Arc Extinguishing Method, Device, Equipment and Storage Medium for Gas Metal Arc Welding

Abstract

The present application is applicable to the field of welding technology, and provides a method, device, equipment and storage medium for arc extinguishing in gas metal arc welding. The method includes, after the torch switch is turned off, adjusting the wire feeding speed and welding current according to a preset working mode until a first working point is obtained; wherein, the wire feeding speed at the first working point is much lower than the wire feeding speed during steady-state welding, and the welding current at the first working point is much lower than the welding current during steady-state welding; then obtaining the current load state, and adopting a corresponding arc extinguishing strategy according to the load state, wherein the load states include short circuit, arcing and no-load. This method first converts the steady-state welding process from running at a high-energy working point to running at a low-energy working point, and realizes the decoupled control of the wire feeding amount and the wire melting amount; then according to different load states, adopts corresponding arc extinguishing strategies, thereby eliminating possible adhesion at the end of the welding wire and residual metal balls at the end of the welding wire, and finally obtaining an ideal arc extinguishing result.

Description

Technical Field

[0001] This application belongs to the technical field of welding, and particularly relates to an arc extinguishing method, device, equipment and storage medium for gas metal arc welding. Background Art

[0002] During the arc extinguishing process of gas metal arc welding, when the torch switch is released, the wire feeder usually stops feeding wire immediately. After the wire feeder stops, the welding wire will continue to decelerate and feed for a period of time due to factors such as the mechanical inertia of the wire feeder, the coiling of the torch cable, the resistance in the wire feeding hose, and the wire speed at the stop moment. At this time, the feeding amount of the welding wire is a random variable and is difficult to accurately predict; at the same time, affected by factors such as the thermal inertia of the welding wire metal and the welding current, the melting amount of the end section of the welding wire is also a random variable.

[0003] Therefore, during the process of ending welding, if the melting amount of the welding wire is large, it will cause the end of the welding wire to condense into a ball, and even the arc may burn back along the welding wire for a long distance and burn out the contact tip; if the feeding amount of the welding wire is large, it may cause wire jamming or sticking. Ultimately, the arc extinguishing effect is not ideal, which not only deteriorates the arc starting condition during the next welding, but also cannot meet the requirements of highly reliable and high-quality automatic welding. Therefore, how to ensure an excellent arc extinguishing effect has become an urgent problem to be solved in gas metal arc welding. Summary of the Invention

[0004] In view of this, the embodiments of this application provide an arc extinguishing method, device, equipment and storage medium for gas metal arc welding to solve the technical problem of unsatisfactory arc extinguishing effect in the existing gas metal arc welding technology.

[0005] In a first aspect, the embodiments of this application provide an arc extinguishing method for gas metal arc welding, and the method includes:

[0006] After the torch switch is closed, adjust the wire feeding speed and welding current according to a preset working mode until a first working point is obtained; wherein, the wire feeding speed at the first working point is much less than the wire feeding speed during steady-state welding, and the welding current at the first working point is much less than the welding current during steady-state welding;

[0007] Obtain the current load state; wherein, the load state includes short circuit, arcing and no load;

[0008] According to the load state, adopt a corresponding arc extinguishing strategy.

[0009] In a feasible implementation manner of the first aspect, the adjusting the wire feeding speed and welding current according to a preset working mode until a first working point is obtained includes:

[0010] Reduce the wire feeding speed in multiple segments according to a preset working mode until the target wire feeding speed is obtained; wherein, the target wire feeding speed is the wire feeding speed at the first working point;

[0011] During the process of reducing the wire feeding speed, the welding current is determined according to the current wire feeding speed so that the welding current matches the wire feeding speed.

[0012] In a feasible implementation manner of the first aspect, after obtaining the first operating point, the method includes:

[0013] After operating at the first operating point for a first preset duration, a reverse wire drawing instruction is generated and executed;

[0014] After the welding voltage is converted to the no-load voltage and the no-load voltage is maintained for a second preset duration, wire feeding is restarted.

[0015] In a feasible implementation manner of the first aspect, the adopting a corresponding arc extinguishing strategy according to the current load state includes:

[0016] In the case where the load state is short circuit, the welding current is increased to remove the adhesion at the end of the welding wire;

[0017] Obtain the current speed of the end of the welding wire;

[0018] In the case where the speed of the end of the welding wire is negative, the welding current is set to zero and an end welding instruction is executed;

[0019] In the case where the speed of the end of the welding wire is positive, return to execute the step of obtaining the current load state.

[0020] In a feasible implementation manner of the first aspect, the adopting a corresponding arc extinguishing strategy according to the current load state includes:

[0021] In the case where the load state is no-load, return to execute the step of obtaining the current load state until a first duration is obtained; wherein, the first duration is the continuous duration of the no-load state;

[0022] In the case where the first duration is greater than a first threshold, an end welding instruction is executed.

[0023] In a feasible implementation manner of the first aspect, the adopting a corresponding arc extinguishing strategy according to the current load state includes:

[0024] In the case where the load state is arcing, the welding current is reduced to reduce the melting amount of the welding wire;

[0025] Return to execute the step of obtaining the current load state.

[0026] In a feasible implementation manner of the first aspect, the executing an end welding instruction includes:

[0027] Feed the wire at a preset speed and turn off the welding machine after the wire extension length meets the preset requirements.

[0028] In a second aspect, an arc extinguishing device for MIG welding provided by an embodiment of the present application includes:

[0029] An adjustment module, configured to adjust the wire feeding speed and welding current according to a preset working mode until a first working point is obtained after the torch switch is turned off; wherein, the wire feeding speed at the first working point is much smaller than the wire feeding speed during steady-state welding, and the welding current at the first working point is much smaller than the welding current during steady-state welding;

[0030] A load acquisition module, configured to acquire the current load state; wherein, the load state includes short circuit, arcing, and no-load;

[0031] An arc extinguishing execution module, configured to adopt a corresponding arc extinguishing strategy according to the load state.

[0032] In a third aspect, an arc extinguishing device for MIG welding provided by an embodiment of the present application includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of any method in the first aspect are implemented.

[0033] In a fourth aspect, a computer-readable storage medium provided by an embodiment of the present application stores a computer program. When the computer program is executed by a processor, the steps of any method in the first aspect are implemented.

[0034] In a fifth aspect, a computer program product provided by an embodiment of the present application causes a terminal device to execute the method in any one of the first aspects when the computer program product runs on the terminal device.

[0035] In the arc extinguishing method for gas metal arc welding provided by the embodiments of the present application, first, the wire feeding speed and the welding current are adjusted until the first working point is obtained. Since the wire feeding speed at the first working point is much smaller than the wire feeding speed during steady-state welding, and the welding current at the first working point is much smaller than the welding current during steady-state welding, it can be known that compared with the high-energy working point during steady-state welding, the first working point is a low-energy working point. When welding is performed at the first working point, the feeding amount of the welding wire (wire feeding speed) and the melting amount of the welding wire (welding current) are both very small dynamic variables, so that decoupled control of the feeding amount of the welding wire and the melting amount of the welding wire can be realized, and further, the matching of the feeding amount of the welding wire and the melting amount can be ensured. At the same time, when welding is performed at the first working point, according to different load states, corresponding arc extinguishing strategies are adopted, and the matching control of the melting amount of the welding wire and the feeding amount of the welding wire can be realized by controlling the change of the welding current and the wire feeding / wire withdrawing mode, so as to eliminate the possible adhesion between the end of the welding wire and the molten pool, or the excessive liquid metal remaining at the end of the welding wire (becoming metal balls after condensation), and obtain an ideal arc extinguishing result with no sticking of the welding wire end, no or almost no condensed balls, and no wire jamming, creating extremely favorable conditions for smooth arc starting during subsequent welding.

[0036] It can be understood that the beneficial effects of the second to fifth aspects above can be referred to the relevant descriptions in the first aspect above, and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0038] Figure 1 It is a schematic flow chart of an arc extinguishing method for gas metal arc welding provided by an embodiment of the present application;

[0039] Figure 2 It is a timing diagram of the arc extinguishing process for gas metal arc welding provided by an embodiment of the present application;

[0040] Figure 3 It is a schematic flow chart of an arc extinguishing method for gas metal arc welding provided by another embodiment of the present application;

[0041] Figure 4 It is a schematic structural diagram of an arc extinguishing device for gas metal arc welding provided by an embodiment of the present application;

[0042] Figure 5 It is a schematic diagram of the hardware composition of an arc extinguishing device for gas metal arc welding provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] In the following description, specific details such as specific system architectures, technologies, etc. are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.

[0044] The reference to "one embodiment" or "some embodiments" described in the specification of the present application means that specific features, structures, or characteristics described in connection with that embodiment are included in one or more embodiments of the present application. Thus, the statements "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc. that appear in different places in this specification do not necessarily all refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in another way. The terms "comprising", "including", "having", and their variants all mean "including but not limited to", unless otherwise specifically emphasized in another way.

[0045] The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be illustrated below by specific embodiments. It should be noted that the specific embodiments listed below can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0046] Figure 1 A schematic flow chart of the arc extinguishing method for gas metal arc welding provided in an embodiment of the present application is as Figure 1 shown, and the method includes:

[0047] S10. After the torch switch is turned off, adjust the wire feeding speed and welding current according to a preset working mode until a first working point is obtained.

[0048] In this embodiment, the wire feeding speed at the first working point is much lower than the wire feeding speed during steady-state welding, and the welding current at the first working point is much lower than the welding current during steady-state welding.

[0049] The purpose of this step is to achieve a smooth transition of the welding process from a high-energy working point to a low-energy working point, where the steady-state welding corresponds to the high-energy working point, and the first working point is the low-energy working point. Operating the welding process at the low-energy working point enables the feeding amount and melting amount of the welding wire to be better decoupled and independently controlled, so that the feeding amount and melting amount of the welding wire can be matched.

[0050] The specific implementation of this step is to achieve a combined decrease in wire feeding speed and welding current by adjusting the wire feeding speed and welding current; among them, during the adjustment process, the wire feeding speed matches the welding current.

[0051] In this embodiment, the preset working mode may include a plurality of adjustment modes sequentially set according to time sequence, as well as the adjustment method, adjustment amplitude, and adjustment speed of each adjustment mode. Among them, the adjustment methods include linear adjustment, step adjustment, and curve adjustment.

[0052] Optionally, adjusting the wire feeding speed and welding current according to the preset working mode until the first working point is obtained may include the following steps:

[0053] Step 1: Reduce the wire feeding speed in multiple segments according to the preset working mode until the target wire feeding speed is obtained; among them, the target wire feeding speed is the wire feeding speed of the first working point.

[0054] Exemplarily, the preset working mode includes 3 adjustment stages executed sequentially, namely the first adjustment stage, the second adjustment stage, and the third adjustment stage. These 3 adjustment stages all adopt linear adjustment, and the adjustment amplitude and adjustment speed of the wire feeding speed in each adjustment stage have been preset.

[0055] First, adjust the wire feeding speed according to the set parameters of the first adjustment stage (the adjustment amplitude and adjustment speed of the wire feeding speed), and reduce the high wire feeding speed to the medium-high set wire feeding speed that meets the requirements of this adjustment stage.

[0056] Then, adjust the wire feeding speed according to the set parameters of the second adjustment stage and the set parameters of the third adjustment stage in sequence until the target wire feeding speed is obtained.

[0057] Step 2: During the process of reducing the wire feeding speed, determine the welding current according to the current wire feeding speed so that the welding current matches the wire feeding speed.

[0058] During the process of reducing the wire feeding speed, the welding current also undergoes multiple segmented adjustments, and the number of adjustment times is the same as that of the wire feeding speed; for example, the wire feeding speed is adjusted in 3 segments, and correspondingly, the welding current is also adjusted 3 times.

[0059] In practical applications, after generating the wire feeding speed reduction instruction, due to the mechanical inertia of the wire feeder, the speed of the wire end will start to decrease according to the set adjustment method after a short delay. Therefore, in order to achieve the accurate coordination between the welding current and the wire feeding speed, the current can be reduced according to the same adjustment method as the wire feeding speed after a preset duration after generating the wire feeding speed adjustment instruction (that is, starting to adjust the wire feeding speed), and ensure that the current matches the current wire feeding speed.

[0060] S20. Obtain the current load state; wherein, the load state includes short circuit, arcing, and no load.

[0061] In this embodiment, a short circuit means that the end of the welding wire contacts the surface of the workpiece, and at this time, the welding voltage is characterized as the short - circuit voltage. Arcing means that there is a burning arc between the end of the welding wire and the surface of the workpiece, and at this time, the welding voltage is characterized as the arcing voltage; no load means that the end of the welding wire does not contact the surface of the workpiece and there is no burning arc, and at this time, the welding voltage is characterized as the no - load voltage.

[0062] In this embodiment, the current load state can be obtained according to the current welding voltage.

[0063] Exemplarily, if the welding voltage is less than or equal to the second threshold, it indicates that the current load state is a short circuit; wherein, the second threshold is the welding voltage value at the moment when the end of the welding wire contacts the working surface; for example, the first threshold is 13V.

[0064] If the welding voltage is greater than the second threshold and less than the third threshold, it indicates that the current load state is arcing; wherein, the third threshold is a relatively large welding voltage value when the welding wire is not burning, for example, the third threshold is 50V.

[0065] If the welding voltage is greater than or equal to the third threshold, it indicates that the current load state is no load.

[0066] It should be understood that during the steady - state welding process, the load state alternates between short circuit and arcing.

[0067] S30. Adopt the corresponding arc - extinguishing strategy according to the load state.

[0068] Different load states indicate different contact states between the end of the welding wire and the surface of the workpiece, different melting heat sources of the welding wire, and different purposes of the arc - extinguishing strategy. Therefore, different arc - extinguishing strategies should be adopted.

[0069] In this embodiment, the purpose of adopting the corresponding arc - extinguishing strategy is to control the melting amount of the welding wire and the feeding amount of the welding wire to achieve their matching. Specifically, it is reflected in controlling the change of the welding current and the wire feeding (withdrawing) mode to remove the possible adhesion between the end of the welding wire and the molten pool, or the excessive residual liquid metal (which becomes metal balls after condensation) at the end of the welding wire, so as to obtain an ideal arc - extinguishing result with no sticky wire at the end of the welding wire and no or almost no condensed balls.

[0070] Optionally, if the load state is a short circuit, the end of the welding wire will adhere to the workpiece after arc extinguishing. Therefore, the purpose of the corresponding arc - extinguishing strategy adopted is to remove the adhesion at the end of the welding wire.

[0071] In a feasible implementation, when the load state is short - circuit, increase the welding current to remove the adhesion at the end of the welding wire; and after removing the adhesion at the end of the welding wire (for example, after increasing the current for a preset duration), return to execute the step of obtaining the current load state, so as to adopt the corresponding arc - extinguishing strategy again according to the current load state until the end - welding instruction is executed when the conditions are met.

[0072] Optionally, if the load state is arcing, it means that the welding wire is still burning. If the arc is extinguished immediately, there may be a situation where the melting amount of the welding wire does not match the feeding amount of the welding wire, resulting in wire jamming, and due to thermal inertia (the heat on the welding wire), a ball with a larger diameter is formed at the end of the welding wire. Therefore, when the load state is arcing, the purpose of the corresponding arc - extinguishing strategy adopted is to reduce the melting amount of the welding wire.

[0073] In a feasible implementation, when the load state is arcing, reduce the welding current to reduce the melting amount of the welding wire; then return to execute the step of obtaining the current load state, so as to adopt the corresponding arc - extinguishing strategy again according to the current load state until the end - welding instruction is executed when the conditions are met.

[0074] In this implementation, when reducing the welding current, synchronously reduce the wire - feeding speed so that the melting amount of the welding wire matches the feeding amount of the welding wire.

[0075] Optionally, if the load state is no - load, it means that there is no arc between the end of the welding wire and the workpiece in the current state. However, due to thermal inertia, the welding wire is still being fed, and the welding - wire current is still being input, so there is a possibility that the load state will switch back to arcing or short - circuit. Therefore, it is necessary to judge the duration of the no - load state to determine whether the end - welding instruction can be executed.

[0076] In a feasible implementation, adopting the corresponding arc - extinguishing strategy according to the load state includes the following steps:

[0077] Step 1: When the load state is no - load, return to execute the step of obtaining the current load state until the first duration is obtained.

[0078] Among them, the first duration is the continuous duration of the no - load state.

[0079] During the welding process, due to the heat on the welding wire, the continuous movement of the welding wire (wire feeding or wire extraction), and the continuous input of the welding - wire current, the load state is changing in real - time. In this step, when the load state is no - load, set the welding current to a small value that is not enough to melt the welding wire, and then return to execute the step of obtaining the current load state in this embodiment. If the load state is still no - load, accumulate the time to obtain the accumulated duration; if the load state switches to short - circuit or arcing, then determine the current accumulated duration as the first duration.

[0080] Step 2: When the first duration is greater than the first threshold, execute the end-welding instruction.

[0081] In this step, the first threshold is a preset value. If the first duration is greater than the first threshold, it means that the welding wire is in an unloaded state within a relatively long time interval. Even if the welding wire is still being fed, the welding current is zero, and the load state will not switch back to the arcing or short-circuit state again, so the end-welding instruction can be executed; at this time, the molten metal at the end of the welding wire has been processed when the load state is short-circuit or arcing, so an ideal arc-extinguishing result can be obtained.

[0082] In this step, executing the end-welding instruction includes feeding the wire at a preset speed until the length of the wire extending out meets the preset requirements, and then turning off the welding machine.

[0083] In this embodiment, on the premise of ensuring the arc-extinguishing quality, in order to improve the arc-extinguishing efficiency, the reverse wire-drawing instruction can be executed after obtaining the first working point, and then according to the load state and the speed of the end of the welding wire, the corresponding arc-extinguishing strategy can be adopted.

[0084] In a feasible implementation manner, after obtaining the first working point, the method may include:

[0085] Step A: After running for the first preset duration at the first working point, generate and execute the reverse wire-drawing instruction.

[0086] The purpose of this step is to run for the first preset duration at the low-energy working point (the first working point) to stabilize the welding molten pool. During this process, the position of the welding torch can be kept stationary.

[0087] The first preset duration can be set by the user in advance.

[0088] After running for the first preset duration at the first working point, the welding machine generates the reverse wire-drawing instruction and sends the reverse wire-drawing instruction to the wire feeder, so that the wire feeder completes the wire-drawing operation according to the reverse wire-drawing instruction.

[0089] Among them, the reverse wire-drawing instruction includes the wire-drawing speed.

[0090] Step B: When the welding voltage is converted to the no-load voltage and the no-load voltage is maintained for the second preset duration, resume wire feeding.

[0091] After the wire feeder executes the reverse wire-drawing instruction, the speed of the end of the welding wire will first decrease to zero and then become negative, that is, start wire-drawing. At this time, the end of the welding wire will gradually move away from the surface of the workpiece. After reaching a certain distance, the arc between the end of the welding wire and the surface of the workpiece cannot be maintained, and the arc is temporarily extinguished. At this time, the welding voltage is converted to the no-load voltage. In the subsequent process of the end of the welding wire continuously moving away from the surface of the workpiece, the welding voltage always remains the no-load voltage.

[0092] Optionally, after maintaining the no-load voltage for a second preset duration, the welding machine regenerates and executes a wire feeding instruction to cause the end of the welding wire to feed towards the workpiece surface again.

[0093] Wherein, the second preset duration can be preset according to parameters such as the wire diameter to ensure the cooling of the welding wire while meeting the time limit of arc extinction.

[0094] In this embodiment, after the process of reverse wire extraction and re-wire feeding of the welding wire, the welding process is no longer the arc-short circuit alternating cycle mode during steady-state combustion, but a random droplet short-circuit state (excessive melting of the welding wire caused by thermal inertia). At this time, according to the load state of the welding and the speed of the end of the welding wire, a corresponding arc extinction strategy can be adopted to transfer the molten droplets to the molten pool, thereby obtaining an ideal arc extinction result.

[0095] For a clearer illustration of this embodiment, please refer to Figure 2 . Figure 2 This is the timing diagram of the arc extinction process of the MIG welding provided by the embodiment of the present application. As Figure 2 shown, line 1 is the wire feeding speed instruction, line 2 is the speed of the end of the welding wire, line 3 is the welding voltage, and line 4 is the welding current.

[0096] Before arc extinction (before time T1), it is a steady-state welding process. At this time, the welding process operates at a high-energy working point, and the welding machine controls the wire feeder to convey the welding wire to the workpiece at a set wire feeding speed. For example, the wire feeding speed is 6.0 mpm.

[0097] At time T1, the welding torch switch is turned off. After a period of delay, the wire feeder starts to reduce the wire feeding speed in multiple segments according to a preset working mode. As Figure 2 shown, the preset working mode includes 3 adjustment stages executed in sequence, namely the first adjustment stage, the second adjustment stage, and the third adjustment stage. Among them, the first adjustment stage is from T2 to T4, the second adjustment stage is from T4 to T5, and the third adjustment stage is from T5 to T6; all 3 adjustment stages adopt linear adjustment, and the adjustment amplitude and adjustment speed of the wire feeding speed in each adjustment stage have been preset.

[0098] At time T2, the speed of the end of the welding wire starts to decrease. At the end of the first adjustment stage (time T4), the welding working point smoothly decreases from the high-energy working point during steady-state welding to a medium-high energy working point (characterized by the speed of the end of the welding wire decreasing from 6.0 mpm to 4.0 mpm); then, the wire feeding speed is adjusted according to the set parameters of the second adjustment stage and the set parameters of the third adjustment stage in sequence, and the target wire feeding speed is obtained at time T6, for example: 1.2 mpm.

[0099] During the process of reducing the wire feeding speed, the welding current is also adjusted in multiple segments, and the number of adjustment times is the same as that of the wire feeding speed. Correspondingly, the welding current is also adjusted in 3 segments, namely from T3 to T4, from T4 to T5, and from T5 to T6, and the target welding current, that is, the welding current at the first working point, is obtained at the moment of T6; thus, the welding working point is smoothly converted from a high working point to a low working point in a closed-loop control manner.

[0100] As Figure 2 shown, in order to stabilize the molten pool, it runs at the first working point for a preset duration, and then a reverse wire drawing instruction is generated and executed at the moment of T7. At this time, the wire feeding speed instruction is negative. Due to the mechanical inertia of the wire feeder and the commutation time of the motor, after the welding machine sends a reverse wire drawing instruction to the wire feeder, the speed of the wire end needs to be delayed for a period of time, starts to decrease at the moment of T8, and decreases to zero at the moment of T9, and then becomes negative. At this time, the wire end will gradually move away from the workpiece surface. After reaching a certain distance, the arc between the wire end and the workpiece surface cannot be maintained, and the arc is temporarily extinguished. At this time, the welding voltage is converted to the no-load voltage (the welding current is basically zero). Subsequently, during the process of the wire end continuously moving away from the workpiece surface, the welding voltage always remains at the no-load voltage. After the welding voltage maintains this no-load voltage for a second preset duration, that is, at the moment of T 10 moment, the welding machine regenerates a wire feeding instruction and commands the wire feeder to execute this wire feeding instruction so that the wire end feeds back towards the workpiece surface again. Similarly, due to the mechanical inertia of the wire feeder and the commutation time of the motor, the speed of the wire end remains negative for a period of time and resumes to zero at the moment of T 11 moment, and then starts to feed wire again.

[0101] Between the moment of T7 and T 11 moment, the speed of the wire end realizes the change of wire feeding - wire drawing - re - wire feeding, converting the welding process from an arc - short - circuit alternating cycle mode to a random droplet short - circuit state. During this working process, on the one hand, the welding machine has enough time to judge the load state by monitoring the welding voltage, and on the other hand, it can also control the wire to hold, feed or retract by monitoring the speed of the wire end, so that the welding current matches the speed of the wire end better.

[0102] Between the moment of T7 and T 11 moment, the welding machine obtains the load state in real - time and adopts a corresponding arc - extinguishing strategy according to the load state and the speed of the wire end.

[0103] Specifically, if the load state is a short - circuit, the welding current is increased to clear the short - circuit adhesion. After removing the adhesion at the wire end (for example, after increasing the current for a preset duration), return to execute the step of obtaining the current load state to adopt a corresponding arc - extinguishing strategy again according to the current load state until the end - welding instruction is executed when the conditions are met.

[0104] If the load state is arcing, reduce the welding current to decrease the wire melting amount; then return to execute the step of obtaining the current load state, and again adopt the corresponding arc extinguishing strategy according to the current load state until the end welding instruction is executed when the conditions are met.

[0105] If the load state is no-load, set the welding current to a small value insufficient to melt the wire end, then return to execute obtaining the load state until the duration of the load state being no-load is obtained, and when the duration is greater than the first threshold, execute the end welding instruction.

[0106] Among them, executing the end welding instruction includes feeding the wire at a preset speed until the wire extension length meets the preset requirement, and then turning off the welding machine to end the current welding process.

[0107] In the arc extinguishing method for gas metal arc welding provided by the embodiments of the present application, first adjust the wire feeding speed and the welding current until the first working point is obtained. Since the wire feeding speed at the first working point is much smaller than the wire feeding speed during steady-state welding, and the welding current at the first working point is much smaller than the welding current during steady-state welding, it can be known that compared with the high-energy working point during steady-state welding, the first working point is a low-energy working point. When operating the welding process at the first working point, both the feeding amount (wire feeding speed) of the wire and the melting amount (welding current) of the wire are very small dynamic variables, so that decoupled control of the feeding amount and the melting amount of the wire can be realized, and further the feeding amount and the melting amount of the wire can be ensured to match; at the same time, when welding at the first working point, according to different load states, adopt the corresponding arc extinguishing strategy, and the matching control of the wire melting amount and the wire feeding amount can be realized by controlling the change of the welding current and the wire feeding / withdrawing mode, so as to eliminate the possible adhesion between the wire end and the molten pool, or the excessive residual liquid metal (becoming metal balls after condensation) at the wire end, and obtain an ideal arc extinguishing result with no sticky wire at the wire end, no or almost no condensed balls, and no wire jamming; this creates extremely favorable conditions for stable arc starting during the next welding.

[0108] Figure 3 It is a schematic flow chart of the arc extinguishing method for gas metal arc welding provided by another embodiment of the present application. This figure describes Figure 1 A possible implementation manner of step 30 in the embodiment. As Figure 3 shown, adopting the corresponding arc extinguishing strategy according to the load state includes:

[0109] S301. In the case where the load state is short circuit, increase the welding current to remove the adhesion at the wire end.

[0110] S302. Obtain the current speed of the wire end.

[0111] Since the welding wire undergoes the processes of reverse wire drawing and re - wire feeding, the velocity of the welding wire end can be negative or positive.

[0112] Among them, when the velocity of the welding wire end is negative, it means that the welding wire end is moving away from the workpiece surface; when the velocity of the welding wire end is positive, it means that the welding wire end is feeding towards the workpiece.

[0113] S303. When the velocity of the welding wire end is negative, set the welding current to zero and execute the end - welding instruction.

[0114] When the velocity of the welding wire end is negative, it means that the welding wire end is moving away from the workpiece surface. At this time, ending the welding operation will not cause the welding wire end to stick again (the sticking of the welding wire end has been removed in step 301).

[0115] Similarly, because the welding wire undergoes the reverse wire - drawing process, the welding process is no longer the arc - short - circuit alternating cycle mode during steady - state combustion. Immediately after clearing the short - circuit (i.e., increasing the welding current to remove the sticking of the welding wire end), the welding current is set to zero, resulting in less thermal inertia, and thus the volume of the metal ball formed at the welding wire end is also smaller.

[0116] In this embodiment, the operation of ending the welding operation is the same as that in Figure 1 the embodiment and will not be elaborated here.

[0117] S304. When the velocity of the welding wire end is positive, return to execute the step of obtaining the current load state.

[0118] When the velocity of the welding wire end is positive, it means that the welding wire end is feeding. Therefore, after increasing the current to remove the sticking of the welding wire end, the load state of the welding wire may still become short - circuited again, that is, sticking may occur again. So it is necessary to return to execute the step of obtaining the current load state, and adopt the corresponding arc - extinguishing strategy according to the current load state until the end - welding instruction is executed when the conditions are met.

[0119] It should be understood that the magnitudes of the sequence numbers of the steps in the above - mentioned embodiments do not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0120] Based on the arc - extinguishing method for gas - metal arc welding provided by the above - mentioned embodiments, the embodiments of the present invention further provide an apparatus embodiment for implementing the above - mentioned method embodiments.

[0121] Figure 4 This is a schematic structural diagram of an arc - extinguishing device for gas - metal arc welding provided by an embodiment of the present application. As Figure 4 shown, the arc - extinguishing device 40 for gas - metal arc welding includes:

[0122] The adjustment module 401 is used to adjust the wire feeding speed and the welding current according to a preset working mode until a first working point is obtained after the welding torch switch is turned off; wherein, the wire feeding speed at the first working point is much lower than the wire feeding speed during steady-state welding, and the welding current at the first working point is much lower than the welding current during steady-state welding;

[0123] The load acquisition module 402 is used to acquire the current load state; wherein, the load state includes short circuit, arcing and no-load;

[0124] The arc extinguishing execution module 403 is used to adopt a corresponding arc extinguishing strategy according to the load state.

[0125] Optionally, the adjustment module 401 adjusts the wire feeding speed and the welding current according to a preset working mode until a first working point is obtained, including:

[0126] Reducing the wire feeding speed in multiple segments according to a preset working mode until a target wire feeding speed is obtained; wherein, the target wire feeding speed is the wire feeding speed at the first working point;

[0127] During the process of reducing the wire feeding speed, determine the welding current according to the current wire feeding speed so that the welding current matches the wire feeding speed.

[0128] Optionally, the arc extinguishing device 40 for gas metal arc welding further includes an operation control module, and the operation control module is used to generate and execute a reverse wire drawing instruction after operating at the first working point for a first preset duration;

[0129] After the welding voltage is converted to the no-load voltage and the no-load voltage is maintained for a second preset duration, wire feeding starts again.

[0130] Optionally, the arc extinguishing execution module 403 adopts a corresponding arc extinguishing strategy according to the current load state, including:

[0131] In the case where the load state is a short circuit, increase the welding current to remove the adhesion at the end of the welding wire;

[0132] Obtain the current speed of the end of the welding wire;

[0133] In the case where the speed of the end of the welding wire is negative, set the welding current to zero and execute an end welding instruction;

[0134] In the case where the speed of the end of the welding wire is positive, return to execute the step of obtaining the current load state.

[0135] Optionally, the arc extinguishing execution module 403 adopts a corresponding arc extinguishing strategy according to the current load state, including:

[0136] When the load state is no-load, return to execute the step of obtaining the current load state until the first duration is obtained; wherein, the first duration is the continuous duration of the no-load state of the load.

[0137] When the first duration is greater than the first threshold, execute the end-welding instruction.

[0138] Optionally, the arc-extinguishing execution module 403 adopts a corresponding arc-extinguishing strategy according to the current load state, including:

[0139] When the load state is arcing, reduce the welding current to reduce the melting amount of the welding wire.

[0140] Return to execute the step of obtaining the current load state.

[0141] Optionally, the arc-extinguishing execution module 403 executes the end-welding instruction, including:

[0142] Feed the wire at a preset speed, and turn off the welding machine after the wire extension length meets the preset requirements.

[0143] Figure 4 The arc-extinguishing device for MIG welding provided by the illustrated embodiment can be used to execute the technical solutions in the above method embodiments, and its implementation principle and technical effects are similar, which will not be elaborated here in this embodiment.

[0144] Figure 5 It is a schematic diagram of an arc-extinguishing device for MIG welding provided by an embodiment of the present application. As Figure 5 shown, the arc-extinguishing device 50 for MIG welding includes: at least one processor 501, a memory 502, and a computer program stored in the memory 502 and executable on the processor 501. The arc-extinguishing device for MIG welding further includes a communication component 503, wherein the processor 501, the memory 502, and the communication component 503 are connected through a bus 504.

[0145] When the processor 501 executes the computer program, it implements the steps in the above-mentioned arc-extinguishing method embodiments for MIG welding, such as Figure 1 the steps S10 to S50 in the illustrated embodiment. Or, when the processor 501 executes the computer program, it implements the functions of each module / unit in the above-mentioned device embodiments, such as Figure 4 the functions of the illustrated modules 401 to 405.

[0146] Exemplarily, the computer program may be divided into one or more modules / units, which are stored in the memory 502 and executed by the processor 501 to complete the present application. One or more modules / units may be a series of computer program instruction segments capable of performing specific functions, and these instruction segments are used to describe the execution process of the computer program in the arc extinguishing device 50 for gas metal arc welding.

[0147] Those skilled in the art can understand that Figure 5 merely examples of the arc extinguishing device for gas metal arc welding, and do not constitute a limitation on the arc extinguishing device for gas metal arc welding. For example, the arc extinguishing device for gas metal arc welding may be a welding machine control system configured with a wire feeder.

[0148] The embodiment of the present application further provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps in the above-mentioned various method embodiments can be implemented.

[0149] The embodiment of the present application provides a computer program product. When the computer program product runs on the arc extinguishing device for gas metal arc welding, the arc extinguishing device for gas metal arc welding can implement the steps in the above-mentioned various method embodiments when executed.

[0150] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, to implement all or part of the processes in the above-mentioned embodiment methods of the present application, a computer program can be used to instruct relevant hardware to complete. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps in the above-mentioned various method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file or some intermediate form, etc. The computer-readable medium can at least include: any entity or device capable of carrying the computer program code to the photographing device / terminal device, recording medium, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal, and software distribution medium. For example, a USB flash drive, a mobile hard disk, a magnetic disk or an optical disc, etc. In some jurisdictions, according to legislation and patent practice, the computer-readable medium cannot be an electrical carrier signal and a telecommunication signal.

[0151] In the above embodiments, the descriptions of the various embodiments have their own focuses. For the parts not detailed or recorded in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0152] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of this application.

[0153] In the embodiments provided in this application, it should be understood that the disclosed device / network device and method can be implemented in other ways. For example, the device / network device embodiments described above are merely illustrative. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling, direct coupling, or communication connection between each other can be through some interfaces. The indirect coupling or communication connection of the device or unit can be in an electrical, mechanical, or other form.

[0154] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units. They can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0155] The above embodiments are only used to illustrate the technical solutions of this application, rather than to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included in the protection scope of this application.

Claims

1. A method for extinguishing the arc in gas metal arc welding, characterized in that the method Including: After the torch switch is turned off, adjust the wire feeding speed and welding current according to a preset working mode until a first working point is obtained; wherein, the wire feeding speed at the first working point is much less than the wire feeding speed during steady-state welding, and the welding current at the first working point is much less than the welding current during steady-state welding; Obtain the current load state; wherein, the load state includes short circuit, arcing and no-load; Adopt a corresponding arc extinguishing strategy according to the load state; After obtaining the first working point, the method includes: After running for a first preset duration at the first working point, generate and execute a reverse wire drawing instruction; after the welding voltage is converted to no-load voltage and the no-load voltage is maintained for a second preset duration, resume wire feeding; Adopt a corresponding arc extinguishing strategy according to the current load state, including: In the case where the load state is a short circuit, increase the welding current to remove the adhesion at the end of the wire; obtain the current speed of the end of the wire; in the case where the speed of the end of the wire is negative, set the welding current to zero and execute an end welding instruction; in the case where the speed of the end of the wire is positive, return to execute the step of obtaining the current load state; or, In the case where the load state is no-load, return to execute the step of obtaining the current load state until a first duration is obtained; wherein, the first duration is the continuous duration of the no-load state; in the case where the first duration is greater than a first threshold, execute an end welding instruction; or, In the case where the load state is arcing, decrease the welding current to reduce the amount of wire melting; return to execute the step of obtaining the current load state.

2. The arc extinguishing method for gas metal arc welding according to claim 1, characterized in that, The adjusting the wire feeding speed and welding current according to a preset working mode until a first working point is obtained includes: Reduce the wire feeding speed in multiple segments according to a preset working mode until a target wire feeding speed is obtained; wherein, the target wire feeding speed is the wire feeding speed at the first working point; During the process of reducing the wire feeding speed, determine the welding current according to the current wire feeding speed so that the welding current matches the wire feeding speed.

3. The arc extinguishing method for gas metal arc welding according to claim 1, characterized in that, The executing the end welding instruction includes: Feed the wire at a preset speed, and turn off the welding machine after the wire extension length meets the preset requirements.

4. An arc extinguishing device for gas metal arc welding, which is used to implement the method described in any one of claims 1 to 3, characterized in that the device Including: An adjusting module, configured to adjust the wire feeding speed and welding current according to a preset working mode after the torch switch is turned off until a first working point is obtained; wherein, the wire feeding speed at the first working point is much less than the wire feeding speed during steady-state welding, and the welding current at the first working point is much less than the welding current during steady-state welding; A load obtaining module, configured to obtain the current load state; wherein, the load state includes short circuit, arcing and no-load; An arc extinguishing execution module, configured to adopt a corresponding arc extinguishing strategy according to the load state.

5. An arc extinguishing device for gas metal arc welding, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, the steps of the method according to any one of claims 1 to 3 are implemented.

6. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 3 are implemented.

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