MIG welding control method and welding machine

Abstract

The application discloses a kind of MIG welding control method and welding machine, control method includes: in every droplet transition period, add arc breaking stage, make every droplet transition period include short circuit stage, arc stage and arc breaking stage;Wherein, in every droplet transition period, add arc breaking stage includes: in response to the preset time after arc stage of arc current output, switch to PWM control, in PWM control stage, arc is extinguished, to enter to arc breaking stage;In response to the output of no-load voltage after PWM control ends, and carry out short circuit detection.The application adds arc breaking stage on the basis of short circuit stage and arc stage, and arc breaking stage is realized by PWM control, effectively avoid the occurrence of droplet repulsion transition and droplet drop difficult phenomenon, to reduce welding spatter and improve arc stability, improve welding quality.

Description

Technical Field

[0001] This invention relates to the field of welding technology, specifically to a MIG welding control method and welding machine. Background Technology

[0002] Magnesium alloys are among the lightest engineering structural materials, possessing advantages such as abundant reserves, high specific strength, good electromagnetic shielding, high recyclability, good thermal conductivity, and high magnetic permeability. They have broad application prospects in aerospace, automotive, and electronics industries. The extensive industrial application of magnesium alloys requires reliable joining technologies, as many components need to be joined to similar or dissimilar materials to achieve more complex geometries. To achieve this, welding technology has received particular attention, and its development is a key factor in expanding the application of magnesium alloys in structural component manufacturing.

[0003] With the continuous improvement of welding and servo motor technologies, digital welding machines are increasingly being accepted and used by more and more customers due to their superior welding performance. High-frequency variable-speed wire feeding has also become possible, with cold metal transfer welding technology being a typical example. This process can reduce welding spatter and heat input to some extent when welding magnesium alloys. However, due to the low density of magnesium alloys and the repulsive effect of arc spot pressure, difficulties in droplet repulsion and droplet detachment still exist during the welding process, leading to welding spatter and arc instability. Summary of the Invention

[0004] The purpose of this invention is to provide a MIG welding control method and welding machine to solve the problems of large welding spatter and poor arc stability in the welding process of the prior art.

[0005] To achieve the above objectives, the present invention is implemented using the following technical solution:

[0006] In a first aspect, this application discloses a MIG welding control method, including multiple droplet transfer cycles, each droplet transfer cycle including a short-circuit stage and an arc-ignition stage. The control method includes: adding an arc-breaking stage within each droplet transfer cycle, so that each droplet transfer cycle includes a short-circuit stage, an arc-ignition stage, and an arc-breaking stage; wherein, adding the arc-breaking stage within each droplet transfer cycle includes:

[0007] After a preset time for the arc current output during the arcing phase, the system switches to PWM control. During the PWM control phase, the arc is extinguished to enter the arc-breaking phase.

[0008] It outputs an open-circuit voltage in response to the end of PWM control and performs short-circuit detection.

[0009] Furthermore, after a preset time for the arc current output during the arcing phase, switching to PWM control includes:

[0010] In the first stage of arc current output, constant current control is used, and after the constant current control of the first stage ends, the second stage is output, in which constant current control or electronic reactor control is used; wherein, the current value output by constant current control or electronic reactor control in the second stage is the same as or different from the current value output in the first stage.

[0011] After the second stage output is completed, PWM control is used, where the actual output current value is less than 8A.

[0012] Furthermore, after the second-stage output is completed, PWM control is employed, including:

[0013] After the second stage output is completed, the third stage output is generated, which uses PWM control.

[0014] After the third stage output is completed, the fourth stage output is generated, which uses PWM control; the PWM control in the fourth stage makes the actual output current value less than 8A.

[0015] Furthermore, short-circuit detection is performed during the third stage of output;

[0016] If a short circuit is detected, the current control waveform under the short circuit condition is directly output, and after a delay of 0~2ms, the welding wire is retracted in the negative direction at a speed of 10m / min~60m / min.

[0017] If no short circuit is detected, the fourth stage is output after the third stage ends, and a short circuit detection is performed.

[0018] Furthermore, short-circuit detection is performed during the fourth stage of output;

[0019] If a short circuit is detected, the current control waveform under the short circuit condition is output, and after a delay of 0~2ms, the welding wire is retracted in the negative direction at a speed of 10m / min~60m / min.

[0020] If no short circuit is detected, the no-load voltage will be output after the fourth stage ends, and a short circuit detection will be performed.

[0021] Furthermore, the short circuit determination condition is: the output voltage value is detected to be less than a first preset value for a preset time.

[0022] The specific value of the first preset value can be any value between 5 and 12V, with 8V being the preferred first preset value. The first preset value is the dividing point for judging the transition from the arc breaking stage or the arc extinguishing stage to the short circuit stage. When the first preset value is 8V, if the voltage value drops below 8V, it indicates that the transition from the arc extinguishing stage to the short circuit stage has occurred.

[0023] Furthermore, the output current value during the first stage of control is 50A~600A, and the duration is 0~8.0ms;

[0024] The output current value during the second stage of control is 50A~600A, and the duration is 0~8.0ms.

[0025] Furthermore, the detection and control of the arcing stage includes:

[0026] Collect the output voltage value of the welding machine;

[0027] If the output voltage value is higher than the second preset value for a preset time, it is determined to be in the arcing stage;

[0028] After 0-2ms of detecting the arcing phase, the welding wire is adjusted from the negative retraction state to the stop feeding state or the welding wire is adjusted from the negative retraction state to the positive feeding state, while the arcing current is continuously output.

[0029] The specific value of the second preset value is any value between 5 and 15V, with a preferred second preset value of 10V. The second preset value is the dividing point for judging the transition from the short circuit stage to the arcing stage. When the second preset value is 10V, if the voltage value rises above 10V for a certain period of time, it indicates that the transition from the short circuit stage to the arcing stage has occurred.

[0030] Furthermore, the duration of each droplet transition cycle is 4~20 ms.

[0031] Secondly, this application discloses a welding machine, comprising:

[0032] Memory, used to store instructions;

[0033] A processor for executing the instructions to cause the welding machine to perform operations implementing the MIG welding control method as described in any of the first aspects.

[0034] According to the above technical solution, the beneficial effects of the present invention are as follows:

[0035] This invention adds an arc-breaking stage to the short-circuit stage and the arc-ignition stage. The arc-breaking stage is implemented through PWM control. That is, each droplet transition cycle includes three processes: the arc-ignition stage, the arc-breaking stage, and the short-circuit stage. The existence of the arc-breaking stage can reduce the welding heat input and effectively avoid phenomena such as droplet repulsion during transition and difficulty in droplet detachment, thereby reducing welding spatter, improving arc stability, and improving welding quality. Attached Figure Description

[0036] Figure 1 This is a flowchart of the control method of the present invention;

[0037] Figure 2 This is a schematic diagram of the overall control method of the present invention;

[0038] Figure 3 This is an overall flowchart of the control method of the present invention. Implementation

[0039] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0040] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0041] like Figure 1 As shown, this application discloses a MIG welding control method, including multiple droplet transition cycles. Each droplet transition cycle includes a short-circuit stage and an arc-ignition stage. The control method includes: adding an arc-extinguishing stage within each droplet transition cycle, so that each droplet transition cycle includes a short-circuit stage, an arc-ignition stage, and an arc-extinguishing stage; wherein, adding an arc-extinguishing stage within each droplet transition cycle includes: after a preset time of arc current output in response to the arc-ignition stage, switching to PWM control, extinguishing the arc during the PWM control stage to enter the arc-extinguishing stage; and outputting an open-circuit voltage and performing short-circuit detection in response to the end of PWM control.

[0042] This invention adds an arc-breaking stage to the short-circuit stage and the arc-ignition stage. The arc-breaking stage is implemented through PWM control. That is, each droplet transition cycle includes three processes: the arc-ignition stage, the arc-breaking stage, and the short-circuit stage. The existence of the arc-breaking stage can reduce the welding heat input and effectively avoid phenomena such as droplet repulsion during transition and difficulty in droplet detachment, thereby reducing welding spatter, improving arc stability, and improving welding quality.

[0043] In this application, the arc is extinguished during the PWM control stage. That is, the arc is extinguished by using PWM control to make the actual output current value less than 8A.

[0044] The welding control method described in this application is mainly used to address the problems of large welding spatter and poor arc stability during MIG welding of magnesium alloys and other lightweight materials. The other lightweight materials mentioned can be lightweight alloys or carbon fiber composites. Besides the magnesium alloys mentioned in the background art, lightweight alloys can also be titanium alloys, aluminum alloys, and other lightweight alloys.

[0045] The welding control method of this application can be used not only for lightweight materials, but also for welding metals such as zinc, iron, steel, and copper, as well as their alloys, carbon steel, stainless steel, copper-based alloys, and nickel-based alloys.

[0046] In a further embodiment, such as Figure 2 As shown, each droplet transition cycle includes a short-circuit stage, an arc-ignition stage, and an arc-breaking stage set in sequence. That is, the short-circuit stage, the arc-ignition stage, and the arc-breaking stage have a sequential order within the droplet transition cycle. First comes the short-circuit stage, then the arc-ignition stage, and finally the arc-breaking stage. After the arc-breaking stage ends, the short-circuit stage of the next droplet transition cycle begins.

[0047] In some embodiments, such as Figure 3 As shown, to facilitate the description of the arc-breaking stage, which is a key part of this application, the description begins with the arc-ignition stage, followed by the arc-breaking stage, and finally enters the short-circuit stage. In this application, the short-circuit stage, arc-ignition stage, and arc-breaking stage of each droplet transition cycle are performed sequentially, as follows: Figure 2 As shown, the sequence cannot be: short circuit stage first, then arc breaking stage, and finally arc ignition stage; nor can it be: arc ignition stage first, then short circuit stage, and finally arc breaking stage; nor can it be: arc breaking stage first, then arc ignition stage, and finally short circuit stage.

[0048] In this application, during the short-circuit phase, the welding wire is drawn in the negative direction at a speed of 10 m / min to 60 m / min; during the arc-ignition phase, the welding wire is stopped; and during the arc-extinguishing phase, the welding wire is fed in the positive direction at a speed of 10 m / min to 60 m / min. This application adjusts the welding wire from a negative drawing state to a stopped feeding state from the short-circuit phase to the arc-ignition phase, and then back to a positive feeding state from the stopped feeding state to the arc-extinguishing phase.

[0049] In one embodiment, the wire feeding is not stopped during the arcing phase, and this non-stopping of wire feeding is independent of the duration of the arcing phase. Figure 2 As shown, the negative wire drawing action continues within 0~2ms during the arc ignition stage, and then directly switches to the positive wire feeding state. In this case, the wire feeding stop action is not executed during the arc ignition stage. Example

[0050] In one specific embodiment, the welding control method of this application includes the following steps:

[0051] Step 1: Collect the output current and output voltage values ​​of the welding machine, and determine the short circuit, arcing and arc breaking states. The output current value is the actual output current value of the welding machine during the welding process, and the output voltage value is the actual output voltage value of the welding machine during the welding process.

[0052] Step 2: During arc detection, if the output voltage value is higher than 10V and the duration is greater than 0~100us, it is judged to be in an arc state. When the arc state is detected, after a delay of 0~2ms, the welding wire is adjusted from the negative retraction state to the stop wire feeding state, and the arc current is output to start the first stage of constant current control. The duration of the stop wire feeding is 0~10ms. The output current value during constant current control is 50A~600A and the duration is 0~8.0ms.

[0053] Step 3: After the constant current control output of the first stage ends, the output of the second stage begins. The second stage adopts constant current control or electronic reactor control. At this time, the arc current value is 50A~600A and the duration is 0~8.0ms.

[0054] Step 4: After the second stage output is completed, the third stage output begins, and short circuit detection begins. If the output voltage value is less than 8V and the duration is greater than 0~100us, it is judged as a short circuit detection. The third stage uses PWM control, and the magnitude of the PWM value in the third stage will affect the current output waveform of the third stage.

[0055] Step 5: If a short circuit is detected in the third stage, proceed directly to the command in step 7 until welding is complete. If no short circuit is detected in the third stage, the fourth stage will begin outputting after the third stage output ends. The fourth stage still executes PWM control and performs short circuit detection. The PWM value in stage T4 will cause the actual output current value to be less than 8A, extinguishing the arc and entering the arc-breaking stage. The magnitude of the PWM value in the fourth stage will affect the magnitude of the arc-breaking voltage after arc breaking.

[0056] If a short circuit is detected in step 6, proceed directly to the command in step 7 until welding is complete. If no short circuit is detected in stage 4, after the output of stage 4 ends, re-output the open-circuit voltage and continue short circuit detection.

[0057] Step 7: When a short circuit is detected, immediately output the current control waveform under the short circuit state, and after a delay of 0~2ms, retract the welding wire in the negative direction at a speed of 10m / min~60m / min. At the same time, start the arc detection.

[0058] Step 8: Once an arc is detected, repeat the commands from Steps 2 to 7 above, and continue this cycle until welding is complete.

[0059] The above steps 2-8 are described in the order of arcing stage, arc breaking stage and short circuit stage. In other embodiments, they can also be implemented in the order of short circuit stage, arcing stage to arc breaking stage.

[0060] In step 3, depending on the welding material, welding gas, or welding wire diameter, after the constant current output of the first stage ends, the second stage can adopt constant current control or electronic reactor control. When the second stage adopts constant current control or electronic reactor control, the output current value is the same as, larger than, or smaller than the output current value of the constant current control in the first stage.

[0061] In step 7, once the short circuit state is entered, different current control waveforms can be output depending on the welding material, welding gas, or welding wire diameter.

[0062] In step 5, if a short circuit is detected before arc interruption occurs in the third or fourth stage, there is no arc interruption stage in the droplet transfer. This is an isolated anomaly and will not effectively reduce welding heat input, nor is it the goal of this patent. In step 5, when no short circuit is detected in the third and fourth stages, each droplet transfer cycle will go through three processes: the arc ignition stage, the arc interruption stage, and the short circuit stage. The cycle time for each droplet transfer is 4~20ms. This is the goal of this patent.

[0063] A smaller PWM value results in a faster current drop, making arc extinguishing easier, but also a lower open-circuit voltage after arc extinguishing. This application employs segmented PWM control in the third and fourth stages. The third stage PWM control allows for arbitrary changes to the current waveform and arc extinguishing time, while the fourth stage PWM control allows for arbitrary changes to the open-circuit voltage after arc extinguishing, enabling diverse waveform design. Of course, the PWM control parameters for the third and fourth stages can also remain consistent.

[0064] Specifically, such as Figures 2-3As shown, when arcing is detected, the present invention continues constant current control during the T1 time phase after arcing, and continues wire retraction within 0-2ms after arcing detection. Then, the wire is adjusted from negative retraction to a stopped wire feeding state, where the stopped wire feeding time is T5, ranging from 0-10ms. After T5 output, forward wire feeding begins, with a forward wire feeding speed ranging from 10m / min to 60m / min. After the constant current output in the T1 phase ends, constant current control or electronic reactor control continues in the T2 phase. The current value output under constant current control or electronic reactor control in the T2 phase may be the same as, larger than, or smaller than the current value output under constant current control in the T1 phase. After the T2 stage output ends, the T3 stage begins, and short-circuit detection is performed in real time. The T3 stage uses PWM control, and the magnitude of the PWM value affects the current output waveform. Normally, no short circuit is detected in the T3 stage. After the T3 stage output ends, the T4 stage begins. The T4 stage also performs PWM control and short-circuit detection, and the PWM value in the T4 stage causes the arc to extinguish, thus entering the arc-breaking stage. The magnitude of the PWM value in the T4 stage affects the arc-breaking voltage value after arc breaking. Generally, no short circuit is detected in the T4 stage. After the T4 stage output ends, the open-circuit voltage is output again, and short-circuit detection and re-ignition of the arc begin. When a short circuit and successful arc ignition signal are detected, the current control waveform under short-circuit conditions is output. After a delay of 0-2ms, the welding wire is retracted in the negative direction at a speed of 10m / min-60m / min. Simultaneously, arc detection begins. When arc ignition is detected, the above steps are repeated.

[0065] In some other embodiments, a short circuit is detected in stage T4. At this time, the subsequent no-load voltage stage is no longer output. Instead, the current control waveform under the short circuit state is directly output. After a delay of 0 to 2 ms, the welding wire is retracted in the negative direction at a speed of 10 m / min to 60 m / min. At the same time, arc detection is started. When arc is detected, the above control process is repeated.

[0066] In some specific embodiments, a short circuit is detected in stage T3. The probability of this occurring is extremely low, and this application only describes this situation and does not limit the control method of this application. When a short circuit is detected in stage T3, stage T4 is no longer output; instead, the current control waveform under short-circuit conditions is directly output. After a delay of 0-2ms, the welding wire is retracted in the negative direction at a speed of 10m / min-60m / min. Simultaneously, arc detection begins. When arc is detected, the above control process is repeated to ensure the normal operation of subsequent welding.

[0067] This invention adds an arc-breaking stage to the short-circuit and arc-ignition stages, and the arc-breaking stage is implemented through PWM control. That is, each droplet transition cycle includes three processes: the arc-ignition stage, the arc-breaking stage, and the short-circuit stage. The cycle time of each droplet transition is 4~20ms. The existence of the arc-breaking stage can reduce the welding heat input and effectively avoid phenomena such as droplet repulsion during transition and difficulty in droplet detachment, thereby reducing welding spatter, improving arc stability, and improving welding quality.

[0068] This invention effectively controls the current output and wire feed output during the arc-burning stage, and then achieves arc-interrupting welding under PWM control. This reduces welding heat input and avoids the repulsive droplet transfer phenomenon caused by the presence of the arc, thereby reducing welding spatter and improving arc stability. This technology can further reduce welding heat input and spatter on the basis of cold metal transfer technology. It is very suitable for welding lightweight materials such as magnesium alloys and other materials that are sensitive to heat input. It is also suitable for welding carbon steel, stainless steel, aluminum alloys, copper-based alloys and nickel-based alloys. Example

[0069] In one embodiment of this application, a welding machine is also disclosed, comprising: a memory for storing instructions; and a processor for executing the instructions, causing the welding machine to perform the operation of the welding control method of any of the above embodiments.

[0070] The components of the welding machine may include, but are not limited to: at least one processor, at least one memory, and a bus connecting different system components (including the memory and the processor). The processor may be connected to the welding unit of the welding machine, which generates heat in response to the welding current output by the processor to achieve welding of the workpiece.

[0071] The memory stores program code that can be executed by a processor, causing the processor to perform the steps described in the "Exemplary Methods" section above, based on various exemplary embodiments of the present invention. For example, the processor can perform actions such as... Figure 2 or Figure 3 The steps are shown in the figure.

[0072] The memory may include readable media in the form of volatile memory, such as random access memory (RAM) and / or cache memory, and may further include read-only memory (ROM).

[0073] The memory may also include programs / utilities having a set (at least one) of program modules, including but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of these examples may include an implementation of a network environment.

[0074] A bus can represent one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, a graphics acceleration port, a processing unit, or a local bus that uses any of the various bus structures.

[0075] The welding machine can also communicate with one or more external devices (such as keyboards, pointing devices, Bluetooth devices, etc.), one or more devices that enable user interaction with the welding machine, and / or any device that enables the welding machine to communicate with one or more other computing devices (such as routers, modems, etc.). This communication can be achieved through input / output (I / O) interfaces. Furthermore, the welding machine can communicate with one or more networks (such as local area networks (LANs), wide area networks (WANs), and / or public networks, such as the Internet) via a network adapter. The network adapter communicates with other modules of the welding machine via a bus.

[0076] It should be understood that, although not shown in the figure, other hardware and / or software modules can be used in conjunction with the welding machine, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0077] From the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solutions according to the embodiments of this disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, external hard drive, etc.) or on a network, including several instructions to cause a computing device (such as a personal computer, server, terminal device, or network device, etc.) to execute the methods according to the embodiments of this disclosure.

[0078] In exemplary embodiments of this disclosure, a computer-readable storage medium is also provided, on which a program product capable of implementing the methods described above is stored. In some possible embodiments, various aspects of the invention may also be implemented as a program product comprising program code that, when the program product is run on a terminal device, causes the terminal device to perform the steps of the various exemplary embodiments of the invention described in the "Exemplary Methods" section of this specification.

[0079] The program product for implementing the above-described method according to embodiments of the present invention may employ a portable compact disc read-only memory (CD-ROM) and include program code, and may run on a terminal device, such as a personal computer. However, the program product of the present invention is not limited thereto. In this document, the readable storage medium may be any tangible medium containing or storing a program that may be used by or in conjunction with an instruction execution system, apparatus, or device.

[0080] The program product may employ any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0081] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A readable signal medium may also be any readable medium other than a readable storage medium, capable of outputting, propagating, or transmitting programs for use by or in conjunction with an instruction execution system, apparatus, or device.

[0082] The program code contained on the readable medium may be transmitted using any suitable medium, including but not limited to wireless, wired, optical fiber, RF, etc., or any suitable combination thereof.

[0083] Program code for performing the operations of this invention can be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java and C++, and conventional procedural programming languages ​​such as C or similar languages. The program code can execute entirely on the user's computing device, partially on the user's device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server. In cases involving remote computing devices, the remote computing device can be connected to the user's computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0084] As is known from common technical knowledge, this invention can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this invention or its equivalents are included in this invention.

Claims

1. A MIG welding control method, comprising multiple droplet transfer cycles, each droplet transfer cycle including a short-circuit stage and an arc-ignition stage, characterized in that, The control method includes: adding an arc-breaking stage within each droplet transition cycle, so that each droplet transition cycle includes a short-circuit stage, an arc-ignition stage, and an arc-breaking stage; wherein, adding the arc-breaking stage within each droplet transition cycle includes: After a preset time for the arc current output during the arcing phase, the system switches to PWM control. During the PWM control phase, the arc is extinguished, thus entering the arc-extinguishing phase. The switching to PWM control after the preset time for the arc current output during the arcing phase includes: In the first stage of arc current output, constant current control is used, and after the constant current control of the first stage ends, the second stage is output, in which constant current control or electronic reactor control is used; wherein, the current value output by constant current control or electronic reactor control in the second stage is the same as or different from the current value output in the first stage. After the second stage output is completed, the third stage output is generated, which uses PWM control. After the third stage output is completed, the fourth stage output is generated, which uses PWM control; the PWM control in the fourth stage ensures that the actual output current value is less than 8A. In response to the end of PWM control, an open-circuit voltage is output and a short-circuit detection is performed. Specifically, during the third stage of output, a short-circuit detection is performed. If a short circuit is detected, the current control waveform under short-circuit conditions is output, and after a delay of 0 to 2 ms, the welding wire is retracted in the negative direction at a speed of 10 m / min to 60 m / min. If no short circuit is detected, an open-circuit voltage is output and a short-circuit detection is performed after the end of the fourth stage. Short circuit detection is performed during the fourth stage of output. If a short circuit is detected, the current control waveform under the short circuit state is output, and after a delay of 0~2ms, the welding wire is retracted in the negative direction at a speed of 10m / min~60m / min. If no short circuit is detected, the no-load voltage will be output after the fourth stage ends, and a short circuit detection will be performed.

2. The MIG welding control method according to claim 1, characterized in that, The short circuit determination condition is: the output voltage value is detected to be less than the first preset value for a preset time.

3. The MIG welding control method according to claim 1, characterized in that, The output current value during the first stage of control is 50 A ~ 600 A, and the duration is 0 ~ 8.0 ms; During the second stage of control, the output current value is 50 A ~ 600 A, and the duration is 0 ~ 8.0 ms.

4. The MIG welding control method according to claim 1, characterized in that, The detection and control of the arcing stage includes: Collect the output voltage value of the welding machine; If the output voltage value is higher than the second preset value for a preset time, it is determined to be in the arcing stage; After 0-2ms of detecting the arcing phase, the welding wire is adjusted from the negative retraction state to the stop feeding state or the welding wire is adjusted from the negative retraction state to the positive feeding state, while the arcing current is continuously output.

5. The MIG welding control method according to any one of claims 1-4, characterized in that, The duration of each droplet transition cycle is 4~20 ms.

6. A welding machine, characterized in that, include: Memory, used to store instructions; A processor for executing the instructions, causing the welding machine to perform operations that implement the MIG welding control method as described in any one of claims 1-4.

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