Short circuit welding polarity switching method and device and readable storage medium

Abstract

The invention discloses a short circuit welding polarity switching method and device and a readable storage medium, and belongs to the technical field of welding. The method aims at solving the polarity switching problem of an existing negative polarity positive and negative wire feeding short circuit, and comprises the steps that when welding of a welding gun is initialized, the electrode polarity is adjusted to be positive, and the arcing state, the short circuit state and the arc striking state are detected; if positive arcing and successful arc striking are detected and a first short circuit state is detected, outputting a preset positive current value, controlling the wire feeding speed of positive wire feeding to be reduced to zero, then switching the electrode polarity to be negative, and outputting a preset negative current value for controlling reverse wire feeding, so that the wire feeding speed of reverse wire feeding is accelerated; and after the preset negative current value is maintained for a set time, output of the preset negative current value is stopped, and short-circuit welding is continuously conducted with the negative polarity of the electrode. The electrode polarity can be automatically switched and the welding current can be dynamically controlled according to the working condition of the welding gun, so that the electrode polarity is switched under the optimal condition, and meanwhile, the stability of an electric arc during electrode polarity switching is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to a short-circuit welding polarity switching method, device and readable storage medium, belonging to the technical field of welding. BACKGROUND

[0002] With the development of welding technology and automatic welding equipment, users have higher and higher requirements for welding quality and welding efficiency, which has led to rapid development of welding technology in recent years. Moreover, with the further development of lightweight, the material strength is getting bigger and bigger, and the workpiece thickness is getting smaller and smaller, and the scene of welding thin plates is also getting more and more, but the assembly precision of thin plates is relatively poor, which leads to relatively small adaptability of welding arc to gap, so it further leads to the invention of positive and negative wire feeding short-circuit welding technology. The positive and negative wire feeding short-circuit technology is to feed the wire forward in the arc stage and to pull the wire backward in the short-circuit stage, so as to periodically output the short-circuit stage and the arc stage. Although the positive and negative wire feeding short-circuit welding technology can reduce welding spatter and heat input and expand the welding field of thin plates and ultra-thin plates, the positive and negative wire feeding short-circuit technology usually adopts positive polarity for welding, that is, the welding wire adopts positive polarity and the base metal adopts negative polarity. For the gas tungsten arc welding, the heat input of positive polarity is larger than that of negative polarity, and the filling amount is smaller, so in order to further expand the welding field of thin plates and ultra-thin plates, the negative polarity positive and negative wire feeding short-circuit technology comes into being, and how to realize the negative polarity positive and negative wire feeding short-circuit becomes the key.

[0003] In the disclosed patent CN1775444A, a polarity switching method in the constant speed short-circuit welding process is invented, that is, after the initial short-circuit detection, the welding current is reduced to a low value in the pre-determined short-circuit initial period, then the output polarity of the welding current is switched after the end of the short-circuit initial period, and the welding current is increased to make it arc; in the national invention patent (CN106552984A), a positive and negative feeding alternating current arc welding polarity switching method is invented, in which the switching of the electrode polarity is set in the period of positive deceleration of the feeding speed in the positive feeding period. Since the molten pool oscillation is relatively violent in the initial short-circuit stage, it is easy to cause the occurrence of micro short-circuit, so the polarity switching in the period of positive deceleration of the feeding speed in the positive feeding period is easy to cause arc instability, so this scheme is not the best time for polarity switching. As for the negative polarity short-circuit welding technology of positive and negative wire feeding, there is no suitable polarity switching method at present.

[0004] Therefore, how to realize the negative polarity short-circuit welding technology of positive and negative wire feeding has become a technical problem to be solved by the technical personnel in the field. SUMMARY

[0005] The application aims to provide a short-circuit welding polarity switching method, device and readable storage medium, which can automatically set the electrode polarity and detect the state during the welding of a welding gun, automatically switch the electrode polarity and dynamically control the welding current according to the working condition of the welding gun, switch the electrode polarity in the best condition, ensure the stability of the arc during the switching of the electrode polarity, and finally ensure the continuity and stability of the negative polarity short-circuit welding process.

[0006] To solve the above technical problems, the application is implemented by using the following technical scheme.

[0007] The first aspect of the application provides a short-circuit welding polarity switching method, which comprises the following steps: After detecting the successful positive arc ignition and arc ignition, and when the first short-circuit state is detected, a preset positive current value is outputted; Based on the preset positive current value, the wire feeding speed of the positive wire feeding is controlled to decelerate until it is reduced to zero, the electrode polarity is switched to negative, and a preset negative current value is outputted; Based on the preset negative current value, the wire feeding speed of the reverse wire feeding is controlled to accelerate; After maintaining the preset negative current value for a set time, the preset negative current value is stopped, and the short-circuit welding is continuously performed with the negative electrode polarity, and the positive and reverse wire feedings are alternately controlled.

[0008] Optionally, the absolute values of the preset positive current value and the preset negative current value are equal, and the absolute values range from 5A to 49A and from 100A to 500A.

[0009] Optionally, based on the preset positive current value, the wire feeding speed of the positive wire feeding is controlled to decelerate until it is reduced to zero, and the method further comprises the following steps: The current welding current value is adjusted to the preset positive current value, so that the current welding current value is reduced to the preset positive current value and maintained for a first set time, thereby delaying the wire feeding speed of the positive wire feeding; The preset positive current value is continuously maintained for a second set time, so that the wire feeding speed of the positive wire feeding is reduced to zero.

[0010] Optionally, the switching of the electrode polarity to negative and the outputting of the preset negative current value further comprise the following steps: When the positive wire feeding is reduced to zero or after a certain time delay after the positive wire feeding is reduced to zero, the electrode polarity is switched to negative for controlling the reverse wire feeding.

[0011] Optionally, the time from the first short-circuit state to the switching of the electrode polarity to negative is less than 1.0ms.

[0012] Optionally, based on the preset negative current value, the wire feeding speed of the reverse wire feeding is controlled to accelerate, and the method further comprises the following steps: After the electrode polarity is switched to negative, the current welding current value is adjusted based on a preset negative current value, so that the acceleration of the wire feeding speed of the reverse wire feeding is controlled.

[0013] Optionally, the preset negative current value is maintained for a set time, and then the output of the preset negative current value is stopped, and the short circuit welding is continuously performed with the electrode negative polarity, and the positive and reverse wire feeding is alternately controlled, including: After the preset negative current value is maintained for a third set time, the output of the preset negative current value is stopped, and the welding current value continues to increase from the preset negative current value until an arc is generated; Before the arc is generated, the wire feeding speed of the reverse wire feeding is accelerated for a fourth set time until the speed upper limit value, and then the acceleration is stopped; After the arc is generated, the wire feeding speed of the reverse wire feeding is maintained at the speed upper limit value for a fifth set time; After the arc is generated, the welding current value starts to decrease, and the wire feeding speed of the reverse wire feeding is stopped from being maintained after the fifth set time, so that the wire feeding speed of the reverse wire feeding is decelerated from the speed upper limit value to zero, and the positive and reverse wire feeding and the wire feeding speed are continuously controlled with the electrode negative polarity.

[0014] Optionally, the absolute value of the welding current value fluctuates within a fixed range reference value before and after the electrode polarity is switched, during the acceleration of the reverse wire feeding, and before the short circuit is detected; wherein the current absolute value fluctuation range before and after the electrode polarity is switched is 5A-49A, the current absolute value fluctuation range during the acceleration of the reverse wire feeding is 5A-200A, and the current absolute value fluctuation range before the short circuit is detected is 5A-200A.

[0015] The second aspect of the present application provides a short circuit welding polarity switching device, comprising: An initialization module is configured to adjust the electrode polarity to positive during the welding gun welding initialization, and detect the arc state, the short circuit state and the arc ignition state; A polarity switching and current control module is configured to output a preset positive current value when the positive arc ignition and the arc ignition are successfully detected, and the first short circuit state is detected; based on the preset positive current value, the wire feeding speed of the positive wire feeding is decelerated until the deceleration is to zero, the electrode polarity is switched to negative, and the preset negative current value is output; based on the preset negative current value, the reverse wire feeding is controlled, so that the wire feeding speed of the reverse wire feeding is accelerated; A welding execution module is configured to maintain the preset negative current value for a set time, and then stop the output of the preset negative current value, and continuously perform the short circuit welding with the electrode negative polarity, and alternately control the positive and reverse wire feeding.

[0016] The third aspect of the present application provides a non-transitory computer readable storage medium, which stores computer device readable instructions, when executed by at least one processor, so that the short circuit welding polarity switching method as described in the first aspect is executed.

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: 1. During torch welding, electrode polarity is set and status is detected, so that the electrode polarity is automatically switched and the welding current is dynamically controlled according to the working condition of the welding torch. This ensures that the electrode polarity is switched under the best conditions while maintaining the stability of the arc during the switching of electrode polarity, and ultimately ensures the continuity and stability of the negative polarity short-circuit welding process.

[0018] 2. During the period when the wire feed speed is accelerating during the electrode polarity switching setting in the reverse feed phase, and before and after the short circuit detection and polarity switching, the absolute value of the welding current is controlled to fluctuate within a certain range of reference values ​​to ensure that the welding heat input remains relatively stable during the polarity switching process, and to avoid excessive current changes affecting the welding quality. Attached Figure Description

[0019] Figure 1 The diagram shown is a flowchart of the short-circuit welding polarity switching of the present invention; Figure 2 The figure shown is a time-series diagram of electrode polarity, wire feed speed, current and voltage in a short-circuit welding polarity switching embodiment of the present invention. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention. Example

[0021] This embodiment provides a method for switching polarity during short-circuit welding, such as... Figure 1 The following are included: Step 1: During welding torch initialization, adjust the electrode polarity to positive and check the arc ignition status, short circuit status, and arc ignition status; Step 2: After detecting positive arcing and successful arc ignition, and upon detecting the first short circuit, output a preset positive current value; Step 3: Based on the preset positive current value, control the wire feeding speed of the forward wire feed to decelerate until it decelerates to zero. Then, switch the electrode polarity to negative and output the preset negative current value. Step 4: Control the reverse wire feeding based on the preset negative current value to accelerate the wire feeding speed of the reverse wire feeding; Step 5: Maintain the preset negative current value until the set time, then stop the output of the preset negative current value and continue short-circuit welding with the electrode negative polarity, controlling the alternation of positive and negative wire feeding.

[0022] In some possible implementations, the absolute values ​​of the preset positive current value and the preset negative current value are equal, and the absolute values ​​range from 5A to 49A and from 100 to 500A.

[0023] In some possible embodiments, controlling the wire feeding speed of the forward wire feeding to decelerate based on a preset forward current value until it decelerates to zero further includes: Adjusting the current welding current value with the preset forward current value, so that the current welding current value is reduced to the preset forward current value and the preset forward current value is maintained within a first set time, thereby delaying the wire feeding speed of the forward wire feeding; Continuing the preset forward current value within a second set time to decelerate the forward wire feeding speed to zero.

[0024] As Figure 2 shown, in the figure, t1, t2, t3, t4, t5, t6, t7, t8, t9, and t10 are respectively the time points of the sequential changes of various signals of electrode polarity, wire feeding speed, current, and voltage when the forward arc ignition and arc starting are detected and when the first short - circuit state is detected (at time t1). I1 and I2 are respectively the preset forward current value and the preset negative current value; the first set time in the figure is t12 (the time from time t1 to time t2), 0 < t12 < 1.0 ms. Thus, the preset forward current value is maintained within t12 to provide a smooth transition for the deceleration of the forward wire feeding speed, optimize arc stability, reduce spatter, and ensure the weld formation quality.

[0025] The second set time in the figure is t23, 0 < t23 < 1.0 ms (the time from time t2 to time t3). During this period, the current value remains at I1, and the forward wire feeding speed is decelerated to zero.

[0026] In some possible embodiments, switching the electrode polarity to negative and outputting a preset negative current value further includes: When the forward wire feeding decelerates to zero or after the forward wire feeding decelerates to zero and delays for a certain time, switching the electrode polarity to negative is used to control the reverse wire feeding.

[0027] In some possible embodiments, as Figure 2 in, when the forward wire feeding decelerates to zero and delays for a certain time t34, 0 < t34 < 1.0 ms (the time from time t3 to time t4). t14 is the time from the first short - circuit occurrence at time t1 to time t4 before the electrode polarity changes from positive to negative. t14 is the sum of the first set time t12, the second set time t23, and the time t34 when the forward wire feeding decelerates to zero and delays for a certain time, and the range of t14 is less than 1.0 ms.

[0028] In some possible embodiments, controlling the reverse wire feeding based on a preset negative current value to accelerate the wire feeding speed of the reverse wire feeding further includes: After the electrode polarity is switched to negative, adjusting the current welding current value based on the preset negative current value to accelerate the wire feeding speed of the reverse wire feeding from zero.

[0029] In some possible implementations, the preset negative current value is maintained for a set time, then the preset negative current value output is stopped, and short-circuit welding is continuously performed with the electrode negative polarity, controlling the alternation of positive and negative wire feeding, including: After maintaining the preset negative current value for the third set time, the output of the preset negative current value is stopped, and the welding current value continues to increase from the preset negative current value until an arc is generated. Before the arc is generated, the wire feeding speed of the reverse wire feed is accelerated within a fourth set time until the upper limit of the reverse wire feeding speed is reached and then the acceleration stops. After the arc is generated, the wire feeding speed of the reverse wire feed is maintained at the upper limit value for a fifth set time period. After the arc is generated, the welding current value begins to decrease. The wire feeding speed of the reverse wire feed is no longer limited by the upper speed limit and begins to be delayed, so that the wire feeding speed of the reverse wire feed is reduced from the upper speed limit to zero, and the forward and reverse wire feed and wire feeding speed are continuously controlled by the negative polarity of the electrode.

[0030] This embodiment is in Figure 2 The third setting time is t45, which ranges from 0 to 1.0 ms (the time from t4 to t5). Starting from t45, the wire feed is accelerated to switch the electrode polarity to negative polarity. Before the polarity switch, the current value remains constant at I1. After the polarity switch, the current value starts to output I2. After the I2 current value stops outputting, the welding current value increases without being controlled and an arc is generated.

[0031] Figure 2 The fourth set time is t56 (time from t5 to t6), and the fifth set time is t67 (time from t6 to t7). The wire feeding speed of the reverse feed accelerates to the upper speed limit within the fourth set time and then stops accelerating, maintaining the upper speed limit within the fifth set time. The fourth set time is t56, and the fifth set time is t67. There are no restrictions on the fourth set time and it can be adjusted according to the specific workpiece.

[0032] like Figure 2 As shown, t78 is the time for arc generation. The time limit of t78 is 0~2.0ms (the time from t7 to t8). Within t78, the welding current value begins to decrease. Beyond t78, the wire feeding speed of the reverse wire feed is not limited by the upper limit of the speed, so that the wire feeding speed of the reverse wire feed decelerates to zero within the time limit of t89. The time limit of t89 is 0~2.0ms (the time from t8 to t9). The forward wire feed is continuously controlled by the negative polarity of the electrode, so that the forward wire feed speed reaches the upper limit of the speed within t910 (the time from t9 to t10) and is maintained for a certain period of time before entering the reverse wire feed alternation. The time limit of t910 is also 0~2.0ms.

[0033] In some possible implementations, the absolute value of the welding current fluctuates within a fixed reference range before and after electrode polarity switching, during the reverse wire feeding acceleration process, and before short-circuit detection. Specifically, the fluctuation range before and after electrode polarity switching is 5A-49A, the fluctuation range during the reverse wire feeding acceleration process is 5A-200A, and the fluctuation range before short-circuit detection is 5A-200A. The electrode polarity switching is set within the wire feeding speed during the reverse feeding period, and the time from short-circuit detection and the absolute value of the welding current at the time of switching are both within a certain reference range, which ensures the stability during electrode polarity switching. Example

[0034] This embodiment provides a short-circuit welding polarity switching device, including: an initialization module, a polarity switching and current control module, and a welding execution module. The initialization module is used to adjust the electrode polarity to positive and detect the arc ignition status, short circuit status and arc ignition status during the welding torch initialization process. The polarity switching and current control module is used to output a preset positive current value after detecting positive arcing and successful arc ignition, and when detecting the first short circuit state; based on the preset positive current value, it controls the wire feeding speed of the forward wire feed to decelerate until it decelerates to zero, then switches the electrode polarity to negative and outputs a preset negative current value; based on the preset negative current value, it controls the reverse wire feed to accelerate the wire feeding speed of the reverse wire feed. The welding execution module is used to maintain the preset negative current value until the set time, then stop the output of the preset negative current value, and continue to perform short-circuit welding with the electrode negative polarity, controlling the alternation of positive and negative wire feeding. Example

[0035] This embodiment provides a non-transitory computer-readable storage medium storing computer device-readable instructions that, when executed by at least one processor, cause the following short-circuit welding polarity switching method to be performed: During welding torch initialization, adjust the electrode polarity to positive and check the arc ignition status, short circuit status, and arc ignition status. After detecting positive arcing and successful arc ignition, and upon detecting the first short circuit, a preset positive current value is output. Based on the preset positive current value, the wire feeding speed is controlled to decelerate until it decelerates to zero. Then, the electrode polarity is switched to negative and the preset negative current value is output. The reverse wire feeding is controlled based on a preset negative current value, which accelerates the wire feeding speed of the reverse wire feeding. The preset negative current value is maintained for a set time, then the preset negative current value output stops, and short-circuit welding is continuously performed with the electrode negative polarity, controlling the alternation of positive and negative wire feeding.

[0036] In summary, this invention enables electrode polarity setting and status detection during torch welding, thereby automatically switching electrode polarity and dynamically controlling the welding current based on the torch's operating conditions. This ensures optimal electrode polarity switching while maintaining arc stability during polarity transitions, ultimately guaranteeing the continuity and stability of the negative polarity short-circuit welding process. Furthermore, during the electrode polarity switching phase, when the wire feed speed is accelerating in the reverse feed period, and considering the time elapsed since short-circuit detection and before and after the polarity switch, the absolute value of the welding current is controlled to fluctuate within a certain reference range. This ensures relatively stable welding heat input during polarity switching, preventing excessive current fluctuations from affecting welding quality.

[0037] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0038] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0039] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0040] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0041] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A short circuit welding polarity switching method characterized by, The method comprises the following steps: When the welding gun is initialized, the electrode polarity is adjusted to be positive, and the arc ignition state, short circuit state and arc ignition state are detected; After detecting the positive arc ignition and successful arc ignition, and when detecting the first short circuit state, a preset positive current value is outputted; Based on the preset positive current value, the wire feeding speed of the positive wire feeding is controlled to slow down until it slows down to zero, the electrode polarity is switched to negative, and a preset negative current value is outputted; Based on the preset negative current value, the wire feeding speed of the reverse wire feeding is controlled to speed up; The preset negative current value is maintained for a set time, then the preset negative current value output is stopped, and the short circuit welding is continuously performed with the electrode negative polarity to control the positive and reverse wire feeding alternately.

2. The short-circuit welding polarity switching method according to claim 1, characterized in that, The absolute values of the preset positive current value and the preset negative current value are equal, and the absolute values are in the range of 5A-49A and 100-500A.

3. The short-circuit welding polarity switching method according to claim 1, characterized by, Based on the preset positive current value, the wire feeding speed of the positive wire feeding is controlled to slow down until it slows down to zero, which further comprises the following steps: The current welding current value is adjusted to the preset positive current value, so that the current welding current value is reduced to the preset positive current value and maintained for a first set time, thereby delaying the wire feeding speed of the positive wire feeding; The preset positive current value is continuously maintained for a second set time, so that the wire feeding speed of the positive wire feeding slows down to zero.

4. The short-circuit welding polarity switching method according to claim 1, characterized by, Switching the electrode polarity to negative and outputting the preset negative current value further comprises the following steps: When the wire feeding speed of the positive wire feeding slows down to zero or after a certain time delay, the electrode polarity is switched to negative to control the reverse wire feeding.

5. The short-circuit weld polarity switching method of claim 1 wherein, The time from the first short circuit state to the switching of the electrode polarity to negative is less than 1.0ms.

6. The short-circuit weld polarity switching method of claim 1 wherein, Based on the preset negative current value, the wire feeding speed of the reverse wire feeding is controlled to speed up, which further comprises the following steps: After the electrode polarity is switched to negative, the current welding current value is adjusted based on the preset negative current value, so that the wire feeding speed of the reverse wire feeding is accelerated.

7. The short-circuit weld polarity switching method of claim 1 wherein, The preset negative current value is maintained for a set time, then the preset negative current value output is stopped, and the short circuit welding is continuously performed with the electrode negative polarity to control the positive and reverse wire feeding alternately, which comprises the following steps: After the preset negative current value is maintained for a third set time, the preset negative current value output is stopped, and the welding current value continues to increase from the preset negative current value until an arc is generated; Before the arc is generated, the wire feeding speed of the reverse wire feeding is controlled to accelerate within a fourth set time until a speed upper limit value is reached, and then the acceleration is stopped; After the arc is generated, the wire feeding speed of the reverse wire feeding is maintained at the speed upper limit value within a fifth set time; After the arc is generated, the welding current value starts to decrease, and after exceeding the fifth set time, the wire feeding speed control of the reverse wire feeding is stopped, so that the wire feeding speed of the reverse wire feeding slows down to zero, and the positive and reverse wire feedings and the wire feeding speeds are continuously controlled with the electrode negative polarity.

8. The short-circuit weld polarity switching method of claim 1 wherein, The absolute value of the welding current value fluctuates within a fixed range reference value before and after the switching of the electrode polarity, during the acceleration of the reverse wire feeding, and before the detection of the short circuit; wherein the current absolute value fluctuation range before and after the switching of the electrode polarity is 5A-49A, the current absolute value fluctuation range during the acceleration of the reverse wire feeding is 5A-200A, and the current absolute value fluctuation range before the detection of the short circuit is 5A-200A.

9. A short circuit welding polarity switching device, characterized in that it comprises: The initialization module is configured to adjust the polarity of the electrode to be positive and detect an arc ignition state, a short circuit state and an arc ignition state when the welding gun is initialized for welding; The polarity switching and current control module is configured to output a preset positive current value when the positive arc ignition and the arc ignition are successfully detected and the first short circuit state is detected; control the wire feeding speed of the positive wire feeding to be decelerated based on the preset positive current value, until the wire feeding speed is decelerated to zero, switch the polarity of the electrode to be negative and output a preset negative current value; control the wire feeding speed of the reverse wire feeding to be accelerated based on the preset negative current value; The welding execution module is configured to maintain the preset negative current value for a set time, stop the output of the preset negative current value, and continue the short circuit welding with the negative polarity of the electrode, and control the positive and reverse wire feeding to be alternated.

10. A non-transitory computer-readable storage medium storing The computer device readable instructions, when executed by at least one processor, cause the short circuit welding polarity switching method of any one of claims 1 to 8 to be executed.

Images