AC waveform automatic adjustment control method and device

Abstract

An AC waveform automatic adjustment control method includes: collecting welding arc voltage during welding; determining a reference arc voltage; and determining adjustment parameters of the AC waveform according to the deviation between the welding arc voltage and the reference arc voltage. The relationship between the welding arc voltage and the reference arc voltage is used to judge the relationship between the welding arc length and the reference arc length. When the welding arc voltage increases, the AC rectangular wave is changed to a pulse waveform to increase the weld seam. When the welding arc voltage decreases, the AC rectangular wave is changed to a rounded rectangular wave to reduce the weld seam, thereby ensuring the consistency of the weld seam width. An AC waveform automatic adjustment control device is also disclosed.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the field of electric welding, and in particular, to an AC waveform automatic adjustment control method and device. Background Art

[0002] During the welding process of an electric welder, when the welding travel speed remains unchanged, the arc length will change due to the unevenness of the workpiece or the change in the distance between the welding gun and the workpiece during movement, thereby causing the weld width to change. Summary of the invention

[0003] To this end, an embodiment of the present disclosure provides an AC waveform automatic adjustment control method, which can effectively control the change in weld width, reduce the change in weld width or even keep it unchanged, which is beneficial to improving the aesthetics of the weld and the process requirements.

[0004] At least one embodiment of the present disclosure provides an AC waveform automatic adjustment control method, comprising:

[0005] Determine the welding arc voltage during welding;

[0006] determining a reference arc voltage; and

[0007] An adjustment parameter of the AC waveform is determined according to a deviation between the welding arc voltage and the reference arc voltage.

[0008] In one embodiment of the present disclosure, determining the welding arc voltage during the welding process includes:

[0009] Collect the voltage at the output end of the welding power supply;

[0010] Determine the voltage on the output cables; and

[0011] The welding arc voltage during the welding process is determined based on the voltage at the output terminal of the power supply and the voltage on the output cable.

[0012] In one embodiment of the present disclosure, determining the voltage on the output cable includes:

[0013] Determine or enter the resistance of the output cable;

[0014] collecting the output current of the welding power supply; and

[0015] Determine the voltage on the output cable.

[0016] In one embodiment of the present disclosure, the AC waveform automatic adjustment control method further includes: outputting an adjusted AC waveform according to an adjustment parameter of the AC waveform.

[0017] In one embodiment of the present disclosure, determining the reference arc voltage includes: collecting current during the welding process, and determining the reference arc voltage based on the current.

[0018] In one embodiment of the present disclosure, determining the reference arc voltage includes:

[0019] receiving a user arc length adjustment parameter input by a user; and

[0020] The current during the welding process is collected, and a reference arc voltage is determined based on the current and the user arc length adjustment parameter.

[0021] In one embodiment of the present disclosure, determining the adjustment parameter of the AC waveform according to the deviation between the welding arc voltage and the reference arc voltage includes:

[0022] When the welding arc voltage is greater than the reference arc voltage, the AC waveform is changed toward a pulse waveform, the peak current of the rising edge of the positive half cycle of the pulse is increased, the base current is reduced, and the duty cycle is adjusted, and the peak current of the falling edge of the negative half cycle of the pulse is increased, the base current is reduced, and the duty cycle is adjusted, wherein the effective value of the welding current before and after the adjustment remains unchanged; and

[0023] When the welding arc voltage is less than the reference arc voltage, the AC waveform is changed toward the direction of a rounded rectangular wave, increasing the radians at both ends of the positive half-cycle current and the radians at both ends of the negative half-cycle current of the rounded rectangular wave, wherein the effective value of the welding current before and after the adjustment remains unchanged.

[0024] In one embodiment of the present disclosure, determining the adjustment parameter of the AC waveform according to the deviation between the welding arc voltage and the reference arc voltage includes:

[0025] When the difference between the welding arc voltage and the reference arc voltage is greater than a first threshold value, the AC waveform is changed toward a pulse waveform, the peak current of the rising edge of the positive half cycle of the pulse is increased, the base current is reduced, and the duty cycle is adjusted, and the peak current of the falling edge of the negative half cycle of the pulse is increased, the base current is reduced, and the duty cycle is adjusted, wherein the effective value of the welding current before and after the adjustment remains unchanged; and

[0026] When the difference between the welding arc voltage and the reference arc voltage is less than the second threshold value, the waveform is changed toward the direction of a rounded rectangular wave, and the radians at both ends of the positive half-cycle current and the negative half-cycle current of the rounded rectangular wave are increased, wherein the effective value of the welding current before and after the adjustment remains unchanged.

[0027] At least one embodiment of the present disclosure further provides an AC waveform automatic adjustment control device, comprising:

[0028] An arc voltage collection unit configured to collect welding arc voltage during welding;

[0029] a reference arc voltage determination unit configured to determine a reference arc voltage;

[0030] a deviation determining unit configured to determine a deviation between the welding arc voltage and the reference arc voltage; and

[0031] The waveform adjustment parameter determination unit is configured to determine the adjustment parameter of the AC waveform according to the deviation.

[0032] In one embodiment of the present disclosure, the AC waveform automatic adjustment control device further includes: an output unit configured to adjust parameters according to the waveform of the pulse and output an adjusted AC waveform.

[0033] In one embodiment of the present disclosure, the arc voltage determination unit includes: a welding power supply output terminal voltage acquisition subunit, configured to acquire the welding power supply output terminal voltage; an output cable voltage determination unit, configured to determine the voltage on the output cable; and a determination subunit, configured to determine the welding arc voltage based on the welding power supply output terminal voltage and the voltage on the output cable.

[0034] In one embodiment of the present disclosure, the reference arc voltage determination unit includes a current collection subunit, the current collection subunit is configured to collect current during welding, and the reference arc voltage determination unit determines the reference arc voltage based on the current.

[0035] In one embodiment of the present disclosure, the AC waveform automatic adjustment control device also includes a user arc length adjustment parameter input unit, which is configured to receive a user arc length adjustment parameter input by a user, and the reference arc voltage determination unit is configured to determine the reference arc voltage based on the current and the user arc length adjustment parameter in response to the user arc length adjustment parameter input unit receiving the user arc length adjustment parameter input by the user.

[0036] In one embodiment of the present disclosure, the deviation determination unit also includes a threshold setting subunit, which is configured to set a first threshold and a second threshold. The deviation determination unit is configured to determine that the arc length becomes longer when the difference between the welding arc voltage and the reference arc voltage is greater than the first threshold, and to determine that the arc length becomes shorter when the difference between the welding arc voltage and the reference arc voltage is less than the second threshold.

[0037] In one embodiment of the present disclosure, the waveform adjustment parameter determination unit is configured to determine parameters of the arc length variable output pulse waveform in response to the deviation determination unit, and to determine parameters of the arc length shortened output rounded rectangular wave in response to the deviation determination unit.

[0038] In one embodiment of the present disclosure, the waveform adjustment parameter determination unit is configured to change the waveform toward the direction of the pulse waveform when the deviation determination unit determines that the arc length becomes longer, increase the peak current at the rising edge of the positive half-cycle of the pulse, reduce the base current and adjust the duty cycle, and increase the peak current at the falling edge of the negative half-cycle of the pulse, reduce the base current and adjust the duty cycle, wherein the effective value of the welding current before and after the adjustment remains unchanged, and is configured to change the waveform toward the direction of the rounded rectangular wave when the deviation determination unit determines that the arc length becomes shorter, increase the radian at both ends of the positive half-cycle current of the rounded rectangular wave and the radian at both ends of the negative half-cycle current, wherein the effective value of the welding current before and after the adjustment remains unchanged.

[0039] At least one embodiment of the present disclosure provides a non-volatile storage medium having stored thereon a computer program executable by a processor. In response to the processor executing the computer program, the processor is configured to implement the operations in any of the above-mentioned AC waveform automatic adjustment control methods.

[0040] At least one embodiment of the present disclosure provides a computer program product, which includes a processor-executable computer program. When the computer program is executed by a processor, the processor is configured to implement the operations in any of the above-mentioned AC waveform automatic adjustment control methods.

[0041] In the AC waveform automatic adjustment control method and device according to the embodiment of the present disclosure, the relationship between the welding arc voltage and the reference arc voltage is used to judge the relationship of the welding arc length relative to the reference arc length. When the welding arc voltage increases, the AC rectangular wave is changed to a pulse waveform to increase the weld seam. When the welding arc voltage decreases, the AC rectangular wave is changed to a rounded rectangular wave to reduce the weld seam, thereby ensuring the consistency of the weld seam width. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 The relationship between arc length and weld width during welding is shown;

[0043] Figure 2 A flow chart of an AC waveform automatic adjustment control method according to an embodiment of the present disclosure is shown;

[0044] Figure 3 A flow chart of determining the welding arc voltage during welding in the AC waveform automatic adjustment control method according to an embodiment of the present disclosure is shown;

[0045] Figure 4 A flow chart of an AC waveform automatic adjustment control method according to another embodiment of the present disclosure is shown;

[0046] Figure 5A flow chart of determining a reference arc voltage in an AC waveform automatic adjustment control method according to an embodiment of the present disclosure is shown;

[0047] Figure 6 A schematic diagram showing an adjustment waveform in an AC waveform automatic adjustment control method according to an embodiment of the present disclosure is shown;

[0048] Figure 7 A structural block diagram of an AC waveform automatic adjustment control device according to an embodiment of the present disclosure is shown; and

[0049] Figure 8 A structural block diagram of an arc voltage determination unit in an AC waveform automatic adjustment control device according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0050] The present disclosure is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present disclosure will become more clear and distinct.

[0051] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0052] In addition, the technical features involved in different embodiments of the present disclosure described below can be combined with each other as long as they do not conflict with each other.

[0053] As aluminum and aluminum alloy materials are increasingly used in modern industrial production, especially in the automotive manufacturing, aerospace, shipbuilding and other fields, aluminum welding has also increased with the increase in the application of aluminum alloys. AC TIG aluminum welding, as a type of aluminum welding, plays an important role in aluminum welding.

[0054] During automatic welding, the welding speed is constant. Due to the uneven surface of the workpiece or the poor linearity of large workpieces, the distance between the workpiece and the tungsten electrode will change. During manual welding, the distance between the workpiece and the tungsten electrode may also change due to manual errors such as the welder's control of the welding gun.

[0055] When the distance between the workpiece and the tungsten electrode changes, if the arc remains unchanged, the width of the weld will change. Figure 1 The figure shows the change of weld width caused by the change of the distance between the workpiece and the tungsten electrode when there is no weld width control (ie, the arc shape does not change).

[0056] like Figure 1As shown in the figure, in the standard state S, when the distance between the tungsten electrode and the workpiece is L2, the weld width is d2; when the distance between the tungsten electrode and the workpiece decreases to the S- state, the distance between the tungsten electrode and the workpiece is L1, and the weld width is d1; when the distance between the tungsten electrode and the workpiece increases to the S+ state, the distance between the tungsten electrode and the workpiece is L3, and the weld width is d3. After experiments and theoretical derivations, the arc isotherms are as follows Figure 1 As shown in the figure, the closer to the tungsten tip, the higher the arc temperature, and the farther away, the lower the temperature. The width of the weld of the workpiece is related to the temperature and time of heating the workpiece. The higher the heating temperature and the longer the heating time, the easier it is for the workpiece to melt. When the walking speed is equal, the width of the weld is only related to the temperature of the contact position between the arc and the workpiece, that is, the closer the distance, the wider the weld, and the farther the distance, the narrower the weld. As can be seen from the figure, when L1 <L2<L3,d1> d2>d3.

[0057] In order to keep the weld width unchanged when the distance between the tungsten electrode and the workpiece changes, it is necessary to adjust the arc shape when the distance between the tungsten electrode and the workpiece changes, so as to keep the weld width consistent.

[0058] The embodiments of the present disclosure provide an AC waveform automatic adjustment control method, so as to adjust the arc shape and keep the weld width consistent when the distance between the tungsten electrode and the workpiece changes.

[0059] At least one embodiment of the present disclosure provides an AC waveform automatic adjustment control method, such as Figure 2 As shown, including:

[0060] S01, determining the welding arc voltage during the welding process;

[0061] S02, determining a reference arc voltage; and

[0062] S03, determining adjustment parameters of the AC waveform according to the deviation between the welding arc voltage and the reference arc voltage.

[0063] In one embodiment of the present disclosure, Figure 3 As shown, determining the welding arc voltage during the welding process includes: S011, collecting the voltage at the output end of the welding power supply; S012, determining the voltage on the output cable; and S013, determining the welding arc voltage during the welding process based on the voltage at the output end of the power supply and the voltage on the output cable.

[0064] The resistance on the output cable can be automatically determined, and then the voltage on the output cable can be determined by sampling the output current of the welding power supply. Alternatively, the resistance on the output cable can be input, and then the voltage on the output cable can be determined by sampling the output current of the welding power supply.

[0065] In one embodiment of the present disclosure, Figure 4As shown, the AC waveform automatic adjustment control method further includes: after determining the adjustment parameters of the AC waveform, the AC waveform automatic adjustment control method further includes:

[0066] S04. Output the adjusted AC waveform according to the adjustment parameters of the AC waveform.

[0067] During the welding process, collect the power supply output voltage Uf, subtract the output terminal cable voltage, and use it as the welding arc voltage Uw during the welding process to objectively reflect the arc length, that is, the distance between the tungsten electrode and the workpiece.

[0068] In an embodiment of the present disclosure, determining the reference arc voltage includes: collecting the current during the welding process and determining the reference arc voltage based on the current.

[0069] In TIG welding, the current output during the welding process is equal to the current set value. At this time, based on the current output during the welding process, the standard arc voltage can be obtained. Since the current output during the welding process is equal to the preset current value, at this time, the reference arc voltage is actually the standard arc voltage. The standard arc voltage Ud = a * If + b, where If is the collected current value, and a and b are constants, which is the system default standard arc voltage. Take this standard arc voltage as the reference arc voltage Ur. There is a corresponding relationship between the arc length Ld between the tungsten electrode and the workpiece and the arc voltage, and the arc voltage can indirectly reflect the arc length.

[0070] In an embodiment according to the present disclosure, the arc length corresponding to the determined reference arc voltage will be used as the reference arc length. When Uw > Ur, it is determined that the arc voltage increases and the arc length becomes longer. At this time, according to the deviation between the welding arc voltage and the reference arc voltage, determine the waveform adjustment parameters of the pulse to make the weld wider, and then output the adjusted pulse waveform according to the waveform adjustment parameters of the pulse. When Uw < Ur, it is determined that the arc voltage decreases and the arc length becomes shorter. At this time, according to the deviation between the welding arc voltage and the reference arc voltage, determine the adjustment parameters of the rounded rectangular wave to make the weld narrower, and then output the adjusted AC waveform according to the adjustment parameters of the AC waveform.

[0071] In an embodiment of the present disclosure, as Figure 5 shown, determining the reference arc voltage includes: S021. Receive the user arc length adjustment parameter input by the user; and S022. Collect the current during the welding process and determine the reference arc voltage based on the current and the user arc length adjustment parameter.

[0072] If the user arc length adjustment parameter input by the user is Us, then the reference arc voltage is Ur = Ud + Us, where Ud = a * If + b, If is the collected current value, a and b are constants, and Us is the user arc length adjustment parameter input by the user. When Uw > Ur, it is determined that the arc voltage increases and the arc length becomes longer. At this time, according to the deviation between the welding arc voltage and the reference arc voltage, the AC waveform is changed in the direction of the pulse waveform, increasing the peak current of the rising edge of the positive half cycle of the pulse, decreasing the base current and adjusting the duty cycle, and increasing the peak current of the falling edge of the negative half cycle of the pulse, decreasing the base current and adjusting the duty cycle, where the effective value of the welding current before and after adjustment remains unchanged, and the adjusted pulse waveform is output. When Uw < Ur, it is determined that the arc voltage decreases and the arc length becomes shorter. At this time, according to the deviation between the welding arc voltage and the reference arc voltage, the AC waveform is changed in the direction of the rounded rectangle wave, increasing the radian at both ends of the current in the positive half cycle of the rounded rectangle wave and the radian at both ends of the current in the negative half cycle, where the effective value of the welding current before and after adjustment remains unchanged.

[0073] For example, in an embodiment of the present disclosure, taking welding with a current of 200A as an example to calculate the standard arc length, where the parameter a is taken as 0.04 and b is taken as 10, the calculated standard arc voltage Ud is 18V. When the user does not input the user arc length adjustment parameter, the reference arc voltage can be determined as 18V. If the user inputs the user arc length adjustment parameter as -1, then the reference arc voltage is Ur = 18 - 1 = 17V. If the user inputs the user arc length adjustment parameter as 1, then the reference arc voltage is Ur = 18 + 1 = 19V.

[0074] Figure 6 FIG. shows a schematic diagram of determining the adjustment parameter of the AC waveform according to the deviation between the welding arc voltage and the reference arc voltage in the AC waveform automatic adjustment control method according to an embodiment of the present disclosure. When Uw > Ur, it is determined that the welding arc voltage increases and the arc length becomes longer. At this time, it is necessary to output the AC waveform in the direction of the pulse waveform to make the weld bead wider. As Figure 6 The waveform B shown in is the standard waveform. If Uw > Ur at this time, it is determined that the welding arc voltage increases and the arc length becomes longer, and it is necessary to increase the energy output of the pulse to make the weld bead wider. In the corresponding adjusted waveform A, the AC waveform is changed in the direction of the pulse waveform, increasing the peak current of the rising edge of the positive half cycle of the pulse, decreasing the base current and adjusting the duty cycle, and increasing the peak current of the falling edge of the negative half cycle of the pulse, decreasing the base current and adjusting the duty cycle, where the effective value of the welding current before and after adjustment remains unchanged. For Figure 6For waveform B in [the above situation], when Uw < Ur, it is determined that the arc voltage decreases and the arc length shortens. It is necessary to reduce the energy output of the pulse to narrow the weld seam. In the adjusted waveform C for one [welding situation], the AC waveform is changed towards the rounded rectangular wave direction, increasing the radian at both ends of the current in the positive half cycle and the radian at both ends of the current in the negative half cycle of the rounded rectangular wave. Among them, the effective value of the welding current remains unchanged before and after the adjustment.

[0075] In an embodiment of the present disclosure, according to the deviation between the welding arc voltage and the reference arc voltage, determining the waveform adjustment parameters of the pulse includes:

[0076] In the case where the welding arc voltage is greater than the reference arc voltage, the AC waveform is changed towards the pulse waveform direction, increasing the peak current of the rising edge in the positive half cycle of the pulse, reducing the base current and adjusting the duty cycle, and increasing the peak current of the falling edge in the negative half cycle of the pulse, reducing the base current and adjusting the duty cycle. Among them, the effective value of the welding current remains unchanged before and after the adjustment; and

[0077] In the case where the welding arc voltage is less than the reference arc voltage, the waveform is changed towards the rounded rectangular wave direction, increasing the radian at both ends of the current in the positive half cycle and the radian at both ends of the current in the negative half cycle of the rounded rectangular wave. Among them, the effective value of the welding current remains unchanged before and after the adjustment.

[0078] In some embodiments of the present disclosure, the waveform adjustment parameters of the pulse are not adjusted as long as the welding arc voltage is greater than or less than the reference arc voltage. Instead, when the difference between the reference arc voltage and the reference arc voltage is greater than the first threshold, it is determined that the arc voltage increases, and when the difference between the reference arc voltage and the reference arc voltage is less than the second threshold, it is determined that the arc voltage decreases.

[0079] In an embodiment of the present disclosure, according to the deviation between the welding arc voltage and the reference arc voltage, determining the adjustment parameters of the AC waveform includes:

[0080] In the case where the difference between the welding arc voltage and the reference arc voltage is greater than the first threshold, the AC waveform is changed towards the pulse waveform direction, increasing the peak current of the rising edge in the positive half cycle of the pulse, reducing the base current and adjusting the duty cycle, and increasing the peak current of the falling edge in the negative half cycle of the pulse, reducing the base current and adjusting the duty cycle. Among them, the effective value of the welding current remains unchanged before and after the adjustment; and

[0081] In the case where the difference between the welding arc voltage and the reference arc voltage is less than the second threshold, the waveform is changed towards the rounded rectangular wave direction, increasing the radian at both ends of the current in the positive half cycle and the radian at both ends of the current in the negative half cycle of the rounded rectangular wave. Among them, the effective value of the welding current remains unchanged before and after the adjustment.

[0082] Continue to use the 200A variable current welding mentioned above, parameters a = 0.04, b = 10, as an example for explanation. Assuming that the user inputs the user arc length adjustment parameter as -1, then the reference arc voltage is Ur = 18-1 = 17V. Take the first threshold as 0.3V and the second threshold as -0.3V. When the welding arc voltage is greater than 17.3V, the difference between the welding arc voltage and the reference arc voltage is greater than the first threshold, and it is determined that the arc voltage becomes larger and the arc length becomes longer. At this time, adjust the waveform parameters to make the output arc wider. When the welding arc voltage is less than 16.7V, the difference between the welding arc voltage and the reference arc voltage is less than the second threshold, and it is determined that the arc voltage becomes smaller and the arc length becomes shorter. At this time, adjust the waveform parameters to make the output arc narrower.

[0083] In the embodiments of the present disclosure, the relationship between the welding arc voltage and the reference arc voltage is used to determine the relationship of the arc length relative to the standard arc length. When the welding arc voltage increases, the pulse energy output is increased to increase the weld seam. When the welding arc voltage decreases, the pulse energy output is reduced to reduce the weld seam, thereby ensuring the consistency of the weld seam width.

[0084] The embodiments of the present disclosure also provide an AC waveform automatic adjustment control device to adjust the arc shape when the distance between the tungsten electrode and the workpiece changes, so as to keep the weld width consistent.

[0085] At least one embodiment of the present disclosure provides an AC waveform automatic adjustment control device, such as Figure 7 As shown, the AC waveform automatic adjustment control device 600 includes:

[0086] An arc voltage determination unit 601, configured to determine a welding arc voltage during welding;

[0087] A reference arc voltage determining unit 602, configured to determine a reference arc voltage;

[0088] a deviation determining unit 603, configured to determine a deviation between the welding arc voltage and the reference arc voltage; and

[0089] The waveform adjustment parameter determination unit 604 is configured to determine an adjustment parameter of the AC waveform according to the deviation.

[0090] In one embodiment of the present disclosure, Figure 7 As shown, the AC waveform automatic adjustment control device further includes an output unit 605 configured to output an adjusted AC waveform according to the adjustment parameters of the AC waveform.

[0091] In one embodiment of the present disclosure, Figure 8As shown, the arc voltage determination unit 601 includes: a welding power supply output terminal voltage acquisition subunit 6011, configured to acquire the welding power supply output terminal voltage; an output cable voltage determination unit 6012, configured to determine the voltage on the output cable; and a determination subunit 6013, configured to determine the welding arc voltage based on the welding power supply output terminal voltage and the voltage on the output cable.

[0092] In one embodiment of the present disclosure, the reference arc voltage determining unit 602 includes a current collecting subunit, and the current collecting subunit is configured to collect current during welding. The reference arc voltage determining unit 602 determines the reference arc voltage based on the current.

[0093] In one embodiment of the present disclosure, the AC waveform automatic adjustment control device 600 further includes a user arc length adjustment parameter input unit 606 configured to receive a user arc length adjustment parameter input by a user.

[0094] In the case where the AC waveform automatic adjustment control device 600 includes the user arc length adjustment parameter input unit 606, in response to the user arc length adjustment parameter input unit 606 receiving the user arc length adjustment parameter input by the user, the reference arc voltage determination unit 602 determines the reference arc voltage based on the current and the user arc length adjustment parameter.

[0095] In one embodiment of the present disclosure, the deviation determination unit 603 also includes a threshold setting subunit, which is configured to set a first threshold and a second threshold. The deviation determination unit 603 is configured to determine that the arc length becomes longer when the difference between the welding arc voltage and the reference arc voltage is greater than the first threshold, and to determine that the arc length becomes shorter when the difference between the welding arc voltage and the reference arc voltage is less than the second threshold.

[0096] In one embodiment of the present disclosure, the waveform adjustment parameter determination unit 604 is configured to change the AC waveform towards the direction of the pulse waveform when the deviation determination unit 603 determines that the arc length becomes longer, increase the peak current at the rising edge of the positive half-cycle of the pulse, reduce the base current and adjust the duty cycle, and increase the peak current at the falling edge of the negative half-cycle of the pulse, reduce the base current and adjust the duty cycle, wherein the effective value of the welding current before and after the adjustment remains unchanged, and is configured to change the AC waveform towards the direction of the rounded rectangular wave when the deviation determination unit 603 determines that the arc length becomes shorter, increase the radian at both ends of the positive half-cycle current of the rounded rectangular wave and the radian at both ends of the negative half-cycle current, wherein the effective value of the welding current before and after the adjustment remains unchanged.

[0097] The implementation of each unit module in the AC waveform automatic adjustment control device according to the embodiment of the present disclosure is the same as the implementation method of the steps in the AC waveform automatic adjustment control method embodiment mentioned above in this article. For specific implementation, please refer to the AC waveform automatic adjustment control method embodiment mentioned above.

[0098] In the AC waveform automatic adjustment control device according to the embodiment of the present disclosure, the relationship between the welding arc voltage and the reference arc voltage is used to judge the relationship of the welding arc length relative to the reference arc length, so as to adjust the AC waveform parameters. That is, when the welding arc voltage increases, the AC rectangular wave is changed to a pulse waveform to increase the weld seam; when the welding arc voltage decreases, the AC rectangular wave is changed to a rounded rectangular wave to reduce the weld seam, thereby ensuring the consistency of the weld seam width.

[0099] At least one embodiment of the present disclosure provides a non-volatile storage medium having stored thereon a computer program executable by a processor. In response to the processor executing the computer program, the processor is configured to implement the operations in any of the above-mentioned AC waveform automatic adjustment control methods.

[0100] At least one embodiment of the present disclosure provides a computer program product, which includes a processor-executable computer program. When the computer program is executed by a processor, the processor is configured to implement the operations in any of the above-mentioned AC waveform automatic adjustment control methods.

[0101] In the description of the present disclosure, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inside", "outside", "front", "back", "left", "right", etc. are directions or positional relationships based on the working state of the present disclosure, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present disclosure.

[0102] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0103] The present disclosure has been described above in conjunction with preferred embodiments, but these embodiments are only exemplary and serve only as an illustration. On this basis, various replacements and improvements may be made to the present disclosure, all of which fall within the scope of protection of the present disclosure.

Claims

1. A method for automatically adjusting and controlling an AC waveform, comprising: Determine the welding arc voltage during welding; Determine the reference arc voltage; as well as Determining adjustment parameters of the AC waveform according to a deviation between the welding arc voltage and the reference arc voltage; Wherein, determining the adjustment parameter of the AC waveform according to the deviation between the welding arc voltage and the reference arc voltage includes: When the difference between the welding arc voltage and the reference arc voltage is greater than a first threshold value, the AC waveform is changed toward a pulse waveform, the peak current of the rising edge of the positive half cycle of the pulse is increased, the base current is reduced, and the duty cycle is adjusted, and the peak current of the falling edge of the negative half cycle of the pulse is increased, the base current is reduced, and the duty cycle is adjusted, wherein the effective value of the welding current before and after the adjustment remains unchanged; and When the difference between the welding arc voltage and the reference arc voltage is less than a second threshold value, the waveform is changed toward a rounded rectangular wave, and the arcs at both ends of the positive half-cycle current and the arcs at both ends of the negative half-cycle current of the rounded rectangular wave are increased, wherein the effective value of the welding current before and after the adjustment remains unchanged; or Wherein, determining the adjustment parameter of the AC waveform according to the deviation between the welding arc voltage and the reference arc voltage includes: When the welding arc voltage is greater than the reference arc voltage, the AC waveform is changed toward a pulse waveform, the peak current of the rising edge of the positive half cycle of the pulse is increased, the base current is reduced, and the duty cycle is adjusted, and the peak current of the falling edge of the negative half cycle of the pulse is increased, the base current is reduced, and the duty cycle is adjusted, wherein the effective value of the welding current before and after the adjustment remains unchanged; and When the welding arc voltage is less than the reference arc voltage, the AC waveform is changed toward the direction of a rounded rectangular wave, increasing the radians at both ends of the positive half-cycle current and the radians at both ends of the negative half-cycle current of the rounded rectangular wave, wherein the effective value of the welding current before and after the adjustment remains unchanged.

2. The AC waveform automatic adjustment control method according to claim 1, wherein: Determining the welding arc voltage during welding includes: Collect the voltage at the output end of the welding power supply; Determine the voltage on the output cables; and The welding arc voltage during the welding process is determined based on the voltage at the output terminal of the power supply and the voltage on the output cable.

3. The AC waveform automatic adjustment control method according to claim 2, wherein: Determining the voltage on the output cable includes: Determine or enter the resistance of the output cable; collecting the output current of the welding power supply; and Determine the voltage on the output cable.

4. The AC waveform automatic adjustment control method according to claim 1 further comprises: According to the adjustment parameters of the AC waveform, an adjusted AC waveform is output.

5. The AC waveform automatic adjustment control method according to claim 1, wherein: Determining the reference arc voltage includes: collecting the current during the welding process, and determining the reference arc voltage based on the current.

6. The AC waveform automatic adjustment control method according to claim 1, wherein: Determining the reference arc voltage includes: receiving a user arc length adjustment parameter input by a user; and The current during the welding process is collected, and a reference arc voltage is determined based on the current and the user arc length adjustment parameter.

7. An AC waveform automatic adjustment control device, comprising: an arc voltage determination unit configured to determine a welding arc voltage during welding; a reference arc voltage determination unit configured to determine a reference arc voltage; a deviation determination unit configured to determine a deviation between the welding arc voltage and the reference arc voltage; as well as a waveform adjustment parameter determination unit configured to determine an adjustment parameter of the AC waveform according to the deviation; Wherein, the waveform adjustment parameter determination unit is configured to determine the adjustment parameters of the AC waveform according to the deviation, including: the waveform adjustment parameter determination unit is configured to change the waveform towards the direction of the pulse waveform when the deviation determination unit determines that the arc length becomes longer, increase the peak current of the rising edge of the positive half-cycle of the pulse, reduce the base current and adjust the duty cycle, and increase the peak current of the falling edge of the negative half-cycle of the pulse, reduce the base current and adjust the duty cycle, wherein the effective value of the welding current before and after the adjustment remains unchanged, and is configured to change the waveform towards the direction of the rounded rectangular wave when the deviation determination unit determines that the arc length becomes shorter, increase the radian at both ends of the positive half-cycle current of the rounded rectangular wave and the radian at both ends of the negative half-cycle current, wherein the effective value of the welding current before and after the adjustment remains unchanged.

8. The AC waveform automatic adjustment control device according to claim 7, further comprising: The output unit is configured to output an adjusted AC waveform according to the adjustment parameters of the AC waveform.

9. The AC waveform automatic adjustment control device according to claim 7, wherein: The arc voltage determination unit comprises: A welding power supply output terminal voltage acquisition subunit, configured to acquire the welding power supply output terminal voltage; an output cable voltage determination unit configured to determine a voltage on the output cable; and The determination subunit is configured to determine the welding arc voltage based on the voltage at the output terminal of the welding power source and the voltage on the output cable.

10. The AC waveform automatic adjustment control device according to claim 7, wherein: The reference arc voltage determination unit includes a current collection subunit, and the current collection subunit is configured to collect current during welding. The reference arc voltage determination unit determines the reference arc voltage based on the current.

11. The AC waveform automatic adjustment control device according to claim 7, wherein: The AC waveform automatic adjustment control device further comprises a user arc length adjustment parameter input unit configured to receive a user arc length adjustment parameter input by a user, and the reference arc voltage determination unit is configured to respond to the user arc length adjustment parameter input unit receiving the user arc length adjustment parameter input by the user; And the current during the welding process is collected, and the reference arc voltage is determined based on the current and the user arc length adjustment parameter.

12. The AC waveform automatic adjustment control device according to claim 7, wherein: The deviation determination unit also includes a threshold setting subunit, which is configured to set a first threshold and a second threshold. The deviation determination unit is configured to determine that the arc length becomes longer when the difference between the welding arc voltage and the reference arc voltage is greater than the first threshold, and to determine that the arc length becomes shorter when the difference between the welding arc voltage and the reference arc voltage is less than the second threshold.

13. The AC waveform automatic adjustment control device according to claim 7, wherein: The waveform adjustment parameter determination unit is configured to determine parameters of an arc length variable output pulse waveform in response to the deviation determination unit, and to determine parameters of an arc length variable output rounded rectangular wave in response to the deviation determination unit.

14. A non-volatile storage medium having stored thereon a computer program executable by a processor, wherein in response to the processor executing the computer program, the processor is configured to implement the operations in the AC waveform automatic adjustment control method as claimed in any one of claims 1 to 6.

15. 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 implement the operations in the AC waveform automatic adjustment control method according to any one of claims 1 to 6.

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