CN101264544B - Output control method for consumable electrode AC arc welding power supply - Google Patents
Output control method for consumable electrode AC arc welding power supply Download PDFInfo
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- CN101264544B CN101264544B CN 200810081541 CN200810081541A CN101264544B CN 101264544 B CN101264544 B CN 101264544B CN 200810081541 CN200810081541 CN 200810081541 CN 200810081541 A CN200810081541 A CN 200810081541A CN 101264544 B CN101264544 B CN 101264544B
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- 238000003466 welding Methods 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000006641 stabilisation Effects 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 9
- 230000001681 protective effect Effects 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 238000002844 melting Methods 0.000 abstract 3
- 230000008018 melting Effects 0.000 abstract 3
- 238000011105 stabilization Methods 0.000 abstract 1
- 238000002789 length control Methods 0.000 description 11
- 238000001514 detection method Methods 0.000 description 6
- 238000010891 electric arc Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 230000000875 corresponding effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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Abstract
An output control method of melting electrode alternating current arc welding power source is disclosed; external characteristic slope (Kr) of the melting electrode alternating current arc welding power source for alternatively switching electrode positive polarity (EP) and electrode negative polarity (EN) to weld, is controlled in accordance with welding conditions; the external characteristic slope (Kr) is set as the first external characteristic slope (Kr1) at the time of the electrode positive polarity (EP) and as the second external characteristic slope (Kr2) whose absolute value is larger than that of the first external characteristic slope (Kr1) at the time of the electrode negative polarity (EN); the first and second external characteristic slopes are set in terms of the way of stabilization for welding states under respectively corresponding polarities, such that in the melting electrode alternating current arc welding, the stability of the welding states can be enhanced by controlling the external characteristics of the welding power source.
Description
Technical field
The present invention relates to for the output control method that the slope of the external behavior of the source of welding current is controlled to be the consumable electrode AC arc welding power supply of appropriate value according to welding condition.
Background technology
Fig. 4 is the figure of the external behavior of expression consumable electrode arc welding power source.This figure transverse axis represents the output current Iw of the source of welding current, and the longitudinal axis represents the weldingvoltage Vw of lead-out terminal voltage.External behavior L1, L2 represent the relation between output current Iw and the weldingvoltage Vw, usually, and for descending near straight line to the right.Therefore, external behavior can represent with following formula.
Vw=Kr * (Iw-Ir)+Vr (formula 1)
Wherein, Kr[V/A] be external behavior slope setting value, Ir[A] be the output current a reference value, Vr[V] be the weldingvoltage a reference value.Be worth to set external behavior by setting these.
For example, externally characteristic L1 is the roughly constant voltage characteristic situation of slope setting value Kr=-0.03V/A, and external behavior L2 is the situation vertically downward of slope setting value Kr=-0.1V/A.In consumable electrode arc welding, be very important even obtain occuring the good welding quality that various interference also can be controlled at arc length appropriate value.To the control that arc length maintains appropriate value be called arc length control for this interference.The slope of external behavior is because determine the gain (gain) of arc length control system, so have close relationship with the arc length control system.
Therefore, the slope of external behavior is set according to welding condition, so that the arc length control system is stable.In the past, by diameter, material and the output current (welding wire feeding speed) according to welding method, welding wire, changed the slope of external behavior, adjusted the gain of arc length control system, and sought to stablize.For example, at CO
2In the situation of/MAG welding, external behavior L1 as shown in the drawing is such, is set as slope setting value Kr=-0.03.On the other hand, in the situation of pulse electric arc welding, external behavior L2 as shown in the figure is such, is set as slope setting value Kr=-0.1.Make like this arc length control system stable, conditions at the arc good (for example, with reference to patent documentation 1).
Fig. 5 is the current/voltage oscillogram of consumable electrode AC arc welding.This figure (A) expression polarity switching signal Spn, this figure (B) expression output current Iw, this figure (C) expression weldingvoltage Vw.This figure is the situation that short circuiting arc welding connects, but the situations such as particle transfer welding, spray transfer welding are also roughly the same.The value representation absolute value of output current Iw, weldingvoltage Vw and output voltage E described later, external behavior slope etc. in the following description.Therefore, the large such record of value is the large meaning of absolute value.Describe referring to this figure.
Shown in this figure (A), in consumable electrode AC arc welding, alternately switch Tep during the predetermined electrode straight polarity and predetermined electrode negative polarity according to polarity switching signal Spn during Ten weld.At moment t1, when switching to electrode straight polarity EP, shown in this figure (B), by the output current iw of electrode straight polarity EP, shown in this figure (C), the weldingvoltage Vw of electrode straight polarity EP is applied between welding wire and the mother metal.So among the Ts, shown in this figure (B), output current Iw increases gradually during the short circuit of moment t1～t2, shown in this figure (C), weldingvoltage Vw is the low short-circuit voltage value that has reduced about several V.In the arc period Ta of moment t2～t3, shown in this figure (B), output current Iw reduces gradually, and shown in this figure (C), weldingvoltage Vw is the arc voltage value about tens of V.After this, Ts and arc period Ta during the repetition short circuit are until till Tep finishes during the electrode straight polarity of moment t4.
At moment t4, shown in this figure (A), polarity switching signal Spn is low level, when the output switching of the source of welding current is electrode negative polarity EN, shown in this figure (B), by the output current Iw of electrode negative polarity EN, shown in this figure (C), apply weldingvoltage Vw.With above-mentioned same, repeat during the short circuit of t4～t5 constantly Ts and the arc period Ta of t5～t6 constantly, until till Ten finishes during the electrode negative polarity of t7 constantly.
External behavior in the consumable electrode AC arc welding power supply according to the absolute value of output current Iw and weldingvoltage Vw, is similarly controlled with dc source.Therefore, even in the consumable electrode AC arc welding, the external behavior slope is set to appropriate value according to welding condition and welds (for example with reference to patent documentation 2).
Patent documentation 1: TOHKEMY 2002-254172 communique
Patent documentation 2: TOHKEMY 2004-114088 communique
As mentioned above, in consumable electrode arc welding, in order to obtain good welded condition, the stable of arc length control system is very important.Therefore, by according to welding condition the external behavior slope being set as suitableization of gain (gain) that appropriate value makes the arc length control system.Namely by the external behavior slope being set as the external behavior slope of the particle transfer mode that is fit to electric arc, can obtain good welded condition.Therefore, in the prior art, because CO
2Weld different with welding transition mode in the pulse electric arc welding, so the external behavior slope is set as the value that is suitable for various welding methods.
In consumable electrode AC arc welding, similarly, according to the welding conditions such as kind of quality of parent material, wire feed rate, protective gas the external behavior slope is suitably changed.Welded condition in the time of can obtaining good electrode straight polarity EP thus, but, external behavior slope when keeping electrode straight polarity EP is constant when carrying out the welding of electrode negative polarity, and the arc length control system then is difficult to keep stable because gain (gain) is excessive.Its result compares with the consumable electrode arc welding of direct current, and in the consumable electrode AC arc welding, welded condition becomes labile state easily.
Summary of the invention
Therefore, the object of the invention is to, the output control method of the stable consumable electrode AC arc welding power supply of a kind of welded condition that consumable electrode AC arc is welded is provided.
In order to address the above problem, the output control method of the consumable electrode AC arc welding power supply of technical solution of the present invention one, the external behavior slope that is used for alternately switching the source of welding current of the consumable electrode AC arc welding that electrode straight polarity and electrode negative polarity weld according to welding condition control
The said external characteristic slope, when above-mentioned electrode straight polarity, set the first external behavior slope for, set the absolute value second external behavior slope larger than the absolute value of above-mentioned the first external behavior slope when above-mentioned electrode negative polarity for, these first and second external behavior slopes are set according to the mode that makes the welded condition stabilisation under the corresponding respectively polarity.
Technical solution of the present invention two according to the output control method of technical scheme one described consumable electrode AC arc welding power supply, is set above-mentioned the first external behavior slope according to the material of mother metal and the kind of protective gas.
The invention effect
According to the invention described above, in consumable electrode AC arc welding power supply, during electrode straight polarity EP and the external behavior slope during electrode negative polarity EN, set according to the mode that under each polarity, obtains good welded condition, can make thus the arc length control system under each polarity stable.Therefore can improve the stability of consumable electrode AC arc welding, carry out high-quality welding.
According to technique scheme two of the present invention; except above-mentioned effect; external behavior slope in the time of can also changing electrode straight polarity EP according to the kind of quality of parent material and protective gas is even the kind of quality of parent material and protective gas changes the stability that also can keep welded condition thus.
Description of drawings
Fig. 1 is the block diagram of the relevant consumable electrode AC arc welding power supply of embodiments of the present invention.
Fig. 2 is the figure of expression the present invention external behavior of being correlated with.
Fig. 3 is the sequential chart of each signal of the source of welding current of Fig. 1.
Fig. 4 is the figure of expression external behavior of the prior art.
Fig. 5 is the current/voltage oscillogram of consumable electrode AC arc welding.
Symbol description among the figure: 1-welding wire; The 2-mother metal; 3-electric arc; The 4-welding gun; The 5-thread delivering roller; D2-secondary rectifier group; The E-output voltage; The EA-error amplifying circuit; The Ea-error amplification signal; The ECR-external behavior forms circuit; Ecr-output voltage setting signal; The ED-voltage detecting circuit; The Ed-voltage sense signal; EN-electrode negative polarity; END-electrode negative polarity switch element driver circuit; End-electrode negative polarity switch element drives signal; The EP-electrode straight polarity; EPD-electrode straight polarity switch element driver circuit; Epd-electrode straight polarity switch element drives signal; The ID-current detection circuit; The Id-current detection signal; The INT-high frequency transformer; The INV-inverter circuit; IR-output current a reference value circuit; Ir-output current a reference value signal; The iw-output current; KR-external behavior slope initialization circuit; Kr-external behavior slope setting signal; Kr1-the first external behavior slope setting value; Kr2-the second external behavior slope setting value; L1～L2-external behavior; NTR-electrode negative polarity switch element; PTR-electrode straight polarity switch element; The PWM-pulse width modulation circuit; The Pwm-pulse width modulating signal; Spn-polarity switching signal; The Ta-arc period; During the Ten-electrode negative polarity; During the Tep-electrode straight polarity; During the Ts-short circuit; VR-weldingvoltage a reference value circuit; Vr-weldingvoltage a reference value signal; The Vw-weldingvoltage; The WL-reactor.
The implementation form
Below, with reference to accompanying drawing embodiments of the present invention are described.
Fig. 1 is the block diagram of the relevant consumable electrode arc welding power source of expression embodiments of the present invention.Referring to this figure each functional block is described.
Inverter circuit INV inputs the source power supplies such as 3 phase 200V, carries out inversion control according to the DC voltage of pulse width modulating signal Pwm described later after to rectification, the output high-frequency ac.High frequency transformer INT is transformed to high-frequency ac the magnitude of voltage that is suitable for welding.The high-frequency ac of secondary rectifier group D2 after to conversion carries out rectification, the DC voltage of output positive and negative.By electrode straight polarity switch element PTR and electrode negative polarity switch element NTR are carried out ON/OFF control, switch the output polarity of the source of welding current.Being electrode straight polarity EP when electrode straight polarity switch element PTR is the ON state, is electrode negative polarity EN when electrode negative polarity switch element NTR is the ON state.Reactance WL is used for output is carried out smoothly.
Electrode straight polarity switch element driver circuit EPD, output electrode positive polarity switch element drives signal Epd when the polarity switching signal Spn from the outside is high level.Output electrode negative polarity switch element drove signal End when electrode negative polarity switch element driver circuit END was low level at above-mentioned polarity switching signal Spn.Therefore, when polarity switching signal Spn is high level, being electrode straight polarity EP, is electrode negative polarity EN when low level.
External behavior slope initialization circuit KR, when above-mentioned polarity switching signal Spn is high level (EP), the first external behavior slope setting value Kr1 is exported as external behavior slope setting signal Kr, during for low level (EN), the second external behavior slope setting value Kr2 is exported as external behavior slope setting signal Kr.External behavior slope during the first external behavior slope setting value Kr1 setting electrode straight polarity among the Tep is in the scope about-0.01～-0.03 (V/A).External behavior slope during the second external behavior slope setting value Kr2 setting electrode negative polarity among the Ten is in the scope about-0.06～-0.1 (V/A).Therefore, | Kr1|＜| kr2|.The predetermined weldingvoltage a reference value signal Vr of weldingvoltage a reference value circuit VR output.Output current a reference value circuit I R, the output current a reference value signal Ir that output is predetermined.Current detection circuit ID detects ac output current Iw and is transformed to absolute value, output electric current measure signal Id.External behavior forms circuit ECR, take above-mentioned current detection signal Id, weldingvoltage a reference value signal Vr, output current a reference value signal Ir and external behavior slope setting signal Kr as input, calculate Ecr=Kr * (Id-Ir)+Vr according to above-mentioned formula (1), export as output voltage setting signal Ecr.Fig. 2 has represented this output.External behavior L1, the external behavior during expression electrode straight polarity EP, the situation during for Ecr=Kr1 * (Id-Ir)+Vr.In addition, the external behavior when external behavior L2 represents electrode negative polarity EN is the situation of Ecr=Kr2 * (Id-Ir)+Vr.Form circuit ECR by the said external characteristic and form the external behavior of expectation at the output output voltage setting signal Ecr corresponding with the value of current detection signal Id constantly.
Voltage detecting circuit ED, the alternating voltage (output voltage E) of the secondary coil of detection high frequency transformer INT also is transformed to absolute value, output voltage sense signal Ed.Error amplifying circuit EA amplifies error between above-mentioned output voltage setting signal Ecr and the voltage sense signal Ed, output error amplifying signal Ea.Pulse width modulation circuit PWM take this error amplification signal Ea as input, carries out pulse width modulation, output pulse width modulation signal Pwm.
Fig. 3 represents each signal timing diagram of the source of welding current shown in Figure 1.This figure (A) expression polarity switching signal Spn, this figure (B) expression output current Iw, this figure (C) expression weldingvoltage Vw, this figure (D) expression electrode straight polarity switch element drives signal Epd, this figure (E) expression electrode negative polarity switch element drives signal End, this figure (F) expression external behavior slope setting signal Kr.Below, describe with reference to this figure.
Shown in this figure (A), when polarity switching signal Spn is high level, shown in this figure (D), because output electrode positive polarity switch element drives signal Epd (high level), so electrode straight polarity switch element PTR is conducting state, the source of welding current is output as electrode straight polarity EP.Among the Tep, shown in this figure (B), by the output current Iw of electrode straight polarity EP, shown in this figure (C), between welding wire 1 and mother metal 2, be applied in the weldingvoltage Vw of electrode straight polarity EP during this electrode straight polarity.In addition, shown in this figure (F), the value of external behavior slope setting signal Kr is the first external behavior slope setting value Kr1, forms the external behavior L1 described in Fig. 2.
At moment t2, shown in this figure (A), when polarity switching signal Spn is low level, shown in this figure (E), because output electrode negative polarity switch element drives signal End (high level), so electrode negative polarity switch element NTR is conducting state, the source of welding current is output as electrode negative polarity EN.Among the Ten, shown in this figure (B), by the output current Iw of electrode negative polarity EN, shown in this figure (C), be applied in the weldingvoltage Vw of electrode negative polarity EN during this electrode negative polarity.In addition, shown in this figure (F), the value of external behavior slope setting signal Kr is the second external behavior slope setting value Kr2, forms the external behavior L2 described in Fig. 2.
Above-mentioned the first external behavior slope setting value Kr1 and the second external behavior slope setting value Kr2 make it be changed to appropriate value according to welding condition.Particularly, the first external behavior slope setting value Kr1 need to change according to the kind of quality of parent material and protective gas.At this moment, the second external behavior slope setting value Kr2 can constantly also can be identical value.According to the CO2 welding of iron and steel, the MAG welding of iron and steel and the order of stainless MIG welding, the second external behavior slope setting value Kr2 for example is set as-0.01 ,-0.02 ,-0.03.In the above-described embodiment, illustration the situation of short circuiting arc welding, but the present invention also goes for the situations such as particle transfer welding, spray transfer welding, pulse electric arc welding.
According to above-mentioned embodiment, in consumable electrode AC arc welding power supply, during electrode straight polarity EP and the external behavior slope during electrode negative polarity EN, set according to the mode that under each polarity, obtains good welded condition, can make thus the arc length control system under each polarity stable.Therefore can improve the stability of consumable electrode AC arc welding, carry out high-quality welding.In addition, the external behavior slope in the time of can changing electrode straight polarity EP according to the kind of quality of parent material and protective gas thus, even the kind of quality of parent material and protective gas changes, also can be kept the stability of welded condition.
Claims (2)
1. the output control method of a consumable electrode AC arc welding power supply is used for alternately switching the external behavior slope of the source of welding current of the consumable electrode AC arc welding that electrode straight polarity and electrode negative polarity weld according to welding condition control,
The said external characteristic slope, when above-mentioned electrode straight polarity, set the first external behavior slope for, set the absolute value second external behavior slope larger than the absolute value of above-mentioned the first external behavior slope when above-mentioned electrode negative polarity for, these first and second external behavior slopes are set according to the mode that makes the welded condition stabilisation under the corresponding respectively polarity.
2. the output control method of consumable electrode AC arc welding power supply according to claim 1 is characterized in that,
Set above-mentioned the first external behavior slope according to the material of mother metal and the kind of protective gas.
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| JP2007061376A JP5090759B2 (en) | 2007-03-12 | 2007-03-12 | Output control method for consumable electrode AC arc welding power supply |
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| JP2010075944A (en) * | 2008-09-25 | 2010-04-08 | Daihen Corp | Ac arc welding machine |
| JP2013043209A (en) * | 2011-08-25 | 2013-03-04 | Daihen Corp | Welding power source |
| JP7017979B2 (en) * | 2018-04-26 | 2022-02-09 | 株式会社神戸製鋼所 | Welding power supply and welding power supply control method |
| CN113210802B (en) * | 2021-04-14 | 2022-11-18 | 上海广为焊接设备有限公司 | Auxiliary pilot arc circuit and method for alternating current-direct current argon arc welding |
Citations (6)
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| GB1172322A (en) * | 1966-11-22 | 1969-11-26 | Gen Dynamics Corp | Arc Welding System and Process |
| JP2002254172A (en) * | 2001-03-05 | 2002-09-10 | Daihen Corp | Outside characteristic control method for welding source device |
| JP2002361147A (en) * | 2001-06-01 | 2002-12-17 | Matsushita Electric Ind Co Ltd | Application apparatus for viscous liquid |
| CN1593828A (en) * | 2003-09-12 | 2005-03-16 | 株式会社大亨 | Pulse arc welding output control method and arc length variation pulse arc welding output control method |
| CN1775444A (en) * | 2004-11-17 | 2006-05-24 | 株式会社大亨 | Polarity switching short circuiting arc welding method |
| JP4333368B2 (en) * | 2004-01-07 | 2009-09-16 | 株式会社村田製作所 | Manufacturing method of electronic parts |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2670144B2 (en) * | 1989-05-31 | 1997-10-29 | 三菱重工業株式会社 | Gas metal arc welding method |
| JP2892198B2 (en) * | 1991-09-30 | 1999-05-17 | 株式会社神戸製鋼所 | Consumable electrode type AC pulse arc welding method |
| JPH11104830A (en) * | 1997-09-30 | 1999-04-20 | Daihen Corp | Welding arc length control method and arc welding equipment |
| JP4676081B2 (en) * | 2001-03-28 | 2011-04-27 | 株式会社ダイヘン | Output control method for pulse arc welding power supply |
| JP2005349406A (en) * | 2004-06-08 | 2005-12-22 | Daihen Corp | Method for discriminating short circuit of ac pulsed arc welding |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1172322A (en) * | 1966-11-22 | 1969-11-26 | Gen Dynamics Corp | Arc Welding System and Process |
| JP2002254172A (en) * | 2001-03-05 | 2002-09-10 | Daihen Corp | Outside characteristic control method for welding source device |
| JP2002361147A (en) * | 2001-06-01 | 2002-12-17 | Matsushita Electric Ind Co Ltd | Application apparatus for viscous liquid |
| CN1593828A (en) * | 2003-09-12 | 2005-03-16 | 株式会社大亨 | Pulse arc welding output control method and arc length variation pulse arc welding output control method |
| JP4333368B2 (en) * | 2004-01-07 | 2009-09-16 | 株式会社村田製作所 | Manufacturing method of electronic parts |
| CN1775444A (en) * | 2004-11-17 | 2006-05-24 | 株式会社大亨 | Polarity switching short circuiting arc welding method |
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| JP2008221269A (en) | 2008-09-25 |
| JP5090759B2 (en) | 2012-12-05 |
| CN101264544A (en) | 2008-09-17 |
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