Arc length control method and apparatus

Abstract

An arc length control method comprises: obtaining a peak average voltage; obtaining a base average voltage; determining an arc length feedback value ALV of a current pulse period of an arc according to the peak average voltage and the base average voltage; and adjusting a pulse parameter of a next pulse period according to the arc length feedback value ALV and a deviation of a set voltage value; wherein the arc length feedback value is expressed as: ALV=A*IPV+B*IBV+C, wherein IPV represents the peak average voltage of the current pulse period, IBV represents the base average voltage of the current pulse period, A represents an adjustment coefficient of a pulse peak voltage, B represents an adjustment coefficient of a base pulse voltage, and C represents a voltage compensation amount. An arc length control device, a non-volatile storage medium, and a computer program product are also provided.

Description

TECHNICAL FIELD

[0001] Embodiments of the present disclosure relate to the field of welding, in particular, to an arc length control method and device. BACKGROUND

[0002] It is an inevitable choice to accelerate the promotion of lightweight level in the fields of automobile, rail transportation, aerospace and other major transportation fields to cope with challenges. There is no doubt that as the best partner material for lightweight, aluminum alloy material will lead to a new era.

[0003] The most commonly used welding process for aluminum alloy is pulse welding. Pulse welding can achieve stable welding from 30A to 400A current domain, and the plate thickness can cover 0.8mm to 15mm. Moreover, through the adjustment of arc length, splash-free welding can be achieved.

[0004] However, due to the particularity of aluminum welding materials, the arc control for aluminum alloy welding faces many problems. One of the difficulties is how to determine the arc length, and whether the arc length is stable will directly affect the welding quality. SUMMARY

[0005] To this end, at least one embodiment of the present disclosure provides a method and device for controlling welding arc to control the arc length of the welding arc in a different way and achieve the purpose of stable welding.

[0006] At least one embodiment of the present disclosure provides an arc length control method, comprising:

[0007] obtaining a peak average voltage;

[0008] obtaining a base average voltage;

[0009] determining an arc length feedback value ALV of a current pulse period of the arc according to the peak average voltage and the base average voltage; and

[0010] adjusting the pulse parameters of a next pulse period according to the deviation between the arc length feedback value ALV and a set voltage value;

[0011] wherein the arc length feedback value is represented as: ALV=A*IPV+B*IBV+C, wherein IPV represents the peak average voltage of the current pulse period, IBV represents the base average voltage of the current pulse period, A represents an adjustment coefficient of the pulse peak voltage, B represents an adjustment coefficient of the base pulse voltage, and C represents a voltage compensation amount.

[0012] In one embodiment of the present disclosure, obtaining a peak average voltage comprises:

[0013] reading a plurality of peak sampling voltages in a first time length during the output of the peak voltage;

[0014] filtering each of the plurality of peak sampling voltages to determine a plurality of filtered peak voltages; and

[0015] averaging the plurality of peak voltages to obtain a peak average voltage.

[0016] In an embodiment of the present disclosure, the first time length is 30us-60us.

[0017] In an embodiment of the present disclosure, filtering each of the plurality of peak sampling voltages to determine a plurality of filtered peak voltages comprises:

[0018] determining an absolute value of a peak voltage deviation between each of the peak sampling voltages and a peak standard voltage;

[0019] determining whether the absolute value of the peak voltage deviation is greater than a first voltage threshold; and,

[0020] in a case where the absolute value of the peak voltage deviation is greater than the first voltage threshold, taking the peak standard voltage as the peak voltage, and in a case where the absolute value of the peak voltage deviation is less than or equal to the first voltage threshold, taking the peak sampling voltage as the peak voltage;

[0021] wherein the peak standard voltage represents a peak voltage corresponding to the set voltage value under ideal welding conditions.

[0022] In an embodiment of the present disclosure, obtaining the base average voltage comprises:

[0023] reading a plurality of base sampling voltages in a second time length during output of the base voltage;

[0024] filtering each of the plurality of base sampling voltages to determine a plurality of filtered base voltages; and

[0025] averaging the plurality of base voltages to obtain a base average voltage.

[0026] In an embodiment of the present disclosure, the second time length is 200us-1000us.

[0027] In an embodiment of the present disclosure, filtering each of the plurality of base sampling voltages to determine a plurality of filtered base voltages comprises:

[0028] determining an absolute value of a base voltage deviation between each of the base sampling voltages and a base standard voltage;

[0029] determining whether the absolute value of the base voltage deviation is greater than a second voltage threshold; and,

[0030] in a case where the absolute value of the base voltage deviation is greater than the voltage threshold value, taking the base standard voltage as the base voltage, and in a case where the absolute value of the base voltage deviation is less than or equal to the second voltage threshold value, taking the base sampling voltage as the base voltage;

[0031] wherein the base standard voltage represents a base voltage corresponding to the set voltage value under ideal welding conditions.

[0032] In one embodiment of the present disclosure, the pulse parameters include a peak current, a base current and a pulse period, and adjusting the pulse parameters of the next pulse period according to the deviation between the arc length feedback value ALV and the set voltage value SetV includes:

[0033] performing PID control on a peak current standard value according to the deviation between the arc length feedback value ALV and the set voltage value SetV to determine the peak current of the next period;

[0034] performing PID control on a base current standard value according to the deviation between the arc length feedback value ALV and the set voltage value SetV to determine the base current of the next period; and

[0035] performing PID control on a pulse period standard value according to the deviation between the arc length feedback value ALV and the set voltage value SetV to determine the pulse period of the next period;

[0036] wherein the peak current standard value represents a peak current corresponding to the set voltage value under ideal welding conditions, the base current standard value represents a base current corresponding to the set voltage value under ideal welding conditions, and the pulse period standard value represents a pulse period corresponding to the set voltage value under ideal welding conditions.

[0037] At least one embodiment of the present disclosure provides an arc length control device, comprising:

[0038] a peak average voltage acquisition unit configured to acquire a peak average voltage;

[0039] a base average voltage acquisition unit configured to acquire a base average voltage;

[0040] an arc length feedback value determination unit configured to determine an arc length feedback value ALV of a current pulse period of an electric arc according to the peak average voltage and the base average voltage; and

[0041] a pulse parameter adjustment unit configured to adjust parameters of a next pulse period according to the deviation between the arc length feedback value ALV and a set voltage value;

[0042] The arc length feedback value is expressed as ALV=A*IPV+B*IBV+C, where IPV represents the peak average voltage of the current pulse period, IBV represents the base average voltage of the current pulse period, A represents an adjustment coefficient of the peak pulse voltage, B represents an adjustment coefficient of the peak pulse voltage, and C represents a voltage compensation amount.

[0043] In one embodiment of the present disclosure, the peak average voltage acquisition unit comprises:

[0044] A peak voltage sampling subunit configured to read a plurality of peak sampling voltages during output of the peak voltage;

[0045] A peak voltage filtering subunit configured to perform filtering processing on each of the plurality of peak sampling voltages respectively, and determine a plurality of filtered peak voltages; and

[0046] A peak average voltage determination subunit configured to average the plurality of peak voltages, and determine the peak average voltage.

[0047] In one embodiment of the present disclosure, the peak voltage filtering subunit comprises:

[0048] A peak voltage deviation absolute value determination unit configured to determine an absolute value of a peak voltage deviation between each peak sampling voltage and a peak standard voltage;

[0049] A first judgment unit configured to determine whether the absolute value of the peak voltage deviation is greater than a first voltage threshold; and

[0050] A peak voltage determination unit configured to, in a case where the absolute value of the peak voltage deviation is greater than the first voltage threshold, take the peak standard voltage as the peak voltage, and in a case where the absolute value of the peak voltage deviation is less than or equal to the first voltage threshold, take the peak sampling voltage as the peak voltage.

[0051] In one embodiment of the present disclosure, the base average voltage acquisition unit comprises:

[0052] A base voltage sampling subunit configured to read a plurality of base sampling voltages during output of the base voltage;

[0053] A base voltage filtering subunit configured to perform filtering processing on each of the plurality of base sampling voltages respectively, and determine a plurality of filtered base voltages; and

[0054] A base average voltage determination subunit configured to average the plurality of base voltages, and determine the base average voltage.

[0055] In one embodiment of the present disclosure, the base voltage filtering subunit comprises:

[0056] a base value voltage deviation absolute value determination unit configured to determine an absolute value of a base value voltage deviation between each base value sampling voltage and a base value standard voltage;

[0057] a second determination unit configured to determine whether the absolute value of the base value voltage deviation is greater than a second voltage threshold; and

[0058] a base value voltage determination unit configured to, in a case where the absolute value of the base value voltage deviation is greater than the second voltage threshold, take the base value standard voltage as a base value voltage, and in a case where the absolute value of the base value voltage deviation is less than or equal to the second voltage threshold, take the base value sampling voltage as the base value voltage.

[0059] In one embodiment of the present disclosure, the pulse parameter adjustment unit comprises:

[0060] a peak current adjustment sub-unit configured to adjust a peak current of a next pulse period according to a deviation between the arc length feedback value ALV and the set voltage value;

[0061] a base value current adjustment sub-unit configured to adjust a base value current of a next pulse period according to a deviation between the arc length feedback value ALV and the set voltage value; and

[0062] a pulse period adjustment sub-unit configured to adjust a pulse period of a next pulse period according to a deviation between the arc length feedback value ALV and the set voltage value.

[0063] At least one embodiment of the present disclosure provides a non-volatile storage medium having a processor-executable computer program stored thereon, in response to the processor executing the computer program, the processor is configured to implement the operations of any of the arc length control methods described above.

[0064] At least one embodiment of the present disclosure provides a computer program product comprising a processor-executable program computer program, when the computer program is executed by the processor, the processor is configured to implement the operations of any of the arc length control methods described above. BRIEF DESCRIPTION OF DRAWINGS

[0065] Figure 1 A flowchart of an arc length control method according to one embodiment of the present disclosure is shown;

[0066] Figure 2 A voltage and current output waveform diagram of an electric arc pulse is shown;

[0067] Figure 3 A flowchart of obtaining a peak average voltage in an arc length control method of one embodiment of the present disclosure is shown;

[0068] Figure 4 Various voltage situations in the peak voltage output process of a pulse are shown;

[0069] Figure 5 A flow chart showing filtering of the peak sampling voltage in the arc length control method of one embodiment of the present disclosure is shown;

[0070] Figure 6 A flow chart showing obtaining of the base average voltage in the arc length control method of one embodiment of the present disclosure is shown;

[0071] Figure 7 Various voltage situations in the base voltage output process of a pulse are shown;

[0072] Figure 8 A flow chart showing filtering of the base sampling voltage in the arc length control method of one embodiment of the present disclosure is shown;

[0073] Figure 9 A process diagram showing adjustment of the peak current of the next pulse period according to the deviation between the arc length feedback value ALV and the set voltage value SetV is shown;

[0074] Figure 10 A process diagram showing adjustment of the base current of the next pulse period according to the deviation between the arc length feedback value ALV and the set voltage value SetV is shown;

[0075] Figure 11 A process diagram showing adjustment of the pulse period of the next pulse period according to the deviation between the arc length feedback value ALV and the set voltage value SetV is shown;

[0076] Figure 12 A block diagram of an arc length control device according to one embodiment of the present disclosure is shown;

[0077] Figure 13 A block diagram of a peak average voltage obtaining unit of an arc length control device according to one embodiment of the present disclosure is shown;

[0078] Figure 14 A block diagram of a peak voltage filtering subunit of an arc length control device according to one embodiment of the present disclosure is shown;

[0079] Figure 15 A block diagram of a base average voltage obtaining unit of an arc length control device according to one embodiment of the present disclosure is shown;

[0080] Figure 16 A block diagram of a base voltage filtering subunit of an arc length control device according to one embodiment of the present disclosure is shown; and

[0081] Figure 17 A block diagram of a pulse parameter adjustment unit of an arc length control device is shown according to one embodiment of the present disclosure. DETAILED DESCRIPTION

[0082] The present disclosure is further described in detail by the accompanying drawings and embodiments. The features and advantages of the present disclosure will become more apparent from the detailed description, accompanying drawings and claims.

[0083] The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any implementation described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations. Although various aspects of embodiments are illustrated and described herein, unless specifically stated otherwise, the drawings are not necessarily drawn to scale and to the precise specifications.

[0084] Moreover, the technical features involved in the different embodiments of the present disclosure described below can be combined with each other as long as there is no conflict.

[0085] The conventional pulse arc control is based on the average voltage AvgV of an integral period as the basis for determining the arc length. When the average voltage AvgV is higher than the set voltage value SetV, it is determined that the arc length is increased, and the pulse period T needs to be increased in the next pulse period to adjust to the appropriate arc length. Conversely, when the average voltage AvgV is lower than the set voltage value SetV, it is determined that the arc length is decreased, and the pulse period T needs to be decreased in the next pulse period to adjust to the appropriate arc length. However, it is found through a large number of welding verifications that the average voltage of a pulse period cannot fully reflect the actual arc length, especially for aluminum alloy materials. For example, under the condition of heating the base material, the average voltage of the pulse period will be low, but the actual arc length will be long. When the welding speed changes, such as from slow to fast, the average voltage of the pulse period will also decrease, but the actual arc length will be long. When the welding angle position changes, such as from flat plate butt welding to T-shaped welding, the arc length will also change significantly.

[0086] However, due to the particularity of aluminum welding materials, such as high thermal conductivity (about 3 times that of steel), easy oxidation (the melting point of the oxide film is as high as 2015℃), etc., the aluminum alloy arc control also faces many problems, one of which is the determination of the arc length in welding. Whether the arc length is stable in welding will directly affect the welding quality. The traditional pulse arc control is to take the average voltage AvgV of an integral period as the basis for determining the arc length. When the average voltage AvgV of a general pulse is higher than the set voltage value SetV, it is determined that the arc length is increased, and the pulse period T needs to be increased in the next pulse period, so as to reduce the average voltage AvgV of an integral period and adjust to the appropriate arc length. Conversely, when the average voltage AvgV of a pulse is lower than the set voltage value SetV, it is determined that the arc length is reduced, and the pulse period T needs to be reduced in the next pulse period, so as to increase the average voltage AvgV of an integral period and adjust to the appropriate arc length.

[0087] However, it is found through a large number of welding verifications that the average voltage of a pulse period cannot completely reflect the real arc length, especially for aluminum alloy materials. For example, under the condition that the base material is heated, the average voltage of a pulse period will be low, but the actual arc length will be long. This is determined by the characteristics of aluminum alloy welding. The usual control method and control rule are no longer suitable for aluminum alloy welding. When the welding speed changes, such as from slow to fast, the average voltage of a pulse period will also decrease, but the actual arc length will be long. When the position of the welding angle (the common welding forms include plate butt joint, T-type welding, direct welding, and staggered welding, and the angle between the two base materials in T-type welding, direct welding, and staggered welding is called the welding angle) changes, for example, from plate butt joint welding to T-type welding, due to the change of the welding angle, the protective gas is compressed by the external environment, resulting in the change of the arc, and the arc length will also change significantly.

[0088] To this end, embodiments of the present disclosure provide an arc length control method and an arc length control device.

[0089] At least one embodiment of the present disclosure provides an arc length control method. Figure 1 A flow chart of an arc length control method according to an embodiment of the present disclosure is shown as follows. Figure 1 As shown, the arc length control method comprises:

[0090] S01, obtaining a peak average voltage;

[0091] S02, obtaining a base average voltage;

[0092] S03, determining an arc length feedback value ALV of a current pulse period of the arc according to the peak average voltage and the base average voltage; and

[0093] S04, adjusting the pulse parameter of the next pulse period according to the deviation between the arc length feedback value ALV and the set voltage value;

[0094] wherein the arc length feedback value is expressed as: ALV=A*IPV+B*IBV+C, wherein IPV represents the peak average voltage of the current pulse period, IBV represents the base average voltage of the current pulse period, A represents the adjustment coefficient of the pulse peak voltage, B represents the adjustment coefficient of the base pulse voltage, and C represents the voltage compensation amount.

[0095] For different set current values SetA during welding, the corresponding pulse parameters are different, and each set current value corresponds to a group of parameters A, B and C. The value of parameter C is generally selected as a fixed value, for example, 0V-5V. For each set current value SetA, the corresponding parameters A, B and C can be determined in the following manner.

[0096] Each set current value SetA corresponds to a set voltage value SetV. For different set current values SetA, under ideal conditions, welding is performed according to the specified welding speed and dry extension length, and parameters A, B and C are continuously adjusted so that the arc length feedback value ALV=A*IPV+B*IBV+C is equal to the set voltage value SetV. The welding speed refers to the length of welding per unit time, and the dry extension length refers to the length of the welding wire from the conducting nozzle of the welding torch to the base material. Under ideal welding conditions, for different set current values SetA, the peak voltage and base voltage of the pulse are determined, the parameter C is selected as a fixed value, and the dry extension length is adjusted so that the arc length feedback value ALV is equal to the set voltage value SetV, thereby determining parameters A, B and C for each set current value SetA. The process of determining parameters A, B and C is performed before the arc length control method of the present disclosure is implemented.

[0097] Due to various differences between the actual welding conditions and the ideal welding conditions, the peak average voltage IPV and the base average voltage IBV of the output pulse during welding deviate from the peak standard voltage and the base standard voltage, the peak standard voltage refers to the peak voltage corresponding to the set voltage value under ideal welding conditions, and the base standard voltage refers to the base voltage corresponding to the set voltage value under ideal welding conditions. After parameters A, B and C are determined, to determine the arc length feedback value ALV of the current pulse period of the arc during welding, the peak average voltage IPV and the base average voltage IBV need to be determined. How to determine the peak average voltage IPV and the base average voltage IBV will be described and explained below.

[0098] Figure 2 The voltage and current output waveform diagram of the arc pulse is shown. As Figure 2As shown, each pulse cycle is divided into four stages: the arc ignition stage (t1-t2), the peak voltage output stage (t2-t3), the arc termination stage (t3-t4), and the base voltage output stage (t4-t5). Arc ignition begins at time t1, and the output voltage and current begin to increase. Peak voltage and current are output from time t2. Arc termination begins at time t3, and the output voltage and current begin to decrease. Base voltage and current are output from time t4 to time t5. After setting the welding current, the welding machine determines the pulse peak standard voltage and pulse base standard voltage based on ideal welding conditions.

[0099] Figure 3 A flowchart for obtaining the peak average voltage is shown in one embodiment of this disclosure.

[0100] like Figure 3 As shown, obtaining the peak average voltage includes: in S011, reading multiple peak sample voltages during the output peak voltage process; in S012, filtering each of the multiple peak sample voltages to determine the multiple peak voltages after filtering; and in S013, averaging the multiple peak voltages to obtain the peak average voltage.

[0101] During the operation of the welding machine, the output voltage is continuously sampled and recorded. Starting from time t2 of the pulse, the voltage within a fixed time length tp is used to calculate the average voltage, which is then used as the peak average voltage (IPV). The time length tp is selected based on the length between time points t2 and t3 and the pulse rise time (i.e., arc ignition time). If the time is too short, an abnormally high peak voltage or a small short-circuit voltage will indicate an abnormal arc length; if the time is too long, it will affect the real-time performance of the arc length feedback. In one embodiment of this disclosure, the time length tp is set to 30µs to 60µs. In another embodiment of this disclosure, considering that the arc is relatively stable for a period before time point t3, the peak average voltage is calculated based on the voltage within the time length tp from time point t3-tp to time point t3.

[0102] Figure 4 Various voltage scenarios are shown during the pulse peak voltage output process. Figure 4 The upper part shows the normal voltage during the pulse peak voltage output process. Figure 4 The middle section shows an abnormally high voltage condition, while Figure 4The lower part shows the case of abnormal low voltage. In the case of abnormal high voltage, the result obtained by obtaining the peak average voltage IPV based on the peak sampling voltage obtained in the sampling process will be larger, and in the case of abnormal low voltage, the result obtained by obtaining the peak average voltage IPV based on the peak sampling voltage obtained in the sampling process will be smaller. In order to prevent the influence of abnormal high voltage or abnormal low voltage on the peak average voltage IPV, the peak sampling voltage is filtered in the sampling process.

[0103] In one embodiment of the present disclosure, as shown in Figure 5 The filtering processing is performed on each of the plurality of peak sampling voltages respectively to determine a plurality of filtered peak voltages, including:

[0104] S0121, determining the absolute value of the peak voltage deviation between each peak sampling voltage and the peak standard voltage;

[0105] S0122, determining whether the absolute value of the peak voltage deviation is greater than a first voltage threshold; and,

[0106] S0123, in the case that the absolute value of the peak voltage deviation is greater than the first voltage threshold, taking the peak standard voltage as the peak voltage, and in the case that the absolute value of the peak voltage deviation is less than or equal to the first voltage threshold, taking the peak sampling voltage as the peak voltage.

[0107] The peak standard voltage of the welding is generally determined under ideal welding conditions. Generally, the peak standard voltage is different for different materials. At the same time, the peak standard voltage is also related to the wire diameter. For low carbon steel alloy, the peak standard voltage is about 28V when the wire diameter is 1.2mm, and for aluminum alloy, the peak standard voltage is about 24V when the wire diameter is 1.2mm. For other materials and wire diameters, the peak standard voltage will be different, which can be determined by actual test data.

[0108] Generally, the voltage threshold can be selected as 5V to 8V. For example, the voltage threshold can be selected as 5V, 6V, 7V or 8V, which can be selected according to the specific situation.

[0109] After obtaining a plurality of peak voltages within a fixed time length tp, the plurality of peak voltages are averaged to obtain a peak average voltage.

[0110] In one embodiment of the present disclosure, as shown in Figure 6 The obtaining of the base average voltage includes:

[0111] S021, reading a plurality of base sampling voltages during the output of the base voltage;

[0112] S022, filtering each of the plurality of base value sampling voltages respectively to determine a plurality of filtered base value voltages; and

[0113] S023, averaging the plurality of base value voltages to obtain a base value average voltage.

[0114] After the time t4 of the pulse, that is, after the base value voltage of the pulse starts to be output, the output base value voltage is sampled within a fixed time length tb to obtain a plurality of base value sampling voltages. The fixed time length tb needs to be set according to the base value voltage holding time of the pulse. In an embodiment of the present disclosure, the fixed time length tb is selected to be 200us-1000us. If the time is too short, when the base value voltage of the pulse appears an abnormally high voltage or a short circuit voltage, the arc length will be determined to be abnormal; if the time is too long, the real-time performance of the arc length feedback will be affected. In addition, in order to reduce the influence of the abnormal base value voltage on the base value average voltage, the fixed time length tb is selected to be the time length tb between the time point t5-tb and the time point t5.

[0115] Figure 7 Various voltage situations in the process of outputting the base value voltage of the pulse are shown. Figure 7 The upper part shows the normal voltage in the process of outputting the base value voltage IBV of the pulse, Figure 7 the middle part shows the case of an abnormally high voltage, and Figure 7 the lower part shows the case of an abnormally low voltage. In the case of an abnormally high voltage, the result obtained by obtaining the base value average voltage IBV based on the base value sampling voltage obtained in the sampling process will be larger, and in the case of an abnormally low voltage, the result obtained by obtaining the base value average voltage IBV based on the base value sampling voltage obtained in the sampling process will be smaller. In order to prevent the influence of the abnormally high voltage or the abnormally low voltage on the base value average voltage IBV, the base value sampling voltage is filtered in the sampling process.

[0116] In an embodiment of the present disclosure, as Figure 8 shown, filtering each of the plurality of base value sampling voltages respectively includes:

[0117] S0121, determining the absolute value of the base value voltage deviation between each base value sampling voltage and the base value standard voltage;

[0118] S0122, determining whether the absolute value of the base value voltage deviation is greater than a second voltage threshold; and,

[0119] S0123, in the case that the absolute value of the base voltage deviation is greater than the voltage threshold value, the base standard voltage is taken as the base voltage, and in the case that the absolute value of the base voltage deviation is less than or equal to the second voltage threshold value, the base sampling voltage is taken as the base voltage.

[0120] After the base sampling voltage is filtered, the plurality of base voltages are averaged to obtain a base average voltage.

[0121] The base standard voltage is generally determined under ideal welding conditions. Generally, the base standard voltage is different for different materials. At the same time, the base standard voltage is also related to the wire diameter. Generally, the base standard voltage is between 10V and 20V. The second voltage threshold value can be selected as any voltage value in 3V to 5V according to specific conditions.

[0122] After the peak average voltage and the base average voltage are obtained, the arc length feedback value of the current pulse is determined according to the arc length feedback value formula ALV=A*IPV+B*IBV+C.

[0123] After the arc length feedback value ALV of the current pulse is determined, the peak current, the base current and the period of the next pulse can be adjusted according to the difference between the arc length feedback value ALV and the set voltage value SetV, so as to achieve the purpose of stable welding.

[0124] The pulse parameters of the next pulse period include the peak current, the base current and the pulse period. In an embodiment of the present disclosure, adjusting the pulse parameters of the next pulse period according to the deviation between the arc length feedback value ALV and the set voltage value SetV includes: adjusting the peak current, the base current and the pulse period of the next pulse period according to the deviation between the arc length feedback value ALV and the set voltage value.

[0125] Figure 9 A process diagram for adjusting the peak current of the next pulse period according to the difference between the arc length feedback value ALV and the set voltage value SetV is shown. Figure 10 A process diagram for adjusting the base current of the next pulse period according to the difference between the arc length feedback value ALV and the set voltage value SetV is shown. Figure 11 A process diagram for adjusting the pulse period of the next pulse period according to the difference between the arc length feedback value ALV and the set voltage value SetV is shown.

[0126] In determining the peak current of the next pulse, as Figure 9As shown in FIG. 6, the difference between the arc length feedback value ALV and the set voltage value SetV is determined, and the difference between the arc length feedback value ALV and the set voltage value SetV is input into the peak current PID controller. The output of the peak current PID controller acts on the peak current standard value, and the peak current of the next pulse is determined.

[0127] As shown in FIG. 7, the difference between the arc length feedback value ALV and the set voltage value SetV is determined, and the difference between the arc length feedback value ALV and the set voltage value SetV is input into the base current PID controller. The output of the base current PID controller acts on the base current standard value, and the base current of the next pulse is determined. Figure 10

[0128] As shown in FIG. 8, the difference between the arc length feedback value ALV and the set voltage value SetV is determined, and the difference between the arc length feedback value ALV and the set voltage value SetV is input into the pulse period PID controller. The output of the pulse period PID controller acts on the pulse period standard value, and the pulse period of the next pulse is determined. Figure 11

[0129] The peak current standard value represents the peak current corresponding to the set voltage value under ideal welding conditions, the base current standard value represents the base current corresponding to the set voltage value under ideal welding conditions, and the pulse period standard value represents the pulse period corresponding to the set voltage value under ideal welding conditions.

[0130] By replacing the pulse average voltage with the arc length feedback value ALV, the pulse average voltage can reflect the true arc length when welding certain special materials, and the problem of arc length instability caused by changes in the molten pool, temperature, speed, etc. during aluminum welding can be solved.

[0131] At least one embodiment of the present disclosure arc length control device obtains the arc length feedback value ALV of the current pulse and controls the peak current output value, the base current output value and the pulse period output value of the next pulse based on the difference between the arc length feedback value ALV and the set voltage value SetV. The problem of arc length instability caused by changes in the molten pool, temperature, speed, etc. during aluminum welding can be solved.

[0132] In one embodiment of the present disclosure, as shown in FIG. 9, the arc length control device 100 includes: Figure 12

[0133] The peak average voltage acquisition unit 101 is configured to acquire the peak average voltage;

[0134] The base average voltage acquisition unit 102 is configured to acquire the base average voltage;

[0135] ​​​The arc length feedback value determination unit 103 is configured to determine an arc length feedback value ALV of a current pulse period of the arc according to the peak average voltage and the base average voltage.

[0136] The pulse parameter adjustment unit 104 is configured to adjust parameters of a next pulse period according to a deviation of the arc length feedback value ALV and a set voltage value.

[0137] In an embodiment of the present disclosure, the arc length feedback value is expressed as: ALV=A*IPV+B*IBV+C, where IPV represents the peak average voltage of the current pulse period, IBV represents the base average voltage of the current pulse period, A represents an adjustment coefficient of the pulse peak voltage, B represents an adjustment coefficient of the peak pulse voltage, and C represents a voltage compensation amount. The determination of the parameters A, B and C is described above.

[0138] In an embodiment of the present disclosure, as shown in Figure 13 The peak average voltage acquisition unit 101 includes:

[0139] The peak voltage sampling sub-unit 1011 is configured to read a plurality of peak sampling voltages during output of the peak voltage.

[0140] The peak voltage filtering sub-unit 1012 is configured to respectively perform filtering processing on each of the plurality of peak sampling voltages to determine a plurality of filtered peak voltages.

[0141] The peak average voltage determination sub-unit 1013 is configured to average the plurality of peak voltages to determine the peak average voltage.

[0142] In an embodiment of the present disclosure, as shown in Figure 14 The peak voltage filtering sub-unit 1012 includes: a peak voltage deviation absolute value determination unit 10121 configured to determine an absolute value of a peak voltage deviation between each peak sampling voltage and a peak standard voltage.

[0143] A first judgment unit 10122 is configured to determine whether the absolute value of the peak voltage deviation is greater than a first voltage threshold.

[0144] A peak voltage determination unit 10123 is configured to, in a case where the absolute value of the peak voltage deviation is greater than the first voltage threshold, take the peak standard voltage as the peak voltage, and in a case where the absolute value of the peak voltage deviation is less than or equal to the first voltage threshold, take the peak sampling voltage as the peak voltage.

[0145] The determination of the peak standard voltage and the first voltage threshold is described above. After the peak voltage filtering subunit determines the peak voltage, the peak voltage is sent to the peak average voltage determination subunit, the plurality of peak voltages are averaged, and the peak average voltage is determined.

[0146] In one embodiment of the present disclosure, as shown in Figure 15 The base value average voltage obtaining unit 102 includes:

[0147] The base value voltage sampling subunit 1021 is configured to read a plurality of base value sampling voltages during output of the base value voltage;

[0148] The base value voltage filtering subunit 1022 is configured to perform filtering processing on each of the plurality of base value sampling voltages respectively, and determine a plurality of filtered base value voltages; and

[0149] The base value average voltage determination subunit 1023 is configured to average the plurality of base value voltages, and determine a base value average voltage.

[0150] In one embodiment of the present disclosure, as shown in Figure 16 The base value voltage filtering subunit 1022 includes:

[0151] The deviation absolute value determination unit 10221 is configured to determine an absolute value of a base value voltage deviation between each base value sampling voltage and the base value standard voltage;

[0152] The second determination unit 10222 is configured to determine whether the absolute value of the base value voltage deviation is greater than a second voltage threshold; and

[0153] The base value voltage determination unit 10223 is configured to, in a case where the absolute value of the base value voltage deviation is greater than the second voltage threshold, take the base value standard voltage as the base value voltage, and in a case where the absolute value of the base value voltage deviation is less than or equal to the second voltage threshold, take the base value sampling voltage as the base value voltage.

[0154] The determination of the base value standard voltage and the second voltage threshold is described above. After the base value voltage filtering subunit determines the base value voltage, the base value voltage is sent to the base value average voltage determination subunit, the plurality of base value voltages are averaged, and the base value average voltage is determined.

[0155] After the peak average voltage and the base value average voltage are obtained, the arc length feedback value determination unit 103 is configured to determine a current pulse period of the electric arc according to the peak average voltage and the base value average voltage.

[0156] the arc length feedback value ALV. Then, the pulse parameter adjustment unit 104 adjusts the parameters of the next pulse period according to the arc length feedback value ALV and the deviation of the set voltage value.

[0157] The parameters of the pulse period include the peak current, the base current and the pulse period. The parameters of the next pulse period are adjusted according to the arc length feedback value ALV and the deviation of the set voltage value.

[0158] In one embodiment of the present disclosure, as shown in FIG. 1, the pulse parameter adjustment unit 104 includes: Figure 17

[0159] 0a peak current adjustment sub-unit 1041 configured to adjust the peak current of the next pulse period according to the arc length feedback value ALV and the deviation of the set voltage value;

[0160] a base current adjustment sub-unit 1042 configured to adjust the base current of the next pulse period according to the arc length feedback value ALV and the deviation of the set voltage value; and

[0161] a pulse period adjustment sub-unit 1043 configured to adjust the pulse period of the next pulse period according to the arc length feedback value ALV and the deviation of the set voltage value.

[0162] As to how to adjust the peak current, the base current and the pulse period of the next pulse period, please refer to the description of the arc length control method embodiments above, which will not be repeated here.

[0163] In the arc length control device according to the embodiments of the present disclosure, by replacing the pulse average voltage with the arc length feedback value ALV, the pulse average voltage can reflect the real arc length when welding some special materials, and can solve the problem of arc length instability caused by changes in the molten pool, temperature, speed and the like during the aluminum welding process.

[0164]

[0165] In the arc length control device according to the embodiments of the present disclosure, by replacing the pulse average voltage with the arc length feedback value ALV, the pulse average voltage can reflect the real arc length when welding some special materials, and can solve the problem of arc length instability caused by changes in the molten pool, temperature, speed and the like during the aluminum welding process.

[0166]

[0167] At least one embodiment of the present disclosure provides a non-volatile storage medium having a computer program executable by a processor stored thereon, and the processor is configured to implement the operations of any of the arc length control methods described above in response to the processor executing the computer program.

[0168] 5At least one embodiment of the present disclosure provides a computer program product, the computer program product comprising instructions configured to cause a processor to implement the operations of any of the arc length control methods described above.

[0169] ​​​The product includes a processor-executable program computer program, when the computer program is executed by a processor, the processor is configured to implement the operation of any arc length control method described above.

[0170] In the description of the present disclosure, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "back", "left", "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship in the working state of the present disclosure, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0171] In the description of the present disclosure, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense. For those skilled in the art, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances.

[0172] The present disclosure has been described above in combination with preferred embodiments, but these embodiments are only exemplary and serve only to illustrate. On this basis, various substitutions and improvements can be made to the present disclosure, which all fall within the protection scope of the present disclosure.

Claims

1. An arc length control method, comprising: Obtain the peak-to-average voltage; Obtain the base average voltage; The arc length feedback value ALV of the current pulse period of the arc is determined based on the peak average voltage and the base average voltage. as well as Based on the deviation between the arc length feedback value ALV and the set voltage value, adjust the pulse parameters for the next pulse cycle; The arc length feedback value is expressed as: ALV = A* IPV + B* IBV + C, where IPV represents the peak average voltage of the current pulse period, IBV represents the base average voltage of the current pulse period, A represents the adjustment coefficient of the pulse peak voltage, B represents the adjustment coefficient of the base pulse voltage, and C represents the voltage compensation amount. The step of obtaining the peak-to-average voltage includes: During the output peak voltage process, multiple peak sample voltages are read within a first time length; Each of the plurality of peak sampled voltages is filtered to determine the filtered plurality of peak voltages; and The multiple peak voltages are averaged to obtain the peak average voltage; Specifically, filtering is performed on each of the plurality of peak sampled voltages to determine the filtered plurality of peak voltages, including: Determine the absolute value of the peak voltage deviation between each peak sampled voltage and the peak standard voltage; Determine whether the absolute value of the peak voltage deviation is greater than a first voltage threshold; and, If the absolute value of the peak voltage deviation is greater than the first voltage threshold, the peak standard voltage is taken as the peak voltage; and if the absolute value of the peak voltage deviation is less than or equal to the first voltage threshold, the peak sampled voltage is taken as the peak voltage. Wherein, the peak standard voltage represents the peak voltage corresponding to the set voltage value under ideal welding conditions.

2. The arc length control method according to claim 1, wherein, The first time duration is 30us to 60us.

3. The arc length control method according to claim 1, wherein, Obtaining the base average voltage includes: During the output base value voltage process, multiple base value sample voltages are read within a second time length; Each of the plurality of base value sampled voltages is filtered to determine the plurality of filtered base value voltages; and The base voltages are averaged to obtain the base average voltage.

4. The arc length control method according to claim 3, wherein, The second time length is 200us to 1000us.

5. The arc length control method according to claim 3, wherein, Each of the plurality of base value sampled voltages is filtered to determine the plurality of filtered base value voltages, including: Determine the absolute value of the base value voltage deviation between each base value sampling voltage and the base value standard voltage; Determine whether the absolute value of the base voltage deviation is greater than the second voltage threshold; and, If the absolute value of the base value voltage deviation is greater than the second voltage threshold, the base value standard voltage is used as the base value voltage; and if the absolute value of the base value voltage deviation is less than or equal to the second voltage threshold, the base value sampled voltage is used as the base value voltage. Wherein, the base standard voltage represents the base voltage corresponding to the set voltage value under ideal welding conditions.

6. The arc length control method according to any one of claims 1 to 5, wherein, The pulse parameters include peak current, base current, and pulse period. Adjusting the pulse parameters for the next pulse period based on the deviation between the arc length feedback value (ALV) and the set voltage value includes: Based on the deviation between the arc length feedback value ALV and the set voltage value SetV, PID control is applied to the peak current standard value to determine the peak current for the next cycle. Based on the deviation between the arc length feedback value ALV and the set voltage value SetV, PID control is applied to the base current standard value to determine the base current for the next cycle; and Based on the deviation between the arc length feedback value ALV and the set voltage value SetV, PID control is applied to the standard value of the pulse period to determine the pulse period of the next cycle. Wherein, the peak current standard value represents the peak current corresponding to the set voltage value under ideal welding conditions, the base current standard value represents the base current corresponding to the set voltage value under ideal welding conditions, and the pulse period standard value represents the pulse period corresponding to the set voltage value under ideal welding conditions.

7. An arc length control device, comprising: Peak-to-average voltage acquisition unit, configured to acquire peak-to-average voltage; The base value average voltage acquisition unit is configured to acquire the base value average voltage. The arc length feedback value determination unit is configured to determine the arc length feedback value ALV of the current pulse period of the arc based on the peak average voltage and the base average voltage. as well as The pulse parameter adjustment unit is configured to adjust the parameters of the next pulse cycle based on the deviation between the arc length feedback value ALV and the set voltage value. The arc length feedback value is expressed as: ALV = A* IPV + B* IBV + C, where IPV represents the peak average voltage of the current pulse period, IBV represents the base average voltage of the current pulse period, A represents the adjustment coefficient of the pulse peak voltage, B represents the adjustment coefficient of the base pulse voltage, and C represents the voltage compensation amount. The peak-to-average voltage acquisition unit includes: The peak voltage sampling subunit is configured to read multiple peak sample voltages during the output peak voltage process; A peak voltage filtering subunit is configured to perform filtering processing on each of the plurality of peak sampled voltages to determine the filtered plurality of peak voltages; and The peak-to-average voltage determination subunit is configured to average the plurality of peak voltages to determine the peak-to-average voltage. The peak voltage filtering subunit includes: The peak voltage deviation absolute value determination unit is configured to determine the absolute value of the peak voltage deviation between each peak sampled voltage and the peak standard voltage; The first determination unit is configured to determine whether the absolute value of the peak voltage deviation is greater than a first voltage threshold; and The peak voltage determination unit is configured to use a peak standard voltage as the peak voltage when the absolute value of the peak voltage deviation is greater than the first voltage threshold, and to use the peak sampled voltage as the peak voltage when the absolute value of the peak voltage deviation is less than or equal to the first voltage threshold; wherein the peak standard voltage represents the peak voltage corresponding to the set voltage value under ideal welding conditions.

8. The arc length control device according to claim 7, wherein, The base value average voltage acquisition unit includes: The base value voltage sampling subunit is configured to read multiple base value sampling voltages during the output base value voltage process; A base value voltage filtering subunit is configured to perform filtering processing on each of the plurality of base value sampled voltages to determine the plurality of filtered base value voltages; and The base value average voltage determination subunit is configured to average the plurality of base value voltages to determine the base value average voltage.

9. The arc length control device according to claim 8, wherein, The base voltage filtering subunit includes: The base value voltage deviation absolute value determination unit is configured to determine the absolute value of the base value voltage deviation between each base value sampled voltage and the base value standard voltage; The second determination unit is configured to determine whether the absolute value of the base voltage deviation is greater than a second voltage threshold; and The base value voltage determination unit is configured to use a base value standard voltage as the base value voltage when the absolute value of the base value voltage deviation is greater than the second voltage threshold, and to use the base value sampled voltage as the base value voltage when the absolute value of the base value voltage deviation is less than or equal to the second voltage threshold.

10. The arc length control device according to claim 7, wherein, The pulse parameter adjustment unit includes: The peak current adjustment subunit is configured to adjust the peak current of the next pulse cycle based on the deviation between the arc length feedback value ALV and the set voltage value. The base current adjustment subunit is configured to adjust the base current for the next pulse cycle based on the deviation between the arc length feedback value ALV and the set voltage value; and The pulse period adjustment subunit is configured to adjust the pulse period of the next pulse period based on the deviation between the arc length feedback value ALV and the set voltage value.

11. A non-volatile storage medium having a processor-executable computer program stored thereon, the processor being configured to perform the arc length control method according to any one of claims 1 to 6 in response to the processor executing the computer program.

12. A computer program product comprising a processor-executable computer program, wherein when the computer program is executed by a processor, the processor is configured to perform operations of the arc length control method according to any one of claims 1 to 6.

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