Pulse welding control method and device

Abstract

The present invention provides a pulse welding control method and device, the method comprising: obtaining the pulse parameters of the pulse welding current of the current pulse cycle; when determining that a short circuit occurs in the current pulse cycle, determining the time interval between the start time of the current pulse cycle and the time when the short circuit occurs; and adjusting the pulse waveform of the welding current of the next pulse cycle according to the pulse parameters and the time interval. By using the pulse parameters of the welding current of the current pulse cycle and the short circuit situation to adjust the pulse waveform of the welding current of the next pulse cycle, real-time adjustment after the short circuit occurs is achieved, thereby ensuring the stability of the droplet shedding moment in each pulse cycle, improving the stability of the welding process, and further improving the welding effect.

Description

Technical Field

[0001] The invention relates to the technical field of consumable gas shielded welding, and in particular to a pulse welding control method and device. Background Art

[0002] Pulse MIG / MAG welding is increasingly used in engineering applications due to its stable welding process, better process control and minimal welding spatter.

[0003] like Figure 1 As shown, in general pulse MIG / MAG welding, it is necessary to ensure a stable droplet transition state of one pulse and one droplet, and the droplet falls off at the moment when the pulse falls to the base value (such as Figure 1 Point c shown in the figure is ideal. This welding process is the most stable and the welding process is the easiest to control. The droplet transfer process of multi-pulse one drop and one pulse multiple drop is unstable, which affects the welding effect. When one pulse one drop is transferred, if the droplet transfer is at the falling edge of the pulse (such as Figure 1 b), or even at the peak stage (as shown in Figure 1 When the droplet falls forward, a short circuit will occur, and the current and voltage from the short circuit to the arc will be large, and the energy will be high, which will cause a violent explosion and produce very large welding spatter. Figure 1 When the droplet falls off later, it will affect the heat input of the next pulse cycle, making it difficult for the droplet to fall off in the next pulse cycle, and will also affect the stable welding state. However, in the actual welding process, the moment of droplet falling off is not stable, making the welding process extremely unstable, resulting in poor welding effect. Summary of the invention

[0004] The object of the present invention is to provide a pulse welding control method and device for improving the stability of welding process and welding effect.

[0005] To achieve the above object, the present invention provides a pulse welding control method, which comprises:

[0006] Determining pulse parameters of the pulse welding current in the current pulse cycle;

[0007] When it is determined that a short circuit occurs in the current pulse cycle, determining the time interval between the start time of the current pulse cycle and the time when the short circuit occurs;

[0008] According to the pulse parameters and the time interval, the pulse waveform of the welding current in the next pulse cycle is adjusted.

[0009] The present invention provides a pulse welding control device for improving the stability of the welding process and improving the welding effect, which includes:

[0010] A current parameter acquisition module is used to obtain the pulse parameters of the pulse welding current in the current pulse cycle;

[0011] A short circuit determination module, used to determine the time interval between the start time of the current pulse cycle and the time when the short circuit occurs when it is determined that the current pulse cycle has a short circuit;

[0012] The current adjustment module is used to adjust the pulse waveform of the welding current in the next pulse cycle according to the pulse parameters and the time interval.

[0013] An embodiment of the present invention further provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the pulse welding control method as described above when executing the computer program.

[0014] The embodiment of the present invention obtains the pulse parameters of the pulse welding current of the current pulse cycle; when it is determined that a short circuit occurs in the current pulse cycle, the time interval between the start time of the current pulse cycle and the time interval of the short circuit occurs is determined; and the pulse waveform of the welding current of the next pulse cycle is adjusted according to the pulse parameters and the time interval. By using the pulse parameters of the welding current of the current pulse cycle and the short circuit situation to adjust the pulse waveform of the welding current of the next pulse cycle, real-time adjustment after the short circuit occurs is achieved, thereby ensuring the stability of the droplet shedding moment in each pulse cycle, improving the stability of the welding process, and further improving the welding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The following drawings are intended only to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0016] Figure 1 It is a pulse waveform diagram for calibrating the short circuit occurrence position;

[0017] Figure 2 Schematic diagram of the implementation process of the pulse welding control method according to an embodiment of the present invention;

[0018] Figure 3 is a schematic diagram of an implementation process of determining a location where a short circuit occurs in an embodiment of the present invention;

[0019] Figure 4 is a flow chart of pulse welding control in a specific example of the present invention;

[0020] Figure 5 is a schematic structural diagram of a pulse welding control device according to an embodiment of the present invention;

[0021] Figure 6 It is a structural schematic diagram of a computer device in an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The present application is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present application will become clearer and more specific.

[0023] 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.

[0024] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0025] The inventors found that the moment when the molten droplet falls off affects the stability of welding. Only when one pulse and one droplet can be achieved within one pulse cycle, the molten droplet transition process is the most stable, and such a welding process is also the most stable and the welding process is easiest to control. The transition state of one pulse and one droplet is related to many factors, mainly:

[0026] Heat input, the main parameters for controlling heat input are welding current and welding voltage. In a general stable welding process, welding current and welding voltage are matched in a unified way, that is, each welding current corresponds to an optimal matching voltage. However, in actual production, in order to improve efficiency and increase welding speed, lower welding voltage is used for welding in most cases. The voltage reduction will cause insufficient energy in a single pulse cycle, resulting in multiple pulses with one drop or the droplet falling off later, disrupting the droplet transition state of one pulse with one drop.

[0027] The ratio of shielding gas, the shielding gas used in standard pulse MAG welding is 80% Ar + 20% CO2 mixed gas, and the shielding gas used in pulse MIG welding is 98% Ar + 2% CO2 mixed gas. However, in actual production, in order to reduce costs, most of the mixed gases used in welding are self-proportioned by welding operators, resulting in differences between the actual ratio and the standard gas ratio, and even large differences. When the gas ratio deviates greatly from the standard ratio, it will directly lead to changes in the state of droplet transition: too high Ar gas will make it difficult for the droplet to shrink and fall off, and too high CO2 gas will cause uneven droplet size, and even rejection transition. These situations will destroy the transition state of one pulse and one drop.

[0028] The proportion of alloying elements and the state of the welding wire. The melting and boiling points of each alloying element are different, resulting in different heat required for melting. Welding wire is composed of a variety of alloying elements. The actual proportion of alloying elements in welding wires from different manufacturers will be different, especially in stainless steel welding wires. This leads to different melting speeds of welding wires under the same heat input. That is, some welding wires are easier to melt or less likely to melt, which will cause the molten drop to fall off forward (when the welding wire is easy to melt) or backward (when the welding wire is not easy to melt), and will also destroy the droplet transition state of one pulse and one drop. In addition, the smoothness of the welding wire surface and the surface state of the welding wire caused by the wire drawing process will be very different, which is also a major reason for the unstable molten drop transition.

[0029] It can be seen that based on the differences in the above three points, in the actual welding process, for a certain gas, welding wire and current and voltage values, a stable state of one pulse and one drop can be achieved. However, after the conditions change, it is difficult to achieve the ideal one pulse and one drop transition state. However, it is difficult to ensure the ideal welding conditions in actual welding, and it is impossible to ensure the stability of the molten droplet transfer process, which leads to unstable welding process and poor welding effect.

[0030] Based on the above findings, an embodiment of the present invention provides a pulse welding control method to improve the stability of the welding process and improve the welding effect. Figure 2 As shown, including:

[0031] Step 201: obtaining pulse parameters of the pulse welding current in the current pulse cycle;

[0032] Step 202: when it is determined that a short circuit occurs in the current pulse cycle, determine the time interval between the start time of the current pulse cycle and the time when the short circuit occurs;

[0033] Step 203: adjusting the pulse waveform of the welding current in the next pulse cycle according to the pulse parameters and the time interval.

[0034] In a specific embodiment, the pulse parameters of the pulse welding current of the current pulse cycle are obtained; when it is determined that a short circuit occurs in the current pulse cycle, the time interval between the start of the current pulse cycle and the time interval of the short circuit is determined; and the pulse waveform of the welding current of the next pulse cycle is adjusted according to the pulse parameters and the time interval. By using the pulse parameters of the welding current of the current pulse cycle and the short circuit situation to adjust the pulse waveform of the welding current of the next pulse cycle, real-time adjustment after the short circuit occurs is achieved, thereby ensuring the stability of the droplet shedding moment in each pulse cycle, improving the stability of the welding process, and thus improving the welding effect.

[0035] First, the pulse parameters of the pulse welding current of the current pulse cycle are obtained. In a specific embodiment, the pulse parameters at least include: the pulse cycle ( Figure 1T in), pulse rise time ( Figure 1 t1 in), peak duration ( Figure 1 t2) and pulse fall time ( Figure 1 t3 in ).

[0036] After obtaining the pulse parameters of the pulse welding current of the current pulse cycle, determine whether a short circuit occurs in the current pulse cycle. When it is determined that a short circuit occurs in the current pulse cycle, determine the time interval between the start of the current pulse cycle and the time when the short circuit occurs. That is, after the welding starts, the welding process is monitored in real time, and the timing is performed after the pulse of each pulse cycle starts. The time from the start of this cycle to the occurrence of the short circuit is recorded as t.

[0037] In specific implementation, if no short circuit occurs in the current pulse cycle, that is, the arc length during welding in this cycle is long, there is no need to adjust the pulse waveform of the welding current in the next pulse cycle, and it only needs to be consistent with the pulse waveform of the welding current in the current pulse cycle.

[0038] After determining the time interval between the start time of the current pulse cycle and the time when the short circuit occurs, the pulse waveform of the welding current of the next pulse cycle is adjusted according to the pulse parameters and the time interval.

[0039] The specific implementation process includes: determining the location where the short circuit occurs according to the above-mentioned pulse parameters and time interval;

[0040] According to the position where the short circuit occurs, the pulse waveform of the welding current in the next pulse cycle is adjusted.

[0041] According to the above pulse parameters and time interval, the specific implementation process of determining the location where the short circuit occurs is as follows: Figure 3 As shown, including:

[0042] Step 301: If the time interval is greater than the sum of the pulse rise time, the peak time and the pulse fall time, and the time interval is less than the pulse period, the position where the short circuit occurs is determined to be the first position;

[0043] Step 302: If the time interval is equal to the sum of the pulse rise time, the peak time and the pulse fall time, the location where the short circuit occurs is determined to be the second location;

[0044] Step 303: If the time interval is less than the sum of the pulse rising time, the peak time and the pulse falling time, it is determined that the position where the short circuit occurs is the third position.

[0045] Depend on Figure 1It can be seen that the first position is within the position range after point c, point d is an example of the first position, and it shows that when it is at the first position, the droplet transition is late in the pulse cycle and the energy is insufficient. The second position is point c in the figure, indicating that the droplet falls off properly and does not need to be adjusted. The third position is within the position range before point c, and points a and b in the figure are two examples of the third position, indicating that the droplet falls off early, the energy is high, and a violent explosion will occur.

[0046] In a specific embodiment, for three positions, the pulse waveform of the welding current of the next pulse cycle needs to be adjusted differently. In specific implementation, if the position where the short circuit occurs is the first position, the peak value, base value and cycle value of the pulse welding current of the next pulse cycle are adjusted according to the following formula:

[0047] I′ P =I P +A1[1-t / (t1+t2+t3)]

[0048] I′ b =I b +B1[1-t / (t1+t2+t3)]

[0049] T′=T+K1[1-t / (t1+t2+t3)]

[0050] Among them, I′ P Represents the peak value of the pulse welding current of the next pulse cycle, A; I P Represents the peak value of the pulse welding current of the current pulse cycle, A; A1 represents the first adjustment coefficient of the pulse peak value, ranging from 30 to 500; t represents the time interval between the start of the current pulse cycle and the time when the short circuit occurs, s; t1 represents the pulse rise time of the pulse welding current of the current pulse cycle, s; t2 represents the peak time of the pulse welding current of the current pulse cycle, s; t3 represents the pulse fall time of the pulse welding current of the current pulse cycle, s; I′ b Represents the base value of the pulse welding current for the next pulse cycle, A; I b Represents the base value of the pulse welding current of the current pulse cycle, A; B1 represents the first adjustment coefficient of the pulse base value, ranging from 20 to 80; T′ represents the cycle value of the pulse welding current of the next pulse cycle, s; T represents the cycle value of the pulse welding current of the current pulse cycle, s; K1 represents the first adjustment coefficient of the pulse cycle, ranging from 1 to 10.

[0051] Among them, the adjustment coefficients will be different for different shielding gases, welding wires of different materials and welding wires of different diameters. In specific implementation, the values ​​of the above three coefficients for each welding are determined through multiple tests.

[0052] If the short circuit occurs at the second position, the pulse waveform of the welding current in the next pulse cycle is controlled to be the same as the pulse waveform of the welding current in the current pulse cycle, that is, there is no need to adjust the pulse waveform of the welding current in the next pulse cycle.

[0053] If the short circuit occurs at the third position, determine the duration of the short circuit, that is, while detecting the time interval between the start of the current pulse cycle and the time when the short circuit occurs, also calculate the short circuit occurrence time t', after the end of this cycle, the values ​​of t and t' are reset to zero, and the timing of t and t' for the next cycle is performed.

[0054] According to the duration of the short circuit and the short circuit occurrence in the previous pulse cycle, the adjustment amount of the pulse waveform of the welding current in the next pulse cycle is determined. In the specific implementation, it is divided into three situations, including:

[0055] If the short circuit condition of the previous pulse cycle is a short circuit, adjust the peak value, base value and cycle value of the pulse welding current of the next pulse cycle according to the following formula:

[0056] I′ P =I P -A2[1-t / (t1+t2+t3)]

[0057] I′ b =I b -B2[1-t / (t1+t2+t3)]

[0058] T′=T-K2[1-t / (t1+t2+t3)]

[0059] Among them, I′ P Represents the peak value of the pulse welding current of the next pulse cycle, A; I P represents the peak value of the pulse welding current in the current pulse cycle, A; A2 represents the second adjustment coefficient of the pulse peak value, with a value range of 30 to 500; t represents the time interval between the start of the current pulse cycle and the time when the short circuit occurs, s; t1 represents the pulse rise time of the pulse welding current in the current pulse cycle, s; t2 represents the peak time of the pulse welding current in the current pulse cycle, s; t3 represents the pulse fall time of the pulse welding current in the current pulse cycle, s; I′ b Represents the base value of the pulse welding current for the next pulse cycle, A; I b A represents the base value of the pulse welding current in the current pulse cycle; B2 represents the second adjustment coefficient of the pulse base value, ranging from 20 to 80; T′ represents the cycle value of the pulse welding current in the next pulse cycle, s; T represents the cycle value of the pulse welding current in the current pulse cycle, s; K2 represents the second adjustment coefficient of the pulse cycle, ranging from 1 to 10.

[0060] Among them, the adjustment coefficients will be different for different shielding gases, welding wires of different materials and welding wires of different diameters. In specific implementation, the values ​​of the above three coefficients for each welding are determined through multiple tests.

[0061] If the short circuit condition of the previous pulse cycle is that there is no short circuit, and the short circuit duration is greater than the preset threshold, the peak value, base value and cycle value of the pulse welding current of the next pulse cycle are adjusted according to the following formula:

[0062] I′ P =I P +A3[t / (t1+t2+t3)]

[0063] I′ b =I b +B3[t / (t1+t2+t3)]

[0064] T′=T+K3[t / (t1+t2+t3)]

[0065] Among them, I′ P Represents the peak value of the pulse welding current of the next pulse cycle, A; I P represents the peak value of the pulse welding current in the current pulse cycle, A; A3 represents the third adjustment coefficient of the pulse peak value, ranging from 30 to 500; t represents the time interval between the start of the current pulse cycle and the time when the short circuit occurs; t1 represents the pulse rise time of the pulse welding current in the current pulse cycle, s; t2 represents the peak time of the pulse welding current in the current pulse cycle, s; t3 represents the pulse fall time of the pulse welding current in the current pulse cycle, s; I′ b Represents the base value of the pulse welding current for the next pulse cycle, A; I b A represents the base value of the pulse welding current in the current pulse cycle; B3 represents the third adjustment coefficient of the pulse base value, ranging from 20 to 80; T′ represents the cycle value of the pulse welding current in the next pulse cycle, s; T represents the cycle value of the pulse welding current in the current pulse cycle, s; K3 represents the third adjustment coefficient of the pulse cycle, ranging from 1 to 10.

[0066] Among them, the adjustment coefficients will be different for different shielding gases, welding wires of different materials and welding wires of different diameters. In specific implementation, the values ​​of the above three coefficients for each welding are determined through multiple tests.

[0067] If the short circuit condition of the previous pulse cycle is that no short circuit occurs, and the short circuit duration is less than or equal to the preset threshold, the peak value, base value and cycle value of the pulse welding current of the next pulse cycle are adjusted according to the following formula:

[0068] I′ P =I P-A2[1 - t / (t1 + t2 + t3)]

[0069] I′ b = I b -B2[1 - t / (t1 + t2 + t3)]

[0070] T′ = T - K2[1 - t / (t1 + t2 + t3)]

[0071] Wherein, I′ P represents the peak value of the pulsed welding current in the next pulse period, A; I P represents the peak value of the pulsed welding current in the current pulse period, A; A2 represents the second adjustment coefficient of the pulse peak value, and the value range is 30 - 500; t represents the time interval between the start time of the current pulse period and the short - circuit occurrence time, s; t1 represents the pulse rising duration of the pulsed welding current in the current pulse period, s; t2 represents the peak duration of the pulsed welding current in the current pulse period, s; t3 represents the pulse falling duration of the pulsed welding current in the current pulse period, s; I′ b represents the base value of the pulsed welding current in the next pulse period, A; I b represents the base value of the pulsed welding current in the current pulse period, A; B2 represents the second adjustment coefficient of the pulse base value, and the value range is 20 - 80; T′ represents the cycle value of the pulsed welding current in the next pulse period, s; T represents the cycle value of the pulsed welding current in the current pulse period, s; K2 represents the second adjustment coefficient of the pulse cycle, and the value range is 1 - 10.

[0072] Wherein, for different shielding gases, different materials of welding wires and different diameters of welding wires, the adjustment coefficients will be different. During specific implementation, the values of the above three coefficients for each welding are determined through multiple tests.

[0073] Wherein, the above - mentioned preset threshold is set based on the data obtained from long - term observation of droplet transfer during welding by high - speed photography and statistical analysis of the data. In a specific embodiment, the preset threshold can be set to 3 milliseconds.

[0074] As Figure 4 shown, it is a flowchart for pulsed welding control in a specific example of the present invention. The specific process includes:

[0075] First, the welding machine reads the pulse parameters for welding and monitors whether a short - circuit occurs during this pulse period. If no short - circuit occurs, continue welding in the next period according to the originally set pulse parameters.

[0076] If a short - circuit occurs, determine the position where the droplet detaches within this period. If it is at the rear, that is, t1 + t2 + t3 < t < T, adjust according to Scheme 1. The adjustment amount formula of Scheme 1 is:

[0077] I′ P =I P +A1[1-t / (t1+t2+t3)]

[0078] I′ b =I b +B1[1-t / (t1+t2+t3)]

[0079] T′=T+K1[1-t / (t1+t2+t3)]

[0080] If it is closer, that is, t<t1+t2+t3, then determine whether a short circuit occurred in the previous pulse cycle. If so, adjust according to Scheme 2, where the adjustment amount formula of Scheme 2 is:

[0081] I′ P =I P -A2[1-t / (t1+t2+t3)]

[0082] I′ b =I b -B2[1-t / (t1+t2+t3)]

[0083] T′=T-K2[1-t / (t1+t2+t3)]

[0084] If no short circuit occurs, determine whether the short circuit time t' in the current cycle is greater than 3ms. If less than or equal to 3ms, adjust according to Scheme 2; if greater than 3ms, adjust according to Scheme 3. The adjustment amount formula of Scheme 3 is:

[0085] I′ P =I P +A3[t / (t1+t2+t3)]

[0086] I′ b =I b +B3[t / (t1+t2+t3)]

[0087] T′=T+K3[t / (t1+t2+t3)]

[0088] After adjusting the relevant parameters according to the corresponding adjustment amount, welding is performed according to the adjusted parameters in the next pulse cycle, and each cycle is adjusted in this way until the welding is completed.

[0089] The present invention adjusts the pulse peak value, pulse base value and period, but those skilled in the art will understand that, due to the difference in welding materials, in a specific embodiment, waveform-related parameters such as pulse peak time, rising slope and falling slope can also be adjusted on this basis, which are all included in the protection scope of the present invention.

[0090] According to Figure 4 The adjustment shown can make the welding process stable, better ensure the droplet transition state of one pulse and one drop, and achieve good welding effect.

[0091] Based on the same inventive concept, the embodiment of the present invention also provides a pulse welding control device, the principles of solving the problems are similar, and the repeated parts are not repeated. The specific structure is as follows: Figure 5 As shown, including:

[0092] The current parameter acquisition module 501 is used to acquire the pulse parameters of the pulse welding current in the current pulse cycle;

[0093] The short circuit determination module 502 is used to determine the time interval between the start time of the current pulse cycle and the time when the short circuit occurs when it is determined that the current pulse cycle has a short circuit;

[0094] The current adjustment module 503 is used to adjust the pulse waveform of the welding current in the next pulse cycle according to the pulse parameters and the time interval.

[0095] The pulse parameters include at least: pulse period, pulse rise time, peak time and pulse fall time.

[0096] In a specific embodiment, the current adjustment module 503 includes:

[0097] A short circuit location determination unit, used to determine the location where the short circuit occurs based on pulse parameters and time intervals;

[0098] The current adjustment unit is used to adjust the pulse waveform of the welding current of the next pulse cycle according to the location and duration of the short circuit.

[0099] In a specific implementation, the short circuit location determination unit is specifically used for:

[0100] If the time interval is greater than the sum of the pulse rise time, the peak time and the pulse fall time, and the time interval is less than the pulse period, the position where the short circuit occurs is determined to be the first position;

[0101] If the time interval is equal to the sum of the pulse rise time, the peak time and the pulse fall time, the location where the short circuit occurs is determined to be the second location;

[0102] If the time interval is less than the sum of the pulse rising time, the peak time and the pulse falling time, it is determined that the position where the short circuit occurs is the third position.

[0103] Accordingly, the current adjustment unit is specifically used for:

[0104] If the short circuit occurs at the first position, adjust the peak value, base value and cycle value of the pulse welding current of the next pulse cycle according to the following formula:

[0105] I′ P =I P +A1[1-t / (t1+t2+t3)]

[0106] I′ b =I b +B1[1-t / (t1+t2+t3)]

[0107] T′=T+K1[1-t / (t1+t2+t3)]

[0108] Among them, I′ P Represents the peak value of the pulse welding current in the next pulse cycle; I P represents the peak value of the pulse welding current in the current pulse cycle; A1 represents the first adjustment coefficient of the pulse peak value; t represents the time interval between the start of the current pulse cycle and the time when the short circuit occurs; t1 represents the pulse rise time of the pulse welding current in the current pulse cycle; t2 represents the peak time of the pulse welding current in the current pulse cycle; t3 represents the pulse fall time of the pulse welding current in the current pulse cycle; I′ b Represents the base value of the pulse welding current for the next pulse cycle; I b Represents the base value of the pulse welding current of the current pulse cycle; B1 represents the first adjustment coefficient of the pulse base value; T′ represents the cycle value of the pulse welding current of the next pulse cycle; T represents the cycle value of the pulse welding current of the current pulse cycle; K1 represents the first adjustment coefficient of the pulse cycle.

[0109] In one embodiment, the current adjustment unit is specifically used to: if the position where the short circuit occurs is the second position, control the pulse waveform of the welding current in the next pulse cycle to be the same as the pulse waveform of the welding current in the current pulse cycle.

[0110] In one embodiment, the current adjustment unit is specifically used for:

[0111] If the position where the short circuit occurs is the third position, the adjustment amount of the pulse waveform of the welding current in the next pulse cycle is determined according to the duration of the short circuit and the short circuit occurrence in the previous pulse cycle.

[0112] Specifically, the current adjustment unit is specifically used for:

[0113] If the short circuit condition of the previous pulse cycle is a short circuit, adjust the peak value, base value and cycle value of the pulse welding current of the next pulse cycle according to the following formula:

[0114] I′ P =I P -A2[1-t / (t1+t2+t3)]

[0115] I′ b =I b -B2[1-t / (t1+t2+t3)]

[0116] T′=T-K2[1-t / (t1+t2+t3)]

[0117] Among them, I′ P Represents the peak value of the pulse welding current in the next pulse cycle; I P represents the peak value of the pulse welding current in the current pulse cycle; A2 represents the second adjustment coefficient of the pulse peak value; t represents the time interval between the start of the current pulse cycle and the time when the short circuit occurs; t1 represents the pulse rise time of the pulse welding current in the current pulse cycle; t2 represents the peak time of the pulse welding current in the current pulse cycle; t3 represents the pulse fall time of the pulse welding current in the current pulse cycle; I′ b Represents the base value of the pulse welding current for the next pulse cycle; I b Represents the base value of the pulse welding current of the current pulse cycle; B2 represents the second adjustment coefficient of the pulse base value; T′ represents the cycle value of the pulse welding current of the next pulse cycle; T represents the cycle value of the pulse welding current of the current pulse cycle; K2 represents the second adjustment coefficient of the pulse cycle.

[0118] The current adjustment unit is specifically used for:

[0119] If the short circuit condition of the previous pulse cycle is that there is no short circuit, and the short circuit duration is greater than the preset threshold, the peak value, base value and cycle value of the pulse welding current of the next pulse cycle are adjusted according to the following formula:

[0120] I′ P =I P +A3[t / (t1+t2+t3)]

[0121] I′ b =I b +B3[t / (t1+t2+t3)]

[0122] T′=T+K3[t / (t1+t2+t3)]

[0123] Among them, I′ P Represents the peak value of the pulse welding current in the next pulse cycle; I P represents the peak value of the pulse welding current in the current pulse cycle; A3 represents the third adjustment coefficient of the pulse peak value; t represents the time interval between the start of the current pulse cycle and the time when the short circuit occurs; t1 represents the pulse rise time of the pulse welding current in the current pulse cycle; t2 represents the peak time of the pulse welding current in the current pulse cycle; t3 represents the pulse fall time of the pulse welding current in the current pulse cycle; I′b Represents the base value of the pulse welding current for the next pulse cycle; I b Represents the base value of the pulse welding current of the current pulse cycle; B3 represents the third adjustment coefficient of the pulse base value; T′ represents the cycle value of the pulse welding current of the next pulse cycle; T represents the cycle value of the pulse welding current of the current pulse cycle; K3 represents the third adjustment coefficient of the pulse cycle.

[0124] The current adjustment unit is specifically used for:

[0125] If the short circuit condition of the previous pulse cycle is that no short circuit occurs, and the short circuit duration is less than or equal to the preset threshold, the peak value, base value and cycle value of the pulse welding current of the next pulse cycle are adjusted according to the following formula:

[0126] I′ P =I P -A2[1-t / (t1+t2+t3)]

[0127] I′ b =I b -B2[1-t / (t1+t2+t3)]

[0128] T′=T-K2[1-t / (t1+t2+t3)]

[0129] Among them, I′ P Represents the peak value of the pulse welding current in the next pulse cycle; I P represents the peak value of the pulse welding current in the current pulse cycle; A2 represents the second adjustment coefficient of the pulse peak value; t represents the time interval between the start of the current pulse cycle and the time when the short circuit occurs; t1 represents the pulse rise time of the pulse welding current in the current pulse cycle; t2 represents the peak time of the pulse welding current in the current pulse cycle; t3 represents the pulse fall time of the pulse welding current in the current pulse cycle; I′ b Represents the base value of the pulse welding current for the next pulse cycle; I b Represents the base value of the pulse welding current of the current pulse cycle; B2 represents the second adjustment coefficient of the pulse base value; T′ represents the cycle value of the pulse welding current of the next pulse cycle; T represents the cycle value of the pulse welding current of the current pulse cycle; K2 represents the second adjustment coefficient of the pulse cycle.

[0130] An embodiment of the present invention further provides a computer device, Figure 6 Schematic diagram of a computer device in an embodiment of the present invention. The computer device can implement all steps of the interactive processing method in the above embodiment. The computer device specifically includes the following contents:

[0131] Processor (processor) 601, memory (memory) 602, communication interface (CommunicationsInterface) 603 and communication bus 604;

[0132] The processor 601, the memory 602, and the communication interface 603 communicate with each other through the communication bus 604; the communication interface 603 is used to realize information transmission between related devices;

[0133] The processor 601 is used to call the computer program in the memory 602, and the pulse welding control method in the above embodiment is implemented when the processor executes the computer program.

[0134] In summary, the pulse welding control method and device provided in this specific embodiment have the following advantages:

[0135] By obtaining the pulse parameters of the pulse welding current of the current pulse cycle; when it is determined that a short circuit occurs in the current pulse cycle, the time interval between the start of the current pulse cycle and the time when the short circuit occurs is determined; according to the pulse parameters and the time interval, the pulse waveform of the welding current of the next pulse cycle is adjusted. By using the pulse parameters of the welding current of the current pulse cycle and the short circuit situation to adjust the pulse waveform of the welding current of the next pulse cycle, real-time adjustment is achieved after the short circuit occurs, thereby ensuring the stability of the droplet shedding moment in each pulse cycle, improving the stability of the welding process, and thus improving the welding effect.

[0136] Although the present invention provides method operation steps as described in the embodiments or flowcharts, more or fewer operation steps may be included based on conventional or non-creative labor. The order of steps listed in the embodiments is only one way of executing the order of many steps and does not represent the only execution order. When the actual device or client product is executed, it can be executed in sequence or in parallel according to the method shown in the embodiments or the drawings (for example, in a parallel processor or multi-threaded processing environment).

[0137] It should be understood by those skilled in the art that the embodiments of this specification may be provided as methods, devices (systems) or computer program products. Therefore, the embodiments of this specification may take the form of complete hardware embodiments, complete software embodiments or embodiments combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0138] The present invention is described with reference to flowcharts and / or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as a combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0139] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0140] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0141] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. In this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0142] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other. The present invention is not limited to any single aspect, nor to any single embodiment, nor to any combination and / or replacement of these aspects and / or embodiments. Moreover, each aspect and / or embodiment of the present invention may be used alone or in combination with one or more other aspects and / or embodiments thereof.

[0143] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A pulse welding control method, characterized in that: include: Obtain pulse parameters of the pulse welding current of the current pulse cycle; When it is determined that a short circuit occurs in the current pulse cycle, determining the time interval between the start time of the current pulse cycle and the time when the short circuit occurs; According to the pulse parameters and the time interval, adjusting the pulse waveform of the welding current in the next pulse cycle; The step of adjusting the pulse waveform of the welding current of the next pulse cycle according to the pulse parameter and the time interval comprises: Determining the location where the short circuit occurs according to the pulse parameters and the time interval; According to the location where the short circuit occurs, the pulse waveform of the welding current in the next pulse cycle is adjusted; Wherein, adjusting the pulse waveform of the welding current of the next pulse cycle according to the position where the short circuit occurs includes: If the short circuit occurs at the first position, adjust the peak value, base value and cycle value of the pulse welding current of the next pulse cycle according to the following formula: I′ P =I P +A1[1-t / (t1+t2+t3)] I′ b =I b +B1[1-t / (t1+t2+t3)] T′=T+K1[1-t / (t1+t2+t3)] Among them, I P ′ Represents the peak value of the pulse welding current in the next pulse cycle; I P represents the peak value of the pulse welding current in the current pulse cycle; A1 represents the first adjustment coefficient of the pulse peak value; t represents the time interval between the start of the current pulse cycle and the time when the short circuit occurs; t1 represents the pulse rise time of the pulse welding current in the current pulse cycle; t2 represents the peak value of the pulse welding current in the current pulse cycle; t3 represents the pulse fall time of the pulse welding current in the current pulse cycle; I b ′ Represents the base value of the pulse welding current for the next pulse cycle; I b represents the base value of the pulse welding current in the current pulse cycle; B1 represents the first adjustment coefficient of the pulse base value; T ′ represents the cycle value of the pulse welding current of the next pulse cycle; T represents the cycle value of the pulse welding current of the current pulse cycle; K1 represents the first adjustment coefficient of the pulse cycle.

2. The pulse welding control method according to claim 1, characterized in that: The pulse parameters include at least: pulse period, pulse rise time, peak time and pulse fall time; Determining a location where a short circuit occurs according to the pulse parameter and the time interval includes: If the time interval is greater than the sum of the pulse rise time, the peak time and the pulse fall time, and the time interval is less than the pulse period, the position where the short circuit occurs is determined to be the first position; If the time interval is equal to the sum of the pulse rise time, the peak time and the pulse fall time, the position where the short circuit occurs is determined to be the second position; If the time interval is less than the sum of the pulse rising time, the peak time and the pulse falling time, it is determined that the position where the short circuit occurs is the third position.

3. The pulse welding control method according to claim 2, characterized in that: According to the location of the short circuit, the pulse waveform of the welding current of the next pulse cycle is adjusted, including: If the position where the short circuit occurs is the second position, the pulse waveform of the welding current in the next pulse cycle is controlled to be the same as the pulse waveform of the welding current in the current pulse cycle.

4. The pulse welding control method according to claim 3, characterized in that: According to the location of the short circuit, the pulse waveform of the welding current of the next pulse cycle is adjusted, including: If the short circuit occurs at the third position, determine the duration of the short circuit; The adjustment amount of the pulse waveform of the welding current in the next pulse cycle is determined according to the short circuit occurrence duration and the short circuit occurrence condition in the previous pulse cycle.

5. The pulse welding control method according to claim 4, characterized in that: According to the short circuit occurrence duration and the short circuit occurrence condition of the previous pulse cycle, determining the adjustment amount of the pulse waveform of the welding current in the next pulse cycle includes: If the short circuit condition of the previous pulse cycle is a short circuit, adjust the peak value, base value and cycle value of the pulse welding current of the next pulse cycle according to the following formula: I′ P =I P -A2[1-t / (t1+t2+t3)] I′ b =I b -B2[1-t / (t1+t2+t3)] T′=T-K2[1-t / (t1+t2+t3)] Among them, I′ P Represents the peak value of the pulse welding current in the next pulse cycle; I P represents the peak value of the pulse welding current in the current pulse cycle; a2 represents the second adjustment coefficient of the pulse peak value; t represents the time interval between the start of the current pulse cycle and the time when the short circuit occurs; t1 represents the pulse rise time of the pulse welding current in the current pulse cycle; t2 represents the peak time of the pulse welding current in the current pulse cycle; t3 represents the pulse fall time of the pulse welding current in the current pulse cycle; I′ b Represents the base value of the pulse welding current for the next pulse cycle; I b represents the base value of the pulse welding current in the current pulse cycle; B2 represents the second adjustment coefficient of the pulse base value; T ′ represents the cycle value of the pulse welding current of the next pulse cycle; T represents the cycle value of the pulse welding current of the current pulse cycle; K2 represents the second adjustment coefficient of the pulse cycle.

6. The pulse welding control method according to claim 4, characterized in that: According to the short circuit occurrence duration and the short circuit occurrence condition of the previous pulse cycle, determining the adjustment amount of the pulse waveform of the welding current in the next pulse cycle includes: If the short circuit condition of the previous pulse cycle is that no short circuit occurs, and the short circuit duration is greater than the preset threshold, the peak value, base value and cycle value of the pulse welding current of the next pulse cycle are adjusted according to the following formula: I P ′ =I P +A3[t / (t1+t2+t3)] I′ b =I b +B3[t / (t1+t2+t3)] T ′ =T+K3[t / (t1+t2+t3)] Among them, I P ′ Represents the peak value of the pulse welding current in the next pulse cycle; I P represents the peak value of the pulse welding current in the current pulse cycle; A3 represents the third adjustment coefficient of the pulse peak value; t represents the time interval between the start of the current pulse cycle and the time when the short circuit occurs; t1 represents the pulse rise time of the pulse welding current in the current pulse cycle; t2 represents the peak time of the pulse welding current in the current pulse cycle; t3 represents the pulse fall time of the pulse welding current in the current pulse cycle; I′ b Represents the base value of the pulse welding current for the next pulse cycle; I b represents the base value of the pulse welding current in the current pulse cycle; B3 represents the third adjustment coefficient of the pulse base value; T ′ represents the cycle value of the pulse welding current of the next pulse cycle; T represents the cycle value of the pulse welding current of the current pulse cycle; K3 represents the third adjustment coefficient of the pulse cycle.

7. The pulse welding control method according to claim 4, characterized in that: According to the short circuit occurrence duration and the short circuit occurrence condition of the previous pulse cycle, determining the adjustment amount of the pulse waveform of the welding current in the next pulse cycle includes: If the short circuit condition of the previous pulse cycle is that no short circuit occurs, and the short circuit duration is less than or equal to the preset threshold, the peak value, base value and cycle value of the pulse welding current of the next pulse cycle are adjusted according to the following formula: I P ′ =I P -A2[1-t / (t1+t2+t3)] I′ b =I b -B2[1-t / (t1+t2+t3)] T ′ =T-K2[1-t / (t1+t2+t3)] Among them, I′ P Represents the peak value of the pulse welding current in the next pulse cycle; I P represents the peak value of the pulse welding current in the current pulse cycle; A2 represents the second adjustment coefficient of the pulse peak value; t represents the time interval between the start of the current pulse cycle and the time when the short circuit occurs; t1 represents the pulse rise time of the pulse welding current in the current pulse cycle; t2 represents the peak value of the pulse welding current in the current pulse cycle; t3 represents the pulse fall time of the pulse welding current in the current pulse cycle; I b ′ Represents the base value of the pulse welding current for the next pulse cycle; I b represents the base value of the pulse welding current in the current pulse cycle; B2 represents the second adjustment coefficient of the pulse base value; T ′ represents the cycle value of the pulse welding current of the next pulse cycle; T represents the cycle value of the pulse welding current of the current pulse cycle; K2 represents the second adjustment coefficient of the pulse cycle.

8. A pulse welding control device, characterized in that: include: A current parameter acquisition module is used to obtain the pulse parameters of the pulse welding current in the current pulse cycle; A short circuit determination module, used to determine the time interval between the start time of the current pulse cycle and the time when the short circuit occurs when it is determined that the current pulse cycle has a short circuit; A current adjustment module, used for adjusting the pulse waveform of the welding current of the next pulse cycle according to the pulse parameters and the time interval; The current adjustment module is used to adjust the pulse waveform of the welding current of the next pulse cycle according to the pulse parameters and the time interval, including: the current adjustment module is used to: Determining the location where the short circuit occurs according to the pulse parameters and the time interval; According to the location where the short circuit occurs, the pulse waveform of the welding current in the next pulse cycle is adjusted; The current adjustment module is used to adjust the pulse waveform of the welding current in the next pulse cycle according to the location where the short circuit occurs, including: the current adjustment module is used to: If the short circuit occurs at the first position, adjust the peak value, base value and cycle value of the pulse welding current of the next pulse cycle according to the following formula: I′ P =I P +A1[1-t / (t1+t2+t3)] I b ′ =I b +B1[1-t / (t1+t2+t3)] T ′ =T+K1[1-t / (t1+t2+t3)] Among them, I P ′ Represents the peak value of the pulse welding current in the next pulse cycle; I P represents the peak value of the pulse welding current in the current pulse cycle; A1 represents the first adjustment coefficient of the pulse peak value; t represents the time interval between the start of the current pulse cycle and the time when the short circuit occurs; t1 represents the pulse rise time of the pulse welding current in the current pulse cycle; t2 represents the peak value of the pulse welding current in the current pulse cycle; t3 represents the pulse fall time of the pulse welding current in the current pulse cycle; I b ′ Represents the base value of the pulse welding current for the next pulse cycle; I b represents the base value of the pulse welding current in the current pulse cycle; B1 represents the first adjustment coefficient of the pulse base value; T ′ represents the cycle value of the pulse welding current of the next pulse cycle; T represents the cycle value of the pulse welding current of the current pulse cycle; K1 represents the first adjustment coefficient of the pulse cycle.

9. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the pulse welding control method according to any one of claims 1 to 7 is implemented.

Images