CN2915347Y - Circuit for solving double arc of polarity-changeable plasma-arc welding - Google Patents
Circuit for solving double arc of polarity-changeable plasma-arc welding Download PDFInfo
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- CN2915347Y CN2915347Y CN 200520128065 CN200520128065U CN2915347Y CN 2915347 Y CN2915347 Y CN 2915347Y CN 200520128065 CN200520128065 CN 200520128065 CN 200520128065 U CN200520128065 U CN 200520128065U CN 2915347 Y CN2915347 Y CN 2915347Y
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Abstract
The utility model belongs to the welding field, which solves the problem of that the positive polarity changes into the negative polarity to generate the double arc due to the existence of the pilot arc when welding the variable polarity plasma arc. The circuit uses the high-power IGBT as a switch tube T1 and a switch tube T2 outputted by the variable polarity current gained through the second inverter, and a driving signal is given by a single chip machine; one end of a main arc switch of a welding torch is connected with the current of +15 V, when the main arc welding torch is opened, the current of +15 V is connected to a delay relay J; K is the normally closed contact of the delay relay J, one end of K is connected with the current of +15 V and its other end is connected with a grid electrode of a MOSFET pipe; the MOSFET pipe is connected with the main circuit of the pilot arc power supply in series. The circuit is mainly used in the double-sided forming technology of the thick-plate aluminum alloy single-sided welding for the aerospace, which has simple structure, good reliability and strong magnetic biasing resistance.
Description
Technical field
The utility model belongs to welding technology field.Be mainly used in Aero-Space thick aluminum alloy plate one side welding with back formation technology.
Background technology
Plasma arc welding with adjustable polarity parameters meets method VPPAW and compares with tungsten argon arc TIG or welding MIG, characteristics such as have that concentration of energy, arc stiffness are big, penetration depth is big and post welding distortion is little.Alloyed aluminium variable polarity perforation PLASMA ARC WELDING technology advantage in the welding of Aero-Space important structure is comparatively obvious.
Yan Jiu plasma arc welding with adjustable polarity parameters connect the problem that power supply mainly exists and is in the past, and the source of welding current is the square wave alternating-current power supply of controllable silicon formula or the Variable Polarity power supply of controllable silicon formula, and its principle as shown in Figure 1.300A main power source and 100A accessory power supply are formed.Regulate controllable silicon 1,2,3,4 drivings and accessory power supply and can obtain the Variable Polarity electric current.Silicon controlled service time is generally 1～6us, yet its turn-off time is very long, is generally tens microseconds.Thereby the zero-crossing timing of sort circuit is very long, makes that the electric current that flows through arc space before and after the zero passage is very little, and the temperature of arc space is very low.Under little electric current welding situation, plasma-arc is difficult for igniting when changeing reversed polarity by positive polarity.Therefore, must connect arc maintenance in the welding process.
In the plasma arc welding with adjustable polarity parameters termination process, lead, when arc maintenance exists simultaneously, Variable Polarity minor arc and arc maintenance interference phenomenon occur.After turn-offing arc maintenance, can solve main, arc maintenance interference phenomenon, but at this moment if do not cut off arc maintenance power supply major loop, mains current I and arc shape were as shown in Figure 2 when electric arc became reversed polarity by positive polarity.Mains current I is divided into I1 and I2 two parts, and the I1 part is scurried into arc maintenance power supply major loop through arc maintenance power supply outputting inductance and commutation diode, forms the electric arc between nozzle and the workpiece, and promptly plasma-arc forms " two arc ".The arc welding of two arc article on plasma causes adverse effect.Two arcs appearred in electric arc when the Variable Polarity plasma arc became reversed polarity by positive polarity.
When having solved above-mentioned plasma arc welding with adjustable polarity parameters and connect, the utility model causes the problem that produces two arcs when becoming reversed polarity by positive polarity because of the existence of arc maintenance.
The utility model content
The utility model purpose provides a kind of circuit that plasma arc welding with adjustable polarity parameters connects two arcs that solves, " when connecing, the solution plasma arc welding with adjustable polarity parameters has the problem that produces two arcs because of arc maintenance.The development of new plasma arc welding with adjustable polarity parameters connects power supply, has the problem that produces two arcs because of arc maintenance when the solution plasma arc welding with adjustable polarity parameters connects.Welding main power source main circuit adopts two inverse type circuit structures, obtains 20KH through the prime inversion
zMedium frequency alternating current, back level inversion are transformed into direct current the low frequency ac that is fit to aluminium alloy plasma perforation vertical position welding technology.Inversion unit has adopted the half bridge inverter circuit topological structure, advantage such as that this circuit has is simple in structure, good reliability and anti-magnetic bias ability are strong.
The utility model provides a kind ofly solves the circuit that plasma arc welding with adjustable polarity parameters connects two arcs, structure is as follows, the three-phase main-frequency alternating current is successively through the full-wave rectification of air switch K, A.C. contactor KM1 and three phase rectifier module BR1 and the filtering of capacitor C O, to become 540V direct current stably, and supply with the IGBT half-bridge inversion circuit; The 540V direct current is by IGBT switching tube G
1, G
2Break-make and the effect of discharging and recharging of capacitor C 1, C2 and isolation and the step-down of transformer TM, become the low-voltage and high-current alternating current of 20KHz, become the direct current of straight low-voltage and high-current again through fast recovery diode D rectification, ferromagnetic inductor filter effect with upper frequency; The T1 colelctor electrode and and the T2 emitter stage receive respectively on two coils of ferristor; T1 and T2 are connected in series, and are connected to workpiece from center tap; Be connected to welding gun behind the centre cap serial connection coupling transformer of transformer TM; The Variable Polarity electric current that under the conducting effect in turn of power switch pipe T1 and T2 the low-voltage and high-current direct current is become between welding gun and the workpiece is exported; Welding current is by current sensor senses; PWM decides frequency and transfers pulsewidth+PFM to decide the given signal of pulsewidth frequency modulation rate mixed and closed-loop control circuit according to detected welding current and single chip machine controlling circuit, the driving signal is provided for a drive circuit; PWM+PFM mixed and closed-loop control circuit can send under-voltage, overheated, over-current signal, and cut-out A.C. contactor KMI, reach the effect of the protection source of welding current when breaking down, it is characterized in that, select for use high-power IGBT to obtain switch transistor T 1 and the T2 that the Variable Polarity electric current is exported, drive signal and provide by single-chip microcomputer as the secondary inversion;
The minor arc switch one termination+15V of welding gun; General+15V electricity is received time-delay relay J when opening the minor arc switch; K is the normally-closed contact of time-delay relay J, its one termination+15V, the grid of another termination MOSFET pipe; The MOSFET pipe is serially connected on the arc maintenance power supply major loop; Time-delay relay does not move before the minor arc switch is opened, and this moment, the MOSFET pipe was in opening state, and promptly arc maintenance power supply major loop is in conducting state; General+15V electricity is received time-delay relay J when opening the minor arc switch, so time-delay relay is by the time action of setting, normally-closed contact K disconnection; After normally-closed contact K disconnected, the MOSFET pipe lost the driving signal and turn-offs, and promptly arc maintenance power supply major loop disconnects.
T1 and T2 are disconnected at MCU driving signal and the circulation of secondary inverse changing driving circuit effect lower whorl, so just form Variable Polarity electric arc between workpiece and plasma gun.IGBT to open speed faster than controllable silicon, service time is in 1us, it is highly beneficial that this crosses zero velocity to raising Variable Polarity plasma-arc, and owing to take single-chip microcomputer the driving signal to be provided for secondary inverse switch pipe, control accuracy is improved, thereby has solved Variable Polarity plasma-arc cross zero stability problem.After Variable Polarity plasma-arc zero passage instability problem was resolved, arc maintenance was ineffective in normal welding process, can remove arc maintenance.Even if turn-off arc maintenance after minor arc enters the Variable Polarity welding stage if ignite, if do not cut off the arc maintenance major loop, mains current will be scurried into arc maintenance power supply major loop during reversed polarity, forms two arcs.The utility model is taked to ignite and is cut off the method for arc maintenance power supply major loop behind the minor arc automatically, has solved the problems referred to above.
Effect of the present invention: automatic time delay disconnects the function of arc maintenance power supply major loop behind the minor arc of having realized igniting, thereby can avoid plasma arc welding with adjustable polarity parameters to connect during the reversed polarity, and the minor arc electric current is scurried into arc maintenance power supply major loop and formed " two arc ".
Description of drawings
Fig. 1: the controllable silicon plasma arc welding with adjustable polarity parameters connects power supply
Fig. 2: plasma arc welding with adjustable polarity parameters connect arc shape during the reversed polarity when arc maintenance existed
Fig. 3: two inverse type plasma arc welding with adjustable polarity parameters connect the electric power main circuit structure chart.
Fig. 4: cut off arc maintenance power supply major loop schematic diagram behind the minor arc that ignites automatically.
Fig. 5: the secondary inversion schematic diagram of MCU driving.
The specific embodiment
Main power source jointly controls an inversion IGBT driving of circuit control through PWM and PFM, and obtains external characteristics of constant current.Current detecting adopts Hall element, and Hall element is to make according to hall principle, and precision height, response speed are fast.Drive circuit is the interface of main circuit and control circuit; the reliability of drive circuit has important function to main power source stability; its effect is exactly the pwm pulse that control circuit is exported to be amplified to be enough to driving switch power tube IGBT; and have the main circuit over-current detection and block pwm pulse, the effect of protection main circuit.One time the inverse changing driving circuit core is the special-purpose driver module of EXB841, and secondary inversion driven in synchronism waveform is provided by single-chip microcomputer, and principle is seen Fig. 5.Two P1.1 mouth and outputs of P1.2 mouth that drive signals by single-chip microcomputer, and with the front and back of given peak ripple current along being benchmark, be input to drive circuit through buffer and current-limiting resistance (R1 and R2).Secondary inversion IGBT drive circuit is a core with M57962L, has photoelectricity isolation and functions such as power amplification and overcurrent protection.The opposite level signal of two groups of phase places through drive circuit photoelectricity isolate, power amplification rear drive secondary inverter power switching tube.The level phase place of programmed settings P1.1 and P1.2 can realize two power switch pipe T1 of secondary inversion and T2 by the accurate alternate conduction of setting value, connects electric current thereby form plasma arc welding with adjustable polarity parameters between workpiece and welding gun.The welding gun output is connected to coupling transformer, and the high-frequency high-voltage signal that hf arc starter is produced is coupled in the output loop, plays the high-frequency arc strike effect.
Effect.
Fig. 4 is an electrical connection diagram of realizing opening automatic disconnection arc maintenance power supply major loop behind the minor arc.Serial connection MOSFET pipe on the arc maintenance power supply major loop is controlled by the break-make that realizes arc maintenance power supply major loop of opening and turn-off of MOSFET pipe.Minor arc arc welding gun switch one termination+15V electricity, the time-delay relay normally-closed contact K one termination+15V electricity that continues of delaying time, the other end is received the grid of MOSFET pipe.This moment, the MOSFET pipe was in opening state, and promptly arc maintenance power supply major loop is in conducting state.General+15V electricity is received time-delay relay J when opening the minor arc welding gun, so time-delay relay is by the time action of setting, normally-closed contact K disconnection.After normally-closed contact K disconnected, the MOSFET pipe lost the driving signal and turn-offs, and promptly arc maintenance power supply major loop disconnects.Automatic time delay disconnects the function of arc maintenance power supply major loop behind this minor arc of just having realized igniting.
Claims (1)
1, a kind ofly solves the circuit that plasma arc welding with adjustable polarity parameters connects two arcs, structure is as follows, the three-phase main-frequency alternating current is successively through the full-wave rectification of air switch K, A.C. contactor KM1 and three phase rectifier module BR1 and the filtering of capacitor C 0, to become 540V direct current stably, and supply with the IGBT half-bridge inversion circuit; The 540V direct current is by IGBT switching tube G
1, G
2Break-make and the effect of discharging and recharging of capacitor C 1, C2 and isolation and the step-down of transformer TM, become the low-voltage and high-current alternating current of 20KHz, become the direct current of straight low-voltage and high-current again through fast recovery diode D rectification, ferromagnetic inductor filter effect with upper frequency; The T1 colelctor electrode and and the T2 emitter stage receive respectively on two coils of ferristor; T1 and T2 are connected in series, and are connected to workpiece from center tap; Be connected to welding gun behind the centre cap serial connection coupling transformer of transformer TM; Welding current is by current sensor senses; PWM decides frequency and transfers pulsewidth+PFM to decide the given signal of pulsewidth frequency modulation rate mixed and closed-loop control circuit according to detected welding current and single chip machine controlling circuit, the driving signal is provided for a drive circuit;
It is characterized in that, select for use high-power IGBT to obtain switch transistor T 1 and the T2 that the Variable Polarity electric current is exported, drive signal and provide by single-chip microcomputer as above-mentioned secondary inversion;
The minor arc switch one termination+15V of above-mentioned welding gun; General+15V electricity is received time-delay relay J when opening the minor arc welding gun; K is the normally-closed contact of time-delay relay J, its one termination+15V, the grid of another termination MOSFET pipe; The MOSFET pipe is serially connected on the arc maintenance power supply major loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520128065 CN2915347Y (en) | 2005-10-14 | 2005-10-14 | Circuit for solving double arc of polarity-changeable plasma-arc welding |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520128065 CN2915347Y (en) | 2005-10-14 | 2005-10-14 | Circuit for solving double arc of polarity-changeable plasma-arc welding |
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| CN2915347Y true CN2915347Y (en) | 2007-06-27 |
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| CN 200520128065 Expired - Fee Related CN2915347Y (en) | 2005-10-14 | 2005-10-14 | Circuit for solving double arc of polarity-changeable plasma-arc welding |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103100783A (en) * | 2013-03-06 | 2013-05-15 | 北京工业大学 | Double arc hybrid welding power supply device |
| CN103182596A (en) * | 2013-03-19 | 2013-07-03 | 北京工业大学 | Adaptive variable polarity plasma arc welding power supply |
| CN103192167A (en) * | 2013-03-25 | 2013-07-10 | 北京工业大学 | Double-consumable-electrode transfer electric arc hybrid welding power supply device |
| CN107225314A (en) * | 2017-06-22 | 2017-10-03 | 华南理工大学 | Reversed polarity plasma arc robot increasing material manufacturing system and its implementation |
| CN108296617A (en) * | 2018-03-07 | 2018-07-20 | 上海威特力焊接设备制造股份有限公司 | Regulating current device and method for plasma cutting machine |
| CN114247966A (en) * | 2021-12-16 | 2022-03-29 | 北京工业大学 | Dual-wire dissimilar material welding and additive method based on variable polarity power supply |
| CN114247962A (en) * | 2021-12-16 | 2022-03-29 | 北京工业大学 | Multi-electrode time-sharing conduction and polarity-changing alternating arc welding and material adding method |
-
2005
- 2005-10-14 CN CN 200520128065 patent/CN2915347Y/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103100783A (en) * | 2013-03-06 | 2013-05-15 | 北京工业大学 | Double arc hybrid welding power supply device |
| CN103100783B (en) * | 2013-03-06 | 2015-03-25 | 北京工业大学 | Double arc hybrid welding power supply device |
| CN103182596A (en) * | 2013-03-19 | 2013-07-03 | 北京工业大学 | Adaptive variable polarity plasma arc welding power supply |
| CN103182596B (en) * | 2013-03-19 | 2015-06-03 | 北京工业大学 | Adaptive variable polarity plasma arc welding power supply |
| CN103192167A (en) * | 2013-03-25 | 2013-07-10 | 北京工业大学 | Double-consumable-electrode transfer electric arc hybrid welding power supply device |
| CN103192167B (en) * | 2013-03-25 | 2015-09-02 | 北京工业大学 | A kind of two consumable electrode transferred arc composite welding supply unit |
| CN107225314A (en) * | 2017-06-22 | 2017-10-03 | 华南理工大学 | Reversed polarity plasma arc robot increasing material manufacturing system and its implementation |
| CN107225314B (en) * | 2017-06-22 | 2022-07-26 | 华南理工大学 | Additive manufacturing system of reversed polarity plasma arc robot and implementation method thereof |
| CN108296617A (en) * | 2018-03-07 | 2018-07-20 | 上海威特力焊接设备制造股份有限公司 | Regulating current device and method for plasma cutting machine |
| CN108296617B (en) * | 2018-03-07 | 2023-06-20 | 上海威特力焊接设备制造股份有限公司 | Current regulating device and method for plasma cutting machine |
| CN114247966A (en) * | 2021-12-16 | 2022-03-29 | 北京工业大学 | Dual-wire dissimilar material welding and additive method based on variable polarity power supply |
| CN114247962A (en) * | 2021-12-16 | 2022-03-29 | 北京工业大学 | Multi-electrode time-sharing conduction and polarity-changing alternating arc welding and material adding method |
| CN114247962B (en) * | 2021-12-16 | 2023-02-28 | 北京工业大学 | Multi-electrode time-sharing conduction and polarity-changing alternating arc welding and material adding method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070627 Termination date: 20131014 |