Short-circuit gas metal arc welding current waveform control method and system, medium and product

Abstract

The invention discloses a short-circuit gas metal arc welding current waveform control method and system, a medium and a product, and belongs to the technical field of welding. The method comprises the steps that a current signal and a voltage signal in a welding loop are obtained in real time; calculating a loop inductance value according to the current signal and the voltage signal; the loop inductance value is compared with a first preset threshold value and a second preset threshold value, an inductance compensation strategy is dynamically generated, and preset welding current waveform parameters are adjusted according to the inductance compensation strategy; and the welding power source outputs a welding current waveform matched with the adjusted welding current waveform parameter, and the arc stability is improved by controlling molten drop stable transition. According to the method, the problems that in the welding process in the prior art, parameter matching is difficult, dynamic compensation is insufficient, and the technology applicability is poor are solved, and the molten drop transition consistency and the electric arc stability in the welding process are improved.

Description

Technical Field

[0001] The present invention relates to a short - circuit metal inert gas (MIG) / metal active gas (MAG) welding current waveform control method, system, medium and product, belonging to the field of welding technology. Background Art

[0002] Short - circuit metal inert gas (MIG) / metal active gas (MAG) welding, as a mainstream welding technology in industrial production, its core principle is based on the short - circuit phenomenon between the end of the welding wire and the workpiece caused by the welding current. Through the current thermal effect, the welding wire and the workpiece are melted to form a molten pool. This technology is widely used in fields such as automobile manufacturing, shipbuilding, and steel structure engineering. During the short - circuit MIG / MAG welding process, the loop inductance, as a key electrical parameter, is determined jointly by the transformer, reactor, connecting cables, and other components inside the welding power source. Due to factors such as the structural differences of the welding platform, the change of cable length, and the diversity of welding torch types in actual production, the loop inductance shows dynamic fluctuation characteristics. This fluctuation directly affects the rising rate and waveform characteristics of the welding current, and further affects the uniformity of droplet transfer, the stability of arc combustion, and the amount of spatter generated, ultimately having a significant impact on the quality of the welded joint.

[0003] The current short - circuit MIG / MAG welding control technology mainly relies on two modes: preset parameters or pre - welding self - inspection. The former deals with all working conditions by fixing the welding current waveform parameters, and the latter adjusts the parameters once by measuring the loop inductance. However, these traditional methods have three technical bottlenecks: First, the parameter matching complexity is extremely high. The combination of different welding platforms, cable configurations, and welding torch models results in a wide range of loop inductance changes, up to 30% - 50%. It is necessary to conduct independent parameter debugging for each working condition, which not only consumes a large amount of manpower and material resources, but also is difficult to ensure the welding quality consistency under multi - variable coupling conditions. Second, the lack of dynamic compensation ability. The existing technology can only achieve static parameter correction before welding and cannot respond in real time to the sudden change of loop inductance caused by factors such as mechanical vibration and electromagnetic interference during the welding process, resulting in a droplet transfer frequency fluctuation exceeding ±15% and an arc voltage deviation of 2 - 3V, causing an increase in the defective rate of weld formation. Third, the process adaptability is severely limited. For welding power source platforms with different inverter frequencies (5 - 50 kHz), due to the inability of traditional welding data packets to adapt to the change of loop inductance, the droplet transfer mode switching is delayed and the arc reignition failure rate increases, forcing welding engineers to repeat hundreds of welding tests for each new project to obtain effective parameters, which severely restricts the production efficiency and the process standardization process. Summary of the Invention

[0004] The object of the present invention is to provide a short - circuit metal inert gas (MIG) welding current waveform control method, system, medium and product, which can solve the problems of difficult parameter matching, insufficient dynamic compensation and poor process applicability existing in the existing technology during the welding process by real - time detecting the loop inductance and dynamically adjusting the welding current waveform parameters, and improve the droplet transfer consistency and arc stability during the welding process.

[0005] To solve the above - mentioned technical problems, the present invention is implemented by adopting the following technical solutions:

[0006] In the first aspect, the present invention provides a short - circuit MIG welding current waveform control method, including:

[0007] Obtain the current signal and voltage signal in the welding loop in real - time;

[0008] Calculate the loop inductance value according to the current signal and voltage signal;

[0009] Compare the loop inductance value with a first preset threshold and a second preset threshold respectively, dynamically generate an inductance compensation strategy, and adjust the preset welding current waveform parameters according to the inductance compensation strategy;

[0010] Make the welding power source output a welding current waveform matching the adjusted welding current waveform parameters.

[0011] Further, the calculation expression of the loop inductance value is expressed as:

[0012] ;

[0013] In the formula, represents the loop inductance value, with the unit of henry, represents the instantaneous voltage across the inductor, with the unit of volt, represents the current change rate, with the unit of ampere per second, represents the differential of the current, represents the differential of time.

[0014] Further, comparing the loop inductance value with a first preset threshold and a second preset threshold respectively, and dynamically generating an inductance compensation strategy includes:

[0015] When the loop inductance value is greater than the first preset threshold:

[0016] Reduce the current rising slope in the short - circuit stage and increase the inflection point current in the short - circuit stage, reduce the arc current in the arcing stage and extend the arcing time, and at the same time reduce the adjustment coefficient of the electronic reactor;

[0017] When the loop inductance value is less than or equal to the first preset threshold and greater than or equal to the second preset threshold:

[0018] Continue to maintain the current rising slope in the short - circuit stage, the inflection - point current in the short - circuit stage, the arcing current in the arcing stage, and the arcing time;

[0019] When the loop inductance value is less than the second preset threshold:

[0020] Increase the current rising slope in the short - circuit stage and decrease the inflection - point current in the short - circuit stage, increase the arcing current in the arcing stage and shorten the arcing time, and at the same time increase the electronic reactor adjustment coefficient.

[0021] Furthermore, the preset welding current waveform parameters include the current rising slope in the short - circuit stage, the inflection - point current in the short - circuit stage, the arcing current, the arcing time, and the electronic reactor adjustment coefficient.

[0022] Furthermore, the adjustment range of the preset welding current waveform parameters includes:

[0023] The adjustment range of the current rising slope in the short - circuit stage is 100 - 1000 A / ms;

[0024] The adjustment range of the inflection - point current in the short - circuit stage is 30 - 500 A;

[0025] The adjustment range of the arcing current is 30 - 500 A;

[0026] The adjustment range of the arcing time is 0 - 10 ms;

[0027] The adjustment range of the electronic reactor adjustment coefficient is 0.1 - 10.0.

[0028] In a second aspect, the present invention provides a short - circuit metal - inert - gas (MIG) welding current waveform control system, including:

[0029] A current sensor 101, connected to a signal processing module 103, for detecting the current signal in the welding loop and inputting the signal to the signal processing module 103;

[0030] A voltage sensor 102, connected to the signal processing module 103, for detecting the voltage signal in the welding loop and inputting the signal to the signal processing module 103;

[0031] A signal processing module 103, connected to a welding power source 105, for receiving the current signal and voltage signal in the welding loop, calculating the loop inductance value based on the current signal and voltage signal, and inputting it to the welding power source 105;

[0032] Connected to the welding power source 105, for receiving the loop inductance value, comparing the loop inductance value with the first preset threshold and the second preset threshold respectively, dynamically generating an inductance compensation strategy, and adjusting the preset welding current waveform parameters according to the inductance compensation strategy, and inputting it to the welding power source 105;

[0033] The welding power source 105, connected to the welding torch 106, is used to transmit the loop inductance value to the controller 104 and receive the adjusted welding current waveform parameters input by the controller 104, and output a welding current waveform matching the adjusted welding current waveform parameters according to the adjusted welding current waveform parameters, and input it into the welding torch 106;

[0034] The welding torch 106 is used to receive the welding current waveform and transfer the welding current waveform to the welded workpiece.

[0035] In a third aspect, the present invention provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements the short-circuit metal inert gas welding current waveform control method as described in the first aspect.

[0036] In a fourth aspect, the present invention provides a computer device, including:

[0037] A memory for storing instructions;

[0038] A processor for executing the instructions, so that the device performs an operation of implementing the short-circuit metal inert gas welding current waveform control method as described in the first aspect.

[0039] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0040] 1. By acquiring the current and voltage signals of the welding loop in real time and calculating the loop inductance value, and combining the dynamic threshold comparison mechanism to generate an inductance compensation strategy, the present invention can accurately identify the instantaneous change of the loop inductance and adaptively adjust the welding current waveform parameters. This closed-loop feedback control mode breaks through the limitation of the traditional method that only relies on static measurement before welding, and can compensate for the dynamic fluctuations of inductance caused by mechanical vibration, electromagnetic interference or working condition switching in real time during the welding process, so that the welding current waveform output by the welding power source is highly matched with the droplet transfer frequency and arc shape, improving the droplet transfer consistency and arc stability during the welding process, realizing the real-time control of the welding process, improving the welding quality and efficiency, and can also automatically adjust the welding current waveform parameters according to different loop inductance values, with strong adaptability, effectively solving the problems of difficult parameter matching, insufficient dynamic compensation and poor process applicability existing in the prior art during the welding process.

[0041] 2. By setting a first preset threshold and a second preset threshold, the present invention divides the loop inductance value into three dynamic response intervals and generates an inductance compensation strategy accordingly: when the loop inductance value is greater than the first preset threshold, feedforward control is adopted to reduce the arcing current and extend the arcing time, while slowing down the rising slope of the short-circuit current, effectively suppressing the accumulation and splashing of arc energy caused by excessive inductance; when the loop inductance value is less than or equal to the first preset threshold and greater than or equal to the second preset threshold, the rising slope of the current in the short-circuit stage, the inflection point current in the short-circuit stage, the arcing current in the arcing stage, the arcing time, and the adjustment coefficient of the electronic reactor are maintained; when the loop inductance value is less than the second preset threshold, the rising slope of the current in the short-circuit stage and the arcing current in the arcing stage are increased, and the arcing time is shortened, making the welding current waveform smoother, the droplet transfer more smooth, the arc more stable, improving the reliability of welding, and being particularly suitable for complex working conditions with multiple workstations and variable loads. Description of the Drawings

[0042] Figure 1 is a schematic flowchart of a short-circuit metal inert gas welding current waveform control method provided by an embodiment of the present invention;

[0043] Figure 2 is a schematic structural diagram of a short-circuit metal inert gas welding current waveform control system provided by an embodiment of the present invention

[0044] Figure 3 is a schematic diagram of the inductance compensation strategy provided by an embodiment of the present invention.

[0045] Reference numerals: 101 - current sensor; 102 - voltage sensor; 103 - signal processing module; 104 - controller; 105 - welding power source; 106 - welding torch. Detailed Embodiments

[0046] The technical solution of the present invention will be described in detail below with reference to the drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solution of the present invention, rather than limitations on the technical solution of the present invention. Without conflict, the technical features in the embodiments of the present invention and the embodiments can be combined with each other.

[0047] Embodiment 1

[0048] As Figure 1 shown, this embodiment introduces a short-circuit metal inert gas welding current waveform control method, including:

[0049] Step 1: Obtain the current signal and voltage signal in the welding loop in real time.

[0050] In the present invention, the current and voltage signals of the welding circuit are collected in real time through a current sensor and a voltage sensor, providing the original data support for inductance calculation. The current signal reflects the energy input intensity during the welding process, while the voltage signal reflects the arc dynamics and load characteristics. Synchronous acquisition of the two can ensure the timing consistency of the signals, avoiding calculation errors caused by signal lag. This step is the basis for the system to achieve closed-loop control. Its high-frequency sampling can capture transient changes during the welding process, such as short-circuit transfer and arc re-ignition, providing a reliable basis for the accurate calculation of the inductance value. Among them, the high-frequency sampling is usually ≥10 kHz.

[0051] Step 2: Calculate the loop inductance value according to the current signal and the voltage signal.

[0052] Based on the collected current and voltage signals, the present invention obtains the loop inductance value through the loop inductance value calculation formula. The core principle of this step is to utilize the characteristic of inductance to impede the change of current, and to reverse-calculate the inductance value through the ratio of voltage to the rate of change of current. Real-time calculation of the inductance value can dynamically reflect the inductance fluctuations in the welding circuit caused by factors such as cable length, torch position, and workpiece contact, providing a quantitative basis for the generation of subsequent compensation strategies. The accuracy of this step directly affects the response ability of the system to the dynamic changes during the welding process.

[0053] Step 3: Compare the loop inductance value with the first preset threshold and the second preset threshold respectively, dynamically generate an inductance compensation strategy, and adjust the preset welding current waveform parameters according to the inductance compensation strategy.

[0054] By setting the first preset threshold and the second preset threshold, the present invention divides the inductance fluctuations into three control intervals, corresponding to different compensation strategies respectively. When the inductance value exceeds the threshold range, it is determined that the current welding conditions deviate from the stable interval, and it is necessary to adjust the welding current waveform parameters, such as the current rising slope and the arcing time, to suppress the influence of inductance fluctuations on the welding quality.

[0055] Step 4: Make the welding power source output a welding current waveform that matches the adjusted welding current waveform parameters.

[0056] The present invention generates a corresponding welding current waveform through the welding power source according to the adjusted welding current waveform parameters, such as the current rising slope in the short-circuit stage, the inflection point current in the short-circuit stage, the arcing current, and the arcing time, ensuring that the output energy is accurately matched with the current welding conditions. For example, the welding current waveform is corrected in real time through PID closed-loop feedback, so that the deviation between the actual output and the set value is controlled within the preset deviation range, and finally a high-quality welding effect with uniform weld formation and low spatter rate is achieved.

[0057] Embodiment 2

[0058] Based on the same inventive concept as in Embodiment 1, this embodiment introduces the implementation steps of a short-circuit metal inert gas (MIG) welding current waveform control method, including:

[0059] Step 1: Obtain the current signal and voltage signal in the welding circuit in real time.

[0060] Step 2: Calculate the loop inductance value according to the current signal and voltage signal.

[0061] In this embodiment, the calculation expression of the loop inductance value is expressed as:

[0062] ;

[0063] In the formula, represents the loop inductance value, with the unit of henry, represents the instantaneous voltage across the inductor, with the unit of volt, represents the current change rate, with the unit of ampere per second, represents the differential of the current, represents the differential of time.

[0064] Step 3: Compare the loop inductance value with the first preset threshold and the second preset threshold respectively, dynamically generate an inductance compensation strategy, and adjust the preset welding current waveform parameters according to the inductance compensation strategy.

[0065] In this embodiment, the preset welding current waveform parameters include welding current, welding voltage, current rising slope in the short-circuit stage, inflection point current in the short-circuit stage, arc current, and arc time.

[0066] In this embodiment, comparing the loop inductance value with the first preset threshold and the second preset threshold respectively, dynamically generating an inductance compensation strategy, as Figure 3 shown, includes:

[0067] When the loop inductance value is greater than the first preset threshold: reduce the current rising slope in the short-circuit stage and increase the inflection point current in the short-circuit stage, reduce the arc current in the arc stage and extend the arc time, and at the same time reduce the electronic reactor adjustment coefficient. Specifically:

[0068] Adjust the first current rising slope in the short-circuit stage to: ;

[0069] Adjust the second current rising slope in the short-circuit stage to: ;

[0070] Adjust the inflection point current in the short-circuit stage to: ;

[0071] Adjust the arcing current during the arcing stage to: ;

[0072] Adjust the arcing time during the arcing stage to: ;

[0073] Adjust the electronic reactor adjustment coefficient to: ;

[0074] In the formula, represents the first current rising slope during the short - circuit stage after adjustment, with the unit of ampere per millisecond; represents the second current rising slope during the short - circuit stage after adjustment, with the unit of ampere per millisecond; represents the inflection - point current during the short - circuit stage after adjustment, with the unit of ampere; represents the arcing current during the arcing stage after adjustment, with the unit of ampere; represents the arcing time during the arcing stage after adjustment, with the unit of millisecond; represents the loop inductance value calculated in real - time; represents the loop inductance value when it is less than or equal to the first preset threshold and greater than or equal to the second preset threshold; represents the electronic reactor adjustment coefficient; , , , , and respectively represent the adjustment coefficients when the loop inductance value is greater than the first preset threshold , , , , and .

[0075] In this embodiment, when the loop inductance value is greater than the first preset threshold, the first current rising slope and the second current rising slope during the short - circuit stage are controlled by feed - forward to avoid droplet explosion and splash; increase the inflection - point current during the short - circuit stage to ensure sufficient droplet transfer; reduce the arcing current during the arcing stage and extend the arcing time , and at the same time reduce the electronic reactor adjustment coefficient to maintain arc stability and reduce the difficulty of reignition.

[0076] When the loop inductance value is less than or equal to the first preset threshold and greater than or equal to the second preset threshold, that is, when the loop inductance value is in the standard state: continue to maintain the current rising slope in the short - circuit stage, the inflection - point current in the short - circuit stage, the arcing current in the arcing stage, and the arcing time, that is, the preset welding current waveform parameter values of the system.

[0077] When the loop inductance value is less than the second preset threshold: increase the current rising slope in the short - circuit stage and decrease the inflection - point current in the short - circuit stage, increase the arcing current in the arcing stage and shorten the arcing time, and at the same time increase the electronic reactor adjustment coefficient specifically as follows:

[0078] Adjust the first current rising slope in the short - circuit stage to: ;

[0079] Adjust the second current rising slope in the short - circuit stage to: ;

[0080] Adjust the inflection - point current in the short - circuit stage to: ;

[0081] Adjust the arcing current in the arcing stage to: ;

[0082] Adjust the arcing time in the arcing stage to: ;

[0083] Adjust the electronic reactor adjustment coefficient to: ;

[0084] In the formula, , , , , and respectively represent the adjustment coefficients of , , , , and when the loop inductance value is less than the second preset threshold.

[0085] In this embodiment, the adjustment range of the preset welding current waveform parameters includes:

[0086] The adjustment range of the current rising slope in the short - circuit stage is 100 - 1000 A / ms;

[0087] The adjustment range of the inflection - point current in the short - circuit stage is 30 - 500 A;

[0088] The adjustment range of the arcing current is 30 - 500 A;

[0089] The adjustment range of the arcing time is 0 - 10 ms;

[0090] The adjustment range of the electronic reactor adjustment coefficient is 0.1 - 10.0.

[0091] In this embodiment, when the loop inductance value is less than the second preset threshold, the first current rising slope and the second current rising slope in the short - circuit stage are increased to accelerate the droplet transfer and shorten the short - circuit period; the arcing current in the arcing stage is increased and the arcing time in the arcing stage is shortened while increasing the electronic reactor adjustment coefficient to avoid overheating of the molten pool and improve the welding efficiency.

[0092] Step 4: Make the welding power source output a welding current waveform that matches the adjusted welding current waveform parameters.

[0093] This embodiment simultaneously uses closed - loop feedback to repeat Steps 1 - 3 for dynamic adjustment, real - time correction of the welding current waveform, to cope with instantaneous changes, and achieve real - time control of the welding process.

[0094] In this embodiment, the closed - loop feedback includes PID closed - loop feedback.

[0095] Embodiment 3

[0096] Based on the same inventive concept as other embodiments, this embodiment introduces a short - circuit metal inert gas (MIG) welding current waveform control system for implementing the steps of the above - mentioned Embodiment 1 or 2 method.

[0097] As Figure 2 shown, the short - circuit MIG welding current waveform control system includes a current sensor 101, a voltage sensor 102, a signal processing module 103, a controller 104, a welding power source 105, and a welding torch 106.

[0098] The current sensor 101 is connected to the signal processing module 103 and is used to detect the current signal in the welding loop and input the signal to the signal processing module 103;

[0099] The voltage sensor 102 is connected to the signal processing module 103 and is used to detect the voltage signal in the welding loop and input the signal to the signal processing module 103;

[0100] The signal processing module 103 is connected to the welding power source 105 and is configured to receive the current signal and voltage signal in the welding circuit, calculate the loop inductance value based on the current signal and voltage signal, and input it to the welding power source 105;

[0101] Connected to the welding power source 105, it is configured to receive the loop inductance value, compare the loop inductance value with a first preset threshold and a second preset threshold respectively, dynamically generate an inductance compensation strategy, and adjust the preset welding current waveform parameters according to the inductance compensation strategy, and input it to the welding power source 105;

[0102] The welding power source 105 is connected to the welding torch 106, and is configured to transmit the loop inductance value to the controller 104 and receive the adjusted welding current waveform parameters input by the controller 104, and output a welding current waveform matching the adjusted welding current waveform parameters according to the adjusted welding current waveform parameters, and input it to the welding torch 106;

[0103] The welding torch 106 is configured to receive the welding current waveform and transfer the welding current waveform to the welding workpiece.

[0104] Embodiment 4

[0105] Based on the same inventive concept as other embodiments, this embodiment introduces a computer-readable storage medium, on which computer instructions are stored, and when the computer instructions are executed by a processor, the steps of the method in the above-mentioned Embodiment 1 or 2 are implemented.

[0106] Embodiment 5

[0107] Based on the same inventive concept as other embodiments, this embodiment introduces a computer program product, including computer instructions, and when the computer instructions are executed by a processor, the steps of the method in the above-mentioned Embodiment 1 or 2 are implemented.

[0108] In summary of the above embodiments, the present invention can accurately identify the instantaneous change of the loop inductance and adaptively adjust the welding current waveform parameters by obtaining the current and voltage signals of the welding circuit in real time, calculating the loop inductance value, and generating an inductance compensation strategy in combination with a dynamic threshold comparison mechanism. This closed-loop feedback control mode breaks through the limitation of the traditional method that only relies on static measurement before welding, and can compensate for the dynamic fluctuations of inductance caused by mechanical vibration, electromagnetic interference or working condition switching in real time during the welding process, making the welding current waveform output by the welding power source highly match the droplet transfer frequency and arc shape, improving the droplet transfer consistency and arc stability during the welding process, realizing real-time control of the welding process, improving the welding quality and efficiency, and can also automatically adjust the welding current waveform parameters according to different loop inductance values, with strong adaptability, effectively solving the problems of difficult parameter matching, insufficient dynamic compensation and poor process applicability existing in the prior art during the welding process.

[0109] By setting a first preset threshold and a second preset threshold, the present invention divides the loop inductance value into three dynamic response intervals and generates an inductance compensation strategy accordingly: when the loop inductance value is greater than the first preset threshold, feedforward control is adopted to reduce the arcing current and extend the arcing time, while slowing down the rising slope of the short-circuit current, effectively suppressing the accumulation and splashing of arc energy caused by excessive inductance; when the loop inductance value is less than or equal to the first preset threshold and greater than or equal to the second preset threshold, the rising slope of the current in the short-circuit stage, the inflection-point current in the short-circuit stage, the arcing current in the arcing stage, the arcing time, and the adjustment coefficient of the electronic reactor are continued to be maintained; when the loop inductance value is less than the second preset threshold, the rising slope of the current in the short-circuit stage and the arcing current in the arcing stage are increased, and the arcing time is shortened, and the welding current waveform is corrected in real time by combining PID closed-loop feedback, making the welding current waveform smoother, the droplet transfer more smooth, the arc more stable, and improving the reliability of welding, especially suitable for complex working conditions with multiple workstations and variable loads.

[0110] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. 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. Moreover, the present invention can take the form of a computer program product implemented 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.

[0111] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present invention. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams, can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate means for realizing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0112] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including instruction means, and the instruction means realizes the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0113] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus, so that a series of operation steps are executed on the computer or other programmable apparatus to produce a computer-implemented process, thereby the instructions executed on the computer or other programmable apparatus provide steps for implementing the functions specified in one process or a plurality of processes and / or blocks Figure 1 one process or a plurality of processes and / or blocks Figure 1 steps of the functions specified in one block or a plurality of blocks.

[0114] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative rather than restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the spirit of the present invention and the scope protected by the claims. All of these fall within the protection scope of the present invention.

Claims

1. A short - circuiting MIG welding current waveform control method, characterized in that, Including: Obtaining current signal and voltage signal in the welding circuit in real time; Calculating the loop inductance value according to the current signal and voltage signal; Comparing the loop inductance value with a first preset threshold and a second preset threshold respectively, dynamically generating an inductance compensation strategy, and adjusting the preset welding current waveform parameters according to the inductance compensation strategy; Making the welding power source output a welding current waveform matching the adjusted welding current waveform parameters.

2. The short-circuiting MIG welding current waveform control method according to claim 1, characterized in that The calculation expression of the loop inductance value is expressed as: ； In the formula, represents the loop inductance value, with the unit of henry, represents the instantaneous voltage across the inductor, with the unit of volt, represents the rate of change of current, with the unit of ampere per second, represents the differential of current, represents the differential of time.

3. The short-circuiting MIG welding current waveform control method according to claim 1, characterized in that, Comparing the loop inductance value with a first preset threshold and a second preset threshold respectively, and dynamically generating an inductance compensation strategy, including: When the loop inductance value is greater than the first preset threshold: Reducing the current rising slope in the short-circuit stage and increasing the inflection point current in the short-circuit stage, reducing the arc current in the arcing stage and prolonging the arcing time, and at the same time reducing the electron reactor adjustment coefficient; When the loop inductance value is less than or equal to the first preset threshold and greater than or equal to the second preset threshold: Continuing to maintain the current rising slope in the short-circuit stage, the inflection point current in the short-circuit stage, the arc current in the arcing stage, the arcing time, and the electron reactor adjustment coefficient; When the loop inductance value is less than the second preset threshold: Increasing the current rising slope in the short-circuit stage and reducing the inflection point current in the short-circuit stage, increasing the arc current in the arcing stage and shortening the arcing time, and at the same time increasing the electron reactor adjustment coefficient.

4. The short-circuiting MIG welding current waveform control method according to claim 1, characterized in that, The preset welding current waveform parameters include the current rising slope in the short-circuit stage, the inflection point current in the short-circuit stage, the arc current, the arcing time, and the electron reactor adjustment coefficient.

5. The short-circuiting MIG welding current waveform control method according to claim 4, characterized in that, The adjustment range of the preset welding current waveform parameters includes: The adjustment range of the current rising slope in the short-circuit stage is 100~1000A / ms; The adjustment range of the inflection point current in the short-circuit stage is 30~500A; The adjustment range of the arc current is 30~500A; The adjustment range of the arcing time is 0~10ms; The adjustment range of the electron reactor adjustment coefficient is 0.1~10.

0.

6. A short-circuiting MIG welding current waveform control system, characterized in that, Including: A current sensor (101), connected to the signal processing module (103), for detecting the current signal in the welding circuit and inputting the signal into the signal processing module (103); A voltage sensor (102), connected to the signal processing module (103), for detecting the voltage signal in the welding circuit and inputting the signal into the signal processing module (103); A signal processing module (103), connected to the welding power source (105), for receiving the current signal and voltage signal in the welding circuit, calculating the loop inductance value according to the current signal and voltage signal, and inputting it into the welding power source (105); A controller (104), connected to the welding power source (105), for receiving the loop inductance value, comparing the loop inductance value with a first preset threshold and a second preset threshold respectively, dynamically generating an inductance compensation strategy, and adjusting the preset welding current waveform parameters according to the inductance compensation strategy, and inputting it into the welding power source (105); A welding power source (105), connected to a welding torch (106), is configured to transmit the loop inductance value to a controller (104) and receive the adjusted welding current waveform parameters input by the controller (104), and output a welding current waveform matching the adjusted welding current waveform parameters according to the adjusted welding current waveform parameters, and input the welding current waveform into the welding torch (106). The welding torch (106) is configured to receive the welding current waveform and transfer the welding current waveform to the welded workpiece.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the short-circuit metal inert gas welding current waveform control method according to any one of claims 1-5.

8. A computer device, characterized in that, Comprising: A memory for storing instructions; A processor for executing the instructions, such that the device performs operations implementing the short-circuit metal inert gas welding current waveform control method according to any one of claims 1-5.

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