CN202367329U - Welding control circuit of digitized direct-current pulse MIG (metal-inert gas welding) welding machine - Google Patents
Welding control circuit of digitized direct-current pulse MIG (metal-inert gas welding) welding machine Download PDFInfo
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- CN202367329U CN202367329U CN2011204645182U CN201120464518U CN202367329U CN 202367329 U CN202367329 U CN 202367329U CN 2011204645182 U CN2011204645182 U CN 2011204645182U CN 201120464518 U CN201120464518 U CN 201120464518U CN 202367329 U CN202367329 U CN 202367329U
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Abstract
The utility model relates to a welding control circuit of a digitized direct-current pulse MIG (metal-inert gas welding) welding machine. According to the technical scheme provided by the utility model, the welding control circuit of the digitized direct-current pulse MIG welding machine comprises a first processor and a second processor, and the first processor is connected with a human-machine interface and a speed control circuit of a wire feeder; the first processor is also connected with the second processor, and the input end of the second processor is respectively connected with a current sampling feedback circuit used for sampling the welding current during welding of the welding machine and a voltage feedback sampling circuit used for sampling the welding voltage during welding of the welding machine; and the output end of the second processor is connected with an IGBT (insulated gate bipolar translator) driving circuit, and the second processor is used for outputting corresponding PWM (pulse-width modulation) signals according to welding parameters in the first processor and the feedback current value and the feedback voltage value during operation of the welding machine, so that the arc voltage of the welding machine is kept stable. The welding control circuit of the digitized direct-current pulse MIG welding machine has a simple and compact structure and wide scope of application, can be used and adjusted conveniently, and is safe and reliable, and the use cost can be reduced.
Description
Technical field
The utility model relates to a kind of welding control method and welding control circuit, and especially a kind of welding control circuit of digitlization DC pulse MIG bonding machine belongs to the technical field of MIG bonding machine.
Background technology
The arc characteristic control of existing bonding machine generally all is simulation control; Adopt the fixing difficult change of control mode of simulation; Energy consumption is high, can only accomplish that generally the arc characteristic control under a certain working method is good, and other working method is next bad relatively; Cut and have upgrading difficulty, the problem that the construction cycle is long.
Summary of the invention
The purpose of the utility model is to overcome the deficiency that exists in the prior art, and a kind of welding control circuit of digitlization DC pulse MIG bonding machine is provided, and it is simple and compact for structure, uses easy to adjustly, applied widely, reduces use cost, and is safe and reliable.
According to the technical scheme that the utility model provides, the welding control method of said digitlization DC pulse MIG bonding machine, said welding control method comprises the steps:
A, startup first processor and second processor after the first processor and the second processor communication, show test to man-machine interface;
B, in the EEPROM of first processor the required welding parameter of input, and show the welding parameter of input through man-machine interface;
C, press welding gun and get into corresponding bond pattern, first processor drives the wire-feed motor wire feed according to welding parameter, and makes bonding machine get into the striking subprogram, makes the bonding machine striking;
When d, welding, second processor is exported corresponding PWM with the operating current and the operational voltage value of welding parameter, feedback through the PI control mode, makes bonding machine export stable welding arc; First processor makes bonding machine weld according to set condition according to welding parameter;
E, read the welding gun state, when unclamping welding gun, first processor gets into receives the arc subprogram, and welding process finishes.
Said first processor is a single-chip microcomputer, and second processor is DSP.In the said first processor welding parameter of EEPROM input comprise peak point current Ip, background current Ib, weldingvoltage, time to peak Tp, frequency f, wire feed rate Vm, in advance supply gas time, the time of supplying gas that lags behind, go ball time, solder wire material, gage of wire and operator scheme.
In the said steps d, second processor obtains reference voltage Uf according to the working current value and the operational voltage value of feedback after PI control is calculated, and second processor compares the weldingvoltage of reference voltage Uf that obtains and setting; When reference voltage Uf when setting weldingvoltage, second processor increases base value time T b; When reference voltage Uf when setting weldingvoltage, second processor reduces base value time T b; Second processor makes welding arc voltage and welded condition be complementary according to the pwm signal of base value time T b output respective cycle.
First processor is opened air valve and is supplied gas after getting into the striking subprogram, delays time after 2 seconds, and first processor drives the slow wire feed of wire-feed motor, produces arc voltage; During the striking success, first processor drives wire-feed motor according to the wire feed rate Vm wire feed of setting after the thermal pulse transition; During the striking failure, first processor stops to court death of wire-feed motor, turn-offs the power supply of bonding machine, stops to supply gas.
Said welding wire material comprises aluminium, magnadure, carbon steel or stainless steel.
The welding control circuit of said digitlization DC pulse MIG bonding machine comprises the first processor and second processor, and said first processor links to each other with man-machine interface and wire-feed motor alignment circuit; First processor links to each other with second processor, and the input of second processor respectively when being used for bonding machine welded the current sample feedback circuit of welding current sampling and weldingvoltage is sampled when being used for bonding machine weld voltage feedback sampling circuit link to each other; The output of second processor links to each other with the IGBT drive circuit, second processor during according to the work of the welding parameter in the first processor, bonding machine feedback current value and feedback voltage value export corresponding pwm signal, make the arc voltage of bonding machine keep stable.
Said IGBT drive circuit links to each other with the IGBT half-bridge inversion circuit; The input of said IGBT half-bridge inversion circuit links to each other with three-phase input rectifying filter circuit; The output of IGBT half-bridge inversion circuit links to each other with the filtering high-frequency rectifier output circuit through the medium frequency inverter transformer, and said filtering high-frequency rectifier output circuit links to each other with bonding machine.
The input of said second processor also links to each other with holding circuit.Said current sample feedback circuit is a Hall current sensor, and the voltage sample feedback circuit is the Hall voltage sensor.
The advantage of the utility model: first processor adopts single-chip microcomputer, and the second processor adopting DSP through the corresponding matching of the first processor and second processor, realizes the welding control of digitlization DC pulse; Improve the adaptability of different welding; In the eeprom memory of first processor, import welding parameter, improve the operability that the following adopted same weld is provided with, improve welding efficiency; During welding; First processor is provided with the driving wire-feed motor according to welding parameter and carries out wire feed, and second processor can be regulated the cycle of output pwm signal according to current value, magnitude of voltage and the welding parameter of feedback; Can the droplet transfer of bonding machine be control effectively; Realized effective control, can protect the overcurrent of whole welding process, overheated and overvoltage, improved the reliability of entire circuit work according to the current value, magnitude of voltage of feedback to arc length; Compact conformation reduces use cost.
Description of drawings
Fig. 1 is the flow chart of the utility model welding control.
Fig. 2 is the flow chart of the utility model striking subprogram.
Fig. 3 receives the flow chart of arc subprogram for the utility model.
Fig. 4 is the structured flowchart of the utility model.
The specific embodiment
Below in conjunction with concrete accompanying drawing and embodiment the utility model is described further.
As shown in Figure 4: the welding control circuit of said digitlization DC pulse MIG (melting pole gas shielded arc welding) bonding machine comprises the first processor and second processor; Particularly; First processor adopts single-chip microcomputer (MCU); The second processor adopting DSP (digital signal processor) through the high-speed computation ability of second processor, can make the arc voltage of bonding machine to keep stable fast.First processor links to each other with second processor, and first processor links to each other with man-machine interface, and first processor can show corresponding welding parameter through man-machine interface; The output of first processor links to each other with the wire-feed motor alignment circuit, can regulate the wire feed rate of wire-feed motor through the wire-feed motor alignment circuit.The input of second processor links to each other with current sample feedback circuit and voltage sample feedback circuit; Electric current and voltage when current sample feedback circuit and voltage sample feedback current are respectively applied for the bonding machine welding job are sampled; The current sample feedback circuit is a Hall current sensor, and the voltage sample feedback circuit is the Hall voltage sensor.Second processor is according to the welding parameter of setting in the feedback current value, the feedback voltage value that obtain and the processor of answering questions; Export corresponding pwm signal according to the PI control algolithm; Said bonding machine produces corresponding arc voltage according to pwm signal, can keep the stability of bonding machine droplet transfer.
Single-chip microcomputer and DSP digital signal processor comprise reset circuit, clock circuit.Reset circuit guarantees the normal startup of MCU and DSP, and clock circuit provides the clock cycle of MCU and DSP work, in said MCU and the DSP EEPROM is arranged; FLASH, timer, house dog; Also comprise A/D converter; It can convert the analog signal input quantity of Hall voltage sensor and Hall current sensor into the required digital quantity of DSP, and said charactron display circuit adopts the digital display control chip, and it links to each other with the output of single-chip microcomputer.
Second processor links to each other with the IGBT half-bridge inversion circuit through the IGBT drive circuit; The input of IGBT half-bridge inversion circuit links to each other with three-phase input rectifying filter circuit; The output of IGBT half-bridge inversion circuit links to each other with the medium frequency inverter transformer; The medium frequency inverter transformer links to each other with bonding machine through the filtering high-frequency rectifier output circuit, thereby can make bonding machine produce the welding arc voltage of corresponding requirements.The input of second processor also links to each other with holding circuit; When Hall current sensor and Hall voltage sensor detect corresponding work electric current, operating voltage; First processor compares current value, magnitude of voltage and the setting welding parameter of feedback; When overcurrent, overvoltage occurring or when overheated, holding circuit can be protected whole welding system.
Like Fig. 1, Fig. 2 and shown in Figure 3: according to the described welding control circuit of Fig. 4, the welding control method of said digitlization DC pulse MIG bonding machine comprises the steps:
A, startup first processor and second processor after the first processor and the second processor communication, show test to man-machine interface;
Through showing that test can know LED luminous tube and the seven segment digital tubes operate as normal whether on the man-machine interface, just can confirm if damaged through showing to test; If show this process of test, even LED luminous tube or seven segment digital tubes have damaged also and can't know so, finally the correct use to bonding machine brings puzzlement, when definite man-machine interface damage, can be convenient for changing corresponding man-machine interface; Had and shown that this process of test brings very big help to the correct use of bonding machine.
B, in the EEPROM of first processor the required welding parameter of input, and show the welding parameter of input through man-machine interface;
First processor has eeprom memory and FLASH memory, and wherein, EEPROM is used to store data, and the FLASH memory is used for the storage program; The welding parameter of in the EEPROM of first processor, importing comprise peak point current Ip, background current Ib, weldingvoltage V, time to peak Tp, frequency f, wire feed rate Vm, in advance supply gas time, the time of supplying gas that lags behind, go ball time, solder wire material, gage of wire, operator scheme (two steps; Four steps, special four steps); Seven segment digital tubes peak value display electric current I p value, weldingvoltage V value, solder wire material, led lamp indication gage of wire, operator scheme.Wherein, frequency f is the frequency of droplet transfer, through frequency f can the Reaction Welding machine the voltage of droplet transfer, solder wire material comprises aluminium, almag, carbon steel or stainless steel.Behind above-mentioned welding parameter input eeprom memory, first processor can directly read the welding parameter of last input, and can use as this welding parameter, when carrying out twice same weld operation, can improve the welding operation time; When needs upgraded welding parameter, through importing corresponding welding parameter, first processor can be controlled wire-feed motor and bonding machine and carry out corresponding welding operation according to the welding parameter and the interior welding parameter of preserving of EEPROM of new input.
C, press welding gun and get into corresponding bond pattern, first processor drives the wire-feed motor wire feed according to welding parameter, and makes bonding machine get into the striking subprogram, makes the bonding machine striking;
When pressing welding gun, according to gage of wire, solder wire material and the bond pattern that EEPROM selects, first processor drives wire-feed motor and carries out slow wire feed, and gets into the striking subprogram of setting in the FLASH memory; After getting into the striking subprogram, open air valve and supply gas, delayed time 2 seconds, because welding wire near workpiece, makes gas ionization produce arc voltage; After obtaining corresponding arc voltage, the striking success, after the striking success, through the thermal pulse transition of air valve, first processor drives wire-feed motor and carries out wire feed according to the wire feed rate of setting, so that carry out welding operation; After the striking failure, first processor stops the wire feed of wire-feed motor, and powered-down closes gas check valve, stops to supply gas, and can not weld, and need carry out the striking operation again.
When d, welding, second processor is exported pwm control signal with the operating current and the operational voltage value of welding parameter, feedback through the PI control mode, makes bonding machine export stable welding arc; First processor makes bonding machine weld according to set condition according to welding parameter;
Utilize the powerful data-handling capacity efficiently of DSP, obtain corresponding time value, then the time value that obtains is deducted time to peak Tp and obtain base value time T b, realize dissolving the foundation of dripping stable transition to base value time T b as regulating arc length through frequency f.Because it is highly consistent that welding gun is difficult to keep in welding job; Often teetertotter and cause that arc voltage frequently changes in the welding process; In DSP, obtain reference voltage Uf to Hall current sensor behind the process PI algorithm through the value of feedback of A/D conversion value through A/D conversion value and Hall voltage sensor; Benefit through PI (proportional integral) algorithm is to reduce the interference that produces in the welding process, and integral element can be eliminated steady-state error.When DSP carried out the PI algorithm, DSP compared through the magnitude of voltage that A/D is converted to the Hall voltage sensor with preset weldingvoltage, obtain a difference.In bonding machine; The magnitude of voltage that the Hall voltage sensor sample obtains has comprised the information of electric current; The voltage difference that current sampling is calculated carries out ratio and integral operation, and with the reference voltage Uf addition that previous moment obtains, obtain current reference voltage Uf value; Compare with preset weldingvoltage V obtaining current reference voltage Uf, decide the variation of base value time T b.When reference voltage Uf carries out the transition to background current Ib by peak point current Ip during greater than preset welding voltage value V naturally, promptly increase base value time T b; Otherwise carry out the transition to background current Ib naturally by peak point current Ip, promptly reduce base value time T b; The cycle that DSP exports corresponding pwm signal according to adjusted base value time T b; Pwm signal according to output is regulated the arc voltage of bonding machine, thereby makes droplet transfer in the welding process, changes melting speed and keeps arc voltage stability; Minimizing is splashed, and guarantees the quality and the reliability of welding process.
E, read the welding gun state, when unclamping welding gun, first processor gets into receives the arc subprogram, and welding process finishes.
When welding process finishes, unclamp welding gun, first processor gets into receives the arc subprogram, after the arc subprogram is received in entering; First processor detects wire feed rate, pulse current and the frequency of wire-feed motor, and when wire feed rate was non-vanishing, first processor sent speed zero setting with wire-feed motor; Stop the wire feed of wire-feed motor, cut off the voltage of bonding machine, delay adjustments is after the time; Stop to supply gas, return main program, the beginning of welding process next time by the time.
Like Fig. 1 ~ shown in Figure 4: during work, start the first processor and second processor, man-machine interface is carried out functional test, to confirm whether man-machine interface can complete display parameters according to the man-machine interface test program in the first processor.After the test, in the eeprom memory of first processor, import required welding parameter, and show the welding parameter of corresponding input through man-machine interface through corresponding button.After input is accomplished, press welding gun after, first processor gets into welding gun striking subprogram, makes that welding gun can striking; After the striking; Second processor is according to current value, magnitude of voltage and the welding parameter of feedback; Come to regulate the cycle of output pwm signal, thereby bonding machine can produce corresponding arc voltage according to pwm signal, improve the stable arc voltage of bonding machine droplet transfer through the base value time T b that obtains; Reduction is splashed, the influence to welding when reducing the welding gun instability.When welding finished, first processor gets into received the arc subprogram, waits for the beginning of welding process next time.
Embodiment
For example solder wire material is an aluminium, and gage of wire is 1.2, adopts two step bond patterns.During work, opening power is pressed the solder wire material button and is chosen aluminium, and seven segment digital tubes shows the code of aluminium welding wire material.Press the gage of wire button and select the welding wire of 1.2 diameters, indicate the LED lamp of 1.2 welding wires to light.Press the bond pattern button and select two step buttons to select, two steps welding LED lights.Set welding peak point current and welding background current, regulate rotary encoder and regulate peak point current and background current, the peak value welding current of seven segment digital tubes display setting and base value welding current.Welding parameter after the adjusting all deposits the EEPROM of single-chip microcomputer in.After setting welding current.After pressing welding gun, the voltage when electric current when striking success back seven segment digital tubes shows welding and welding.
The utility model first processor adopts single-chip microcomputer, and the second processor adopting DSP through the corresponding matching of the first processor and second processor, realizes the welding control of digitlization DC pulse; Improve the adaptability of different welding; In the eeprom memory of first processor, import welding parameter, improve the operability that the following adopted same weld is provided with, improve welding efficiency; During welding; First processor is provided with the driving wire-feed motor according to welding parameter and send, and second processor can be regulated the cycle of output pwm signal according to current value, magnitude of voltage and the welding parameter of feedback; Can the droplet transfer of bonding machine be control effectively; Realized effective control, can protect the overcurrent of whole welding process, overheated and overvoltage, improved the reliability of entire circuit work according to the current value, magnitude of voltage of feedback to arc length; Compact conformation reduces use cost.
Claims (4)
1. the welding control circuit of a digitlization DC pulse MIG bonding machine, it is characterized in that: comprise the first processor and second processor, said first processor links to each other with man-machine interface and wire-feed motor alignment circuit; First processor links to each other with second processor, and the input of second processor respectively when being used for bonding machine welded the current sample feedback circuit of welding current sampling and weldingvoltage is sampled when being used for bonding machine weld voltage feedback sampling circuit link to each other; The output of second processor links to each other with the IGBT drive circuit, second processor during according to the work of the welding parameter in the first processor, bonding machine feedback current value and feedback voltage value export corresponding pwm signal, make the arc voltage of bonding machine keep stable.
2. the welding control circuit of digitlization DC pulse MIG bonding machine according to claim 1; It is characterized in that: said IGBT drive circuit links to each other with the IGBT half-bridge inversion circuit; The input of said IGBT half-bridge inversion circuit links to each other with three-phase input rectifying filter circuit; The output of IGBT half-bridge inversion circuit links to each other with the filtering high-frequency rectifier output circuit through the medium frequency inverter transformer, and said filtering high-frequency rectifier output circuit links to each other with bonding machine.
3. the welding control circuit of digitlization DC pulse MIG bonding machine according to claim 1, it is characterized in that: the input of said second processor also links to each other with holding circuit.
4. the welding control circuit of digitlization DC pulse MIG bonding machine according to claim 1 is characterized in that: said current sample feedback circuit is a Hall current sensor, and the voltage sample feedback circuit is the Hall voltage sensor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204645182U CN202367329U (en) | 2011-11-21 | 2011-11-21 | Welding control circuit of digitized direct-current pulse MIG (metal-inert gas welding) welding machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011204645182U CN202367329U (en) | 2011-11-21 | 2011-11-21 | Welding control circuit of digitized direct-current pulse MIG (metal-inert gas welding) welding machine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102398101A (en) * | 2011-11-21 | 2012-04-04 | 无锡市南方电器制造有限公司 | Welding control method of a digitalized direct current pulse MIG welding machine and welding control circuit thereof |
| CN103100785A (en) * | 2013-02-28 | 2013-05-15 | 广州市长胜焊接设备实业有限公司 | Digitization inversion arc welding machine output pole short circuit automatic protection system |
| CN113814525A (en) * | 2021-10-29 | 2021-12-21 | 唐山松下产业机器有限公司 | Pulse welding method and system |
-
2011
- 2011-11-21 CN CN2011204645182U patent/CN202367329U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102398101A (en) * | 2011-11-21 | 2012-04-04 | 无锡市南方电器制造有限公司 | Welding control method of a digitalized direct current pulse MIG welding machine and welding control circuit thereof |
| CN103100785A (en) * | 2013-02-28 | 2013-05-15 | 广州市长胜焊接设备实业有限公司 | Digitization inversion arc welding machine output pole short circuit automatic protection system |
| CN103100785B (en) * | 2013-02-28 | 2015-11-25 | 广州长胜机电有限公司 | A kind of digitlization inverter arc welding machine output stage short circuit automatic protective system |
| CN113814525A (en) * | 2021-10-29 | 2021-12-21 | 唐山松下产业机器有限公司 | Pulse welding method and system |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120808 Termination date: 20141121 |
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