CN111299758A - Molten drop form control device and method for carbon dioxide gas shielded welding - Google Patents
Molten drop form control device and method for carbon dioxide gas shielded welding Download PDFInfo
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- CN111299758A CN111299758A CN201911292373.XA CN201911292373A CN111299758A CN 111299758 A CN111299758 A CN 111299758A CN 201911292373 A CN201911292373 A CN 201911292373A CN 111299758 A CN111299758 A CN 111299758A
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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
- B23K9/09—Arrangements or circuits for arc welding with pulsed current or voltage
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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
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Abstract
The invention discloses a molten drop form control device and method for carbon dioxide gas shielded welding, which adopts an excitation power supply to generate excitation pulse current, and supplies the excitation pulse current to a device arranged on CO through a lead2A magnetic induction coil on a gas shielded welding gun generates a magnetic field in a molten drop area at the end of a welding wire under the action of a transverse magnetic field magnetic conduction rod, and the generated magnetic field acts on the molten drop; magnetic lines of force of the magnetic field form a closed loop through the magnetic induction coil and the molten drop area; the on-off of the excitation pulse current is controlled by detecting the rising edge and the falling edge of the arc voltage signal, so that the synchronization with the welding process is realized; lorentz force generated by magnetic induction coil magnetic field interacts with original electromagnetic contraction force, spot pressure, plasma flow force, surface tension and the like of molten drop, and excitation pulse current and welding electricity are adjustedThe size of the flow changes the form of the molten drop, thereby improving the formation of the welding seam and improving the stability of the welding process. The device and the method are particularly suitable for large-current low-splashing CO2And (4) gas shielded welding.
Description
Technical Field
The invention relates to CO2The field of gas shielded welding, in particular to a molten drop form control device and method for carbon dioxide gas shielded welding.
Background
CO2The (carbon dioxide) gas shielded welding adopts pure CO2The gas is used as the shielding gas for the gas metal arc welding, and has the advantages of low cost, high efficiency, energy saving, rust resistance, strong crack resistance, low hydrogen, small welding deformation, suitability for all-position welding, convenience for realizing mechanization and automation and the like, so the gas metal arc welding is widely applied in modern industry. CO 22The gas shielded welding has several molten drop transition modes, such as short circuit transition, drop transition, and drop injection transition, among which the short circuit transition mode is most widely used. Short circuit transition CO2The problems of a large amount of metal splashing and poor weld forming exist in gas shielded welding, and one method for improving weld forming is to ensure that molten drops are uniformly and stably transferred into a molten pool. Many effective methods have been used to optimize droplet morphology, mainly involving droplet size studies. By way of introduction to the literature, CO2In the short circuit transition process of gas shielded welding, the size of the molten drop is inversely proportional to the welding current and directly proportional to the arc voltage, the size of the molten drop is reduced and then increased along with the increase of the dry extension of the welding wire, and the welding speed almost has no influence on the size of the molten drop. The literature reports that a welding wire melting model is established by performing mathematical processing on current signals in the welding process, the height of the arc energy is adjusted by controlling the width of the pulse current at the initial stage of arc burning, and the droplet size is monotonically increased along with the increase of the width of the arc burning pulse current, so that the droplet size is controlled. There is also literature on adding K to the wire2CO3(Potassium carbonate, Na)2CO3(sodium carbonate) and the likeThe material changes the arc form and the molten drop transition form, the arc root of the arc expands, the transition form changes from the original large particle transition into the fine particle transition, and the size of the molten drop is reduced. It can be seen that the current research on changing the size of the molten drop has achieved certain results, but the change of the shape of the molten drop is rarely reported. Relevant experiments show that the change of the shape of the molten drop can also improve the transition stability of the molten drop. Therefore, the research shows that the molten drop at the end of the welding wire is controlled, the form of the molten drop is changed from the original cone, spherical or ellipsoidal shape with a sharp corner into a semi-sphere and a rounded spherical or ellipsoidal shape without a sharp corner, and the method has important significance for improving the transition stability of the molten drop.
Disclosure of Invention
The invention aims to provide a molten drop form control device and method for carbon dioxide gas shielded welding, which aim to solve the problem that the prior art only optimizes the size of a molten drop and improves the transition stability of the molten drop in a limited way.
In order to achieve the purpose, the invention provides the following scheme:
a droplet form control device for carbon dioxide arc welding, comprising: excitation power supply device, magnetic head device, hall voltage sensor, and CO2A gas shielded welding machine; the excitation power supply device includes: an excitation power supply and a control system; the control system is respectively connected with the input end of the excitation power supply and the output end of the Hall voltage sensor; the output end of the excitation power supply is connected with a magnetic induction coil of the magnetic head device; the input end of the Hall voltage sensor and the CO2The output end of the gas shielded welding machine is connected and used for collecting the CO2The arc voltage signal of the output end of the welding machine is transmitted to the control system; the magnetic head device comprises a magnetic induction coil, a transverse magnetic field magnetic conducting rod and a magnetic induction coil protective shell; the magnetic induction coil is sleeved on the CO2A welding gun of the gas shielded welding machine; the magnetic induction coil protective shell is arranged outside the magnetic induction coil; the transverse magnetic field magnetic conduction rod is arranged on the outer side of the magnetic induction coil protective shell; excitation pulse current is generated by the excitation power supply and supplied through a leadThe magnetic induction coil is arranged on the welding gun, and a magnetic field is generated in a molten drop area at the end part of the welding wire of the welding gun under the action of the transverse magnetic field magnetic conduction rod; the generated magnetic field acts on the molten drop, and magnetic lines of force of the magnetic field form a closed loop through the magnetic induction coil and the molten drop area.
Optionally, the transverse magnetic field flux guide rod includes: a left magnetic conducting rod and a right magnetic conducting rod; one end of the left magnetic conducting rod is connected with the bottom of the magnetic induction coil protective shell; one end of the right magnetic conducting rod is connected with the top of the magnetic induction coil protective shell; the other end of the left magnetic conduction rod is opposite to the other end of the right magnetic conduction rod.
A droplet shape control method for carbon dioxide arc welding, which is based on the droplet shape control device for carbon dioxide arc welding, and comprises the following steps:
hall voltage sensor for collecting CO2The method comprises the following steps of (1) generating an arc voltage signal at the output end of a gas shielded welding machine, and sending the arc voltage signal to a control system;
the control system detects a rising edge and a falling edge of the arc voltage signal;
when the control system detects the rising edge of the arc voltage signal, the control system switches on the excitation power supply, and the excitation power supply provides excitation pulse current for the magnetic induction coil;
the magnetic induction coil generates Lorentz force when the excitation pulse current is introduced, and the Lorentz force generated by the excitation pulse current and the CO2Electromagnetic contraction force, spot pressure, plasma flow force and surface tension of a molten drop at the end of a welding wire of a welding gun of the gas shielded welding machine are interacted with each other to influence the form of the molten drop;
changing the shape of the molten drop by adjusting the sizes of the excitation pulse current and the welding current;
when the control system detects the falling edge of the arc voltage signal, the control system disconnects the excitation power supply, and the excitation power supply stops providing the excitation pulse current for the magnetic induction coil.
Optionally, the adjusting range of the excitation pulse current is 100-200A.
Optionally, the adjustment range of the welding current of the welding gun is 140-200A.
Optionally, the changing the form of the droplet by adjusting the excitation pulse current and the welding current includes:
and changing the shape of the molten drop from a conical shape, a spherical shape or an ellipsoidal shape with sharp corners into a semi-spherical shape or a rounded spherical shape or an ellipsoidal shape without sharp corners by adjusting the sizes of the excitation pulse current and the welding current.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses a molten drop form control device and method for carbon dioxide gas shielded welding, which adopts an excitation power supply device to generate excitation pulse current, and supplies the excitation pulse current to a CO (carbon dioxide) device through a lead2A magnetic induction coil on a gas shielded welding gun generates a magnetic field in a molten drop area at the end of a welding wire under the action of a transverse magnetic field magnetic conduction rod, and the generated magnetic field acts on the molten drop; magnetic lines of force of the magnetic field form a closed loop through the magnetic induction coil and the molten drop area; the on-off of the excitation pulse current is controlled by detecting the rising edge and the falling edge of the arc voltage signal, so that the synchronization with the welding process is realized; lorentz force generated by the magnetic field of the magnetic induction coil interacts with original electromagnetic shrinkage force, spot pressure, plasma flow force, surface tension and the like of the molten drop, and the shape of the molten drop is changed by adjusting the size of excitation pulse current and welding current, so that the weld forming is improved, and the stability of a welding process is improved. The device and the method are particularly suitable for large-current low-splashing CO2And (4) gas shielded welding.
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 schematic structural diagram of a droplet shape control device and an experimental device for carbon dioxide arc welding according to the present invention;
FIG. 2 shows a short-circuit transition CO provided by the present invention2And (3) a molten drop form change diagram in the presence/absence of excitation pulse current of gas shielded welding.
Description of the symbols:
the device comprises a computer 1, a workbench 2, a workpiece 3, a laser backlight source 4, a welding power supply 5, an excitation power supply device 6, a Hall voltage sensor 7, a welding gun 8, a magnetic induction coil protective shell 8, a magnetic induction coil 9, a welding wire 10, a transverse magnetic field magnetic conduction rod 11 and a high-speed camera 12.
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 molten drop form control device and method for carbon dioxide gas shielded welding, which aim to solve the problem that the prior art only optimizes the size of a molten drop and improves the transition stability of the molten drop in a limited way.
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 schematic structural diagram of a droplet shape control device and an experimental apparatus for carbon dioxide arc welding according to the present invention. As shown in fig. 1, a droplet form control apparatus for carbon dioxide arc welding includes: excitation power supply device 5, magnetic head device, hall voltage sensor 6, and CO2A gas shielded welding machine. The excitation electricityThe source device 5 includes: an excitation power supply and a control system. The control system is respectively connected with the input end of the excitation power supply and the output end of the Hall voltage sensor 6; the output end of the excitation power supply is connected with a magnetic induction coil 9 of the magnetic head device. The input end of the Hall voltage sensor 6 and the CO2The output end of the gas shielded welding machine is connected and used for collecting the CO2And the arc voltage signal of the output end of the welding machine is transmitted to the control system.
The magnetic head device comprises a magnetic induction coil 9, a transverse magnetic field magnetic conduction rod 11 and a magnetic induction coil protective shell 8; the magnetic induction coil 9 is sleeved on the CO2The welding gun of the gas shielded welding machine. The magnetic induction coil protective housing 8 is arranged on the outer side of the magnetic induction coil 9. The outside of magnetic induction coil protective housing 8 is provided with horizontal magnetic field magnetic conduction pole 11. The excitation power supply generates excitation pulse current, the excitation pulse current is supplied to a magnetic induction coil 9 arranged on the welding gun 7 through a lead, and a magnetic field is generated by acting on a molten drop area at the end part of a welding wire 10 of the welding gun 7 through the transverse magnetic field magnetic conduction rod 11; the generated magnetic field acts on the molten drop, and the magnetic line of force of the magnetic field forms a closed loop through the magnetic induction coil 9 and the molten drop area.
Specifically, the transverse magnetic field flux guide rod 11 includes: a left magnetic conducting rod and a right magnetic conducting rod; one end of the left magnetic conducting rod is connected with the bottom of the magnetic induction coil protective shell 8; one end of the right magnetic conducting rod is connected with the top of the magnetic induction coil protective shell 8; the other end of the left magnetic conduction rod is opposite to the other end of the right magnetic conduction rod.
The working process of the molten drop form control device is as follows:
(1) exciting pulse current is generated by exciting power supply and supplied to CO via wires2A magnetic induction coil 9 on a gas shielded welding gun generates a magnetic field in a molten drop area at the end part of a welding wire 10 under the action of a transverse magnetic field magnetic conduction rod 11;
(2) the generated magnetic field acts on the molten drop; magnetic lines of force of the magnetic field form a closed loop through the magnetic induction coil 9 and the molten drop area;
(3) the introduction of the excitation pulse current is completed by detecting an arcing signal in the welding current signal; and detecting a short-circuit signal in the current signal, cutting off excitation pulse current, and realizing control on the molten drop form, specifically, taking out an arc voltage signal from the output end of the welding machine, and connecting the arc voltage signal to a Hall voltage sensor 6. The output signal of the hall voltage sensor 6 is connected to the excitation power supply device 5. When the excitation power supply device 5 acquires a rising edge signal of the output (arc voltage) of the hall voltage sensor 6, the excitation power supply device 5 immediately provides excitation pulse current for the magnetic induction coil 9; when the excitation power supply device 5 acquires a falling edge signal of the output (arc voltage) of the hall voltage sensor 6, the excitation power supply device 5 immediately cuts off the excitation pulse current.
(4) Lorentz force generated by the electromagnetic pulse of the excitation pulse current interacts with original electromagnetic contraction force, spot force, plasma flow force, surface tension and the like on the molten drop to change the stress state of the molten drop together. The Lorentz force can thus be varied by adjusting the field pulse current magnitude of the field pulse current means 5, and by adjusting the CO2The electromagnetic shrinkage force, spot pressure and plasma flow force generated by the welding current of the welding gun 7 of the gas shielded welding machine change the stress state of the molten drop, and further change the form of the molten drop. Specifically, the magnetic induction intensity, the frequency of the magnetic pulse and the CO are adjusted by adjusting the magnitude of the exciting pulse current (100-200A)2The gas shielded welding molten drop transition frequency is kept consistent. The electromagnetic shrinkage force, the spot pressure and the plasma flow force are adjusted by adjusting the welding current (140-200A) of the welding gun 7.
Based on the molten drop form control device for carbon dioxide arc welding, the invention also provides a molten drop form control method for carbon dioxide arc welding, which comprises the following steps:
the Hall voltage sensor 6 collects CO2The method comprises the following steps of (1) generating an arc voltage signal at the output end of a gas shielded welding machine, and sending the arc voltage signal to a control system;
the control system detects a rising edge and a falling edge of the arc voltage signal;
when the control system detects the rising edge of the arc voltage signal, the control system switches on the excitation power supply, and the excitation power supply provides excitation pulse current for the magnetic induction coil;
the magnetic induction coil 9 generates a lorentz force when the excitation pulse current is introduced, and the lorentz force generated by the excitation pulse current and the CO2Electromagnetic contraction force, spot pressure and plasma flow force generated by welding current of a welding gun 7 of the gas shielded welding machine interact with surface tension of molten drops at the end part of a welding wire 10 of the welding gun 7 to influence the shapes of the molten drops;
changing the shape of the molten drop by adjusting the sizes of the excitation pulse current and the welding current; specifically, the shape of the molten drop is changed from a conical shape, a spherical shape or an ellipsoidal shape with sharp corners into a semi-spherical shape or a rounded spherical shape or an ellipsoidal shape without sharp corners by adjusting the sizes of the excitation pulse current and the welding current; the adjusting range of the excitation pulse current is 100-200A; the adjustment range of the welding current of the welding gun 7 is 140-200A.
When the control system detects the falling edge of the arc voltage signal, the control system disconnects the excitation power supply, and the excitation power supply stops providing the excitation pulse current for the magnetic induction coil 9.
The experimental verification steps of the device and the method are as follows:
the method comprises the following steps: q235 low-carbon steel with the thickness of 5mm is selected as a welding test piece in the experiment, and proper CO is selected2The welding process parameters of the gas shielded welding include welding current, welding voltage, wire feeding speed, shielding gas flow, dry elongation, and the distance from the end of the welding wire 10 to the workpiece.
Step two: and (6) wiring. Respectively connecting the positive electrode and the negative electrode of a welding machine to the welding gun 7 and the workpiece 2; connecting two output ends of an excitation power supply device 5 to two ends of a magnetic induction coil 9 to form a closed loop; the magnetic induction coil 9 is connected to a cooling water circulation system.
Step three: and (6) welding. The welding gun 7 is adjusted to a proper welding position and then is kept still, so that the molten drop shape can be conveniently shot. The worktable on which the workpiece is positioned moves at a corresponding speed after being matched with related parameters such as wire feeding speed and the like. The excitation power supply device 5 and the water cooling system are turned on.
Step four: and collecting molten drop forms. The position of the high-speed camera 12 is adjusted according to the position of the welding torch 7, the end of the welding wire 10 is placed at the center of the lens, and after the position of the high-speed camera 12 is fixed, the state of the molten drop is clearly observed by the computer 1.
Step five: introduction of electromagnetic magnetic pulses. Collecting CO2The arc signal of the gas shielded arc welding is transmitted to the excitation power supply device 5, the excitation power supply device 5 generates excitation pulse current after receiving the signal, and the excitation pulse current supplies to the magnetic induction coil 9 to generate a magnetic field. After the arc is over, the short circuit starts, the signal is fed back to the excitation power supply device 5 again, the excitation power supply device 5 stops supplying power, and the magnetic induction coil 9 stops generating the magnetic field. Whereby the introduction of the electromagnetic pulse is accomplished during the arcing process.
Step six: the magnitude of the Lorentz force is changed by adjusting the magnitude of the exciting pulse current and the magnitude of the magnetic induction intensity, so that the stress state of the molten drop is influenced, and the change of the molten drop form is realized.
The adjustment range of the welding current in the third step is 140-200A; the welding speed is 8 mm/s; and the adjusting range of the excitation pulse current in the sixth step is 100-200A.
Experiment and test results:
in the experiment, welding wires of H08Mn2Si grades with the diameter of 1.2mm are selected to weld Q235 low-carbon steel plates with the thickness of 5mm, the model of a welding machine MAG-350RL is adopted, an excitation power supply device adopts self-made MCWE-315, and the dry extension of the welding wires 10 is 14 mm. The invention observes and analyzes the form of the molten drop through the molten drop transition process shot by the high-speed camera 12.
FIG. 2 shows a short-circuit transition CO provided by the present invention2And (3) a molten drop form change diagram in the presence/absence of excitation pulse current of gas shielded welding. As shown in fig. 2, a complete one-cycle droplet transfer process of "arc stage-short end" is shown. Different experimental parameters (welding current, excitation pulse current)) The droplet morphology of (a) was varied, and the experimental data are shown in table 1:
TABLE 1 molten drop morphology and weld morphology under different experimental parameters
As is clear from the experimental results shown in FIG. 2 and Table 1, the short-circuiting transfer CO is performed by the droplet shape control apparatus and method for carbon dioxide arc welding according to the present invention2The molten drop of the gas shielded welding is changed into a semi-sphere and a round and smooth sphere or an ellipsoid without a sharp corner from the original cone, the spherical or the ellipsoid with the sharp corner, the welding seam forming is improved, the consistency of the molten drop shape and the size in each period of molten drop transition is improved, the splashing is reduced, and the stability of the welding process is improved.
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 above, the present disclosure should not be construed as limiting the invention.
Claims (6)
1. A molten drop form control device for carbon dioxide arc welding is characterized by comprising: excitation power supply device, magnetic head device, hall voltage sensor, and CO2A gas shielded welding machine; the excitation power supply device includes: an excitation power supply and a control system; the control system is respectively connected with the input end of the excitation power supply and the output end of the Hall voltage sensor; the output end of the excitation power supply is connected with a magnetic induction coil of the magnetic head device; the input end of the Hall voltage sensor and the CO2Gas protectionThe output end of the welding protecting machine is connected and used for collecting the CO2The arc voltage signal of the output end of the welding machine is transmitted to the control system; the magnetic head device comprises a magnetic induction coil, a transverse magnetic field magnetic conducting rod and a magnetic induction coil protective shell; the magnetic induction coil is sleeved on the CO2A welding gun of the gas shielded welding machine; the magnetic induction coil protective shell is arranged outside the magnetic induction coil; the transverse magnetic field magnetic conduction rod is arranged on the outer side of the magnetic induction coil protective shell; the excitation power supply generates excitation pulse current, the excitation pulse current is supplied to a magnetic induction coil arranged on the welding gun through a lead, and a magnetic field is generated in a molten drop area at the end part of the welding wire of the welding gun through the action of the transverse magnetic field magnetic conduction rod; the generated magnetic field acts on the molten drop, and magnetic lines of force of the magnetic field form a closed loop through the magnetic induction coil and the molten drop area.
2. The apparatus of claim 1, wherein the transverse magnetic flux bar comprises: a left magnetic conducting rod and a right magnetic conducting rod; one end of the left magnetic conducting rod is connected with the bottom of the magnetic induction coil protective shell; one end of the right magnetic conducting rod is connected with the top of the magnetic induction coil protective shell; the other end of the left magnetic conduction rod is opposite to the other end of the right magnetic conduction rod.
3. A droplet shape control method for carbon dioxide arc welding based on the droplet shape control device for carbon dioxide arc welding according to claim 1, comprising:
hall voltage sensor for collecting CO2The method comprises the following steps of (1) generating an arc voltage signal at the output end of a gas shielded welding machine, and sending the arc voltage signal to a control system;
the control system detects a rising edge and a falling edge of the arc voltage signal;
when the control system detects the rising edge of the arc voltage signal, the control system switches on the excitation power supply, and the excitation power supply provides excitation pulse current for the magnetic induction coil;
the magnetic induction coil generates Lorentz force when the excitation pulse current is introduced, and the Lorentz force generated by the excitation pulse current and the CO2Electromagnetic contraction force, spot pressure, plasma flow force and surface tension of a molten drop at the end of a welding wire of a welding gun of the gas shielded welding machine are interacted with each other to influence the form of the molten drop;
changing the shape of the molten drop by adjusting the sizes of the excitation pulse current and the welding current;
when the control system detects the falling edge of the arc voltage signal, the control system disconnects the excitation power supply, and the excitation power supply stops providing the excitation pulse current for the magnetic induction coil.
4. The method as claimed in claim 3, wherein the range of the excitation pulse current is 100-200A.
5. The method as claimed in claim 3, wherein the welding current of the welding torch is adjusted within a range of 140-200A.
6. The method for controlling a droplet shape in carbon dioxide arc welding according to claim 3, wherein the changing of the droplet shape by adjusting the magnitude of the excitation pulse current and the welding current specifically includes:
and changing the shape of the molten drop from a conical shape, a spherical shape or an ellipsoidal shape with sharp corners into a semi-spherical shape or a rounded spherical shape or an ellipsoidal shape without sharp corners by adjusting the sizes of the excitation pulse current and the welding current.
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| CN113857672A (en) * | 2021-10-25 | 2021-12-31 | 长沙理工大学 | High-strength steel thick plate narrow gap welding method and system based on paraxial laser-coaxial wire feeding-electromagnetic field cooperation |
| CN114226916A (en) * | 2021-12-14 | 2022-03-25 | 沈阳工业大学 | Device and method for improving surface forming precision of arc additive component |
| CN114939710A (en) * | 2022-06-15 | 2022-08-26 | 辽宁新远特种焊接技术有限公司 | Method for promoting falling of short-circuit transition molten drops in carbon dioxide gas shielded welding |
| CN116551137A (en) * | 2023-04-14 | 2023-08-08 | 成都艾格科技有限责任公司 | Suspension type steel rail flash welding and induction heat treatment integrated machine |
| CN118060668A (en) * | 2024-04-08 | 2024-05-24 | 沈阳工业大学 | Droplet control method and device for arc fuse additive manufacturing |
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| CN114939710A (en) * | 2022-06-15 | 2022-08-26 | 辽宁新远特种焊接技术有限公司 | Method for promoting falling of short-circuit transition molten drops in carbon dioxide gas shielded welding |
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