CN101683700B - Ac electric arc welding machine - Google Patents
Ac electric arc welding machine Download PDFInfo
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- CN101683700B CN101683700B CN200910171200.2A CN200910171200A CN101683700B CN 101683700 B CN101683700 B CN 101683700B CN 200910171200 A CN200910171200 A CN 200910171200A CN 101683700 B CN101683700 B CN 101683700B
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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 switching element 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, striking when welding wire contacts with soldered thing and carries out striking (arc start) improves.
Background technology
Ac arc welder, makes reactor (reactor) be in saturation state when striking, reduce inductance value, carry out the improvement of striking.
Fig. 4 is the electrical connection graph of the ac arc welder of prior art.
Band shown in Fig. 4 assists winding saturable reactor DWL 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 be made up of constant-current source CC and accessory power supply switch element TR3.Being energized from constant-current source CC is with auxiliary winding saturable reactor DWL to be in the auxiliary winding current Ic of saturation state.
Assist in the main winding Nm of winding saturable reactor DWL the welding current that is energized at the band shown in Fig. 4, auxiliary winding Nc is energized and assists winding current.And ratio of winding Nm: Nc is such as about 1: 1 ~ 1: 5.
Next, work is described.
When welding commencing signal Ts shown in Fig. 4 is transfused to, start welding wire initially to give giving of speed.Meanwhile, accessory power supply switch element TR3 conducting, be energized from accessory power supply PC to auxiliary winding Nc auxiliary winding current Ic.This current value is IcNc > ItNm, for being in the value of saturation state with auxiliary winding saturable reactor.
When welding wire WW shown in Fig. 4 contacts with soldered thing M, weldingvoltage Vd changes from non-load voltage to short-circuit voltage (roughly no-voltage).The now corresponding main control circuit SCP of accessory power supply, weldingvoltage Vd become roughly no-voltage time, be judged as that welding wire WW contacts with soldered thing M, stop the energising of assisting winding current Ic.Now, the auxiliary winding saturable reactor DWL of band, be in saturation state due to the energising by auxiliary winding current Ic, therefore inductance value diminishes, and the climbing of initial current becomes very large.Its result, electric arc easily produces, to alternating current arc welding transition.
As mentioned above, be used in except main winding Nm also pays the saturable reactor having added auxiliary winding Nc in reactor, the initial property of improvement electric arc.(such as the consumable electrode arc welding power source of patent document 1)
[patent document 1] TOHKEMY 2006-43764 publication
Existing ac arc welder shown in Fig. 4, in order to improve striking, main winding except reactor is also paid and is added auxiliary winding and be used as saturable reactor, the accessory power supply PC be made up of constant-current source CC and accessory power supply switch element TR3 is set, be in the auxiliary winding current Ic of saturation state from the auxiliary winding of constant-current source CC energising reactor when striking, making reactor saturated and carrying out striking under the state reducing inductance value, seek the improvement of striking.
But in the above-mentioned methods, the structure of reactor becomes complicated, and needs auxiliary power circuit, thus stops prices.
Summary of the invention
At this, the object of the invention is to, a kind of ac arc welder not needing the reactor with labyrinth is provided.
In order to solve above-mentioned problem, the technical characteristic of the ac arc welder of the technical program is to possess: DC power supply circuit, and it carries out rectification to commercial ac power source, exports DC voltage; Inverter circuit, above-mentioned DC voltage conversion is high-frequency ac voltage by it; Main transformer, the output transform of above-mentioned inverter circuit is the high-frequency ac voltage being suitable for electric arc processes by it; Secondary rectification circuit, it carries out rectification to the output of above-mentioned main transformer; Reactor, it is smoothing to the above-mentioned output be rectified; Polarity switching circuit, it is by being that electrode straight polarity and Electrode Negative are supplied to the 1st switch element of arc load and the 2nd switch element is formed by the output switching of above-mentioned reactor; Polarity switch driving circuit, above-mentioned 1st switch element of its conducting and above-mentioned 2nd switch element; Welding wire gives motor, and welding wire is given to soldered thing by it; Feed motor drive circuit, it drives welding wire to give motor; Main control circuit, it is when welding commencing signal input, control above-mentioned feed motor drive circuit, above-mentioned 1st switch element of conducting and above-mentioned 2nd switch element are until above-mentioned welding wire contacts with above-mentioned soldered thing simultaneously, control above-mentioned polarity switch driving circuit to make to be energized saturation current in above-mentioned reactor, next, when above-mentioned welding wire contacts with above-mentioned soldered thing, above-mentioned polarity switch driving circuit is controlled to make above-mentioned 1st switch element and above-mentioned 2nd switch element alternately conducting.
2nd technical scheme, ac arc welder according to the 1st technical scheme, it is characterized in that, between above-mentioned reactor and above-mentioned 2nd switch element, saturation current testing circuit is set, above-mentioned main control circuit, current constant control is carried out to the saturation current of above-mentioned reactor, until above-mentioned welding wire starts to give and contacts with above-mentioned soldered thing according to the value of the saturation current detection signal detected by above-mentioned saturation current testing circuit.
In ac arc welder of the present invention, control polarity switch driving circuit, simultaneously conducting the 1st switch element and the 2nd switch element when welding and starting, be energized saturation current and make reactor saturated in reactor.Next, when welding wire contacts with soldered thing, control polarity switch driving circuit, a side in conducting the 1st switch element or above-mentioned 2nd switch element and when carrying out striking, in order to carry out striking under the state that the inductance value of reactor is little, initial current sharply increases, and improves striking.
And then the accessory power supply adding the saturable reactor of auxiliary winding, constant-current source owing to not needing the main winding except reactor also to pay and be made up of accessory power supply switch element, therefore, it is possible to realize the miniaturization of goods and the reduction of price.
In the 2nd technical scheme, by carrying out current constant control with the value of regulation to saturation current, thus reactor can be made to be in the high saturation state of precision, seeking the further improvement of striking.
Accompanying drawing explanation
Fig. 1 is the electrical connection graph of the ac arc welder that embodiments of the present invention 1 are relevant.
Fig. 2 is the waveform timing chart of the work for illustration of embodiment 1.
Fig. 3 is the electrical connection graph of the ac arc welder that embodiment 2 is relevant.
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 switches drive singal
C1 smmothing capacitor
D1 the 1st diode
D2 the 2nd diode
D3 the 3rd diode
D4 the 4th diode
DR1 No. 1 rectification circuit
DR2 secondary rectification circuit
DL reactor
IK inverter driving circuit
Ik inverter drive signal
ID output current detection circuit
Id output electric current measure signal
ID2 the 2nd output current detection circuit
Id the 2nd output electric current measure signal
IR output current initialization circuit
INV inverter circuit
INT main transformer
M machined object
MD feed motor drive circuit
Md gives motor drive signal
SC main control circuit
Sc exports control signal
SCK polarity switches corresponding main control circuit
TH welding torch (torch)
TR1 the 1st switch element
TR2 the 2nd switch element
Tr1 the 1st switch element drive singal
Tr2 the 2nd switch element drive singal
VD output voltage detecting circuit
VM welding wire gives motor
Vm welding wire gives signal
VR output voltage initialization circuit
WW electrode (welding wire)
Detailed description of the invention
Fig. 1 is the electrical connection graph of the ac arc welder that embodiments of the present invention 1 are relevant.
In the figure, DC power supply circuit is formed by No. 1 rectification circuit DR1 and smmothing capacitor C4, carries out rectification and level and smooth and export DC voltage to commercial ac power source.
Inverter circuit INV, forming full-bridge circuit (full bridge) by illustrated four the opposite switch elements of omission, is that high-frequency ac voltage exports by DC voltage conversion.
Main transformer INT, the high-frequency ac voltage converted by inverter circuit INV is transformed to the high-frequency ac voltage being suitable for electric arc processes, at the outlet side of main transformer INT, three terminals are set, using intermediate terminal as zero output, the terminal of one side is as positive output, the terminal of the opposing party, as negative output, exports high-frequency ac voltage.Secondary rectification circuit is formed by the 1st diode D1 ~ the 4th diode D4, inputs above-mentioned positive output and above-mentioned negative output, carries out rectification and generate positive voltage and negative voltage.
Polarity switching circuit, half-bridge circuit (Ha-Off Block リ Star ジ) is formed by the 1st switch element TR1 and the 2nd switch element TR2,1st switch element TR1 is switched to electrode straight polarity and by the positive voltage electric power supply arc load from secondary rectification circuit, the 2nd switch element TR2 is switched to Electrode Negative and negative voltage electric power is supplied arc load.
Main control circuit SC is according to welding commencing signal Ts, relatively come to carry out PWM to the pulse width of main control signal Sc and control based on the value of the output electric current measure signal Id detected by output current detection circuit ID and the output current setting value Ir of regulation that set by output current initialization circuit IR, and export the polarity driven signal Ck that polarity switch driving circuit CK is controlled.
In addition, main control circuit SC, based on the value of the voltage sense signal Vd detected by output voltage detecting circuit VD and the comparison of output voltage setting value Vr of regulation that set by output voltage initialization circuit VR, exports the welding wire that the rotation number of giving motor VM to welding wire controls and gives signal Vm.Welding wire is given signal Vm and is transformed to and gives motor drive signal Md and give motor VM to drive welding wire by feed motor drive circuit MD.
Polarity switch driving circuit CK, exports the 1st switch element drive singal Tr1 and the 2nd switch element drive singal Tr2 that drive the 1st switch element TR1 and the 2nd switch element TR2 according to polarity driven signal Ck.
Fig. 2 is the waveform timing chart of the work for illustration of embodiments of the present invention 1.
In Fig. 2, the waveform of this figure (A) represents welding commencing signal Ts, the waveform of this figure (B) represents voltage sense signal Vd, the waveform of this figure (C) represents output electric current measure signal Id, the waveform of this figure (D) represents the 1st switch element drive singal Tr1, the waveform of this figure (E) represents the 2nd switch element drive singal Tr2, the waveform of this figure (F) represents that welding wire gives signal Vm, and the waveform of this figure (G) represents the long Lw of electric arc.
Next, the work of waveform timing chart to embodiments of the present invention 1 of Fig. 2 is adopted to be 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 controls polarity switch driving circuit CK, the 1st switch element drive singal Tr1 shown in this figure (D) and the 2nd switch element drive singal Tr2 is exported simultaneously, and exports the initial welding wire shown in this figure (F) and give signal Vm.
At moment t=t1, the 1st switch element TR1 shown in Fig. 1 and the 2nd switch element TR2 conducting simultaneously, reactor DL is energized saturation current (such as 100A), and welding wire is given motor VM gives signal Vm value Vmi based on initial welding wire and started 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, be energized in reactor DL saturation current, is in saturation state and the value Vmi that the motor VM of feed apparatus gives signal Vm based on initial welding wire continues the giving of welding wire WW.
At moment t=t2, main control circuit SC, when the value of the voltage sense signal Vd detected by output voltage detecting circuit VD is roughly zero, be judged as that welding wire WW contacts with soldered thing M, stop the output of the 2nd switch element drive singal Tr2 shown in Fig. 2 (E), cut off the 2nd switch element TR2.
At moment t=t2, when welding wire WW contacts with soldered thing M, start 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 contacts with soldered thing M, main control circuit SC control inverter circuit I NV controls initial current Is.Now, reactor DL is in saturation state due to energising saturation current, and therefore the climbing of initial current Is becomes very high, and electric arc easily produces.
At moment t=t3, electric arc produces, and the base Quasi magnitude of voltage Vrf that the value Vp of voltage sense signal Vd becomes than omitting illustrated regulation is large, and main control circuit SC is judged as that electric arc produces, starts initial current Is.Such as be transitioned into the stable electric current I p of electrode straight polarity, from little electric arc to common arc transfer.
At moment t=t3, when the little electric arc shown in Fig. 2 produces, the value Vmi giving signal Vm from initial welding wire changes to stable value Vmu.
At moment t=t4, the 1st switch element TR1 cuts off, and the 2nd switch element TR2 conducting, switch from electrode straight polarity to Electrode Negative, be transitioned into the stable electric current I n of Electrode Negative.Further, switch the polarity of electrode with the stable cycle later, continue the generation of alternating current arc.
According to above-mentioned, polarity switch driving circuit CK conducting the 1st switch element TR1 and the 2nd switch element TR2 simultaneously when welding beginning, make it saturated to reactor energising saturation current, next when welding wire WW contacts with soldered thing M, such as cut off the 2nd switch element TR2, when conducting the 1st switch element TR1 carries out striking, in order to carry out striking under the state that the inductance value of reactor is little, initial current sharply increases, and striking becomes good.In addition, in above-mentioned, to cut off the 2nd switch element TR2, the electrode straight polarity of conducting the 1st switch element TR1 carries out striking, but also can cut off the 1st switch element TR1 conversely, the Electrode Negative of conducting the 2nd switch element TR2 carries out striking.
Fig. 3 is the electrical connection graph of the ac arc welder that embodiment 2 is relevant, in the figure, carry out same action with the construct of the electrical connection graph same-sign of the ac arc welder shown in Fig. 1, therefore omit the description, only the construct different to symbol is described.
Moment t=t1 shown in Fig. 2, the 1st switch element TR1 shown in Fig. 1 and the 2nd switch element TR2 conducting simultaneously, reactor DL is energized saturation current (such as 100A), and welding wire is given motor VM gives signal Vm value Vmi based on initial welding wire and started to give welding wire WW to soldered thing M.
Saturation current testing circuit ID2 shown in Fig. 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.
Moment t=t1 ~ t2 shown in Fig. 2, main control circuit SC, based on by the value omitting the saturation current setting value of the regulation that illustrated saturation current initialization circuit sets and the saturation current detection signal Id2 by saturation current testing circuit ID2 detection, current constant control is carried out to the saturation current be energized in reactor DL.
Moment t=t2 shown in Fig. 2, main control circuit SC, when the value of the voltage sense signal Vd detected by output voltage detecting circuit VD is roughly zero, be judged as that welding wire contacts with soldered thing, terminate the current constant control of the saturation current be energized in reactor DL, and stop the output of the 2nd switch element drive singal Tr2 shown in Fig. 2 (E), cut off the 2nd switch element TR2.
At moment t=t2, when welding wire WW contacts with soldered thing M, start 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, therefore omit the description.
Claims (1)
1. an ac arc welder, is characterized in that, possesses:
DC power supply circuit, it carries out rectification to commercial ac power source, exports DC voltage;
Inverter circuit, above-mentioned DC voltage conversion is high-frequency ac voltage by it;
Main transformer, the output transform of above-mentioned inverter circuit is the high-frequency ac voltage being suitable for electric arc processes by it;
Secondary rectification circuit, it is formed to the 4th diode by the 1st diode, and input positive output and negative output, carry out rectification to the output of above-mentioned main transformer and generate positive voltage and negative voltage;
Reactor, it is smoothing to the above-mentioned output be rectified;
Polarity switching circuit, it is by being that electrode straight polarity and Electrode Negative are supplied to the 1st switch element of arc load and the 2nd switch element is formed by the output switching of above-mentioned reactor;
Polarity switch driving circuit, above-mentioned 1st switch element of its conducting and above-mentioned 2nd switch element;
Welding wire gives motor, and welding wire is given to soldered thing by it;
Feed motor drive circuit, it drives welding wire to give motor; With
Main control circuit, it is when welding commencing signal input, control above-mentioned feed motor drive circuit, above-mentioned 1st switch element of conducting and above-mentioned 2nd switch element are until above-mentioned welding wire contacts with above-mentioned soldered thing simultaneously, control above-mentioned polarity switch driving circuit to make to be energized saturation current in above-mentioned reactor, next when above-mentioned welding wire contacts with above-mentioned soldered thing, control above-mentioned polarity switch driving circuit to make above-mentioned 1st switch element and above-mentioned 2nd switch element alternately conducting
Above-mentioned main control circuit is based on the value of the voltage sense signal detected by output voltage detecting circuit and the comparison of the output voltage setting value of regulation that set by output voltage initialization circuit, the welding wire that the rotation number that output gives motor to above-mentioned welding wire controls gives signal
Between above-mentioned reactor and above-mentioned 2nd switch element, saturation current testing circuit is set,
Above-mentioned main control circuit, according to the saturation current setting value of the regulation set by saturation current initialization circuit and the value of saturation current detection signal that detected by above-mentioned saturation current testing circuit, current constant control is carried out to the saturation current of above-mentioned reactor, until above-mentioned welding wire starts to give and contacts with above-mentioned soldered thing, if the value vanishing of the voltage sense signal detected by output voltage detecting circuit, terminates above-mentioned current constant control, stop the output of the 2nd switch element drive singal and cut off above-mentioned 2nd switch element.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008245463 | 2008-09-25 | ||
| JP2008245463A JP2010075944A (en) | 2008-09-25 | 2008-09-25 | Ac arc welding machine |
| JP2008-245463 | 2008-09-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101683700A CN101683700A (en) | 2010-03-31 |
| CN101683700B true CN101683700B (en) | 2014-12-31 |
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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 |
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| Country | Link |
|---|---|
| JP (1) | JP2010075944A (en) |
| CN (1) | CN101683700B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5429362B2 (en) * | 2010-09-01 | 2014-02-26 | パナソニック株式会社 | AC TIG welding method |
| JP6444271B2 (en) * | 2015-06-25 | 2018-12-26 | 株式会社三社電機製作所 | AC output inverter 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 |
| JP7106799B2 (en) * | 2018-06-15 | 2022-07-27 | 株式会社ダイヘン | welding power supply |
| 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 (4)
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|---|---|---|---|---|
| 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 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN1319694C (en) * | 2005-01-13 | 2007-06-06 | 上海交通大学 | Full-digital speed change control method for wire feeding for submerged arc welding |
-
2008
- 2008-09-25 JP JP2008245463A patent/JP2010075944A/en active Pending
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2009
- 2009-09-15 CN CN200910171200.2A patent/CN101683700B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Non-Patent Citations (1)
| Title |
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| JP特开2002-224828A 2002.08.13 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101683700A (en) | 2010-03-31 |
| JP2010075944A (en) | 2010-04-08 |
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