Control method for promoting dropping of molten drops

Abstract

The invention discloses a control method for promoting falling of molten drops. The control method comprises the steps that at least one laser generator is additionally arranged in the front end area of a welding gun; the position where the laser generator emits laser energy to a welding wire on the welding gun is obtained; laser energy is intermittently emitted to the welding wire through the laser generator in the feeding direction of the welding wire, so that a groove is formed in the surface of the welding wire; when the pulse current of the welding gun is output, molten drops are separated from the welding wire after necking down at the groove; according to the control method for promoting the molten drops to fall off, laser heating burning can be conducted on the welding wire in the basic value stage in the pulse welding process, so that a groove can be formed in the surface of the welding wire, after pulse current is output, the molten drops are necked at the groove of the welding wire, the surface tension of the contact face of the molten drops and the welding wire is reduced, and therefore the molten drops fall off better, and the welding quality is improved. The phenomenon of inconsistent molten drop transition such as multiple pulses and one drop is prevented, and the angles of the laser and the welding wire can be adaptively adjusted.

Description

Technical Field

[0001] This invention belongs to the field of welding technology, and in particular to a method for controlling the shedding of molten droplets. Background Technology

[0002] During metal arc welding (MAW), some welding wires, due to material properties or pulse energy mismatch, sometimes experience uneven droplet detachment in the low to medium current range, resulting in a "multiple pulses, one droplet" phenomenon. The larger droplet size then contacts the molten pool, creating a short circuit and generating significant spatter. In such cases, adjusting the pulse energy or changing the welding shielding gas sometimes fails to improve the situation.

[0003] During the welding reheating stage, it is beneficial for the welding wire tip to become pointed in order to facilitate smooth arc ignition next time. However, due to the material properties of some materials, it is difficult to make the welding wire tip into a pointed shape, but rather a spherical shape. In this case, it is not easy to guarantee the smoothness of the next arc ignition.

[0004] At the end of welding, sometimes the welding wire and the molten pool may stick together due to shaking of the welding torch or workpiece, or other interference. When welding is resumed next time, the workpiece will be dragged along when the welding torch is moved. In this case, the worker needs to use pliers to cut the welding wire before welding can start again.

[0005] At the start of welding, when the welding wire extends a long distance and the moment of arc ignition is not a contact arc ignition, the welding wire is prone to breakage, which will produce a large amount of spatter and may even block the contact tip. Summary of the Invention

[0006] Purpose of the invention: To provide a control method for promoting droplet detachment, which uses a laser generator to emit laser energy to form grooves on the surface of the welding wire to promote the detachment of droplets from the welding wire.

[0007] Technical solution:

[0008] A method for controlling droplet shedding includes:

[0009] At least one laser generator is added to the front end area of ​​the welding torch;

[0010] The laser generator performs a laser scan on the welding wire on the welding gun to obtain the position where the laser energy is emitted.

[0011] Based on the acquired position information, the laser generator intermittently emits laser energy toward the welding wire along the feeding direction of the welding wire, causing grooves to form on the surface of the welding wire;

[0012] When the welding torch outputs a pulsed current, the molten droplet forms a neck at the groove and then detaches from the welding wire.

[0013] In some possible embodiments, the laser generator is mounted on a mounting component, which is used to adjust the position and angle between the laser generator and the welding wire.

[0014] In a further embodiment, the angle between the laser beam generated by the laser generator emitting laser energy and the welding wire is 20°-70°.

[0015] In a further embodiment, the laser generator does not output energy before the pulsed current is output;

[0016] After the pulsed current is output, the frequency of emitting the laser energy is consistent with the frequency of droplet transition, and the frequency of emitting the laser energy is adjusted within the range of 20-400Hz.

[0017] In a further embodiment, the laser energy is emitted at time t1 before the pulse current is output;

[0018] When the laser energy is applied for a duration of time t1, the pulse current is in the base value stage;

[0019] Wherein, time t1 is 0.1-5ms before the pulse current output.

[0020] In a further embodiment, the process of emitting laser energy onto the welding wire via the laser generator to form grooves on the surface of the welding wire further includes:

[0021] The depth of the groove is changed by altering the magnitude of the laser energy, which is specifically represented as follows:

[0022] E = P_peak * τ;

[0023] Where E is the energy of a single laser pulse, P_peak is the peak power, and τ is the pulse width;

[0024] The wavelength of the laser energy is in the range of 1000-1100nm.

[0025] In a further embodiment, when the laser energy output is at its maximum, the depth of the groove formed on the welding wire is 1 / 2 of the welding wire diameter, and when the laser energy output is at its minimum, the depth of the groove formed on the welding wire is 1 / 8 of the welding wire diameter.

[0026] In a further embodiment, the welding torch has two laser generators at its front end, which are symmetrically arranged on both sides of the welding wire to emit laser energy onto the welding wire simultaneously or alternately.

[0027] In a further embodiment, the laser generator is also used to output preset laser energy to heat and burn the welding wire in at least three preset scenarios that occur during the reheating stage.

[0028] At least three preset scenarios are defined as a first scenario, a second scenario, and a third scenario;

[0029] The preset laser energy includes a first preset energy, a second preset energy, and a third preset energy.

[0030] In a further embodiment, in the first scenario, after each burn-back pulse output, the laser generator outputs the first preset energy to burn off the welding wire;

[0031] In the second scenario, when the wire sticking phenomenon occurs, the laser generator outputs the second preset energy to burn off the welding wire;

[0032] In the third scenario, when the arc-starting wire phenomenon occurs, the laser generator outputs the third preset energy to soften or burn off the welding wire.

[0033] The beneficial effects of this invention are as follows: This invention can perform laser heating and burning on the welding wire during the baseline stage of pulse welding, leaving grooves on the surface of the welding wire. After the pulse current is output, the molten droplet forms a neck at the groove, reducing the surface tension of the contact surface between the molten droplet and the welding wire, thereby allowing the molten droplet to detach better and preventing inconsistent droplet transition phenomena such as multiple pulses resulting in a single droplet. The angle between the laser and the welding wire can be adjusted, and the laser burning of the welding wire can be effective during each droplet transition, or it can only be effective when encountering difficulties in droplet transition. Attached Figure Description

[0034] Figure 1 This diagram illustrates the large splashing that occurs when the molten droplets do not detach smoothly in existing technologies.

[0035] Figure 2 This is a schematic diagram of the assembly structure of the laser generator and welding torch of the present invention.

[0036] Figure 3 This is a schematic diagram of the state of the welding wire groove after laser emission energy according to the present invention.

[0037] Figure 4 This is a schematic diagram illustrating how different laser emission energies create grooves of varying depths on the welding wire.

[0038] Figure 5 This is a schematic diagram of the groove generated by the two sets of laser generators working in a collaborative mode according to the present invention.

[0039] Figure 6 This is a schematic representation of the energy required to promote droplet detachment in this invention.

[0040] Figure 7 This is the first preset energy representation intention of the present invention.

[0041] Figure 8 This is the third preset energy representation intention of the present invention.

[0042] The attached figures are labeled as follows: 1. Welding torch; 2. Conductive nozzle; 3. Welding wire; 4. Laser generator; 5. Nozzle; 6. First fastening device; 7. Second fastening device; 8. First telescopic assembly; 9. Second telescopic assembly; 10. Angle adjustment assembly. Detailed Implementation

[0043] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0044] The present invention will be further described in detail below with reference to the accompanying drawings.

[0045] During gas metal arc welding (GMAW), some welding wires, due to material properties or pulse energy mismatch, sometimes experience uneven droplet detachment in the low to medium current range, resulting in a phenomenon of multiple pulses producing only one droplet. Figure 1 As shown, the molten droplet did not fall off after the first pulse output, and the molten droplet continued to grow after the second pulse output. At the peak of the third pulse, the larger molten droplet at the tip of the welding wire short-circuited with the molten pool for a short time. Due to the high current, a significant and violent explosion occurred, resulting in large spatter.

[0046] Example 1: As disclosed in this example, a method for controlling droplet detachment is provided by adding at least one laser generator 4 to the front end region of the welding torch 1; such as... Figure 2 As shown, the laser generator 4 is set at the front end of the welding torch 1 and at a certain angle to the welding wire 3. The laser generator 4 emits energy to the welding wire 3 located outside the conductive nozzle 2. Specifically, the front end refers to the area within a radius of 5-50cm around the nozzle 5 of the welding torch 1.

[0047] Preferably, the power range of the laser generator is generally selected between 300-500W. The relationship between power selection and the diameter and material of the welding wire is detailed in [reference needed]. Figure 6 .

[0048] The laser generator 4 performs a laser scan on the welding wire 3 on the welding torch 1 to obtain the position for emitting laser energy. After scanning the position of the welding wire 3, if the conductive tip 2 protrudes from the nozzle 5, the starting position for emitting laser energy is about 10 mm from the root of the scanned conductive tip 2; if the conductive tip 2 does not protrude from the nozzle 5, the starting position for emitting laser energy is about 5 mm from the root of the scanned nozzle 5.

[0049] The welding wire 3 is fed in the front end area. According to the obtained position information, the laser generator 4 intermittently emits laser energy towards the welding wire 3 along the feeding direction of the welding wire 3, so that grooves are formed on the surface of the welding wire 3.

[0050] Specifically, after the specific position of the welding wire 3 is determined by laser scanning, the laser generator 4 waits for the signal transmitted by the welding power source. This signal is the signal before pulse output, that is, at time t1 before pulse output, the laser generator 4 receives the signal from the power source and begins to emit laser energy.

[0051] The interval between laser energy emission is adjusted according to the pulse frequency, and the laser energy emission is adjusted according to the diameter of the welding wire 3. When the welding conditions such as material, wire diameter, and gas are selected before welding, the emitted laser energy already has a corresponding value.

[0052] When the welding torch 1 outputs a pulsed current, the molten droplet forms a neck at the groove and then detaches from the welding wire 3. Experiments have shown that adding serrations to the wire feed wheel mechanically presses the welding wire 3 out of the groove. This would cause wear on the conductive nozzle 2 when the wire 3 passes through it. In this application, after the welding wire 3 is fed out of the conductive nozzle 2, the laser generator 4 emits laser energy outside the conductive nozzle 2, causing a groove to form on the welding wire 3. This prevents the groove on the surface of the welding wire 3 from passing through the conductive nozzle 2. Therefore, when the pulsed current is output, a molten droplet forms at the tip of the welding wire 3. The droplet easily necks at the groove, facilitating a smooth transition of the droplet and preventing wear on the conductive nozzle 2 caused by the groove on the surface of the welding wire 3.

[0053] The laser energy is emitted at time t1 before the pulsed current is output. Figure 3 As shown in ①, when the laser energy's action time is at time t1, the pulse current is in the base value stage to prevent the laser beam from affecting the pulse arc. The waveform control of the pulse arc is mainly divided into the base value stage and the peak value stage. The output current is relatively small in the base value stage and relatively large in the peak value stage, which generates the pulse arc. Since the output current in the base value stage is relatively small and only serves to maintain the arc, the interference of the laser beam emitted by the laser generator 4 on the arc is small in the base value stage. Figure 3As shown in ②, a molten droplet forms at the tip of the welding wire 3 during the falling edge of the pulse current output, and a necking occurs at the groove of the welding wire 3; as Figure 3 As shown in ③, when the pulse current re-enters the base value stage, the droplet necking breaks and smoothly transitions into the molten pool;

[0054] Wherein, time t1 is 0.1-5ms before the pulse current output.

[0055] When no electric arc is generated during the slow wire feeding stage, that is, before the pulse current is output, the laser generator does not output energy;

[0056] After the electric arc is generated, the frequency of the laser energy emitted is consistent with the frequency of droplet transition. That is, after the pulse current is output, the frequency of the laser energy emitted is consistent with the frequency of droplet transition. The frequency of the laser energy emitted is adjusted within the range of 20-400Hz. This ensures that after each pulse output, the surface of the welding wire 3 has a groove corresponding to the current droplet transition moment, which is conducive to the smooth transition of the droplet.

[0057] The laser generator 4 emits laser energy to the welding wire 3, causing grooves to form on the surface of the welding wire 3, which further includes:

[0058] The depth of the groove is changed by altering the magnitude of the laser energy, which is specifically represented as follows:

[0059] E = P_peak * τ;

[0060] Where E is the energy of a single laser pulse, P_peak is the peak power, and τ is the pulse width;

[0061] The wavelength range of the laser energy is 1000-1100nm, with a preferred wavelength of 1070nm.

[0062] like Figure 4 As shown, E1 to E4 correspond to different groove depths, and the groove size formed by the output energy of welding wire 3 varies with different wire diameters. When the laser energy output is at its maximum, the depth of the groove formed on the welding wire 3 is 1 / 2 of the diameter of the welding wire 3. When the laser energy output is at its minimum, the depth of the groove formed on the welding wire 3 is 1 / 8 of the diameter of the welding wire 3.

[0063] Specifically, the energy table shows the correspondence between the groove depth and laser emission energy E for different welding wire diameters. The groove formed by the maximum laser output energy for different wire diameters is 1 / 2 the diameter of the welding wire, and the groove formed by the minimum laser output energy is 1 / 8 the diameter of the welding wire. Figure 6As shown, the energy table is a set of laser energies required to achieve different groove depths for welding wires 3 of different diameters, written into the software. The relationship between the laser energy, the diameter of welding wire 3, and the groove depth is verified through experiments to obtain the corresponding parameters. The laser energy can be determined through the energy table, and the laser pulse width can be adjusted according to the diameter of welding wire 3 and the required groove depth.

[0064] Furthermore, the laser energy's effect on the welding wire 3 can occur during each droplet transfer, or it can only occur when droplet transfer is difficult. For example, signals such as peak short circuits or prolonged short circuits can be detected by the welding machine itself. Peak short circuit detection methods include the welding machine considering a peak short circuit as occurring when the voltage reaches the short circuit determination voltage during the peak phase. Prolonged short circuit detection methods include considering a prolonged short circuit as occurring when the short circuit determination voltage is reached for a certain period of time.

[0065] Example 2: Based on Example 1, this example discloses a control method to promote droplet shedding. The laser generator 4 and the welding torch 1 are connected by a mounting component, which is used to adjust the position and angle between the laser generator 4 and the welding wire 3. Specifically, the mounting component is as follows: Figure 2 As shown, the mounting components include a first fastening device 6, a second fastening device 7, and a connecting device. The laser generator 4 is fixed on the first fastening device 6, the welding torch 1 is fixed on the second fastening device 7, and the first fastening device 6 and the second fastening device 7 are connected by the connecting device.

[0066] The connecting device includes a first telescopic component 8, a second telescopic component 9, and an angle adjustment component 10. The angle adjustment component 10 is connected to the first telescopic component 8 and the second telescopic component 9, respectively. The ends of the first telescopic component 8 and the second telescopic component 9 that are not connected to the angle adjustment component 10 are connected to the laser generator 4 and the welding torch 1, respectively.

[0067] The first fastening device 6 ensures that the laser generator 4 is in a stable state. Furthermore, the telescopic functions of the two telescopic components and the rotational adjustment function of the angle adjustment component 10 allow for the adjustment of the position and angle between the laser generator 4 and the welding wire 4. The specific mechanical structure of the mounting components is not limited here; any existing fixing, telescopic, and rotating parts capable of achieving the above functions are acceptable. The positioning spot of the laser generator 4 determines the adjustment position and angle, thereby achieving quantitative adjustment.

[0068] To avoid interference with the surrounding environment, the position of the laser generator 4 is adjusted. Specifically, if the conductive nozzle 2 protrudes from the nozzle 5, the starting position for the laser generator 4 to emit energy is about 10 mm from the root of the scanned conductive nozzle 2; if the conductive nozzle 2 does not protrude from the nozzle 5, the starting position for the laser generator 4 to emit energy is about 5 mm from the root of the scanned nozzle 5.

[0069] The angle between the laser beam generated by the laser generator 4 and the welding wire 3 when the laser energy is emitted is 20°-70°; preferably 45°.

[0070] Example 3: Based on Example 1, this example discloses a control method to promote droplet shedding. When the diameter of the welding wire 3 is relatively thick (e.g., 1.4mm-2.0mm), two laser generators 4 can be used to emit laser beams to the welding wire 3 at the same time, which helps the droplet to transition smoothly. In addition, when the wire extension is long, if only one laser is applied, the welding wire 3 may be bent due to the single-sided groove. In this case, two laser generators 4 can emit laser beams alternately or simultaneously to avoid bending of the welding wire.

[0071] Specifically, the welding torch 1 has two laser generators 4 at its front end, which are symmetrically arranged on both sides of the welding wire 3 to simultaneously or alternately emit laser energy onto the welding wire 3; the effect of the two sets of laser generators 4 working simultaneously is as follows: Figure 5 As shown in E5, the effect of the two sets of laser generators 4 working alternately is as follows: Figure 5 As shown in E6.

[0072] The two laser generators 4 and the welding power source communicate via a coordination signal to achieve synchronous or alternating output of the two laser energies. The alternating emission time of the two laser generators 4 is also at time t1 before the pulse output.

[0073] Example 4: Based on Example 1, this example discloses a control method to promote droplet shedding. The laser generator 4 is also used in the first scenario to output a first preset energy to burn off the welding wire 3 after each burn-back pulse output, preventing the formation of a large molten ball at the tip of the welding wire 3 from affecting the next arc ignition. Alternatively, a camera system can be used to observe the formation of a large molten ball at the tip of the welding wire 3 before outputting laser energy, which is beneficial for smooth arc ignition the next time.

[0074] Specifically, the power range of the first preset energy meter is between 300-500W, and the time range is between 900-5000vs. The relationship between the first preset energy and the material, wire diameter, and gas is as follows: Figure 7 As shown.

[0075] Example 5: Based on Example 1, this example discloses a control method to promote droplet detachment. The laser generator 4 is also used in a second scenario where, when wire sticking occurs during back-burning, the laser generator 4 outputs a second preset energy to burn off the welding wire 3. Specifically, the second scenario generally occurs after back-burning, when the power supply outputs a low detection voltage. When the actual voltage is detected to be low, it indicates that wire sticking has occurred because the welding wire 3 and the base material are short-circuited. When the power supply detects the short circuit, the laser will output a larger energy to burn off the welding wire 3. The output energy is set to different values ​​according to different materials and wire diameters, and is pre-input into the welding machine through an expert program to heat and burn off the welding wire 3. This avoids wire sticking. When wire sticking occurs during back-burning, the laser emission energy is no longer limited by 1 / 2 or 1 / 8 of the diameter of the welding wire 3, but is a larger energy sufficient to burn off the welding wire 3.

[0076] Specifically, the second preset energy can be the same as the first preset energy. This is because the first preset energy is used to eliminate large molten balls at the tip of the welding wire, which requires burning off the welding wire with a laser to prevent such balls from forming. The second preset energy is also used to burn off the welding wire to solve the problem of wire sticking. Therefore, the first preset energy can be shared under the same conditions of material, wire diameter, and gas.

[0077] Example 6: Based on Example 1, this example discloses a control method to promote droplet shedding. The laser generator 4 is further used in the third scenario to output a third preset energy to soften or burn off the welding wire 3 when an arc-ignition failure occurs. When an arc-ignition failure occurs, the laser generator 4 can generate corresponding energy based on different materials and wire diameters, thereby softening or burning off the welding wire 3. The output energy is set to different values ​​according to different materials and wire diameters and is pre-input into the welding machine through an expert program. By increasing the laser energy, the surface of the welding wire 3 is heated and softened, or heated and burned off, thus preventing the welding wire 3 from breaking under contact arc-ignition conditions, or the contact tip 2 from burning off due to the breaking of the welding wire 3.

[0078] Specifically, the phenomenon of arc ignition failure can be identified through the power supply. There are two ways to identify it. One is through current and voltage signals. When the welding wire 3 contacts the oxide scale, no current is generated. Therefore, if no current is generated after the arc ignition signal is issued for a certain period of time, or if current is generated but the voltage remains low for a certain period of time, it can be determined that there is no normal arc ignition and it is also considered as arc ignition failure. The other way is to determine whether arc ignition failure is caused by the motor torque. When the motor torque increases to a certain value, it indicates that arc ignition failure has occurred.

[0079] Specifically, the power range of the third preset energy meter is between 300-500W, and the time range is between 600-3000vs. The relationship between the third preset energy and the material, wire diameter, and gas is as follows: Figure 8 As shown.

[0080] In this application, the laser generator 4 can be selected from Han's Laser's "HFM-500 series pulsed fiber laser". This laser first generates laser pulses of a specific shape and frequency from a low-power "seed source", and then injects this weak pulse signal into a multi-stage fiber amplifier for energy amplification, ultimately outputting a high-power laser pulse. Furthermore, in this application, the aforementioned laser can be used to achieve the effects of scanning positioning and laser beam emission. Alternatively, an external automatic positioning laser can be used for scanning positioning. If an external automatic positioning laser device is used, it can be installed on the mounting device together with a laser capable of emitting the corresponding power. Currently, the signal transmission technology between the two laser generators for scanning positioning and laser emission has achieved efficient and stable transmission through optoelectronic hybrid synchronization and structural innovation. This technology is relatively mature in the field of industrial measurement and positioning and has the capability for large-scale application; therefore, it will not be described in detail here.

[0081] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

[0082] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A method for controlling droplet detachment, characterized in that: include: At least one laser generator is added to the front end area of ​​the welding torch; The laser generator performs a laser scan on the welding wire on the welding gun to obtain the position where the laser energy is emitted. Based on the acquired position information, the laser generator intermittently emits laser energy toward the welding wire along the feeding direction of the welding wire, causing grooves to form on the surface of the welding wire; When the welding torch outputs a pulsed current, the molten droplet forms a neck at the groove and then detaches from the welding wire.

2. The method for controlling droplet detachment according to claim 1, characterized in that: The laser generator is mounted on the mounting component, which is used to adjust the position and angle between the laser generator and the welding wire.

3. The method for controlling droplet detachment according to claim 2, characterized in that: The angle between the laser beam generated by the laser generator when emitting laser energy and the welding wire is 20°-70°.

4. The method for controlling droplet detachment according to claim 1, characterized in that: Before the pulsed current is output, the laser generator does not output energy; After the pulsed current is output, the frequency of emitting the laser energy is consistent with the frequency of droplet transition, and the frequency of emitting the laser energy is adjusted within the range of 20-400Hz.

5. The method for controlling droplet detachment according to claim 1, characterized in that: The laser energy is emitted at time t1 before the pulse current is output; When the laser energy is applied for a duration of time t1, the pulse current is in the base value stage; Wherein, time t1 is 0.1-5ms before the pulse current output.

6. The method for controlling droplet detachment according to claim 1, characterized in that: The process of emitting laser energy onto the welding wire via the laser generator to form grooves on the surface of the welding wire further includes: The depth of the groove is changed by altering the magnitude of the laser energy, which is specifically represented as follows: E = P_peak * τ; Where E is the energy of a single laser pulse, P_peak is the peak power, and τ is the pulse width; The wavelength of the laser energy is in the range of 1000-1100nm.

7. The method for controlling droplet detachment according to claim 6, characterized in that: When the laser energy output is at its maximum, the depth of the groove formed on the welding wire is 1 / 2 of the welding wire diameter; when the laser energy output is at its minimum, the depth of the groove formed on the welding wire is 1 / 8 of the welding wire diameter.

8. The method for controlling droplet detachment according to claim 1, characterized in that: The welding torch has two laser generators at its front end, which are symmetrically arranged on both sides of the welding wire to emit laser energy onto the welding wire simultaneously or alternately.

9. The method for controlling droplet detachment according to claim 1, characterized in that: The laser generator is also used to output preset laser energy to heat and burn the welding wire in at least three preset scenarios that occur during the reheating stage. At least three preset scenarios are defined as a first scenario, a second scenario, and a third scenario; The preset laser energy includes a first preset energy, a second preset energy, and a third preset energy.

10. The method for controlling droplet detachment according to claim 9, characterized in that: In the first scenario, after each burn-back pulse is output, the laser generator outputs the first preset energy to burn off the welding wire; In the second scenario, when the wire sticking phenomenon occurs, the laser generator outputs the second preset energy to burn off the welding wire; In the third scenario, when the arc-starting wire phenomenon occurs, the laser generator outputs the third preset energy to soften or burn off the welding wire.

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