than common positive polarity basic during with antipolarity during basic positive polarity in long second combination basic during with antipolarity basically during.Thus, the surge voltage that provides a kind of switch transition of semiconductor element that can be with because of polarity inversion the time to produce suppresses lowlyer, semiconductor element can damaged high-quality alternating current arc welder.
Alternating current arc welder of the present invention alternately repeats to weld during the antipolarity and during the positive polarity, comprising: the a-c cycle configuration part, and it sets a-c cycle; Configuration part during the antipolarity, it is set during the antipolarity; Storage part; A plurality of combinations of its storage positive polarity basic rate and antipolarity basic rate; Wherein the positive polarity basic rate be during above-mentioned positive polarity in before the polarity inversion through during the fundamental current lower than peak point current with respect to the ratio during the above-mentioned positive polarity, the antipolarity basic rate be pass through before the polarity inversion in during above-mentioned antipolarity the fundamental current lower than peak point current during with respect to the ratio between said last polarity epoch; With selection portion, it is used for selecting 1 combination from a plurality of combinations thereof that above-mentioned storage part is stored, and this alternating current arc welder welds based on above-mentioned 1 combination that above-mentioned selection portion selects.
Constitute according to this, use welding torch even connect the welding that possesses the bigger cable of inductance, also can select than common positive polarity basic during with antipolarity during basic positive polarity in long second combination weld during basically with antipolarity during basic.Thus, the surge voltage that can the switch transition with because of polarity inversion the time produces suppresses lowlyer, thereby can realize that semiconductor element can damaged high-quality alternating current arc welder.
Have again; Alternating current arc welder of the present invention alternately repeats to weld during the antipolarity and during the positive polarity; Comprise: storage part; During storage positive polarity between the peak period, positive polarity are basic, antipolarity a plurality of combinations during basic with antipolarity between the peak period; Positive polarity between the peak period during above-mentioned positive polarity in through during the peak point current; During positive polarity is basic be during above-mentioned positive polarity in before the polarity inversion through during the fundamental current lower than above-mentioned peak point current, antipolarity between the peak period during above-mentioned antipolarity in through during the peak point current, during antipolarity is basic be during above-mentioned antipolarity in polarity inversion pass through before the fundamental current lower than above-mentioned peak point current during; With selection portion, it is used for selecting 1 combination from a plurality of combinations thereof that above-mentioned storage part is stored, and this alternating current arc welder welds based on above-mentioned 1 combination of being selected by above-mentioned selection portion.
Constitute according to this, use welding torch even connect the welding that possesses the bigger cable of inductance, also can select than common positive polarity basic during with antipolarity during basic positive polarity in long second combination weld during basically with antipolarity during basic.Thus, the surge voltage that can the switch transition with because of polarity inversion the time produces suppresses lowlyer, can realize that semiconductor element can damaged high-quality alternating current arc welder.
Description of drawings
Fig. 1 is the schematic configuration diagram of the alternating current arc welder of expression embodiment 1 of the present invention.
Fig. 2 A is the figure that changes the time of the welding current waveform of expression embodiment 1 of the present invention.
Fig. 2 B is the figure that changes the time of the welding current waveform of expression embodiment 1 of the present invention.
Fig. 2 C is the figure that changes the time of the welding current waveform of expression embodiment 1 of the present invention.
Fig. 3 A is illustrated in the figure that has connected the state of first welding torch on the alternating current arc welder of the present invention.
Fig. 3 B is illustrated in the figure that has connected the state of second welding torch on the alternating current arc welder of the present invention.
Fig. 4 is the schematic configuration diagram of the alternating current arc welder of expression embodiment 2 of the present invention.
Fig. 5 A is the figure that changes the time of the welding current waveform of expression embodiment 2 of the present invention.
Fig. 5 B is the figure that changes the time of the welding current waveform of expression embodiment 2 of the present invention.
Fig. 5 C is the figure that changes the time of the welding current waveform of expression embodiment 2 of the present invention.
Fig. 6 is the figure of the schematic construction of the existing alternating current arc welder of expression.
Fig. 7 A is the figure that changes the time of the welding current waveform of the existing alternating current arc welder of expression.
Fig. 7 B is the figure that changes the time of the welding current waveform of the existing alternating current arc welder of expression.
Fig. 8 A is illustrated in the figure that has connected the state of first welding torch on the existing interchange welder.
Fig. 8 B is illustrated in the figure that has connected the state of second welding torch on the existing interchange welder.
The specific embodiment
Followingly an embodiment of the present invention is described with reference to accompanying drawing.In following accompanying drawing, because give identical mark, so omit explanation sometimes for identical inscape.
(embodiment 1)
Utilize Fig. 1～Fig. 3 that this embodiment 1 is described.Fig. 1 is the figure of the schematic construction of the alternating current arc welder 21 in the expression embodiment 1 of the present invention.Fig. 2 A, Fig. 2 B, Fig. 2 C are respectively the figure that changes the time of the welding current waveform of expression embodiment 1 of the present invention.Fig. 3 A is illustrated in the figure that has connected the state of first welding torch on the alternating current arc welder 21 of the present invention, and Fig. 3 B is illustrated in the figure that has connected the state of second welding torch 13 on the alternating current arc welder 21 of the present invention.
Utilize Fig. 2 and Fig. 3, the action of such alternating current arc welder 21 that constitutes as shown in Figure 1 is described.Below, to adopted during the repetition antipolarity alternately with positive polarity during the example of alternating current arc welder of the non-consumable electrode formula of welding describe.
Like Fig. 1 and shown in Figure 3, alternating current arc welder 21 comprises configuration part 8 during welding efferent 2, welding control part 3, calculating part 4, selection portion 5, storage part 6, a-c cycle configuration part 7 and the antipolarity.Wherein, storage part 6 comprises first storage part 14 and second storage part 15.
Have again, shown in Fig. 3 A, connecting first welding torch 10 on the alternating current arc welder 21, export through welding is provided between electrode 9 and mother metal 12, thereby between electrode 9 and mother metal 12, produce electric arc 11 with cable 1a and electrode 9.
In addition, shown in Fig. 3 B, the state that has connected second welding torch 13 on the alternating current arc welder 21 is shown.And the cable 1a of second welding torch 13 is longer than the cable 1a of first welding torch 10.
Also have, shown in Fig. 2 A, Fig. 2 B, Fig. 2 C, T1 representes the cycle that a-c cycle F1 is corresponding, and REN representes during the antipolarity.During TB1 representes that positive polarity is basic, decide TB1 based on the positive polarity basic rate R1 during with first combination during the positive polarity.During TB2 represented that antipolarity is basic, the antipolarity basic rate R2 during based on the REN during the antipolarity and first combination decided TB2.During TB3 representes that positive polarity is basic, decide TB3 based on the positive polarity basic rate R3 during with second combination during the positive polarity.During TB4 represented that antipolarity is basic, the antipolarity basic rate R4 during based on the REN during the antipolarity and second combination decided TB4.IENP representes the positive polarity peak point current, and IEPP representes the antipolarity peak point current.IENB representes the positive polarity fundamental current, and IEPB representes the antipolarity fundamental current.IEN1 is a welding current before the polarity inversion, is welding current before the polarity inversion in during the positive polarity when connecting second welding torch and selecting first combination.IEP1 is a welding current before the polarity inversion, is welding current before the polarity inversion in during the antipolarity when connecting second welding torch and selecting first combination.
As shown in Figure 1, the welding efferent 2 of alternating current arc welder 21 will be from the industrial power of externally fed (for example 3 phase 200V etc.) as input, based on carry out elementary inverter action and the action of secondary inverter from the output of welding control part 3.Welding efferent 2 suitably switches positive polarity and antipolarity, the weldingvoltage or the welding current that are suitable for welding with output.
Elementary inverter usually by through PWM (Pulse Wide Modulation) action or phase shifts action and driven not shown IGBT (Insulated Gate Bipolar Transistor), not shown MOSFET (Metal-Oxide Semiconductor Field Effect Transistor), not shown elementary commutation diode, smoothly with electrolytic capacitor or power transfer with formations such as transformers.
In addition, secondary inverter uses not shown IGBT to be made up of half-bridge or full-bridge circuit usually, switches output polarity.
At this, so-called positive polarity is meant that the movement of electrons direction in the arc-plasma is from the direction of electrode 9 towards mother metal 12, is that electrode 9 is positive situation for negative, mother metal.In addition, antipolarity is meant movement of electrons direction in the arc-plasma for from the direction of mother metal 12 towards electrode 9, be electrode 9 for just, mother metal 12 is negative situation.
Have, the a-c cycle configuration part 7 that is made up of CPU etc. is the parts that are used to set a-c cycle F1 (for example 70Hz), and the value that sets is outputed to calculating part 4 again.Configuration part 8 is the parts that are used to set during the antipolarity during the antipolarity that is made up of CPU etc., and the value that sets is outputed to calculating part 4.Wherein, be commonly referred to as during the antipolarity during the removing, for example be based on during the antipolarity and decide with respect to ratio during ac cycle whole (for example 30%) etc.
The storage part 6 that is made up of CPU etc. stores a plurality of combinations of positive polarity basic rate and antipolarity basic rate, and institute's canned data is outputed to selection portion 5.At this, the positive polarity basic rate be during the positive polarity in before the polarity inversion through during the fundamental current lower than peak point current with respect to the ratio during the positive polarity.The antipolarity basic rate be during the antipolarity in before the polarity inversion through during the fundamental current lower than peak point current with respect to the ratio during the antipolarity.
The selection portion 5 that is made up of CPU etc. is from from selecting 1 a plurality of outputs of storage part 6, to calculating part 4 outputs.Wherein, the method for selecting about selection portion 5 will be narrated in the back.And, under the situation of welding, select to store the output of first storage part 14 of first combination at first welding torch 10 of the cable 1a that possesses first length (for example 4m) shown in the connection layout 3A.Have again, possessing length than the cable 1a of first length shown in Fig. 3 A also under second welding torch 13 and the situation of welding of the cable 1a (for example 40m) of the second long length shown in the connection layout 3B, select to store the output of second storage part 15 of second combination.
The calculating part 4 that is made up of CPU etc. utilizes during the antipolarity of configuration part 8 outputs during the a-c cycle F1, antipolarity of a-c cycle configuration part 7 outputs and the positive polarity basic rate and the antipolarity basic rate of 5 outputs of selection portion; Calculate positive polarity between the peak period, positive polarity basic during, antipolarity between the peak period and antipolarity basic during, and to 3 outputs of welding control part.
The welding efferent 2 based on from the welding control part 3 output instruction signal, through the action of secondary inverter, during positive polarity in as moving during the positive polarity, output polarity is switched to the direction that electronics moves to mother metal 12 from electrode 9.As moving during the antipolarity, welding efferent 2 switches to the direction that electronics moves to electrode 9 from mother metal 12 with output polarity in during antipolarity.In addition; Welding efferent 2 is through the action of elementary inverter; Output cathode property peak point current in positive polarity is between the peak period (for example 400A); Output cathode property fundamental current (for example 100A) in during positive polarity is basic, (output antipolarity fundamental current (for example-100A) in for example-400A), during antipolarity is basic for output antipolarity peak point current in antipolarity is between the peak period.
The welding current or the weldingvoltage of the output of welding efferent 2 are provided for first welding torch 10 or second welding torch 13 that is connected, and between the mother metal 12 of the front end of the electrode 9 that is made up of tungsten etc. and aluminum etc., produce electric arc 11, carry out the alternating current arc welding.
Then, utilize Fig. 2 A, when on alternating current arc welder 21, having connected first welding torch 10, action and welding current waveform that selection portion 5 has selected to store under the situation of output of first storage part 14 of first combination describe.
Be connected under the situation that alternating current arc welder 21 welds at first welding torch 10 of the cable that will possess first length (for example 4m), the output of first storage part 14 is selected by selection portion 5.And; The antipolarity basic rate R2 of the positive polarity basic rate R1 of first combination that the REN (for example the antipolarity ratio 30%) and first storage part 14 are stored during the antipolarity that calculating part 4 utilizes the a-c cycle F1 (for example 70Hz) that set by a-c cycle configuration part 7, set by configuration part during the antipolarity 8 (for example 5%) and first combination (for example 11%), calculate positive polarity (for example 9.5msec) between the peak period, positive polarity basic during (for example 0.5msec), antipolarity between the peak period (for example 3.81msec) and antipolarity basic during (for example 0.47msec).
Shown in Fig. 2 A, during positive polarity in, positive polarity finish between the peak period and be converted to positive polarity basic during when, welding current is reduced to positive polarity fundamental current IENB (for example 100A) from positive polarity peak point current IENP (for example 400A).If finish during positive polarity is basic, then welding current is converted to during the antipolarity.
Have again, during antipolarity in, antipolarity finish between the peak period and be converted to antipolarity basic during in, welding current ((for example-100A) for example-400A) is reduced to antipolarity fundamental current IEPB from antipolarity peak point current IEPP.If finish during antipolarity is basic, then welding current is converted to during the positive polarity.
Like this, before polarity inversion, welding current is reduced to as the positive polarity fundamental current IENB of target instruction target word value or antipolarity fundamental current IEPB.Thus, the surge voltage that switch transition produced of secondary inverter suppresses lowlyer (for example about 300V) in the time of can be with polarity inversion.As a result, can not cause the semiconductor element of the secondary inverter that constitutes welding efferent 2 damaged.
Next, consider that second welding torch 13 with the cable 1a that possesses second length (for example 40m) that length also grows than the cable of first length shown in Fig. 3 B is connected to the state of alternating current arc welder 21.Welding current waveform when utilizing Fig. 2 B selection portion 5 under this state to be selected to store the output of first storage part 14 of first combination describes.
Shown in Fig. 2 B, during positive polarity in, according to be converted to after finishing between the peak period in positive polarity positive polarity basic during when make welding current become positive polarity fundamental current IENB mode send instruction.But welding current can not be reduced to positive polarity fundamental current IENB (for example 100A) from positive polarity peak point current IENP (for example 400A).As a result, welding current only is reduced to than welding current IEN1 (for example 300A) before the big polarity inversion of positive polarity fundamental current IENB, just is converted to during the antipolarity then.Its reason will be narrated in the back.
Have again, during antipolarity in, according to be converted to after finishing between the peak period at antipolarity antipolarity basic during when make welding current become antipolarity fundamental current IEPB mode send instruction.But welding current can ((for example-100A) for example-400A) not be reduced to antipolarity fundamental current IEPB from antipolarity peak point current IEPP.As a result, welding current only is reduced to than welding current IEP1 before the big polarity inversion of antipolarity fundamental current IEPB and (for example-300A), just is converted to then during the positive polarity.It the reasons are as follows said.
Because second welding torch, the 13 such welding cables that increase shown in Fig. 3 B, the inductance of weld load side increases.So the welding electromagnetic energy that cable kept increases, welding current can't reduce sharp thus.And the welding current before the polarity inversion can't be reduced to the positive polarity fundamental current IENB or the antipolarity fundamental current IEPB of target instruction target word value at the appointed time.Like this, become liken the electric current high to for the positive polarity fundamental current IENB of target instruction target word value or antipolarity fundamental current IEPB, be polarity inversion before before welding current IEN1 or the polarity inversion under the state of welding current IEP1, polarity inversion takes place.Thus, the switch transition of dimension level inverter and the surge voltage that produces raises (for example about 600V), the semiconductor element that might cause constituting secondary inverter is damaged.
Then, the action that utilizes Fig. 2 C selection portion 5 when on alternating current arc welder 21, connecting second welding torch 13 to select to store the welding current waveform under the situation of output of second storage part 15 of second combination describes.
Possess under the situation that second welding torch 13 of the cable (for example 40m) of second length welds in connection, selection portion 5 outputs to calculating part 4 after selecting to store the output of second storage part 15 of second combination.The antipolarity basic rate R4 of the positive polarity basic rate R3 of the REN (for example the antipolarity ratio 30%) and second combination during the antipolarity that calculating part 4 utilizes the a-c cycle F1 (for example 70Hz) that set by a-c cycle configuration part 7, set by configuration part during the antipolarity 8 (for example 20%) and second combination (for example 44%), below calculating during.At this, first positive polarity basic rate and the antipolarity basic rate in making up that the positive polarity basic rate R3 of second combination is stored than first storage part 14 is big, and is stored in second storage part 15.
And, calculating part 4 calculate positive polaritys (for example 8.0msec) between the peak period, positive polarity basic during (for example 2.0msec), antipolarity between the peak period (for example 2.4msec) and antipolarity basic during (for example 1.9msec).Like this, based on second combination, can calculate positive polarity between the peak period, positive polarity basic during, antipolarity between the peak period and antipolarity basic during.Thus, and compare based on the first combination situation about calculating, elongated during basic during positive polarity is basic with antipolarity.And, positive polarity between the peak period and antipolarity shorten between the peak period.
Shown in Fig. 2 C; During positive polarity; Be converted to after positive polarity finished between the peak period positive polarity basic during when; Welding current is reduced to the positive polarity fundamental current IENB (for example 100A) as the welding current command value from positive polarity peak point current IENP (for example 400A), is converted to during the antipolarity then.
Moreover; During antipolarity; Be converted to after antipolarity finished between the peak period antipolarity basic during when; (for example-400A) drop to antipolarity fundamental current IEPB as the welding current command value (for example-100A), is converted to during the positive polarity welding current then from antipolarity peak point current IEPP.
Cause the inductance of weld load side to increase owing to increasing the welding cable, the welding electromagnetic energy that cable kept increases, and welding current can't reduce sharp thus.Yet, the enough sizes till can being reduced to positive polarity fundamental current IENB in the positive polarity basic rate R3 of second combination can be set at during the positive polarity that is calculated is basic.Enough sizes till can being reduced to antipolarity fundamental current IEPB in the antipolarity basic rate R4 of second combination can be set at during the antipolarity that is calculated is basic are arranged again.Therefore, the welding current before the polarity inversion is reduced to the positive polarity fundamental current IENB or the antipolarity fundamental current IEPB of target instruction target word value.Wherein, positive polarity basic rate R3 or antipolarity basic rate R4 for example can be in advance obtain through collection data such as experiment or construction in advance, and this result is stored in the storage part 6 in advance.
As stated, if adopt the present invention, then before polarity inversion, can welding current be reduced to positive polarity fundamental current IENB or antipolarity fundamental current IEPB as the target instruction target word value.Thus, can suppress the surge voltage that switch transition caused of the secondary inverter when the polarity inversion lower (for example about 300V), the semiconductor element that constitutes secondary inverter can be not damaged.
As stated; Carry out under the situation of alternating current arc welding even possess second welding torch 13 of the cable of big second length (for example 40m) of cable that inductance possessed than first welding torch 10 in connection, the semiconductor element that alternating current arc welder 21 is carried also can be damaged.Its reason is: the positive polarity basic rate and the antipolarity basic rate of second combination that positive polarity basic rate in making up than first through selection and antipolarity basic rate are big, thus can before polarity inversion, welding current fully be reduced.The surge voltage that the switch transition of semiconductor element that as a result, can be with because of polarity inversion the time causes suppresses lowlyer.
Promptly; Alternating current arc welder 21 of the present invention is alternately to repeat during the antipolarity and the alternating current arc welder that welds during the positive polarity; Comprise configuration part 8 during a-c cycle configuration part 7, the antipolarity, storage part 6 and selection portion 5, take a formation that combination is welded of selecting based on selection portion 5.At this, a-c cycle is set in a-c cycle configuration part 7, and configuration part 8 is set during the antipolarity during the antipolarity.A plurality of combinations of storage part 6 storage positive polarity basic rates and antipolarity basic rate.Wherein, the positive polarity basic rate be during the positive polarity in before the polarity inversion through during the fundamental current lower than peak point current with respect to the ratio during the positive polarity.The antipolarity basic rate be during the antipolarity in before the polarity inversion through during the fundamental current lower than peak point current with respect to the ratio during the antipolarity.
According to this formation; Even connected second welding torch 13 that possesses the bigger cable 1a of inductance, also can select than common positive polarity basic during with antipolarity during basic positive polarity in long second combination weld during basic with antipolarity during basic.Thus, the surge voltage that can the switch transition with because of polarity inversion the time produces suppresses lowlyer, can realize the unabroken high-quality alternating current arc welder 21 of semiconductor element.
Have again; Also can take following formation: storage part 6 stores at least 2 combinations of positive polarity basic rate and antipolarity basic rate; Positive polarity basic rate in first combination is littler than positive polarity basic rate and antipolarity basic rate in second combination with the antipolarity basic rate, selects this to make up according to welding condition and welds.At this, the so-called welding according to welding condition is meant: for example possess under the situation that first welding torch 10 of the cable 1a of first length welds in connection, select first combination to weld by selection portion 5.In addition, equally also be meant connection possess length second length longer than the cable 1a of first length cable 1a second welding torch 13 and under the situation of welding, select second combination to weld by selection portion 5.
Constitute according to this, even for the different various situation of welding condition, welding current carries out polarity inversion after all can being reduced to the level of current value of positive polarity fundamental current IENB or antipolarity fundamental current IEPB fully.Thus, the surge voltage that can the switch transition with because of polarity inversion the time produces suppresses lowlyer, can realize the unabroken high-quality alternating current arc welder 21 of semiconductor element.
Wherein, through selecting second combination owing to increase during basic, sometimes the output valve of the reality of welding current can descend or positive polarity during heat input and antipolarity during the balance of heat input change the welding procedure condition such and change.In this case, for example also consider to wait and export adjustment as required with the control that peak point current is increased.
Also have, in this embodiment 1, when having connected second welding torch 13, select second combination.Be not limited to this situation, when under the state that the inductance of weld load side increases considerably when common, using, equally also can select second combination.Using the first short welding torch 10 of cable 1a but connected the situation of long mother metal side line cable (for example 40m), or connect with the state (for example twining 10 circles) that twines under the situation of welding cable and produce though the increase state of this inductance is for example thought.
In addition, positive polarity peak point current and antipolarity peak point current are illustrated as fixed value arbitrarily in Fig. 2 A, Fig. 2 B, Fig. 2 C, but also can be the waveform that positive polarity is between the peak period in, changes.
And then; The selection that selection portion 5 carries out both can be manually to switch; The automatic measurement section 17 of the inductance of automatic measurement weld load side can also be set in alternating current arc welder 21, select automatically and switch based on the measurement result of this automatic measurement section 17.Wherein, automatically measurement section 17 has the threshold value that is used to select, and selects first combination at inductance under less than the situation of threshold value, is to select second combination under the situation more than the threshold value at inductance.
In addition, under situation about manually switching, for example also can in alternating current arc welder 21, be provided for switching the mode switch button 18 of two kinds of patterns in addition, based on the state of this mode switch button 18, selection portion 5 is selected.Like this, for the action of alternating current arc welder 21, can carry out operator's selection.
Have again, in this embodiment 1, though welding is illustrated to alternating current arc, even in the alternating current arc welding of consumable electrode type, also be same.
(embodiment 2)
Utilize Fig. 3～Fig. 5, this embodiment 2 is described.Fig. 4 is the figure of the schematic construction of the alternating current arc welder 31 in expression this embodiment 2.Fig. 5 A, Fig. 5 B, Fig. 5 C are respectively the figure that changes the time of the welding current waveform in the expression embodiment 2 of the present invention.Fig. 3 A is illustrated in the figure that has connected the state of first welding torch 10 on the alternating current arc welder 31 of the present invention, and Fig. 3 B is illustrated in the figure that has connected the state of second welding torch 13 on the alternating current arc welder 31 of the present invention.Utilize Fig. 3 A, Fig. 3 B and Fig. 5 A, Fig. 5 B, Fig. 5 C, the action of such alternating current arc welder 31 that constitutes as shown in Figure 4 is described.
This embodiment 2 is with the main difference part of embodiment 1: during positive polarity is basic or the determining method of antipolarity during basic.That is, in embodiment 1, show based on during a-c cycle, the antipolarity, positive polarity basic rate and antipolarity basic rate calculate positive polarity basic during and the example of antipolarity during basic.On the other hand; In this embodiment 2; With positive polarity basic during, antipolarity basic during, positive polarity is between the peak period and a plurality of combinations of antipolarity between the peak period, is stored in advance in the storage part as each different combinations with distinguishing, from these a plurality of combinations, select.Below, to adopted alternately repeat during the antipolarity with positive polarity during the example of alternating current arc welder of the non-consumable electrode formula of welding describe.
Shown in Fig. 5 A, TP1 representes the positive polarity between the peak period in first combination, and during TB1 represented that the positive polarity in first combination is basic, TP2 represented that antipolarity in first combination is between the peak period, during TB2 representes that the antipolarity in first combination is basic.Have, shown in Fig. 5 C, TP3 representes the positive polarity between the peak period in second combination again, and during TB3 represented that the positive polarity in second combination is basic, TP4 represented that antipolarity in second combination is between the peak period, during TB4 representes that the antipolarity in second combination is basic.Also have, shown in Fig. 5 B, welding current before the polarity inversion during the positive polarity in the combination of first when IEN2 has represented to connect second welding torch 13.Welding current before the polarity inversion during the antipolarity in when IEP2 has represented to connect second welding torch 13 first combination.
As shown in Figure 4, the storage part 6 that constitutes by CPU etc. stored positive polarity between the peak period, positive polarity basic during, antipolarity a plurality of combinations during basic with antipolarity between the peak period, and the array output that will be selected by selection portion 5 is to selection portion 5.At this, positive polarity is interior through during the peak point current during the positive polarity between the peak period.During positive polarity is basic be during the positive polarity before the inherent polarity inversion through during the fundamental current lower than peak point current.Antipolarity is interior through during the peak point current during the antipolarity between the peak period.During antipolarity is basic be during the antipolarity before the inherent polarity inversion through than during the fundamental current of peak point current low (absolute value is little).
The selection portion 5 that is made up of CPU etc. selects 1 from the output from a plurality of combinations of storage part 6, and to 3 outputs of welding control part.Consider to connect first welding torch 10 of the cable 1a (for example 4m) that possesses first length shown in Fig. 3 A and the situation of welding.Under this situation, output to welding control part 3 after the output of first storage part 14 of selection portion 5 selection storages, first combination.On the other hand, consider to connect second welding torch 13 of the cable 1a (for example 40m) that possesses second length shown in that length is grown than the cable 1a of first length, Fig. 3 B and the situation of welding.Under this situation, the output of second storage part 15 of storage second combination is selected by selection portion 5.
The welding efferent 2 based on from the welding control part 3 output instruction signal, through the action of secondary inverter, during positive polarity in as moving during the positive polarity, output polarity is switched to the direction that electronics moves to mother metal 12 from electrode 9.In addition, the welding efferent 2 based on from the welding control part 3 output instruction signal, during antipolarity in as moving during the antipolarity, output polarity is switched to the direction that electronics moves to electrode 9 from mother metal 12.In addition, the action of welding efferent 2 through elementary inverter, output cathode property peak point current in positive polarity is between the peak period (for example 400A), during positive polarity basically in output cathode property fundamental current (for example 100A).And welding efferent 2 is exported the antipolarity peak point current in antipolarity is between the peak period (output antipolarity fundamental current (for example-100A) in for example-400A), during antipolarity is basic.
The welding current or the weldingvoltage of 2 outputs of welding efferent are provided for first welding torch 10 or second welding torch 13 that is connected on the alternating current arc welder 31.So, between the mother metal 12 of the front end of the electrode 9 that constitutes by tungsten etc. and aluminum etc., producing electric arc 11, alternating current arc welder 31 carries out the alternating current arc welding.
Then, utilize Fig. 5 A, on alternating current arc welder 31, having connected first welding torch 10, the action that the welding current waveform under the situation of output of first storage part 14 of first combination has been selected to store by selection portion 5 describes.
Shown in Fig. 5 A, consider during positive polarity in positive polarity be converted to the situation of positive polarity during basically after finishing between the peak period.At this moment, welding current is reduced to the positive polarity fundamental current IENB (for example 100A) as the welding current command value from positive polarity peak point current IENP (for example 400A) in the TB1 during positive polarity is basic, be converted to during the antipolarity then.
Have again, consider during antipolarity in antipolarity be converted to the situation of antipolarity during basically after finishing between the peak period.At this moment, welding current during antipolarity is basic in the TB2 from antipolarity peak point current IEPP (for example-400A) be reduced to antipolarity fundamental current IEPB as the welding current command value (for example-100A), be converted to positive polarity then during.
Like this, before polarity inversion, welding current is reduced to as till the positive polarity fundamental current IENB of target instruction target word value or the antipolarity fundamental current IEPB.The surge voltage that the switch transition of secondary inverter that thus, can be with because of polarity inversion the time produces suppresses lowlyer (for example about 300V).As a result, the semiconductor element of the secondary inverter of formation welding efferent 2 can be damaged.
Then, utilize Fig. 5 B, second welding torch 13 that consideration will possess the cable 1a of second length (for example 40m) longer than the cable 1a of first length is connected to the situation that alternating current arc welder 31 welds.The action of the welding current waveform the when output of first storage part 14 has been selected by selection portion 5 under this situation describes.
The output of first storage part 14 of first combination is selected to store by selection portion 5, with the positive polarity of positive polarity TP1 (for example 9.5msec), first combination between the peak period of first combination basic during the antipolarity of TB1 (for example 0.5msec), first combination between the peak period antipolarity of TP2 (for example 3.81msec) and first combination basic during TB2 (for example 0.47msec) output to welding control part 3.
Shown in Fig. 5 B; During positive polarity; After positive polarity finished between the peak period, be converted to positive polarity basic during when, welding current can't be reduced to the positive polarity fundamental current IENB (for example 100A) as the welding current command value from positive polarity peak point current IENP (for example 400A) in the TB1 during positive polarity is basic.That is, welding current only is reduced to than welding current IEN2 (for example 300A) before the big polarity inversion of positive polarity fundamental current IENB, just is converted to during the antipolarity then.Its reason will be narrated in the back.
Have again; During antipolarity; After antipolarity finished between the peak period, be converted to antipolarity basic during when; Welding current can't (as the antipolarity fundamental current IEPB of welding current command value (for example-100A) for example-400A) be reduced to from antipolarity peak point current IEPP during antipolarity is basic in the TB2.That is, welding current only is reduced to than welding current IEP2 before the big polarity inversion of antipolarity fundamental current IEPB and (for example-300A), just is converted to then during the positive polarity.It the reasons are as follows said.
Because increase the welding cable, the inductance of weld load side increases, so the welding electromagnetic energy that cable kept increases, welding current can't reduce sharp thus.Welding current before the polarity inversion can't be reduced to the positive polarity fundamental current IENB or the antipolarity fundamental current IEPB of target instruction target word value, the state generation polarity inversion down of welding current IEP2 before welding current IEN2 or the polarity inversion before becoming the electric current higher than the positive polarity fundamental current IENB of target instruction target word value or antipolarity fundamental current IEPB, being polarity inversion.Thus, the switch transition of dimension level inverter and the surge voltage that produces raises (for example about 600V), the semiconductor element that might cause constituting secondary inverter is damaged.
Then, the action that utilizes Fig. 5 C selection portion 5 when on alternating current arc welder 31, connecting second welding torch 13 to select to store the welding current waveform under the situation of output of second storage part 15 of second combination describes.
Shown in Fig. 5 C, consider during positive polarity in positive polarity be converted to the situation of positive polarity during basically after finishing between the peak period.At this moment, welding current is reduced to the positive polarity fundamental current IENB (for example 100A) as the welding current command value from positive polarity peak point current IENP (for example 400A) in the TB3 during positive polarity is basic, be converted to during the antipolarity then.
Have again, consider during antipolarity in antipolarity be converted to the situation of antipolarity during basically after finishing between the peak period.At this moment, welding current during antipolarity is basic in the TB4 from antipolarity peak point current IEPP (for example-400A) be reduced to antipolarity fundamental current IEPB as the welding current command value (for example-100A), be converted to positive polarity then during.
Cause the inductance of weld load side to increase owing to increasing the welding cable, the welding electromagnetic energy that cable kept increases, and welding current can't reduce sharp thus.Yet TB3 can be set at the enough sizes till during positive polarity is basic, can being reduced to positive polarity fundamental current IENB in the TB3 during the positive polarity of second combination was basic.Have, TB4 can be set at the enough sizes till during antipolarity is basic, can being reduced to antipolarity fundamental current IEPB in the TB4 during the antipolarity of second combination was basic again.Set through these, the welding current before the polarity inversion can be reduced to the positive polarity fundamental current IENB or the antipolarity fundamental current IEPB of target instruction target word value.
Before polarity inversion, welding current is reduced to as the positive polarity fundamental current IENB of target instruction target word value or antipolarity fundamental current IEPB.Thus, the surge voltage that the switch transition of secondary inverter that can be with because of polarity inversion the time produces suppresses lowlyer (for example about 300V), and the semiconductor element that constitutes secondary inverter can be damaged.
As stated, be connected to alternating current arc welder 31 and carry out alternating current arc welding when connecing, select combination as follows at second welding torch 13 of the cable that will possess the bigger second length 1a (for example 40m) of inductance.That is, select than the positive polarity in first combination basic during with antipolarity during basic positive polarity in long second combination basic during with antipolarity basic during.Thus, can welding current fully reduced, the surge voltage that can the switch transition with because of polarity inversion the time produces suppresses lowlyer, so semiconductor element can be damaged.
That is, alternating current arc welder 31 of the present invention is alternately to repeat during the antipolarity and the alternating current arc welder that welds during the positive polarity, possesses storage part 6 and selection portion 5, takes 1 formation that combination is welded selecting based on selection portion 5.At this, during storage part 6 storage positive polaritys between the peak period, positive polarity are basic, antipolarity is between the peak period and a plurality of combinations of antipolarity during basic.Wherein, positive polarity is interior through during the peak point current during the positive polarity between the peak period.During positive polarity is basic be during the positive polarity before the inherent polarity inversion through during the fundamental current lower than peak point current.Antipolarity is interior through during the peak point current during the antipolarity between the peak period.During antipolarity is basic be during the antipolarity before the inherent polarity inversion through during the fundamental current lower than peak point current.Have, 1 combination is selected by selection portion 5 from a plurality of combinations that storage part 6 is stored again.
Constitute according to this, even connect second welding torch 13 that possesses the bigger cable 1a of inductance, also can select than common positive polarity basic during with antipolarity during basic positive polarity in long second combination weld during basic with antipolarity during basic.Thus, the surge voltage that can the switch transition with because of polarity inversion the time produces suppresses lowlyer, can realize the unabroken high-quality alternating current arc welder 31 of semiconductor element.
Have again; Also can take following formation: storage part 6 store positive polarity between the peak period, positive polarity basic during, antipolarity is between the peak period and at least 2 combinations of antipolarity during basic; Shorter during basic with antipolarity during basic than the positive polarity in second combination during basic during positive polarity in first combination is basic with antipolarity, select this to make up according to welding condition and weld.At this, the so-called welding according to welding condition is meant: for example possess under the situation that first welding torch 10 of the cable 1a of first length welds in connection, select first combination to weld by selection portion 5.In addition, equally also be meant connection possess length second length longer than the cable 1a of first length cable 1a second welding torch 13 and under the situation of welding, select second combination to weld by selection portion 5.
Constitute according to this, even for the different various situation of welding condition, welding current carries out polarity inversion after all can being reduced to the level of current value of positive polarity fundamental current IENB or antipolarity fundamental current IEPB fully.Thus, the surge voltage that can the switch transition with because of polarity inversion the time produces suppresses lowlyer, can realize the unabroken high-quality alternating current arc welder 31 of semiconductor element.
Wherein since select second combination and basic during increase, therefore sometimes the output valve of the reality of welding current descend or positive polarity during heat input and antipolarity during the such welding procedure condition of changes in balance of heat input change.In this case, for example also consider to carry out etc., export adjustment as required with the control that peak point current is increased.
Also have, in this embodiment 2, when second welding torch 13 is connected to alternating current arc welder 31, selected second combination.Be not limited to this situation, when under the state that the inductance of weld load side increases considerably when common, using, equally also can select second combination.Using the first short welding torch 10 of cable 1a but connected the situation of long mother metal side line cable (for example 40m), or connect with the state (for example twining 10 circles) that twines under the situation of welding cable and produce though the increase state of this inductance is for example thought.
In addition, positive polarity peak point current and antipolarity peak point current are illustrated as fixed value arbitrarily in Fig. 5 A, Fig. 5 B, Fig. 5 C, but also can be the waveforms that positive polarity is between the peak period in, changes.
And then; The selection that selection portion 5 carries out both can be manually to switch; The automatic measurement section 17 of the inductance of automatic measurement weld load side can also be set in alternating current arc welder 31, select automatically and switch based on the measurement result of this automatic measurement section 17.Wherein, automatically measurement section 17 has the threshold value that is used to select, and selects first combination at inductance under less than the situation of threshold value, is to select second combination under the situation more than the threshold value at inductance.
In addition, under situation about manually switching, for example also can in alternating current arc welder 31, be provided for switching the mode switch button 18 of two kinds of patterns in addition, based on the state of this mode switch button 18, selection portion 5 is selected.Like this, for the action of alternating current arc welder 31, can carry out operator's selection.
Have again, in this embodiment 2, though welding is illustrated to alternating current arc, even in the alternating current arc welding of consumable electrode type, also be same.
Also have, TB2, positive polarity fundamental current IENB and antipolarity fundamental current IEPB etc. for example can obtain through collection data such as experiment or constructions in advance during TB1 during positive polarity is basic, antipolarity were basic, and this result is stored in the storage part 6 in advance.
(utilizability on the industry)
As stated; Use welding torch even the application's invention connects the welding possess the bigger cable of inductance, also can select than the positive polarity in the first common combination basic during with antipolarity during basic positive polarity in long second combination basic during with antipolarity basically during.Thus, the surge voltage that can the switch transition because of polarity inversion be produced suppresses lowlyer, and semiconductor element can be not damaged.Therefore; Alternating current arc welder of the present invention especially adopts the alternating current arc welder in the industry that aluminum or magnesium material produce as for example automobile industry or the building industry etc. that carry out alternating current arc welding construction, is very useful on industry.
Symbol description
The 1a cable
2 welding efferents
3 welding control parts
4 calculating parts
5 selection portions
6,16 storage parts
7 a-c cycle configuration parts
Configuration part during 8 antipolarities
9 electrodes
10 first welding torches
11 electric arcs
12 mother metals
13 second welding torches
14 first storage parts
15 second storage parts
17 automatic measurement section
18 mode switch button
21,31 alternating current arc welders
Claims (according to the modification of the 19th of treaty)
1. (after revising) a kind of alternating current arc welder possesses welding efferent, welding control part and storage part, alternately repeat to weld during the antipolarity and during the positive polarity,
Said alternating current arc welder also comprises:
The a-c cycle configuration part, it sets a-c cycle;
Configuration part during the antipolarity, it is set during the antipolarity;
Calculating part, its calculate during the said positive polarity with said antipolarity during, and output to said welding control part; With
Selection portion, it selects 1 and to the output of said calculating part from a plurality of outputs of said storage part,
Said welding control part passed through the positive polarity fundamental current lower than the peak point current during the said positive polarity before the polarity inversion that finishes during the said positive polarity; Before the polarity inversion that finishes during the said antipolarity, pass through the antipolarity fundamental current lower than the peak point current during the said antipolarity
Said storage portion stores:
(a) a plurality of combinations of positive polarity basic rate and antipolarity basic rate; Wherein, Said positive polarity basic rate during said positive polarity in through the ratio during the said positive polarity fundamental current, said antipolarity basic rate during said antipolarity in through the ratio during the said antipolarity fundamental current; Perhaps
(b) positive polarity between the peak period, positive polarity basic during, antipolarity a plurality of combinations during basic with antipolarity between the peak period; Wherein, Said positive polarity between the peak period during said positive polarity in through during the said peak point current, through during the said positive polarity fundamental current, said antipolarity passed through during the peak point current in during said antipolarity between the peak period during said positive polarity was basic; During said antipolarity is basic through during the said antipolarity fundamental current
1 combination is selected by said selection portion from a plurality of said combination that said storage part is stored,
Said alternating current arc welder welds based on said 1 combination of being selected by said selection portion.
2. (revise afterwards) alternating current arc welder according to claim 1, wherein,
Said storage portion stores has at least 2 combinations of said positive polarity basic rate and said antipolarity basic rate, and the positive polarity basic rate in first combination is littler than positive polarity basic rate and antipolarity basic rate in second combination with the antipolarity basic rate,
Possess in connection under the situation that first welding of the cable of first length welds with welding torch, select said first combination to weld through said selection portion,
Possess in connection under the situation that second welding of the cable of second length longer than the cable of said first length welds with welding torch, select said second combination to weld through said selection portion.
3. (deletion)
4. (revise afterwards) alternating current arc welder according to claim 1, wherein,
During said storage portion stores has said positive polarity between the peak period, said positive polarity basic, at least 2 combinations during basic with said antipolarity between the peak period of said antipolarity; It is shorter during basic with antipolarity during basic than the positive polarity in second combination during basic during positive polarity in first combination is basic with antipolarity
Possess in connection under the situation that first welding of the cable of first length welds with welding torch, select said first combination to weld through selection portion,
Possess in connection under the situation that second welding of the cable of second length longer than the cable of said first length welds with welding torch, select said second combination to weld through said selection portion.
Claims (4)
1. an alternating current arc welder alternately repeats to weld during the antipolarity and during the positive polarity, and this alternating current arc welder comprises:
The a-c cycle configuration part, it sets a-c cycle;
Configuration part during the antipolarity, it is set during the antipolarity;
Storage part; A plurality of combinations of its storage positive polarity basic rate and antipolarity basic rate; Wherein, Said positive polarity basic rate be during said positive polarity in before the polarity inversion through during the fundamental current lower than peak point current with respect to the ratio during the said positive polarity, said antipolarity basic rate be pass through before the polarity inversion in during said antipolarity the fundamental current lower than peak point current during with respect to the ratio during the said antipolarity; With
Selection portion, it is used for selecting 1 combination from a plurality of said combination that said storage part is stored,
Said alternating current arc welder welds based on said 1 combination of being selected by said selection portion.
2. alternating current arc welder according to claim 1, wherein,
Said storage portion stores has at least 2 combinations of said positive polarity basic rate and said antipolarity basic rate, and the positive polarity basic rate in first combination is littler than positive polarity basic rate and antipolarity basic rate in second combination with the antipolarity basic rate,
Possess in connection under the situation that first welding of the cable of first length welds with welding torch, select said first combination to weld through selection portion,
Possess in connection under the situation that second welding of the cable of second length longer than the cable of said first length welds with welding torch, select said second combination to weld through said selection portion.
3. an alternating current arc welder alternately repeats to weld during the antipolarity and during the positive polarity, and this alternating current arc welder comprises:
Storage part; During its storage positive polarity between the peak period, positive polarity are basic, antipolarity a plurality of combinations during basic with antipolarity between the peak period; Wherein, Said positive polarity between the peak period during said positive polarity in through during the peak point current; During said positive polarity is basic be during said positive polarity in before the polarity inversion through during the fundamental current lower than said peak point current, said antipolarity between the peak period during said antipolarity in through during the peak point current, during said antipolarity is basic be during said antipolarity in polarity inversion pass through before the fundamental current lower than said peak point current during; With
Selection portion, it is used for selecting 1 combination from a plurality of said combination that said storage part is stored,
Said alternating current arc welder welds based on said 1 combination of being selected by said selection portion.
4. alternating current arc welder according to claim 3, wherein,
During said storage portion stores has said positive polarity between the peak period, said positive polarity basic, at least 2 combinations during basic with said antipolarity between the peak period of said antipolarity; It is shorter during basic with antipolarity during basic than the positive polarity in second combination during basic during positive polarity in first combination is basic with antipolarity
Possess in connection under the situation that first welding of the cable of first length welds with welding torch, select said first combination to weld through selection portion,
Possess in connection under the situation that second welding of the cable of second length longer than the cable of said first length welds with welding torch, select said second combination to weld through said selection portion.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010043931 | 2010-03-01 | ||
| JP2010-043931 | 2010-03-01 | ||
| PCT/JP2011/000967 WO2011108221A1 (en) | 2010-03-01 | 2011-02-22 | Alternating-current arc welding device |
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| Publication Number | Publication Date |
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| CN102448652A true CN102448652A (en) | 2012-05-09 |
| CN102448652B CN102448652B (en) | 2015-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201180002287.6A Active CN102448652B (en) | 2010-03-01 | 2011-02-22 | Alternating-current arc welding device |
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| JP (1) | JP5877316B2 (en) |
| CN (1) | CN102448652B (en) |
| WO (1) | WO2011108221A1 (en) |
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| WO2014011564A2 (en) * | 2012-07-09 | 2014-01-16 | Ira Milton Trachtman | Compositions and method for treatment and prophylaxis of inflammatory bowel disease |
| JP7045798B2 (en) * | 2016-12-29 | 2022-04-01 | 株式会社ダイヘン | Output control method for AC pulse arc welding |
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| JPH05261535A (en) * | 1992-03-17 | 1993-10-12 | Matsushita Electric Ind Co Ltd | Method for controlling consumable electrode ac arc welding machine |
| JPH0679457A (en) * | 1991-12-18 | 1994-03-22 | Kobe Steel Ltd | Bipolar pulse arc welding method and its equipment |
| JPH10146673A (en) * | 1996-11-18 | 1998-06-02 | Kobe Steel Ltd | Alternating current self shield arc welding method |
| WO2002083351A1 (en) * | 2001-04-17 | 2002-10-24 | Lincoln Global, Inc. | Electric arc welding system |
| WO2008140398A1 (en) * | 2007-05-11 | 2008-11-20 | Esab Ab | Welding power supply |
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|---|---|---|---|---|
| JP2663535B2 (en) * | 1988-07-20 | 1997-10-15 | 株式会社ダイヘン | Power supply for arc machining |
| JP2699528B2 (en) * | 1989-03-08 | 1998-01-19 | 株式会社ダイヘン | Power supply for AC arc welding |
| JP4233690B2 (en) * | 1999-07-16 | 2009-03-04 | 株式会社ダイヘン | AC arc welding power supply control method and power supply apparatus |
| JP2008279462A (en) * | 2007-05-08 | 2008-11-20 | Daihen Corp | Electric power source for ac arc welding |
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2011
- 2011-02-22 WO PCT/JP2011/000967 patent/WO2011108221A1/en active Application Filing
- 2011-02-22 CN CN201180002287.6A patent/CN102448652B/en active Active
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0679457A (en) * | 1991-12-18 | 1994-03-22 | Kobe Steel Ltd | Bipolar pulse arc welding method and its equipment |
| JPH05261535A (en) * | 1992-03-17 | 1993-10-12 | Matsushita Electric Ind Co Ltd | Method for controlling consumable electrode ac arc welding machine |
| JPH10146673A (en) * | 1996-11-18 | 1998-06-02 | Kobe Steel Ltd | Alternating current self shield arc welding method |
| WO2002083351A1 (en) * | 2001-04-17 | 2002-10-24 | Lincoln Global, Inc. | Electric arc welding system |
| WO2008140398A1 (en) * | 2007-05-11 | 2008-11-20 | Esab Ab | Welding power supply |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2011108221A1 (en) | 2013-06-20 |
| JP5877316B2 (en) | 2016-03-08 |
| CN102448652B (en) | 2015-02-11 |
| WO2011108221A1 (en) | 2011-09-09 |
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