CN110948088A - Auxiliary pilot arc circuit for manual welding machine - Google Patents
Auxiliary pilot arc circuit for manual welding machine Download PDFInfo
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- CN110948088A CN110948088A CN202010043426.0A CN202010043426A CN110948088A CN 110948088 A CN110948088 A CN 110948088A CN 202010043426 A CN202010043426 A CN 202010043426A CN 110948088 A CN110948088 A CN 110948088A
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- 238000003466 welding Methods 0.000 title claims abstract description 68
- 238000004804 winding Methods 0.000 claims abstract description 33
- 239000003990 capacitor Substances 0.000 claims description 42
- 238000010521 absorption reaction Methods 0.000 claims description 31
- 238000005070 sampling Methods 0.000 claims description 22
- 238000000034 method Methods 0.000 description 6
- 230000003071 parasitic effect Effects 0.000 description 4
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/06—Arrangements or circuits for starting the arc, e.g. by generating ignition voltage, or for stabilising the arc
- B23K9/073—Stabilising the arc
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Abstract
The invention discloses an auxiliary arc maintaining circuit for a manual welding machine, which comprises: the primary side of the pulse transformer comprises a first winding and a second winding, and the input end of the first winding is connected with an alternating current power supply; the power supply end of the power supply management chip is connected with the second winding on the primary side of the pulse transformer; the pilot arc current control circuit is respectively connected with the output end of the power management chip, the current sensing end and the output end of the primary side first winding of the pulse transformer; the pilot arc current output circuit is respectively connected with the secondary side of the pulse transformer and the output anode of the power circuit; and the voltage feedback circuit is respectively connected with the feedback voltage input end of the power management chip and the output cathode of the power circuit. The invention only needs to generate the low-power pilot arc current through the low-power electronic device, thereby greatly reducing the cost; and because of the low-power filter inductor, the main loop of the electric welding machine only needs to provide the inductor with small inductance, thereby reducing the cost of the main loop of the electric welding machine.
Description
Technical Field
The invention relates to a circuit of a manual welding electric welding machine, in particular to an auxiliary pilot arc circuit for the manual welding electric welding machine.
Background
Generally, for manual electric arc welding using a cellulose welding rod, due to the characteristic that the cellulose welding rod is easy to break an arc, the no-load voltage requirement of an electric welding machine is high, and the output end of the electric welding machine is required to be connected with an inductor with larger inductance in series, so that the no-load voltage of the electric welding machine is improved, the reverse voltage peak of a rectifier diode on a secondary rectification side is inevitably improved, the loss of a diode is increased, the number of turns of a secondary side of a transformer is increased, the current flowing in an IGBT tube on an inversion side is increased, the loss is increased, and other problems need to be solved.
Disclosure of Invention
According to the embodiment of the invention, an auxiliary pilot arc circuit for a manual welding electric welding machine is provided, wherein a power supply circuit of the manual welding electric welding machine adopts an inverter power supply circuit, the inverter power supply circuit outputs low-voltage direct current to the manual welding electric welding machine after alternating current power supply is rectified, inverted, stepped down and single-phase rectified, and the auxiliary pilot arc circuit comprises:
the primary side of the pulse transformer comprises a first winding and a second winding, and the input end of the first winding is connected with an alternating current power supply;
the power supply end of the power supply management chip is connected with the second winding on the primary side of the pulse transformer;
the pilot arc current control circuit is respectively connected with the output end of the power supply management chip, the current sensing end and the output end of the first winding on the primary side of the pulse transformer and is used for controlling the manual welding electric welding machine to output pilot arc current;
the pilot arc current output circuit is respectively connected with the secondary side of the pulse transformer and the output anode of the power supply circuit and is used for outputting pilot arc current to the manual welding electric welding machine;
and the voltage feedback circuit is respectively connected with the feedback voltage input end of the power management chip and the output cathode of the power circuit and is used for generating control voltage and controlling the width of the pilot arc current pulse.
Further, the pilot arc current control circuit includes:
the drain electrode of the power switch tube is connected with the output end of the first winding;
the two ends of the driving resistor are respectively connected with the output end of the power management chip and the grid electrode of the power switch tube;
one end of the first sampling resistor is connected with the source electrode of the power switch tube and the current sensing end of the power management chip, and the other end of the first sampling resistor is grounded.
Further, the pilot arc current control circuit further comprises:
the input end of the absorption circuit is connected with the output end of the first winding, and the output end of the absorption circuit is connected with the input end of the first winding;
and the first filter circuit is arranged between the first sampling resistor and the current sensing end of the power management chip.
The absorption circuit comprises an absorption resistor, an absorption capacitor and an absorption diode which are connected in series, the absorption resistor and the absorption capacitor are connected in parallel and then connected in series with the absorption diode, the anode of the absorption diode is connected with the drain electrode of the power switch tube and the output end of the first winding, the cathode of the diode is connected with one end of the parallel circuit of the absorption capacitor and the absorption diode, and the other end of the parallel circuit of the absorption capacitor and the absorption diode is connected with the input end of the first winding.
Furthermore, the first filter circuit comprises a first filter resistor and a first filter capacitor which are connected in series, the first filter capacitor is grounded, the other end of the first filter resistor is connected with the non-grounded end of the first sampling resistor, and the midpoint of the first filter resistor and the midpoint of the first filter capacitor are connected with the current sensing end of the power management chip.
Further, the pilot arc current output circuit includes:
the anode of the secondary diode is connected with the anode of the secondary side of the pulse transformer;
the two ends of the filter inductor are respectively connected with the negative electrode of the secondary diode and the output positive electrode of the power circuit;
and the anode of the output capacitor is connected with the cathode of the secondary diode, and the cathode of the output capacitor is respectively connected with the cathode of the secondary side of the pulse transformer and the output cathode of the power circuit.
Further, the voltage feedback circuit includes:
two ends of the second sampling resistor are respectively connected with the cathode of the secondary side of the pulse transformer and the output cathode of the power circuit;
the amplifying circuit comprises an amplifier and an amplifying resistor, two ends of the amplifying resistor are respectively connected with the reverse input end and the output end of the amplifier, and the reverse input end of the amplifier is connected with the output cathode of the power circuit and the second sampling resistor;
the voltage divider is a series circuit formed by connecting a pair of resistors in series, one end of the series circuit is grounded, the other end of the series circuit is connected with a high level, and the midpoint of the series circuit is connected with the homodromous input end of the amplifier;
the input end of the first photoelectric coupler is connected with the output end of the amplifier, the second photoelectric coupler is coupled and input through the first photoelectric coupler, and the output end of the second photoelectric coupler is connected with the feedback voltage input end of the power management chip;
and two ends of the feedback resistor are respectively connected with the feedback voltage input end of the power management chip and the ground, and the feedback resistor is used for generating current in the feedback resistor so as to generate a feedback voltage signal.
Further, the voltage feedback circuit further comprises: and the second filter capacitor is connected with the feedback resistor in parallel.
Further, the voltage feedback circuit further comprises: and the oscillation-proof capacitor is arranged between the internal error amplifier end and the feedback voltage input end of the power management chip.
Further, the oscillation preventing capacitor is an integrating capacitor.
According to the auxiliary pilot arc circuit for the manual welding machine, only a low-power pilot arc current is generated through a low-power electronic device, a mode that a main loop of the welding machine is changed to improve no-load voltage is not needed, and cost is greatly reduced;
and because of the filter inductance with low power, the main loop of the electric welding machine only needs to provide the inductance with small inductance, especially under the condition that the switching frequency of the electric welding machine is very high, even the output inductance is not needed, the parasitic inductance on the welding cable and the grounding cable is enough, and the cost on the main loop of the electric welding machine is reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and are intended to provide further explanation of the claimed technology.
Drawings
FIG. 1 is a schematic diagram of an auxiliary pilot arc circuit for a hand-weld welder, according to an embodiment of the present invention.
Detailed Description
The present invention will be further explained by describing preferred embodiments of the present invention in detail with reference to the accompanying drawings.
First, an auxiliary pilot arc circuit for a manual welding machine according to an embodiment of the present invention will be described with reference to fig. 1, which is widely applicable to manual welding machines.
As shown in fig. 1, in the auxiliary pilot arc circuit for the manual welding machine according to the embodiment of the present invention, the power supply circuit of the manual welding machine adopts an inverter power supply circuit, the inverter power supply circuit outputs low-voltage direct current to the manual welding machine after rectifying, inverting, stepping down and single-phase rectifying an alternating current power supply, and the auxiliary pilot arc circuit comprises a pulse transformer T1, a power supply management chip U1, a pilot arc current control circuit, a pilot arc current output circuit and a voltage feedback circuit. In this embodiment, the power management chip U1 is a power management chip with a model number UC 3843.
Specifically, as shown in fig. 1, the primary side of the pulse transformer T1 includes a first winding and a second winding, and the input terminal of the first winding is connected to the ac power source VIN.
Specifically, as shown in fig. 1, the power supply terminal VCC of the power management chip U1 is connected to the secondary winding on the primary side of the pulse transformer T1. In the embodiment, a control power supply is formed by a diode and a capacitor which are connected in series, and power is supplied to the power management chip U1.
Specifically, as shown in fig. 1, the pilot arc current control circuit is respectively connected to the output terminal OUT of the power management chip U1, the current sensing terminal ISNS, and the output terminal of the primary side first winding of the pulse transformer T1, and is configured to control the output of the pilot arc current output by the manual welding machine.
Further, as shown in fig. 1, the pilot arc current control circuit includes: the power switch tube T2, the driving resistor R1 and the first sampling resistor R2. The drain electrode D of the power switch tube T2 is connected with the output end of the first winding; two ends of the driving resistor R1 are respectively connected with the output end OUT of the power management chip U1 and the grid G of the power switch tube T2, and the driving resistor R1 is a driving resistor of the power switch tube T2; one end of the first sampling resistor R2 is connected to the source S of the power switch transistor T2 and the current sensing terminal ISNS of the power management chip U1, and the other end is grounded.
Further, as shown in fig. 1, in this embodiment, the pilot arc current control circuit further includes: an absorption circuit and a first filter circuit.
The absorption circuit comprises an absorption resistor R3, an absorption capacitor C1 and an absorption diode D1 which are connected in series and used for absorbing voltage spikes generated when the power switch tube T2 works. The absorption resistor R3 and the absorption capacitor C1 are connected in parallel and then connected in series with the absorption diode D1, the anode of the absorption diode D1, namely the input end of the absorption circuit, is connected with the drain D of the power switch tube T2 and the output end of the first winding, the cathode of the diode is connected with one end of the parallel circuit of the absorption capacitor C1 and the absorption diode D1, and the other end of the parallel circuit of the absorption capacitor C1 and the absorption diode D1, namely the output end of the absorption circuit, is connected with the input end of the first winding.
The first filter circuit comprises a first filter resistor R4 and a first filter capacitor C2 which are connected in series, the first filter capacitor C2 is grounded, the other end of the first filter resistor R4 is connected with the non-grounded end of the first sampling resistor R2, the midpoint of the first filter resistor R4 and the midpoint of the first filter capacitor C2 are connected with a current sensing end ISNS of the power management chip U1, and the transmission current signal is CFB 1.
Specifically, as shown in fig. 1, the pilot arc current output circuit is respectively connected to the secondary side of the pulse transformer T1 and the output positive electrode of the power circuit, and is configured to output a pilot arc current to the manual welding machine.
Further, as shown in fig. 1, the pilot arc current output circuit includes: secondary diode D2, filter inductance L1, output capacitor C3. The anode of the secondary diode D2 is connected with the anode of the secondary side of the pulse transformer T1; the two ends of the filter inductor L1 are respectively connected with the cathode of the secondary diode D2 and the output anode of the power circuit; the anode of the output capacitor C3 is connected with the cathode of the secondary diode D2, and the cathode of the output capacitor C3 is connected with the cathode of the secondary side of the pulse transformer T1 and the output cathode of the power circuit, respectively.
Specifically, as shown in fig. 1, the voltage feedback circuit is respectively connected to the feedback voltage input terminal VFB of the power management chip U1 and the output negative terminal of the power circuit, and is used for generating a control voltage to control the width of the pilot arc current pulse.
Further, as shown in fig. 1, the voltage feedback circuit includes: the circuit comprises a second sampling resistor R5, an amplifying circuit, a voltage divider, a first photoelectric coupler U2A, a second photoelectric coupler U2B and a feedback resistor R6. Two ends of the second sampling resistor R5 are respectively connected with the cathode of the secondary side of the pulse transformer T1 and the output cathode of the power circuit; the amplifying circuit comprises an amplifier U3A and an amplifying resistor R7, two ends of the amplifying resistor R7 are respectively connected with the reverse input end and the output end of the amplifier U3A, and the reverse input end of the amplifier U3A is connected with the output cathode of the power supply circuit and the second sampling resistor R5; the voltage divider is a series circuit formed by connecting a pair of resistors in series, one end of the series circuit is grounded, the other end of the series circuit is connected with a high level, the midpoint of the series circuit is connected with the homodromous input end of the amplifier U3A, the voltage of the voltage divider input amplifier U3A determines the magnitude of the output pilot arc current of the auxiliary power supply, and in the embodiment, the high level of one end of the voltage divider is 15V; the input end of the first photoelectric coupler U2A is connected with the output end of the amplifier U3A, the second photoelectric coupler U2B is coupled and input through the first photoelectric coupler U2A, and the output end of the second photoelectric coupler U2B is connected with the feedback voltage input end VFB of the power management chip U1; the two ends of the feedback resistor R6 are respectively connected to the feedback voltage input terminal VFB of the power management chip U1 and the ground, and are used for generating a current in the feedback resistor R6 to generate a feedback voltage signal.
Further, in the present embodiment, as shown in fig. 1, the voltage feedback circuit further includes a second filter capacitor C4 connected in parallel with the feedback resistor R6.
Further, in this embodiment, as shown in fig. 1, the voltage feedback circuit further includes: the oscillation-proof capacitor C5 and the oscillation-proof capacitor C5 are integrated capacitors and arranged between an internal error amplifier (COMP) end and a feedback voltage input end VFB of the power management chip U1 to prevent the circuit from oscillation.
When the power supply circuit works, the pulse transformer T1 supplies power to the power supply management chip U1, the output end OUT of the power supply management chip U1 outputs current, voltage is generated at the rear end of the driving resistor R1, the driving power switch tube T2 is turned on, current is generated at the primary side of the pulse transformer T1, the current is filtered by the pilot arc current output circuit at the secondary side, small current of an auxiliary pilot arc is generated, when the power supply voltage is abnormal, the current of the power switch tube T2 is increased, when the voltage of the first sampling resistor R2 exceeds 1V, the output of the OUT end of the power supply management chip U1 is stopped, the rear end of the driving resistor R1 generates low level, the power switch tube T2 is turned off, and the power switch tube T2 is protected.
The second sampling resistor R5 is used for sampling auxiliary pilot arc current, the sampling signal is input to an amplifier U3A, meanwhile, a voltage divider also inputs voltage to an amplifier U3A, the output end of the amplifier U3A is connected to the input end of a first photoelectric coupler U2A after being amplified by an amplifying resistor R7, the current signal received by the first photoelectric coupler U2A is a current feedback signal and is photoelectrically coupled to a second photoelectric coupler U2B, current is generated on a feedback resistor R6 so as to be converted into a feedback voltage signal, the feedback voltage signal is filtered by a second filter capacitor C4 and is connected to a feedback voltage input end VFB of a power management chip U1, the feedback voltage signal received by the feedback voltage input end VFB is compared with a reference voltage at the same-direction input end of an internal error amplifier COMP by the power management chip U1 so as to generate a control voltage, thereby controlling the width of a pulse, and only a small-power pilot arc current can be generated by an electronic device with small power, need not to carry out any transformation to electric welding owner's return circuit to realized accurate controllable, reduced the cost greatly, improved the welding effect.
In addition, because the embodiment has a low-power filter inductor, only an inductor with a small inductance is required to be provided on the main loop of the electric welding machine, and particularly, under the condition that the switching frequency of the electric welding machine is very high, even no inductor is required to be output, and only parasitic inductors on a welding cable and a grounding cable are enough, so that the parasitic inductors are not increased, and the cost on the main loop of the electric welding machine is reduced.
In the above, with reference to fig. 1, the auxiliary pilot arc circuit for the manual welding machine according to the embodiment of the present invention is described, which only needs to generate a low-power pilot arc current through a low-power electronic device, and does not need to adopt a mode of changing a main loop of the welding machine to increase a no-load voltage, so that the cost is greatly reduced; and because of the filter inductance with low power, the main loop of the electric welding machine only needs to provide the inductance with small inductance, especially under the condition that the switching frequency of the electric welding machine is very high, even the output inductance is not needed, the parasitic inductance on the welding cable and the grounding cable is enough, and the cost on the main loop of the electric welding machine is reduced.
It should be noted that, in the present specification, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims. .
Claims (10)
1. The utility model provides an auxiliary pilot arc circuit for manual welding electric welding, manual welding electric welding's power supply circuit adopts inverter circuit, inverter circuit with alternating current power supply behind rectification, contravariant, step-down and single-phase rectification manual welding electric welding the output low-voltage direct current, its characterized in that contains:
the primary side of the pulse transformer comprises a first winding and a second winding, and the input end of the first winding is connected with the alternating current power supply;
the power supply end of the power supply management chip is connected with the second winding on the primary side of the pulse transformer;
the pilot arc current control circuit is respectively connected with the output end of the power supply management chip, the current sensing end and the output end of the first winding on the primary side of the pulse transformer and is used for controlling the manual welding electric welder to output pilot arc current;
the pilot arc current output circuit is respectively connected with the secondary side of the pulse transformer and the output anode of the power supply circuit and is used for outputting pilot arc current to the manual welding electric welding machine;
and the voltage feedback circuit is respectively connected with the feedback voltage input end of the power management chip and the output cathode of the power circuit and is used for generating control voltage and controlling the width of the pilot arc current pulse.
2. An auxiliary pilot arc circuit for a manual welding machine according to claim 1 wherein said pilot arc current control circuit comprises:
the drain electrode of the power switch tube is connected with the output end of the first winding;
the two ends of the driving resistor are respectively connected with the output end of the power management chip and the grid electrode of the power switch tube;
and one end of the first sampling resistor is connected with the source electrode of the power switch tube and the current sensing end of the power management chip, and the other end of the first sampling resistor is grounded.
3. An auxiliary pilot arc circuit for a manual welding machine according to claim 2 wherein said pilot arc current control circuit further comprises:
the input end of the absorption circuit is connected with the output end of the first winding, and the output end of the absorption circuit is connected with the input end of the first winding;
the first filter circuit is arranged between the first sampling resistor and the current sensing end of the power management chip.
4. An auxiliary pilot arc circuit for a manual welding machine according to claim 3 wherein the snubber circuit comprises a snubber resistor, a snubber capacitor and a snubber diode connected in series and in parallel, the snubber resistor and the snubber capacitor are connected in series with the snubber diode, the anode of the snubber diode is connected to the drain of the power switching tube and to the output of the first winding, the cathode of the diode is connected to one end of the parallel circuit of the snubber capacitor and the snubber diode, and the other end of the parallel circuit of the snubber capacitor and the snubber diode is connected to the input of the first winding.
5. The auxiliary pilot arc circuit for the manual welding machine according to claim 3, wherein the first filter circuit comprises a first filter resistor and a first filter capacitor which are connected in series, the first filter capacitor is grounded, the other end of the first filter resistor is connected with the non-grounded end of the first sampling resistor, and the first filter resistor and the midpoint of the first filter capacitor are connected with the current sensing end of the power management chip.
6. An auxiliary pilot arc circuit for a manual welding machine according to claim 1 wherein said pilot arc current output circuit comprises:
the anode of the secondary diode is connected with the anode of the secondary side of the pulse transformer;
the two ends of the filter inductor are respectively connected with the cathode of the secondary diode and the output anode of the power circuit;
and the anode of the output capacitor is connected with the cathode of the secondary diode, and the cathode of the output capacitor is respectively connected with the cathode of the secondary side of the pulse transformer and the output cathode of the power circuit.
7. An auxiliary pilot arc circuit for a manual welding machine according to claim 1 wherein said voltage feedback circuit comprises:
the two ends of the second sampling resistor are respectively connected with the cathode of the secondary side of the pulse transformer and the output cathode of the power circuit;
the amplifying circuit comprises an amplifier and an amplifying resistor, two ends of the amplifying resistor are respectively connected with the reverse input end and the output end of the amplifier, and the reverse input end of the amplifier is connected with the output cathode of the power circuit and the second sampling resistor;
the voltage divider is a series circuit formed by connecting a pair of resistors in series, one end of the series circuit is grounded, the other end of the series circuit is connected with a high level, and the midpoint of the series circuit is connected with the homodromous input end of the amplifier;
the input end of the first photoelectric coupler is connected with the output end of the amplifier, the second photoelectric coupler is coupled and input through the first photoelectric coupler, and the output end of the second photoelectric coupler is connected with the feedback voltage input end of the power management chip;
and two ends of the feedback resistor are respectively connected with the feedback voltage input end of the power management chip and the ground, and the feedback resistor is used for generating current in the feedback resistor so as to generate a feedback voltage signal.
8. An auxiliary pilot arc circuit for a manual welding bug according to claim 7 wherein the voltage feedback circuit further comprises: and the second filter capacitor is connected with the feedback resistor in parallel.
9. An auxiliary pilot arc circuit for a manual welding bug according to claim 7 wherein the voltage feedback circuit further comprises: an anti-oscillation capacitor disposed between an internal error amplifier terminal and a feedback voltage input terminal of the power management chip.
10. An auxiliary pilot arc circuit for a manual welding bug according to claim 9 wherein the anti-oscillation capacitor is an integrating capacitor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010043426.0A CN110948088A (en) | 2020-01-15 | 2020-01-15 | Auxiliary pilot arc circuit for manual welding machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010043426.0A CN110948088A (en) | 2020-01-15 | 2020-01-15 | Auxiliary pilot arc circuit for manual welding machine |
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| CN202010043426.0A Pending CN110948088A (en) | 2020-01-15 | 2020-01-15 | Auxiliary pilot arc circuit for manual welding machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114070117A (en) * | 2021-11-19 | 2022-02-18 | 杭州凯尔达电焊机有限公司 | Alternating current reversing pilot arc circuit and alternating current welding power supply |
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| CN212043074U (en) * | 2020-01-15 | 2020-12-01 | 上海焊煌电气有限公司 | Auxiliary pilot arc circuit for manual welding machine |
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2020
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| CN102794547A (en) * | 2012-08-04 | 2012-11-28 | 深圳市瑞凌实业股份有限公司 | Pilot arc chopped wave control circuit and cutting machine |
| CN102873435A (en) * | 2012-09-25 | 2013-01-16 | 北京工业大学 | Gas metal arc welding method and system |
| CN106735800A (en) * | 2017-03-17 | 2017-05-31 | 浙江三锋实业股份有限公司 | A kind of CUT arc maintenance electronics current-limiting resistance circuit |
| CN209239257U (en) * | 2018-12-27 | 2019-08-13 | 上海焊煌电气有限公司 | A kind of AC-DC argon arc welding machine auxiliary keep-alive circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114070117A (en) * | 2021-11-19 | 2022-02-18 | 杭州凯尔达电焊机有限公司 | Alternating current reversing pilot arc circuit and alternating current welding power supply |
| CN114070117B (en) * | 2021-11-19 | 2022-05-20 | 杭州凯尔达电焊机有限公司 | Alternating current reversing pilot arc circuit and alternating current welding power supply |
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