Welding control method and device, welding machine and storage medium

Abstract

The embodiment of the invention provides a welding control method and device, a welding machine and a storage medium, and relates to the technical field of automatic welding. The method comprises the steps that a control device of the welding machine monitors welding current in the welding process, the first moment is determined according to the real-time change rate of the welding current, and the first moment is the moment when a welding wire of the welding machine starts to make contact with a workpiece; welding voltage is monitored from the first moment, a second moment is determined according to the real-time change rate of the welding voltage, and the second moment is the moment when molten drops at the tail end of the welding wire are necked down; the third moment is determined according to the second moment, and arcing judgment is carried out from the third moment according to the welding voltage and the real-time change rate of the welding voltage, so that molten drop necking and arcing are accurately judged, the splashing problem caused by the necking process and the wire explosion problem caused by arcing misjudgment are effectively reduced, and the welding quality is improved. And factors causing instability in the welding process are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of automated welding, and in particular to a welding control method, device, welding machine and storage medium. Background Art

[0002] With the continuous development of science and technology, robot welding technology has been widely used, and the requirements for welding quality have also increased. Generally speaking, the higher the stability of the welding process, the better the welding quality.

[0003] Traditional short-circuit welding is very sensitive to the dry extension (i.e. the length of the welding wire), and it is generally necessary to control it within the range of 10 to 15 times the diameter of the welding wire. Otherwise, unstable welding may occur. However, in practical applications, due to the inability of some welding guns to reach certain positions, a longer dry extension has to be used, or even if the dry extension is within the range of 10 to 15 times the diameter of the welding wire, due to the small diameter of the welding wire and the large welding current, for example, when using 0.8mm welding wire for welding above 150A, the traditional method of judging the arcing state by the voltage size often leads to misjudgment. This is because in this case, the internal resistance of the welding wire is large, and the voltage drop on the welding wire is also large. When the voltage on the welding wire exceeds a certain value, the actual short-circuit state may be mistakenly judged as an arcing state. The short-circuit state is misjudged as an arcing state, which will cause the short-circuit time to be prolonged. At this time, the output power of the welding machine is mainly consumed on the welding wire, causing the welding wire to turn red and break, generating a large amount of spatter, and seriously affecting the quality of the weld. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a welding control method, device, welding machine and storage medium.

[0005] In order to achieve the above purpose, the technical solution adopted by the embodiment of the present invention is as follows:

[0006] In a first aspect, the present invention provides a welding control method, which is applied to a control device of a welding machine, and the method comprises:

[0007] Monitoring welding current during welding, and determining a first moment according to a real-time rate of change of the welding current, wherein the first moment is a moment when a welding wire of the welding machine begins to contact a workpiece;

[0008] Starting from the first moment, the welding voltage is monitored, and a second moment is determined according to a real-time change rate of the welding voltage, wherein the second moment is a moment when the molten droplet at the end of the welding wire undergoes necking;

[0009] A third moment is determined according to the second moment, and arcing judgment is performed starting from the third moment according to the welding voltage and the real-time change rate of the welding voltage.

[0010] Optionally, the step of determining the second moment according to the real-time rate of change of the welding voltage comprises:

[0011] The moment when the real-time change rate of the welding voltage is first monitored to be not less than the first preset change rate is taken as the second moment.

[0012] Optionally, the step of determining the third moment according to the second moment includes:

[0013] A moment that is after the second moment and that is a preset time length away from the second moment is taken as the third moment.

[0014] Optionally, the step of performing arcing judgment based on the welding voltage and the real-time change rate of the welding voltage starting from the third moment includes:

[0015] Starting from the third moment, if it is monitored within a preset time range that the welding voltage is not less than a preset voltage and the real-time change rate of the welding voltage is not less than a second preset change rate, arcing is determined.

[0016] Optionally, after determining the second moment according to the real-time rate of change of the welding voltage, the method further comprises:

[0017] At the second moment, the welding current is reduced to a preset current range corresponding to the welding wire to prevent the molten droplet at the end of the welding wire from splashing when the welding wire is necked.

[0018] Optionally, the method further comprises:

[0019] During the welding process, the welding current is monitored and arc breaking judgment is performed according to the welding current;

[0020] When determining arc breaking, an arc starting strategy is determined according to the duration of arc breaking, so that the welding machine resumes welding according to the arc starting strategy.

[0021] Optionally, when determining arc breaking, the step of determining an arc starting strategy according to the duration of arc breaking includes:

[0022] If the arc breaking duration is not greater than the preset arc breaking duration, the arc starting strategy is determined to start the arc according to the welding stage when the arc breaking occurs;

[0023] If the arc breaking duration is longer than the preset arc breaking duration, the arc starting strategy is determined as direct arc starting.

[0024] In a second aspect, the present invention provides a welding control device, which is applied to a control device of a welding machine, and the device comprises:

[0025] A monitoring module for monitoring welding current during welding;

[0026] A determination module, configured to determine a first moment according to a real-time change rate of the welding current, wherein the first moment is a moment when a welding wire of the welding machine begins to contact a workpiece;

[0027] The monitoring module is also used to monitor the welding voltage starting from the first moment;

[0028] The determination module is further used to determine a second moment according to the real-time change rate of the welding voltage, wherein the second moment is a moment when the molten droplet at the end of the welding wire undergoes necking;

[0029] The judgment module is used to determine a third moment according to the second moment, and to make an arcing judgment based on the welding voltage and the real-time change rate of the welding voltage starting from the third moment.

[0030] In a third aspect, the present invention provides a welding machine, comprising a control device, the control device comprising a processor and a memory, the memory storing machine executable instructions that can be executed by the processor, and the processor executing the machine executable instructions to implement the welding control method described in the first aspect above.

[0031] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the welding control method as described in the first aspect above.

[0032] The welding control method provided by the embodiment of the present invention includes: monitoring the welding current during the welding process, determining the first moment according to the real-time change rate of the welding current, the first moment is the moment when the welding wire of the welding machine begins to contact with the workpiece; monitoring the welding voltage from the first moment, determining the second moment according to the real-time change rate of the welding voltage, the second moment is the moment when the molten droplet at the end of the welding wire shrinks; determining the third moment according to the second moment, and performing arcing judgment according to the welding voltage and the real-time change rate of the welding voltage from the third moment. Since the embodiment of the present invention determines the second moment when the molten droplet at the end of the welding wire shrinks by monitoring the real-time change rate of the welding voltage from the first moment representing the moment when the welding wire of the welding machine begins to contact with the workpiece, and reduces the welding current at this moment to prevent the welding wire from being overheated, and determines the starting moment of arcing judgment according to the second moment, that is, the third moment, and performs arcing judgment according to the welding voltage and the real-time change rate of the welding voltage from the third moment, so as to accurately judge the necking of the molten droplet and arcing, effectively reducing the spatter caused by the necking process, and the wire explosion problem caused by the misjudgment of arcing, and reducing the factors causing the instability of the welding process.

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 A schematic structural diagram of a control device for a welding machine provided by an embodiment of the present invention is shown;

[0036] Figure 2 A schematic diagram of a welding control method provided by an embodiment of the present invention is shown. Figure 1 ;

[0037] Figure 3 A schematic diagram of a necking and arcing determination process provided by an embodiment of the present invention is shown;

[0038] Figure 4 A schematic diagram of a welding control method provided by an embodiment of the present invention is shown. Figure 2 ;

[0039] Figure 5 An arc starting strategy schematic diagram provided by an embodiment of the present invention is shown Figure 1 ;

[0040] Figure 6 An arc starting strategy schematic diagram provided by an embodiment of the present invention is shown Figure 2 ;

[0041] Figure 7 A functional unit block diagram of a welding control device provided by an embodiment of the present invention is shown.

[0042] Icon: 100 - control device; 110 - memory; 120 - processor; 200 - welding control device; 201 - monitoring module; 202 - determination module; 203 - judgment module. DETAILED DESCRIPTION

[0043] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0045] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0046] Please refer to Figure 1 , is a schematic diagram of a control device 100 of a welding machine. The control device 100 includes a memory 110 and a processor 120. The memory 110 and the processor 120 are electrically connected to each other directly or indirectly to achieve data transmission or interaction. For example, these components can be electrically connected to each other through one or more communication buses or signal lines.

[0047] The memory 110 is used to store programs or data. The memory 110 may be, but is not limited to, a random access memory (RAM), a read only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), etc.

[0048] The processor 120 is used to read / write data or programs stored in the memory 110 and execute corresponding functions.

[0049] It should be understood that Figure 1The structure shown is only a schematic diagram of the structure of the control device 100. The control device 100 may also include Figure 1 More or fewer components as shown, or with Figure 1 Different configurations are shown. Figure 1 Each component shown in the figure can be implemented by hardware, software or a combination thereof.

[0050] The following is an introduction to the welding control method of the control device 100 applied to the welding machine. Figure 2 As shown, the welding control method includes steps S101 to S103.

[0051] S101, monitoring the welding current during the welding process, and determining a first moment according to a real-time change rate of the welding current.

[0052] The first moment is the moment when the welding wire of the welding machine comes into contact with the workpiece.

[0053] Welding current-time curve Figure 3 As shown, the slope of the curve corresponding to each time point in the figure can represent the real-time change rate of the welding current.

[0054] During the welding process, when the molten droplet formed by the melted welding wire contacts the surface of the workpiece, the current path will suddenly shift from passing through the arc to passing through the contact point between the molten droplet and the workpiece. At this time, the welding current rises rapidly, forming a short circuit phenomenon.

[0055] The welding current rise is not uniform, but can be divided into the first stage and the second stage. The welding current rises faster in the first stage, which is reflected in the welding current-time curve as the curve slope becomes larger. The welding current rises slower in the second stage than in the first stage, which is reflected in the welding current-time curve as the curve slope becomes smaller.

[0056] According to the change of the slope of the welding current-time curve, the moment when the welding current rises from fast to slow is taken as the first moment. Figure 3 As shown, the first moment is t_neck. At t_neck, the slope of the curve changes from large to small, and the rise of the welding current changes from fast to slow.

[0057] S102, starting from the first moment, monitoring the welding voltage, and determining the second moment according to the real-time change rate of the welding voltage.

[0058] The second time is the time when the molten droplet at the end of the welding wire undergoes necking.

[0059] During the welding process, when the molten droplet separates from the end of the welding wire and transitions to the workpiece, a neck (or necking) will form between the droplet and the welding wire. The necking is the narrowing part of the droplet before it breaks off. It is the result of the combined effects of surface tension, electromagnetic force, gravity, and metal flow between the droplet and the welding wire.

[0060] In a possible implementation, the implementation process of step S102 may be to use the moment when the real-time change rate of the welding voltage is first monitored to be not less than the first preset change rate as the second moment.

[0061] The first preset change rate is determined according to the specification, material and welding requirements of the welding wire. For example, for a welding wire with a grade of ER50-6 and a diameter of 0.8 mm, the shielding gas during welding is 80% Ar and 20% CO. 2 In this case, the first preset change rate can be set to any value between 40 and 80 V / ms for a mixed gas with a gas flow rate of 15 L / min and a welding current of any size; for a welding wire with a grade of ER50-6 and a diameter of 1.2 mm, the shielding gas during welding is 80% Ar and 20% CO 2 In this case, the first preset change rate can be set to any value between 35 and 60 V / ms; for "the welding wire with the grade of ER50-6 and the diameter of 0.8 mm, the shielding gas during welding is 100% CO 2 In this case, the first preset change rate can be set to any value between 50 and 80 V / ms.

[0062] like Figure 3 As shown, the curve slope corresponding to each time point of the welding voltage-time curve can represent the real-time change rate of the welding voltage.

[0063] Starting from the first moment t_neck, according to the change of the slope of the welding voltage-time curve, such as Figure 3 As shown in the dotted circle with serial number ①, the moment when the slope of the curve first reaches the slope U_slop1 representing the first preset change rate is taken as the second moment.

[0064] In the implementation of the present invention, at the second moment, the welding current is reduced to a preset current range corresponding to the welding wire to prevent the molten droplet at the end of the welding wire from splashing when the welding wire is necked.

[0065] The preset current range is determined according to the specifications, material and welding requirements of the welding wire. For example, for a welding wire with a grade of ER50-6 and a diameter of 0.8 mm, the shielding gas during welding is 80% Ar and 20% CO.2 In this case, the preset current range can be set to 20-60A; for "the welding wire with the grade of ER50-6 and the diameter of 1.2mm, the shielding gas during welding is 80% Ar and 20% CO 2 In this case, the preset current range can be set to 35-70A; for "the welding wire with the grade of ER50-6 and the diameter of 0.8mm, the shielding gas during welding is 100% CO 2 Gas, gas flow rate is 15L / min, any size welding current" In this case, the preset current range can be set to 20~60A.

[0066] S103, determining a third moment according to the second moment, and starting from the third moment, performing arcing judgment according to the welding voltage and the real-time change rate of the welding voltage.

[0067] In a possible implementation, the implementation process of "determining the third moment according to the second moment" may be to use a moment that is after the second moment and has a preset time length from the second moment as the third moment.

[0068] The preset duration can be determined according to the specification, material and welding requirements of the welding wire. For example, for a welding wire with a grade of ER50-6 and a diameter of 0.8 mm, the shielding gas during welding is 80% Ar and 20% CO. 2 In this case, the preset duration can be set to any value between 400-900μs; for "the welding wire with the grade of ER50-6 and the diameter of 1.2mm, the shielding gas during welding is 80% Ar and 20% CO 2 In this case, the preset duration can be set to any value between 400-600μs; for "the welding wire with the grade of ER50-6 and the diameter of 0.8mm, the shielding gas is 100% CO 2 In this case, the preset duration can be set to any value between 300-600μs.

[0069] like Figure 3 As shown, the preset time length is T_wait, and the counting starts from the second moment, that is, when the molten droplet is determined to send a necking, when the time count reaches T_wait, that is, at t_arc, the arcing judgment starts. It can be understood that Figure 3 The t_arc in is the third moment.

[0070] Arcing refers to the process of establishing a stable electric arc between the welding wire and the workpiece. The welding wire is close to the surface of the workpiece to form a contact point. A sufficiently large current is applied to the welding wire and the workpiece through the power supply. When the current reaches a certain threshold, a plasma channel formed by ionized gas (such as ionization in the air) is generated between the welding wire and the workpiece, that is, an arc. A stable arc can provide continuous heat to melt the solder and form a weld.

[0071] In order to accurately judge arcing and avoid wire bursting problems caused by misjudgment of arcing, the implementation process of "arc burning judgment based on the welding voltage and the real-time change rate of the welding voltage starting from the third moment" in step S03 can be to start from the third moment. If it is monitored within the preset time range that the welding voltage is not less than the preset voltage and the real-time change rate of the welding voltage is not less than the second preset change rate, arcing is determined.

[0072] The arcing judgment in the embodiment of the present invention includes two parts: welding voltage judgment and real-time change slope judgment of the welding voltage.

[0073] Starting from the third moment, the size and real-time change rate of the welding voltage at each moment are monitored. If it can be simultaneously monitored at any moment that the size of the welding voltage is not less than the preset voltage and the real-time change rate of the welding voltage reaches the second preset change rate, arcing is determined.

[0074] It is understandable that if it is not simultaneously monitored that the welding voltage is not less than the preset voltage and the real-time change rate of the welding voltage reaches the second preset change rate, it cannot be determined that arcing is occurring.

[0075] Optionally, the preset voltage can be set to any value between 12 and 17 V, and the second preset change rate is determined according to the specification, material and welding requirements of the welding wire. For example, for a welding wire with a grade of ER50-6 and a diameter of 0.8 mm, the shielding gas during welding is 80% Ar and 20% CO 2 In this case, the second preset change rate can be set to any value between 150 and 250 V / ms for a mixed gas with a gas flow rate of 15 L / min and a welding current of any size; for a welding wire with a grade of ER50-6 and a diameter of 1.2 mm, the shielding gas during welding is 80% Ar and 20% CO 2 In this case, the second preset change rate can be set to any value between 120 and 200 V / ms; for "the welding wire with the grade of ER50-6 and the diameter of 0.8 mm, the shielding gas is 100% CO 2In this case, the second preset change rate can be set to any value between 200 and 300 V / ms.

[0076] like Figure 3 As shown, starting from the third moment t_arc, the slope change of the welding voltage-time curve is monitored, such as Figure 3 As shown in the dotted circle numbered ②, the slope of the curve reaches the slope U_slop2 representing the second preset change rate.

[0077] The embodiment of the present invention monitors the real-time change rate of the welding voltage starting from the first moment characterizing the moment when the welding wire of the welding machine begins to contact the workpiece, determines the second moment when the molten droplet at the end of the welding wire undergoes necking, reduces the welding current at this moment to prevent the welding wire from being overheated, determines the starting moment of arcing judgment based on the second moment, i.e., the third moment, and performs arcing judgment based on the welding voltage and the real-time change rate of the welding voltage from the third moment, thereby accurately judging the necking of the molten droplet and arcing, effectively reducing the spatter caused by the necking process and the wire bursting problem caused by misjudgment of arcing, and reducing the factors causing instability in the welding process.

[0078] Please refer to Figure 4 , the welding control method also includes steps S104 to S105.

[0079] S104, monitoring the welding current during the welding process, and making an arc breaking judgment based on the welding current.

[0080] Arc breaking refers to the situation where the arc is interrupted or unstable. This may be caused by a variety of reasons, including but not limited to: arc too long, current too low, poor gas flow, surface contamination of the workpiece, and wear of the wire or electrode.

[0081] The arc is too long: An arc that is too long may cause current dispersion, reduce local heating efficiency, and affect welding quality.

[0082] Current is too low: When the current is not enough to keep the arc burning, the arc may go out.

[0083] Poor gas flow: In gas shielded welding, if the shielding gas flow is not correct, it may interfere with the arc and cause it to break.

[0084] Workpiece surface contamination: Oil, oxide layer or other impurities on the workpiece surface may hinder the formation or stabilization of the arc.

[0085] Welding wire or electrode wear: Wear of the electrode or welding wire caused by long-term use may affect its conductive properties and cause arc breaking.

[0086] The welding current is monitored during the welding process, and a current threshold is set according to the welding parameters used and the needs of the application. When the welding current drops rapidly from the normal welding current value to below the set current threshold, it is the beginning time of arc breaking.

[0087] S105 determines an arc starting strategy according to the duration of arc breaking when determining arc breaking, so that the welding machine resumes welding according to the arc starting strategy.

[0088] Among them, after the arc is broken during the welding process, the welding current is continuously monitored to determine when the welding wire and the workpiece are in contact again, forming a new short circuit. It can be understood that when the welding wire and the workpiece are in contact again, the arc is broken and the welding current is short-circuited again, and the welding current quickly recovers from below the current threshold.

[0089] The start time of arc breaking is t_break, and the time of short circuit after arc breaking is t_short. Subtract t_break from t_short, and the result is the arc breaking duration T_break.

[0090] In a possible implementation, the implementation process of step S105 may include two situations.

[0091] In case 1, if the arc breaking duration is not greater than the preset arc breaking duration, the arc starting strategy is determined to start the arc according to the welding stage when the arc breaking occurs.

[0092] In case 2, if the arc breaking duration is longer than the preset arc breaking duration, the arc starting strategy is determined as direct arc starting.

[0093] The preset arc-breaking time is determined according to the specifications, material and welding requirements of the welding wire. For example, for a welding wire with a grade of ER50-6 and a diameter of 0.8 mm, the shielding gas during welding is 80% Ar and 20% CO. 2 In this case, the preset arc-breaking time can be set to any value between 10 and 50 ms; for "the welding wire with the grade of ER50-6 and the diameter of 1.2 mm, the shielding gas during welding is 80% Ar and 20% CO 2 In this case, the preset arc-breaking time can be set to any value between 20 and 60 ms; for "the welding wire with the grade of ER50-6 and the diameter of 0.8 mm, the shielding gas during welding is 100% CO 2 In this case, the preset arc-off time can be set to any value between 10 and 50 ms.

[0094] Record the preset arc-breaking duration as T, and determine the appropriate arc-starting strategy by comparing the magnitude relationship between T_break and T.

[0095] When T_break < T, that is, the arc-breaking occurrence time is short. At this time, determine the arc-starting strategy to start the arc according to the welding stage at the time of arc-breaking, that is, according to whether the arc-breaking occurs in the short-circuit stage or the arcing stage, and also start welding from the same stage when restarting.

[0096] As Figure 5 shown, if T_break < T and the arc-breaking occurs in the short-circuit stage, then restart welding also starts from the short-circuit stage.

[0097] When T_break > T, that is, the arc-breaking occurrence time is long. At this time, use pulsed current to directly start the arc to ensure that welding can quickly return to normal.

[0098] As Figure 6 shown, when T_break > T, directly start the arc with pulsed current. After arcing, exit the pulsed arc-starting. After exiting the pulsed arc-starting, the welding process directly enters the arcing stage.

[0099] Pulsed current arc-starting means using pulsed current instead of continuous DC current when starting the arc. Pulsed current means that the current is divided into two parts in one cycle, one part is the "peak value" of high current density (i.e., the "on" state), and the other part is the "off" state of low current density (i.e., the "off" state), which can effectively reduce spatter during arc-starting and improve the success rate of arc-starting, especially for materials or conditions that are difficult to start the arc.

[0100] After pulsed current arc-starting, there is no additional transition stage, and it directly enters the stable arc combustion stage for welding. When the arc is successfully established and starts to burn stably (i.e., the "arcing" stage), stop using pulsed current for welding and switch to using conventional DC current for welding.

[0101] It should be noted that when restarting welding, the specific welding parameters are all selected from a pre-set database based on the specific conditions of the current welding task (such as material type, thickness, welding speed, gas type, etc.) to ensure the best welding effect, reduce the heat affected zone, control the penetration depth, improve production efficiency, and reduce potential defects such as lack of fusion and porosity.

[0102] In the embodiment of the present invention, by matching different arc-starting strategies according to the length of the arc-breaking occurrence time, it avoids the problems of difficult droplet transfer and arc-starting failure caused by too long arc-breaking occurrence time and the cooling of droplets and molten pool, and also avoids the problems of too large droplets and uneven weld formation caused by re-arcing when the arc-breaking occurrence time is very short, thereby effectively improving the welding stability and weld quality.

[0103] In order to execute the corresponding steps in the above embodiments and various possible methods, a method for implementing the welding control device 200 is provided below. Figure 7 , Figure 7 This is a functional module diagram of a welding control device 200 provided in an embodiment of the present invention. It should be noted that the basic principle and technical effects of the welding control device 200 provided in this embodiment are the same as those of the above embodiments. For the sake of brief description, for parts not mentioned in this embodiment, reference can be made to the corresponding contents in the above embodiments. The welding control device 200 includes:

[0104] The monitoring module 201 is used to monitor the welding current during the welding process.

[0105] The determination module 202 is used to determine the first moment according to the real-time change rate of the welding current, and the first moment is the moment when the welding wire of the welding machine starts to contact the workpiece.

[0106] The monitoring module 201 is also used to monitor the welding voltage starting from the first moment.

[0107] The determination module 202 is further used to determine a second moment according to the real-time change rate of the welding voltage, where the second moment is the moment when the molten droplet at the end of the welding wire undergoes necking.

[0108] The judgment module 203 is used to determine the third moment according to the second moment, and to make arcing judgment according to the welding voltage and the real-time change rate of the welding voltage starting from the third moment.

[0109] Optionally, the above modules can be stored in the form of software or firmware. Figure 1 The memory shown in FIG. 1 or the operating system (OS) of the operating device may be fixed therein and may be Figure 1 Meanwhile, the data and program codes required for executing the above modules can be stored in the memory.

[0110] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to multiple embodiments of the present invention. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of a code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0111] In addition, the functional modules in the various embodiments of the present invention may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0112] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0113] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A welding control method, characterized in that: A control device applied to a welding machine, the method comprising: Monitoring welding current during welding, and determining a first moment according to a real-time rate of change of the welding current, wherein the first moment is a moment when a welding wire of the welding machine begins to contact a workpiece; Starting from the first moment, the welding voltage is monitored, and a second moment is determined according to a real-time change rate of the welding voltage, wherein the second moment is a moment when the molten droplet at the end of the welding wire undergoes necking; A third moment is determined according to the second moment, and arcing judgment is performed starting from the third moment according to the welding voltage and the real-time change rate of the welding voltage.

2. The welding control method according to claim 1, characterized in that: The step of determining the second moment according to the real-time change rate of the welding voltage comprises: The moment when the real-time change rate of the welding voltage is first monitored to be not less than the first preset change rate is taken as the second moment.

3. The welding control method according to claim 1, characterized in that: The step of determining the third moment according to the second moment comprises: A moment that is after the second moment and that is a preset time length away from the second moment is taken as the third moment.

4. The welding control method according to claim 1, characterized in that: The step of performing arcing judgment based on the welding voltage and the real-time change rate of the welding voltage starting from the third moment includes: Starting from the third moment, if it is monitored within a preset time range that the welding voltage is not less than a preset voltage and the real-time change rate of the welding voltage is not less than a second preset change rate, arcing is determined.

5. The method according to claim 1, characterized in that After determining the second time according to the real-time change rate of the welding voltage, the method further includes: At the second moment, the welding current is reduced to a preset current range corresponding to the welding wire to prevent the molten droplet at the end of the welding wire from splashing when the welding wire is necked.

6. The method according to claim 1, characterized in that The method further comprises: During the welding process, the welding current is monitored and arc breaking judgment is performed according to the welding current; When determining arc breaking, an arc starting strategy is determined according to the duration of arc breaking, so that the welding machine resumes welding according to the arc starting strategy.

7. The method according to claim 6, characterized in that When determining arc breaking, the step of determining the arc starting strategy according to the arc breaking duration includes: If the arc breaking duration is not greater than the preset arc breaking duration, the arc starting strategy is determined to start the arc according to the welding stage when the arc breaking occurs; If the arc breaking duration is longer than the preset arc breaking duration, the arc starting strategy is determined as direct arc starting.

8. A welding control device, characterized in that: A control device for a welding machine, the device comprising: A monitoring module for monitoring welding current during welding; A determination module, configured to determine a first moment according to a real-time change rate of the welding current, wherein the first moment is a moment when a welding wire of the welding machine begins to contact a workpiece; The monitoring module is also used to monitor the welding voltage starting from the first moment; The determination module is further used to determine a second moment according to the real-time change rate of the welding voltage, wherein the second moment is a moment when the molten droplet at the end of the welding wire undergoes necking; The judgment module is used to determine a third moment according to the second moment, and to make an arcing judgment based on the welding voltage and the real-time change rate of the welding voltage starting from the third moment.

9. A welding machine, characterized in that: The welding machine includes a control device, the control device includes a processor and a memory, the memory stores machine executable instructions that can be executed by the processor, and the processor can execute the machine executable instructions to implement the welding control method described in any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the welding control method according to any one of claims 1 to 7 is implemented.

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