CN202804445U - Arc voltage tacking pulse submerged arc welding control circuit and welding machine - Google Patents
Arc voltage tacking pulse submerged arc welding control circuit and welding machine Download PDFInfo
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- CN202804445U CN202804445U CN2012203838360U CN201220383836U CN202804445U CN 202804445 U CN202804445 U CN 202804445U CN 2012203838360 U CN2012203838360 U CN 2012203838360U CN 201220383836 U CN201220383836 U CN 201220383836U CN 202804445 U CN202804445 U CN 202804445U
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Abstract
The utility model relates to an arc voltage tacking pulse submerged arc welding control circuit and welding machine. The arc voltage tacking pulse submerged arc welding control circuit comprises a voltage given unit, a frequency regulating unit, an arc tracking unit, the peak value and basic value regulating unit and an inverter unit, wherein the voltage given unit and arc tracking unit are respectively connected with the frequency regulating unit, and the frequency regulating unit is sequentially connected with the peak value and basic value regulating unit and the inverter unit. The arc voltage tacking pulse submerged arc welding control circuit and welding machine have the advantages that heat input quantities can be effectively controlled, common defects of the incomplete fusion of the first welding line being welded can be effectively solved, the welding line quality and welding efficiency are improved, the circuit controlling is simple, the implementation cost is low, the production technique is simple, and the performance is good.
Description
Technical field
The utility model relates to the submerged-arc welding of a kind of arc voltage trace pulse, belongs to the submerged arc welding equipment technical field.
Background technology
Along with the development of national economy, submerged-arc welding is more and more wider in the application in the fields such as industrial processes, shipbuilding, chemical metallurgy, and welding requirements is also more and more higher.But traditional submerged arc welding electric power switching loss is larger, and dynamically, static characteristic is relatively poor, is subject to easily the electromagnetic interference of external environment condition, stability is bad, is difficult to satisfy the demand of welding profession development.Often adopt large welding condition during submerged-arc welding, the sweating heat input is increased, cause the metallographic structure of welding point thick, the impact flexibility of weld metal is not good enough, thereby causes welding joint mechanical property to descend.Therefore, the contradiction of quality and efficient becomes problem anxious to be resolved.
Pulse control technique is widely used in TIG welding and MIG welding, compare with the welding method of no pulse electric current, under the hot initial conditions of same weld, the welding method Resistance of Weld Metal tissue with pulse current has some improvement, and the mechanical property of weld metal increases; The cyclically-varying of pulse current makes the molten bath be subject to regular stirring and vibration, thus refinement crystal grain, improved the mechanical property of weld metal; Pulsed arc power can make fusion penetration increase, the increase of molten bath volume, penetration ratio increase to impact, vibration, the stirring action in molten bath.
Defective of the prior art mainly contains following aspect:
(1), mainly pursues high efficiency by raising speed of welding or raising deposition efficiency during welding is produced.In submerged-arc welding process, for satisfying generally increase of weld current when improving speed of welding of fusion penetration requirement, but the increase of electric current can cause the obvious increase of arc force.The problem that occurs easily in this case mainly contains: the ⑴ undercut; ⑵ " hump " welding bead; ⑶ welding bead is gloss not, easily forms overlap; ⑷ the HAZ grain growth of welding point, low-temperature flexibility are difficult to guarantee.
(2), existing technology has the method for use electromagnetic viscosimeter to make grain refinement, a hertz oscilltor is installed at head position at submerged arc welding machine, parameter by the control hertz oscilltor, make welding point, molten bath be subject to controlled electromagnetic viscosimeter, reach crystal grain thinning, the purpose of welding joint mechanical property is provided.But this method shortcoming is that installing space is narrow and small, and condition of work is abominable, and complicated operation be not easy to control, and cost is higher.
Summary of the invention
In order to solve the technical problem that exists in the prior art, the utility model provides a kind of arc voltage trace pulse submerged arc control circuit.
The utility model also provides a kind of welding machine that uses arc voltage trace pulse submerged arc control circuit.
The technical scheme that the prior art problem that solves the utility model adopts is, a kind of arc voltage trace pulse submerged arc control circuit is provided, described control circuit comprises: voltage given unit, frequency adjustment unit, arc voltage tracking cell, peak value base value regulon and inverter unit, wherein, described voltage given unit be connected the arc voltage tracking cell and be connected with described frequency adjustment unit respectively, described frequency adjustment unit and described peak value base value regulon be connected inverter unit and be connected successively.
In optimal technical scheme of the present utility model: described voltage given unit is the voltage given circuit, comprise: potentiometer RT1, capacitor C 2 and amplifier U1A, when the welding machine output cable longer, when pressure drop is larger on the cable, regulate described potentiometer RT1 and change reference voltage signal, current impulse is superposeed in advance.
In optimal technical scheme of the present utility model: described frequency adjustment unit is frequency adjustment circuit, comprising: resistance R 1, R3, potentiometer RT2, amplifier U1C, capacitor C 2 and diode D1.
In optimal technical scheme of the present utility model: described arc voltage tracking cell is the arc voltage tracking circuit, comprise: resistance R 2, R9, R10, R11, capacitor C 4, C5, amplifier U2, amplifier U1B, optocoupler U3, potentiometer RT5, luminous tube LED1, the arc voltage signal of described arc voltage tracking circuit sampling welding output carries out the signal isolation by described optocoupler U3.
In optimal technical scheme of the present utility model: described peak value base value regulon is peak value base value regulating circuit, comprise: potentiometer RT3, RT4, resistance R 4, R5, R7, R8, R12, diode D2, D3 and amplifier U1D, regulate the background current of described potentiometer RT3 regulating impulse, regulate the peak point current of described potentiometer RT4 regulating impulse, described potentiometer RT3 and RT4 pulse signals are carried out shaping, export peak value 5V-10V, a base value 1V-5V, the pulse signal that can regulate separately.
The utility model also provides a kind of welding machine, described welding machine comprises arc voltage trace pulse submerged arc control circuit, described arc voltage trace pulse submerged arc control circuit further comprises: voltage given unit, frequency adjustment unit, arc voltage tracking cell, peak value base value regulon and inverter unit, wherein, described voltage given unit be connected the arc voltage tracking cell and be connected with described frequency adjustment unit respectively, described frequency adjustment unit and described peak value base value regulon be connected inverter unit and be connected successively.
The utility model advantage is: after one, adopting technical solutions of the utility model, can effectively control heat input, in lower horizontal situation, improve fusion penetration at total average welding current, the common deficiencies such as first weld seam when welding root lack of fusion be can effectively eliminate, weldquality and welding efficiency improved.
Two, the utility model uses less bevel for welding or does not open cut, field of welding temperature and electric arc force distribution have well been improved when having reduced the required deposited amount of structure, significantly improved speed of welding, obviously improved appearance of weld. effectively improved the thermal efficiency of electric arc, under the prerequisite of identical deposition rate, effectively reduce hot input, can under the prerequisite that satisfies the welding quality requirement, improve speed of welding.
Three, the utility model submerged arc welding electric power output current is pulsed output, realizes pulse submerged-arc welding.It is characterized in that pulse current parameter (peak point current, background current, pulse frequency, dutycycle) can regulate respectively, can obtain needed waveform and effectively control the input heat, improved the situation of being heated of weld seam and heat affected area.Because the pulse welding electric current can directly produce electromagnetic viscosimeter, has strengthened the stirring action to the molten bath, has obtained the effect of crystal grain thinning, so that the comprehensive mechanical property of welding point (particularly impact flexibility) is improved.
Four, the utility model control circuit is simple, and implementation cost is lower, and manufacturing process is simple, and dependable performance does not hinder the normal welding operation, meets the principle of low cost, automation.
Five, the utility model is through test weld, verified that this system has good external characteristics output and appearance of weld attractive in appearance, debugging changes frequency, the dutycycle of output pulse current and peak value and the base value of adjusting direct current, can in sizable scope, control deposition rate and depth of penetration, speed of welding and welding efficiency have been improved, crystal grain thinning improves weldquality.The utility model is when work, and the output welding current is a pulse current, plays the total usefulness that increases fusion penetration, is particularly suitable for requiring fusion penetration large, the occasion that actual current is less.
Description of drawings
Fig. 1. the utility model arc voltage trace pulse submerged arc control circuit modular structure figure.
Fig. 2. the voltage given circuit part schematic diagram in the utility model.
Fig. 3. the frequency adjustment circuit part schematic diagram in the utility model.
Fig. 4. the arc voltage tracking circuit part schematic diagram in the utility model.
Fig. 5. the peak value base value regulating circuit part schematic diagram in the utility model.
The specific embodiment
Below in conjunction with accompanying drawing technical solutions of the utility model are elaborated:
Determine that at first the utility model relates to the submerged-arc welding of a kind of arc voltage trace pulse, belongs to the submerged arc welding equipment technical field.
The utility model provides a kind of arc voltage trace pulse submerged-arc welding control method, and described arc voltage trace pulse submerged-arc welding control method adopts arc voltage tracking mode sampling and outputting voltage, realizes the control of paired pulses electric current according to the variation of arc voltage.
In the technical solution of the utility model: described arc voltage trace pulse submerged-arc welding control method comprises step: A: the reference voltage signal of output pulse current stack and the arc voltage signal of output are compared, according to the first pulse signal of a height variation of comparative result output; B: described the first pulse signal is carried out shaping, export second pulse signal that to regulate separately; C: make the second pulse signal enter inverter and be connected with the welding current control section of inverter, realize the pulsed output of welding current, make the frequency of pulse current, peak value, base value can be regulated separately, and the dutycycle of pulse current is regulated by regulating wire feed rate.
In the technical solution of the utility model, described arc voltage trace pulse submerged-arc welding control method specifically comprises step:
A11: the reference voltage signal by the 101 output pulse current stacks of voltage given unit enters frequency adjustment unit 102;
A12: the arc voltage signal by the 103 sampling welding machine outputs of arc voltage tracking cell also enters frequency adjustment unit 102, and reference voltage signal and arc voltage signal compare through frequency adjustment unit 102;
A13: when the arc voltage of welding machine output is lower than reference voltage, frequency adjustment unit 102 output high level; When the arc voltage of welding machine output is higher than reference voltage, frequency adjustment unit 102 output low levels, when the arc voltage of welding machine output when height changes, the first pulse signal that frequency adjustment unit height of 102 outputs changes, the frequency of the first pulse signal can be regulated by frequency adjustment unit 102;
B2: the first pulse signal of frequency adjustment unit 102 outputs enters peak value base value regulon 104, carry out shaping by peak point current regulator potentiometer in the peak value base value regulon 104 and background current regulator potentiometer pulse signals, export second pulse signal that peak value 5V-10V, base value 1V-5V can regulate separately;
C1: the second pulse signal of peak value base value regulon 104 outputs enters inverter unit 105, be connected with the welding current control section of inverter, realize the pulsed output of welding current, the frequency of pulse current, peak value, base value are regulated separately, and the dutycycle of pulse current is regulated by the wire feed rate of regulating submerged arc welding carriage.
Below see also Fig. 1 the utility model arc voltage trace pulse submerged arc control circuit modular structure figure.As shown in FIG., the reference voltage signal of voltage given unit 101 output pulse current stacks enters frequency adjustment unit 102, the arc voltage signal of arc voltage tracking cell 103 sampling welding machine outputs also enters frequency adjustment unit 102, reference voltage signal and arc voltage signal compare through frequency adjustment unit 102, when the arc voltage of welding machine output is lower than reference voltage, frequency adjustment unit 102 output high level; When the arc voltage of welding machine output is higher than reference voltage, frequency adjustment unit 102 output low levels; Like this, when the arc voltage of welding machine output when height changes, the pulse signal of a height variation just can be exported in frequency adjustment unit 102, the frequency of pulse signal can be regulated by frequency adjustment unit 102;
The pulse signal of frequency adjustment unit 102 outputs enters peak value base value regulon 104, carry out shaping by peak point current regulator potentiometer in the peak value base value regulon 104 and background current regulator potentiometer pulse signals, export a pulse signal that peak value 5V-10V, base value 1V-5V can regulate separately;
The pulse signal of peak value base value regulon 104 outputs enters inverter unit 105(inverter), be connected with the welding current control section of inverter, realize the pulsed output of welding current, the frequency of pulse current, peak value, base value can be regulated separately, and the dutycycle of pulse current can be regulated by the wire feed rate of regulating submerged arc welding carriage.In a word, the submerged-arc welding of this arc voltage trace pulse can be exported a frequency, the pulse current that peak value, base value and dutycycle can be regulated separately.
In technical solutions of the utility model, described voltage given unit 101 is that voltage given circuit, described frequency adjustment unit 102 are peak value base value regulating circuit for frequency adjustment circuit, described arc voltage tracking cell 103 for arc voltage tracking circuit, described peak value base value regulon 104.
In the utility model, described arc voltage trace pulse submerged arc control circuit schematic diagram can be consulted Fig. 2 to Fig. 5, and coupling together Fig. 2 to Fig. 5 in addition, inverter namely forms the arc voltage trace pulse submerged arc control circuit schematic diagram described in the utility model again.Below in conjunction with Fig. 2 to Fig. 5 operation principle of the present utility model is described.As shown in FIG., after the start, the reference voltage signal of voltage given circuit output pulse electric current stack enters frequency adjustment circuit, the voltage given circuit comprises potentiometer RT1, capacitor C 2 and amplifier U1A, potentiometer RT1 is by+15V Power supply, and potentiometer RT1, capacitor C 1 are connected with U1A-3 three, and amplifier U1A is single power supply, U1A-4 is connected with+15V power supply, capacitor C 2, and U1A-2 and U1A-1 are connected to form voltage follower; Potentiometer RT1 exports an adjustable voltage signal, enters amplifier U1A-3 through capacitor C 1, and amplifier U1A-1 output voltage signal enters frequency adjustment circuit; Longer when the welding machine output cable, when pressure drop is larger on the cable, can suitably regulates RT1 and change reference voltage signal, so that current impulse superposes in advance, weld more stable.
The arc voltage tracking circuit comprises resistance R 2, R9～R11, capacitor C 4, C5, amplifier U2, amplifier U1B, optocoupler U3, potentiometer RT5, luminous tube LED1, when welding machine is worked, the arc voltage signal of arc voltage tracking circuit sampling welding output is undertaken entering frequency adjustment circuit after the signal isolation by optocoupler U3; Resistance R 9, capacitor C 4 and amplifier U2-3 are connected, and the arc voltage signal enters amplifier U2-3 through resistance R 9, capacitor C 4; Amplifier U2-6 is connected with capacitor C 5, optocoupler U3-2, the arc voltage signal enters optocoupler, amplifier U2-4, U2-2, potentiometer RT5, resistance R 11, optocoupler U3-3, U3-4 are connected to form voltage feedback loop, adjust the precision of arc voltage signal, the arc voltage signal enters optocoupler U3 and carries out the signal isolation, optocoupler U3-5 output is through the arc voltage signal of isolation, this signal enters voltage follower U1B through resistance R 2, optocoupler U3-5, resistance R 2, amplifier U1B-5 are connected, and voltage follower U1B-7 exports treated arc voltage signal and enters frequency adjustment circuit by resistance R 3.
Frequency adjustment circuit comprises resistance R 1, R3, potentiometer RT2, amplifier U1C, capacitor C 2 and diode D1; Resistance R 1, potentiometer RT2 are connected with U1C-10 three, and potentiometer RT2 one end is connected with diode D1 negative terminal, and diode D1 anode links to each other with U1C-8, and resistance R 3, C2 and U1C-9 three are connected; Reference voltage signal enters frequency adjustment circuit through resistance R 1, the arc voltage signal enters frequency adjustment circuit through resistance R 3, reference voltage signal and arc voltage signal compare through frequency adjustment circuit, when the arc voltage of welding machine output is lower than reference voltage, and frequency adjustment circuit output high level; When the arc voltage of welding machine output is higher than reference voltage, the frequency adjustment circuit output low level; Like this, when the arc voltage of welding machine output when height changes, frequency adjustment circuit just can be exported the pulse signal of a height variation, the frequency of pulse signal can be regulated by potentiometer RT2.
The pulse signal of frequency adjustment circuit output enters peak value base value regulating circuit by resistance R 4, and peak value base value regulating circuit comprises potentiometer RT3, RT4, resistance R 4, R5, R7, R8, R12, diode D2, voltage-stabiliser tube D3, amplifier U1D.Resistance R 4 is connected with resistance R 5, capacitor C 3, potentiometer RT4, U1D-12, after linking to each other with capacitor C 3 other ends, the other end of resistance R 5 links to each other with power supply ground, the potentiometer RT4 other end is connected with voltage-stabiliser tube D3, amplifier U1D-14 output pulse signal enters inverter by diode D2 and resistance R 7, resistance R 7 is connected with resistance R 8, and current feedback signal enters inverter through resistance R 8; Regulator potentiometer RT3 can regulating impulse background current, regulator potentiometer RT4 can regulating impulse peak point current, carry out shaping by potentiometer RT3 and RT4 pulse signals, export a pulse signal that peak value 5V-10V, base value 1V-5V can regulate separately.
Pulse signal and the current feedback signal of the output of peak value base value regulating circuit enter inverter simultaneously, be connected with the welding current control section of inverter, realize the pulsed output of welding current, the frequency of pulse current, peak value, base value can be regulated separately, and the dutycycle of pulse current can be regulated by the wire feed rate of regulating submerged arc welding carriage.In a word, the submerged-arc welding of this arc voltage trace pulse can be exported a frequency, the pulse current that peak value, base value and dutycycle can be regulated separately.
Technical solutions of the utility model provide a kind of brand-new pulse submerged-arc welding---arc voltage trace pulse submerged-arc welding.Submerged arc welding machine is when work, the output of the arc voltage control impuls electric current of exporting by sampling, realize that pulse current changes with arc voltage, reach the purpose of following the tracks of arc voltage, can effectively control heat input like this, in lower horizontal situation, improve fusion penetration at total average welding current, can effectively eliminate the common deficiencies such as first weld seam when welding root lack of fusion, improve weldquality and welding efficiency;
The utility model is using less bevel for welding or is not opening cut, field of welding temperature and electric arc force distribution have well been improved when having reduced the required deposited amount of structure, significantly improved speed of welding, obviously improved appearance of weld. effectively improved the thermal efficiency of electric arc, under the prerequisite of identical deposition rate, effectively reduce hot input, can under the prerequisite that satisfies the welding quality requirement, improve speed of welding.
The utility model submerged arc welding electric power output current is pulsed output, realizes pulse submerged-arc welding.It is characterized in that pulse current parameter (peak point current, background current, pulse frequency, dutycycle) can regulate respectively, can obtain needed waveform and effectively control the input heat, improved the situation of being heated of weld seam and heat affected area.Because the pulse welding electric current can directly produce electromagnetic viscosimeter, has strengthened the stirring action to the molten bath, has obtained the effect of crystal grain thinning, so that the comprehensive mechanical property of welding point (particularly impact flexibility) is improved.
The utility model control circuit is simple, and implementation cost is lower, and manufacturing process is simple, and dependable performance does not hinder the normal welding operation, meets the principle of low cost, automation.
Through test weld, verified and the utlity model has good external characteristics output and appearance of weld attractive in appearance, debugging changes frequency, the dutycycle of output pulse current and peak value and the base value of adjusting direct current, can in sizable scope, control deposition rate and depth of penetration, speed of welding and welding efficiency have been improved, crystal grain thinning improves weldquality.After adopting technical solutions of the utility model, welding machine is when work, and the output welding current is a pulse current, plays the total usefulness that increases fusion penetration, is particularly suitable for requiring fusion penetration large, the occasion that actual current is less;
In technical solutions of the utility model, the pulse current parameter of the arc voltage trace pulse submerged-arc welding output of design is: background current is 300A～600A, peak point current is 1000A～1500A, dutycycle is 20%～50%, pulse frequency is 15 Hz～200Hz, and speed of welding is 500 m/min～1200m/min.
The arc voltage trace pulse control circuit of the utility model design can be used for the inversion direct current submerged-arc welding machine, also can be used for DC inverted tig welder, inversion direct current CO2 gas shielded welding machine, inversion direct current air plasma cutter and other welding and cutting device.
Above content is in conjunction with concrete optimal technical scheme further detailed description of the utility model, can not assert that implementation of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, can also make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.
Claims (7)
1. arc voltage trace pulse submerged arc control circuit, it is characterized in that: described control circuit comprises: voltage given unit (101), frequency adjustment unit (102), arc voltage tracking cell (103), peak value base value regulon (104) and inverter unit (105), wherein, described voltage given unit (101) be connected arc voltage tracking cell (103) and be connected with described frequency adjustment unit (102) respectively, described frequency adjustment unit (102) and described peak value base value regulon (104) be connected inverter unit (105) and be connected successively.
2. described control circuit according to claim 1, it is characterized in that: described voltage given unit (101) is the voltage given circuit, comprise: potentiometer RT1, capacitor C 2 and amplifier U1A, described potentiometer RT1 is by+15V Power supply, potentiometer RT1, capacitor C 1 are connected with U1A-3 three, amplifier U1A is single power supply, and U1A-4 is connected with+15V power supply, capacitor C 2, and U1A-2 and U1A-1 are connected to form voltage follower.
3. described control circuit according to claim 1, it is characterized in that: described frequency adjustment unit (102) is frequency adjustment circuit, comprising: resistance R 1, R3, potentiometer RT2, amplifier U1C, capacitor C 2 and diode D1.
4. described control circuit according to claim 1, it is characterized in that: described arc voltage tracking cell (103) is the arc voltage tracking circuit, comprise: resistance R 2, R9, R10, R11, capacitor C 4, C5, amplifier U2, amplifier U1B, optocoupler U3, potentiometer RT5, luminous tube LED1, the arc voltage signal of described arc voltage tracking circuit sampling welding output carries out the signal isolation by described optocoupler U3.
5. described control circuit according to claim 1, it is characterized in that: described peak value base value regulon (104) is peak value base value regulating circuit, comprise: potentiometer RT3, RT4, resistance R 4, R5, R7, R8, R12, diode D2, D3 and amplifier U1D, regulate the background current of described potentiometer RT3 regulating impulse, regulate the peak point current of described potentiometer RT4 regulating impulse, described potentiometer RT3 and RT4 pulse signals are carried out shaping, export peak value 5V-10V, a base value 1V-5V, the pulse signal that can regulate separately.
6. one kind is equipped with the as claimed in claim 1 welding machine of control circuit, it is characterized in that: described welding machine comprises arc voltage trace pulse submerged arc control circuit, described arc voltage trace pulse submerged arc control circuit further comprises: voltage given unit (101), frequency adjustment unit (102), arc voltage tracking cell (103), peak value base value regulon (104) and inverter unit (105), wherein, described voltage given unit (101) be connected arc voltage tracking cell (103) and be connected with described frequency adjustment unit (102) respectively, described frequency adjustment unit (102) and described peak value base value regulon (104) be connected inverter unit (105) and be connected successively.
7. described welding machine according to claim 6, it is characterized in that: the background current that adopts in the described welding machine is 300A～600A, and peak point current is 1000A～1500A, and dutycycle is 20%～50%, pulse frequency is 15 Hz～200Hz, and speed of welding is 500 m/min～1200m/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012203838360U CN202804445U (en) | 2012-08-04 | 2012-08-04 | Arc voltage tacking pulse submerged arc welding control circuit and welding machine |
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| CN2012203838360U CN202804445U (en) | 2012-08-04 | 2012-08-04 | Arc voltage tacking pulse submerged arc welding control circuit and welding machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106670624A (en) * | 2016-12-29 | 2017-05-17 | 上海沪临重工有限公司 | Submerged arc welding control method and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106670624A (en) * | 2016-12-29 | 2017-05-17 | 上海沪临重工有限公司 | Submerged arc welding control method and device |
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