CN103586563B - Variable Polarity Arc Welding Power and control method thereof - Google Patents
Variable Polarity Arc Welding Power and control method thereof Download PDFInfo
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- CN103586563B CN103586563B CN201310421790.6A CN201310421790A CN103586563B CN 103586563 B CN103586563 B CN 103586563B CN 201310421790 A CN201310421790 A CN 201310421790A CN 103586563 B CN103586563 B CN 103586563B
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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
- B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
- B23K9/1006—Power supply
- B23K9/1043—Power supply characterised by the electric circuit
- B23K9/1056—Power supply characterised by the electric circuit by using digital means
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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
- B23K9/095—Monitoring or automatic control of welding parameters
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- Inverter Devices (AREA)
- Generation Of Surge Voltage And Current (AREA)
Abstract
The invention provides Variable Polarity Arc Welding Power and control method thereof, belong to welding technology field.Variable Polarity Arc Welding Power comprises: welding current setup unit, current detecting unit, controller and inverter loop; Welding current setup unit, current detecting unit and inverter loop are electrically connected with controller respectively, and welding current setup unit is for setting desirable welding current, and current detecting unit is for detecting actual welding electric current.Described controller comprises: polarity judging unit, for the actual welding electric current detected according to current detecting unit, judges the polarity in control stage; Control unit, for according to the polarity judged, the desirable welding current of setting and the actual welding electric current of detection, controls inverter loop and exports welding current.The present invention can control the stage according to opposed polarity and adopt different controling parameters to control, and when effectively solving preset parameter, the problem that bipolarity waveform can not be taken into account, realizes the accurate control to Variable Polarity arc-welding.
Description
[technical field]
The present invention relates to welding technology field, particularly relate to a kind of Variable Polarity Arc Welding Power and control method thereof.
[background technology]
Variable Polarity arc-welding, in the middle of the welding procedure being widely used in aluminium, aluminium alloy.Variable Polarity arc-welding comprises ac tungsten inert gases welding (TIG) etc.For Variable Polarity Arc Welding Power, positive half-wave control time add forward voltage to electrode, mother metal is negative, electric current by electrode stream to mother metal; Negative half-wave adds forward voltage to mother metal when controlling, and electrode is negative, and electric current flows to electrode by mother metal.Because Variable Polarity arc welding electrode has larger difference to the discharge capability of mother metal and mother metal to the discharge capability of electrode, when result in variable polarity welding, the positive and negative half-wave of Variable Polarity not easily realizes uniformity and controls, thus the stable arc performance of variable polarity welding cannot be realized, easily cause that welding scaling loss electroplax is serious, welding arc is unstable, appearance of weld is bad, welding exists and splash.
At present, Variable Polarity Arc Welding Power all adopts fixing controling parameters to control, and does not all consider that electrode is different to the discharge capability of electrode from mother metal to the discharge capability of mother metal when controlling, therefore, and the above-mentioned shortcoming of ubiquity.
[summary of the invention]
[technical problem]
The present invention is intended to for the problems of the prior art, provides a kind of Variable Polarity Arc Welding Power and control method thereof.
[solution]
The invention provides a kind of Variable Polarity Arc Welding Power, comprising: welding current setup unit, current detecting unit, controller and inverter loop; Described welding current setup unit, described current detecting unit and described inverter loop are electrically connected with described controller respectively, and described welding current setup unit is for setting desirable welding current, and described current detecting unit is for detecting actual welding electric current.
The feature of Variable Polarity Arc Welding Power of the present invention is: described controller comprises: polarity judging unit, and it, for the actual welding electric current detected according to described current detecting unit, judges the polarity in control stage; Control unit, the actual welding electric current that its desirable welding current for the polarity judged according to described polarity judging unit, the setting of described welding current setup unit and described current detecting unit detect, controls inverter loop and exports welding current.
The present invention also provides a kind of Variable Polarity Arc Welding Power, comprising: welding current setup unit, current detecting unit, controller and inverter loop; Described welding current setup unit, described current detecting unit and described inverter loop are electrically connected with described controller respectively, and described welding current setup unit is for setting desirable welding current, and described current detecting unit is for detecting actual welding electric current.
The feature of Variable Polarity Arc Welding Power of the present invention is: described controller comprises: polarity set unit, and it is for the polarity in setup control stage; Control unit, it, for the actual welding electric current detected according to the polarity of described polarity set unit setting, the desirable welding current of described welding current setup unit setting and described current detecting unit, controls inverter loop and exports welding current.
The invention provides a kind of control method of Variable Polarity Arc Welding Power.Described power supply comprises: welding current setup unit, current detecting unit, controller and inverter loop; Described welding current setup unit, described current detecting unit and described inverter loop are electrically connected with described controller respectively, and described method comprises the steps: to set desirable welding current by described welding current setup unit; The described current detecting unit passed through detects actual welding electric current; By described controller according to the actual welding electric current detected, judge the polarity in control stage; According to judged polarity, set desirable welding current and the actual welding electric current that detects, control described inverter loop by described controller and export welding current.
The present invention also provides a kind of control method of Variable Polarity Arc Welding Power, and described power supply comprises: welding current setup unit, current detecting unit, controller and inverter loop; Described welding current setup unit, described current detecting unit and described inverter loop are electrically connected with described controller respectively, and described method comprises the steps: to set desirable welding current by described welding current setup unit; By the polarity in described controller setup control stage; Actual welding electric current is detected by described current detecting unit; According to set polarity, set desirable welding current and the actual welding electric current that detects, control described inverter loop by described controller and export welding current.
[invention beneficial effect]
The present invention is owing to adopting such scheme, and can control the stage according to opposed polarity and adopt different controling parameters to control, when effectively can solve preset parameter, the problem that bipolarity waveform can not be taken into account, realizes the accurate control to Variable Polarity arc-welding.
[accompanying drawing explanation]
Fig. 1 is the hardware block diagram of the Variable Polarity Arc Welding Power of first embodiment of the invention;
Fig. 2 is the software architecture diagram in controller shown in Fig. 1;
Fig. 3 is the flow chart of the control method of the Variable Polarity Arc Welding Power of first embodiment of the invention;
Fig. 4 is the software architecture diagram of second embodiment of the invention;
Fig. 5 is the flow chart of the control method of the Variable Polarity Arc Welding Power of second embodiment of the invention.
[detailed description of the invention]
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described.
[the first embodiment]
[hardware configuration]
The hardware configuration of the Variable Polarity arc welding control device of first embodiment of the invention is described referring to Fig. 1.
Variable Polarity Arc Welding Power shown in the present embodiment is the TIG source of welding current.
As shown in Figure 1, Variable Polarity Arc Welding Power of the present invention comprises: welding current setup unit, current detecting unit, controller and inverter loop.Described welding current setup unit, described current detecting unit and described inverter loop are electrically connected with described controller respectively.Described welding current setup unit is for setting desirable welding current.Current detecting unit is for detecting welding current, and it can adopt current transformer.Inverter loop is for exporting welding current.Controller is for controlling inverter loop.
Controller comprises: A/D converting unit, DSP processing unit, PWM output unit, PWM driver element.The analog signal (current signal) that A/D converting unit is used for current transformer detects is converted to data signal, and data signal is input to DSP processing unit.DSP processing unit, according to the current signal of input, carrys out the output of control PWM output unit.DSP processing unit comprises CPU, RAM and FLASH(flash memory).CPU is used for carrying out computing and control, and RAM is the odd-job district of CPU, and FLASH is used for storing corresponding program and data etc., such as corresponding with the control method flow process described after a while program module.PWM output unit is used for the control signal according to CPU, exports corresponding PWM waveform.The PWM waveform that PWM output unit exports by PWM driver element amplifies, to drive inverter loop.In the present embodiment, controller is the C2000 of Texas Instrument, and it is integrated with said units.But the present invention is not limited thereto, other chips or unit can be adopted can to adopt separately corresponding hardware circuit.
[software configuration]
Referring to Fig. 2, the software configuration in controller of the present invention is described.
As shown in Figure 2, controller comprises: polarity judging unit and control unit.Polarity judging unit is used for the actual welding electric current detected according to described current detecting unit, judges the polarity in control stage.The desirable welding current that control unit is used for the polarity judged according to described polarity judging unit, described welding current setup unit sets and the actual welding electric current that described current detecting unit detects, control inverter loop and export welding current.The program module corresponding with polarity judging unit and control unit is stored in FLASH, and operationally, corresponding program module is loaded into RAM from FLASH and runs by the CPU in DSP processing unit.
[welding control method]
Following reference Fig. 1-Fig. 3 describes welding control method of the present invention.
As shown in Figure 3, first, in step s 201, set desirable welding current (welding current setup unit) by controller, then, in step S202, detect actual welding electric current by current detecting unit (current transformer).Subsequently, in step S203, controller judges the polarity (polarity judging unit) in control stage according to the actual welding electric current detected.Finally, in step S204, controller, according to the actual welding electric current of the polarity in control stage judged, the desirable welding current of setting and detection, controls inverter loop and exports welding current (control unit).
Specifically, first the CPU in controller according to different polarity and desirable welding current, selects corresponding controling parameters, then determines that PWM opens value according to actual welding electric current.Then, generate corresponding PWM waveform by PWM output unit, after through PWM driver element amplify after, drive inverter loop export welding current.
In the present embodiment, when selecting controling parameters, scale parameter, integral parameter, loop compensation parameter in selecting PI to control and PWM is maximum opens parameter are below four parameters and the corresponding look-up table of polarity and electric current.
Scale parameter
Integral parameter
Loop compensation parameter
PWM is maximum opens parameter
The corresponding controling parameters found in above-mentioned look-up table is input to power source model by controller, thus realizes accurate control.
Although it should be noted that in a first embodiment, employ above-mentioned four parameters, the present invention is not limited thereto, can only usage ratio parameter and integral parameter, control.In addition, controling parameters also can change according to power source model.
[the second embodiment]
The hardware configuration of the second embodiment is identical with the first embodiment, therefore no longer repeated description.
The software configuration of the second embodiment is substantially identical with the first embodiment, and difference is: as shown in Figure 4, and use polarity set unit to replace polarity judging unit, polarity set unit is used for the polarity in setup control stage.Namely in a second embodiment, without the need to judging the polarity in control stage, but by the polarity in controller direct setup control stage.
The control method of the second embodiment is described below in conjunction with Fig. 5.
Second embodiment is also substantially identical with the control method of the first embodiment, therefore in Figure 5 with Fig. 3 something in common of the first embodiment, have employed identical Reference numeral.
As shown in Figure 5, first, in step s 201, desirable welding current (welding current setup unit) is set by controller.Then, in step S303, by the polarity (polarity set unit) in controller setup control stage.Then, in step S202, detect actual welding electric current by current detecting unit (current transformer).Then, in step S204, according to set polarity, set desirable welding current and the actual welding electric current that detects, control inverter loop by controller and export welding current (control unit).
It should be noted that and can be out of shape the second embodiment, such as, in the method shown in Fig. 5, first carry out the process of step S303, then carry out the process of step S201.
[other embodiments]
For MIG welding machine, the hardware configuration similar with above-mentioned first embodiment and control method can be adopted, difference is only: do not use current detecting unit sensed current signal, and use voltage detection unit to detect weldingvoltage signal, and carry out polarity judgement according to weldingvoltage signal, and then realize accurately controlling inverter loop.
Equally, for MIG welding machine, can adopt the hardware configuration similar with above-mentioned second embodiment and control method, difference is only: do not use current detecting unit sensed current signal, and uses voltage detection unit to detect weldingvoltage signal.
Above, with reference to detailed or specific embodiment, describe the present invention, but those skilled in the art understand: various change and correction can be carried out under the prerequisite not departing from spirit of the present invention and scope.
[industrial applicibility]
The present invention adopts different controling parameters to control according to the opposed polarity control stage, and when effectively can solve preset parameter, the problem that bipolarity waveform can not be taken into account, realizes the accurate control to Variable Polarity arc-welding.
Claims (4)
1. a Variable Polarity Arc Welding Power, comprising: welding current setup unit, current detecting unit, controller and inverter loop; Described welding current setup unit, described current detecting unit and described inverter loop are electrically connected with described controller respectively, described welding current setup unit is for setting desirable welding current, described current detecting unit, for detecting actual welding electric current, is characterized in that: described controller comprises:
Polarity judging unit, it, for the actual welding electric current detected according to described current detecting unit, judges the polarity in control stage;
Control unit, the actual welding electric current that its desirable welding current for the polarity judged according to described polarity judging unit, the setting of described welding current setup unit and described current detecting unit detect, controls inverter loop and exports welding current.
2. a Variable Polarity Arc Welding Power, comprising: welding current setup unit, current detecting unit, controller and inverter loop; Described welding current setup unit, described current detecting unit and described inverter loop are electrically connected with described controller respectively, and described welding current setup unit is for setting desirable welding current, and described current detecting unit is for detecting actual welding electric current; It is characterized in that: described controller comprises:
Polarity set unit, it is for the polarity in setup control stage;
Control unit, it, for the actual welding electric current detected according to the polarity of described polarity set unit setting, the desirable welding current of described welding current setup unit setting and described current detecting unit, controls inverter loop and exports welding current.
3. a control method for Variable Polarity Arc Welding Power, described power supply comprises: welding current setup unit, current detecting unit, controller and inverter loop; Described welding current setup unit, described current detecting unit and described inverter loop are electrically connected with described controller respectively, and described method comprises the steps:
Desirable welding current is set by described welding current setup unit;
Actual welding electric current is detected by described current detecting unit;
By described controller according to the actual welding electric current detected, judge the polarity in control stage;
According to judged polarity, set desirable welding current and the actual welding electric current that detects, control described inverter loop by described controller and export welding current.
4. a control method for Variable Polarity Arc Welding Power, described power supply comprises: welding current setup unit, current detecting unit, controller and inverter loop; Described welding current setup unit, described current detecting unit and described inverter loop are electrically connected with described controller respectively, and described method comprises the steps:
Desirable welding current is set by described welding current setup unit;
By the polarity in described controller setup control stage;
Actual welding electric current is detected by described current detecting unit;
According to set polarity, set desirable welding current and the actual welding electric current that detects, control described inverter loop by described controller and export welding current.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310421790.6A CN103586563B (en) | 2013-09-16 | 2013-09-16 | Variable Polarity Arc Welding Power and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310421790.6A CN103586563B (en) | 2013-09-16 | 2013-09-16 | Variable Polarity Arc Welding Power and control method thereof |
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| Publication Number | Publication Date |
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| CN103586563A CN103586563A (en) | 2014-02-19 |
| CN103586563B true CN103586563B (en) | 2016-03-30 |
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| US20180050412A1 (en) * | 2016-08-16 | 2018-02-22 | Illinois Tool Works Inc. | Welding-type power supplies with adjustable ac current commutation thresholds |
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