CN114939710A - Method for promoting falling of short-circuit transition molten drops in carbon dioxide gas shielded welding - Google Patents
Method for promoting falling of short-circuit transition molten drops in carbon dioxide gas shielded welding Download PDFInfo
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- 238000003466 welding Methods 0.000 title claims abstract description 149
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 230000007704 transition Effects 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 50
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 37
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 32
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- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
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- 229910000679 solder Inorganic materials 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
- B23K9/16—Arc welding or cutting making use of shielding gas
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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
- B23K9/32—Accessories
Abstract
The invention relates to a method for promoting the shedding of short-circuit transition molten drops in carbon dioxide arc welding, which is applied to a molten drop form control device of carbon dioxide arc welding and comprises the following steps: supplying power to the magnetic induction coil by using an excitation power supply so that the magnetic induction coil generates a longitudinal magnetic field to the molten drop area; detecting a welding arc voltage signal of the welding gun by using a control system, and controlling an excitation power supply to supply power to the magnetic induction coil when the welding arc voltage signal rises; when the welding arc voltage signal has a falling edge, controlling an excitation power supply to stop supplying power to the magnetic induction coil; the magnetic induction coil generates a longitudinal magnetic field when the current of an excitation power supply is introduced; the longitudinal magnetic field exerts a lorentz force on a droplet at the end of the welding wire of the welding gun, and the lorentz force is used for twisting the droplet so as to enable the droplet to fall off. The invention is suitable for medium and large current CO 2 Gas shielded welding with improved droplet transferFrequency, improve work efficiency.
Description
Technical Field
The invention relates to the technical field of gas shielded welding, in particular to a method for promoting falling of short-circuit transition molten drops in carbon dioxide gas shielded welding.
Background
Carbon dioxide (CO) 2 ) The gas shielded welding adopts pure carbon dioxide gas as shielding gasThe traditional electric arc welding technology has the advantages of low cost, high efficiency, low hydrogen, rust resistance, strong crack resistance and the like, and is widely applied to various fields of modern industry.
In the welding process of carbon dioxide gas shielded welding, short circuit transition is a main transition mode, and liquid metal splashing phenomenon exists during welding. The splashing mainly comes from electric explosion splashing at the end of a short circuit, namely the main reason of the splashing is that the current at the end of the short circuit is increased rapidly, the section of the liquid small bridge is reduced continuously under the action of electromagnetic contraction force generated by the short circuit current, and finally, a necking is formed, the liquid metal at the necking is heated rapidly, so that the accumulation of excess energy is caused, and finally, the small bridge is subjected to vaporization explosion. In order to make the molten drop smoothly transit into the molten pool, domestic and foreign scholars make many researches, which are as follows:
(1) the Surface Tension transition technology (STT) provided by Lincoln corporation of America combines high frequency inversion technology and advanced waveform control technology to develop an Inverter STT II welding machine, which fundamentally solves the problem of vaporization and explosion of liquid state 'small bridge', and has the core that welding current is instantly reduced after necking is formed, and the 'small bridge' of liquid metal is pulled off under the combined action of Surface Tension, gravity and electromagnetic force, so that a molten drop is converted into a free transition mode under the action of Surface Tension from a short circuit transition mode.
(2) A Cold Metal Transfer (CMT) technology researched by Fronius company of Austria adopts a digitally controlled innovative wire feeding system, short circuit transition and welding wire movement are combined, a new molten drop transition control method and a low heat input welding method are provided, molten drops are forced to be transited into a molten pool by means of inertia in a welding wire drawing back mode, the drawing back frequency reaches about 70 times per second, and a heat-Cold-heat alternating circulation mode is formed in the whole welding process, so that low heat input welding is realized.
(3) A new welding method cbt (controlled Bridge transfer) technology for controlled bridging transition developed by OTC corporation of japan. The arc itself is used as a sensor to detect a short-circuit signal, and when a short circuit occurs, the current value is rapidly reduced to prevent splashing. The arc voltage can deviate in the short-circuit process, the time of the electric arc after reignition can be accurately predicted by detecting the deviation amount of the standard voltage in a short period of time when the short circuit occurs, the current value is rapidly reduced before the electric arc is about to reignite, the molten drop loses the restraint effect of other forces such as electromagnetic force, the molten drop is transited from the end of the welding wire to a molten pool by means of the surface tension of the molten drop, and the short-circuit transition process almost without splashing is completed.
Patent literature proposes a droplet shape control device and method for carbon dioxide arc welding. The literature introduces a longitudinal synchronous magnetic pulse at the end of short circuit, the transition frequency of molten drops is greatly increased, molten drops with sharp corners are changed into round and smooth molten drops without sharp corners, and the molten drop form is improved; the literature introduces that a magnetic field is added in the whole process of burning arc and short circuit of CO2 welding, the molten drop transition process is obviously changed, the external magnetic field can control the welding arc and molten drop transition process, effectively stir liquid metal, change the crystallization condition of the liquid metal, refine crystal grains, reduce splashing and improve forming, and the obtained welding line surface is flat and smooth and is superior to the welding line surface without the magnetic field. The arc itself is used as a sensor to detect a short-circuit signal, and when a short circuit occurs, the current value is rapidly reduced to prevent splashing. The arc voltage can deviate in the short circuit process, the time of arc reignition can be accurately predicted by detecting the deviation amount of the standard voltage in a short period of time of short circuit occurrence, the current value is rapidly reduced before the arc reignition, the molten drop loses the restraint effect of other forces such as electromagnetic force and the like, and the short circuit transition process almost without splashing is completed by virtue of transition from the end part of the welding wire to a molten pool under the surface tension of the molten drop. The prior art method solves the problem of splashing of carbon dioxide gas shielded welding at a small current (below 130A) by controlling the droplet transition mode, but the droplet falling off at a short-circuit transition mode still has certain difficulty at a large (above 130A) welding current, and the droplet at the end of the welding wire can not be smoothly transited into a molten pool.
The patent literature also proposes a synchronous magnetic field control idea, in which different types of magnetic pulses are applied at different stages during the short-circuit stage CO2 solder droplet transfer process to meet the requirements of different current magnitudes and electromagnetic forces at different stages of the short-circuit transition. Under the condition, a method of adding synchronous electromagnetic pulse (the application of a magnetic field is only synchronous with the short-circuit stage; the exciting current and the welding current are cooperatively controlled) outside the short-circuit stage of the carbon dioxide gas shielded welding is adopted, the Lorentz force generated by the magnetic field is used for controlling the molten drop at the end of the welding wire, the stress state of the molten drop is changed, the molten drop is promoted to be transferred into a molten pool, the molten drop transfer frequency is improved to different degrees, and the lifting amplitude is different from 30Hz to 107 Hz. But the frequency of droplet transfer needs to be increased.
Therefore, the problem of splashing of carbon dioxide gas shielded welding at low current is solved by controlling the droplet transition mode in the prior art, but the droplet falling off in the short-circuit transition mode still has certain difficulty at medium and large welding current, and the droplet at the end of the welding wire can not be smoothly transited into a molten pool.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for promoting the shedding of short-circuit transition molten drops in carbon dioxide arc welding.
In order to achieve the purpose, the invention provides the following scheme:
a method for promoting the shedding of short-circuit transition molten drops in carbon dioxide arc welding is applied to a molten drop shape control device of the carbon dioxide arc welding, wherein the molten drop shape control device comprises a magnetic induction coil, an excitation power supply, a welding gun and a control system; the excitation power supply is connected with the magnetic induction coil, the magnetic induction coil is arranged at the end part of the welding gun, and the control system is connected with the output end of the welding gun; the method comprises the following steps:
supplying power to a magnetic induction coil by using the excitation power supply so that the magnetic induction coil generates a longitudinal magnetic field to a molten drop area;
detecting a welding arc voltage signal of the welding gun by using a control system, and controlling the excitation power supply to supply power to the magnetic induction coil when the welding arc voltage signal has a rising edge; when the welding arc voltage signal has a falling edge, controlling the excitation power supply to stop supplying power to the magnetic induction coil; the magnetic induction coil generates the longitudinal magnetic field when the current of the excitation power supply is introduced; the longitudinal magnetic field exerts Lorentz force on a molten drop at the end of a welding wire of the welding gun, and the Lorentz force is used for twisting the molten drop so as to enable the molten drop to fall off.
Preferably, the adjusting range of the excitation pulse current generated by the excitation power supply is 100A to 200A.
Preferably, the welding current of the welding gun is adjusted within a range of 140A to 200A.
Preferably, magnetic lines of the longitudinal magnetic field pass through the magnetic induction coil and form a closed loop with the molten drop region.
Preferably, the method further comprises:
and adjusting the current of the excitation power supply and the welding current of the welding gun to change the transition frequency of the molten drop.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a method for promoting the shedding of a short-circuit transition molten drop in carbon dioxide gas shielded welding, which is applied to a molten drop form control device of carbon dioxide gas shielded welding, wherein the molten drop form control device comprises a magnetic induction coil, an excitation power supply, a welding gun and a control system; the excitation power supply is connected with the magnetic induction coil, the magnetic induction coil is arranged at the end part of the welding gun, and the control system is connected with the output end of the welding gun; the method comprises the following steps: supplying power to a magnetic induction coil by using the excitation power supply so that the magnetic induction coil generates a longitudinal magnetic field to a molten drop area; detecting a welding arc voltage signal of the welding gun by using a control system, and controlling the excitation power supply to supply power to the magnetic induction coil when the welding arc voltage signal rises; when the welding arc voltage signal has a falling edge, controlling the excitation power supply to stop supplying power to the magnetic induction coil; the magnetic induction coil generates the longitudinal magnetic field when the current of the excitation power supply is introduced; the longitudinal magnetic field exerts a Lorentz force on a droplet at the end of the welding wire of the welding gun, the Lorentz force acting on the dropletAnd twisting the molten drop to enable the molten drop to fall off. The invention is suitable for medium and large current CO 2 The gas shielded welding can improve the molten drop transition frequency and improve the working efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flow chart of a method in an embodiment provided by the present invention;
FIG. 2 is a schematic diagram of an apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic view of a magnetic induction coil in an embodiment of the present invention;
FIG. 4 is a schematic diagram of the distribution of magnetic field lines of a longitudinal magnetic field in an embodiment of the present invention;
FIG. 5 is a schematic diagram of current and magnetic field direction distributions in an embodiment provided by the present invention;
FIG. 6 is a schematic view of a droplet transfer process in an embodiment of the present invention;
FIG. 7 is a schematic view of a longitudinal magnetic field droplet force in an embodiment of the present invention;
fig. 8 is a waveform diagram of a single cycle in an embodiment provided by the present invention.
Description of reference numerals:
1-computer, 2-workbench, 3-laser backlight, 4-CO 2 The device comprises a welding power supply, a 5-Hall sensor, a 6-excitation power supply, a 7-welding gun, an 8-magnetic induction coil, a 9-welding wire, a 10-workpiece and a 11-high-speed camera.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a method for promoting the falling of short-circuit transition molten drops in carbon dioxide gas shielded welding, which can improve the molten drop transition frequency and improve the working efficiency.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a flowchart of a method in an embodiment of the present invention, and as shown in fig. 1, the present invention provides a method for promoting drop shedding in short-circuit transition of carbon dioxide arc welding, which is applied to a droplet shape control device for carbon dioxide arc welding, the droplet shape control device includes a magnetic induction coil, an excitation power supply, a welding gun and a control system; the excitation power supply is connected with the magnetic induction coil, the magnetic induction coil is arranged at the end part of the welding gun, and the control system is connected with the output end of the welding gun; the method comprises the following steps:
step 100: supplying power to the magnetic induction coil by using the excitation power supply so that the magnetic induction coil generates a longitudinal magnetic field to the molten drop region;
step 200: detecting a welding arc voltage signal of the welding gun by using a control system, and controlling the excitation power supply to supply power to the magnetic induction coil when the welding arc voltage signal has a rising edge; when the welding arc voltage signal has a falling edge, controlling the excitation power supply to stop supplying power to the magnetic induction coil; the magnetic induction coil generates the longitudinal magnetic field when the current of the excitation power supply is introduced; the longitudinal magnetic field exerts Lorentz force on a molten drop at the end of a welding wire of the welding gun, and the Lorentz force is used for twisting the molten drop so as to enable the molten drop to fall off.
Preferably, magnetic lines of force of the longitudinal magnetic field pass through the magnetic induction coil and form a closed loop with the droplet region.
Preferably, after step 200, the method further comprises:
step 300: and adjusting the current of the excitation power supply and the welding current of the welding gun to change the transition frequency of the molten drop.
As shown in fig. 2, the droplet shape control apparatus according to the present embodiment includes: the device comprises a computer 1 (with a built-in control system), a workbench 2, a laser backlight 3, a CO2 welding power supply 4, a Hall sensor 5, an excitation power supply 6, a welding gun 7, a magnetic induction coil 8 (magnetic head), a welding wire 9, a workpiece 10 and a high-speed camera 11. The control system is connected with a high-speed camera 11, a workpiece 10 is arranged on the workbench 2, and backlight laser irradiates the workpiece 10; and a welding wire 9 is arranged above the workpiece 10, the welding wire 9 is fixed by a welding gun 7, a magnetic induction coil 8 is further arranged at the end part of the welding gun 7, the welding gun 7 is connected with a Hall sensor 5, and the Hall sensor 5 is connected with a CO2 welding power supply 4.
Optionally, a cooling water tank is further disposed at the excitation power supply 6.
Based on the droplet shape control device in this embodiment, the specific implementation steps of this embodiment are as follows:
the method comprises the following steps: and (4) selecting materials. Selecting 400mm x 40mm x 5mm Q235 low-carbon steel as base material, H08Mn2Si welding wire 9 with diameter of 1.2mm, and selecting proper CO 2 Welding parameters of gas shielded welding including welding voltage, welding current, wire feed speed and CO 2 Shielding gas flow, etc.
Step two: and (6) wiring. Connecting the wiring of the CO2 welding power source 4; connecting the output end of the excitation power supply 6 to the two ends of the magnetic induction coil 8 to complete a closed loop; and the cooling water pipe is connected into the magnetic induction coil 8, so that the working state of the cooling water pipe is ensured.
Step three: and (6) debugging. And adjusting the position of the welding gun 7, fixing the position of the welding gun 7, and then adjusting high-speed shooting to enable the end part of the welding wire 9 to be positioned in the center of the lens, so that molten drops are displayed in the center of an image during welding, and the molten drop transition process is convenient to observe. And debugging the Hall sensor 5 to ensure that the waveform of the welding current and voltage is acquired.
Step four: and (6) welding. After welding process parameters (including welding current, welding voltage, welding speed and the like) are adjusted, a cooling circulation system and an excitation power supply 6 are started, the cooling circulation system continuously works in the welding process, and the magnetic induction coil 8 (magnetic head) is prevented from being damaged due to overheating.
Step five: a magnetic pulse is introduced. When detecting the sudden drop signal of the arc voltage, namely the short circuit starts, the excitation power supply 6 supplies power, and the magnetic induction coil 8 is electrified to generate a magnetic field; when the short circuit is completed as a result of detection of the arc voltage rise signal, the excitation power supply 6 stops supplying power, and the magnetic field stops being generated.
Step six: and (5) adjusting parameters. By changing the direction of the lorentz force. The magnitude of the magnetic induction intensity is changed by adjusting the magnitude of the exciting current output by the exciting power supply 6, and then the magnitude of the Lorentz force is changed, so that the stress state during molten drop transition is changed, and the purpose of accelerating molten drop transition is achieved.
The applied magnetic pulse is a longitudinal magnetic field, and a schematic diagram of the magnetic induction coil 8 (magnetic head device) is shown in fig. 3. The cylinder in the figure is the main part of the magnetic induction coil 8, the magnetic field is generated below the magnetic induction coil 8, and the magnetic lines of force are distributed as shown in fig. 4. The magnetic head is sealed and packed with insulating paper, and cooling water is introduced into the gap between the casing and the insulating paper to prevent the magnetic head from being burnt by overheat of the coil. The directional distribution of the current and the magnetic field is shown in fig. 5. The schematic diagram of the molten drop transition process under the longitudinal magnetic field of the magnetic field and the force-bearing schematic diagram are respectively shown in fig. 6 and fig. 7.
In the embodiment, Q235 low-carbon steel with the length of 400mm multiplied by 40mm multiplied by 5mm is selected as a base material in the test, an H08Mn2Si welding wire with the diameter of 1.2mm is adopted, the model of the welding machine is MAG-350RL, the excitation power supply 6 is formed by modifying the MCWE-315 welding machine, the dry elongation of the welding wire is 13mm, and the distance between the end part of the welding wire 9 and a workpiece is 1010 mm. According to the invention, the molten drop transition process is observed through high-speed camera equipment, and the current and voltage waveforms during welding are collected through the Hall sensor 5, so that the molten drop transition period and the molten drop transition frequency are calculated. Experimental results show that the application of a longitudinal magnetic field in the short circuit transition stage can obviously promote the drop shedding.
The waveform observed on the computer 1 is shown in fig. 8; according to the current voltage waveform of gathering, can calculate the molten drop transition cycle, can calculate molten drop transition frequency by the transition cycle, the molten drop transition frequency diverse that obtains under the different experimental parameters, experimental data is shown as table 1:
TABLE 1 change in the transition frequency of the molten droplets under the respective test parameters in the longitudinal magnetic field
According to the experimental data, the period of molten drop transition is obviously changed when the magnetic field parameters are reasonably matched, and particularly, as can be observed from fig. 8, after the magnetic pulse is introduced, the transition period of each molten drop becomes more similar, and the periods are approximately the same; the molten drop transition frequency also changes, the action effect of different magnetic field types on the molten drop frequency is different, and the molten drop transition frequency is 178.6Hz under the condition that the longitudinal magnetic field exciting current is 200A and the welding current is 180A. When the magnetic field parameters are reasonably matched, the invention can improve the molten drop transition frequency to different degrees, namely, the falling process of the molten drop is accelerated, and the aim of improving the welding efficiency is further achieved.
In this embodiment, four processes are included, which are specifically as follows:
(1) the magnetic field generating device, namely an excitation power supply 6 is electrified to generate excitation current which is transmitted to a magnetic induction coil 8 arranged at the end part of a welding gun 7 through a lead, and the magnetic induction coil 8 generates a magnetic field after being electrified so as to generate the magnetic field in a molten drop area;
(2) the longitudinal magnetic fields act on molten drops at the end part of the welding wire 9; magnetic force lines form a closed loop through the magnetic induction coil 8 and the molten drop area;
(3) the introduction of magnetic pulses is realized by detecting a welding arc voltage signal; when detecting the sudden drop signal of the arc voltage, namely the short circuit starts, the excitation power supply 6 supplies power, and the magnetic induction coil 8 is electrified to generate a magnetic field; when the rising signal of the arc voltage is detected, namely the short circuit is finished, the excitation power supply 6 stops supplying power, and the magnetic field stops generating;
(4) after the magnetic field is introduced, the radial component of the current in the short-circuit liquid bridge can generate Lorentz force under the action of an external longitudinal magnetic field, and tangential torsional force is generated on the molten drop. Thus, CO 2 The neck of the short-circuit liquid bridge is welded under the action of the torsional force of an external longitudinal magnetic field in addition to the action of the electromagnetic shrinkage force generated by gravity, surface tension, bursting force and welding current, so that the transition of molten drops is promoted. The Lorentz force generated by the magnetic field interacts with the force borne by the original molten drop, and the small liquid metal bridge at the joint of the molten drop and the welding wire 9 is more easily broken under the combined action, so that the molten drop is promoted to be transferred into a molten pool;
preferably, the range of adjustment of the excitation pulse current generated by the excitation power supply 6 is 100A to 200A. The welding current of the welding gun 7 is adjusted within a range of 140A to 200A.
The invention has the following beneficial effects:
the method of adding the synchronous electromagnetic pulse in the short circuit stage of the carbon dioxide gas shielded welding is adopted, the Lorentz force generated by the magnetic field is used for controlling the molten drop at the end of the welding wire, the stress state of the molten drop is changed, the molten drop is promoted to be transferred into a molten pool, the molten drop transfer frequency is improved to different degrees, and the lifting amplitude is different from 30Hz to 107 Hz.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the foregoing, the description is not to be taken in a limiting sense.
Claims (5)
1. A method for promoting the shedding of a short-circuit transition molten drop in carbon dioxide arc welding is characterized in that the method is applied to a molten drop form control device of the carbon dioxide arc welding, and the molten drop form control device comprises a magnetic induction coil, an excitation power supply, a welding gun and a control system; the excitation power supply is connected with the magnetic induction coil, the magnetic induction coil is arranged at the end part of the welding gun, and the control system is connected with the output end of the welding gun; the method comprises the following steps:
supplying power to the magnetic induction coil by using the excitation power supply so that the magnetic induction coil generates a longitudinal magnetic field to the molten drop region;
detecting a welding arc voltage signal of the welding gun by using a control system, and controlling the excitation power supply to supply power to the magnetic induction coil when the welding arc voltage signal has a rising edge; when the welding arc voltage signal has a falling edge, controlling the excitation power supply to stop supplying power to the magnetic induction coil; the magnetic induction coil generates the longitudinal magnetic field when the current of the excitation power supply is introduced; the longitudinal magnetic field exerts Lorentz force on a molten drop at the end of a welding wire of the welding gun, and the Lorentz force is used for twisting the molten drop so as to enable the molten drop to fall off.
2. The method for promoting the shedding of the short-circuit transition droplet in the carbon dioxide gas shielded welding according to claim 1, wherein the excitation pulse current generated by the excitation power supply is adjusted within a range of 100A to 200A.
3. The method for promoting carbon dioxide gas shielded welding short-circuit transition droplet shedding according to claim 1, wherein the welding current of the welding gun is adjusted within a range of 140A to 200A.
4. The method for promoting the shedding of the short-circuit transition molten drop in the carbon dioxide gas shielded welding according to claim 1, wherein magnetic lines of force of the longitudinal magnetic field pass through the magnetic induction coil to form a closed loop with the molten drop region.
5. The method for promoting carbon dioxide gas shielded welding short circuit transition droplet shedding according to claim 1, further comprising:
and adjusting the current of the excitation power supply and the welding current of the welding gun to change the transition frequency of the molten drop.
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