CN205414667U - Reduce control system that CO2 gas shielded arc welding splashes - Google Patents
Reduce control system that CO2 gas shielded arc welding splashes Download PDFInfo
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- CN205414667U CN205414667U CN201620225078.8U CN201620225078U CN205414667U CN 205414667 U CN205414667 U CN 205414667U CN 201620225078 U CN201620225078 U CN 201620225078U CN 205414667 U CN205414667 U CN 205414667U
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Abstract
The utility model discloses a reduce control system that CO2 gas shielded arc welding splashes constitutes two closed -loop control by voltage control ring sum current control ring, and the outer loop is current control and encircles for voltage control ring, inner ring, the voltage signal of electric arc load is gathered including arc voltage sampling circuit, voltage comparater, voltage regulator and waveform controller, arc voltage sampling circuit to the voltage control ring, the current control ring is including current sampling circuit, current comparator, electric flow regulator and PWM unit. Voltage control ring sum current control ring and waveform controller cooperation can reach comparatively sharp current waveform control, improve the welding automation level, and effectively reduce among the welding process molten drop repulsive interaction and the short circuit process arouses splashes, and improvement welding quality can produce in welding automation by effective use.
Description
Technical field
The present invention relates to source of welding current technical field, be specifically related to source of welding current Control System Design, the splashing being mainly used in inverter type welder controls.
Background technology
CO2Inverter type welder has the advantages such as strong adaptability, light quality, welding efficiency height and response are rapid and is widely used, and especially at carbon steel and low alloy steel welding field, applies the most prominent.But during actual welding, often cause molten drop to splash, cause that appearance of weld is poor, welding quality declines.Splashing Producing reason, discharge-induced explosion theory is considered at CO2In gas shield arc welding short-circuiting, owing to short circuit current forms electromagnetic force, causing liquid bridge to compress, energy accumulation, temperature rises, and makes metal evaporation in liquid bridge, is formed and splashes.By certain control strategy, reduce the splashing that in welding process, molten drop repulsive interaction and short-circuit process cause, improve welding quality, there is important practical significance.In view of this, this patent proposes one and reduces CO2Gas shielded arc welding splash control method, give concrete control strategy, the method can effective less short circuit transition produce splashing amount, improve welding quality, can be efficiently applied to Automation of Welding produce.
Utility model content
The technical problem to be solved is to provide the control system that a kind of new reduction CO2 gas shielded arc welding splashes.
For achieving the above object, the present invention be have employed following technical scheme: a kind of reduces the control system that CO2 gas shielded arc welding splashes, voltage control loop and current regulator constitute double-closed-loop control, and outer shroud is voltage control loop, and internal ring is current regulator；
Described voltage control loop includes arc voltage sample circuit, voltage comparator, voltage regulator and waveshape monitor, described arc voltage sample circuit gathers the voltage signal of arc load, voltage Setting signal and virtual voltage feedback signal are compared by described voltage comparator, deviation signal is sent into voltage regulator, and the output of actuator is sent in waveshape monitor；
Described current regulator includes current sampling circuit, current comparator, rheonome and PWM unit, the current signal of described current sampling circuit collection load, the current signal of the output of waveshape monitor and the actual current signal of sampling are compared by described current comparator, deviation signal sends into rheonome, the signal produced sends into PWM unit, produce and drive signal, control welding machine electric power main circuit switch pipe break-make.
Preferably, in the control system that described reduction CO2 gas shielded arc welding splashes, described current sampling circuit uses Hall element to constitute sample circuit, and the output of Hall element is connected to instrumentation amplifier, as difference-mode input end and the common mode input of amplifier；The input pin 1 of described Hall element connects+5V power supply, and connects the shunt capacitance of 10 μ F extremely, and pin 2 receives the pin 1 of described Hall element, and also connects the shunt capacitance of 10 μ F to ground, pin 3 ground connection；
The pin 1 of described Hall element, pin 3 are for controlling input, and pin 2, pin 4 are Hall voltage outfan；
Amplification is adjusted by the potentiometer of 1 10k Ω of bridging and the resistance of 1 75 Ω between the pin 1 of described amplifier, pin 8；
The pin 3 of described amplifier, pin 2 connect the pin 2,4 of Hall element, the magnitude of voltage after pin 6 output amplification respectively, connect feedback coil；Pin 5 connects the pin 3 of Hall element.
Preferably, in the control system that described reduction CO2 gas shielded arc welding splashes, the amplifier of described current sampling circuit uses AD620.
Preferably, in the control system that described reduction CO2 gas shielded arc welding splashes, described current sampling circuit employing voltage reference chip REF3012 is as the reference voltage source of Hall element HW300B, thus ensures accuracy of detection.
Preferably, in the control system that described reduction CO2 gas shielded arc welding splashes, described arc voltage sample circuit is made up of precision linear optocoupler TIL300/A and bipolarity amplifier TLE2141, by change W1 be disposed to improve the accuracy of identification to arc voltage.
Provide the benefit that relative to prior art, use such scheme, the current regulator of the present invention can ensure that the dynamic characteristic of the source of welding current, in short circuit transition, can control the rate of change of short circuit current, reduce welding process to splash, can effectively control arcing current sudden change simultaneously, control appearance of weld, voltage control loop and current regulator coordinate with waveshape monitor, the waveform that can reach the finest controls, and improves Automation of Welding level.
Accompanying drawing explanation
Fig. 1 is the control principle drawing of the present invention；
Fig. 2 is welding current sample circuit；
Fig. 3 is arc voltage sample circuit figure；
Fig. 4 is segmented waveform control principle drawing.
Detailed description of the invention
In order to make to be engaged in CO2Gas shielded arc welding controls technical staff and is better understood when the present invention program, is described in detail embodiment of the present invention with reference to the accompanying drawings.A kind of control system reducing the splashing of CO2 gas shielded arc welding, is constituted double-closed-loop control by voltage control loop and current regulator, and outer shroud is voltage control loop, and internal ring is current regulator；
Described voltage control loop includes arc voltage sample circuit, voltage comparator, voltage regulator and waveshape monitor, described arc voltage sample circuit gathers the voltage signal of arc load, voltage Setting signal and virtual voltage feedback signal are compared by described voltage comparator, deviation signal is sent into voltage regulator, and the output of actuator is sent in waveshape monitor；
Described current regulator includes current sampling circuit, current comparator, rheonome and PWM unit, the current signal of described current sampling circuit collection load, the current signal of the output of waveshape monitor and the actual current signal of sampling are compared by described current comparator, deviation signal sends into rheonome, the signal produced sends into PWM unit, produce and drive signal, control welding machine electric power main circuit switch pipe break-make.
Preferably, described current sampling circuit uses Hall element to constitute sample circuit, and the output of Hall element is connected to instrumentation amplifier, as difference-mode input end and the common mode input of amplifier；The gain of described amplifier can be changed by regulation potentiometer between pin 1, pin 8；The input pin 1 of described Hall element connects+5V power supply, and connects the shunt capacitance of 10 μ F extremely, and power supply is filtered by this shunt capacitance, improves power supply stability；Pin 2 receives the pin 1 of described Hall element, and also connects the shunt capacitance of 10 μ F to ground, pin 3 ground connection；
The pin 1 of described Hall element, pin 3 are for controlling input, and pin 2, pin 4 are Hall voltage outfan；
Amplification is adjusted by the potentiometer of 1 10k Ω of bridging and the resistance of 1 75 Ω between the pin 1 of described amplifier, pin 8；To change amplification, the pin 7,4 of scalable potentiometer AD620 connects the running voltage of+5V ,-5V respectively, and connects the shunt capacitance of 0.01 μ F respectively extremely, is used for filtering alternating component；
The pin 3 of described amplifier, pin 2 connect the pin 2,4 of Hall element, the magnitude of voltage after pin 6 output amplification respectively, connect feedback coil；Pin 5 connects the pin 3 of Hall element.Preferably, the amplifier of described current sampling circuit uses AD620.Preferably, described current sampling circuit employing voltage reference chip REF3012 is as the reference voltage source of Hall element HW300B, thus ensures accuracy of detection.
Preferably, described arc voltage sample circuit is made up of precision linear optocoupler TIL300/A and bipolarity amplifier TLE2141, by change W1 be disposed to improve accuracy of identification to arc voltage.
See Fig. 1, present system provides CO2Gas shielded arc welding power supply control principle drawing.This circuit is intended to concrete control strategy is described.Control system is constituted double-closed-loop control by Voltage loop and electric current loop, and outer shroud is voltage control loop, and voltage Setting signal and virtual voltage feedback signal compare, and deviation signal is sent into voltage regulator, and the output of actuator is sent in waveshape monitor.Internal ring is current regulator, and the output of waveshape monitor and the actual current signal of sampling compare, and deviation signal sends into rheonome, and the signal of generation sends into PWM unit, produces and drives signal, controls welding machine electric power main circuit switch pipe break-make.In two loops, Voltage loop is mainly used to ensure that weldingvoltage is stable, and to welding process being disturbed signal effectively suppress.Electric current loop is mainly used to ensure the dynamic characteristic of the source of welding current, in short circuit transition, can control the rate of change of short circuit current, reduces welding process and splashes；During arcing, can effectively control arcing current sudden change, control appearance of weld.Voltage loop and electric current loop cooperate with waveshape monitor, and the waveform that can reach the finest controls, and improves Automation of Welding level.
See Fig. 2, give welding current sample circuit.System uses Hall element to constitute sample circuit.With voltage fiducial chip REF3012 as the reference voltage source of Hall element HW300B, thus ensure accuracy of detection.The output of Hall element is connected to instrumentation amplifier AD620, as difference-mode input end and the common mode input of amplifier.The gain of amplifier can be changed by the potentiometer between regulation 1,8 pins.The input pin 1 of REF3012 connects+5V power supply, and connects the shunt capacitance of 10 μ F extremely, and power supply is filtered by this shunt capacitance, improves power supply stability.Pin 2 receives the pin 1 of HW300B, and also connects the shunt capacitance of 10 μ F to ground, pin 3 ground connection.Hall element uses HW300B, input to use voltage mode to power, and pin 1,3 is for controlling input, and pin 2,4 is Hall voltage outfan.Using AD620 amplifier, it changes amplification by changing resistance, and the 1 of AD620, adjust amplification by the potentiometer of 1 10k Ω of bridging and the resistance of 1 75 Ω between 8 pins.To change amplification, the pin 7,4 of scalable potentiometer AD620 connects the running voltage of+5V ,-5V respectively, and connects the shunt capacitance of 0.01 μ F respectively extremely, is used for filtering alternating component；Pin 3,2 connects the pin 2,4 of Hall element, the magnitude of voltage after pin 6 output amplification respectively, connects feedback coil；Pin 5 is basis reference, connects the pin 3 of REF3012, and the ground as whole system connects.
See Fig. 3, give arc voltage sample circuit.This circuit is made up of precision linear optocoupler TIL300/A and bipolarity amplifier TLE2141.By change W1 be disposed to improve accuracy of identification to arc voltage.
See Fig. 4, give segmented waveform control strategy figure.Judging whether system is in short-circuit condition according to arc voltage, if being in short-circuit condition, controlling by selecting switch to access short-circuit process waveform；If being in arcing process, selecting switch to access arcing process waveform and controlling.There is direct relation owing to arc voltage and electric current form splashing amount with soldered material, the demarcation voltage value of short-circuit condition and arcing state, the standard judged as two stages according to this can be drawn by test.Compound state can also be used as the criterion of two processes, but selector must be improved.
System can use welding waveform precise controlling strategy, and its specific practice is by many experiments, short circuit current, voltage and arcing current corresponding when finding welding quality more satisfactory, magnitude of voltage, forms voltage, current data storehouse.In conjunction with data base's Heuristics, short-circuit process and arcing process are segmented further, reach the purpose of precise controlling.Certainly, data base can expand according to welding material difference, when specifically applying, in conjunction with data base's knowledge that welding material application is corresponding, produces short-circuit process and the micro-stepping control strategy of arcing process, improves welding quality.
Above content is to combine the detailed description that the present invention is done by optimal technical scheme, it is impossible to what identification was invented is embodied as being only limitted to these, for the simple deduction made under without departing from inventive concept premise and replacement, all should be considered as protection scope of the present invention.
Claims (5)
1. one kind is reduced the control system that CO2 gas shielded arc welding splashes, it is characterised in that: being constituted double-closed-loop control by voltage control loop and current regulator, outer shroud is voltage control loop, and internal ring is current regulator；
Described voltage control loop includes arc voltage sample circuit, voltage comparator, voltage regulator and waveshape monitor, described arc voltage sample circuit gathers the voltage signal of arc load, voltage Setting signal and virtual voltage feedback signal are compared by described voltage comparator, deviation signal is sent into voltage regulator, and the output of actuator is sent in waveshape monitor；
Described current regulator includes current sampling circuit, current comparator, rheonome and PWM unit, the current signal of described current sampling circuit collection load, the current signal of the output of waveshape monitor and the actual current signal of sampling are compared by described current comparator, deviation signal sends into rheonome, the signal produced sends into PWM unit, produce and drive signal, control welding machine electric power main circuit switch pipe break-make.
The control system that reduction CO2 gas shielded arc welding the most according to claim 1 splashes; it is characterized in that; described current sampling circuit uses Hall element to constitute sample circuit, and the output of Hall element is connected to instrumentation amplifier, as difference-mode input end and the common mode input of amplifier；The input pin 1 of described Hall element connects+5V power supply, and connects the shunt capacitance of 10 μ F extremely, and pin 2 receives the pin 1 of described Hall element, and also connects the shunt capacitance of 10 μ F to ground, pin 3 ground connection；
The pin 1 of described Hall element, pin 3 are for controlling input, and pin 2, pin 4 are Hall voltage outfan；
Amplification is adjusted by the potentiometer of 1 10k Ω of bridging and the resistance of 1 75 Ω between the pin 1 of described amplifier, pin 8；
The pin 3 of described amplifier, pin 2 connect the pin 2,4 of Hall element, the magnitude of voltage after pin 6 output amplification respectively, connect feedback coil；Pin 5 connects the pin 3 of Hall element.
The control system that reduction CO2 gas shielded arc welding the most according to claim 2 splashes, it is characterised in that the amplifier of described current sampling circuit uses AD620.
The control system that reduction CO2 gas shielded arc welding the most according to claim 2 splashes, it is characterised in that described current sampling circuit employing voltage reference chip REF3012 is as the reference voltage source of Hall element HW300B, thus ensures accuracy of detection.
The control system that reduction CO2 gas shielded arc welding the most according to claim 2 splashes; it is characterized in that; described arc voltage sample circuit is made up of precision linear optocoupler TIL300/A and bipolarity amplifier TLE2141, by change W1 be disposed to improve accuracy of identification to arc voltage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620225078.8U CN205414667U (en) | 2016-03-23 | 2016-03-23 | Reduce control system that CO2 gas shielded arc welding splashes |
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| CN201620225078.8U CN205414667U (en) | 2016-03-23 | 2016-03-23 | Reduce control system that CO2 gas shielded arc welding splashes |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108453346A (en) * | 2018-04-13 | 2018-08-28 | 昆明理工大学 | A kind of intellectual infrared temperature welding machine |
| CN108941842A (en) * | 2018-08-10 | 2018-12-07 | 信联网（深圳）五金技术有限公司 | A kind of Manual electric welding machine of monitoring short circuit liquid bridge variation |
| CN110026657A (en) * | 2019-04-26 | 2019-07-19 | 吴忠市黄河电焊机有限公司 | A kind of multi-functional inverted gas protective welder with unified adjusting |
| CN111001901A (en) * | 2020-03-09 | 2020-04-14 | 杭州凯尔达电焊机有限公司 | Short-circuit type AC welding control circuit and welding power supply |
| CN111531253A (en) * | 2020-05-11 | 2020-08-14 | 上海沪工焊接集团股份有限公司 | Gas shielded welding control circuit and gas shielded welding machine |
-
2016
- 2016-03-23 CN CN201620225078.8U patent/CN205414667U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108453346A (en) * | 2018-04-13 | 2018-08-28 | 昆明理工大学 | A kind of intellectual infrared temperature welding machine |
| CN108941842A (en) * | 2018-08-10 | 2018-12-07 | 信联网（深圳）五金技术有限公司 | A kind of Manual electric welding machine of monitoring short circuit liquid bridge variation |
| CN110026657A (en) * | 2019-04-26 | 2019-07-19 | 吴忠市黄河电焊机有限公司 | A kind of multi-functional inverted gas protective welder with unified adjusting |
| CN111001901A (en) * | 2020-03-09 | 2020-04-14 | 杭州凯尔达电焊机有限公司 | Short-circuit type AC welding control circuit and welding power supply |
| CN111531253A (en) * | 2020-05-11 | 2020-08-14 | 上海沪工焊接集团股份有限公司 | Gas shielded welding control circuit and gas shielded welding machine |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160803 Termination date: 20170323 |
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| CF01 | Termination of patent right due to non-payment of annual fee |