Dead zone detection welding control method and welding machine system, device, storage medium

Abstract

The application discloses a dead zone detection welding control method, a welding machine system, a device and a storage medium, and is applied to the welding machine system. The welding machine system comprises a power supply driving module and a control module. A plurality of switching tubes are arranged in the power supply driving module. The control module is connected with the controlled ends of the switching tubes to output PWM control signals to control the power supply driving module to output welding power. The dead zone detection welding control method comprises the following steps: acquiring a dead zone welding voltage of the welding power in a dead zone time of the power supply driving module; and when the dead zone welding voltage meets a turn-off condition, turning off the switching tubes to reduce the welding current of the welding power. According to the design, the particle splashing caused by the large current is reduced, the stability of droplet transfer in the welding process is improved, and the forming quality of the welding seam is optimized.

Description

Technical Field

[0001] This invention relates to the field of arc welding power supply control technology, and in particular to a dead zone detection welding control method, welding machine system, device, and storage medium. Background Technology

[0002] Gas metal arc welding (GMAW), such as CO2 welding or MAG welding, is widely used in metal welding. During the welding process, a short-circuit transition occurs, accompanied by periodic wire short circuits, droplet necking, and arc reignition. The following technical problems exist: 1. Severe interference in feedback sampling: The control module continuously acquires the working welding voltage and current of the welding power source. However, due to the frequent switching of IGBTs and other switching transistors, the sampling signals for the working welding voltage and current are mixed with severe electromagnetic interference and switching noise, affecting control accuracy and even causing misjudgments. 2. Lack of a reasonable short-circuit current suppression strategy: Maintaining a constant welding power output when the wire is short-circuited leads to a sharp increase in current in the initial stage of the short circuit, resulting in large-particle spatter and affecting welding stability. 3. During the necking stage when the droplet is about to detach from the wire, a significant electro-explosion effect occurs when the arc reignites, affecting the stability of the droplet transition and the quality of the weld formation. Currently, there is no good control strategy to address these shortcomings. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a dead zone detection welding control method, welding machine system, device, and storage medium to improve the stability of droplet transfer during welding and optimize the weld formation quality.

[0004] According to a first aspect of the present invention, a dead-zone detection welding control method is applied to a welding machine system. The welding machine system includes a power drive module and a control module. The power drive module is provided with a plurality of switching transistors. The control module is connected to the controlled terminal of each of the switching transistors to output a PWM control signal to control the power drive module to output welding power. The dead-zone detection welding control method includes: acquiring the dead-zone welding voltage of the welding power during the dead time of the power drive module; and controlling each switching transistor to turn off when the dead-zone welding voltage meets the turn-off condition to reduce the welding current of the welding power.

[0005] The dead-zone detection welding control method according to embodiments of the present invention has at least the following beneficial effects:

[0006] This invention discloses a dead-zone detection welding control method. The control module outputs a PWM control signal to control the operation of each switching transistor within the power drive module. Under the control of the PWM signal, when some switching transistors are turned on, others are turned off, and vice versa. This switching occurs sequentially. To prevent all switching transistors from being on at any given moment, a dead-zone process is incorporated during the switching. During the dead-zone process, the on-state switching transistors first switch off, and then the off-state switching transistors switch back on. The dead-zone welding voltage of the welding power supply is obtained during the dead-zone time, effectively avoiding noise interference during the switching process and improving the accuracy of the judgment. When the dead-zone welding voltage meets the turn-off condition, each switching transistor is promptly turned off, thereby ensuring a reduction in the output welding current, reducing particle spatter caused by high current, improving the stability of droplet transfer during welding, and optimizing the weld formation quality.

[0007] According to some embodiments of the present invention, the turn-off condition includes whether the dead zone welding voltage is lower than the short-circuit voltage threshold; the step of controlling each switch to turn off to reduce the welding current of the welding power supply when the dead zone welding voltage meets the turn-off condition includes: when the dead zone welding voltage is lower than the short-circuit voltage threshold, the dead zone welding voltage meets the turn-off condition; when the dead zone welding voltage is higher than the short-circuit voltage threshold, the dead zone welding voltage does not meet the turn-off condition.

[0008] According to some embodiments of the present invention, when the dead zone welding voltage is lower than the short-circuit voltage threshold, controlling the turn-off of each switch includes: controlling each switch to remain off with a first time value.

[0009] According to some embodiments of the present invention, when the dead zone welding voltage is lower than the short-circuit voltage threshold, controlling each switch to turn off includes: when the working welding voltage recovers to a level higher than the short-circuit voltage threshold, controlling the corresponding switch to turn on again.

[0010] According to some embodiments of the present invention, the turn-off condition includes whether the rate of change of the dead zone welding voltage is greater than the necking threshold; the step of controlling each switch to turn off to reduce the welding current of the welding power supply when the dead zone welding voltage meets the turn-off condition includes: when the rate of change of the dead zone welding voltage is greater than the necking threshold, the dead zone welding voltage meets the turn-off condition; when the rate of change of the dead zone welding voltage is less than the necking threshold, the dead zone welding voltage does not meet the turn-off condition.

[0011] According to some embodiments of the present invention, when the rate of change of the dead zone welding voltage is greater than the necking change threshold, controlling the turn-off of each switch includes: controlling each switch to remain off with a second time value.

[0012] According to some embodiments of the present invention, the dead zone detection welding control method further includes: acquiring the working welding voltage and working welding current of the welding power source; feeding back and modulating a PWM control signal based on the working welding voltage and working welding current; and controlling each switch to turn off to reduce the welding current of the welding power source when the dead zone welding voltage meets the turn-off condition, which includes: controlling each switch to turn off by modulating the PWM control signal.

[0013] According to a second aspect of the present invention, a welding machine system includes a power drive module and a control module. The power drive module is provided with a plurality of switching transistors. The control module is connected to the controlled terminal of each of the switching transistors to output a PWM control signal to control the power drive module to output welding power. The control module executes a dead zone detection welding control method disclosed in any of the above embodiments.

[0014] The welding machine system according to embodiments of the present invention has at least the following beneficial effects:

[0015] The welding machine system of the present invention applies the dead zone detection welding control method disclosed in any of the above embodiments, which reduces particle spatter caused by high current, improves the stability of droplet transfer during welding, and optimizes the weld formation quality.

[0016] According to a third aspect of the present invention, the control device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the dead zone detection welding control method disclosed in any of the above embodiments.

[0017] According to a fourth aspect of the present invention, a computer-readable storage medium stores a computer program that, when executed by a processor, implements the dead-zone detection welding control method disclosed in any of the above embodiments.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is a schematic diagram of the welding machine system of the present invention, representing one embodiment.

[0021] Figure 2 This is a circuit diagram of the power drive module of one embodiment of the welding machine system of the present invention;

[0022] Figure 3This is a circuit diagram of the current acquisition module and voltage acquisition module of one embodiment of the welding machine system of the present invention;

[0023] Figure 4 This is a circuit diagram of the feedback modulation module of one embodiment of the welding machine system of the present invention;

[0024] Figure 5 This is a flowchart of one embodiment of the dead zone detection welding control method of the present invention;

[0025] Figure 6 This is a waveform diagram of one embodiment of the welding machine system of the present invention;

[0026] Figure 7 This is a schematic diagram of the control device of the present invention in one embodiment.

[0027] Figure label:

[0028] Power drive module 100; first rectifier module 110; inverter drive module 120; transformer module 130; second rectifier unit 140; control module 200; PWM modulator 210; feedback modulation module 220; voltage PI regulation unit 221; reactance regulation unit 222; current PI regulation unit 223; current setpoint unit 230; current sampling module 300; voltage sampling module 400; processor 610; memory 620; input / output interface 630; communication interface 640; bus 650. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0030] It should be noted that although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0032] like Figures 1 to 6As shown, the dead zone detection welding control method according to the first aspect of the present invention is applied to a welding machine system. The welding machine system includes a power drive module 100 and a control module 200. The power drive module 100 is provided with a plurality of switching transistors. The control module 200 is connected to the controlled terminal of each of the switching transistors to output a PWM control signal to control the power drive module 100 to output welding power.

[0033] Among them, such as Figure 2 As shown, the power drive module 100 typically includes a first rectifier module 110, an inverter drive module 120, a transformer module 130, and a second rectifier unit 140. The first rectifier module 110 can be a full-wave rectifier bridge composed of multiple rectifier diodes. The input terminal of the first rectifier module 110 can be used to connect to a three-phase AC power supply. The inverter drive module 120 can be a power conversion circuit composed of multiple semiconductor switching transistors forming an H-bridge. The switching transistors can be transistors, MOSFETs, IGBTs, etc. The output terminal of the first rectifier module 110 is connected to the DC input terminal of the inverter drive module 120. The primary winding of the transformer module 130 is connected to the AC output terminal of the inverter drive module 120. The secondary winding of the transformer module 130 is connected to the input terminal of the second rectifier module. The output terminal of the second rectifier module outputs welding power. The second rectifier module can also be a full-wave rectifier bridge or a half-wave rectifier bridge composed of multiple rectifier diodes.

[0034] The control module 200 includes an MCU or CPU processor 610 and its auxiliary circuitry. The control module 200 connects to the controlled terminals of each switching transistor to control the on / off state of each transistor. Typically, during the operation of the inverter drive module 120, such as... Figure 2 As shown, in the first time period, switches Q1 and Q4 are turned on, while switches Q2 and Q3 are turned off. In the second time period, switches Q1 and Q4 are turned off, while switches Q2 and Q3 are turned on. The control module 200 controls each switch to switch between the states in the first and second time periods. During the switching process, there may be a situation where switches Q1, Q2, Q3, and Q4 are all turned on. To prevent all switches from being turned on at a certain moment, a dead time is introduced between the states in the first and second time periods. Under the control of the PWM control signal, during the dead time, the turned-on switches first switch to turn off, and then the turned-off switches switch back to turn on.

[0035] The dead zone detection welding control method includes:

[0036] S510: Obtain the dead-time welding voltage of the welding power supply during the dead-time of the power drive module 100.

[0037] S520: When the dead zone welding voltage meets the turn-off condition, control each switching transistor to turn off in order to reduce the welding current of the welding power supply.

[0038] The control module 200 outputs a corresponding PWM control signal to each switching transistor. When it is necessary to control the switching transistor to turn off, the control module 200 can modulate the PWM control signal and then output the PWM control signal to control the switching transistor to turn off.

[0039] The dead-zone detection welding control method of the present invention uses a control module 200 to output a PWM control signal to control the operation of each switching transistor in the power drive module 100. During the dead time, the dead-zone welding voltage of the welding power supply is obtained, effectively avoiding noise interference during the switching process of the switching transistors, improving the accuracy of judgment. When the dead-zone welding voltage meets the turn-off condition, each switching transistor is turned off in time, thereby ensuring a reduction in the output welding current, reducing particle spatter caused by high current, improving the stability of droplet transfer during welding, and optimizing the weld formation quality.

[0040] In some embodiments of the present invention, such as Figure 6 As shown, the shutdown condition includes whether the dead zone welding voltage is lower than the short-circuit voltage threshold. It should be noted that the output terminal of the power drive module 100 continuously outputs welding power. The welding power output in real time includes the working welding voltage and the working welding current. The dead zone welding voltage is a part of the working welding voltage detected in the dead time. Similarly, the dead zone welding current is a part of the working welding current detected in the dead time.

[0041] The method of controlling the turn-off of each switch to reduce the welding current of the welding power supply when the dead zone welding voltage meets the turn-off condition includes:

[0042] When the dead zone welding voltage is lower than the short-circuit voltage threshold, the dead zone welding voltage meets the turn-off condition.

[0043] If the dead zone welding voltage is higher than the short-circuit voltage threshold, the dead zone welding voltage does not meet the turn-off condition.

[0044] It is understandable that when the molten welding wire drips onto the workpiece, for a certain period of time, the welding wire, the molten droplet, and the workpiece connect to form a circuit with low resistance. The working welding voltage will decrease, while the current will increase. If the current is too high, it will cause sparks to fly. Therefore, when the dead zone welding voltage is detected to be lower than the short-circuit voltage threshold (the short-circuit voltage threshold can be set to 13-15V, which is not specifically limited here), the switching transistors can be turned off to reduce the welding current of the welding power supply.

[0045] In some embodiments of the present invention, when the dead zone welding voltage is lower than the short-circuit voltage threshold, controlling the turn-off of each switch includes:

[0046] The first time value is used to control each switch to remain off.

[0047] There are several ways to control the turn-off of each switching transistor when the dead zone welding voltage is lower than the short-circuit voltage threshold. For example, the operator can set a first time value according to actual needs. The first time value can be 0.2-1ms. After the first time value has elapsed, the corresponding switching transistor will be turned on according to the original PWM control signal.

[0048] Alternatively, in some embodiments of the present invention, when the dead zone welding voltage is lower than the short-circuit voltage threshold, controlling the turn-off of each switch includes:

[0049] When the working welding voltage recovers to a level higher than the short-circuit voltage threshold, the corresponding switch is controlled to resume conduction.

[0050] When the dead zone welding voltage is lower than the short-circuit voltage threshold, after controlling each switch to turn off, the working welding voltage is continuously acquired. When the working welding voltage recovers to a level higher than the short-circuit voltage threshold, the corresponding switch is controlled to turn on according to the original PWM control signal.

[0051] During the molten droplet's descent, the droplet may experience necking (the droplet width narrows and eventually breaks off from the welding wire) and arc re-ignition may occur between the welding wire and the workpiece. At this time, the working welding voltage will increase dramatically. This characteristic can be accurately detected through the dead zone welding voltage. To reduce the electro-explosive energy during arc regeneration and achieve a flexible droplet transition, in some embodiments of the present invention, such as... Figure 6 As shown, the shutdown condition includes whether the rate of change of the dead zone welding voltage is greater than the necking change threshold.

[0052] The method of controlling the turn-off of each switch to reduce the welding current of the welding power supply when the dead zone welding voltage meets the turn-off condition includes:

[0053] When the rate of increase of the dead zone welding voltage is greater than the necking threshold, the dead zone welding voltage meets the turn-off condition.

[0054] If the rate of increase of the dead zone welding voltage is less than the necking threshold, the dead zone welding voltage does not meet the turn-off condition.

[0055] The rate of voltage increase is obtained by differentiating the change in dead zone welding voltage. When the rate of voltage increase in dead zone welding voltage is greater than the necking threshold, the turn-off control of each switching transistor is controlled in a timely manner.

[0056] In some embodiments of the present invention, when the rate of change of the dead zone welding voltage is greater than the necking change threshold, controlling the turn-off of each switch includes:

[0057] The second time value is used to control each switch to remain off.

[0058] Similarly, when the rate of change of the dead zone welding voltage is greater than the necking change threshold, there are multiple ways to control the turn-off of each switching transistor. For example, the operator can set a second time value according to actual needs. The second time value can be 0.2-1ms. After the second time value has elapsed, the corresponding switching transistor is turned on according to the original PWM control signal.

[0059] Alternatively, the working welding voltage can be continuously acquired to calculate the boost rate of change. Once the boost rate of change is less than the necking threshold, the corresponding switching transistor can be turned on according to the original PWM control signal.

[0060] In some embodiments of the present invention, the dead zone detection welding control method further includes:

[0061] Obtain the working welding voltage and working welding current of the welding power source;

[0062] The PWM control signal is modulated based on the working welding voltage and working welding current feedback.

[0063] The method of controlling the turn-off of each switch to reduce the welding current of the welding power supply when the dead zone welding voltage meets the turn-off condition includes:

[0064] The individual switching transistors are turned off by modulating the PWM control signal.

[0065] This design continuously acquires the working welding voltage and working welding current of the welding power source. The control module 200 modulates a PWM control signal based on the feedback working welding voltage and working welding current. Then, in the process of acquiring the dead zone welding voltage and judging the turn-off condition, the PWM control signal is superimposed and modulated. For example, if an N-type switching transistor is used, the PWM control signal level can be pulled low, thereby driving the switching transistor to turn off.

[0066] According to a second aspect of the present invention, a welding machine system includes a power drive module 100 and a control module 200. The power drive module 100 is provided with a plurality of switching transistors. The control module 200 is connected to the controlled terminal of each of the switching transistors to output a PWM control signal to control the power drive module 100 to output welding power. The control module 200 executes a dead zone detection welding control method disclosed in any of the above embodiments.

[0067] The control module 200 may include a current sampling module 300, a voltage sampling module 400, a processor 610, a PWM modulator 210, and a feedback modulation module 220. The processor 610 may be an MCU or a CPU and its auxiliary circuits, and the PWM modulator 210 may be a conventional PWM modulation chip and its auxiliary circuits.

[0068] like Figure 3 , 4 As shown, the feedback modulation module 220 includes a voltage PI adjustment unit 221, a reactance adjustment unit 222, and a current PI adjustment unit 223. The current sampling module 300 is connected to the output of the second rectifier module to detect the working welding current and can acquire the dead-zone welding current during the dead time. The voltage sampling module 400 is connected to the output of the second rectifier module to detect the working welding voltage and can acquire the dead-zone welding voltage during the dead time. The output of the voltage sampling module 400 is connected to the first input of the voltage PI adjustment unit 221 and the processor 610. The processor 610 is connected to the second input of the voltage PI adjustment unit 221 to output a voltage command signal. The output of the voltage PI adjustment unit 221 is connected to the reactance... The input terminal of the regulating unit 222 is connected, the output terminal of the reactance regulating unit 222 is connected to the first input terminal of the current PI regulating unit 223, the processor 610 outputs a current command signal to the second input terminal of the current PI regulating unit 223 according to the dead zone welding voltage and the turn-off condition, the output terminal of the current sampling module 300 is connected to the third input terminal of the current PI regulating unit 223, and the output terminal of the current PI regulating unit 223 is connected to the PWM modulator 210 to control the PWM modulator 210 to form a PWM control signal modulated by the processor 610 and provide it to each switching transistor. The processor 610 outputs a current command signal to the second input terminal of the current PI regulating unit 223 through the current command unit 230.

[0069] Specifically, such as Figure 6 As shown, Iw is the dead zone welding current (working welding current), Vw is the dead zone welding voltage (working welding voltage), Sd is the control signal set by the processor 610 when the dead zone welding voltage is lower than the short-circuit voltage threshold Vts, and the processor controls each switch to remain off with the first time value Tse; Nd is the control signal set by the processor 610 when the rate of change of the dead zone welding voltage is greater than the necking change threshold Vtn, and the processor controls each switch to remain off with the second time value Tn; and Ib is the current command signal output by the processor 610.

[0070] The welding machine system of the present invention applies the dead zone detection welding control method disclosed in any of the above embodiments, which reduces particle spatter caused by high current, improves the stability of droplet transfer during welding, and optimizes the weld formation quality.

[0071] According to a third aspect of the present invention, the control device includes a memory 620 and a processor 610. The memory 620 stores a computer program, and the processor 610 executes the computer program to implement the dead zone detection welding control method disclosed in any of the above embodiments.

[0072] like Figure 7 As shown, Figure 7 The hardware structure of a control device according to another embodiment is also illustrated. The control device includes:

[0073] The processor 610 can be implemented using a general-purpose central processing unit (CPU), a microprocessor 610, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this application.

[0074] The memory 620 can be implemented as a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 620 can store the operating system and other applications. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program code is stored in the memory 620 and is called and executed by the processor 610 to execute the dead-zone detection welding control method of the embodiments of this application.

[0075] The input / output interface 630 is used to realize information input and output;

[0076] The communication interface 640 is used to enable communication and interaction between this device and other devices. Communication can be achieved through wired means (such as USB, network cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.).

[0077] Bus 650 transmits information between various components of the device (e.g., processor 610, memory 620, input / output interface 630, and communication interface 640);

[0078] The processor 610, memory 620, input / output interface 630 and communication interface 640 are connected to each other within the device via bus 650.

[0079] According to a fourth aspect of the present invention, a computer-readable storage medium stores a computer program that, when executed by a processor 610, implements the dead zone detection welding control method disclosed in any of the above embodiments.

[0080] Memory 620, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, the memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory 620 may optionally include memory remotely located relative to the processor, which can be connected to the processor via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0081] The embodiments described in this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. As those skilled in the art will know, with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

[0082] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of this application, and may include more or fewer steps than shown, or combine certain steps, or different steps.

[0083] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0084] Those skilled in the art will understand that all or some of the steps in the methods disclosed above, as well as the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, or suitable combinations thereof.

[0085] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0086] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.

Claims

1. A dead-zone detection welding control method, applied to a welding machine system, the welding machine system including a power drive module and a control module, wherein the power drive module is provided with multiple switching transistors, and the control module is connected to the controlled terminal of each of the switching transistors to output PWM control signals to control the power drive module to output welding power, characterized in that, The dead zone detection welding control method includes: The dead-time welding voltage of the welding power supply is obtained during the dead time of the power drive module. During the dead time, the originally conducting switching transistor in the power drive module is first switched to the off state, and then the originally off switching transistor is switched to the on state. When the dead zone welding voltage meets the turn-off condition, control each switching transistor to turn off in order to reduce the welding current of the welding power supply. The shutdown condition includes whether the dead zone welding voltage is lower than the short-circuit voltage threshold. The method of controlling the turn-off of each switch to reduce the welding current of the welding power supply when the dead zone welding voltage meets the turn-off condition includes: When the dead zone welding voltage is lower than the short-circuit voltage threshold, the dead zone welding voltage meets the turn-off condition. When the dead zone welding voltage is higher than the short-circuit voltage threshold, the dead zone welding voltage does not meet the turn-off condition. Alternatively, the shutdown condition may include whether the rate of increase of the dead zone welding voltage is greater than the necking change threshold. The method of controlling the turn-off of each switch to reduce the welding current of the welding power supply when the dead zone welding voltage meets the turn-off condition includes: When the rate of increase of the dead zone welding voltage is greater than the necking threshold, the dead zone welding voltage meets the turn-off condition. If the rate of increase of the dead zone welding voltage is less than the necking threshold, the dead zone welding voltage does not meet the turn-off condition.

2. The dead zone detection welding control method according to claim 1, characterized in that, When the dead zone welding voltage is lower than the short-circuit voltage threshold, the control of turning off each switch includes: The first time value is used to control each switch to remain off.

3. The dead zone detection welding control method according to claim 1, characterized in that, When the dead zone welding voltage is lower than the short-circuit voltage threshold, the control of each switching transistor to turn off includes: When the working welding voltage recovers to a level higher than the short-circuit voltage threshold, the corresponding switch is controlled to resume conduction.

4. The dead zone detection welding control method according to claim 1, characterized in that, When the rate of increase of the dead zone welding voltage exceeds the necking threshold, the control of turning off each switch includes: The second time value is used to control each switch to remain off.

5. The dead zone detection welding control method according to claim 1, characterized in that, Also includes: Obtain the working welding voltage and working welding current of the welding power source; The PWM control signal is modulated based on the working welding voltage and working welding current feedback. The method of controlling the turn-off of each switch to reduce the welding current of the welding power supply when the dead zone welding voltage meets the turn-off condition includes: The individual switching transistors are turned off by modulating the PWM control signal.

6. A welding machine system, characterized in that, It includes a power drive module and a control module, wherein the control module executes the dead zone detection welding control method as described in any one of claims 1 to 5.

7. A control device, characterized in that, The control device includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the dead zone detection welding control method according to any one of claims 1 to 5.

8. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the dead zone detection welding control method according to any one of claims 1 to 5.

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