CN205342168U - A current waveform control circuit for exchanging argon arc welding machine - Google Patents
A current waveform control circuit for exchanging argon arc welding machine Download PDFInfo
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- CN205342168U CN205342168U CN201620028057.7U CN201620028057U CN205342168U CN 205342168 U CN205342168 U CN 205342168U CN 201620028057 U CN201620028057 U CN 201620028057U CN 205342168 U CN205342168 U CN 205342168U
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Abstract
The utility model discloses a current waveform control circuit for exchanging argon arc welding machine for adjust the positive and negative amplitude of the square wave of this welding machine respectively, its characterized in that, this current waveform control circuit includes: a triangular wave generating circuit for produce a triangular wave, a chopper circuit, this chopper circuit connects this triangular wave generating circuit's output for export duty cycle adjustable square wave, a delay circuit, this delay circuit connects this chopper circuit's output for produce two tunnel complemental square wave drive signal, a differentiating circuit, this differentiating circuit connect this chopper circuit's output, generate signal P1 and P2, a rising edge and falling edge detection circuitry, this rising edge and falling edge detection circuitry are according to this signal P1 and this square wave of P2 judgement drive signal's rising edge and falling edge, the preset selection circuit of an electric current, the preset selection circuit of this electric current is according to this square wave drive signal and this square wave drive signal's rising edge and falling edge output positive wave output control signal and negative wave output control signal.
Description
Technical field
This utility model relates to a kind of solder technology equipment, particularly relates to a kind of waveform control circuit for alternating-current argon arc welder.
Background technology
The polarity of alternating current is periodically to convert, and being equivalent to half-wave in each cycle is straight polarity direct current, and half-wave is DC reverse connection.During the half-wave just connect, tungsten electrode can launch enough electronics to melt workpiece and to be unlikely overheated, stablizing of favourable sub-electric arc.The oxide-film that during the half-wave of reversal connection, surface of the work generates is easy to be cleaned out and obtains that surface-brightening is attractive in appearance, shape good weld seam.So, alternating-current argon arc welder has taken into account cleaning action of the cathode and tungsten electrode scaling loss is few, arc stability is good effect simultaneously, generally all selects ac argon arc weld for the metals such as the strong aluminum of activity, magnesium, aluminium bronze and alloy thereof.It is simply that the alternating-current argon arc welder that prior art uses, it is that the dutycycle by regulating AC wave shape is to regulate weld strength and cleaning effect.
But prior art there is also certain limitation, when wanting to reach strong cleaning effect, when namely dutycycle reduces, it is meant that weld strength reduces, and speed of welding slows down.Otherwise, when wanting fast speed of welding, cleaning effect is likely to just undesirable.
As can be seen here, prior art is badly in need of want a kind of new AC wave shape control circuit, it is possible to individually regulate the positive and negative amplitude of AC wave shape.So not only can obtain strong cleaning effect, and can ensure that speed of welding and intensity.
Utility model content
The purpose of this utility model is in that to provide a kind of waveform control circuit for alternating-current argon arc welder, it is possible to individually regulate the positive and negative amplitude of AC wave shape.
In order to realize above-mentioned utility model purpose, this utility model discloses a kind of waveform control circuit for alternating-current argon arc welder, for regulating the positive and negative amplitude of the square wave of this welding machine respectively, it is characterised in that, this waveform control circuit includes: a triangle wave generating circuit, is used for producing a triangular wave；One chopper circuit, this chopper circuit connects the outfan of this triangle wave generating circuit, is used for exporting an adjustable square wave of output duty cycle；One delay circuit, this delay circuit connects the outfan of this chopper circuit, the square wave driving signal complementary for producing two-way；One peaker, this peaker connects the outfan of this chopper circuit, generates signal P1 and P2；One rising edge and trailing edge testing circuit, this rising edge and trailing edge testing circuit judge rising edge and the trailing edge of this square wave driving signal according to this signal P1 and P2；One given value of current selection circuit, this given value of current selection circuit exports a positive wave output control signal and negative wave output control signal according to rising edge and the trailing edge of this square wave driving signal and this square wave driving signal.
Further, this waveform control circuit also includes a current foldback circuit, and this current foldback circuit is connected with the outfan of this delay circuit, and when stream occurred in this alternating-current argon arc welder, this square wave driving signal is lockable.
Further, this triangle wave generating circuit includes operational amplifier U3B, U3C, electric capacity C23, electricity
Resistance R34, R32, R33 and stabilivolt ZD2, ZD3, the positive input terminal ground connection of this operational amplifier U3B, negative input end connects this resistance R34, electric capacity C23, outfan is connected with stabilivolt ZD2 and this chopper circuit, one end of this stabilivolt ZD3 connects stabilivolt ZD2, the other end connects the positive input terminal of this operational amplifier U3C, and the positive input terminal of this operational amplifier U3C is connected with its outfan through resistance R32, R33, the negative input end ground connection of this operational amplifier U3C.
Further, this chopper circuit includes resistance R37, R38, R51, variable resistance R2, operational amplifier U3A, phase inverter U4A, U4B, diode D7 and electric capacity C3, this variable resistance R2 is for inputting the cleaning effect of this alternating-current argon arc welder, the adjustable side of this variable resistance R2 connects resistance R37, one end of this electric capacity C24 connects the positive input terminal of resistance R37 and this operational amplifier U3A, the other end ground connection of this electric capacity C24, the negative input end of this operational amplifier U3A connects this triangle wave generating circuit, its outfan connects resistance R38, the other end of this resistance R38 connects diode D7 and phase inverter U4A, the other end ground connection of diode D7, the outfan of phase inverter U4A connects this peaker and delay circuit.
Further, this peaker includes electric capacity C37, C29 and resistance R54, R45, and the outfan of this electric capacity C37 is connected with resistance R54, exports signal P1；The outfan of this electric capacity C29 is connected with resistance R45, exports signal P2.
Further, this delay circuit includes phase inverter U4C, U4D, U4F, diode D8, D9, resistance R32, R33, R39, R40, electric capacity C25, C26, the outfan of this phase inverter U4F connects diode D8, resistance R39, and the outfan of this diode D8 and resistance R39 connects electric capacity C26 and phase inverter U4D, and this phase inverter U4D exports a road square wave driving signal；The outfan of this diode D9 and resistance R40 connects electric capacity C25 and phase inverter U4C, this phase inverter U4C and exports the square wave driving signal that another road signal is complementary.
Further, this rising edge and trailing edge testing circuit include electric capacity C40, C38, C30, resistance R48, R49, R5, R43, and diode D15, D16, the input of this electric capacity C40 connects the outfan of delay circuit, the outfan of electric capacity C40 connects resistance R48, diode D15, the outfan of resistance R48 and diode D15 connects this given value of current selection circuit, the input of this electric capacity C38 connects the outfan of delay circuit, the outfan of electric capacity C38 connects resistance R49, diode D16, the outfan of resistance R49 and diode D16 connects this given value of current selection circuit, the outfan of resistance R48 connects electric capacity C30, one end of resistance R43 connects the power supply other end and connects this given value of current selection circuit, resistance R48, R49, R54, electric capacity C30 ground connection.
Further, this given value of current selection circuit includes monostable flipflop U5A and bilateral analog switch U1A and U1C, this monostable flipflop U5A connects this delay circuit and the outfan of this rising edge and trailing edge testing circuit, two outfans of this monostable flipflop U5A connect bilateral analog switch U1A and bilateral analog switch U1C respectively, this bilateral analog switch U1A exports a positive wave, and this bilateral analog switch U1C exports a negative wave.
Further, this current foldback circuit includes a phase inverter U4E.
Compared with prior art, the waveform control circuit of alternating-current argon arc welder provided by the utility model, the output amplitude that the positive and negative amplitude that can individually regulate AC wave shape makes exchange negative strengthens, such cleaning effect strengthens, dutycycle can be increased simultaneously, the output energy making exchange positive is more, improves speed of welding.Because the weld interval that exchange is born reduces the tungsten pin that can also adequately protect.
Accompanying drawing explanation
Can be further understood by following utility model detailed description and institute's accompanying drawings with spirit about advantage of the present utility model.
Fig. 1 is the AC wave shape schematic diagram of the alternating-current argon arc welder of prior art；
Fig. 2 is the AC wave shape schematic diagram of the alternating-current argon arc welder that this utility model relates to；
Fig. 3 is the module map of the waveform control circuit for alternating-current argon arc welder that this utility model relates to；
Fig. 4-7 is the physical circuit figure of the waveform control circuit for alternating-current argon arc welder that this utility model relates to；
Fig. 8 and 9 are the technique effect schematic diagrams of the waveform control circuit for alternating-current argon arc welder that this utility model relates to.
Mainly illustrate
10-triangle wave generating circuit 20-chopper circuit
30-current foldback circuit 40-delay circuit
50-peaker 60-rising edge trailing edge testing circuit
70-given value of current selection circuit.
Detailed description of the invention
Specific embodiment of the utility model is described in detail below in conjunction with accompanying drawing.
The waveform of the alternating-current argon arc welder of prior art as it is shown in figure 1, in Fig. 1 IP be positive wave, IN is negative wave, and positive wave is consistent with frequency with the amplitude of negative wave, and positive wave and negative wave can not regulate respectively.
Principle of the present utility model is the cleaning effect utilizing an adjustable resistance to input setting, the dutycycle of square wave is selected according to this cleaning effect, square wave driving signal according to each drive waveforms rising edge and trailing edge and two-way complementation selects different electric currents to export, thus reaching the purpose that the positive negative output current of alternating-current argon arc welder is different.The output amplitude making exchange negative strengthens, and such cleaning effect strengthens, and can increase dutycycle simultaneously, and the output energy making exchange positive is more, improves speed of welding.The input waveform finally realized for the waveform control circuit of alternating-current argon arc welder provided by the utility model as in figure 2 it is shown, in Fig. 2 IP represent that output electric current is the current value of timing, IN represents current value when output electric current is negative.In Fig. 2, the time of IN is shorter than IP, but the amplitude of IN is more than IP, thus can the energy of positive current of alternating-current argon arc welder output more, improve speed of welding, the output amplitude making exchange negative strengthens time reduction, and such cleaning effect strengthens, and can increase dutycycle simultaneously.
Fig. 3 is the module map of the waveform control circuit for alternating-current argon arc welder that this utility model relates to.As it is shown on figure 3, this waveform control circuit being used for alternating-current argon arc welder includes: triangle wave generating circuit 10, it is used for producing triangular wave；Chopper circuit 20, this chopper circuit 20 connects the outfan of this triangle wave generating circuit 10, is used for exporting an adjustable square wave of output duty cycle；Delay circuit 40, this delay circuit 40 connects the outfan of this chopper circuit 20, the square wave driving signal complementary for producing two-way；Peaker 50, this peaker 50 connects the outfan of this chopper circuit 20, generates signal P1 and P2；One rising edge and trailing edge testing circuit 60, this rising edge and trailing edge testing circuit 60 judge rising edge and the trailing edge of this square wave driving signal according to this signal P1 and P2；One given value of current selection circuit 70, this given value of current selection circuit 70 exports a positive wave output control signal and negative wave output control signal according to rising edge and the trailing edge of this square wave driving signal and this square wave driving signal.This waveform control circuit also includes a current foldback circuit 30, and this current foldback circuit 30 is connected with the outfan of this delay circuit 40, and when stream occurred in this alternating-current argon arc welder, this square wave driving signal is lockable.
Below with reference to Fig. 4 to Fig. 7, the physical circuit figure for alternating-current argon arc welder that this utility model relates to being described, wherein Fig. 4 is the physical circuit figure of triangle wave generating circuit and chopper circuit；Fig. 5 is the physical circuit figure of peaker and delay circuit；Fig. 6 is the physical circuit figure of the given selection circuit of rising edge and trailing edge testing circuit and portion of electrical current；Fig. 7 is the physical circuit figure of the given selection circuit of portion of electrical current.
First triangle wave generating circuit produces triangular wave, and adjustable resistance is the potentiometer that cleaning effect regulates, and is selected the dutycycle of square wave by operational amplifier copped wave.The Dead Time of two-way drive circuit is regulated by the resistor capacitor diode in delay circuit, drive waveforms for one group of IGBT, being the RC charging interval by R39 and C26 regulate the IGBT delay time opened when opening, shutoff is to regulate the shutoff delay time of IGBT by the D8 electric discharge electricity time.Therefore open delay time more than turning off delay time, so can effectively prevent IGBT from leading directly to.Overcurrent protection was exactly when there being stream alarm signal, and when namely SP point is for 5V, after phase inverter, U4E is output as 0V, has namely locked the driving pulse of IGBT.Monostable flipflop judges each drive waveforms rising edge and trailing edge according to signal P1 and the P2 of peaker, then reversely exports respectively through Q and Q/ two-way and selects different electric currents to export, reaches the purpose that the positive negative output current of alternating-current argon arc welder is different.
This triangle wave generating circuit includes operational amplifier U3B, U3C, electric capacity C23, resistance R34, R32,
R33 and stabilivolt ZD2, ZD3, the positive input terminal ground connection of this operational amplifier U3B, negative input end connects this resistance R34, electric capacity C23, outfan is connected with stabilivolt ZD2 and this chopper circuit, one end of this stabilivolt ZD3 connects stabilivolt ZD2, the other end connects the positive input terminal of this operational amplifier U3C, and the positive input terminal of this operational amplifier U3C is connected with its outfan through resistance R32, R33, the negative input end ground connection of this operational amplifier U3C.
This chopper circuit includes resistance R37, R38, R51, variable resistance R2, operational amplifier U3A, phase inverter U4A, U4B, diode D7 and electric capacity C3, this variable resistance R2 is for inputting the cleaning effect of this alternating-current argon arc welder, the adjustable side of this variable resistance R2 connects resistance R37, one end of this electric capacity C24 connects the positive input terminal of resistance R37 and this operational amplifier U3A, the other end ground connection of this electric capacity C24, the negative input end of this operational amplifier U3A connects this triangle wave generating circuit, its outfan connects resistance R38, the other end of this resistance R38 connects diode D7 and phase inverter U4A, the other end ground connection of diode D7, the outfan of phase inverter U4A connects this peaker and delay circuit.
This peaker includes electric capacity C37, C29 and resistance R54, R45, and the outfan of this electric capacity C37 is connected with resistance R54, exports signal P1；The outfan of this electric capacity C29 is connected with resistance R45, exports signal P2.
Driving square wave through high accuracy delay line, wherein a road is to have passed through two reversers, and a road is through a phase inverter, therefore the square wave driving signal of the two-way complementation produced is used for driving AC module.When stream occurs in welding machine, SP signal was 5V, and the alternating current drive signal now exported will be lockable.During welding machine normal operation, SP signal is 0V, collectively forms two-way with two-way pulse and drives signal.This delay circuit includes phase inverter U4C, U4D, U4F, diode D8, D9, resistance R32, R33, R39, R40, electric capacity C25, C26, the outfan of this phase inverter U4F connects diode D8, resistance R39, the outfan of this diode D8 and resistance R39 connects electric capacity C26 and phase inverter U4D, and this phase inverter U4D exports a road square wave driving signal；The outfan of this diode D9 and resistance R40 connects electric capacity C25 and phase inverter U4C, this phase inverter U4C and exports the square wave driving signal that another road signal is complementary.
This rising edge and trailing edge testing circuit include electric capacity C40, C38, C30, resistance R48, R49, R5, R43, and diode D15, D16, the input of this electric capacity C40 connects the outfan of delay circuit, the outfan of electric capacity C40 connects resistance R48, diode D15, the outfan of resistance R48 and diode D15 connects this given value of current selection circuit, the input of this electric capacity C38 connects the outfan of delay circuit, the outfan of electric capacity C38 connects resistance R49, diode D16, the outfan of resistance R49 and diode D16 connects this given value of current selection circuit, the outfan of resistance R48 connects electric capacity C30, one end of resistance R43 connects power supply, the other end connects this given value of current selection circuit, resistance R48, R49, R54, electric capacity C30 ground connection.ACOUT is two-way exchange drive waveforms output interface.
This given value of current selection circuit includes monostable flipflop U5A and bilateral analog switch U1A and U1C, this monostable flipflop U5A connects this delay circuit and the outfan of this rising edge and trailing edge testing circuit, two outfans of this monostable flipflop U5A connect bilateral analog switch U1A and bilateral analog switch U1C respectively, this bilateral analog switch U1A exports a positive wave, and this bilateral analog switch U1C exports a negative wave.
Monostable flipflop judges each drive waveforms rising edge and trailing edge according to signal P1 and the P2 of peaker, then different electric currents is selected to export respectively through P_input and N_input, when P_input is high level, simulated dual path analoging switch U1A turns on, the given output of IP, when N_input is high level, simulated dual path analoging switch U1C turns on, the given output of IN, thus reaching the purpose that the positive negative output current of alternating-current argon arc welder is different.The output amplitude making exchange negative strengthens, and such cleaning effect strengthens, and can increase dutycycle simultaneously, and the output energy making exchange positive is more, improves speed of welding.Because the weld interval that exchange is born reduces the tungsten pin that can also adequately protect.
The technique effect schematic diagram of the waveform control circuit for alternating-current argon arc welder provided by the utility model is as shown in FIG. 8 and 9, in Fig. 8 and 9, the square wave of top is alternating current drive signal, and the square wave of lower section is respectively to the detection waveform driving signal rising edge and trailing edge.
Simply preferred embodiment of the present utility model described in this specification, above example is only in order to illustrate the technical solution of the utility model but not to restriction of the present utility model.All those skilled in the art comply with design of the present utility model by the available technical scheme of logical analysis, reasoning, or a limited experiment, all should within scope of the present utility model.
Claims (9)
1. for a waveform control circuit for alternating-current argon arc welder, for regulating the positive and negative amplitude of the square wave of described welding machine respectively, it is characterised in that described waveform control circuit includes:
One triangle wave generating circuit, is used for producing a triangular wave；
One chopper circuit, described chopper circuit connects the outfan of described triangle wave generating circuit, is used for exporting an adjustable square wave of output duty cycle；
One delay circuit, described delay circuit connects the outfan of described chopper circuit, the square wave driving signal complementary for producing two-way；
One peaker, described peaker connects the outfan of described chopper circuit, generates signal P1 and P2；
One rising edge and trailing edge testing circuit, described rising edge and trailing edge testing circuit judge rising edge and the trailing edge of described square wave driving signal according to described signal P1 and P2；
One given value of current selection circuit, described given value of current selection circuit exports a positive wave output control signal and negative wave output control signal according to rising edge and the trailing edge of described square wave driving signal and described square wave driving signal.
2. waveform control circuit as claimed in claim 1; it is characterized in that, described waveform control circuit also includes a current foldback circuit, and described current foldback circuit is connected with the outfan of described delay circuit; when stream occurred in described alternating-current argon arc welder, described square wave driving signal is lockable.
3. waveform control circuit as claimed in claim 1, it is characterized in that, described triangle wave generating circuit includes operational amplifier U3B, U3C, electric capacity C23, resistance R34, R32, R33 and stabilivolt ZD2, ZD3, the positive input terminal ground connection of described operational amplifier U3B, negative input end connects described resistance R34, electric capacity C23, outfan is connected with stabilivolt ZD2 and described chopper circuit, one end of described stabilivolt ZD3 connects stabilivolt ZD2, the other end connects the positive input terminal of described operational amplifier U3C, the positive input terminal of described operational amplifier U3C is through resistance R32, R33 is connected with its outfan, the negative input end ground connection of described operational amplifier U3C.
4. waveform control circuit as claimed in claim 1, it is characterized in that, described chopper circuit includes resistance R37, R38, R51, variable resistance R2, operational amplifier U3A, phase inverter U4A, U4B, diode D7 and electric capacity C3, described variable resistance R2 is for inputting the cleaning effect of described alternating-current argon arc welder, the adjustable side of described variable resistance R2 connects resistance R37, one end of described electric capacity C24 connects the positive input terminal of resistance R37 and described operational amplifier U3A, the other end ground connection of described electric capacity C24, the negative input end of described operational amplifier U3A connects described triangle wave generating circuit, its outfan connects resistance R38, the other end of described resistance R38 connects diode D7 and phase inverter U4A, the other end ground connection of diode D7, the outfan of phase inverter U4A connects described peaker and delay circuit.
5. waveform control circuit as claimed in claim 1, it is characterised in that described peaker includes electric capacity C37, C29 and resistance R54, R45, and the outfan of described electric capacity C37 is connected with resistance R54, exports signal P1；The outfan of described electric capacity C29 is connected with resistance R45, exports signal P2.
6. waveform control circuit as claimed in claim 1, it is characterized in that, described delay circuit includes phase inverter U4C, U4D, U4F, diode D8, D9, resistance R32, R33, R39, R40, electric capacity C25, C26, the outfan of described phase inverter U4F connects diode D8, resistance R39, the outfan of described diode D8 and resistance R39 connects electric capacity C26 and phase inverter U4D, and described phase inverter U4D exports a road square wave driving signal；The outfan of described diode D9 and resistance R40 connects electric capacity C25 and phase inverter U4C, described phase inverter U4C and exports the square wave driving signal that another road signal is complementary.
7. waveform control circuit as claimed in claim 1, it is characterized in that, described rising edge and trailing edge testing circuit include electric capacity C40, C38, C30, resistance R48, R49, R5, R43, and diode D15, D16, the input of described electric capacity C40 connects the outfan of delay circuit, the outfan of electric capacity C40 connects resistance R48, diode D15, the outfan of resistance R48 and diode D15 connects described given value of current selection circuit, the input of described electric capacity C38 connects the outfan of delay circuit, the outfan of electric capacity C38 connects resistance R49, diode D16, the outfan of resistance R49 and diode D16 connects described given value of current selection circuit, the outfan of resistance R48 connects electric capacity C30, one end of resistance R43 connects the power supply other end and connects described given value of current selection circuit, resistance R48, R49, R54, electric capacity C30 ground connection.
8. waveform control circuit as claimed in claim 1, it is characterized in that, described given value of current selection circuit includes monostable flipflop U5A and bilateral analog switch U1A and U1C, described monostable flipflop U5A connects the outfan of described delay circuit and described rising edge and trailing edge testing circuit, two outfans of described monostable flipflop U5A connect bilateral analog switch U1A and bilateral analog switch U1C respectively, described bilateral analog switch U1A exports a positive wave, and described bilateral analog switch U1C exports a negative wave.
9. waveform control circuit as claimed in claim 2, it is characterised in that described current foldback circuit includes a phase inverter U4E.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620028057.7U CN205342168U (en) | 2016-01-13 | 2016-01-13 | A current waveform control circuit for exchanging argon arc welding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620028057.7U CN205342168U (en) | 2016-01-13 | 2016-01-13 | A current waveform control circuit for exchanging argon arc welding machine |
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| Publication Number | Publication Date |
|---|---|
| CN205342168U true CN205342168U (en) | 2016-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620028057.7U Withdrawn - After Issue CN205342168U (en) | 2016-01-13 | 2016-01-13 | A current waveform control circuit for exchanging argon arc welding machine |
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| Country | Link |
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| CN (1) | CN205342168U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105436667A (en) * | 2016-01-13 | 2016-03-30 | 上海威特力焊接设备制造股份有限公司 | Waveform control circuit for alternate current argon arc welding machine |
| CN110297788A (en) * | 2016-07-21 | 2019-10-01 | 华为技术有限公司 | Transmitting line receives circuit and serial signal transmission system |
| CN114378411A (en) * | 2022-02-14 | 2022-04-22 | 上海威特力焊接设备制造股份有限公司 | Novel alternating current argon arc welding machine |
-
2016
- 2016-01-13 CN CN201620028057.7U patent/CN205342168U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105436667A (en) * | 2016-01-13 | 2016-03-30 | 上海威特力焊接设备制造股份有限公司 | Waveform control circuit for alternate current argon arc welding machine |
| CN105436667B (en) * | 2016-01-13 | 2017-08-01 | 上海威特力焊接设备制造股份有限公司 | A kind of waveform control circuit for alternating-current argon arc welder |
| CN110297788A (en) * | 2016-07-21 | 2019-10-01 | 华为技术有限公司 | Transmitting line receives circuit and serial signal transmission system |
| CN110297788B (en) * | 2016-07-21 | 2024-03-01 | 华为技术有限公司 | Transmitting circuit, receiving circuit and serial signal transmission system |
| CN114378411A (en) * | 2022-02-14 | 2022-04-22 | 上海威特力焊接设备制造股份有限公司 | Novel alternating current argon arc welding machine |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160629 Effective date of abandoning: 20170801 |