Electric arc control method for drawing wire welding under abnormal voltage

Abstract

The invention discloses an electric arc control method for drawing and wire welding under abnormal voltage, which belongs to the technical field of welding, and comprises the following steps of: starting from an arcing detection moment, acquiring an actual voltage value and calculating a voltage change rate; according to comparison results of the voltage change rate and the actual voltage value with relevant set values, whether the current stage is an arcing stage or not is judged; in the arcing stage, according to comparison results of the voltage change rate, the actual voltage value and the short-circuit duration with related set values, whether tiny short circuit occurs in the arcing stage or not is judged; and according to the comparison result of the voltage change rate and the related set value and the comparison result of the actual voltage value and the related set value or the peak voltage average value, whether abnormal voltage occurs in the arcing stage or not is judged, and therefore corresponding welding parameters are generated. When tiny short circuit and abnormal voltage occur, the arc length stability is guaranteed by controlling the positive wire feeding speed, the wire feeding delay time after short circuit detection and the negative wire drawing speed.

Description

Technical Field

[0001] The invention relates to an arc control method for wire drawing welding under abnormal voltage, belonging to the technical field of welding. Background Art

[0002] With the development and progress of welding technology and automated welding equipment, users have higher and higher requirements for welding quality and welding efficiency, resulting in the rapid development of wire drawing welding technology in recent years. In the wire drawing welding process, positive and negative wire drawing are performed alternately to achieve the effect of periodic output in the short circuit stage and arc burning stage. The consistency and stability of the output time in the short circuit stage and arc burning stage will directly affect the arc length, and then affect the welding effect.

[0003] Based on this, the wire feeding system of the existing welding control technology can ensure the arc length consistency and the voltage addition and subtraction functions during the welding process under the condition of good wire feeding effect; however, when the welding parameters or current parameters are not properly matched, or after a long period of welding, the wire feeding wheel is severely worn, and the wire feeding effect is poor due to some other conditions, some small short circuits or abnormal voltages often occur, resulting in abnormal transition of the next molten droplet, thereby affecting the actual welding effect; although the existing technology has improved the detection and processing of small short circuits and abnormal voltages during pulse and short-circuit welding, there is still no processing technology for small short circuits or abnormal voltages during wire drawing welding; therefore, how to effectively reduce or eliminate the influence of small short circuits or abnormal voltages in wire drawing welding on welding performance has become a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0004] Purpose of the invention: The present invention provides an arc control method for wire drawing welding under abnormal voltage, which can solve the shortcomings of the prior art. In view of the small short circuit and abnormal voltage during pulse and short circuit welding, the wire feeding system is improved and controlled accordingly, so that its welding parameters are matched with the real-time current and voltage, thereby ensuring the stability of the arc length during welding.

[0005] In order to solve the above technical problems, the present invention is implemented by adopting the following technical solutions.

[0006] In a first aspect, the present invention provides an arc control method for wire drawing welding under abnormal voltage, comprising:

[0007] From the moment of arc detection, obtain the actual voltage value and the peak voltage value within the set time before each peak current output ends;

[0008] Calculate the current voltage change rate based on the current actual voltage value and the previous actual voltage value;

[0009] The peak voltage value within the set time before each peak current output ends is averaged, and the average value of the peak voltage within the set time before the corresponding peak current output ends is obtained and dynamically updated as the arc detection cycle changes;

[0010] According to the comparison result between the current voltage change rate and the change rate setting value and the current actual voltage value and the voltage setting value, it is judged whether the current stage is the arcing stage or the short circuit stage;

[0011] In the arcing stage, whether a small short circuit occurs in the arcing stage is determined based on the comparison results between the real-time voltage change rate and the change rate setting value, the actual voltage value and the voltage setting value, and the short circuit duration and the short circuit duration setting value;

[0012] In the arcing stage, according to the comparison result of the real-time voltage change rate and the change rate setting value and the actual voltage value and the voltage setting value, or the comparison result of the real-time voltage change rate and the change rate setting value and the average value of the peak voltage and the actual voltage value, it is judged whether abnormal voltage occurs in the arcing stage;

[0013] When a small short circuit or voltage anomaly occurs, the corresponding welding parameters are generated to control the positive wire feeding speed, the wire feeding delay time after normal short circuit detection, and the negative wire drawing speed.

[0014] Optionally, starting from the moment of arc detection, the actual voltage value and the peak voltage value within a set time before the end of each peak current output are obtained, including:

[0015] From the moment of each arc detection, the actual voltage value V is obtained in real time at a fixed time interval;

[0016] Record the peak voltage value within 200us before the end of the peak current output.

[0017] Optionally, the current voltage change rate is calculated based on the current actual voltage value and the previous actual voltage value, including:

[0018] Calculate the difference between the actual voltage value obtained in the previous time interval and the current actual voltage value to obtain the current voltage change;

[0019] The current voltage change rate is calculated based on the current voltage change and the time interval.

[0020] Optionally, judging whether the current state is an arcing stage or a short circuit stage based on a comparison result between the current voltage change rate and the change rate setting value and the current actual voltage value and the voltage setting value includes:

[0021] If the current voltage change rate is less than or equal to the first set value of the change rate, and the current actual voltage value is less than or equal to the first set value of the voltage, then the current welding stage is the short circuit stage;

[0022] If the current voltage change rate is greater than or equal to the second set value of the change rate, and the actual voltage value is greater than or equal to the second set value of the voltage, then the current welding stage is the arcing stage.

[0023] Optionally, during the arcing stage, judging whether a small short circuit occurs during the arcing stage is performed based on the comparison results of the real-time voltage change rate and the change rate setting value, the actual voltage value and the voltage setting value, and the short circuit duration and the short circuit duration setting value, including:

[0024] During the arcing stage, if the real-time voltage change rate is less than or equal to the first set value of the change rate, the actual voltage value is less than or equal to the first set value of the voltage, and the short circuit duration is less than the short circuit duration setting value, a small short circuit occurs during the arcing stage.

[0025] Optionally, in the arcing stage, judging whether abnormal voltage occurs in the arcing stage according to the comparison result of the real-time voltage change rate with the change rate setting value and the actual voltage value with the voltage setting value, or the comparison result of the real-time voltage change rate with the change rate setting value and the average value of the peak voltage with the actual voltage value, includes:

[0026] During the arcing stage, if the real-time voltage change rate is greater than or equal to the third setting value of the change rate, and the actual voltage value is greater than or equal to the third setting value of the voltage, or the real-time voltage change rate is greater than or equal to the third setting value of the change rate, and the actual voltage value is greater than or equal to the average value of the current peak voltage, then abnormal voltage occurs during the arcing stage.

[0027] Optionally, when a minor short circuit occurs, corresponding welding parameters are generated to control the positive wire feeding speed, the wire feeding delay time after a normal short circuit is detected, and the negative wire drawing speed, including:

[0028] Respectively obtain the start time of the micro short circuit and the start time of the corresponding arcing stage;

[0029] Calculate the start time of the micro short circuit and the start time of the corresponding arc burning stage to obtain the time difference between the micro short circuit and the corresponding arc burning stage;

[0030] If the occurrence time of the micro short circuit is within a specific time period of the arcing stage, the first adjustment strategy is used to generate welding parameters for the next arcing stage, and the positive wire feeding speed, the wire feeding delay time after the normal short circuit is detected, and the negative wire drawing speed are controlled in the next arcing stage;

[0031] If the occurrence time of the micro short circuit is outside the specific time period of the arcing stage, the second adjustment strategy is used to generate the welding parameters of the next arcing stage to control the positive wire feeding speed of the next arcing stage, the wire feeding delay time after the normal short circuit detection and the negative wire drawing speed.

[0032] Optionally, the first adjustment strategy is used to generate welding parameters for the next arcing stage, and the positive wire feeding speed, the wire feeding delay time after the normal short circuit detection, and the negative wire drawing speed in the next arcing stage are controlled, including:

[0033] After the next arcing stage, the first adjustment strategy is adopted to reduce the positive wire feeding speed, reduce the wire feeding delay time after the normal short circuit detection and increase the negative wire withdrawal speed;

[0034] Among them, the expression of the first adjustment strategy to reduce the forward wire feeding speed is:

[0035]

[0036] In the formula, is the forward wire feeding speed after the first adjustment strategy is reduced, is the original forward wire feeding speed, It is the time interval between the occurrence of a small short circuit and the detection of the corresponding arc. Set the duration for the arc, is the forward wire feeding speed variable of the first adjustment strategy;

[0037] The expression of the first adjustment strategy to reduce the wire feeding delay time after normal short circuit detection is:

[0038]

[0039] In the formula, It is the wire feeding delay time after the normal short circuit detection after the first adjustment strategy is adjusted. is the original wire feeding delay time, is the wire feeding delay time variable of the first adjustment strategy;

[0040] The expression of the first adjustment strategy to increase the negative wire retraction speed is:

[0041]

[0042] In the formula, is the negative wire retraction speed after the first adjustment strategy is increased, is the original negative wire retraction speed, It is the negative wire retraction speed variable of the first adjustment strategy.

[0043] Optionally, a second adjustment strategy is used to generate welding parameters for the next arcing stage, to control the positive wire feeding speed, the wire feeding delay time after normal short circuit detection, and the negative wire drawing speed for the next arcing stage, including:

[0044] After the next arcing stage, the second adjustment strategy is adopted to increase the positive wire feeding speed, reduce the wire feeding delay time after the normal short circuit detection, and increase the negative wire withdrawal speed;

[0045] Among them, the expression of the second adjustment strategy increasing the forward wire feeding speed and decreasing the forward wire feeding speed is:

[0046]

[0047] In the formula, is the forward wire feeding speed after the second adjustment strategy is reduced, is the original forward wire feeding speed, It is the time interval between the occurrence of a small short circuit and the detection of the corresponding arc. Set the duration for the arc, is the forward wire feeding speed variable of the second adjustment strategy;

[0048] The expression of the second adjustment strategy to reduce the wire feeding delay time after normal short circuit detection is:

[0049]

[0050] In the formula, It is the wire feeding delay time after normal short circuit detection after adjustment by the second adjustment strategy. is the original wire feeding delay time, is the wire feeding delay time variable of the second adjustment strategy;

[0051] The expression of the second adjustment strategy to increase the negative wire retraction speed is:

[0052]

[0053] In the formula, is the negative wire retraction speed after the second adjustment strategy increases, is the original negative wire retraction speed, It is the negative wire retraction speed variable of the second adjustment strategy.

[0054] Optionally, when voltage anomaly occurs, corresponding welding parameters are generated to control the positive wire feeding speed, the wire feeding delay time after normal short circuit detection, and the negative wire drawing speed in real time, including:

[0055] Adopt abnormal voltage control strategy to generate welding parameters in the current arcing stage, reduce the current positive wire feeding speed, reduce the wire feeding delay time after normal short circuit detection and increase the current negative wire drawing speed;

[0056] Among them, the expression of abnormal voltage control strategy to reduce the current forward wire feeding speed is:

[0057]

[0058] In the formula, is the current forward wire feeding speed after the abnormal voltage control strategy is reduced, is the original forward wire feeding speed, is the forward wire feeding speed variable of the abnormal voltage control strategy;

[0059] The expression of abnormal voltage control strategy to reduce wire feeding delay time after normal short circuit detection is:

[0060]

[0061] In the formula, is the wire feeding delay time after normal short circuit detection after abnormal voltage control strategy is reduced, is the original wire feeding delay time, is the wire feeding delay time variable of the abnormal voltage control strategy;

[0062] The expression of abnormal voltage control strategy to increase the current negative wire drawing speed is:

[0063]

[0064] In the formula, The current negative wire drawing speed is increased by using the abnormal voltage control strategy. is the original negative wire retraction speed, It is the negative wire retraction speed variable of abnormal voltage control strategy.

[0065] Compared with the prior art, the present invention has the following beneficial effects:

[0066] 1. During the welding process, the present invention detects the voltage value, voltage change rate, duration of the short circuit stage, and duration of the arcing stage in real time from each arcing detection moment to classify and judge the small short circuit and abnormal voltage, and adopts different control strategies to match the welding parameters with the real-time current and voltage, ensuring the consistency and stability of the short circuit and arcing stage outputs in the current and next cycles, thereby ensuring the stability of the arc.

[0067] 2. The stages of micro-short circuits during welding are classified and refined, and corresponding control strategies are adopted to generate corresponding welding parameters in a refined manner. When the short circuit stage and the arcing stage alternate, the positive wire feeding speed, the wire feeding delay time after the normal short circuit detection, and the negative wire drawing speed are controlled in real time to stabilize the alternating state and effectively reduce or eliminate the continuous impact of micro-short circuits or abnormal voltages on wire drawing welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 It is a flow chart of the arc control method of wire drawing welding under abnormal voltage of the present invention;

[0069] Figure 2 Shown is a diagram of an embodiment of the present invention in which a small short circuit occurs during the arcing stage;

[0070] Figure 3 The second embodiment of the present invention is shown in which a small short circuit occurs during the arcing stage;

[0071] Figure 4 Shown is a diagram of an embodiment of abnormal voltage occurring during the arcing stage of the present invention. DETAILED DESCRIPTION

[0072] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0073] During the wire drawing welding process, abnormal voltage may lead to two situations that affect the welding effect: (1) abnormal voltage may be generated when the arc is ignited after a small short circuit occurs; (2) abnormal voltage may occur suddenly during the arcing process; therefore, it is very necessary to identify abnormal voltage in wire drawing welding, and there are many factors that lead to abnormal voltage. The applicant has found that especially when the welding parameters or current parameters are not properly matched, or after a long period of welding, the wire feed wheel is severely worn, and the wire feeding effect is poor due to other reasons, some small short circuits or abnormal voltages often occur, which leads to abnormal transition of the next molten droplet, thereby affecting the actual welding effect. There is no solution to this problem in the prior art. Therefore, in order to reduce or eliminate the influence of small short circuits or abnormal voltages on welding performance in wire drawing welding, the applicant introduces a new arc control method to ensure the stability of the arc length.

[0074] Example 1

[0075] This embodiment provides an arc control method for wire drawing welding under abnormal voltage, such as Figure 1 Shown include:

[0076] Step 1: From the moment of arc detection, obtain the actual voltage value and the peak voltage value within the set time before each peak current output ends;

[0077] Step 2: Calculate the current voltage change rate based on the current actual voltage value and the previous actual voltage value; calculate the average value of the peak voltage value within the set time before each peak current output ends, and obtain the average value of the peak voltage within the set time before the corresponding peak current output ends, and dynamically update it with the periodic changes of arc detection;

[0078] Step 3: According to the comparison result between the current voltage change rate and the change rate setting value and the current actual voltage value and the voltage setting value, it is determined whether the current state is the arcing stage or the short circuit stage;

[0079] Step 4: During the arcing stage, judging whether a small short circuit occurs during the arcing stage according to the comparison results of the real-time voltage change rate and the change rate setting value, the actual voltage value and the voltage setting value, and the short circuit duration and the short circuit duration setting value;

[0080] Step 5, in the arcing stage, according to the comparison result of the real-time voltage change rate and the change rate setting value and the actual voltage value and the voltage setting value, or the comparison result of the real-time voltage change rate and the change rate setting value and the average value of the peak voltage and the actual voltage value, whether abnormal voltage occurs in the arcing stage;

[0081] Step 6: When a small short circuit or voltage abnormality occurs, generate corresponding welding parameters to control the positive wire feeding speed, the wire feeding delay time after normal short circuit detection, and the negative wire drawing speed.

[0082] Optionally, in step 1, starting from the moment of arc detection, the actual voltage value and the peak voltage value within a set time before each peak current output ends are obtained, including:

[0083] From the moment of each arc detection, the actual voltage value V is obtained in real time at a fixed time interval;

[0084] Record the peak voltage value within 200us before the end of the peak current output;

[0085] like Figure 2 As shown, this embodiment collects the actual voltage value V in real time every 12.5 us starting from each arc detection moment.

[0086] Optionally, in step 2, the current voltage change rate is calculated according to the current actual voltage value and the previous actual voltage value, including:

[0087] Calculate the difference between the actual voltage value obtained in the previous time interval and the current actual voltage value to obtain the current voltage change;

[0088] The current voltage change rate is calculated based on the current voltage change and the time interval.

[0089] This embodiment obtains the actual voltage value and synchronously calculates the dv / dt voltage change rate; at the same time, calculates the average value IPV of the peak voltage within 200us before the end of IPA output.

[0090] Optionally, this embodiment presets multiple voltage change rate setting values and multiple voltage setting values, including: the first voltage change rate setting value K0, the second voltage change rate setting value K1, the third voltage change rate setting value K2, the first voltage setting value V0, the second voltage setting value V1, and the third voltage setting value Vc; where, the first voltage setting value V0 < the second voltage setting value V1 < the third voltage setting value Vc; the first change rate setting value K0 < the second change rate setting value K1 < the third change rate setting value K2. As Figure 2 and Figure 3 shown, in step 3, according to the comparison results of the current voltage change rate with the change rate setting value and the current actual voltage value with the voltage setting value, it is judged whether the current is in the arcing stage or the short - circuit stage, including:

[0091] If the current voltage change rate is less than or equal to the first change rate setting value, and the current actual voltage value is less than or equal to the first voltage setting value, that is, when dv / dt ≤ K0 and V ≤ V0, then the current welding stage is the short - circuit stage;

[0092] If the current voltage change rate is greater than or equal to the second change rate setting value, and the actual voltage value is greater than or equal to the second voltage setting value, that is, when dv / dt ≥ K1 and V ≥ V1, then the current welding stage is the arcing stage;

[0093] During the drawing - wire welding process, the arcing stage and the short - circuit stage alternate. In step 4, during the arcing stage, according to the comparison results of the real - time voltage change rate with the change rate setting value, the actual voltage value with the voltage setting value, and the short - circuit duration with the short - circuit duration setting value, it is judged whether a minor short - circuit occurs in the arcing stage, including:

[0094] During the arcing stage, if there is a real - time voltage change rate less than or equal to the first change rate setting value, the actual voltage value less than or equal to the first voltage setting value, and the short - circuit duration less than the short - circuit duration setting value, that is, when dv / dt ≤ K0, V ≤ V0, and Ts < T1, then a minor short - circuit occurs in the arcing stage;

[0095] In the case where no minor short - circuit occurs during the arcing stage, there may still be a sudden abnormal voltage, and the abnormal voltage is also an important reason for the unstable arc length.

[0096] Optionally, during the arcing stage, as Figure 4 shown, according to the comparison results of the real - time voltage change rate with the change rate setting value and the actual voltage value with the voltage setting value, or the comparison results of the real - time voltage change rate with the change rate setting value and the average value of the peak voltage with the actual voltage value, it is judged whether an abnormal voltage occurs in the arcing stage, including:

[0097] During the arcing stage, if the real-time voltage change rate is greater than or equal to the third setting value of the change rate, and the actual voltage value is greater than or equal to the third setting value of the voltage, or the real-time voltage change rate is greater than or equal to the third setting value of the change rate, and the actual voltage value is greater than or equal to the average value of the current peak voltage, that is, dv / dt≥K2 and V≥Vc or dv / dt≥K2 and V≥IPV, then abnormal voltage occurs during the arcing stage.

[0098] Optional, such as Figure 2 and Figure 3 As shown, in step 6, when a small short circuit occurs, corresponding welding parameters are generated to control the positive wire feeding speed, the wire feeding delay time after the normal short circuit is detected, and the negative wire drawing speed, including:

[0099] Respectively obtain the start time of the micro short circuit and the start time of the corresponding arcing stage;

[0100] Calculate the start time of the micro short circuit and the start time of the corresponding arc burning stage to obtain the time difference between the micro short circuit and the corresponding arc burning stage;

[0101] If the occurrence time of the micro short circuit is within a specific time period of the arcing stage, the first adjustment strategy is used to generate the welding parameters of the next arcing stage, and the positive wire feeding speed, the wire feeding delay time after the normal short circuit detection and the negative wire drawing speed of the next arcing stage are controlled; when the arc is to be ignited, the positive wire feeding speed is reduced, the wire feeding delay time after the normal short circuit detection is reduced, and the negative wire drawing speed is increased;

[0102] If the occurrence time of the micro-short circuit is outside the specific time period of the arcing stage, the second adjustment strategy is used to generate the welding parameters of the next arcing stage to control the forward wire feeding speed, the wire feeding delay time after the normal short circuit detection and the negative wire drawing speed of the next arcing stage; when the arc is burning, the forward wire feeding speed is increased, the wire feeding delay time after the normal short circuit detection is reduced, and the negative wire withdrawal speed is increased.

[0103] Optionally, the first adjustment strategy is used to generate welding parameters for the next arcing stage, and the positive wire feeding speed, the wire feeding delay time after the normal short circuit detection, and the negative wire drawing speed in the next arcing stage are controlled, including:

[0104] In the next arcing stage, the first adjustment strategy is adopted to reduce the positive wire feeding speed, reduce the wire feeding delay time after the normal short circuit detection, and increase the negative wire withdrawal speed;

[0105] Among them, the expression of the first adjustment strategy to reduce the forward wire feeding speed is:

[0106]

[0107] In the formula, is the forward wire feeding speed after the first adjustment strategy is reduced, is the original forward wire feeding speed, It is the time interval between the occurrence of a small short circuit and the detection of the corresponding arc. Set the duration for the arc, is the forward wire feeding speed variable of the first adjustment strategy;

[0108] The expression of the first adjustment strategy to reduce the wire feeding delay time after normal short circuit detection is:

[0109]

[0110] In the formula, It is the wire feeding delay time after the normal short circuit detection after the first adjustment strategy is adjusted. is the original wire feeding delay time, is the wire feeding delay time variable of the first adjustment strategy;

[0111] The expression of the first adjustment strategy to increase the negative wire retraction speed is:

[0112]

[0113] In the formula, is the negative wire retraction speed after the first adjustment strategy is increased, is the original negative wire retraction speed, It is the negative wire retraction speed variable of the first adjustment strategy.

[0114] Optionally, a second adjustment strategy is used to generate welding parameters for the next arcing stage, to control the positive wire feeding speed, the wire feeding delay time after normal short circuit detection, and the negative wire drawing speed for the next arcing stage, including:

[0115] In the next arcing stage, the second adjustment strategy is adopted to increase the positive wire feeding speed, reduce the wire feeding delay time after the normal short circuit detection, and increase the negative wire withdrawal speed;

[0116] Among them, the expression of the second adjustment strategy increasing the forward wire feeding speed and decreasing the forward wire feeding speed is:

[0117]

[0118] In the formula, is the forward wire feeding speed after the second adjustment strategy is reduced, is the original forward wire feeding speed, It is the time interval between the occurrence of a small short circuit and the detection of the corresponding arc. Set the duration for the arc, is the forward wire feeding speed variable of the second adjustment strategy;

[0119] The expression of the second adjustment strategy to reduce the wire feeding delay time after normal short circuit detection is:

[0120]

[0121] In the formula, It is the wire feeding delay time after normal short circuit detection after adjustment by the second adjustment strategy. is the original wire feeding delay time, is the wire feeding delay time variable of the second adjustment strategy;

[0122] The expression of the second adjustment strategy to increase the negative wire retraction speed is:

[0123]

[0124] In the formula, is the negative wire retraction speed after the second adjustment strategy increases, is the original negative wire retraction speed, It is the negative wire retraction speed variable of the second adjustment strategy.

[0125] Optional, such as Figure 4 As shown, in step 6, when a voltage abnormality occurs, corresponding welding parameters are generated to control the positive wire feeding speed, the wire feeding delay time after normal short circuit detection, and the negative wire drawing speed in real time, including:

[0126] Adopt abnormal voltage control strategy to generate welding parameters in the current arcing stage, reduce the current positive wire feeding speed, reduce the wire feeding delay time after normal short circuit detection and increase the current negative wire drawing speed;

[0127] In this embodiment, when abnormal voltage occurs but no short circuit occurs during wire drawing welding, the forward wire feeding speed is reduced from S1 by △S111, the wire feeding delay time after normal short circuit detection is reduced by △T111 on the basis of T1, and the negative wire withdrawal speed is increased from S2 by △S222.

[0128] Among them, the expression of abnormal voltage control strategy to reduce the current forward wire feeding speed is:

[0129]

[0130] In the formula, is the current forward wire feeding speed after the abnormal voltage control strategy is reduced, is the original forward wire feeding speed, is the forward wire feeding speed variable of the abnormal voltage control strategy;

[0131] The expression of abnormal voltage control strategy to reduce wire feeding delay time after normal short circuit detection is:

[0132]

[0133] In the formula, is the wire feeding delay time after normal short circuit detection after abnormal voltage control strategy is reduced, is the original wire feeding delay time, is the wire feeding delay time variable of the abnormal voltage control strategy;

[0134] The expression of abnormal voltage control strategy to increase the current negative wire drawing speed is:

[0135]

[0136] In the formula, The current negative wire drawing speed is increased by using the abnormal voltage control strategy. is the original negative wire retraction speed, It is the negative wire retraction speed variable of abnormal voltage control strategy.

[0137] also, Figures 2 to 4 The other parameters Tr0, Ts, T2, etc. are respectively: the standard setting value Tr0 of the arcing stage duration, that is, the standard duration of the arcing stage during welding under standard conditions; the standard setting value Ts of the short-circuit stage duration, that is, the standard duration of the short-circuit stage during welding under standard conditions; the standard setting value T2 of the wire drawing delay time after arcing detection, that is, when wire drawing welding is performed according to the standard state, after arcing is detected, negative wire drawing is still maintained within the T2 time period, until the T2 time period ends, and then it is changed to positive wire feeding.

[0138] Example 2

[0139] This embodiment provides an arc control device for wire drawing welding under abnormal voltage, comprising:

[0140] Data acquisition module, calculation module, current welding state judgment module, arcing state judgment module and adjustment module;

[0141] The data acquisition module is used to acquire the actual voltage value and the peak voltage value within a set time before each peak current output ends, starting from the moment of arc detection;

[0142] The calculation module is used to calculate the current voltage change rate according to the current actual voltage value and the previous actual voltage value, and to perform average calculation on the peak voltage value within the set time before each peak current output ends, so as to obtain the average value of the peak voltage within the set time before the corresponding peak current output ends;

[0143] The current welding state judgment module is used to judge whether the current state is an arcing stage or a short circuit stage according to the comparison result between the current voltage change rate and the change rate setting value and the current actual voltage value and the voltage setting value;

[0144] The arcing state judgment module is used to judge whether a small short circuit occurs in the arcing stage according to the comparison results of the real-time voltage change rate and the change rate setting value, the actual voltage value and the voltage setting value, and the short circuit duration and the short circuit duration setting value during the arcing stage; and to judge whether an abnormal voltage occurs in the arcing stage according to the comparison results of the real-time voltage change rate and the change rate setting value and the actual voltage value and the voltage setting value or the comparison results of the real-time voltage change rate and the change rate setting value and the average value of the peak voltage and the actual voltage value during the arcing stage;

[0145] The adjustment module is used to generate corresponding welding parameters to control the positive wire feeding speed, the wire feeding delay time after normal short circuit detection and the negative wire drawing speed when a small short circuit or voltage abnormality occurs.

[0146] In this embodiment, the values ​​of K0, K1, K2, V0, V1, T1, T2, Tr0, Tr1, IPV, S1, △S1, △S11, △S111, △T1, △T11, △T111, S2, △S2, △S22, and △S222 are different depending on the welding material, wire diameter, shielding gas, and welding current. Appropriate standard parameters should be formulated according to specific circumstances.

[0147] In summary, the present invention detects the voltage value, voltage change rate, duration of the short circuit stage, and duration of the arcing stage in real time from each arcing detection moment during the welding process to classify and judge the small short circuit and abnormal voltage, and adopts different control strategies to match its welding parameters with the real-time current and voltage, ensuring the consistency and stability of the output of the short circuit and arcing stages in the current and next cycles, thereby ensuring the stability of the arc. The small short circuit occurrence stage in the welding process is refined and classified, and the corresponding control strategy is adopted to finely generate the corresponding welding parameters, so that when the short circuit stage and the arcing stage alternate, the positive wire feeding speed, the wire feeding delay time after the normal short circuit detection, and the negative wire drawing speed are controlled in real time to stabilize the alternating state, effectively reducing or eliminating the continuous influence of small short circuits or abnormal voltages on wire drawing welding.

[0148] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, 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 code.

[0149] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (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 the 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.

[0150] 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 comprising 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.

[0151] 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. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0152] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which all fall within the protection of the present invention.

Claims

1. An arc control method for wire drawing welding under abnormal voltage, characterized in that: include: From the moment of arc detection, obtain the actual voltage value and the peak voltage value within the set time before each peak current output ends; Calculate the current voltage change rate based on the current actual voltage value and the previous actual voltage value; The peak voltage value within the set time before each peak current output ends is averaged, and the average value of the peak voltage within the set time before the corresponding peak current output ends is obtained and dynamically updated as the arc detection cycle changes; According to the comparison result between the current voltage change rate and the change rate setting value and the current actual voltage value and the voltage setting value, it is judged whether the current stage is the arcing stage or the short circuit stage; In the arcing stage, whether a small short circuit occurs in the arcing stage is determined based on the comparison results between the real-time voltage change rate and the change rate setting value, the actual voltage value and the voltage setting value, and the short circuit duration and the short circuit duration setting value; In the arcing stage, according to the comparison result of the real-time voltage change rate and the change rate setting value and the actual voltage value and the voltage setting value, or the comparison result of the real-time voltage change rate and the change rate setting value and the average value of the peak voltage and the actual voltage value, it is judged whether abnormal voltage occurs in the arcing stage; When a small short circuit or voltage anomaly occurs, the corresponding welding parameters are generated to control the positive wire feeding speed, the wire feeding delay time after normal short circuit detection, and the negative wire drawing speed.

2. The arc control method for wire drawing welding under abnormal voltage according to claim 1, characterized in that: From the moment of arc detection, obtain the actual voltage value and the peak voltage value within the set time before each peak current output ends, including: From the moment of each arc detection, the actual voltage value V is obtained in real time at a fixed time interval; Record the peak voltage value within 200us before the end of the peak current output.

3. The arc control method for wire drawing welding under abnormal voltage according to claim 1, characterized in that: According to the current actual voltage value and the previous actual voltage value, the current voltage change rate is calculated, including: Calculate the difference between the actual voltage value obtained in the previous time interval and the current actual voltage value to obtain the current voltage change; The current voltage change rate is calculated based on the current voltage change and the time interval.

4. The arc control method for wire drawing welding under abnormal voltage according to claim 1, characterized in that: According to the comparison result between the current voltage change rate and the change rate setting value and the current actual voltage value and the voltage setting value, it is judged whether the current state is the arcing stage or the short circuit stage, including: If the current voltage change rate is less than or equal to the first set value of the change rate, and the current actual voltage value is less than or equal to the first set value of the voltage, then the current welding stage is the short circuit stage; If the current voltage change rate is greater than or equal to the second set value of the change rate, and the actual voltage value is greater than or equal to the second set value of the voltage, then the current welding stage is the arcing stage.

5. The arc control method for wire drawing welding under abnormal voltage according to claim 1, characterized in that During the arcing stage, the comparison between the real-time voltage change rate and the change rate setting value, the actual voltage value and the voltage setting value, and the short circuit duration and the short circuit duration setting value is used to determine whether a small short circuit occurs during the arcing stage, including: During the arcing stage, if the real-time voltage change rate is less than or equal to the first set value of the change rate, the actual voltage value is less than or equal to the first set value of the voltage, and the short circuit duration is less than the short circuit duration setting value, a small short circuit occurs during the arcing stage.

6. The arc control method for wire drawing welding under abnormal voltage according to claim 1, characterized in that In the arcing stage, according to the comparison result of the real-time voltage change rate and the change rate setting value and the actual voltage value and the voltage setting value, or the comparison result of the real-time voltage change rate and the change rate setting value and the average value of the peak voltage and the actual voltage value, it is judged whether abnormal voltage occurs in the arcing stage, including: During the arcing stage, if the real-time voltage change rate is greater than or equal to the third setting value of the change rate, and the actual voltage value is greater than or equal to the third setting value of the voltage, or the real-time voltage change rate is greater than or equal to the third setting value of the change rate, and the actual voltage value is greater than or equal to the average value of the current peak voltage, then abnormal voltage occurs during the arcing stage.

7. The arc control method for wire drawing welding under abnormal voltage according to claim 1, characterized in that: When a small short circuit occurs, the corresponding welding parameters are generated to control the positive wire feeding speed, the wire feeding delay time after normal short circuit detection, and the negative wire drawing speed, including: Respectively obtain the start time of the micro short circuit and the start time of the corresponding arcing stage; Calculate the start time of the micro short circuit and the start time of the corresponding arc burning stage to obtain the time difference between the micro short circuit and the corresponding arc burning stage; If the occurrence time of the micro short circuit is within a specific time period of the arcing stage, the first adjustment strategy is used to generate welding parameters for the next arcing stage, and the positive wire feeding speed, the wire feeding delay time after the normal short circuit is detected, and the negative wire drawing speed are controlled in the next arcing stage; If the occurrence time of the micro short circuit is outside the specific time period of the arcing stage, the second adjustment strategy is used to generate the welding parameters of the next arcing stage to control the positive wire feeding speed of the next arcing stage, the wire feeding delay time after the normal short circuit detection and the negative wire drawing speed.

8. The arc control method for wire drawing welding under abnormal voltage according to claim 7, characterized in that: The first adjustment strategy is used to generate welding parameters for the next arcing stage, and the positive wire feeding speed, the wire feeding delay time after the normal short circuit detection and the negative wire drawing speed are controlled in the next arcing stage, including: In the next arcing stage, the first adjustment strategy is adopted to reduce the positive wire feeding speed, reduce the wire feeding delay time after the normal short circuit detection, and increase the negative wire withdrawal speed; Among them, the expression of the first adjustment strategy to reduce the forward wire feeding speed is: In the formula, is the forward wire feeding speed after the first adjustment strategy is reduced, is the original forward wire feeding speed, It is the time interval between the occurrence of a small short circuit and the detection of the corresponding arc. Set the duration for the arc, is the forward wire feeding speed variable of the first adjustment strategy; The expression of the first adjustment strategy to reduce the wire feeding delay time after normal short circuit detection is: In the formula, It is the wire feeding delay time after the normal short circuit detection after the first adjustment strategy is adjusted. is the original wire feeding delay time, is the wire feeding delay time variable of the first adjustment strategy; The expression of the first adjustment strategy to increase the negative wire retraction speed is: In the formula, is the negative wire retraction speed after the first adjustment strategy is increased, is the original negative wire retraction speed, It is the negative wire retraction speed variable of the first adjustment strategy.

9. The arc control method for wire drawing welding under abnormal voltage according to claim 7, characterized in that: The second adjustment strategy is used to generate welding parameters for the next arcing stage, and the positive wire feeding speed, wire feeding delay time after normal short circuit detection and negative wire drawing speed are controlled in the next arcing stage, including: In the next arcing stage, the second adjustment strategy is adopted to increase the positive wire feeding speed, reduce the wire feeding delay time after the normal short circuit detection, and increase the negative wire withdrawal speed; Among them, the expression of the second adjustment strategy increasing the forward wire feeding speed and decreasing the forward wire feeding speed is: In the formula, is the forward wire feeding speed after the second adjustment strategy is reduced, is the original forward wire feeding speed, It is the time interval between the occurrence of a small short circuit and the detection of the corresponding arc. Set the duration for the arc, is the forward wire feeding speed variable of the second adjustment strategy; The expression of the second adjustment strategy to reduce the wire feeding delay time after normal short circuit detection is: In the formula, It is the wire feeding delay time after normal short circuit detection after adjustment by the second adjustment strategy. is the original wire feeding delay time, is the wire feeding delay time variable of the second adjustment strategy; The expression of the second adjustment strategy to increase the negative wire retraction speed is: In the formula, is the negative wire retraction speed after the second adjustment strategy increases, is the original negative wire retraction speed, It is the negative wire retraction speed variable of the second adjustment strategy.

10. The arc control method for wire drawing welding under abnormal voltage according to claim 7, characterized in that: When voltage anomalies occur, corresponding welding parameters are generated to control the positive wire feeding speed, the wire feeding delay time after normal short circuit detection, and the negative wire drawing speed in real time, including: Adopt abnormal voltage control strategy to generate welding parameters in the current arcing stage, reduce the current positive wire feeding speed, reduce the wire feeding delay time after normal short circuit detection and increase the current negative wire drawing speed; Among them, the expression of abnormal voltage control strategy to reduce the current forward wire feeding speed is: In the formula, is the current forward wire feeding speed after the abnormal voltage control strategy is reduced, is the original forward wire feeding speed, is the forward wire feeding speed variable of the abnormal voltage control strategy; The expression of abnormal voltage control strategy to reduce wire feeding delay time after normal short circuit detection is: In the formula, is the wire feeding delay time after normal short circuit detection after abnormal voltage control strategy is reduced, is the original wire feeding delay time, is the wire feeding delay time variable of the abnormal voltage control strategy; The expression of abnormal voltage control strategy to increase the current negative wire drawing speed is: In the formula, The current negative wire drawing speed is increased by using the abnormal voltage control strategy. is the original negative wire retraction speed, It is the negative wire retraction speed variable of abnormal voltage control strategy.

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