Current control method and device for pulse arc welding and computer storage medium

Abstract

The invention provides a current control method for pulse arc welding, which comprises the following steps of: acquiring a current pulse control period, controlling an output current based on a preset pulse waveform, and calculating a voltage average value of the current pulse control period at each moment and a deviation ratio of the voltage average value to a preset voltage value; if the deviation ratio is greater than 1.05 or the deviation ratio is less than or equal to 1.05 and the output current of the pulse waveform at the current moment is equal to the base value current, continuing to perform current control according to the preset pulse waveform; and if the deviation ratio is less than or equal to 1.05 and the current at the current moment is not equal to the base value current, controlling the pulse waveform to output a plurality of transition currents which are reduced step by step under the condition of ensuring the voltage stability, and reducing the output current of the pulse waveform to the base value current step by step before the end of the current pulse control period. And large particle splashing caused by relatively large output current of the pulse waveform when the current pulse control period is finished is avoided.

Description

Technical Field

[0001] The invention relates to a current control method and device for pulse arc welding and a computer storage medium, belonging to the field of pulse consumable gas shielded welding. Background Art

[0002] Under normal working conditions, the fine spatter generated during welding does not adhere to the surface of the workpiece and has no effect on the appearance of the weld, which is normal. However, large particle spatter tends to adhere to the periphery of the weld, affecting the appearance of the workpiece and requiring grinding and cleaning, increasing workload and affecting production efficiency.

[0003] In the process of melting electrode pulse welding, constant voltage control is generally used. The core content of this solution is: in the arc control cycle, the current is output according to the control method while the voltage average value is calculated. When the calculated voltage average value is equal to the preset voltage, the current pulse cycle ends and the next pulse cycle begins. If they are not equal, the current state is maintained until the voltage average value is equal to the preset voltage.

[0004] Under normal circumstances, the next pulse cycle begins when the current is at the base value stage during the entire pulse cycle. At this time, there is no spatter or fine spatter is produced. However, due to objective reasons, adjustments are generally present in the welding process, that is, the moment when the calculated voltage average value is equal to the preset voltage is not absolutely the same. If the current is not at the base value stage when this moment occurs, large particle spatter is likely to occur. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a current control method for pulse arc welding. Under the condition of basically ensuring voltage stability, the output current is gradually reduced to the base current before the end of the current pulse control cycle to avoid the generation of large particle splashing.

[0006] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0007] In a first aspect, the present invention provides a current control method for pulse arc welding, comprising:

[0008] Collect the current pulse control cycle, control the output current based on the preset pulse waveform, calculate the voltage average value of the current pulse control cycle at each moment and the deviation ratio between the voltage average value and the preset voltage value;

[0009] Determine the relationship between the deviation ratio of the voltage average value to the preset voltage value and the preset first threshold value, and whether the output current of the pulse waveform at the current moment is equal to the base current:

[0010] In response to the deviation ratio between the voltage average value and the preset voltage value being greater than a preset first threshold value, continuing to perform current control according to a preset pulse waveform;

[0011] In response to the deviation ratio between the voltage average value and the preset voltage value being less than or equal to a preset first threshold value and the output current of the pulse waveform at the current moment being equal to the base current, the current control continues according to the preset pulse waveform;

[0012] In response to the deviation ratio between the voltage average value and the preset voltage value being less than or equal to a preset first threshold value and the current at the current moment is not equal to the base current, the pulse waveform is controlled to output a plurality of gradually decreasing transition currents, and the output current of the pulse waveform is gradually reduced to the base current before the end of the current pulse control cycle.

[0013] Furthermore, after the output current of the pulse waveform is gradually reduced to the base current, the method further includes:

[0014] Recalculate and obtain a new voltage average value and a deviation ratio between the new voltage average value and a preset voltage value;

[0015] Determine the relationship between the deviation ratio of the new voltage average value to the preset voltage value and a preset first threshold and a second threshold, wherein the second threshold is smaller than the first threshold;

[0016] In response to the deviation ratio between the new voltage average value and the preset voltage value being less than or equal to the second threshold, the current pulse control cycle is ended, the next cycle is entered, and the output current is controlled again according to the preset pulse waveform;

[0017] In response to the deviation ratio between the voltage average value and the preset voltage value being greater than the second threshold and less than or equal to the first threshold, the current average value of the current control cycle and the deviation ratio between the current average value and the preset current value are calculated, and the output current of the preset pulse waveform is adjusted according to the deviation ratio between the current average value and the preset current value.

[0018] Furthermore, adjusting the output current of the preset pulse waveform according to the deviation ratio between the current average value and the preset current value includes:

[0019] Determine the relationship between the deviation ratio of the current average value and the preset current value and a preset third threshold value;

[0020] In response to the deviation ratio between the current average value and the preset current value being less than or equal to a preset third threshold value, controlling the pulse waveform to output a base current;

[0021] In response to the deviation ratio between the current average value and the preset current value being greater than a preset third threshold value, the pulse waveform is controlled to output a preset arc-maintaining minimum current.

[0022] Furthermore, the preset pulse waveform also includes: a second base current, and the base current < the second base current < the peak current; the control pulse waveform outputs a plurality of gradually decreasing transition currents, and the output current of the pulse waveform is gradually reduced to the base current before the end of the current pulse control cycle, including:

[0023] In response to the base current being less than the output current of the pulse waveform at the current moment being less than the second base current, the pulse waveform is controlled to output a gradually decreasing transition currents to adjust the output current of the pulse waveform at the current moment down to the base current;

[0024] In response to the second base current being ≤ the output current of the pulse waveform at the current moment being < the peak current, the pulse waveform is controlled to first output b gradually decreasing transition currents to adjust the output current of the pulse waveform at the current moment down to the second base current, and then the pulse waveform is controlled to output c gradually decreasing transition currents to adjust the second base current down to the base current;

[0025] In response to the output current of the pulse waveform at the current moment being equal to the peak current, the pulse waveform is controlled to first output d gradually decreasing transition currents to adjust the output current of the pulse waveform from the peak current to the second base current, and then the pulse waveform is controlled to output c gradually decreasing transition currents to adjust the output current from the second base current to the base current;

[0026] Among them, a<b+c<d+c.

[0027] Furthermore, the output current of the pulse waveform at the current moment affects the setting of the third threshold value. The larger the output current of the pulse waveform at the current moment, the larger the third threshold value.

[0028] Furthermore, the first threshold is 1.05; the second threshold is 0.95; and the minimum arc-maintaining current is 25A.

[0029] In a second aspect, the present invention provides a current control device for pulse arc welding, comprising: a calculation module, used to calculate the voltage average value of the current pulse control cycle at each moment and the deviation ratio of the voltage average value to a preset voltage value; a judgment module, used to judge the magnitude relationship between the deviation ratio of the voltage average value to the preset voltage value and a preset first threshold value, and whether the output current of the pulse waveform at the current moment is equal to the base value current;

[0030] The adjusting module is used to adjust the output current of the preset pulse waveform; the controlling module is used to control the output current of the pulse waveform.

[0031] Furthermore, the calculation module is also used to calculate the current average value of the current control cycle and the deviation ratio of the current average value to the preset current value; the judgment module is also used to judge the relationship between the deviation ratio of the new voltage average value to the preset voltage value and the preset first threshold and second threshold, and the relationship between the deviation ratio of the current average value to the preset current value and the preset third threshold.

[0032] In a third aspect, the present invention provides a computer device comprising: a processor and a memory; wherein the processor runs a program corresponding to the executable program code by reading the executable program code stored in the memory, so as to implement the current control method of pulse arc welding as described in the first aspect.

[0033] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the current control method for pulse arc welding as described in the first aspect.

[0034] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention monitors the deviation between the voltage average value of the current pulse control cycle and the preset voltage during the entire pulse control cycle, and when the voltage average value of the current pulse control cycle is approximately equal to the preset voltage and satisfies the cycle end condition, identifies the output current of the pulse waveform at the current moment, and if the output current of the pulse waveform at the current moment is in the base value stage, the current pulse control cycle is successfully ended and the next cycle is entered, and the output current is re-controlled according to the preset pulse waveform; if it is identified that the output current of the pulse waveform at the current moment is in the non-base value stage, the pulse waveform is controlled to output a plurality of gradually decreasing transition currents while ensuring voltage stability, and the output current of the pulse waveform is gradually reduced to the base value current before the end of the current pulse control cycle, so as to avoid large particle splashing caused by a large output current of the pulse waveform at the end of the current pulse control cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the pulse control cycle provided in Example 2 of the present invention. DETAILED DESCRIPTION

[0036] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices. The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0037] Example 1

[0038] This embodiment provides a current control method for pulse arc welding, comprising:

[0039] S01: Collect the current pulse control cycle, control the output current based on the preset pulse waveform, calculate the voltage average value of the current pulse control cycle at each moment and the deviation ratio between the voltage average value and the preset voltage value.

[0040] It should be noted that the deviation ratio represents the degree of proximity between the voltage average value of the current pulse control cycle and the preset voltage value. When the voltage average value of the current pulse control cycle is approximately equal to the preset voltage, the cycle end condition is met and the preparation stage for ending the current pulse control cycle begins.

[0041] S02: Determine the relationship between the deviation ratio of the voltage average value to the preset voltage value and the preset first threshold value, and whether the output current of the pulse waveform at the current moment is equal to the base current.

[0042] Taking the calculation error into consideration, in this embodiment, the first threshold is set to 1.05. If the deviation ratio is less than or equal to 1.05, the pulse control cycle end condition is met and the preparation stage for ending the current pulse control cycle is entered. If the deviation ratio is less than or equal to 0.95, the current pulse control cycle is ended and the next pulse control cycle is entered.

[0043] If the calculated deviation ratio between the voltage average value of the current pulse control cycle and the preset voltage value is greater than 1.05, the pulse control cycle end condition is not met, and current control continues to be performed according to the preset pulse waveform.

[0044] If the calculated deviation ratio between the voltage average value of the current pulse control cycle and the preset voltage value is less than or equal to 1.05, the pulse control cycle end condition is met, and the process enters S03.

[0045] S03: Identify the output current of the pulse waveform at the current moment, and determine the stage of the pulse control cycle at the current moment by the output current of the pulse waveform at the current moment:

[0046] If the output current of the pulse waveform at the current moment is equal to the base current, it means that the current moment is in the base phase of the pulse control cycle, and there is no need to adjust the preset pulse waveform, and current control continues according to the preset pulse waveform.

[0047] If the output current of the pulse waveform at the current moment is not equal to the base value current, it means that the current moment is in the non-base value stage of the pulse control cycle, and the preset pulse waveform needs to be adjusted according to the output current of the pulse waveform at the current moment.

[0048] Specifically, the adjustment of the preset pulse waveform includes: controlling the pulse waveform to output multiple gradually decreasing transition currents, and gradually reducing the output current of the pulse waveform to the base current before the end of the current pulse control cycle, so as to avoid large particle splashing caused by the large output current of the pulse waveform at the end of the current pulse control cycle.

[0049] It should be noted that the amount of the transition current is set according to the stage of the pulse control cycle at the current moment.

[0050] Specifically, the preset pulse waveform further includes: a second base current, and the base current < the second base current < the peak current;

[0051] If the base current is less than the output current of the pulse waveform at the current moment and less than the second base current, the pulse waveform is controlled to output a gradually decreasing transition current to adjust the output current of the pulse waveform at the current moment down to the base current;

[0052] If the second base current is less than or equal to the output current of the pulse waveform at the current moment and less than the peak current, the pulse waveform is controlled to first output b gradually decreasing transition currents to reduce the output current of the pulse waveform at the current moment to the second base current, and then the pulse waveform is controlled to output c gradually decreasing transition currents to reduce the second base current to the base current;

[0053] If the output current of the pulse waveform at the current moment = the peak current, the pulse waveform is controlled to first output d gradually decreasing transition currents to reduce the output current of the pulse waveform from the peak current to the second base current, and then the pulse waveform is controlled to output c gradually decreasing transition currents to reduce the second base current to the base current; wherein, a<b+c<d+c.

[0054] Optionally, after the output current of the pulse waveform is gradually reduced to the base current, it also includes: recalculating a new voltage average value and a deviation ratio between the new voltage average value and a preset voltage value; judging the relationship between the deviation ratio between the new voltage average value and the preset voltage value and a preset first threshold and a second threshold, wherein the second threshold is smaller than the first threshold.

[0055] Specifically, in this embodiment, the second threshold is set to 0.95. If the deviation ratio between the new voltage average value and the preset voltage value is less than or equal to 0.95, the current pulse control cycle is ended and the next cycle is entered to control the output current again according to the preset pulse waveform.

[0056] If the deviation ratio between the voltage average value and the preset voltage value is greater than 0.95 and less than or equal to 1.05, the current average value of the current control cycle and the deviation ratio between the current average value and the preset current value are calculated, and the output current of the preset pulse waveform is adjusted according to the deviation ratio between the current average value and the preset current value.

[0057] Specifically, adjusting the output current of the preset pulse waveform according to the deviation ratio between the current average value and the preset current value includes:

[0058] Determine the relationship between the deviation ratio of the current average value and the preset current value and a preset third threshold value; in response to the deviation ratio of the current average value and the preset current value being less than or equal to the preset third threshold value, control the pulse waveform to output a base current; in response to the deviation ratio of the current average value and the preset current value being greater than the preset third threshold value, control the pulse waveform to output a preset minimum current for maintaining the arc.

[0059] Example 2

[0060] like Figure 1 As shown, a pulse control cycle is divided into a base value stage and a non-base value stage, wherein the non-base value stage includes: from the beginning of the current pulse control cycle to the current reaching the peak value is stage T1, the current maintains the peak value is stage T2, the current drops from the peak value to the second base value current and maintains the second base value current is stage T3, the current drops from the second base value current to the base value current is stage T4, and the current maintains the base value is stage T5.

[0061] On the basis of Embodiment 1, this embodiment provides a current control method for identifying that the current moment is in the T4 stage when the pulse control cycle end condition is met.

[0062] Specifically, if the current moment is in the T4 stage, adjusting the preset pulse waveform includes:

[0063] S11: Control pulse waveform to output 3 transition currents in sequence: , , ,in:

[0064]

[0065]

[0066]

[0067] in, is the output current of the pulse waveform at the current moment, is the base current.

[0068] S12: After adjusting the output current of the pulse waveform to the base current, continue to calculate the deviation ratio between the average voltage value and the preset voltage value at each moment of monitoring, including:

[0069] If the deviation ratio between the voltage average value and the preset voltage value is less than or equal to 0.95, the current pulse control cycle ends and the next cycle begins, and the output current is controlled again according to the preset pulse waveform;

[0070] If the deviation ratio between the voltage average value and the preset voltage value is greater than 0.95 and less than or equal to 1.05, the current average value of the current control cycle and the deviation ratio between the current average value and the preset current value are calculated. If the deviation ratio between the current average value and the preset current value is less than or equal to the preset threshold value 1.1, the base current IBA is continued to be output in the control pulse waveform; if the deviation ratio between the current average value and the preset current value is greater than the preset threshold value 1.1, the control pulse waveform output can maintain the minimum current of the arc.

[0071] It should be noted that when setting the preset threshold, the output current of the pulse waveform at the current moment needs to be considered. The larger the output current of the pulse waveform at the current moment, the larger the preset threshold.

[0072] Optionally, the minimum current that can sustain the arc is 25A.

[0073] Example 3

[0074] On the basis of Embodiment 2, this embodiment provides a current control method for identifying that the current moment is in the T3 stage when the pulse control cycle end condition is met.

[0075] Specifically, if the current moment is in the T3 stage, adjusting the preset pulse waveform includes:

[0076] S21: Control pulse waveform to output 4 transition currents in sequence: , , , ,in:

[0077]

[0078]

[0079]

[0080]

[0081] in, is the second base current.

[0082] S22: After adjusting the output current of the pulse waveform to the base current, continue to calculate the deviation ratio between the average voltage value and the preset voltage value at each moment of monitoring, including:

[0083] If the deviation ratio between the voltage average value and the preset voltage value is less than or equal to 0.95, the current pulse control cycle ends and the next cycle begins, and the output current is controlled again according to the preset pulse waveform;

[0084] If the deviation ratio of the voltage average value to the preset voltage value is greater than 0.95 and less than or equal to 1.05, the current average value of the current control cycle and the deviation ratio of the current average value to the preset current value are calculated. If the deviation ratio of the current average value to the preset current value is less than or equal to the preset threshold value of 1.15, the base current IBA is continued to be output in the control pulse waveform; if the deviation ratio of the current average value to the preset current value is greater than the preset threshold value of 1.15, the control pulse waveform output can maintain the minimum current of the arc.

[0085] Example 4

[0086] On the basis of Embodiment 2, this embodiment provides a current control method for identifying that the current moment is in the T2 stage when the pulse control cycle end condition is met.

[0087] Specifically, if the current moment is in the T2 stage, adjusting the preset pulse waveform includes:

[0088] S31: Control pulse waveform to output 5 transition currents in sequence: , , , , ,in:

[0089]

[0090]

[0091]

[0092]

[0093]

[0094] in, is the peak current.

[0095] S32: After adjusting the output current of the pulse waveform to the base current, continue to calculate the deviation ratio between the average voltage value and the preset voltage value at each moment of monitoring, including:

[0096] If the deviation ratio between the voltage average value and the preset voltage value is less than or equal to 0.95, the current pulse control cycle ends and the next cycle begins, and the output current is controlled again according to the preset pulse waveform;

[0097] If the deviation ratio between the voltage average value and the preset voltage value is greater than 0.95 and less than or equal to 1.05, the current average value of the current control cycle and the deviation ratio between the current average value and the preset current value are calculated. If the deviation ratio between the current average value and the preset current value is less than or equal to the preset threshold value 1.2, the base current IBA is continued to be output in the control pulse waveform; if the deviation ratio between the current average value and the preset current value is greater than the preset threshold value 1.2, the control pulse waveform output can maintain the minimum current of the arc.

[0098] Example 5

[0099] The present embodiment provides a current control device for pulse arc welding, including: a calculation module, used to calculate the voltage average value of the current pulse control cycle at each moment and the deviation ratio of the voltage average value to a preset voltage value; a judgment module, used to judge the relationship between the deviation ratio of the voltage average value to the preset voltage value and a preset first threshold value, and whether the output current of the pulse waveform at the current moment is equal to the base current; an adjustment module, used to adjust the output current of the preset pulse waveform; and a control module, used to control the output current of the pulse waveform.

[0100] Optionally, the calculation module is also used to calculate the current average value of the current control cycle and the deviation ratio of the current average value to a preset current value; the judgment module is also used to judge the relationship between the deviation ratio of the new voltage average value to the preset voltage value and the preset first threshold and second threshold, and the relationship between the deviation ratio of the current average value to the preset current value and the preset third threshold.

[0101] Example 6

[0102] This embodiment provides a computer device, including: a processor and a memory; wherein the processor runs a program corresponding to the executable program code by reading the executable program code stored in the memory, so as to implement the current control method of pulse arc welding as described in any one of Embodiments 1-4.

[0103] Example 7

[0104] This embodiment provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the current control method for pulse arc welding as described in any one of Embodiments 1-4 is implemented.

[0105] The storage medium may include, for example, a storage component of a tablet computer, a hard disk of a computer, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a portable compact disk read-only memory (CD-ROM), a USB memory, or any combination of the above storage media. The computer storage medium may be any combination of one or more computer storage media.

[0106] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A current control method for pulse arc welding, characterized in that: include: Collect the current pulse control cycle, control the output current based on the preset pulse waveform, calculate the voltage average value of the current pulse control cycle at each moment and the deviation ratio between the voltage average value and the preset voltage value; Determine the relationship between the deviation ratio of the voltage average value to the preset voltage value and the preset first threshold value, and whether the output current of the pulse waveform at the current moment is equal to the base current: In response to the deviation ratio between the voltage average value and the preset voltage value being greater than a preset first threshold value, continuing to perform current control according to a preset pulse waveform; In response to the deviation ratio between the voltage average value and the preset voltage value being less than or equal to a preset first threshold value and the output current of the pulse waveform at the current moment being equal to the base current, the current control continues according to the preset pulse waveform; In response to the deviation ratio between the voltage average value and the preset voltage value being less than or equal to a preset first threshold value and the current at the current moment is not equal to the base current, the pulse waveform is controlled to output a plurality of gradually decreasing transition currents, and the output current of the pulse waveform is gradually reduced to the base current before the end of the current pulse control cycle.

2. The current control method for pulse arc welding according to claim 1, characterized in that: After the output current of the pulse waveform is gradually reduced to the base current, the method further includes: Recalculate and obtain a new voltage average value and a deviation ratio between the new voltage average value and a preset voltage value; Determine the relationship between the deviation ratio of the new voltage average value to the preset voltage value and a preset first threshold and a second threshold, wherein the second threshold is smaller than the first threshold; In response to the deviation ratio between the new voltage average value and the preset voltage value being less than or equal to the second threshold, the current pulse control cycle is ended, the next cycle is entered, and the output current is controlled again according to the preset pulse waveform; In response to the deviation ratio between the voltage average value and the preset voltage value being greater than the second threshold and less than or equal to the first threshold, the current average value of the current control cycle and the deviation ratio between the current average value and the preset current value are calculated, and the output current of the preset pulse waveform is adjusted according to the deviation ratio between the current average value and the preset current value.

3. The current control method for pulse arc welding according to claim 2, characterized in that: The step of adjusting the output current of the preset pulse waveform according to the deviation ratio between the current average value and the preset current value comprises: Determine the relationship between the deviation ratio of the current average value and the preset current value and a preset third threshold value; In response to the deviation ratio between the current average value and the preset current value being less than or equal to a preset third threshold value, controlling the pulse waveform to output a base current; In response to the deviation ratio between the current average value and the preset current value being greater than a preset third threshold value, the pulse waveform is controlled to output a preset arc-maintaining minimum current.

4. The current control method for pulse arc welding according to claim 1, characterized in that: The preset pulse waveform also includes: a second base current, and the base current < the second base current < the peak current; The control pulse waveform outputs a plurality of gradually decreasing transition currents, and the output current of the pulse waveform is gradually reduced to the base current before the end of the current pulse control cycle, including: In response to the base current being less than the output current of the pulse waveform at the current moment being less than the second base current, the pulse waveform is controlled to output a gradually decreasing transition currents to adjust the output current of the pulse waveform at the current moment down to the base current; In response to the second base current being ≤ the output current of the pulse waveform at the current moment being < the peak current, the pulse waveform is controlled to first output b gradually decreasing transition currents to adjust the output current of the pulse waveform at the current moment down to the second base current, and then the pulse waveform is controlled to output c gradually decreasing transition currents to adjust the second base current down to the base current; In response to the output current of the pulse waveform at the current moment being equal to the peak current, the pulse waveform is controlled to first output d gradually decreasing transition currents to adjust the output current of the pulse waveform from the peak current to the second base current, and then the pulse waveform is controlled to output c gradually decreasing transition currents to adjust the output current from the second base current to the base current; Among them, a<b+c<d+c.

5. The current control method for pulse arc welding according to claim 4, characterized in that: The output current of the pulse waveform at the current moment affects the setting of the third threshold value. The larger the output current of the pulse waveform at the current moment, the larger the third threshold value.

6. The current control method for pulse arc welding according to claim 5, characterized in that: The first threshold is 1.05; the second threshold is 0.95; and the minimum arc-maintaining current is 25A.

7. A current control device for pulse arc welding, characterized in that: include: A calculation module, used to calculate the voltage average value of the current pulse control cycle at each moment and the deviation ratio between the voltage average value and the preset voltage value; A judgment module, used to judge the relationship between the deviation ratio of the voltage average value to the preset voltage value and the preset first threshold value, and whether the output current of the pulse waveform at the current moment is equal to the base current; An adjustment module, used for adjusting the output current of a preset pulse waveform; A control module is used to control the output current of the pulse waveform.

8. The current control device for pulse arc welding according to claim 7, characterized in that: The calculation module is also used to calculate the current average value of the current control cycle and the deviation ratio between the current average value and the preset current value; The judgment module is also used to judge the relationship between the deviation ratio of the new voltage average value to the preset voltage value and the preset first threshold and second threshold, and the relationship between the deviation ratio of the current average value to the preset current value and the preset third threshold.

9. A computer device, characterized in that: include: Processor and memory; The processor runs a program corresponding to the executable program code by reading the executable program code stored in the memory, so as to implement the current control method for pulse arc welding as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the current control method for pulse arc welding according to any one of claims 1 to 7 is implemented.

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