CN206047315U - A kind of control circuit of pulsed gas shield welding arc characteristic - Google Patents
A kind of control circuit of pulsed gas shield welding arc characteristic Download PDFInfo
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- CN206047315U CN206047315U CN201621101050.XU CN201621101050U CN206047315U CN 206047315 U CN206047315 U CN 206047315U CN 201621101050 U CN201621101050 U CN 201621101050U CN 206047315 U CN206047315 U CN 206047315U
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- photo
- coupler
- operational amplifier
- welding
- arc
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Abstract
A kind of control circuit of pulsed gas shield welding arc characteristic, the fixed contact of potentiometer is linked in sequence with the emitter stage of first resistor, photo-coupler, the movable contact of potentiometer is connected with the colelctor electrode of photo-coupler, the emitter stage of photo-coupler connects the anode of detector diode, and the colelctor electrode of photo-coupler connects the negative electrode of detector diode；The input signal end of photo-coupler is connected with the output steering device of electric welding machine；The anode of the colelctor electrode of photo-coupler in-phase input end respectively with operational amplifier, one end of second resistance, one end of electric capacity and diode is connected, and the negative electrode of the other end of second resistance, the other end of electric capacity and diode has common earth terminal；The inverting input of the colelctor electrode, 3rd resistor and operational amplifier of photo-coupler is linked in sequence, and the outfan of operational amplifier connects and composes follow circuit with its inverting input, and the outfan of operational amplifier is also connected with current regulation error signal.The circuit can keep the stability of arc characteristic.
Description
Technical field：
This utility model is related to the electric control technical field of pulse MIC welding arc, and more particularly to a kind of pulsed gas is protected
The control circuit of weldering arc characteristic.
Background technology：
Pulse MIC welding method, is also called pulsed metal inert-gas, and consumable electrode is welding wire, protective gas
Main body be noble gases, account for more than the 80% of total shield gas flow rate.The welding current of pulse MIC welding adopts pulse current
Waveform, its object is to superior molten drop spray transfer mode is obtained under relatively low average current.Welding Molten Drop crosses place
When spray transfer mode, electric arc is sufficiently stable, and welding splashes, electric arc heat input and penetrate it is relatively strong, appearance of weld very well, weldering
Seam quality is higher.Direct current MIG welderings will could obtain spray transfer mode more than the critical electric current value of welding wire, pulse MIC welding
Peak point current exceedes welding wire critical electric current value and obtains spray transfer, but its average welding current is very low, is widely used in butt welding
The higher alloy welding for steel structure of prescription and non-ferrous metal welding are connect, especially in above-mentioned metal, the weldering of thin-slab structure
Connect.
During arc maintenance, because back ground current very little, if adopting constant voltage source external characteristics, can cause when disturbance occurs
Back ground current is changed greatly, and is caused arc extinction or the excessive globular transfer mode for producing molten drop of back ground current, is made electric arc
Stability and spray transfer mode are destroyed.So, the generator characteristic that optimum is adopted during arc maintenance is constant-current characteristicses.
Using under conditions of external characteristics of constant current during arc maintenance, if constant-current characteristicses are also adopted by during pulse, electric arc will completely lose self-regulated
Performance, electric arc arc length are lost adaptability and stability completely.So in order that electric arc obtains some self-regulation performances, in pulse period
Between have to adopt constant voltage source external characteristics.
Constant current source external characteristics is have selected during for arcing stability during looking after arc maintenance, arc maintenance；Due to using
Constant-current characteristicses, when disturbance causes arc length to change, back ground current is constant, and such pulse MIC welding electric arc just loses arc during arc maintenance
Long self-regulation performance；Although constant pressure external characteristics has been used during pulse, however, to ensure that stable molten drop spray transfer side
Formula, pulse current variable quantity are also unsuitable excessive.So, for traditional pulse MIC welding electric arc, arc maintenance during without from tonality
Can, the self-regulation performance during pulse is extremely limited, and the self-regulation performance of whole electric arc is very poor, the stability of arc length when disturbance occurs
It is poor with adaptability.Due to traditional pulse MIC welding arc control system, to there is electric arc arc length self-regulation performance in principle poor
Defect, cause it to there is a problem of in the application following several serious：
Firstth, power pulse parameter configuration is sufficiently complex, larger using operation difficulty.
For a certain welding current, the power pulse parameter setting of pulse MIC includes back ground current, arc maintenance width, pulse
Voltage, pulse width and wire feed rate.As the arc length self-regulation performance of electric arc is very poor, the setting of above-mentioned parameter must be very accurate,
The welding wire melting rate that electric arc is produced under set parameter is made accurately to be equal to the wire feed rate of setting, otherwise arc length can be significantly inclined
From normal range, or even normal electric arc can not be obtained.And, in addition to obtaining normal arc length, while will also ensure to obtain
The spray transfer mode of molten drop, this just considerably increases the difficulty that parameter setting and system are used.
Secondth, self adjustability is poor, and when arc length is disturbed, arc length Stability and adaptability is poor；
When being disturbed due to arc length, the variable quantity very little of electric current and welding wire melting rate, the recovery capability of electric arc arc length is very
Difference, the arc length Stability and adaptability of electric arc are very poor.
3rd, droplet transfer stability is poor.
The content of the invention：
In consideration of it, being necessary to design a kind of control circuit for causing arc characteristic stable.
A kind of control circuit of pulsed gas shield welding arc characteristic, fixed contact and first resistor, the optical coupling of potentiometer
The emitter stage of device is linked in sequence, and the movable contact of potentiometer is connected with the colelctor electrode of photo-coupler, the emitter stage connection of photo-coupler
The anode of detector diode, the colelctor electrode of photo-coupler connect the negative electrode of detector diode；The input signal end of photo-coupler with
The output steering device connection of electric welding machine；The colelctor electrode of photo-coupler in-phase input end respectively with operational amplifier, second resistance
One end, one end of electric capacity and diode anode connection, the moon of the other end of second resistance, the other end of electric capacity and diode
Has common earth terminal；The inverting input of the colelctor electrode, 3rd resistor and operational amplifier of photo-coupler is linked in sequence,
The outfan of operational amplifier connects and composes follow circuit with its inverting input, and the outfan of operational amplifier is also adjusted with electric current
Section error signal connection, wherein, current regulation error signal is used to indicate actual welding machine output voltage with given welding machine voltage threshold
The comparison signal of value, given welding machine voltage threshold are used to weigh welding current size.
This utility model controls pulse MIC electric arc as a result of the open loop feedforward control mode of feed rate of welding wire signal
Arc maintenance width or pulse frequency, that is, welding average current and welding wire melting rate have adjusted according to wire feed rate, makes weldering
Silk feed rate and burn-off rate keep dynamic equilibrium, realize pulse parameter and burn-off rate automatically with wire feed rate phase
Match somebody with somebody, keep feed rate of welding wire identical with burn-off rate；As a result of the close loop negative feedback control mode of arc length signal
The arc maintenance width or pulse frequency of control pulse MIC electric arc, that is, weldering have adjusted using negative feedback mode according to arc length
Pulse frequency, average current and the welding wire melting rate of electric current are connect, make feed rate of welding wire and burn-off rate keep dynamic equilibrium,
So, it is able to maintain that the arc length of system is constant when arc length disturbance occurs.Due to above two control mode it is common
Work, so when welding current regulation, wire feed rate disturbance or arc length disturbance occur, welding wire can be kept to be sent into fast
The dynamic equilibrium of degree and burn-off rate, maintains the arc length of system constant.As system is by adjusting pulse MIC electric arc
Arc maintenance width or pulse frequency weld average current regulation and arc length negative-feedback regu- lation to obtain, rather than by adjusting electric current width
Spend to realize arc length negative-feedback regu- lation.So, during arc length negative-feedback regu- lation, the spray transfer mode of molten drop is able to maintain that
It is constant.Because being pulse frequency in the regulated quantity of negative feedback process, and affect the pulse width of droplet transfer mode, peak value of pulse
Electric current and back ground current remain unchanged.
Description of the drawings：
Accompanying drawing 1 is the circuit diagram of the control circuit of the pulsed gas shield welding arc characteristic of a width better embodiment.
Specific embodiment：
As shown in figure 1, a kind of control circuit of pulsed gas shield welding arc characteristic, 2 foot of fixed contact of potentiometer P7 with
First resistor R13,3 foot of emitter stage of photo-coupler U6 are linked in sequence, 1 foot of movable contact of potentiometer P7 and the collection of photo-coupler U6
4 foot of electrode connects, and 3 foot of emitter stage of photo-coupler U6 connects the anode of detector diode D6,4 foot of colelctor electrode of photo-coupler U6
The negative electrode of connection detector diode D6；The input signal end of photo-coupler U6 is connected with the output steering device of electric welding machine；Through one
Then secondary rectification, IGBT inversions, secondary rectification pass through electric welding machine output steering device；4 foot of colelctor electrode of photo-coupler U6 respectively with
The anode of 10 foot of in-phase input end of operational amplifier U2, one end of second resistance R15, one end of electric capacity C6 and diode D7 connects
Connect, the negative electrode of the other end, the other end of electric capacity C6 and diode D7 of second resistance R15 has common earth terminal；Optical coupling
9 foot of inverting input of 4 foot of colelctor electrode, 3rd resistor R16 and operational amplifier U2 of device U6 is linked in sequence, operational amplifier U2
8 foot of outfan and its 9 foot of inverting input connect and compose follow circuit, 8 foot of outfan of 9 foot of operational amplifier also with electric current
Error signal connection is adjusted, wherein, current regulation error signal is used to indicate actual welding machine output voltage with given welding machine voltage
The comparison signal of threshold value, given welding machine voltage threshold are used to weigh welding current size.
The control circuit is negative anti-using the closed loop of the open loop feedforward control mode and arc length signal of feed rate of welding wire
The arc maintenance width or pulse frequency of feedback control mode co- controlling pulse MIC electric arc, to keep feed rate of welding wire and fusing
The dynamic equilibrium of speed, and there is maintenance system by wire feed rate regulation, wire feed rate disturbance or arc length disturbance
Arc length is constant and molten drop spray transfer mode is constant.
Photo-coupler U6 sampled signals are a 10K potentiometer from welding machine output steering device, P7, are put for adjusting computing
The in-phase input end of big device U2, namely 10 foot voltages, and then change the output of 8 feet of U2.The output of 8 feet is connected to electric current and adjusts mistake
On difference signal, when potentiometer P7 adjusts minimum, electric arc is hard, is splashed slightly larger, and when potentiometer is tuned up, electric arc is soft, is splashed slightly
It is little, i.e., can change the inductance of welding machine by this control circuit, be to be made by feedback control with the RC circuits in control circuit
With, power supply outfan produce an equivalent inductance, be mainly reflected in by RC circuit parameters adjustable source load it is short
Electric current rate of climb during road.Implementing may be different for different circuits, for current inner loop, outer voltage
Circuit is realized using the RC loop times constant of voltage error amplifier outfan, so-called adjustment inductance, that is, is adjusted
Resistance in RC loops.
In welding process, according to the electric arc height change of welding gun and workpiece, in starting the arc moment welding wire and mother metal short circuit, electric current
The rate of climb becomes big, and pulse peak current is high so that welding machine inductance becomes big, and electric arc splashes big, by tuning up potentiometer P7, reduces
Welding machine inductance so that arc characteristic softens, reduces splashing degree.
The sampling of welding machine output steering device is a current signal, and photo-coupler U6 is used for the regulation of arc characteristic, can be with
Change the climbing of the current regulation error signal of welding machine, the climbing of current regulation error signal is big, and electric arc splashes big.Electric current
Adjust the climbing speed of error signal real reaction welding current, you can to reflect welding machine inductance size, and then react electric arc
Characteristic.
The pulse MIC welding arc control circuit that this utility model is provided, as a result of feed rate of welding wire signal
Open loop feedforward control mode controls the arc maintenance width or pulse frequency of pulse MIC electric arc, that is, have adjusted according to wire feed rate
Welding average current and welding wire melting rate, make feed rate of welding wire and burn-off rate keep dynamic equilibrium, realize pulse ginseng
Number and burn-off rate are matched with wire feed rate automatically, keep feed rate of welding wire identical with burn-off rate；As a result of electricity
The arc maintenance width or pulse frequency of the close loop negative feedback control mode control pulse MIC electric arc of arc length signals, that is, basis
Arc length have adjusted pulse frequency, average current and the welding wire melting rate of welding current using negative feedback mode, make welding wire
Feed rate and burn-off rate keep dynamic equilibrium, so, it is able to maintain that the electric arc of system is long when arc length disturbance occurs
Degree is constant.As above two control mode is concured, so long in welding current regulation, wire feed rate disturbance or electric arc
When degree disturbance occurs, the dynamic equilibrium of feed rate of welding wire and burn-off rate can be kept, maintain the arc length of system constant.
As system is to weld average current regulation and arc length to obtain by adjusting the arc maintenance width or pulse frequency of pulse MIC electric arc
Negative-feedback regu- lation, rather than by adjusting current amplitude realizing arc length negative-feedback regu- lation.So, in arc length negative-feedback regu- lation mistake
In journey, the spray transfer mode of molten drop is able to maintain that constant.Because being pulse frequency in the regulated quantity of negative feedback process, and affect
The pulse width of droplet transfer mode, pulse peak current and back ground current remain unchanged.
Claims (1)
1. a kind of control circuit of pulsed gas shield welding arc characteristic, it is characterised in that：The fixed contact of potentiometer is electric with first
Resistance, the emitter stage of photo-coupler be linked in sequence, the movable contact of potentiometer is connected with the colelctor electrode of photo-coupler, photo-coupler
Emitter-base bandgap grading connects the anode of detector diode, and the colelctor electrode of photo-coupler connects the negative electrode of detector diode；The input of photo-coupler
Signal end is connected with the output steering device of electric welding machine；The colelctor electrode of photo-coupler in-phase input end respectively with operational amplifier,
The anode connection of one end of second resistance, one end of electric capacity and diode, the other end of second resistance, the other end of electric capacity and two
The negative electrode of pole pipe has common earth terminal；The inverting input of the colelctor electrode, 3rd resistor and operational amplifier of photo-coupler
It is linked in sequence, the outfan of operational amplifier connects and composes follow circuit, the outfan of operational amplifier with its inverting input
Also it is connected with current regulation error signal, wherein, current regulation error signal is used to indicate actual welding machine output voltage and give
The comparison signal of welding machine voltage threshold, given welding machine voltage threshold are used to weigh welding current size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621101050.XU CN206047315U (en) | 2016-10-08 | 2016-10-08 | A kind of control circuit of pulsed gas shield welding arc characteristic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621101050.XU CN206047315U (en) | 2016-10-08 | 2016-10-08 | A kind of control circuit of pulsed gas shield welding arc characteristic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206047315U true CN206047315U (en) | 2017-03-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621101050.XU Withdrawn - After Issue CN206047315U (en) | 2016-10-08 | 2016-10-08 | A kind of control circuit of pulsed gas shield welding arc characteristic |
Country Status (1)
| Country | Link |
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| CN (1) | CN206047315U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106238869A (en) * | 2016-10-08 | 2016-12-21 | 宁夏吴忠市好运电焊机有限公司 | A kind of control circuit of pulsed gas shield welding arc characteristic |
-
2016
- 2016-10-08 CN CN201621101050.XU patent/CN206047315U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106238869A (en) * | 2016-10-08 | 2016-12-21 | 宁夏吴忠市好运电焊机有限公司 | A kind of control circuit of pulsed gas shield welding arc characteristic |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170329 Effective date of abandoning: 20180313 |
|
| AV01 | Patent right actively abandoned |