CN115397594A - Arc welding control method, welding power supply, welding system, and detection method - Google Patents
Arc welding control method, welding power supply, welding system, and detection method Download PDFInfo
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- CN115397594A CN115397594A CN202180027300.7A CN202180027300A CN115397594A CN 115397594 A CN115397594 A CN 115397594A CN 202180027300 A CN202180027300 A CN 202180027300A CN 115397594 A CN115397594 A CN 115397594A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/06—Arrangements or circuits for starting the arc, e.g. by generating ignition voltage, or for stabilising the arc
- B23K9/073—Stabilising the arc
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/095—Monitoring or automatic control of welding parameters
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Abstract
The invention provides a control method, a welding power supply, a welding system and a detection method of arc welding, which can control by monitoring not only a short-circuit period but also an arc period, and can stabilize a droplet transition or an arc earlier and ensure welding operation performance well even if the droplet transition or the arc is unstable due to external disturbance. The long-term short-circuit determination means determines that the short-circuit period is a long-term short circuit when determining that data corresponding to the 1 st threshold value Tmax acquired from the welding information is equal to or greater than the 1 st threshold value Tmax, and the short-term arc determination means determines that the arc period is a short-term arc when determining that data corresponding to the 2 nd threshold value Tamin acquired from the welding information is equal to or less than the 2 nd threshold value Tamin, and corrects the welding condition when both the determination of the long-term short circuit and the determination of the short-term arc are satisfied.
Description
Technical Field
The present invention relates to a control method, a welding power source, a welding system, and a detection method for arc welding for suppressing arc instability in arc welding in which a short circuit period and an arc period are alternately repeated.
Background
Gas Metal Arc Welding (GMAW) is a Welding method in which an Arc is generated between a consumable electrode (hereinafter also referred to as a Welding wire) and a base material (hereinafter also referred to as a workpiece or a workpiece) and the Welding wire and the base material are melted using the Arc as a heat source, and is a technique generally used in Welding in various industries. When this GMAW is used, the arc welding phenomenon changes depending on various welding conditions, but generally, arc welding is often performed using welding conditions in which a short-circuit period and an arc period are alternately generated.
Here, the short-circuit period is a period from when the welding wire and the base material contact each other and the arc disappears to when the welding wire and the base material separate from each other and the arc is generated, and the arc period is a period in which the welding wire and the base material separate from each other and the arc continues to be generated. When the short-circuit period and the arc period are alternately repeated without a large change, good welding workability can be maintained, but if external disturbances such as feeding failure and shielding gas failure occur, droplet transfer is disturbed, the short-circuit period and the arc period are also disturbed, and the amount of spatter generated increases, thereby deteriorating welding workability.
In order to solve the above-described problem, patent document 1 discloses a welding current control method in a short circuit period, which detects a value related to a droplet size at a time point when a short circuit occurs, and increases an inclination and/or a peak value of a welding current in the short circuit period to be larger than a predetermined value when the value is less than a predetermined 1 st reference value or equal to or more than a predetermined 2 nd reference value which is a value larger than the 1 st reference value. According to this technique, when the correlation value is less than the 1 st reference value or equal to or greater than the 2 nd reference value, if the droplet size at the time of short circuit occurrence is too small or too large deviating from the appropriate range, that is, if the droplet size at the time of short circuit occurrence is too small or too large, the inclination and/or peak value of the welding current during short circuit is controlled to a value larger than a predetermined value (reference value), whereby the droplet transient state can be kept stable, and the amount of spatter generated can be reduced.
Patent document 2 discloses an arc welding apparatus and an arc welding system, in which the length of a short-circuit occurrence period is detected, the increase rate of a short-circuit current in the next short-circuit occurrence period is increased as the detected length of the short-circuit occurrence period is increased, and the increase rate of a short-circuit current in the next short-circuit occurrence period is decreased as the detected length of the short-circuit occurrence period is decreased, thereby preventing welding from becoming unstable and suppressing generation of spatters.
Documents of the prior art
Patent document
Patent document 1: JP 2014-83571A
Patent document 2: JP 2012-76131A
Disclosure of Invention
Problems to be solved by the invention
As described above, the conventional technique described above always monitors only the short-circuit period and performs control only during the short-circuit period. However, even if the short-circuit period is controlled when external disturbance occurs, if the arc period is not within the appropriate range, it is difficult to maintain the appropriate droplet size at the next short-circuit, and it takes time until droplet transfer or arc stabilization is continued. That is, when the welding workability deteriorates due to the occurrence of the external disturbance, it takes time to return the welding workability to a good state, and the deterioration of the welding workability by the recovery time is considered as a bad influence in the entire welding work.
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a method for controlling arc welding, a welding power supply, a welding system, and a detection method, which can control an arc period while monitoring not only a short-circuit period but also the arc period, thereby enabling early droplet transfer or arc stabilization even if droplet transfer or arc instability occurs due to external disturbance, and thus ensuring welding workability well.
Means for solving the problems
Accordingly, the above object of the present invention is achieved by the following configuration (1) relating to a method of controlling arc welding.
(1) A control method of arc welding, which uses a welding power source provided with a long-term short-circuit determination means for determining whether a short-circuit period is a long-term short circuit and a short-term arc determination means for determining whether an arc period is a short-term arc, and alternately repeats the short-circuit period and the arc period, characterized in that a predetermined 1 st threshold value is set based on at least one of welding information detected in the short-circuit period, the long-term short-circuit determination means determines that the short-circuit period is the long-term short circuit when determining that data corresponding to the 1 st threshold value acquired from the welding information is equal to or greater than the 1 st threshold value, a predetermined 2 nd threshold value is set based on at least one of the welding information detected in the arc period, the short-term arc determination means determines that the arc period is the short-term arc when determining that data corresponding to the 2 nd threshold value acquired from the welding information is equal to or less than the 2 nd threshold value, and the short-term arc determination means corrects the arc condition when determining that both the long-term short-circuit period and the short-term arc determination means satisfy the arc condition.
According to this configuration, the most unstable phenomenon that becomes a long-term short circuit and a short-term arc can be detected early. This can suppress the occurrence of a short-term short circuit and the occurrence of a short-term arc, and can cause the arc to escape from an unstable state early, thereby suppressing spattering and obtaining a good bead appearance.
Further, a preferred embodiment of the present invention relating to a method of controlling arc welding relates to the following (2) to (12).
(2) The arc welding control method according to (1) is characterized in that the long-term short-circuit determination means detects at least a welding current, sets the 1 st threshold value as a predetermined welding current value as the welding information detected in the short-circuit period, and determines that the short-circuit period is the long-term short-circuit when the detected welding current value is equal to or greater than the predetermined welding current value.
With this configuration, it is possible to determine whether or not the short circuit is a long-term short circuit based on the welding current detected as the welding information during the short circuit period.
(3) The method for controlling arc welding according to (1), wherein the long-term short-circuit determination means detects at least one of a welding current and an arc voltage, sets the 1 st threshold as an elapsed time from a start of a predetermined short-circuit period as the welding information detected in the short-circuit period, and determines that the short-circuit period is the long-term short circuit when the elapsed time from the start of the short-circuit period detected based on the detected at least one of the welding current and the arc voltage is equal to or longer than the elapsed time from the start of the predetermined short-circuit period.
According to this configuration, it is possible to determine whether or not the short-circuit period is a long-term short circuit based on the elapsed time from the start of the short-circuit period detected as welding information in the short-circuit period.
(4) The arc welding control method according to (1) is characterized in that the short-circuit period includes one or more waveform control sections for performing waveform control of the welding current, the long-term short-circuit determination means detects at least one of the welding current and the arc voltage, and sets the 1 st threshold as a single time in the single waveform control section or a total time in the plurality of waveform control sections, or a target value of the welding current or the arc voltage, which is predetermined as the welding information detected in the short-circuit period, the short-circuit period is determined as the long-term short circuit when a single time in the single waveform control section or a total time in the plurality of waveform control sections detected based on at least one of the detected welding current and the detected arc voltage is equal to or longer than the predetermined single time or the predetermined total time, or when a detected welding current value or the detected arc voltage value is equal to or longer than a predetermined target value of the welding current or the arc voltage.
With this configuration, it is possible to determine with higher accuracy whether or not the short circuit is a long-term short circuit, and the arc stability is further improved.
(5) The arc welding control method according to (3) or (4), wherein the short-circuit period includes one or more waveform control sections for performing waveform control of the welding current, and the waveform control section includes at least: a 1 st waveform control section for reducing to a predetermined welding current value; a 2 nd waveform control section for increasing the welding current at a predetermined inclination; and a 3 rd waveform control section for increasing the welding current by a gentler gradient than the 2 nd waveform control section.
According to this structure, the droplet supply can be performed smoothly.
(6) The method for controlling arc welding according to (5), wherein when both the determination of the long-term short circuit and the determination of the short-term arc are satisfied, at least 1 of the welding conditions is corrected, the welding conditions being: (a) a welding current value, inclination, or time in the 1 st waveform control interval, (b) a welding current value, inclination, or time in the 2 nd waveform control interval, (c) a welding current value, inclination, or time in the 3 rd waveform control interval.
According to this configuration, the droplet transfer can be smoothly performed by correcting an appropriate item among the welding conditions.
(7) The method for controlling arc welding according to any one of (1) to (6), wherein after the correction of the welding conditions, the correction of the welding conditions is further performed when the determination of the long-term short circuit and the determination of the short-term arc are continuously generated a predetermined number of times or more, or when the determination is generated at a predetermined frequency.
According to this configuration, when the welding condition is corrected and then a long-term short circuit occurs and short-term arc occurs, the droplet transfer can be smoothly performed by further correcting the welding condition.
(8) The method for controlling arc welding according to any one of (1) to (7), wherein after the welding condition is corrected, if the short-circuit period is not started between predetermined periods after the start of the arc period, the welding condition after the correction is changed to an initial welding condition.
According to this configuration, when the short-circuit period does not start between the predetermined periods from the start of the arc period, it is considered that the arc welding is stable, and the welding conditions can be returned to the initial state.
(9) The method for controlling arc welding according to any one of (1) to (8), wherein after the welding condition is corrected, if the determination of the long-term short circuit and the determination of the short-term arc do not continuously occur more than a predetermined number of times or do not occur at a predetermined frequency, the welding condition after the correction is changed to an initial welding condition.
According to this configuration, when the determination of the long-term short circuit and the short-term arc does not occur continuously more than a predetermined number of times or does not occur at a predetermined frequency, it is determined that the arc welding is stable, and the welding conditions can be returned to the initial state.
(10) The method for controlling arc welding according to any one of (1) to (9), wherein the short-term arc determination means detects at least one of a welding current and an arc voltage, sets the 2 nd threshold as an elapsed time from a start of a predetermined arc period as the welding information detected in the arc period, and determines that the arc period is the short-term arc when the elapsed time from the start of the arc period detected based on the detected at least one of the welding current and the arc voltage is equal to or less than the elapsed time from the start of the predetermined arc period.
With this configuration, it is possible to determine whether or not the arc is a short-term arc based on the elapsed time from the start of the arc period detected as the welding information in the arc period.
(11) The method for controlling arc welding according to any one of (1) to (10), wherein when the short-circuit period is determined to be the long-term short-circuit, waveform control of a welding current determined in advance is performed.
According to this configuration, when the short-circuit period is determined to be a long-term short-circuit, the droplet transfer can be smoothly performed by performing predetermined waveform control.
(12) The method for controlling arc welding according to (11), wherein the waveform control is a waveform control for increasing or decreasing a welding current value to a predetermined value.
According to this configuration, when the short-circuit period is determined to be a long-term short-circuit, droplet supply can be smoothly performed by performing predetermined waveform control.
The above object of the present invention is achieved by the following configuration (13) relating to the welding power source.
(13) A welding power supply for use in controlling arc welding in which a short-circuit period and an arc period are alternately repeated, the welding power supply comprising: a long-term short circuit determination unit that sets a 1 st threshold value that is predetermined based on at least one piece of welding information among the pieces of welding information detected during the short circuit period, and determines that the short circuit period is a long-term short circuit when it is determined that data corresponding to the 1 st threshold value acquired from the welding information is equal to or greater than the 1 st threshold value; a short-term arc determination unit that sets a 2 nd threshold value that is predetermined based on at least one piece of welding information among the welding information detected in the arc period, and determines that the arc period is a short-term arc when it is determined that data corresponding to the 2 nd threshold value acquired from the welding information is equal to or less than the 2 nd threshold value; and welding condition correcting means for correcting a welding condition when both the determination of the long-term short circuit by the long-term short circuit determining means and the determination of the short-term arc by the short-term arc determining means are satisfied.
According to this configuration, when both the determination of the long-term short circuit and the determination of the short-term arc are satisfied, the welding condition correcting means corrects the welding condition, and thus stable arc welding can be performed.
The above object of the present invention is achieved by the following configuration (14) of the welding system.
(14) A welding system provided with a welding robot, a feeding device, a welding power supply, a shielding gas supply device, and a welding control device, for use in arc welding control in which a short-circuit period and an arc period are alternately repeated, the welding system being characterized in that the welding power supply is provided with: a long-term short circuit determination unit that sets a 1 st threshold value that is predetermined based on at least one piece of welding information among the welding information detected during the short circuit period, and determines that the short circuit period is a long-term short circuit when it is determined that data corresponding to the 1 st threshold value acquired from the welding information is equal to or greater than the 1 st threshold value; a short-term arc determination unit configured to set a 2 nd threshold value that is predetermined based on at least one piece of welding information among the pieces of welding information detected in the arc period, and determine the arc period as a short-term arc when it is determined that data corresponding to the 2 nd threshold value acquired from the welding information is equal to or less than the 2 nd threshold value; and welding condition correcting means for correcting a welding condition when both the determination of the long-term short circuit by the long-term short circuit determining means and the determination of the short-term arc by the short-term arc determining means are satisfied.
According to this configuration, when both the determination of the long-term short circuit and the determination of the short-term arc are satisfied, the welding condition correcting means corrects the welding condition, and thus stable arc welding can be performed.
The above object of the present invention is achieved by the following configuration (15) relating to the detection method.
(15) A detection method for detecting a long-term short circuit in a short-circuit period and a short-term arc in an arc period by using a welding power supply including a long-term short circuit determination unit that determines whether the short-circuit period is a long-term short circuit and a short-term arc determination unit that determines whether the arc period is a short-term arc, the detection method being characterized in that a predetermined 1 st threshold value is set based on at least one of welding information detected in the short-circuit period, the long-term short circuit determination unit determines that the short-circuit period is the long-term short circuit when determining that data corresponding to the 1 st threshold value acquired from the welding information is equal to or greater than the 1 st threshold value, and a predetermined 2 nd threshold value is set based on at least one of the welding information detected in the arc period, and the short-term arc determination unit determines that the arc period is the short-term arc when determining that the data corresponding to the 2 nd threshold value acquired from the welding information is equal to or less than the 2 nd threshold value.
According to this configuration, the short-circuit period and the arc period are monitored, and whether or not the short-circuit period is a long-term short-circuit or a short-term arc can be determined based on the detected welding information.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the arc welding control method, the welding power supply, the welding system, and the detection method of the present invention, by monitoring the short-circuit period and the arc period, it is possible to stabilize the droplet transfer or the arc earlier and to ensure the welding workability well even if the droplet transfer or the arc is unstable due to the external disturbance
Drawings
Fig. 1 is a schematic view showing a configuration example of an arc welding system according to the present invention.
Fig. 2 is a block diagram of a welding power supply.
Fig. 3 is a graph showing an example of a method for determining a long-term short circuit and a short-term arc when waveform control is not performed during a short circuit period.
Fig. 4 is a graph showing another determination method for a long-term short circuit and a short-term arc in the case where the waveform control during the short circuit period is not performed.
Fig. 5 is a graph showing a state in which welding conditions are corrected by the occurrence of a long-term short circuit and a short-term arc when waveform control is performed during a short circuit period.
Fig. 6 is a graph showing a state in which welding conditions are not corrected because the arc period is a long-term arc in spite of a long-term short circuit when waveform control of the short-circuit period is performed.
Fig. 7 is a graph showing a voltage waveform and a current waveform in a short-circuit period including a plurality of waveform control sections.
Fig. 8 is a graph illustrating correction of the current waveform control parameter during the short-circuit period.
Fig. 9 is a graph showing a state in which the current waveform control parameter in the short circuit period is further corrected after the correction of the welding conditions.
Fig. 10 is a graph showing a state of correction of the reset waveform control section.
Fig. 11 is a graph showing a state of correction in a non-reset waveform control section.
Detailed Description
An embodiment according to the present invention will be described below with reference to the drawings. The welding system according to the present embodiment is an example of a case where a welding robot is used, and is not limited to the configuration of the present embodiment. For example, the welding system of the present invention may be mounted on an automatic welding apparatus using a carriage.
< overview of arc welding System >
First, an outline of an arc welding system according to the present embodiment will be described. Fig. 1 is a schematic view showing a configuration example of an arc welding system according to the present embodiment. The arc welding system 50 includes a welding robot 100, a feeding device 300, a welding power source 400, a shielding gas supply device 500, and a welding control device 600.
Welding power supply 400 is connected to welding wire 211 as a consumable electrode via positive power supply cable 401, and is connected to workpiece W as a workpiece to be welded via negative power supply cable 402 0 And (4) connecting. When welding is performed with the opposite polarity, and when welding is performed with the positive polarity, the welding power supply 400 is connected to the workpiece W via the positive power cable 0 Connected via a negative power supplyThe cable is connected to the welding wire 211.
Further, the welding power source 400 and the feeding device 300 of the welding wire 211 are connected by signal lines, respectively, and the feeding speed of the welding wire can be controlled.
The welding robot 100 includes a welding torch 200 as an end effector. Welding torch 200 includes a contact tip as an energizing mechanism for energizing welding wire 211. The welding wire 211 generates an arc from the tip by the current supplied from the contact tip, and welds the workpiece W to be welded by the heat of the arc 0 。
Further, the welding torch 200 includes a shielding gas nozzle 210 serving as a mechanism for ejecting shielding gas. The shielding gas may be carbonic acid gas (also known as CO) 2 Gas), argon gas (also known as Ar gas), or Ar + CO for example 2 Any of such mixed gases. Further, it is more preferable to use CO as the shielding gas 2 When the gas is a mixed gas, it is more preferable that Ar is mixed with 10 to 30% of CO 2 A system of gases. The shielding gas is supplied from the shielding gas supply device 500.
The wire 211 used in the present embodiment may be either a solid wire containing no flux (flux) or a flux-added wire containing flux. The material of the wire 211 is not limited, and may be, for example, mild steel, stainless steel, aluminum, titanium, or a plated layer of Cu or the like on the surface of the wire. Further, the diameter of the wire 211 is not particularly limited. In the case of the present embodiment, it is preferable that the upper limit of the diameter is 1.6mm and the lower limit is 0.8mm.
Further, the work W 0 The shape of the joint, the welding posture, the groove shape, and the like are not particularly limited.
Welding control apparatus 600 controls the operation of welding robot 100. Welding control apparatus 600 holds in advance teaching data for specifying the operation mode (pattern) of welding robot 100, the welding start position, the welding end position, the welding conditions, the weaving operation, and the like, and instructs welding robot 100 to control the operation of welding robot 100. Welding control device 600 also supplies welding conditions such as a welding current, a welding voltage, and a feed speed in the welding operation to welding power supply 400 via communication cable 601 in accordance with teaching data.
Welding power supply 400 sends a command to welding wire 211 and workpiece W in accordance with a command from welding control device 600 0 Supplying electric power to make the welding wire 211 and the workpiece W 0 An arc is generated therebetween. Further, welding power supply 400 outputs a signal for controlling the speed of feeding wire 211 to feeding device 300 in accordance with an instruction from welding control device 600.
< functional Structure of welding Power supply >
Next, the functional configuration of the welding power supply according to the present embodiment will be described in detail. As shown in fig. 2, welding power supply 400 includes: a power supply unit PM that supplies power for generating an arc and performing welding; an addition circuit ADD that receives signals such as a feed speed command, a welding current command, and a welding voltage command, and calculates a control amount of power supply unit PM; a voltage detection unit VD that detects a welding voltage during welding and outputs a welding voltage detection signal VD; a current detection unit ID that detects a welding current during welding and outputs a welding current detection signal ID; a short-circuit/arc discriminating circuit 410 for discriminating a short-circuit period or an arc period based on the welding voltage detection signal Vd; and a correction amount calculation circuit 420 that calculates a correction amount for controlling the power supply unit PM based on the information of the short-circuit period and the arc period.
The power supply unit PM of the welding power supply 400 receives a 3-phase 200V commercial power supply as an input, and outputs a welding voltage and a welding current by controlling an output of an input ac voltage in accordance with a current error amplification signal Ei that is an error amplification signal of a control output current setting signal Iset and a welding current detection signal Id, which will be described later, in an inverter, an inverter transformer, a rectifier, and the like, which are not shown. Further, a reactor WL is configured to smooth the output voltage.
The current detection unit ID detects a welding current during welding and outputs a welding current detection signal ID. The welding current detection signal Id is digitally converted by an a/D converter not shown, and is input to a current error amplifier circuit EI, an arc voltage control circuit 431, other control circuits not shown, for example, a correction circuit such as a current control circuit for pulse generation, and the like. The current error amplifier circuit EI inputs a current error amplified signal EI to the power supply unit PM. The power supply unit PM performs output control on an inverter, an inverter transformer, a rectifier, and the like in accordance with the current error amplification signal Ei, and outputs a welding voltage and a welding current.
The voltage detection unit VD detects a welding voltage during welding and outputs a welding voltage detection signal VD. The welding voltage detection signal Vd is digitally converted by an a/D converter, not shown, and is input to an arc voltage control circuit 431, other control circuits, not shown, and a correction circuit, which are described later, in the short circuit/arc determination circuit 410 and the output current control circuit 430.
Short-circuit/arc determination circuit 410 receives welding voltage detection signal Vd as an input, and outputs an arc period determination signal at a high level when welding voltage detection signal Vd is equal to or greater than a predetermined threshold value VAS (see fig. 3), and outputs a short-circuit period determination signal at a low level when welding voltage detection signal Vd is less than predetermined threshold value VAS. The threshold value VAS is preferably selected from a range of 10V to 22V, more preferably 13V, and still more preferably has a threshold value (threshold). In the present embodiment, the arc period and the short-circuit period are determined based on the arc voltage (welding voltage), but the determination is not limited to this, and may be performed based on, for example, a detection signal of arc sound, a moving image of droplet transition obtained by a visual sensor, or the like.
The output current control circuit 430 receives welding current setting value IS, output voltage setting value VS, wire feed speed setting value WFR, which are input from the welding current setting circuit IS, output voltage setting circuit VS, and wire feed speed setting circuit WFR and stored in the storage DB in advance, or a waveform control setting value, and outputs a current setting signal Ir to the addition circuit ADD. In the present embodiment, the respective set values are output to the output current control circuit 430 via the storage DB, but the set values may be directly input to the output current control circuit 430. The set value of the waveform control includes, for example, a set value of a control period and a set value of an inclination in the case of performing the short-circuit waveform control.
The correction current Ierr output from the correction amount calculation circuit 420 is input to the addition circuit ADD. The addition operation circuit ADD ADDs the current setting signal Ir output from the current setting circuit 432 in the output current control circuit 430 to the correction current Ierr, and outputs a control output current setting signal Iset to the current error amplification circuit EI. The correction current Ierr may be input to the addition circuit ADD not only to the correction current output from the correction amount calculation circuit 420 but also to a correction current output from another correction circuit not shown. Examples of the other correction circuit include a correction circuit for controlling external characteristics.
The storage DB has data such as various initial setting signals, thresholds used in the determination and calculation units, and external characteristic coefficients of the welding power supply (also referred to as output characteristics of the welding power supply), and outputs signals to the circuits and the units.
< functional Structure of correction amount calculating Circuit >
Next, the functional configuration of the correction amount calculation circuit according to the present embodiment will be described in detail. As shown in fig. 2, the correction amount calculation circuit 420 includes a short-term arc determination unit 421, a long-term short-circuit determination unit 422, and a correction current calculation unit 423.
The short-term arc determination unit 421 measures the time when the determination signal from the short-circuit/arc determination circuit 410 is at a high level, that is, when the arc period determination signal is output, and outputs a signal (short-term arc signal) as a short-term arc when the measured time is equal to or less than a predetermined threshold, that is, equal to or less than the time that elapses from the start of a predetermined arc period.
The long-term short circuit determination unit 422 measures the time or welding current value when the determination signal from the short circuit/arc determination circuit 410 is at a low level, that is, when the short-circuit period determination signal is output, and outputs a signal (long-term short circuit signal) as a long-term short circuit when the measured time or welding current value is equal to or greater than a predetermined threshold value, that is, equal to or greater than a predetermined elapsed time from the start of the short circuit period.
When a signal as a short-term arc and a signal as a long-term short circuit are alternately input, the correction current calculation unit 423 calculates a correction amount and outputs a correction current Ierr.
Hereinafter, each embodiment regarding correction of welding conditions such as a welding current value and an arc voltage value in a short-circuit period or an arc period will be described based on a functional configuration.
The case of performing arc welding control in which a short-circuit period and an arc period are alternately repeated can be classified into a case of not performing waveform control of the short-circuit period and a case of performing waveform control of the short-circuit period. In either case, when both the determination of the long-term short circuit and the determination of the short-term arc are satisfied, specifically, when the long-term short circuit signal and the short-term arc signal are alternately input in the present embodiment, the welding condition is corrected.
< embodiment 1 relating to correction of welding conditions >
First, an example of correction of welding conditions in the case where waveform control during a short-circuit period is not performed will be described with reference to fig. 3. Fig. 3 is a graph showing an example of a method for determining a long-term short circuit and a short-term arc when waveform control is not performed during a short circuit period. Fig. 3 shows a welding current waveform and a welding voltage waveform in arc welding in which a short-circuit period and an arc period are alternately repeated, and waveforms indicating determination results of the short-circuit period and the arc period.
As shown in fig. 3, in the determination of whether or not a long-term short circuit occurs, a predetermined welding current value (Ithr) is set as a 1 st threshold value, and when the welding current value detected as welding information is equal to or greater than the 1 st threshold value, long-term short circuit determination unit 422 shown in fig. 2 determines that the short circuit period has occurred for a long period of time, and outputs a long-term short circuit signal (refer to short circuit period 1 in fig. 3).
In the determination of whether or not the arc is a short-term arc, the elapsed time (Tamin) from the start of the arc period, which is determined in advance, is set to the 2 nd threshold, and when the elapsed time from the start of the arc period, which is detected based on at least 1 of the welding current and the arc voltage detected as the welding information, is equal to or less than the 2 nd threshold, the short-term arc determination unit 421 shown in fig. 2 determines the arc period as a short-term arc and outputs a short-term arc signal (refer to the arc period 1 in fig. 3).
Then, when the long-term short-circuit signal and the short-term arc signal are alternately input and the determination of the long-term short circuit and the determination of the short-term arc are both satisfied, the correction current calculation unit 423 corrects the welding conditions such as the welding current value and the arc voltage value in the short-circuit period or the arc period. Note that the welding conditions after the correction are omitted in fig. 3.
In the determination of the short-circuit period or the arc period, as shown in fig. 3, the arc period is determined when the detected welding voltage is equal to or greater than the predetermined threshold value, that is, VAS, and the short-circuit period is determined when the detected welding voltage is less than VAS, which is the predetermined threshold value.
According to the above configuration, it is possible to determine whether or not the short circuit is a long-term short circuit based on the welding current detected as the welding information during the short circuit period.
Next, fig. 4 is a graph showing another example of the method for determining a long-term short circuit and a short-term arc. Fig. 4 also shows a welding current waveform and a welding voltage waveform in arc welding in which a short-circuit period and an arc period are alternately repeated, and waveforms indicating determination results of the short-circuit period and the arc period, as in fig. 3. As shown in fig. 4, in the determination of whether or not a long-term short circuit occurs, when the elapsed time (Tsmax) from the start of the short-circuit period, which is determined in advance, is equal to or greater than the 1 st threshold, and the elapsed time from the start of the short-circuit period, which is detected based on at least 1 of the welding current and the arc voltage detected as the welding information, is equal to or greater than the 1 st threshold, the long-term short circuit determination unit 422 shown in fig. 2 determines that the short-circuit period is a long-term short circuit, and outputs a long-term short circuit signal (refer to short-circuit period 2 in fig. 4).
In the determination of whether or not the arc is a short-term arc, a period (Tamin) from the start of an arc period determined in advance is set as a 2 nd threshold value, and when an elapsed time from the start of the arc period detected based on at least 1 of the welding current and the arc voltage detected as the welding information is equal to or less than the 2 nd threshold value, the short-term arc determination unit 421 shown in fig. 2 determines the arc period as a short-term arc and outputs a short-term arc signal (refer to the arc period 2 in fig. 4).
Then, when the long-term short-circuit signal and the short-term arc signal are alternately input, the correction current calculation unit 423 corrects the welding conditions such as the welding current value and the arc voltage value in the short-circuit period or the arc period. Note that the welding conditions after the correction are omitted in fig. 4.
Note that the determination method of determining whether or not a long-term short circuit occurs by setting the elapsed time from the start of the short-circuit period, which is predetermined as shown in fig. 4, to the 1 st threshold (Tsmax) is also applicable to the case where the waveform control of the short-circuit period is performed or the case where the waveform control of the short-circuit period is not performed.
According to the above configuration, it is possible to determine whether or not the short-circuit period is a long-term short circuit based on the elapsed time from the start of the short-circuit period detected as welding information in the short-circuit period.
As described above in the description of embodiment 1, according to this embodiment, the most unstable phenomenon that is a long-term short circuit and a short-term arc can be detected early. This can suppress the occurrence of a long-term short circuit and the continuous generation of a short-term arc, and can early escape from an unstable arc state, thereby suppressing spattering and obtaining a good bead appearance.
< embodiment 2 relating to correction of welding conditions >
Next, an example of correction of the welding conditions in the case where the waveform control during the short-circuit period is performed will be described with reference to fig. 5 to 11.
Fig. 5 is a graph showing a state in which waveform control in a welding condition, specifically, a short-circuit period is corrected when long-term short-circuit and short-term arc are alternately repeated. In the case of performing waveform control during a short circuit, it is preferable to determine whether or not the short circuit is a long-term short circuit and whether or not the short-term arc is a short-term arc, using time as a threshold value. In the present embodiment, the 1 st threshold is an elapsed time (Tsmax) from the start of a short-circuit period predetermined based on waveform control, and the 2 nd threshold is an elapsed time (Tamin) from the start of an arc period predetermined.
As shown in fig. 5, the elapsed time from the start of the short-circuit period in the short-circuit period 3 is longer than the 1 st threshold (Tsmax), and therefore, it is determined as a long-term short circuit, and the elapsed time from the start of the arc period in the arc period 3 is shorter than the 2 nd threshold (Tamin), and therefore, it is determined as a short-term arc. As described above, since the long-term short circuit and the short-term arc are alternately repeated, and the determination of the long-term short circuit and the determination of the short-term arc are both satisfied, the waveform control as the welding condition is corrected in the next short-circuit period 4. The specific waveform control is modified as described later in detail.
On the other hand, fig. 6 is a graph showing a state in which welding conditions are not corrected because the arc period is a long-term arc in spite of a long-term short circuit in the case of performing waveform control of the short-circuit period. As shown in fig. 6, although it is determined that short-circuiting is long since the elapsed time from the start of the short-circuit period in the short-circuit period 3 is longer than the 1 st threshold (Tsmax), it is not determined that short-term arcing is occurring since the elapsed time from the start of the arc period in the arc period 3A is longer than the 2 nd threshold (Tamin). Therefore, since the long-term short circuit and the short-term arc do not alternately repeat, and the determination of the long-term short circuit and the determination of the short-term arc are not both satisfied, the waveform control as the welding condition is not corrected in the next short-circuit period 4A.
Next, the waveform control of the welding current during the short circuit is described in detail with reference to fig. 7. Fig. 7 is a graph showing a voltage waveform and a current waveform in a short-circuit period including a plurality of waveform control sections. In the present embodiment, the waveform control of the welding current is performed during the short-circuit period. The waveform control is exemplified by control in a section a (Tss), a section B (Vslp 1), a section C (Vslp 2), and a section D (Imax), which are 4 sections. However, the number of intervals for waveform control is not particularly limited, and may be single or plural.
The interval a, i.e., the 1 st waveform control interval, is a period during which the welding current is reduced to a predetermined welding current value (Iss).
The interval B, i.e., the 2 nd waveform control interval, is a period during which the welding current is increased to a predetermined welding current value (Islp 1) at a predetermined inclination, i.e., at a current increase rate.
The section C, i.e., the 3 rd waveform control section, is a period in which the welding current is increased to a predetermined welding current value (Islp 2) at a gentler gradient than the section B, i.e., at a current increase rate.
The section D is a period in which predetermined waveform control is additionally performed after the short-circuit period is determined to be a long-term short-circuit. In the present embodiment, the welding current is increased to a predetermined peak current value (Imax). Then, the peak current (Imax) is maintained for a certain time. It is needless to say that the section D does not occur when the determination of the long-term short circuit is not made. In addition, as the predetermined waveform control, in addition to the increase to the predetermined welding current value as shown in the present embodiment, the predetermined waveform control may be reduced to the predetermined welding current value.
In the interval a, the welding current value is once reduced to Iss, so that the droplet transfer force is weakened, and the generation of sputtering is suppressed. In the interval B and the interval C, the welding current value is gradually increased to promote droplet transfer. Further, in the section D, when the short-circuit period is determined to be a long-term short-circuit, the welding current value is rapidly increased to forcibly perform droplet transfer. According to the above configuration, when it is determined that the short-circuit period is a long-term short-circuit, the welding current is further increased to forcibly perform the droplet transfer.
In the present embodiment, the 1 st threshold (Tsmax) is set to a time of a single waveform control section (single time) or a total time of a plurality of sections among the section a, the section B, and the section C. That is, when the elapsed time from the start of the short-circuit period is equal to or greater than the 1 st threshold (Tsmax), the short-circuit period is determined to be a long-term short circuit. With the above configuration, it is possible to determine whether or not the short circuit is a long-term short circuit earlier, and by inserting a predetermined waveform control or a waveform control section after correction, it is possible to expect early recovery of droplet transfer or arc stability.
Specifically, if the elapsed time of the interval a is set to the 1 st threshold, there is an advantage that a long-term short circuit can be determined at the initial stage of the short circuit period, and since a predetermined waveform control is inserted after the long-term short circuit determination, or waveform controls of the intervals B and C after correction are performed, the short-term arc thereafter is suppressed, or even if the short-term arc occurs thereafter, correction is performed immediately after the long-term short circuit determination, and the like, the droplet transfer and early recovery of arc stability can be realized.
Returning to fig. 5, when it is determined that the elapsed time from the start of the short-circuit period in the short-circuit period 3 is equal to or greater than the 1 st threshold (Tsmax), the short-circuit period is determined to be a long-term short-circuit, and the welding current value is rapidly increased by transitioning to the section D, so that the droplet transfer is forcibly performed. Next, in the arc period 3, since the elapsed time from the start of the arc period is equal to or less than the 2 nd threshold (Tamin), the arc period is determined to be a short-term arc. In this way, in the next short-circuit period 4, the waveform control as the welding condition shown in fig. 7 is corrected.
According to the above structure, the droplet transfer can be performed smoothly.
Next, as shown in fig. 8, the waveform control is preferably corrected by performing at least one control of the section a, the section B, and the section C. According to the above configuration, the droplet supply can be smoothly performed by correcting an appropriate item among the welding conditions.
Specifically, as shown by the broken line in fig. 8, in the section a, the correction amount is preferably calculated so as to control at least one of the target value (welding current value), inclination, and time of the welding current to be decreased, and more preferably, the elapsed time (Tss) of the section a can be controlled to be short (the section a after the correction is shown as a section a'). The inclination of the current slope in the section a is substantially determined by the inductance and reactance of the entire welding circuit, and therefore, it is difficult to control the current slope, and therefore, the current slope can be controlled only in time.
In the section B, it is preferable to calculate a correction amount so as to control at least one of a target value (welding current value), inclination, and time of the increased welding current (the section B after correction is indicated as a section B').
In the section C, the correction amount is preferably calculated so as to control at least one of the target value (welding current value), the inclination, and the time of the increased welding current, and more preferably, the inclination (Vslp 2) of the section C may be controlled (the section C after the correction is shown as a section C').
After the correction of the waveform control shown in fig. 8, that is, the welding conditions, it is preferable to further correct the welding conditions such that the correction amount of the waveform control is further increased when the signal for determining the short-term arc is continuously generated a predetermined number of times or more, or when the signal is generated a predetermined frequency, for example, 1 or more times every 3 times. According to the above configuration, when the welding condition is corrected and then a long-term short circuit occurs and short-term arc occurs, the droplet transfer can be smoothly performed by further correcting the welding condition.
As shown in fig. 9, since the elapsed time from the start of the short-circuit period in the short-circuit period 5 is equal to or greater than the 1 st threshold (Tsmax), it is determined as a long-term short-circuit, and since the elapsed time from the start of the arc period in the arc period 5 is equal to or less than the 2 nd threshold (Tamin), it is determined as a short-term arc, and the waveform control is corrected in the next short-circuit period 6. However, if the short-circuit period 6 is also determined to be a long-term short-circuit, and the next arc period 6 is also determined to be a short-term arc, the waveform control is further corrected in the next short-circuit period 7.
By correcting the waveform control in this manner, the initial appearance of the most unstable arc, which is a long-term short-circuit and short-term arc, is detected, and the occurrence of a long-term short-circuit and short-term arc is suppressed to make the arc earlier come out of the unstable arc state, thereby ensuring suppression of spatter generation and good bead appearance.
Then, as shown in fig. 10, after the short-circuit period 8 is determined as a long-term short circuit and the arc period 8 is determined as a short-term arc, and after the waveform control is corrected in the short-circuit period 9, if the short-circuit period is not started between the predetermined periods (Tamax) from the start of the arc period in the subsequent arc period 10, that is, if the elapsed time from the start of the arc period in the arc period 10 is longer than the predetermined period (Tamax), it can be determined that the arc period is a long-term arc and the arc welding returns to the stable state. Then, the waveform control may be changed to the initial welding condition shown in fig. 7 in the short circuit period 11, that is, the waveform control may be reset.
Further, although not shown, after the correction of the waveform control, in a case where the short-term short circuit occurs for a long period of time and the determination of the short-term arc does not occur continuously more than a predetermined number of times, or in a case where the short-term arc does not occur at a predetermined frequency, for example, does not occur 1 or more times every 3 times, it may be determined that the arc welding has returned to the steady state, and the waveform control may be changed to the initial welding condition, that is, the waveform control may be reset.
However, as shown in fig. 11, it is determined that the short-circuit period 8 is a long-term short circuit and the arc period 8 is a short-term arc, and after the waveform control is corrected in the short-circuit period 9, even if the arc period 10 thereafter is longer than the 2 nd threshold (Tamin), if it is shorter than a predetermined period (Tamax), that is, if Tamin < arc period 10<tamax, the waveform control in the short-circuit period 11 is not changed to the initial welding conditions.
As described above, the present invention is not limited to the above embodiments, and modifications, improvements, and the like can be appropriately made. For example, in embodiment 2, the total time (Tsmax) of the section a, the section B, and the section C is set to the 1 st threshold, but target values of the welding current and the arc voltage (for example, iss, islp1, islp2, and the like) in the section a, the section B, and the section C may be used as the 1 st threshold.
It is needless to say that the present invention is not limited to the examples described above, although various embodiments are described with reference to the drawings. It is obvious that those skilled in the art can conceive various modifications and variations within the scope of the claims, and it is needless to say that these modifications and variations fall within the technical scope of the present invention. In addition, the respective constituent elements in the above embodiments may be arbitrarily combined within a range not departing from the gist of the invention.
The present application is based on Japanese patent application No. 2020-146324 filed on 8/31/2020, and the contents thereof are incorporated herein by reference.
Description of the reference numerals
50. Arc welding system (welding system)
100. Welding robot
200. Welding torch
300. Feeding device
400. Welding power supply
421. Short-term arc determination unit (short-term arc determination unit)
422. Long-term short circuit determination unit
423. Correction current calculating part (welding condition correcting unit)
500. Protective gas supply device
600. Welding control device
A1 st waveform control section (section A, section A')
B2 nd waveform control section (section B, section B')
C3 rd waveform control section (section C, section C')
Ithr predetermined welding current value (1 st threshold)
Tsmax predetermined time elapsed from the start of the short-circuit period (1 st threshold)
Time elapsed from the start of Tamin predetermined arc period (threshold 2)
A predetermined period from the start of the Tamax arc period
W 0 And (5) a workpiece.
Claims (15)
1. A method for controlling arc welding, which uses a welding power supply having a long-term short-circuit determination means for determining whether a short-circuit period is a long-term short circuit and a short-term arc determination means for determining whether an arc period is a short-term arc, and which alternately repeats the short-circuit period and the arc period,
the method for controlling arc welding is characterized in that,
setting a 1 st predetermined threshold value based on at least one of the welding information detected in the short-circuit period,
the long-term short circuit determination means determines that the short circuit period is the long-term short circuit when determining that the data corresponding to the 1 st threshold value acquired from the welding information is equal to or greater than the 1 st threshold value,
setting a predetermined 2 nd threshold value based on at least one of the welding information detected in the arc period,
the short-term arc determination means determines that the arc period is the short-term arc when it is determined that the data corresponding to the 2 nd threshold acquired from the welding information is equal to or less than the 2 nd threshold,
in the case where both the determination of the long-term short circuit by the long-term short circuit determination means and the determination of the short-term arc by the short-term arc determination means are satisfied, the welding condition is corrected.
2. The control method of arc welding according to claim 1,
the long-term short-circuit determination unit detects at least a welding current as welding information detected in the short-circuit period,
setting the 1 st threshold value as a predetermined welding current value,
and determining the short-circuit period as the long-term short circuit when the detected welding current value is equal to or greater than the predetermined welding current value.
3. The control method of arc welding according to claim 1,
the long-term short circuit determination means detects at least one of a welding current and an arc voltage as welding information detected during the short circuit period,
the 1 st threshold is set to a predetermined elapsed time from the start of the short-circuit period,
and determining the short-circuit period as the long-term short circuit when an elapsed time from a start of the short-circuit period detected based on at least one of the detected welding current and the arc voltage is equal to or longer than the predetermined elapsed time from the start of the short-circuit period.
4. The control method of arc welding according to claim 1,
a single or multiple waveform control sections for performing waveform control of the welding current are included in the short-circuit period,
the long-term short circuit determination means detects at least one of a welding current and an arc voltage as welding information detected during the short circuit period,
setting the 1 st threshold value as a single time in the single waveform control section or a total time in the plurality of waveform control sections, or a target value of welding current or arc voltage,
the short-circuit period is determined as the long-term short circuit when a single time in the single waveform control section or a total time in the plurality of waveform control sections detected based on at least one of the detected welding current and arc voltage is equal to or longer than the predetermined single time or total time, or when the detected welding current value or the detected arc voltage value is equal to or longer than a target value of the predetermined welding current or arc voltage.
5. The control method of arc welding according to claim 3 or 4,
single or multiple waveform control intervals for performing waveform control of a welding current are included in the short circuit period,
the waveform control section has at least: a 1 st waveform control section for reducing to a predetermined welding current value; a 2 nd waveform control section for increasing the welding current at a predetermined inclination; and a 3 rd waveform control section for increasing the welding current by a gentler gradient than the 2 nd waveform control section.
6. The arc welding control method according to claim 5,
in case both the determination of the long-term short circuit and the determination of the short-term arc are fulfilled,
correcting at least 1 of the welding conditions among the welding conditions as follows:
(a) The welding current value, inclination or time in the 1 st waveform control section,
(b) The welding current value, inclination or time in the 2 nd waveform control section,
(c) A welding current value, inclination or time in the 3 rd waveform control interval.
7. The arc welding control method according to any one of claims 1 to 4,
after the welding condition is corrected, the welding condition is further corrected when the determination of the long-term short circuit and the determination of the short-term arc are continuously generated more than a predetermined number of times or when the determination of the short-term arc is generated at a predetermined frequency.
8. The arc welding control method according to any one of claims 1 to 4,
and changing the welding condition after the correction to an initial welding condition when the short circuit period is not started between a predetermined period after the start of the arc period after the correction of the welding condition.
9. The method for controlling arc welding according to any one of claims 1 to 4,
after the welding condition is corrected, if the determination of the long-term short circuit and the determination of the short-term arc do not occur continuously more than a predetermined number of times or do not occur at a predetermined frequency, the welding condition after the correction is changed to an initial welding condition.
10. The arc welding control method according to any one of claims 1 to 4,
the short-term arc determination unit detects at least one of a welding current and an arc voltage as welding information detected during the arc period,
the 2 nd threshold value is set to a predetermined elapsed time from the start of the arc period,
and determining the arc period as the short-term arc when an elapsed time from a start of the arc period detected based on at least one of the detected welding current and the arc voltage is equal to or less than the predetermined elapsed time from the start of the arc period.
11. The arc welding control method according to any one of claims 1 to 4,
when the short-circuit period is determined to be the long-term short circuit, waveform control of a predetermined welding current is performed.
12. The control method of arc welding according to claim 11,
the waveform control is a waveform control that causes an increase or decrease to a predetermined welding current value.
13. A welding power supply for use in controlling arc welding in which a short-circuit period and an arc period are alternately repeated, the welding power supply comprising:
a long-term short circuit determination unit that sets a 1 st threshold value that is predetermined based on at least one piece of welding information among the pieces of welding information detected during the short circuit period, and determines that the short circuit period is a long-term short circuit when it is determined that data corresponding to the 1 st threshold value acquired from the welding information is equal to or greater than the 1 st threshold value;
a short-term arc determination unit that sets a 2 nd threshold value that is predetermined based on at least one piece of welding information among the welding information detected in the arc period, and determines the arc period as a short-term arc when it is determined that data corresponding to the 2 nd threshold value acquired from the welding information is equal to or less than the 2 nd threshold value; and
and welding condition correcting means for correcting a welding condition when both the determination of the long-term short circuit by the long-term short circuit determining means and the determination of the short-term arc by the short-term arc determining means are satisfied.
14. A welding system comprising a welding robot, a feeding device, a welding power source, a shielding gas supply device, and a welding control device, for use in controlling arc welding in which a short-circuit period and an arc period are alternately repeated,
the welding system is characterized in that it is provided with,
the welding power supply includes:
a long-term short circuit determination unit that sets a 1 st threshold value that is predetermined based on at least one piece of welding information among the welding information detected during the short circuit period, and determines that the short circuit period is a long-term short circuit when it is determined that data corresponding to the 1 st threshold value acquired from the welding information is equal to or greater than the 1 st threshold value;
a short-term arc determination unit configured to set a 2 nd threshold value that is predetermined based on at least one piece of welding information among the pieces of welding information detected in the arc period, and determine the arc period as a short-term arc when it is determined that data corresponding to the 2 nd threshold value acquired from the welding information is equal to or less than the 2 nd threshold value; and
and welding condition correcting means for correcting a welding condition when both the determination of the long-term short circuit by the long-term short circuit determining means and the determination of the short-term arc by the short-term arc determining means are satisfied.
15. A detection method for detecting a long-term short circuit in a short circuit period and a short-term arc in an arc period by using a welding power supply including a long-term short circuit determination means for determining whether the short circuit period is a long-term short circuit and a short-term arc determination means for determining whether the arc period is a short-term arc,
the method of detection is characterized in that,
a predetermined 1 st threshold value is set based on at least one of the welding information detected during the short-circuit period, and the long-term short-circuit determination unit determines that the short-circuit period is the long-term short circuit when it is determined that data corresponding to the 1 st threshold value acquired from the welding information is equal to or greater than the 1 st threshold value,
and a 2 nd threshold value that is set in advance based on at least one piece of the welding information among the welding information detected in the arc period, wherein the short-term arc determination means determines that the arc period is the short-term arc when it is determined that data corresponding to the 2 nd threshold value acquired from the welding information is equal to or less than the 2 nd threshold value.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-146324 | 2020-08-31 | ||
| JP2020146324A JP7319238B2 (en) | 2020-08-31 | 2020-08-31 | Arc welding control method, welding power source, welding system and detection method |
| PCT/JP2021/028391 WO2022044700A1 (en) | 2020-08-31 | 2021-07-30 | Arc welding control method, welding power source, welding system, and detection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115397594A true CN115397594A (en) | 2022-11-25 |
| CN115397594B CN115397594B (en) | 2024-05-31 |
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| JP2014083571A (en) * | 2012-10-25 | 2014-05-12 | Daihen Corp | Welding current control method during short-circuit period |
| CN111315520A (en) * | 2018-10-12 | 2020-06-19 | 松下知识产权经营株式会社 | Arc welding control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60162577A (en) * | 1984-02-03 | 1985-08-24 | Hitachi Seiko Ltd | Discrimination method of weldability in arc welding |
| JPH11123546A (en) * | 1997-10-22 | 1999-05-11 | Chuo Motor Wheel Co Ltd | Method for judging stability of welding at starting arc and device for judging stability |
| JP2012110911A (en) * | 2010-11-22 | 2012-06-14 | Yaskawa Electric Corp | Welding system, welding control device, and method of detecting welding abnormality |
| CN102756197A (en) * | 2011-04-28 | 2012-10-31 | 株式会社大亨 | Welding current control method in short circuit period |
| JP2014083571A (en) * | 2012-10-25 | 2014-05-12 | Daihen Corp | Welding current control method during short-circuit period |
| CN111315520A (en) * | 2018-10-12 | 2020-06-19 | 松下知识产权经营株式会社 | Arc welding control method |
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| JP7319238B2 (en) | 2023-08-01 |
| JP2022041235A (en) | 2022-03-11 |
| KR20230039739A (en) | 2023-03-21 |
| WO2022044700A1 (en) | 2022-03-03 |
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