CN1745952A - Circuit for sulting pole-changing plasma arc welding twin arc - Google Patents
Circuit for sulting pole-changing plasma arc welding twin arc Download PDFInfo
- Publication number
- CN1745952A CN1745952A CN 200510112673 CN200510112673A CN1745952A CN 1745952 A CN1745952 A CN 1745952A CN 200510112673 CN200510112673 CN 200510112673 CN 200510112673 A CN200510112673 A CN 200510112673A CN 1745952 A CN1745952 A CN 1745952A
- Authority
- CN
- China
- Prior art keywords
- arc
- current
- welding
- power supply
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Arc Welding Control (AREA)
Abstract
A circuit for eliminating the dual arcs generated when positive polarity become negative one because of the existence of pilot arc in polarity-changing plasma arc welding is composed of high-power IGBT used as the switch transistors T1 and T2 for outputting polarity-changing current, single-chip microprocessor for providing drive signals, welding gun with primary arc switch connected to +15V power supply, the delay relay with normally closed contact for controlling the 'on' time of the power supply for pilot arc, and MOSFET for controlling said power supply of pilot arc.
Description
Technical field
The invention 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 I
1And I
2Two parts, I
1Part 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.High-speed camera figure when the Variable Polarity plasma-arc forms two arc as shown in Figure 3, two arcs appearred in electric arc when the Variable Polarity plasma arc became reversed polarity by positive polarity.
The invention solves above-mentioned plasma arc welding with adjustable polarity parameters and cause the problem that produces two arcs when becoming reversed polarity because of the existence of arc maintenance when connecing by positive polarity.
Summary of the invention
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 the 20KHZ medium frequency alternating current through the prime inversion, and back level inversion is 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.Plasma arc welding with adjustable polarity parameters connects the main power source structure and sees Fig. 4.
A kind of circuit that plasma arc welding with adjustable polarity parameters connects two arcs that solves provided by the invention, 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; 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 in Fig. 4; 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.Shown in Figure 2, even if if turn-off arc maintenance after the minor arc that ignites enters the Variable Polarity welding stage, 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 present invention takes to ignite and cuts off the method for arc maintenance power supply major loop behind the minor arc automatically, has solved the problems referred to above.Circuit structure is seen Fig. 5.
Automatic time delay disconnects the function of arc maintenance power supply major loop behind this minor arc of just 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 ".
Fig. 6 is Variable Polarity plasma-arc high-speed camera figure behind the cut-out arc maintenance power supply major loop.Compare with Fig. 3, cut off arc maintenance power supply major loop and occurred " two arc " afterwards.
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: the form when not cutting off arc maintenance power supply major loop before and after the Variable Polarity plasma-arc zero passage.
Fig. 4: two inverse type plasma arc welding with adjustable polarity parameters connect the electric power main circuit structure chart.
Fig. 5: cut off arc maintenance power supply major loop schematic diagram behind the minor arc that ignites automatically.
Fig. 6: form before and after the Variable Polarity plasma-arc zero passage behind the disconnected arc maintenance power supply major loop of cut-out.
Fig. 7: 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. 7.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, through buffer and current-limiting resistance (R
1And R
2) be input to drive circuit.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.
Fig. 5 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; 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 cuts off A.C. contactor KMI, reaches 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 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; 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510112673 CN1745952A (en) | 2005-10-14 | 2005-10-14 | Circuit for sulting pole-changing plasma arc welding twin arc |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510112673 CN1745952A (en) | 2005-10-14 | 2005-10-14 | Circuit for sulting pole-changing plasma arc welding twin arc |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1745952A true CN1745952A (en) | 2006-03-15 |
Family
ID=36165760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510112673 Pending CN1745952A (en) | 2005-10-14 | 2005-10-14 | Circuit for sulting pole-changing plasma arc welding twin arc |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1745952A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008086676A1 (en) * | 2007-01-16 | 2008-07-24 | Sun, Jiansheng | A plasma power supply for a low-temperature plasma hydrogen peroxide disinfecting and sterilizing apparatus |
| CN101572501B (en) * | 2008-04-30 | 2011-08-03 | 深超光电（深圳）有限公司 | Monitoring circuit |
| CN101400471B (en) * | 2006-12-12 | 2012-05-23 | 松下电器产业株式会社 | Welding equipment |
| CN102922091A (en) * | 2012-11-26 | 2013-02-13 | 甘肃西柴动力机电制造有限公司 | Digitally-controlled multifunctional inverted arc welding machine |
| CN103182596A (en) * | 2013-03-19 | 2013-07-03 | 北京工业大学 | Adaptive variable polarity plasma arc welding power supply |
| CN105817740A (en) * | 2016-05-03 | 2016-08-03 | 深圳市佳士科技股份有限公司 | Welding power source and alternating-current and direct-current argon arc welding machine |
| CN107745174A (en) * | 2017-11-30 | 2018-03-02 | 华南理工大学 | Digitlization variable polarity welding power supply based on SiC IGBT |
-
2005
- 2005-10-14 CN CN 200510112673 patent/CN1745952A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101400471B (en) * | 2006-12-12 | 2012-05-23 | 松下电器产业株式会社 | Welding equipment |
| WO2008086676A1 (en) * | 2007-01-16 | 2008-07-24 | Sun, Jiansheng | A plasma power supply for a low-temperature plasma hydrogen peroxide disinfecting and sterilizing apparatus |
| CN101572501B (en) * | 2008-04-30 | 2011-08-03 | 深超光电（深圳）有限公司 | Monitoring circuit |
| CN102922091A (en) * | 2012-11-26 | 2013-02-13 | 甘肃西柴动力机电制造有限公司 | Digitally-controlled multifunctional inverted arc welding machine |
| 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 |
| CN105817740A (en) * | 2016-05-03 | 2016-08-03 | 深圳市佳士科技股份有限公司 | Welding power source and alternating-current and direct-current argon arc welding machine |
| CN107745174A (en) * | 2017-11-30 | 2018-03-02 | 华南理工大学 | Digitlization variable polarity welding power supply based on SiC IGBT |
| WO2019104864A1 (en) * | 2017-11-30 | 2019-06-06 | 华南理工大学 | Digitized variable-polarity welding power source based on sic igbt |
| CN107745174B (en) * | 2017-11-30 | 2023-08-18 | 华南理工大学 | Digital variable-polarity welding power supply based on SiC IGBT |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN2915347Y (en) | Circuit for solving double arc of polarity-changeable plasma-arc welding | |
| CN101524781B (en) | AC arc welding system and method thereof | |
| CN1745952A (en) | Circuit for sulting pole-changing plasma arc welding twin arc | |
| AU2019443395B2 (en) | A dual-pulse mig welding power source based on sic power devices | |
| CN110421237B (en) | LLC-based double-wire pulse MIG welding power supply system and control method | |
| CN100469505C (en) | Ultrasonic square wave direct current pulse arc-welding power supply device | |
| CN201493592U (en) | Alternating current electric arc welding system | |
| CN102554409B (en) | Digital welding machine with fine welding waveform | |
| CN108422065B (en) | Pulse MIG welding power supply system based on CAN field bus and LLC resonant converter and control method thereof | |
| CN101352776B (en) | Variable polarity welding power supply secondary inverter circuit and control method thereof | |
| CN104052326A (en) | High-power single inversion stud welding machine | |
| CN103418892B (en) | A kind of welding supply and control method that there is energy and keep loop | |
| CN210789615U (en) | LLC-based double-wire pulse MIG welding power supply system | |
| CN210080919U (en) | High-low frequency energy conversion and composite circuit of fast-frequency pulse TIG welding power supply | |
| CN103737154A (en) | High-frequency square-wave DC (Direct Current) pulse coupling power unit used for electrical arc welding | |
| CN207508489U (en) | Digitlization variable polarity welding power supply based on SiC IGBT | |
| CN210080918U (en) | Double-pulse MIG welding power supply based on SiC power device | |
| CN201009039Y (en) | High-frequency IGBT inversion type arc burying welding power source | |
| CN107538106A (en) | Welding machine arc-maintaining device | |
| CN203933438U (en) | A kind of high-power single inversion stud welding machine | |
| CN203292680U (en) | Self-adaptive polarity-variable plasma arc welding power source | |
| CN103182596B (en) | Adaptive variable polarity plasma arc welding power supply | |
| CN204449569U (en) | A kind of gas that reduces protects the circuit welding and splash | |
| CN211939447U (en) | Electric welding machine protection circuit | |
| CN213794729U (en) | Circuit structure of double-channel short-period arc stud welding machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |