CN203944974U - A kind of control circuit for short circuiting arc welding - Google Patents
A kind of control circuit for short circuiting arc welding Download PDFInfo
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- CN203944974U CN203944974U CN201420375536.7U CN201420375536U CN203944974U CN 203944974 U CN203944974 U CN 203944974U CN 201420375536 U CN201420375536 U CN 201420375536U CN 203944974 U CN203944974 U CN 203944974U
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Abstract
The utility model discloses a kind of control circuit for short circuiting arc welding, comprising: a welding machine welding output voltage sampling module, for the output voltage of Real-time Collection welding machine; One pulse width modulation drives signaling module, for exporting a pulse width modulation, drives signal threshold value; One comparator U2B, for driving signal threshold value to compare this output voltage and pulse width modulation, controls the break-make of an optocoupler U4 according to comparative result; The output of this optocoupler U4 is connected with the input of a single-chip microcomputer, and this single-chip microcomputer calculates according to the break-make of this optocoupler U4 and regulates this pulse width modulation to drive the output of signal.
Description
Technical field
The utility model relates to a kind of welding equipment technology, relates in particular to a kind of control circuit that is applicable to CO 2 gas-shielded automatic welder(welding machine).
Background technology
Carbon dioxide gas shielded welding machine is to using the melt pole electrical arc soldering method of CO2 as protective gas; during work, at arc, form gas around and protect anti-layer, isolated external oxygen, makes weld seam be unlikely to be oxidized carbonization; thereby raising weldquality, makes to weld plane more attractive in appearance smooth.Carbon dioxide gas shielded welding machine can be used for the high-quality welding of the materials such as carbon steel, low-alloy steel, stainless steel, aluminium and alloy thereof.
Short circuiting arc welding is a kind of application welding procedure very widely, but has the shortcoming such as splash, appearance of weld is poor.Short circuiting transfer refers to welding rod (or welding wire), and the molten drop of end contacts with molten bath short circuit, due to strong overheated and magnetic contraction, makes molten drop quick-fried disconnected. the direct mode of metal transfer to molten bath transition.After arc burning, by electric arc, separate out heat, filler wire, and gather a small amount of droplet metal in welding wire termination.Because welding wire melts and forms arc space rapidly, its length is decided by arc voltage.Subsequently, droplet volume increases gradually, and arc length shortens slightly.Along with molten drop is constantly grown up, the heat that electric arc imports into unfused welding wire direction reduces, and welding wire melting rate also reduces.Because welding wire is still sent to certain speed, so certainly will cause molten drop to move closer to molten bath, arc length shortens.Molten drop and molten bath all in constantly undulatory motion simultaneously, and this has just increased the chance that molten drop contacts with molten bath.When contact, just make arc space short circuit, so arc extinction, arc voltage sharply declines, close to zero, and short circuit current starts to increase, and forms liquid metals post between welding wire and molten bath.The fluid column of this state can not be disrumpent feelings voluntarily.Along with short circuit current exponentially rule constantly increase, its caused electromagnetic contractile force compresses fluid column consumingly, simultaneously, under surface tension effects, fluid column metal is flowed to molten bath, and form necking down, this necking down is called " foot bridge ".This foot bridge is connecting welding wire and molten bath, simultaneously by larger short circuit current, and makes foot bridge blast rapidly due to overheated gasification.At this moment arc voltage returns to floating voltage very soon to foretell, and electric arc ignites again.Constantly repeat subsequently said process.During short circuiting transfer, load variations is larger, so dynamic characteristic is had to very high requirement, has the shortcoming such as splash, appearance of weld is poor.
Utility model content
In order to overcome the shortcoming existing in prior art, the utility model provides a kind of control circuit for short circuiting arc welding, can realize on control waveform basis, in short-circuit stage, adopts explosion-proof disconnected necking down to control.
In order to realize above-mentioned utility model object, the utility model discloses a kind of control circuit for short circuiting arc welding, comprising: a welding machine welding output voltage sampling module, for the output voltage of Real-time Collection welding machine; One pulse width modulation drives signaling module, for exporting a pulse width modulation, drives signal threshold value; One comparator U2B, for driving signal threshold value to compare this output voltage and pulse width modulation, controls the break-make of an optocoupler U4 according to comparative result; The output of this optocoupler U4 is connected with the input of a single-chip microcomputer, and this single-chip microcomputer calculates according to the break-make of this optocoupler U4 and regulates this pulse width modulation to drive the output of signal.
Further, this welding machine welding output voltage sampling module comprises resistance R 2, the R5 being connected with this welding machine welding output voltage, the output parallel resistance R1 of this resistance R 2 and capacitor C 1, input parallel resistance R4, the R3 of this resistance R 1 and and capacitor C 2, the output of this resistance R 3 is connected with the positive input terminal of this comparator.
Further, this pulse width modulation is connected with the input of a comparator U3 after driving signaling module to receive this pulse width modulation driving signal dividing potential drop, the output of this comparator U3 connects an optocoupler U1, the output of this optocoupler U1 is connected with the positive input terminal of a comparator U2A, the output of this optocoupler U1 is connected after a Zener diode ZD1 and is connected with the negative input end of this comparator U2A, and the output of this comparator U2A connects the negative input end of this comparator U2B.
Further, this pulse width modulation drives signal to connect a resistance R 7, the output parallel resistance R8 of this resistance R 7 and capacitor C 5, the output of this resistance R 8 connects the positive input terminal of this comparator U3, and the output of this electric capacity connects successively a potentiometer and a resistance R 12 is rear and the negative input end of this comparator U3.
Further, the output of this comparator U3 resistance R 9 in parallel and capacitor C 7, the output of this resistance R 9 is connected with the input of this optocoupler U1, and a resistance R 13 in parallel, capacitor C 4 and this Zener diode ZD1 are successively stated in the output parallel connection of this optocoupler U1.
Further, the output of this comparator U2A connects the rear capacitor C 6 in parallel of a resistance R 10 and resistance R 11, and the output of this resistance R 11 is connected with the negative input end of this comparator U2B.
Further, the output of this comparator U2B is connected with the input of this optocoupler U4 after connecting a resistance R 15.
Compared with prior art, the control circuit for short circuiting arc welding disclosed in the utility model can be realized on control waveform basis, in short-circuit stage, adopts explosion-proof disconnected necking down to control.The moment that molten drop is contacted with molten bath, reduce levels of current, to reduce the vibration in molten bath and to impel molten drop sprawling at weld pool surface, prevent that molten drop from producing separated with contact position, molten bath, the liquid metal foot bridge that appears at that prevents so-called instantaneous short-circuit phenomenon produces necking down and is about to occur the quick-fried levels of current that again reduces when disconnected, to suppress the quick-fried disconnected generation of electric welding, reduce to splash in arcing process, should impose larger electric current to electric arc, electric arc is fully heated workpiece, promote molten bath to sprawl, guarantee good appearance of weld.
Accompanying drawing explanation
About advantage of the present utility model and spirit, can describe in detail and appended graphic being further understood by following utility model.
Fig. 1 is the structural representation of the related control circuit of the utility model;
Fig. 2 is the detailed circuit diagram of the related control circuit of the utility model.
The specific embodiment
Below in conjunction with accompanying drawing, describe specific embodiment of the utility model in detail.
, there is the shortcoming such as splash, appearance of weld is poor in short circuiting arc welding technique.In short circuit transition, carrying out Waveform Control can address the above problem.Waveform Control refers to the moment that molten drop contacts with molten bath, reduce levels of current, to reduce the vibration in molten bath and to impel molten drop sprawling at weld pool surface, prevent that molten drop from producing separated with contact position, molten bath, the liquid metal foot bridge that appears at that prevents so-called instantaneous short-circuit phenomenon produces necking down and is about to occur the quick-fried levels of current that again reduces when disconnected, to suppress the quick-fried disconnected generation of electric welding, reduce to splash in arcing process, should impose larger electric current to electric arc, electric arc is fully heated workpiece, promote molten bath to sprawl, guarantee good appearance of weld.
The structural representation of control circuit provided by the utility model as shown in Figure 1.The actual current of this control circuit is controlled output currents by 16 single-chip microcomputers 10 and is adjusted pulsewidth with PPG(PWM waveform) form set electric current, now the parameter of the output voltage of sampling 11 and threshold current is crossed to ratio comparator 12 and exported to a self-adaptive controller 13, and the resetting of the threshold current of FEEDBACK CONTROL single-chip microcomputer, guarantee that welding is not splashed and quick-fried disconnected.Different control necking down waveform under different welding conditions: arc stage, realizes arcing waveform adjustment by adjusting controller parameter under different specification condition.
Fig. 2 is the detailed circuit diagram of the related control circuit of the utility model.As shown in Figure 2, welding machine welding output voltage sampling V1, PPG(PWM tune pulsewidth form) for welding machine, maintain the driving signal feeding of constant voltage output energy, drive the threshold value of signal to isolate with the calculating of output voltage energy and compare output by sampled signal by linear optical coupling, control the break-make of optocoupler U4.In Fig. 2, optocoupler output signal meets single-chip microcomputer input CPU, thereby single-chip microcomputer regulates the output of PPG by calculating.
Below with reference to Fig. 2, introduce in detail the detailed circuit diagram of the related control circuit of the utility model.The disclosed control circuit for short circuiting arc welding of the utility model, comprises a welding machine welding output voltage sampling module, for the output voltage of Real-time Collection welding machine; One pulse width modulation drives signaling module, for exporting a pulse width modulation, drives signal threshold value; One comparator U2B, for driving signal threshold value to compare this output voltage and pulse width modulation, controls the break-make of an optocoupler U4 according to comparative result; The output of this optocoupler U4 is connected with the input of a single-chip microcomputer, and this single-chip microcomputer calculates according to the break-make of this optocoupler U4 and regulates this pulse width modulation to drive the output of signal.
Welding machine welding output voltage sampling module comprises resistance R 2, the R5 being connected with this welding machine welding output voltage, the output parallel resistance R1 of this resistance R 2 and capacitor C 1, input parallel resistance R4, the R3 of this resistance R 1 and and capacitor C 2, the output of this resistance R 3 is connected with the positive input terminal of this comparator.
Pulse width modulation is connected with the input of a comparator U3 after driving signaling module to receive this pulse width modulation driving signal dividing potential drop, the output of this comparator U3 connects an optocoupler U1, the output of this optocoupler U1 is connected with the positive input terminal of a comparator U2A, the output of this optocoupler U1 is connected after a Zener diode ZD1 and is connected with the negative input end of this comparator U2A, and the output of this comparator U2A connects the negative input end of this comparator U2B.
Pulse width modulation drives signal to connect a resistance R 7, the output parallel resistance R8 of this resistance R 7 and capacitor C 5, the output of this resistance R 8 connects the positive input terminal of this comparator U3, and the output of this electric capacity connects successively a potentiometer and a resistance R 12 is rear and the negative input end of this comparator U3.
An output resistance R 9 in parallel and the capacitor C 7 of comparator U3, the output of this resistance R 9 is connected with the input of this optocoupler U1, and a resistance R 13 in parallel, capacitor C 4 and this Zener diode ZD1 are successively stated in the output parallel connection of this optocoupler U1.
The output of comparator U2A connects the rear capacitor C 6 in parallel of a resistance R 10 and resistance R 11, and the output of this resistance R 11 is connected with the negative input end of this comparator U2B.
The output of comparator U2B is connected with the input of this optocoupler U4 after connecting a resistance R 15.
Described in this description is preferred embodiment of the present utility model, and above embodiment is only in order to the technical solution of the utility model to be described but not to restriction of the present utility model.All those skilled in the art comply with design of the present utility model by the available technical scheme of logical analysis, reasoning, or a limited experiment, all should be within scope of the present utility model.
Claims (7)
1. for a control circuit for short circuiting arc welding, it is characterized in that, comprising: a welding machine welding output voltage sampling module, for the output voltage of Real-time Collection welding machine; One pulse width modulation drives signaling module, for exporting a pulse width modulation, drives signal threshold value; One comparator U2B, for driving signal threshold value to compare described output voltage and pulse width modulation, controls the break-make of an optocoupler U4 according to comparative result; The output of described optocoupler U4 is connected with the input of a single-chip microcomputer, and described single-chip microcomputer calculates according to the break-make of described optocoupler U4 and regulates described pulse width modulation to drive the output of signal.
2. the control circuit for short circuiting arc welding as claimed in claim 1, it is characterized in that, described welding machine welding output voltage sampling module comprises resistance R 2, the R5 being connected with described welding machine welding output voltage, the output parallel resistance R1 of described resistance R 2 and capacitor C 1, input parallel resistance R4, the R3 of described resistance R 1 and and capacitor C 2, the output of described resistance R 3 is connected with the positive input terminal of described comparator.
3. the control circuit for short circuiting arc welding as claimed in claim 1, it is characterized in that, described pulse width modulation is connected with the input of a comparator U3 after driving signaling module to receive described pulse width modulation driving signal dividing potential drop, the output of described comparator U3 connects an optocoupler U1, the output of described optocoupler U1 is connected with the positive input terminal of a comparator U2A, the output of described optocoupler U1 is connected after a Zener diode ZD1 and is connected with the negative input end of described comparator U2A, and the output of described comparator U2A connects the negative input end of described comparator U2B.
4. the control circuit for short circuiting arc welding as claimed in claim 3, it is characterized in that, described pulse width modulation drives signal to connect a resistance R 7, the output parallel resistance R8 of described resistance R 7 and capacitor C 5, the output of described resistance R 8 connects the positive input terminal of described comparator U3, and the output of described capacitor C 5 connects successively a potentiometer and a resistance R 12 is rear and the negative input end of described comparator U3.
5. the control circuit for short circuiting arc welding as claimed in claim 3, it is characterized in that, an output resistance R 9 in parallel and the capacitor C 7 of described comparator U3, the output of described resistance R 9 is connected with the input of described optocoupler U1, and a resistance R 13 in parallel, capacitor C 4 and described Zener diode ZD1 are successively stated in the output parallel connection of described optocoupler U1.
6. the control circuit for short circuiting arc welding as claimed in claim 3, it is characterized in that, the output of described comparator U2A connects the rear capacitor C 6 in parallel of a resistance R 10 and resistance R 11, and the output of described resistance R 11 is connected with the negative input end of described comparator U2B.
7. the control circuit for short circuiting arc welding as claimed in claim 1, is characterized in that, the output of described comparator U2B is connected with the input of described optocoupler U4 after connecting a resistance R 15.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420375536.7U CN203944974U (en) | 2014-07-09 | 2014-07-09 | A kind of control circuit for short circuiting arc welding |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420375536.7U CN203944974U (en) | 2014-07-09 | 2014-07-09 | A kind of control circuit for short circuiting arc welding |
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| CN203944974U true CN203944974U (en) | 2014-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420375536.7U Withdrawn - After Issue CN203944974U (en) | 2014-07-09 | 2014-07-09 | A kind of control circuit for short circuiting arc welding |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104057177A (en) * | 2014-07-09 | 2014-09-24 | 上海威特力焊接设备制造股份有限公司 | Control circuit for short circuiting transfer welding |
-
2014
- 2014-07-09 CN CN201420375536.7U patent/CN203944974U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104057177A (en) * | 2014-07-09 | 2014-09-24 | 上海威特力焊接设备制造股份有限公司 | Control circuit for short circuiting transfer welding |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20141119 Effective date of abandoning: 20160120 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |