CN101683700A - Ac electric arc welding machine - Google Patents
Ac electric arc welding machine Download PDFInfo
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- CN101683700A CN101683700A CN200910171200A CN200910171200A CN101683700A CN 101683700 A CN101683700 A CN 101683700A CN 200910171200 A CN200910171200 A CN 200910171200A CN 200910171200 A CN200910171200 A CN 200910171200A CN 101683700 A CN101683700 A CN 101683700A
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Abstract
The invention provides a AC electric arc welding machine, which includes a direct current supply circuit; an output main transformer of an inverter circuit and a transformation inverter circuit; a reactor for smoothing output of the secondary rectification circuit; a polar commutation circuit composed of the first switching element as well as the second switching element; a polar switching and driving circuit for driving the polar commutation circuit; a feed motor drive circuit for driving welding wire feed motor; a master control circuit, which controls the feed motor drive circuit, and conducts the first switching element as well as the second switching element, when inputting the welding start signal, until the welding wire and the welded article are contacted; when the reactor is energized with a saturation current, and the welding wire is contacted with the welded article, the master control circuit controls the polar switching drive circuit, thereby conducting the first switchingelement as well as the second switching element interactively. Besides the principal windings of the reactor, the existing AC electric arc welding machine is also added with an auxiliary windings, and the auxiliary winding is energized with current for decreasing electric inductance value, thereby the arc strike is excellent.
Description
Technical field
The present invention relates in ac arc welder, welding wire contacts with soldered thing and striking when carrying out striking (arc start) improves.
Background technology
Ac arc welder makes reactor (reactor) be in saturation state when striking, reduces inductance value, carries out the improvement of striking.
Fig. 4 is the electrical connection graph of the ac arc welder of prior art.
The auxiliary winding saturable reactor DWL of band shown in Fig. 4 is for except omitting illustrated main winding Nm, the saturable reactor of additional auxiliary winding Nc, this auxiliary winding Nc is connected with the accessory power supply PC that is made of constant-current source CC and accessory power supply switch element TR3.Be in the auxiliary winding current Ic of saturation state from the auxiliary winding saturable reactor DWL of constant-current source CC energising band.
The welding current of switching in the main winding Nm of the auxiliary winding saturable reactor DWL of band shown in Figure 4 is to the auxiliary winding current of auxiliary winding Nc energising.And ratio of winding Nm: Nc is about for example 1: 1～1: 5.
Next, work is described.
When welding commencing signal Ts shown in Figure 4 was transfused to, the beginning welding wire was initially to give giving of speed.Simultaneously, accessory power supply switch element TR3 conducting is assisted winding current Ic from accessory power supply PC to auxiliary winding Nc energising.This current value is IcNc＞ItNm, for be in the value of saturation state with auxiliary winding saturable reactor.
When welding wire WW shown in Figure 4 contacted with soldered thing M, weldingvoltage Vd changed to short-circuit voltage (roughly no-voltage) from non-load voltage.The corresponding main control circuit SCP of accessory power supply this moment when weldingvoltage Vd becomes roughly no-voltage, is judged as welding wire WW and contacts with soldered thing M, stops to assist the energising of winding current Ic.At this moment, the auxiliary winding saturable reactor DWL of band, owing to be in saturation state by the energising of auxiliary winding current Ic, so inductance value diminishes, it is very big that the climbing of initial current becomes.Its result, electric arc is easy to generate, to the alternating current arc welding transition.
As mentioned above, use and in reactor, also pay the saturable that has added auxiliary winding Nc reactor, the initial property of improvement electric arc except main winding Nm.(for example consumable electrode arc welding power source of patent documentation 1)
[patent documentation 1] TOHKEMY 2006-43764 communique
Existing ac arc welder shown in Figure 4, in order to improve striking, also pay except the main winding of reactor and to add auxiliary winding and be used as the saturable reactor, the accessory power supply PC that setting is made of constant-current source CC and accessory power supply switch element TR3, when striking, be in the auxiliary winding current Ic of saturation state from the auxiliary winding of constant-current source CC energising reactor, making reactor saturated and reduce to carry out striking under the state of inductance value, seek the improvement of striking.
But in said method, it is complicated that the structure of reactor becomes, and need auxiliary power circuit, thereby stop price to descend.
Summary of the invention
At this, the objective of the invention is to, a kind of ac arc welder that does not need to have the reactor of labyrinth is provided.
In order to solve above-mentioned problem, the technical characterictic of the ac arc welder of the technical program is to possess: DC power supply circuit, and it carries out rectification, output dc voltage to commercial ac power source; Inverter circuit, it is a high-frequency ac voltage with above-mentioned dc voltage conversion; Main transformer, its output transform with above-mentioned inverter circuit is the high-frequency ac voltage that is suitable for electric arc processes; Secondary rectification circuit, rectification is carried out in its output to above-mentioned main transformer; Reactor, it is undertaken smoothly by the output of rectification above-mentioned; Polarity switching circuit, it switches to electrode straight polarity and electrode negative polarity by the output with above-mentioned reactor and the 1st switch element and the 2nd switch element that supply to arc load constitutes; The polarity switch driving circuit, above-mentioned the 1st switch element of its conducting and above-mentioned the 2nd switch element; Welding wire is given motor, and it is given welding wire to soldered thing; Feed motor drive circuit, it drives welding wire and gives motor; Main control circuit, it is when the input of welding commencing signal, control above-mentioned feed motor drive circuit, simultaneously above-mentioned the 1st switch element of conducting and above-mentioned the 2nd switch element up to above-mentioned welding wire with till above-mentioned soldered thing contacts, control above-mentioned polarity switch driving circuit so that the saturation current of in above-mentioned reactor, switching on, next when above-mentioned welding wire contacts with above-mentioned soldered thing, control above-mentioned polarity switch driving circuit so that above-mentioned the 1st switch element and the alternately conducting of above-mentioned the 2nd switch element.
The 2nd technical scheme, according to the described ac arc welder of the 1st technical scheme, it is characterized in that, between above-mentioned reactor and above-mentioned the 2nd switch element, the saturation current testing circuit is set, above-mentioned main control circuit, according to the value of the saturation current detection signal that detects by above-mentioned saturation current testing circuit the saturation current of above-mentioned reactor is carried out constant current control, begin to give and with till above-mentioned soldered thing contacts up to above-mentioned welding wire.
In ac arc welder of the present invention, at when beginning welding control polarity switch driving circuit, conducting the 1st switch element and the 2nd switch element simultaneously, energising saturation current in reactor and make reactor saturated.Next, when welding wire contacts with soldered thing, control polarity switch driving circuit, side in conducting the 1st switch element or above-mentioned the 2nd switch element and when carrying out striking, in order to carry out striking under the little state of the inductance value of reactor, initial current sharply increases, and improves striking.
And then, owing to need also not pay saturable reactor, constant-current source that adds auxiliary winding and the accessory power supply that constitutes by the accessory power supply switch element, therefore can realize the miniaturization of goods and the reduction of price except the main winding of reactor.
In the 2nd technical scheme, by value saturation current is carried out constant current control, thereby can make reactor be in the high saturation state of precision with regulation, seek the further improvement of striking.
Description of drawings
Fig. 1 is the electrical connection graph of the relevant ac arc welder of embodiments of the present invention 1.
Fig. 2 is the waveform sequential chart that is used to illustrate the work of embodiment 1.
Fig. 3 is the electrical connection graph of the relevant ac arc welder of embodiment 2.
Fig. 4 is the electrical connection graph of the ac arc welder of prior art.
[symbol description]
AC exchanges commercial voltage
CK polarity switch driving circuit
Ck polarity is switched the driving signal
The C1 smmothing capacitor
D1 the 1st diode
D2 the 2nd diode
D3 the 3rd diode
D4 the 4th diode
No. 1 rectification circuit of DR1
The DR2 secondary rectification circuit
The DL reactor
The IK inverter driving circuit
The Ik inverter drives signal
The ID output current detection circuit
Id output current detection signal
ID2 the 2nd output current detection circuit
Id the 2nd output current detection signal
IR output current initialization circuit
The INV inverter circuit
The INT main transformer
The M machined object
The MD feed motor drive circuit
Md gives motor drive signal
The SC main control circuit
Sc exports control signal
SCK polarity is switched corresponding main control circuit
TH welding torch (torch)
TR1 the 1st switch element
TR2 the 2nd switch element
Tr1 the 1st switch element drives signal
Tr2 the 2nd switch element drives signal
The VD output voltage detecting circuit
The VM welding wire is given motor
The Vm welding wire is given signal
VR output voltage initialization circuit
WW electrode (welding wire)
The specific embodiment
Fig. 1 is the electrical connection graph of the relevant ac arc welder of embodiments of the present invention 1.
In the figure, DC power supply circuit is formed by No. 1 rectification circuit DR1 and smmothing capacitor C4, and commercial ac power source is carried out rectification and level and smooth and output dc voltage.
Inverter circuit INV forms full-bridge circuit (full bridge) by omitting illustrated opposed four switch elements, is that high-frequency ac voltage is exported with dc voltage conversion.
Main transformer INT, to be transformed to the high-frequency ac voltage that is suitable for electric arc processes by the high-frequency ac voltage of inverter circuit INV conversion, outlet side at main transformer INT is provided with three terminals, with intermediate terminal as zero output, one side's terminal is as positive output, the opposing party's terminal is exported high-frequency ac voltage as negative output.Secondary rectification circuit is formed by the 1st diode D1～the 4th diode D4, imports above-mentioned positive output and above-mentioned negative output, carries out rectification and generates positive voltage and negative voltage.
Polarity switching circuit, form half-bridge circuit (Ha-Off Block リ Star ジ) by the 1st switch element TR1 and the 2nd switch element TR2, the 1st switch element TR1 switches to electrode straight polarity and will supply with arc load from the positive voltage electric power of secondary rectification circuit, and the 2nd switch element TR2 switches to the electrode negative polarity and negative voltage electric power is supplied with arc load.
Main control circuit SC is according to welding commencing signal Ts, relatively the coming of the output current setting value Ir of the regulation of setting based on the value of the output current detection signal Id that is detected by output current detection circuit ID with by output current initialization circuit IR carries out PWM control to the pulse width of main control signal Sc, and output polarity driven signal Ck that polarity switch driving circuit CK is controlled.
In addition, the comparison of the output voltage setting value Vr of the regulation that main control circuit SC sets based on the value of the voltage sense signal Vd that is detected by output voltage detecting circuit VD with by output voltage initialization circuit VR, output is given the welding wire that the rotation number of motor VM controls to welding wire and is given signal Vm.Feed motor drive circuit MD gives signal Vm with welding wire and is transformed to and gives motor drive signal Md and drive welding wire and give motor VM.
Polarity switch driving circuit CK, output drives signal Tr1 and the 2nd switch element driving signal Tr2 according to the 1st switch element that polarity driven signal Ck drives the 1st switch element TR1 and the 2nd switch element TR2.
Fig. 2 is the waveform sequential chart that is used to illustrate the work of embodiments of the present invention 1.
Among Fig. 2, the waveform of this figure (A) represents to weld commencing signal Ts, the waveform of this figure (B) is represented voltage sense signal Vd, the waveform of this figure (C) is represented output current detection signal Id, the waveform of this figure (D) represents that the 1st switch element drives signal Tr1, the waveform of this figure (E) represents that the 2nd switch element drives signal Tr2, and the waveform of this figure (F) represents that welding wire gives signal Vm, and the waveform of this figure (G) is represented the long Lw of electric arc.
Next, adopt the waveform sequential chart of Fig. 2 to come the work of embodiments of the present invention 1 is described.At the moment t=t1 shown in Fig. 2 (A), when welding commencing signal Ts is input to main control circuit SC, main control circuit SC control polarity switch driving circuit CK, to scheme the 1st switch element shown in (D) and drive signal Tr1 and the 2nd switch element and drive signal Tr2 and export simultaneously, and export the initial welding wire shown in this figure (F) and give signal Vm.
At moment t=t1, the 1st switch element TR1 shown in Figure 1 and the 2nd switch element TR2 conducting simultaneously, the reactor DL saturation current (for example 100A) of switching on, and welding wire is given motor VM gives signal Vm based on initial welding wire value Vmi and is begun to give welding wire WW to soldered thing M.
At moment t=t1～t2, the 1st switch element TR1 and the 2nd switch element TR2 conducting, the saturation current of switching among the reactor DL, the value Vmi that the motor VM that is in saturation state and feed apparatus gives signal Vm based on initial welding wire continues giving of welding wire WW.
At moment t=t2, main control circuit SC, in the value of the voltage sense signal Vd that detects by output voltage detecting circuit VD when roughly zero, being judged as welding wire WW contacts with soldered thing M, stop the output that the 2nd switch element shown in Fig. 2 (E) drives signal Tr2, cut off the 2nd switch element TR2.
At moment t=t2, when welding wire WW contacts with soldered thing M, begin the energising of the initial current Is shown in Fig. 2 (C) via the 1st switch element TR1.
At moment t=t2～t3, when welding wire WW contacted with soldered thing M, main control circuit SC control inverter circuit I NV controlled initial current Is.At this moment, reactor DL is owing to the energising saturation current is in saturation state, so the climbing of initial current Is becomes very high, and electric arc is easy to generate.
At moment t=t3, electric arc produces, and it is bigger than the basic Quasi magnitude of voltage Vrf that omits illustrated regulation that the value Vp of voltage sense signal Vd becomes, and main control circuit SC is judged as electric arc and produces, beginning initial current Is.For example carry out the transition to the stable electric current I p of electrode straight polarity, from little electric arc to common electric arc transition.
At moment t=t3, when little electric arc shown in Figure 2 produced, the value Vmi that gives signal Vm from initial welding wire changed to stable value Vmu.
At moment t=t4, the 1st switch element TR1 cuts off, and the 2nd switch element TR2 conducting, switches to the electrode negative polarity from electrode straight polarity, carries out the transition to the stable electric current I n of electrode negative polarity.And, with the polarity of stable cycle switching electrode, continue the generation of alternating current arc later on.
According to above-mentioned, polarity switch driving circuit CK while conducting the 1st switch element TR1 and the 2nd switch element TR2 when the welding beginning, make it saturated to reactor energising saturation current, next when welding wire WW contacts with soldered thing M, for example cut off the 2nd switch element TR2, when conducting the 1st switch element TR1 carries out striking, in order under the little state of the inductance value of reactor, to carry out striking, initial current sharply increases, and it is good that striking becomes.In addition, in above-mentioned, to cut off the 2nd switch element TR2, the electrode straight polarity of conducting the 1st switch element TR1 is carried out striking, but also can cut off the 1st switch element TR1 conversely, the electrode negative polarity of conducting the 2nd switch element TR2 carries out striking.
Fig. 3 is the electrical connection graph of the relevant ac arc welder of embodiment 2, in the figure, carry out same action with the formation thing of the electrical connection graph same-sign of ac arc welder shown in Figure 1, therefore omit explanation, only the different formation thing of symbol is described.
At moment t=t1 shown in Figure 2, the 1st switch element TR1 shown in Figure 1 and the 2nd switch element TR2 conducting simultaneously, the reactor DL saturation current (for example 100A) of switching on, and welding wire is given motor VM gives signal Vm based on initial welding wire value Vmi and is begun to give welding wire WW to soldered thing M.
Saturation current testing circuit ID2 shown in Figure 3 is arranged between reactor DL and the 2nd switch element TR2, detects the saturation current of reactor DL and exports as saturation current detection signal Id2.
At moment t=t1～t2 shown in Figure 2, main control circuit SC, based on the value of the saturation current detection signal Id2 that detects by the saturation current setting value of omitting the regulation that illustrated saturation current initialization circuit sets with by saturation current testing circuit ID2, the saturation current of switching on is carried out constant current control in reactor DL.
At moment t=t2 shown in Figure 2, main control circuit SC, in the value of the voltage sense signal Vd that detects by output voltage detecting circuit VD when roughly zero, being judged as welding wire contacts with soldered thing, the constant current control of the saturation current that end is switched in reactor DL, and stop the output that the 2nd switch element shown in Fig. 2 (E) drives signal Tr2, cut off the 2nd switch element TR2.
At moment t=t2, when welding wire WW contacts with soldered thing M, begin the energising of the initial current Is shown in Fig. 2 (C) via the 1st switch element TR1.And, carry out action same as described above later on, therefore omit explanation.
Claims (2)
1. ac arc welder is characterized in that possessing:
DC power supply circuit, it carries out rectification, output dc voltage to commercial ac power source;
Inverter circuit, it is a high-frequency ac voltage with above-mentioned dc voltage conversion;
Main transformer, its output transform with above-mentioned inverter circuit is the high-frequency ac voltage that is suitable for electric arc processes;
Secondary rectification circuit, rectification is carried out in its output to above-mentioned main transformer;
Reactor, it is undertaken smoothly by the output of rectification above-mentioned;
Polarity switching circuit, it switches to electrode straight polarity and electrode negative polarity by the output with above-mentioned reactor and the 1st switch element and the 2nd switch element that supply to arc load constitutes;
The polarity switch driving circuit, above-mentioned the 1st switch element of its conducting and above-mentioned the 2nd switch element;
Welding wire is given motor, and it is given welding wire to soldered thing;
Feed motor drive circuit, it drives welding wire and gives motor; With
Main control circuit, it is when the input of welding commencing signal, control above-mentioned feed motor drive circuit, simultaneously above-mentioned the 1st switch element of conducting and above-mentioned the 2nd switch element up to above-mentioned welding wire with till above-mentioned soldered thing contacts, control above-mentioned polarity switch driving circuit so that the saturation current of in above-mentioned reactor, switching on, next when above-mentioned welding wire contacts with above-mentioned soldered thing, control above-mentioned polarity switch driving circuit so that above-mentioned the 1st switch element and the alternately conducting of above-mentioned the 2nd switch element.
2. ac arc welder according to claim 1 is characterized in that,
Between above-mentioned reactor and above-mentioned the 2nd switch element, the saturation current testing circuit is set,
Above-mentioned main control circuit carries out constant current control according to the value of the saturation current detection signal that is detected by above-mentioned saturation current testing circuit to the saturation current of above-mentioned reactor, begins to give and with till above-mentioned soldered thing contacts up to above-mentioned welding wire.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008245463 | 2008-09-25 | ||
| JP2008-245463 | 2008-09-25 | ||
| JP2008245463A JP2010075944A (en) | 2008-09-25 | 2008-09-25 | Ac arc welding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101683700A true CN101683700A (en) | 2010-03-31 |
| CN101683700B CN101683700B (en) | 2014-12-31 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910171200.2A Expired - Fee Related CN101683700B (en) | 2008-09-25 | 2009-09-15 | Ac electric arc welding machine |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2010075944A (en) |
| CN (1) | CN101683700B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102574235A (en) * | 2010-09-01 | 2012-07-11 | 松下电器产业株式会社 | Alternating current tig welding method |
| CN105149748A (en) * | 2015-10-14 | 2015-12-16 | 刘昇澔 | Alternating current-direct current consumable electrode welding machine |
| CN108672892A (en) * | 2018-05-31 | 2018-10-19 | 张胜男 | A kind of novel TIG weldering external promotion arc strike control devices |
| CN110605459A (en) * | 2018-06-15 | 2019-12-24 | 株式会社达谊恒 | Welding power supply device |
| CN113210802A (en) * | 2021-04-14 | 2021-08-06 | 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 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6444271B2 (en) * | 2015-06-25 | 2018-12-26 | 株式会社三社電機製作所 | AC output inverter welding machine |
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| CN1137962A (en) * | 1995-06-15 | 1996-12-18 | 金华市高科技开发有限公司 | A.C. electric welder |
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| CN1634676A (en) * | 2005-01-13 | 2005-07-06 | 上海交通大学 | Full-digital speed change control method for wire feeding for submerged arc welding |
| CN1803369A (en) * | 2005-01-13 | 2006-07-19 | 株式会社大亨 | Arc start control method for AC arc welding |
| CN101036956A (en) * | 2006-03-16 | 2007-09-19 | 株式会社大亨 | Electrode fused arc welding machine |
| CN101058124A (en) * | 2006-04-20 | 2007-10-24 | 株式会社大亨 | Polarity switching method for consumable electrode AC pulse arc welding |
| CN101264544A (en) * | 2007-03-12 | 2008-09-17 | 株式会社大亨 | Output control method for consumable electrode AC arc welding power supply |
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2008
- 2008-09-25 JP JP2008245463A patent/JP2010075944A/en active Pending
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| CN1137962A (en) * | 1995-06-15 | 1996-12-18 | 金华市高科技开发有限公司 | A.C. electric welder |
| JP2002224828A (en) * | 2001-02-07 | 2002-08-13 | Daihen Corp | Method for controlling power source for arc machine, and power source device |
| CN1634676A (en) * | 2005-01-13 | 2005-07-06 | 上海交通大学 | Full-digital speed change control method for wire feeding for submerged arc welding |
| CN1803369A (en) * | 2005-01-13 | 2006-07-19 | 株式会社大亨 | Arc start control method for AC arc welding |
| CN101036956A (en) * | 2006-03-16 | 2007-09-19 | 株式会社大亨 | Electrode fused arc welding machine |
| CN101058124A (en) * | 2006-04-20 | 2007-10-24 | 株式会社大亨 | Polarity switching method for consumable electrode AC pulse arc welding |
| CN101264544A (en) * | 2007-03-12 | 2008-09-17 | 株式会社大亨 | Output control method for consumable electrode AC arc welding power supply |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102574235A (en) * | 2010-09-01 | 2012-07-11 | 松下电器产业株式会社 | Alternating current tig welding method |
| CN102574235B (en) * | 2010-09-01 | 2014-12-31 | 松下电器产业株式会社 | Alternating current tig welding method |
| CN104526130A (en) * | 2010-09-01 | 2015-04-22 | 松下电器产业株式会社 | Alternating current TIG welding method |
| CN104526130B (en) * | 2010-09-01 | 2016-09-28 | 松下知识产权经营株式会社 | AC-TIG WELDING welder |
| CN105149748A (en) * | 2015-10-14 | 2015-12-16 | 刘昇澔 | Alternating current-direct current consumable electrode welding machine |
| CN105149748B (en) * | 2015-10-14 | 2017-08-25 | 刘昇澔 | A kind of alternating current-direct current consumable electrode welding machine |
| CN108672892A (en) * | 2018-05-31 | 2018-10-19 | 张胜男 | A kind of novel TIG weldering external promotion arc strike control devices |
| CN110605459A (en) * | 2018-06-15 | 2019-12-24 | 株式会社达谊恒 | Welding power supply device |
| CN110605459B (en) * | 2018-06-15 | 2022-08-02 | 株式会社达谊恒 | Welding power supply device |
| CN113210802A (en) * | 2021-04-14 | 2021-08-06 | 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101683700B (en) | 2014-12-31 |
| JP2010075944A (en) | 2010-04-08 |
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Granted publication date: 20141231 Termination date: 20160915 |