CN210099182U - MIG welding set - Google Patents
MIG welding set Download PDFInfo
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- CN210099182U CN210099182U CN201920694234.9U CN201920694234U CN210099182U CN 210099182 U CN210099182 U CN 210099182U CN 201920694234 U CN201920694234 U CN 201920694234U CN 210099182 U CN210099182 U CN 210099182U
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Abstract
The application relates to a MIG welding device, which comprises a wire feeding mechanism, a welding gun guide pipe, a welding gun, a compensation gas nozzle, a first gas source mechanism and a second gas source mechanism; one end of the welding gun guide pipe is connected with a welding gun, and the other end of the welding gun guide pipe is respectively connected with the first air source mechanism and the wire feeding mechanism; the compensation gas nozzle is connected with the second gas source mechanism and is fixed on the side of the nozzle of the welding gun; the first gas source mechanism is used for providing protective gas for MIG welding; the second gas source mechanism is used for providing compensation gas for stirring the welding pool after the welding pool is formed by MIG welding. This device strikes unset high temperature welding molten bath through introducing compensation gas efflux, has formed two protection gas structures, through exerting little external force to the molten bath, has effectively changed the liquid metal of original high-speed welding periodicity fluctuation and has piled up the form, makes peak region liquid metal flow to the trough, has formed comparatively pleasing to the eye welding seam, has greatly promoted welding quality.
Description
Technical Field
The utility model relates to the field of welding technique, especially, relate to a MIG welding set.
Background
The high-speed Welding technology belongs to the field of the intensive research of modern high-efficiency Welding technology, and metal Inert-gas Welding (MIG Welding) is one of the main methods of the current high-speed Welding. However, when the MIG welding is used for high-speed welding, as other welding methods work in a high-speed welding state, there is a more prominent problem: when the welding speed is increased to a certain value, the defects of undercut, hump and the like can occur in the welding seam. The defects not only deteriorate the appearance of the welding seam, but also seriously affect the mechanical property of the welding seam, and become the most main reason for further improving the welding speed and efficiency.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve above-mentioned technical problem and provide a MIG welding set.
The utility model provides an above-mentioned technical problem's technical scheme as follows: a MIG welding device comprises a wire feeding mechanism, a welding gun guide pipe, a welding gun, a compensation gas nozzle, a first gas source mechanism and a second gas source mechanism.
One end of the welding gun guide pipe is connected with the welding gun, and the other end of the welding gun guide pipe is respectively connected with the first air source mechanism and the wire feeding mechanism.
The compensation gas nozzle is connected with the second gas source mechanism and fixed on the side of the nozzle of the welding gun.
The first gas supply mechanism is used to provide shielding gas for MIG welding.
The second gas source mechanism is used for providing compensation gas for stirring the welding molten pool after the welding molten pool is formed by MIG welding.
The utility model has the advantages that firstly, the first gas source mechanism provides the shielding gas needed by MIG welding, the shielding gas is conveyed to the nozzle of the welding gun through the welding gun conduit, meanwhile, the wire feeding mechanism conveys the welding wire to a nozzle of a welding gun through a guide pipe of the welding gun to realize MIG welding, then, the second gas source mechanism delivers compensation gas for stirring the welding pool to a compensation gas nozzle during MIG welding, thereby forming a double protective gas structure, the compensating gas jet introduced by the second gas source mechanism impacts the non-solidified high-temperature welding pool, by applying a small external force to the molten pool, the accumulation form of the original periodically fluctuated liquid metal in high-speed welding is effectively changed, the liquid metal in the peak area flows to the wave trough, and a more attractive welding seam is formed, so that the welding seam forming of high-speed stainless steel welding is improved, and the welding quality is greatly improved. The first air source mechanism and the second air source mechanism are independent from each other, so that the problem of mutual interference of air flows caused by the fact that the same air source is adopted to divide two branch air flows is avoided, and the stability of the air flows is guaranteed.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Further, the device comprises a control component, a voltage sensor, a current sensor and a power supply component.
The power supply assembly is respectively connected with the voltage sensor, the current sensor, the welding gun and the control assembly, and the control assembly is respectively connected with the current sensor and the voltage sensor.
The control assembly is respectively connected with the wire feeding mechanism, the first air source mechanism and the second air source mechanism.
The control assembly is used for receiving instructions input by a user to control the wire feeding mechanism, the first air supply mechanism and the second air supply mechanism and receiving detection signals of the current sensor and the voltage sensor to control the output power of the power supply assembly.
The power supply assembly has the advantages that when the power supply assembly provides working voltage for the welding gun, the control assembly controls the output power of the power supply assembly in real time according to detection signals of the current sensor and the voltage sensor. The stability of welding power is ensured.
Further, the power supply assembly comprises a three-phase bridge rectifier, a direct current filter, a high-power inverter, an intermediate frequency transformer, a fast diode full-wave rectifier and an output reactor.
The input end of the three-phase bridge rectifier is connected with industrial voltage, the output end of the three-phase bridge rectifier is connected with the input end of the direct current filter, the output end of the direct current filter is connected with the input end of the high-power inverter, the output end of the high-power inverter is connected with the input end of the intermediate frequency transformer, the output end of the intermediate frequency transformer is connected with the input end of the fast diode full-wave rectifier, the output end of the fast diode full-wave rectifier is connected with the input end of the output reactor, and the output end of the output reactor is respectively connected with the voltage sensor, the current sensor and the welding; the high-power inverter is also connected with the control assembly.
The further scheme has the advantages that three-phase alternating current is converted into direct current through the three-phase bridge rectifier, alternating current components in the direct current are filtered out through the direct current filter, the filtered direct current is led into the high-power inverter to be inverted into 20kHz intermediate frequency alternating current, and then the 20kHz intermediate frequency alternating current is converted into low-voltage high-current electric energy through the intermediate frequency transformer. And then the low-voltage large current is rectified and filtered again by utilizing the full-wave rectification of the fast diode and the output reactor, so that the 380V/50Hz industrial electricity is effectively changed into low-voltage large current direct current for output.
Furthermore, the control assembly comprises a controller, a voltage sampling and filtering circuit, a current sampling and filtering circuit, a phase control circuit, a driving circuit, a rectifying circuit and a current transformer.
The controller is respectively connected with the voltage sampling and filtering circuit, the current sampling and filtering circuit and the phase control circuit.
The voltage sampling and filtering circuit is also connected with the voltage sensor, and the current sampling and filtering circuit is also connected with the current sensor.
The phase control circuit is further respectively connected with the driving circuit and the rectifying circuit, the rectifying circuit is further connected with a current transformer, and the current transformer is used for detecting the output current of the high-power inverter.
The method has the advantages that the voltage and the current in the power loop are sampled and processed by the current sampling and filtering circuit and the voltage sampling and filtering circuit, the processed signals are input into the A/D conversion port of the controller to be subjected to analog-to-digital conversion, digital signals which are easier to process are formed, the input signals are processed by the controller, the D/A converter of the controller is used for outputting control signals, the phase control circuit, the driving circuit and the rectifying circuit are controlled to generate real-time driving signals, and therefore the output voltage and current are effectively controlled in real time.
Further, the control assembly further comprises an optical coupler isolator connected with the controller, and a temperature protection circuit, a phase-failure protection circuit and an undervoltage protection circuit which are respectively connected with the optical coupler isolator.
The beneficial effect who adopts above-mentioned further scheme is that, protect power supply module through setting up temperature protection circuit, open-phase protection circuit and undervoltage protection circuit, guarantee that power supply module can work safely.
Further, the first air supply mechanism comprises a first air bottle, a first air supply pipe and a first electric air valve, one end of the first air supply pipe is connected with the first air bottle, the other end of the first air supply pipe is connected with the welding gun guide pipe, and the first electric air valve is arranged on the first air supply pipe.
The second air source mechanism comprises a second air bottle, a second air supply pipe and a second electric air valve, one end of the second air supply pipe is connected with the second air bottle, the other end of the second air supply pipe is connected with the compensation gas nozzle, and the second electric air valve is arranged on the second air supply pipe.
The first electric air valve and the second electric air valve are respectively connected with the controller.
Further, a one-way air valve is connected between the compensation gas nozzle and the second air supply pipe.
The one-way air valve is arranged between the compensation gas nozzle and the second air supply pipe, so that the compensation gas is prevented from flowing back.
Further, the first air supply pipe is also provided with a first flowmeter; the second air supply pipe is also provided with a second flowmeter;
the first flow meter and the second flow meter are respectively connected with the controller.
The air flow monitoring device has the advantages that the first air supply pipe is provided with the first flowmeter, and the second air supply pipe is provided with the second flowmeter, so that the conveying condition of air flow can be effectively monitored.
Furthermore, the control assembly is also connected with a human-computer interaction device.
The beneficial effect of adopting the further scheme is that the welding device is conveniently monitored and controlled by arranging the human-computer interaction equipment.
Furthermore, the control assembly is respectively connected with the first air source mechanism and the second air source mechanism through GPIO communication circuits.
Drawings
Fig. 1 is a schematic structural diagram of a MIG welding device according to an embodiment of the present invention;
fig. 2 is a schematic view illustrating a weld formed by welding with a MIG welding apparatus according to an embodiment of the present invention;
fig. 3 is a block diagram illustrating a MIG welding apparatus according to an embodiment of the present invention;
fig. 4 is a block diagram of another MIG welding apparatus according to an embodiment of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. a welding torch conduit, 2, a wire feeder, 3, a first gas cylinder, 31, a first gas feed pipe, 32, a first electric gas valve, 33, a first flowmeter, 4, a second gas cylinder, 41, a second gas feed pipe, 42, a second electric gas valve, 43, a second flowmeter, 44, a one-way gas valve, 5, a welding torch, 6, a compensation gas nozzle, 7, a welding wire, 8, a shielding gas, 9, a compensation gas, 10 and a welding pool.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a MIG welding device, which includes a wire feeding mechanism 2, a welding gun conduit 1, a welding gun 5, a compensation gas nozzle 6, a first gas source mechanism and a second gas source mechanism.
One end of the welding gun conduit 1 is connected with the welding gun 5, and the other end of the welding gun conduit is respectively connected with the first air source mechanism and the wire feeding mechanism 2.
The compensation gas nozzle 6 is connected with the second gas source mechanism, and the compensation gas nozzle 6 is fixed on the side of the nozzle of the welding gun 5.
The side of the nozzle of the welding torch 5 generally means the side opposite to the moving direction of the nozzle of the welding torch 5.
The first gas supply mechanism is used to provide a shielding gas 8 for MIG welding.
The second gas source mechanism is used for providing compensation gas 9 for stirring the welding molten pool 10 after the MIG welding forms the welding molten pool 10.
Wherein, one end of the welding wire 7 is connected with the wire feeder 2, and the other end thereof extends out of the nozzle of the welding gun 5. The wire feeder 2 is used for continuously feeding the welding wire 7 to the welding gun 5.
When the weld pool is MIG welding, a liquid metal part with a certain shape is formed on the weldment under the action of a heat source.
Specifically, the first gas source mechanism comprises a first gas cylinder 3, a first gas supply pipe 31 and a first electric gas valve 32, one end of the first gas supply pipe 31 is connected with the first gas cylinder 3, the other end of the first gas supply pipe 31 is connected with the welding gun guide pipe 1, and the first electric gas valve 32 is arranged on the first gas supply pipe 31.
The second gas source mechanism comprises a second gas cylinder 4, a second gas supply pipe 41 and a second electric gas valve 42, one end of the second gas supply pipe 41 is connected with the second gas cylinder 4, the other end of the second gas supply pipe is connected with the compensation gas nozzle 6, and the second electric gas valve 42 is arranged on the second gas supply pipe 41.
In practical application, the first gas cylinder 3 provides shielding gas 8 in the welding gun 5, the second gas cylinder 4 provides compensation gas 9 in the compensation gas nozzle 6, and the shielding gas 8 and the compensation gas 9 are controlled to be on and off by the first electric gas valve 32 and the second electric gas valve 42 respectively. First and second electrically operated valves 32 and 42 may be opened 2 seconds in advance to allow gas flow before welding begins. Then, a gas hood of the welding gun 5 can be arranged outside the nozzle of the welding gun 5 to fix the spraying direction of the protective gas flow, and the compensating gas 9 can be sprayed out from the compensating gas nozzle 6 in a free jet form to impact the high-temperature liquid welding pool 10. The jet flow sprayed out from the jet nozzle of the compensation gas 9 carries kinetic energy, the jet flow impact force can influence the dynamic balance of the molten pool to generate deformation, the effects of stirring the molten pool and isolating air for high-temperature welding seams are achieved, and the appearance forming of the welding seams can be obviously improved.
As shown in fig. 2, the compensation section in fig. 2 is a weld seam obtained by auxiliary welding with the compensation gas 9, and the uncompensated section in fig. 2 is a weld seam obtained by auxiliary welding without the compensation gas 9, and the welding parameters are the same except for the presence or absence of the compensation gas 9. It is evident from the figure that the weld of the compensating gas 9 jet section, i.e. the compensating section, is straight and uniform, whereas the weld of the uncompensated gas 9 jet section, i.e. the uncompensated section, presents two distinct craters, between which there is a raised metal accumulation, making the whole weld discontinuous, which is a result of the welding speed being too fast, therefore, the weld quality can be greatly improved by welding with the double shielding gas structure of the compensating gas 9.
In one embodiment, the welding device further includes a control assembly, a voltage sensor, a current sensor, and a power supply assembly, as shown in fig. 3.
The power supply assembly is respectively connected with the voltage sensor, the current sensor, the welding gun 5 and the control assembly, and the control assembly is respectively connected with the current sensor and the voltage sensor.
The control assembly is respectively connected with the wire feeding mechanism 2, the first air source mechanism and the second air source mechanism.
The control assembly is used for receiving instructions input by a user to control the wire feeder 2, the first air supply mechanism and the second air supply mechanism, and receiving detection signals of the current sensor and the voltage sensor to control the output power of the power supply assembly.
Specifically, the power supply assembly comprises a three-phase bridge rectifier, a direct current filter, a high-power inverter, an intermediate frequency transformer, a fast diode full-wave rectifier and an output reactor;
the input end of the three-phase bridge rectifier is connected with industrial voltage, the output end of the three-phase bridge rectifier is connected with the input end of the direct current filter, the output end of the direct current filter is connected with the input end of the high-power inverter, the output end of the high-power inverter is connected with the input end of the intermediate frequency transformer, the output end of the intermediate frequency transformer is connected with the input end of the fast diode full-wave rectifier, the output end of the fast diode full-wave rectifier is connected with the input end of the output reactor, and the output end of the output reactor is respectively connected with the voltage sensor, the current sensor and the welding gun;
the high-power inverter is also connected with the control assembly.
In practical application, 380V/50Hz industrial electricity can be firstly introduced into a passive power factor correction module for power factor correction, then three-phase alternating current is converted into direct current by using a three-phase bridge rectifier, alternating current components in the direct current are filtered by using a direct current filter, the filtered direct current is introduced into a high-power inverter, the direct current is inverted into 20kHz intermediate frequency alternating current, and then the 20kHz intermediate frequency alternating current is converted into low-voltage large-current electric energy by using an intermediate frequency transformer. And performing rectification filtering again on the low-voltage large current by using a fast diode full-wave rectification and output reactor, and finally converting the low-voltage large current into low-voltage large current direct current for output.
Specifically, as shown in fig. 4, the control component includes a controller, a voltage sampling and filtering circuit, a current sampling and filtering circuit, a phase control circuit, a driving circuit, a rectifying circuit, and a current transformer.
The controller is respectively connected with the voltage sampling and filtering circuit, the current sampling and filtering circuit and the phase control circuit.
The voltage sampling and filtering circuit is also connected with the voltage sensor, and the current sampling and filtering circuit is also connected with the current sensor.
The phase control circuit is further respectively connected with the driving circuit and the rectifying circuit, the rectifying circuit is further connected with a current transformer, and the current transformer is used for detecting the output current of the high-power inverter. The controller, the voltage sampling and filtering circuit, the current sampling and filtering circuit, the phase control circuit, the driving circuit, the rectifying circuit and the current transformer form a control assembly, the voltage and the current in the power loop can be sampled and processed by the current sampling and filtering circuit and the voltage sampling and filtering circuit, the processed voltage and current are input into an A/D conversion port of the controller to be subjected to analog-to-digital conversion, a digital signal which is easier to process is formed, the input signal is processed by the controller, the D/A converter of the controller is used for outputting a control signal, and the phase control circuit, the driving circuit and the rectifying circuit are controlled to generate a real-time driving signal, so that the output voltage and current are effectively controlled in real time.
Optionally, the control assembly further includes an optical coupler isolator connected to the controller, and a temperature protection circuit, a phase-loss protection circuit and an under-voltage protection circuit respectively connected to the optical coupler isolator. Through setting up the opto-isolator and respectively with temperature protection circuit, open-phase protection circuit and the undervoltage protection circuit that the opto-isolator is connected, can play better guard action to power supply module.
Optionally, a one-way gas valve 44 is also connected between the compensation gas nozzle and the second gas delivery pipe. By providing a one-way gas valve 44 between the compensation gas nozzle and the second gas feed pipe, the compensation gas is prevented from flowing back.
Optionally, the first air feed pipe is further provided with a first flow meter 33; a second flowmeter 43 is also arranged on the second air supply pipe; the first flow meter 33 and the second flow meter 43 are connected to the controller, respectively. By providing the first flow meter 33 in the first air feed pipe and the second flow meter 43 in the second air feed pipe, the conveyance state of the air flow can be effectively monitored.
In practical application, the controller adopts a TMS320F2808 controller, a voltage sampling circuit samples and processes voltage and current in a power loop, and then inputs the sampled and processed voltage and current into an A/D conversion port of a DSP controller to perform analog-to-digital conversion, so as to form a digital signal which is easier to process, the input signal is processed by means of strong high-speed computing capability of the DSP, and then a D/A converter is used for outputting a control signal to control a main control chip UC3846 of a driving circuit to generate a real-time driving signal, so as to control the output voltage and current in real time.
The TMS320F2808 controller can use GPIO as a bridge to control the on and off of an airflow control switch of a two-way airflow system consisting of the first air source mechanism and the second air source mechanism.
The TMS320F2808 controller may control the wire feeder 2, among other things, using the RS-422 communication module.
Optionally, the control assembly is further connected with a human-computer interaction device. Specifically, STM32F103C4 and EPM240T100 can be used as control chips of human-computer interaction interfaces to control external LEDs, nixie tubes and the like to make corresponding state display.
In practical application, the control assembly receives welding control parameters sent by the human-computer interaction interface device, meanwhile, the set parameters are used for controlling the main power circuit, return information such as welding voltage, welding current, welding temperature, protective gas flow branch signals and the like is received and uploaded, then closed-loop control is carried out, meanwhile, obtained result data are transmitted to the human-computer interaction interface, and an operator judges parameter setting or parameter keeping in the next step through the returned data.
To sum up, the MIG welding set of this embodiment can adopt the modular design under not increasing the design degree of difficulty and the system cost condition, the utility model has the advantages of easily design realization, functional module ization, the external equipment inserts the complexity and hangs down, and is with low costs, is fit for popularizing and applying. In addition, the gas jet flow introduced into the two-way protective gas branch impacts the non-solidified high-temperature welding molten pool 10, and by applying a small external force to the molten pool, the original periodically fluctuant liquid metal accumulation form of high-speed welding is effectively changed, so that the liquid metal in the peak area flows to the wave trough, a more attractive welding seam is formed, and the welding seam forming of high-speed stainless steel welding is improved.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. The MIG welding device is characterized by comprising a wire feeding mechanism (2), a welding gun guide pipe (1), a welding gun (5), a compensation gas nozzle (6), a first gas source mechanism and a second gas source mechanism;
one end of the welding gun guide pipe (1) is connected with the welding gun (5), and the other end of the welding gun guide pipe is respectively connected with the first air source mechanism and the wire feeding mechanism (2);
the compensation gas nozzle (6) is connected with the second gas source mechanism, and the compensation gas nozzle (6) is fixed on the side of the nozzle of the welding gun (5);
the first gas supply mechanism is used for providing protective gas (8) for MIG welding;
the second gas source mechanism is used for providing compensation gas (9) for stirring a welding molten pool (10) after the MIG welding forms the welding molten pool (10).
2. MIG welding device according to claim 1, characterized in that the first gas supply mechanism comprises a first gas cylinder (3), a first gas feed pipe (31) and a first electrically operated gas valve (32); one end of the first air supply pipe (31) is connected with the first air bottle (3), the other end of the first air supply pipe is connected with the welding gun guide pipe (1), and the first electric air valve (32) is arranged on the first air supply pipe (31);
the second air source mechanism comprises a second air bottle (4), a second air supply pipe (41) and a second electric air valve (42), one end of the second air supply pipe (41) is connected with the second air bottle (4), the other end of the second air supply pipe is connected with the compensation gas nozzle (6), and the second electric air valve (42) is arranged on the second air supply pipe (41).
3. MIG welding device according to claim 2, characterized in that a one-way gas valve (44) is also connected between the compensation gas nozzle (6) and the second gas feed pipe (41).
4. MIG welding device according to claim 3, characterized in that a first flow meter (33) is also arranged on the first gas feed pipe (31); the second air supply pipe (41) is also provided with a second flowmeter (43).
5. The MIG welding device of claim 1, further comprising a control component, a voltage sensor, a current sensor, and a power supply component;
the power supply assembly is respectively connected with the voltage sensor, the current sensor, the welding gun (5) and the control assembly;
the control assembly is respectively connected with the current sensor, the voltage sensor, the wire feeding mechanism (2), the first air source mechanism and the second air source mechanism;
the control assembly is used for receiving instructions input by a user to control the wire feeding mechanism, the first air supply mechanism and the second air supply mechanism and receiving detection signals of the current sensor and the voltage sensor to control the output power of the power supply assembly.
6. The MIG welding apparatus of claim 5, wherein the power supply assembly includes a three-phase bridge rectifier, a dc filter, a high power inverter, a medium frequency transformer, a fast diode full wave rectifier, and an output reactor;
the input end of the three-phase bridge rectifier is connected with industrial voltage, the output end of the three-phase bridge rectifier is connected with the input end of the direct current filter, the output end of the direct current filter is connected with the input end of the high-power inverter, the output end of the high-power inverter is connected with the input end of the intermediate frequency transformer, the output end of the intermediate frequency transformer is connected with the input end of the fast diode full-wave rectifier, the output end of the fast diode full-wave rectifier is connected with the input end of the output reactor, and the output end of the output reactor is respectively connected with the voltage sensor, the current sensor and the welding gun;
the high-power inverter is also connected with the control assembly.
7. The MIG welding device of claim 6 wherein the control assembly includes a controller, a voltage sampling and filtering circuit, a current sampling and filtering circuit, a phase control circuit, a drive circuit, a rectifier circuit and a current transformer;
the controller is respectively connected with the voltage sampling and filtering circuit, the current sampling and filtering circuit and the phase control circuit;
the voltage sampling and filtering circuit is also connected with the voltage sensor, and the current sampling and filtering circuit is also connected with the current sensor;
the phase control circuit is further respectively connected with the driving circuit and the rectifying circuit, the rectifying circuit is further connected with a current transformer, and the current transformer is used for detecting the output current of the high-power inverter.
8. The MIG welding device of claim 7, wherein the control assembly further includes an opto-isolator connected to the controller and a temperature protection circuit, a phase loss protection circuit and an under-voltage protection circuit respectively connected to the opto-isolator.
9. MIG welding apparatus as claimed in any one of the claims 6 to 8 wherein a human interaction device is also connected to the control assembly.
10. The MIG welding device of any of the claims 6 to 8, wherein the control module is connected to the first and second gas supply mechanisms respectively through GPIO communications circuitry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201920694234.9U CN210099182U (en) | 2019-05-15 | 2019-05-15 | MIG welding set |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920694234.9U CN210099182U (en) | 2019-05-15 | 2019-05-15 | MIG welding set |
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| CN210099182U true CN210099182U (en) | 2020-02-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110076429A (en) * | 2019-05-15 | 2019-08-02 | 贵州民族大学 | A kind of MIG welder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110076429A (en) * | 2019-05-15 | 2019-08-02 | 贵州民族大学 | A kind of MIG welder |
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