Consumable electrode gas shield welding short circuit control method and device

Abstract

The invention discloses a gas metal arc welding short-circuit control method and device, and the method comprises the steps: presetting a short-circuit welding standard waveform, and the short-circuit welding comprises a short-circuit stage and an arcing stage; estimating according to the first period and the third period to obtain a second period; determining the duration of a second arcing stage according to the second period, and calculating the average current of the arcing stage according to the duration of the second arcing stage; calculating an arcing stage duration change according to the second arcing stage duration and the first arcing stage duration; wherein the first arcing stage duration is the arcing stage duration in the short circuit welding standard waveform; and obtaining an average deviation value of the arcing stage according to the duration change of the arcing stage and the average current of the arcing stage, and adjusting the arcing output current according to the average deviation value of the arcing stage. Through the method, the current average value is equal to the preset current, and it is guaranteed that the molten drops are uniform in size and fall off smoothly, and the current is relatively stable.

Description

Technical Field

[0001] This invention relates to the field of gas shielded welding technology, and in particular to a method and apparatus for controlling short circuits in gas shielded welding. Background Technology

[0002] Gas metal arc welding (GMAW) is a welding method that uses an electric arc generated between the welding wire and the workpiece as a heat source to melt metal. During the welding process, the molten pool formed by the arc melting the welding wire and the base metal, as well as the welding area, are protected by inert or reactive gases, effectively preventing the harmful effects of the surrounding air. Short-circuit welding is a key droplet transfer method in GMAW. It mainly uses a smaller welding current and a lower arc voltage, causing the molten droplet at the end of the welding wire to contact the molten pool of the workpiece before it completely detaches, thus forming a short circuit and achieving metal transfer.

[0003] The short-circuit welding process is divided into a short-circuit stage and an arc-burning stage. In the arc-burning stage, the high heat generated by the current and voltage melts the welding wire and forms a liquid molten ball. Under the action of electromagnetic force and gravity, the molten ball comes into contact with the base material to form a short circuit and enters the short-circuit stage. After the molten ball detaches from the tip of the welding wire, it re-enters the arc-burning stage.

[0004] In metal arc welding (MAW) with short circuit, constant voltage control is generally used, ensuring that the average voltage of each arc control cycle is equal to the preset voltage. Since the arc length is voltage-dependent, constant voltage control guarantees arc length consistency, resulting in a better welding experience. However, in actual welding, large current fluctuations or other objective arc vibrations can lead to inconsistent droplet sizes, resulting in an uneven fusion line on the weld. This is particularly noticeable in the 220A~280A current range.

[0005] Therefore, there is an urgent need for a short-circuit waveform control method that can avoid problems such as large current fluctuations that lead to inconsistent droplet sizes. Summary of the Invention

[0006] This invention provides a method and apparatus for controlling short circuits in gas metal arc welding, which achieves the average current being equal to the preset current, ensuring uniform droplet size, smooth droplet detachment, and relatively stable current.

[0007] Firstly, this invention provides a short-circuit control method for gas metal arc welding (GMAW). This method is executed by a computing device, which can be understood as a computer or similar device; however, this invention does not limit the scope of the computing device. The method includes:

[0008] A preset short-circuit welding standard waveform is used, which includes a short-circuit phase and an arcing phase. A second cycle is estimated based on the first and third cycles. The first cycle is the period of the short-circuit welding standard waveform, the second cycle is the current short-circuit welding cycle, and the third cycle is the previous cycle. The duration of the second arcing phase is determined based on the second cycle, and the average current of the arcing phase is calculated based on this duration. The duration of the second arcing phase is the arcing phase duration of the current short-circuit welding cycle. The change in arcing phase duration is calculated based on the duration of the second and first arcing phases. The duration of the first arcing phase is the arcing phase duration in the short-circuit welding standard waveform. The average deviation value of the arcing phase is obtained based on the change in arcing phase duration and the average current of the arcing phase. The arcing output current is adjusted based on this average deviation value.

[0009] The above method first presets a standard waveform for short-circuit welding, defining the short-circuit and arcing phases within it to obtain a short-circuit welding waveform that ensures basic voltage stability. Then, based on the standard waveform and the previous / current cycle, a second cycle is obtained to adjust the arcing phase waveform, ensuring the output current deviates minimally from the preset current. The second cycle is adjusted using the first and third cycles to avoid overly drastic adjustments. Next, the average current of the arcing phase is calculated based on its duration to detect the average current of the current cycle's arcing phase. The arcing phase duration variation is calculated based on the durations of the second and first arcing phases to quantify waveform changes caused by variations in the total duration of the previous cycle and the short-circuit duration of the current cycle. The average deviation value of the arcing phase is obtained based on the arcing phase duration variation and the average current, providing the average deviation value between the current cycle waveform and the standard waveform. This deviation serves as the basis for adjusting the current waveform to more closely approximate the standard waveform. Finally, the arcing output current is adjusted based on the average arcing phase deviation value to obtain a waveform closer to the standard waveform. This method not only ensures basic voltage stability, but also achieves the goal of equalizing the average current value with the preset current and minimizing the overall period T variation by adjusting the current waveform shape during the arcing stage. This ensures uniform droplet size, smooth droplet detachment, and relatively stable current.

[0010] In the aforementioned gas metal arc welding short-circuit control method, the duration of the second arc stage is determined according to the second cycle, and the average current of the arc stage is calculated based on the duration of the second arc stage, including: subtracting the duration of the second short-circuit stage from the second cycle to obtain the duration of the second arc stage; wherein, the duration of the second short-circuit stage is the duration of the short-circuit stage in the current cycle; and the average current of the arc stage is calculated based on the second cycle, the duration of the second arc stage, the preset current, and the cumulative current of the short-circuit stage.

[0011] In this invention, the duration of the second arcing stage is obtained by subtracting the duration of the second short-circuit stage from the duration of the second cycle. Since the short-circuit welding process of gas metal arc welding includes both a short-circuit stage and an arcing stage, the duration of the arcing stage can be obtained given the current short-circuit welding cycle and the duration of the short-circuit stage. The average current of the arcing stage is calculated based on the second cycle, the duration of the second arcing stage, and the preset current, ensuring that the obtained average current value of the arcing stage more closely matches the actual effect.

[0012] In the aforementioned gas metal arc welding short-circuit control method, the average current during the arcing stage is calculated based on the second cycle, the duration of the second arcing stage, the preset current, and the cumulative current during the short-circuit stage, including:

[0013] ;

[0014] in, This represents the average current during the arcing phase, and T represents the second period. This indicates the duration of the second arc-burning phase.

[0015] By using the above method, the average current of the arcing stage is calculated based on the second cycle, the duration of the second arcing stage, and the preset current, ensuring that the obtained average current value of the arcing stage is more in line with the actual effect.

[0016] The aforementioned short-circuit control method for gas metal arc welding further includes: calculating the length of the molten welding wire in the second cycle according to the second cycle; obtaining the cumulative power of the arc-burning stage based on the length of the molten welding wire and the energy of the molten welding wire; wherein the energy of the molten welding wire is preset through experiments; and calculating the constant voltage of the arc-burning stage based on the cumulative power of the arc-burning stage and the average current of the arc-burning stage.

[0017] Through the above method, this invention calculates the length of the molten welding wire in the second cycle and obtains the cumulative power of the arc-burning stage based on the length and energy of the molten welding wire. Ideally, when the cycle is stable, the length of the molten welding wire melted in each cycle is fixed at the wire feed speed multiplied by the cycle. Since the cumulative power of the arc-burning stage is related to the length of the molten welding wire, the cumulative power of the arc-burning stage can be obtained by calculating the length and energy of the molten welding wire. The cumulative power of the arc-burning stage is used to determine the constant voltage of the arc-burning stage. Setting the arc-burning stage voltage to a fixed value concentrates the energy in the arc-burning stage, which helps the welding wire melt quickly. Constant voltage control ensures that the average voltage of each arc control cycle is equal to the preset voltage. Since the arc length is related to the voltage, constant voltage control ensures consistent arc length and a better welding experience.

[0018] In the aforementioned gas metal arc welding short-circuit control method, the second cycle is estimated based on the first and third cycles, including:

[0019] ;

[0020] in, Indicates the second cycle. Indicates the first cycle. This indicates the third cycle.

[0021] Using the above method, a second cycle is obtained based on the first and third cycles. This second cycle is used to adjust the waveform during the arcing phase, ensuring that the output current does not deviate significantly from the preset current. Setting the adjustment value to one-third ensures that the cycle adjustment is gradual, avoiding overly drastic adjustments that could lead to poor results.

[0022] In the aforementioned short-circuit control method for gas metal arc welding, the average deviation value of the arc stage is obtained based on the variation of the arc stage duration and the average current during the arc stage, including:

[0023] ;

[0024] in, This represents the average deviation during the arcing phase. This represents the average current during the arcing phase. This represents the average current during the arcing phase of the standard waveform in short-circuit welding. This indicates the duration of the arc phase in the standard waveform for short-circuit welding. Indicates the current at the end of the arcing phase. This indicates the variation in the duration of the arcing phase. This indicates the arcing stage current starting from the arcing stage current. decay to The time.

[0025] In the above manner, the present invention calculates the average deviation value during the arcing stage, which serves as the basis for adjusting the current waveform to be closer to the standard waveform. This optimizes the adjustment result of the arcing output current of the present invention, making it more consistent with the standard waveform.

[0026] In the aforementioned gas metal arc welding short-circuit control method, the arc output current is adjusted based on the average deviation value during the arc combustion stage, including:

[0027] ;

[0028] in, Indicates the arc output current. Indicates the starting current of the arcing stage. Indicates the current at the end of the arcing phase. The attenuation coefficient is represented by t, and the arcing time is represented by t. Indicates the current during the arcing stage from decay to Time, This represents the average deviation during the arcing phase.

[0029] By means of the above method, this invention adjusts the arc output current based on the average deviation during the arcing stage to obtain a waveform closer to the standard waveform. This method not only ensures basic voltage stability but also achieves the goal of making the adjusted average current equal to the preset current and minimizing the overall period T variation by adjusting the current waveform shape during the arcing stage. This, in turn, ensures uniform droplet size, smooth droplet detachment, and relatively stable current.

[0030] Secondly, the present invention provides a gas metal arc welding (GMAW) short-circuit control device for executing the GMAW short-circuit control method of the present invention, comprising: a waveform preset module, a period acquisition module, a current calculation module, a duration calculation module, and a current adjustment module, wherein...

[0031] The system includes the following modules: a waveform preset module for presetting a standard waveform for short-circuit welding, which includes a short-circuit phase and an arcing phase; a cycle acquisition module for estimating a second cycle based on a first cycle and a third cycle, where the first cycle is the cycle of the standard short-circuit welding waveform, the second cycle is the current short-circuit welding cycle, and the third cycle is the previous cycle; a current calculation module for determining the duration of the second arcing phase based on the second cycle and calculating the average current of the arcing phase based on the duration of the second arcing phase, where the duration of the second arcing phase is the arcing phase duration of the current short-circuit welding cycle; a duration calculation module for calculating the change in the duration of the arcing phase based on the duration of the second and first arcing phases, where the duration of the first arcing phase is the arcing phase duration in the standard short-circuit welding waveform; and a current adjustment module for obtaining the average deviation value of the arcing phase based on the change in the arcing phase duration and the average current of the arcing phase, and adjusting the arcing output current based on the average deviation value of the arcing phase.

[0032] Thirdly, the present invention also provides a computing device, comprising: a memory for storing program instructions; and a processor for calling the program instructions stored in the memory and executing the method described in the first aspect according to the obtained program instructions.

[0033] Fourthly, the present invention also provides a computer-readable storage medium storing computer-readable instructions, which, when read and executed by a computer, implement the method of the first aspect described above.

[0034] Fifthly, the present invention provides a computer program product comprising a computer program executable by a computer device, wherein when the program is run on the computer device, the computer device performs the method described in the first aspect.

[0035] Beneficial Effects: The above method first presets a standard waveform for short-circuit welding, defining the short-circuit and arcing phases within it to obtain a short-circuit welding waveform that ensures basic voltage stability. Then, based on the standard waveform and the previous / current cycle, a second cycle is obtained to adjust the arcing phase waveform, ensuring the output current deviates little from the preset current. The second cycle is adjusted using the first and third cycles to avoid overly drastic cycle adjustments. Furthermore, the average current of the arcing phase is calculated based on its duration to detect the average current of the current cycle's arcing phase. The arcing phase duration variation is calculated based on the durations of the second and first arcing phases to quantify waveform changes caused by variations in the total duration of the previous cycle and the short-circuit duration of the current cycle. The average deviation value of the arcing phase is obtained based on the arcing phase duration variation and the average current, providing the average deviation value between the current cycle waveform and the standard waveform. This deviation serves as the basis for adjusting the current waveform to more closely approximate the standard waveform. Finally, the arcing output current is adjusted based on the average arcing phase deviation value to obtain a waveform closer to the standard waveform. This method not only ensures basic voltage stability, but also achieves the goal of equalizing the average current value with the preset current and minimizing the overall period T variation by adjusting the current waveform shape during the arcing stage. This ensures uniform droplet size, smooth droplet detachment, and relatively stable current. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 A schematic flowchart of a short-circuit control method for gas metal arc welding provided by the present invention;

[0038] Figure 2 A standard waveform diagram of a short-circuit control method for gas metal arc welding provided by the present invention;

[0039] Figure 3 A waveform diagram illustrating a short-circuit control method for gas metal arc welding provided by the present invention;

[0040] Figure 4 A schematic diagram of a short-circuit control device for gas metal arc welding provided by the present invention;

[0041] Figure 5 This is a schematic diagram of the structure of a computing device provided in an embodiment of the present invention. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0043] In the following embodiments of the present invention, "and / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one (item) below" or similar expressions refer to any combination of these items, including any combination of single (item) or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, a - b, a - c, b - c, or a - b - c, where a, b, and c can be single or multiple. The singular forms of expression such as "one", "a kind of", "", "the above", "the", and "this" are also intended to include expressions such as "one or more" unless there is a clear indication to the contrary in the context. Also, unless otherwise stated, the ordinal numbers such as "first", "second", etc. mentioned in the embodiments of the present invention are used to distinguish multiple objects and are not used to limit the order, time sequence, priority, or importance of multiple objects.

[0044] Describing reference to "an embodiment" or "some embodiments" etc. in the specification of the present invention means that in one or more embodiments of the present invention, specific features, structures, or characteristics described in conjunction with that embodiment are included. Thus, statements such as "in an embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments" etc. that appear at different places in this specification do not necessarily all refer to the same embodiment, but mean "one or more but not all embodiments" unless otherwise specifically emphasized in another way. The terms "comprise", "include", "have" and their variants all mean "including but not limited to" unless otherwise specifically emphasized in another way.

[0045] Embodiment 1

[0046] Embodiment 1 of the present invention provides a short - circuit control method for gas - shielded metal arc welding. This method is executed by a computing device, which can be understood as a device such as a computer, and the present invention does not limit this here. Through this method, the short - circuit welding process of gas - shielded metal arc welding is controlled to ensure that the droplet size is uniform, the droplets fall off smoothly, and the current is relatively stable. The steps of this method are as follows Figure 1 As shown, it includes:

[0047] Step 101, preset a standard waveform for short - circuit welding.

[0048] The standard waveform for short-circuit welding includes a short-circuit stage and an arc-ignition stage. During the short-circuit stage, the welding wire is continuously fed until the molten droplet contacts the weld pool, forming a metal bridge. The arc then extinguishes, the voltage drops sharply, and the current begins to rise. During the arc-ignition stage, a certain distance is maintained between the welding wire and the workpiece. The arc burns stably, and the high temperature generated by the arc rapidly melts the tip of the welding wire, forming a molten droplet that continues to heat the workpiece, forming a weld pool. The standard waveform for short-circuit welding is as follows: Figure 2 As shown, the period of the standard waveform for short-circuit welding is expressed as... The duration of the short-circuit phase is expressed as duration of the arc burning phase The average current over the entire cycle is the preset current. The duration of the short-circuit phase is not fixed per cycle because it requires waiting for the necking determination. The current waveform during the arcing phase shows an exponential decrease in the first half, gradually stabilizing into a straight line in the second half. The starting current of the arcing phase is expressed as... The final current of the arcing stage is expressed as The number of current exponential decays during the arcing stage is: This indicates that the current during the arcing stage originates from... decay to The time.

[0049] The formula for calculating the standard output current during the arcing stage is shown below.

[0050]

[0051] in, This is the starting current for the arcing stage. Let d be the terminal current of the arcing phase, d be the attenuation coefficient, and t be the arcing time. This represents the number of exponential decays of the current during the arcing phase. When I decays to... At that time, maintain This method concentrates energy during the arc-burning phase, which helps the welding wire melt quickly.

[0052] According to the standard waveform, the average current during the arcing stage is... Since the voltage during the arcing phase is set to a fixed value, under ideal conditions, the cycle is stable, and the length of the welding wire melted in each cycle is fixed at the wire feed speed per cycle. The length of the welding wire melted under a standard waveform cycle is expressed as:

[0053]

[0054] in, This indicates the length of the welding wire that melts during the standard waveform period. Indicates the wire feeding speed. This indicates the period of the standard waveform; the welding wire melting mainly occurs during the arc-ignition stage.

[0055] By using the above method, a standard waveform for short-circuit welding is preset. Since the total duration of each cycle and the duration of the short-circuit phase are not fixed during short-circuit welding, it is necessary to adjust the waveform of the arc-ignition phase and the arc-ignition phase waveform to ensure that the output current deviates little from the preset current. .

[0056] Step 102: Obtain the second cycle based on the predictions of the first and third cycles.

[0057] The first cycle is the cycle of the standard short-circuit welding waveform, the second cycle is the current short-circuit welding cycle, and the third cycle is the cycle preceding the current cycle. The method for estimating the second cycle based on the first and third cycles is as follows.

[0058] ;

[0059] in, Indicates the second cycle. Indicates the first cycle. This indicates the third cycle. This indicates the adjustment range. Taking one-third is to ensure that the periodic adjustment is not too drastic, which would cause the output current to change too much. However, in actual operation, other values ​​can be selected according to the actual situation. This invention does not limit the adjustment range.

[0060] Step 103: Determine the duration of the second arcing stage based on the second cycle, and calculate the average current of the arcing stage based on the duration of the second arcing stage.

[0061] The duration of the second arc-ignition phase is the arc-ignition phase duration of the current short-circuit welding cycle. After obtaining the necking determination time of the current cycle, the short-circuit phase duration of the current cycle can be obtained, i.e., the second short-circuit phase duration. The second arc-ignition phase duration is obtained by subtracting the second short-circuit phase duration from the second cycle duration. The second short-circuit phase duration is the duration of the short-circuit phase of the current cycle. The method for obtaining the second arc-ignition phase duration is as follows:

[0062] ;

[0063] Where T represents the second period, Indicates the duration of the second short-circuit phase. This indicates the duration of the second arc-burning phase. This method determines the duration of the arc-burning phase in the current cycle, ensuring more accurate subsequent numerical calculations for other arc-burning phase values.

[0064] Meanwhile, the average current during the arcing phase is calculated based on the second cycle, the duration of the second arcing phase, the preset current, and the cumulative current during the short-circuit phase. The calculation method is shown below.

[0065] ;

[0066] in, This represents the average current during the arcing phase, and T represents the second period. This indicates the duration of the second arcing phase. The average current during the arcing phase is calculated using this method to detect the average current during the arcing phase of the current cycle.

[0067] Step 104: Calculate the change in arc phase duration based on the duration of the second arc phase and the duration of the first arc phase.

[0068] The duration of the first arc-ignition phase is the arc-ignition phase duration in the standard short-circuit welding waveform. The change in arc-ignition phase duration is the difference between the arc-ignition phase duration of the current cycle and the arc-ignition phase duration of the standard waveform. The change in arc-ignition phase duration is calculated based on the durations of the second and first arc-ignition phases to quantify the waveform changes caused by the changes in the total duration of the previous cycle and the changes in the short-circuit duration of the current cycle. The expression of the arc-ignition phase duration change is as follows:

[0069] ;

[0070] in, This represents the change in the duration of the arcing phase. Indicates the duration of the second arc-burning phase. This indicates the duration of the first arc-burning phase.

[0071] Step 105: Obtain the average deviation value of the arcing stage based on the change in the duration of the arcing stage and the average current of the arcing stage, and adjust the arcing output current based on the average deviation value of the arcing stage.

[0072] The average deviation during the arcing phase is calculated based on the changes in arcing phase duration, average current during the arcing phase, average current during the arcing phase of the standard waveform, arcing phase duration of the standard waveform, current value at the end of the arcing phase, and changes in arcing phase duration, and is expressed as follows:

[0073] ;

[0074] in, This represents the average deviation during the arcing phase. This represents the average current during the arcing phase. This represents the average current during the arcing phase of the standard waveform in short-circuit welding. This indicates the duration of the arc phase in the standard waveform for short-circuit welding. Indicates the current at the end of the arcing phase. This indicates the variation in the duration of the arcing phase. This indicates the arcing stage current starting from the arcing stage current. decay to The time.

[0075] After obtaining the average deviation value during the arcing stage, the arcing output current is adjusted based on this value. This adjustment is made using the standard output current formula for the arcing stage, expressed as follows:

[0076] ;

[0077] in, Indicates the arc output current. Indicates the starting current of the arcing stage. Indicates the current at the end of the arcing phase. The attenuation coefficient is represented by t, and the arcing time is represented by t. Indicates the current during the arcing stage from decay to Time, This represents the average deviation during the arcing phase.

[0078] By incorporating the average deviation value of the arcing stage into the standard current formula for the arcing stage output, the obtained current result better meets the requirements of the current cycle while approaching the standard current result, ensuring that the waveform of the current cycle better conforms to the preset standard waveform, until the short circuit stage is entered again. For example... Figure 3 The diagram shows a comparison between the waveform of the current cycle after adjusting the current according to the present invention and the standard waveform. It can be seen that the overall trend of the waveform after adjusting the current is consistent with the standard waveform, and the result is closer to the result of the standard waveform. Therefore, the present invention can achieve the average value of the adjusted current equal to the preset current and the overall cycle T changes less by adjusting the waveform shape of the current during the arcing stage, while basically ensuring voltage stability. This ensures uniform droplet size, smooth droplet detachment, and relatively stable current.

[0079] Example 2

[0080] Based on the short-circuit control method for gas metal arc welding provided in Example 1, Embodiment 2 of the present invention provides a method for calculating the constant voltage during the arcing stage. This method ensures that the voltage remains basically stable. The execution steps of this method include:

[0081] Step 201: Calculate the length of the molten welding wire in the second cycle based on the second cycle.

[0082] Under ideal conditions, the cycle is stable, and the length of the welding wire melted in each cycle is fixed at the wire feed speed multiplied by the cycle. The length of the welding wire melted under a standard waveform cycle is expressed as:

[0083]

[0084] in, This indicates the length of the welding wire that melts during the standard waveform period. Indicates the wire feeding speed. This indicates the period of the standard waveform; the welding wire melting mainly occurs during the arc-ignition stage.

[0085] Therefore, it can be concluded that the length L of the molten welding wire in the current second cycle is obtained based on the wire feed speed and the current cycle, and can be expressed as follows:

[0086]

[0087] in, Indicates the wire feeding speed. This indicates the second cycle.

[0088] Step 202: Obtain the cumulative power during the arc burning stage based on the length and energy of the molten welding wire; wherein, the energy of the molten welding wire is preset through experiments.

[0089] Since the melting of the welding wire mainly occurs during the arc-ignition stage, the cumulative power during the arc-ignition stage can be obtained based on the length and energy of the molten welding wire. The calculation method for the cumulative power during the arc-ignition stage is as follows.

[0090]

[0091] Where L represents the length of the welding wire melted in the second cycle, and q represents the energy of melting a unit length of welding wire. The specific value of the energy q of melting a unit length of welding wire can be obtained through experimental calculation, and this invention does not limit it.

[0092] Step 203: Calculate the constant voltage of the arcing stage based on the cumulative power and average current of the arcing stage.

[0093] Since the average current during the arcing stage has been obtained, it is expressed as follows:

[0094] ;

[0095] in, This represents the average current during the arcing phase, and T represents the second period. This indicates the duration of the second arcing phase. The average current during the arcing phase is calculated using this method to detect the average current during the arcing phase of the current cycle.

[0096] Therefore, based on the cumulative power and average current during the arcing stage, the constant voltage during the arcing stage can be calculated. The constant voltage during the arcing stage is expressed as follows.

[0097] ;

[0098] in, This indicates the constant voltage during the arcing stage. P represents the average current during the arcing stage, and P represents the cumulative power during the arcing stage.

[0099] Example 3

[0100] Based on Example 1, Embodiment 3 of the present invention introduces a short-circuit control device for gas metal arc welding, which is as follows: Figure 4 As shown, it includes: waveform preset module, period acquisition module, current calculation module, duration calculation module and current adjustment module.

[0101] Among them, the waveform preset module is used to preset the standard waveform for short-circuit welding, which includes the short-circuit stage and the arc-burning stage.

[0102] The cycle acquisition module is used to estimate the second cycle based on the first cycle and the third cycle; wherein, the first cycle is the cycle of the short-circuit welding standard waveform, the second cycle is the current cycle of short-circuit welding, and the third cycle is the previous cycle of the current cycle.

[0103] The current calculation module is used to determine the duration of the second arcing stage based on the second cycle, and to calculate the average current of the arcing stage based on the duration of the second arcing stage; the duration of the second arcing stage is the duration of the arcing stage in the current cycle of short-circuit welding;

[0104] The duration calculation module is used to calculate the change in arc stage duration based on the duration of the second arc stage and the duration of the first arc stage; wherein, the duration of the first arc stage is the duration of the arc stage in the standard waveform of short-circuit welding;

[0105] The current adjustment module is used to obtain the average deviation value of the arcing stage based on the changes in the duration of the arcing stage and the average current of the arcing stage, and to adjust the arcing output current based on the average deviation value of the arcing stage.

[0106] Example 4

[0107] After introducing the short-circuit control method for gas metal arc welding in an exemplary embodiment of the present invention, the following describes a computing device in another exemplary embodiment of the present invention.

[0108] Those skilled in the art will understand that various aspects of the present invention can be implemented as systems, methods, or program products. Therefore, various aspects of the present invention can be specifically implemented in the following forms: entirely in hardware, entirely in software (including firmware, microcode, etc.), or in a combination of hardware and software, collectively referred to herein as “circuit,” “module,” or “system.”

[0109] In some possible implementations, the computing device according to the invention may include at least one processor and at least one memory. The memory stores a computer program that, when executed by the processor, causes the processor to perform the steps described above in the various exemplary embodiments of the invention.

[0110] The following reference Figure 5 To describe a computing device 130 according to this embodiment of the invention. Figure 5 The computing device 130 shown is merely an example and should not be construed as limiting the functionality and scope of the embodiments of the present invention. Figure 5 As shown, the computing device 130 is presented in the form of a general-purpose smart terminal (or Bluetooth headset). The components of the computing device 130 may include, but are not limited to: at least one processor 131, at least one memory 132, and a bus 133 connecting different system components (including memory 132 and processor 131).

[0111] Bus 133 represents one or more of several bus architectures, including a memory bus or memory controller, peripheral bus, processor, or local bus using any of the various bus architectures. Memory 132 may include readable media in the form of volatile memory, such as random access memory (RAM) 1321 and / or cache memory 1322, and may further include read-only memory (ROM) 1323. Memory 132 may also include a program / utility 1325 having a set (at least one) of program modules 1324, including but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of these examples may include an implementation of a network environment.

[0112] The computing device 130 can also communicate with one or more external devices 134 (e.g., keyboard, pointing device, etc.), and / or with any device that enables the computing device 130 to communicate with one or more other smart terminals (e.g., router, modem, etc.). This communication can be performed via input / output (I / O) interface 135. Furthermore, the computing device 130 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) via network adapter 136. As shown, network adapter 136 communicates with other modules used in the computing device 130 via bus 133. It should be understood that, although not shown in the figures, other hardware and / or software modules can be used in conjunction with the computing device 130, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0113] In some possible implementations, various aspects of the gas metal arc welding short-circuit control method provided by the present invention can also be implemented in the form of a program product, which includes a computer program that, when run on a computer device, causes the computer device to perform the steps of the methods described above in various exemplary embodiments of the present invention.

[0114] The program product may employ any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0115] The program product of embodiments of the present invention may employ a portable compact disc read-only memory (CD-ROM) and include a computer program, and may run on a smart terminal. However, the program product of the present invention is not limited thereto. In this document, the readable storage medium may be any tangible medium containing or storing a program that may be used by or in conjunction with an instruction execution system, apparatus, or device.

[0116] A readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, carrying a readable computer program. Such propagated data signals may take various forms, including—but not limited to—electromagnetic signals, optical signals, or any suitable combination thereof. A readable signal medium may also be any readable medium other than a readable storage medium, capable of sending, propagating, or transmitting a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0117] It should be noted that although several units or sub-units of the device have been mentioned in the detailed description above, this division is merely exemplary and not mandatory. In fact, according to embodiments of the present invention, the features and functions of two or more units described above can be embodied in one unit. Conversely, the features and functions of one unit described above can be further divided and embodied by multiple units.

[0118] Furthermore, although the operations of the method of the present invention are described in a specific order in the accompanying drawings, this does not require or imply that these operations must be performed in that specific order, or that all the operations shown must be performed to achieve the desired result. Additionally or alternatively, certain steps may be omitted, multiple steps may be combined into one step, and / or one step may be broken down into multiple steps.

[0119] 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 access frequency prediction device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable access frequency prediction device, 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.

[0120] These computer program instructions may also be stored in a computer-readable storage medium capable of directing a computer or other programmable access predictive device to operate 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.

[0121] These computer program instructions can also be loaded onto a computer or other programmable access predictive device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable device for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0122] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the invention.

[0123] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for controlling short circuits in gas metal arc welding, characterized in that, include: A standard waveform for preset short-circuit welding is provided, wherein the short-circuit welding includes a short-circuit stage and an arc-ignition stage. The second cycle is estimated based on the first cycle and the third cycle; wherein, the first cycle is the cycle of the short-circuit welding standard waveform, the second cycle is the current cycle of short-circuit welding, and the third cycle is the previous cycle of the current cycle; The duration of the second arcing phase is determined based on the second cycle, and the average current of the arcing phase is calculated based on the duration of the second arcing phase; the duration of the second arcing phase is the duration of the arcing phase in the current cycle of short-circuit welding; The arc phase duration variation is calculated based on the second arc phase duration and the first arc phase duration; wherein, the first arc phase duration is the arc phase duration in the short-circuit welding standard waveform; The average deviation value of the arcing stage is obtained based on the change in the duration of the arcing stage and the average current of the arcing stage. The arcing output current is then adjusted based on the average deviation value of the arcing stage.

2. The method according to claim 1, characterized in that, The step of determining the duration of the second arcing stage based on the second period and calculating the average current of the arcing stage based on the duration of the second arcing stage includes: The second arcing phase duration is obtained by subtracting the second short-circuit phase duration from the second cycle; wherein, the second short-circuit phase duration is the duration of the short-circuit phase in the current cycle. The average current of the arcing stage is calculated based on the second cycle, the duration of the second arcing stage, the preset current, and the cumulative current of the short-circuit stage.

3. The method according to claim 2, characterized in that, The step of calculating the average current during the arcing stage based on the second cycle, the duration of the second arcing stage, the preset current, and the cumulative current during the short-circuit stage includes: ； Among them, the The term represents the average current during the arcing phase, where T represents the second period. This indicates the duration of the second arc-burning phase.

4. The method according to claim 1, characterized in that, The method further includes: Calculate the length of the molten welding wire in the second cycle based on the second cycle; The cumulative power during the arcing stage is obtained based on the length and energy of the molten welding wire; wherein, the energy of the molten welding wire is preset through experiments; The constant voltage of the arcing stage is calculated based on the cumulative power and the average current of the arcing stage.

5. The method according to claim 1, characterized in that, The process of estimating the second period based on the first and third periods includes: ； Among them, the Indicating the second period, the Indicating the first cycle, the This indicates the third cycle.

6. The method according to claim 1, characterized in that, The step of obtaining the average deviation value of the arcing stage based on the change in the duration of the arcing stage and the average current of the arcing stage includes: ； Among them, the This represents the average deviation during the arcing phase. The average current during the arcing phase is represented by the following. The average current during the arcing phase of the standard waveform in short-circuit welding is represented by the following: The duration of the arc phase in the standard waveform for short-circuit welding is indicated by the following: Indicates the current at the end of the arcing stage, the This indicates the variation in the duration of the arcing phase. This indicates the arcing stage current starting from the arcing stage current. decay to The time.

7. The method according to claim 1, characterized in that, The adjustment of the arc output current based on the average deviation during the arcing stage includes: ； Among them, the Indicates the arc output current, the Indicates the starting current of the arcing stage, the Indicates the current at the end of the arcing stage, the The attenuation coefficient is represented by t, which represents the arcing time. Indicates the current during the arcing stage from decay to The time, the This represents the average deviation during the arcing phase.

8. A short-circuit control device for gas metal arc welding, characterized in that, include: A waveform preset module is used to preset a standard waveform for short-circuit welding, wherein the short-circuit welding includes a short-circuit stage and an arc-burning stage. The cycle acquisition module is used to estimate and obtain the second cycle based on the first cycle and the third cycle; wherein, the first cycle is the cycle of the short-circuit welding standard waveform, the second cycle is the current cycle of short-circuit welding, and the third cycle is the previous cycle of the current cycle; The current calculation module is used to determine the duration of the second arcing stage based on the second cycle, and to calculate the average current of the arcing stage based on the duration of the second arcing stage; the duration of the second arcing stage is the duration of the arcing stage in the current cycle of short-circuit welding; The duration calculation module is used to calculate the change in arc stage duration based on the duration of the second arc stage and the duration of the first arc stage; wherein, the duration of the first arc stage is the duration of the arc stage in the standard waveform of short-circuit welding; The current adjustment module is used to obtain the average deviation value of the arcing stage based on the change in the duration of the arcing stage and the average current of the arcing stage, and to adjust the arcing output current based on the average deviation value of the arcing stage.

9. A computing device, characterized in that, Its features include: Memory, used to store program instructions; A processor is configured to invoke program instructions stored in the memory and execute the method as described in any one of claims 1-7 according to the obtained program instructions.

10. A computer-readable storage medium, characterized in that, Includes computer-readable instructions that, when read and executed by a computer, cause the method as described in any one of claims 1 to 7 to be implemented.

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