JP2007083268A - Arc welding system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve such problems that, when the welding is performed on the same welding member by a plurality of welding equipment, one welding equipment cannot fully remove the noise based on the operations of other welding equipment, a neck is mistakenly detected by the effect of the switching operation of the other welding equipment, occurrence of spatter cannot be reduced, and the excellent welding result is hardly obtained. <P>SOLUTION: The control state of other welding equipment is detected in one welding equipment. When detecting the change of the control state for affecting the change in the welding current and/or the welding voltage, the neck can be correctly determined by providing the function of prohibiting the neck detection, and occurrence of spatter can be reduced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an arc welding system provided with a plurality of arc welding apparatuses that generate an arc between a welding wire and a welding base material (work) to perform welding output control.

  In recent years, in consumable electrode type arc welding equipment, in order to suppress the occurrence of spatter, so-called neck detection control is performed to reduce the welding current immediately before the short circuit is opened in anticipation of the short circuit being opened, and the arc is regenerated. It has been practiced to reduce the arc current by reducing the welding current at the moment.

  In a conventional consumable electrode type arc welding apparatus, when a short circuit occurs, a control circuit that controls the welding output increases the current in accordance with a predetermined slope in order to release the short circuit. As the current increases, the wire in the short-circuited portion melts and the molten metal moves toward the base metal side, and a constriction occurs between the welding wire and the base metal side melted portion (so-called neck, hereinafter referred to as a neck). .) Occurs. And in this neck part, since a cross-sectional area becomes small, resistance value increases. For this reason, when a neck occurs, the amount of change in the welding voltage increases despite the fact that the current increase is kept constant by short-circuit control. Then, by detecting this voltage change amount, the occurrence of a neck is detected, and the process proceeds to neck detection control.

  Here, in the conventional consumable electrode type arc welding apparatus, as will be described later, in order to obtain an output suitable for welding, a switching element for switching the rectified output of the AC power supply is provided. Due to the influence of the element, a ripple voltage synchronized with the switching of the switching element is superimposed on the welding voltage, and this ripple voltage may reduce the neck detection probability. Therefore, what removes noises, such as a ripple voltage, is known (for example, refer patent document 1).

  FIG. 7 shows a schematic configuration of the above-described conventional arc welding apparatus, in which 71 is a first rectifying element for rectifying the output of the AC power supply, and 72 is a first switching for switching the output of the first rectifying element 71. The element 73 is a main transformer that supplies power to the welding load and is provided with a secondary auxiliary winding, 74 is a second rectifying element that rectifies the output of the main transformer 73, and 75 is an auxiliary of the main transformer 73. A third rectifier for rectifying the output of the winding, 76 is a second switching element provided between the second rectifier 74 and the output terminal, 77 is a current detector, 78 is a voltage detector, 79 Is a differential amplifier circuit for calculating the difference between the output of the voltage detector 78 and the output of the third rectifier element 75, and 710 controls the welding output by controlling the first switching element and the second switching element. Welding control circuit

About the conventional arc welding apparatus comprised as mentioned above, the operation | movement is demonstrated. The electric power supplied from the AC power source is converted to DC by the first rectifying element 71. The DC power is input to the main transformer 73 as necessary power according to the welding state by the first switching element 72. The large current obtained from the output side of the main transformer 73 is converted into a direct current by the second rectifying element 74 and supplied to the welding load via the second switching element 76. The welding current flowing to the welding load is detected by the current detector 77 and fed back to the welding control circuit 710. The welding voltage applied to the welding load is detected by a voltage detector 78. Here, the welding voltage detected by the voltage detector 78 includes a ripple component generated by the first switching element 72, and the output of the third rectifying element 75 is the ripple component of the first switching element 72. Therefore, the difference component between the output of the third rectifying element 75 and the output of the voltage detector 78 is calculated by the differential amplifier 79, so that the ripple component included in the welding voltage can be removed. In this way, the welding voltage from which the ripple component has been removed is input to the welding control circuit 710 and used for accurate neck portion detection and welding output control.
JP-A-10-180443

  However, the conventional arc welding apparatus, as described above, can control the welding output by removing the influence of the ripple component due to the switching element constituting the arc welding apparatus itself, For example, when welding is performed on the same workpiece by a plurality of arc welding apparatuses, as shown in FIG. 8, the welding voltage detected by the other arc welding apparatus by the output control switching operation of one arc welding apparatus or There was a problem that a fluctuation occurred in the welding current and it could not be determined whether this fluctuation was caused by a change in the welding phenomenon.

  If the fluctuation (referred to as noise here) due to the operation of other welding equipment cannot be removed, an erroneous detection of the neck will occur. Control was performed, and it had the subject that it became difficult to suppress generation | occurrence | production of a sputter | spatter and to obtain a favorable welding result. In addition, depending on the noise situation, the short circuit opening may be erroneously detected.

  The present invention prevents misdetection of a neck or false detection of short circuit opening, performs welding output control suitable for the situation, reduces the amount of spatter by stabilizing the welding state, and obtains a good welding result. An object of the present invention is to provide an arc welding system capable of performing the above.

  In order to solve the above problems, an arc welding system of the present invention is an arc welding system that performs welding using at least a first welding device and a second welding device, and the first welding device includes: A voltage detection unit for detecting a welding voltage of the first welding device; a current detection unit for detecting a welding current of the first welding device; and welding information of the second welding device from the second welding device. Detecting a neck that is in a state immediately before the arc shifts from a short-circuited state to an open state based on the communication unit that receives the signal, the output of the voltage detection unit and / or the current detection unit, and the information received by the communication unit And a neck detecting unit for determining whether or not it has been performed.

  And by setting it as such a structure, the misdetection of a neck is prevented.

  In the arc welding system, the welding information received by the first welding device from the second welding device is a switching element for controlling the welding output of the second welding device of the second welding device. It is the information which shows the timing of switching which operates.

  Moreover, the neck detection part with which a 1st welding apparatus is provided is characterized by not determining with the timing which the 2nd welding apparatus switched the switching element having detected the neck.

  Further, the first welding device and the second welding device in the arc welding system transmit information by bidirectional serial communication.

  The arc welding system of the present invention is an arc welding system that performs welding using at least a first welding device and a second welding device, and the first welding device is the first welding device. A voltage detection unit that detects a welding voltage of the first welding device, a current detection unit that detects a welding current of the first welding device, a welding state detection unit that detects a welding voltage and / or a welding current of the second welding device, And determining whether or not a neck which is a state immediately before the arc is shifted from the short-circuit state to the open state is detected based on the output of the voltage detection unit and / or the current detection unit and the output of the welding state detection unit And a neck detection unit.

  And by setting it as such a structure, the misdetection of a neck is prevented.

  Moreover, the neck detection part with which the 1st welding apparatus in the said arc welding system is provided does not determine with the neck being detected, when the detection state of a welding state detection part changes abruptly.

  The arc welding system of the present invention is an arc welding system for performing welding using at least a first welding device, a second welding device, and a monitoring device for monitoring a welding state of each welding device, wherein the monitoring is performed. The apparatus includes a first communication unit that communicates welding information with each welding apparatus. The first welding apparatus includes a voltage detection unit that detects a welding voltage of the first welding apparatus, and the first welding. A current detection unit for detecting a welding current of the device, a second communication unit for receiving welding information of another welding device from the monitoring device, an output of the voltage detection unit and / or the current detection unit, and the second And a neck detection unit that determines whether or not a neck that is in a state immediately before the arc is shifted from the short-circuit state to the open state is detected based on the information received by the communication unit.

  And by setting it as such a structure, the misdetection of a neck is prevented.

  Also, the welding information received from the monitoring device by the first welding device in the arc welding system is the switching timing for operating the switching element for controlling the welding output of the other welding device that the other welding device has. It is the information which shows.

  Moreover, the neck detection part with which the 1st welding apparatus in the said arc welding system is provided does not determine with the timing which the other welding apparatus switched the switching element having detected the neck.

  In addition, each welding apparatus and the monitoring apparatus in the arc welding system transmit information by bidirectional serial communication.

  As described above, the present invention shares welding information in each welding apparatus, or monitors a welding state of a welding apparatus that can be affected as necessary, or monitors welding information in each welding apparatus. In this way, it is possible to prevent erroneous detection of the neck state and reduce the occurrence of spatter.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to FIGS.

(Embodiment 1)
FIG. 1 is a block diagram showing a schematic configuration of an arc welding system in the present embodiment. In FIG. 1, 1 is a first welding apparatus, and 15 is a second welding apparatus, which is a welding system for welding the same welding members. Reference numeral 2 denotes an AC power source for supplying power to the first welding apparatus 1.

  In the first welding apparatus 1, 3 is a first rectifying element that rectifies the output of the AC power supply 2, and 4 is a first switching that switches the output of the first rectifying unit 3 to obtain an output suitable for welding. Element 5 is a main transformer for supplying electric power to the welding load, 6 is a second rectifying element for rectifying the output of the main transformer 5, and 7 is a second switching element having one end connected to the second rectifying element 6. , 8 is a resistor connected in parallel to the second switching element 7, 9 is a reactor connected in series with the second switching element 7 for stabilizing the welding current output, 10 is a current detection for detecting the welding current Reference numeral 11 denotes a voltage detector for detecting a welding voltage.

  Reference numeral 12 denotes a neck detector for detecting the occurrence of a neck generated at the tip of the welding wire during welding. The neck detector 12 receives the outputs of the current detector 10 and the voltage detector 11 and the communication unit 13. The neck detection is determined based on the welding information in the second welding apparatus 15.

  Reference numeral 14 denotes a welding output control unit for controlling the welding output by controlling the first switching element 4 and the second switching element 7 based on the outputs of the current detection unit 10, the voltage detection unit 11, and the neck detection unit 12. is there.

  In FIG. 1, the second welding device 15 is simply illustrated because it has the same configuration as the first welding device 1.

  The welding information in the second welding device 15 is, for example, switching information for operating the second switching element 7 for controlling the welding output of the second welding device 15 included in the second welding device 15. It includes information indicating timing.

  The operation of the arc welding system configured as described above will be described.

  In the first welding apparatus 1, the electric power supplied from the AC power source 2 is converted into a direct current by the first rectifying element 3 and supplied to the first switching element 4 as a DC power source. The first switching element 4 is on / off controlled by the welding output control unit 14, thereby controlling the power supplied to the main transformer 5. The electric power supplied to the main transformer 5 is converted into a direct current by the second rectifying element 6 and supplied to the welding load (between the welding wire and the base material).

  Here, during normal welding, the second switching element 7 is in an on (short-circuited) state, and a welding current is supplied to the welding load via the reactor 9. When it is necessary to sharply reduce the welding current flowing in the welding load (for example, when the arc state is changed to a short circuit state or when a constriction is detected), the welding output control unit 14 uses the second switching element. 7 is turned off (opened) to cut off the low-impedance welding current supply path, and the energy stored in the main transformer 5 is consumed by the resistor 8 connected in parallel to the second switching element 7. In addition, application of a transient high voltage to the second switching element 7 is prevented.

  The current detector 10 detects the welding current supplied to the welding load and outputs it as a welding current Ia. The voltage detector 11 detects the welding voltage applied to the welding load and outputs it as the welding voltage Va. To do.

  Next, a basic neck detection operation in the neck detection unit 12 will be described with reference to FIGS. 1 and 2.

  FIG. 2 is a schematic diagram showing temporal changes in waveforms of the welding current (Ia), welding voltage (Va), and welding voltage variation (dv / dt) during short-circuit welding.

  The neck detection unit 12 determines whether the welding state is an arc state or a short circuit state (arc / short circuit state) from the output Ia of the current detection unit 10 and the output Va of the voltage detection unit 11. In the case of a short circuit state, a change amount dv / dt per predetermined time is calculated for the output Va of the voltage detection unit 11 and compared with a preset neck detection level value dVn, and the voltage change amount dv / dt is the neck detection level. If the value is larger than the value dVn, a neck signal indicating the occurrence of the neck is output to the welding output control unit 14 because the neck is generated.

  In the initial state of the short circuit (for example, the state where the welding current Ia is low), the value of the welding voltage Va may become oscillating, and at this time, the voltage change amount dv / dt becomes large, resulting in erroneous neck determination. In some cases, the neck detection unit 12 detects the neck as an AND condition that the welding current Ia is equal to or higher than a preset neck current level In obtained by an experiment or the like as a condition for determining the neck. It is desirable to do.

  Next, in the first welding apparatus 1, a method for preventing erroneous neck detection using the welding information of the second welding apparatus 15 received from the second welding apparatus 15 by the communication unit 13 will be described with reference to FIGS. 3 will be described.

  FIG. 3 is a schematic diagram showing temporal changes in waveforms of the welding current (Ia), welding voltage (Va), and welding voltage change (dv / dt) during short-circuit welding. When the welding current changes abruptly due to the operation of the second switching element 7 provided in the second welding device 15 (for example, the second welding device 15 prevents an increase in current during a short circuit or releases the short circuit) For example, as shown by 31 in FIG. 3, the welding voltage in the first welding apparatus 1 causes a voltage fluctuation similar to noise due to the influence thereof, for example, by suppressing the welding current at the time of occurrence of the neck immediately before. The communication unit 13 of the first welding device 1 transmits information on the welding control state of the second welding device 15 from the second welding device 15 (the welding output of the second welding device 15 included in the second welding device 15). Information including information indicating the timing of switching for operating the second switching element 7 for control. And this signal is output to the neck detection part 12, In this neck detection part 12, it judges that the fluctuation | variation of the voltage shown by 31 parts of FIG. 3 originated in the current control in the 2nd welding apparatus 15, and a neck Disable detection. That is, neck detection is not performed for a predetermined period, and neck detection control is not performed.

  And in the 1st welding apparatus 1, when the fluctuation | variation of the voltage shown to 32 parts of FIG. 3 arises, if the information that the 2nd welding apparatus 15 performed switching control at this time is not received, it will be a bottleneck. The detection unit 12 determines that the neck detection condition is satisfied, detects the occurrence of the neck, and outputs a signal indicating the generation to the welding output control unit 14. And the welding output control part 14 which received the signal from the neck detection part 12 controls the 1st switching element 4 and the 2nd switching element 7 in order to perform the desired welding current output at the time of neck generation.

  Further, the welding output control unit 14 outputs the information to the communication unit 13 every time the second switching element 7 is turned on / off at the time of occurrence of the short circuit and the neck detection, and the communication unit 13 that has received this information The welding information in the first welding device 1 is transmitted to the second welding device 15.

  At this time, the communication unit 13 of the first welding apparatus 1 is connected to the second welding apparatus 15 via a bidirectional serial line, so that communication of welding control information between the welding apparatuses is a switch for operating a switching element. It is possible to send various welding control information other than information indicating the timing of the welding (for example, information indicating during the short-circuit period, during the arc period, during the slope processing in changing the welding conditions, etc.) and communication by the other welding apparatus It goes without saying that real-time communication can be easily realized without waiting for communication.

  In addition, in this Embodiment, the example which connects and controls two welding apparatuses is shown, However, It is not restricted to two, Three or more are connected and welding information is transmitted between each welding apparatus. You may make it communicate and prevent a neck misdetection with each welding apparatus. In addition, only one communication line is described as being connected to the communication unit 13 of the first welding apparatus 1, but when configuring an arc welding system with three or more welding apparatuses, the communication unit 13 is required as necessary. It goes without saying that the number of communication lines connected to is increased.

  As described above, according to the welding system of the present embodiment, it is possible to prevent erroneous neck detection by performing neck detection in consideration of welding information of other welding apparatuses.

(Embodiment 2)
In the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In addition, in FIG. 4 used for the description of the present embodiment, there is a part in which the description of the configuration and operation of the welding apparatus is also omitted, but those not shown in the present embodiment are basically implemented. This is the same as the first embodiment.

  FIG. 4 is a block diagram showing a schematic configuration of the arc welding system in the present embodiment, which is different from the first embodiment in that welding detected by the current detection unit 10 and the voltage detection unit 11 in the first welding device 41. Welding state detection for detecting the welding control state in the second welding device 43 by inputting the current Ia1 and the welding voltage Va1 to the outside and the welding current Ia2 and welding current Va2 detected in the second welding device 43 as inputs. The point is that the portion 42 is provided.

  The welding state detection unit 42 detects the control state in the second welding device 43 based on the welding current Ia2 and the welding voltage Va2 output from the second welding device 43 and outputs them to the neck detection unit 12. The neck detector 12 is based on the welding current Ia1 output from the current detector 10, the welding voltage Va1 output from the voltage detector 11, and the detection state of the control state in the second welding device 43 output from the welding state detector 42. To detect the neck. For example, when the detection state of the welding state detection unit 42 changes abruptly (for example, transition from arc section control to short circuit section control, transition from short circuit section control to neck processing control, etc.), the neck detector 12 Even if the welding current Ia1 and the welding voltage Va1 satisfy the conditions for detecting the neck (a change amount per hour, etc.), the first welding process causes a sudden change in the control state in the second welding device 43. It is determined that the welding current or welding voltage detected by the welding apparatus 41 is affected, and the neck detection is not performed.

  Next, a method for detecting a welding state in the welding state detection unit 42 will be described in detail with reference to FIG. FIG. 5 is a schematic diagram showing the waveforms of the welding current Ia2 and the welding voltage Va2 output from the second welding apparatus 43 and the amount of change per predetermined time of Ia2 and Va2.

  As shown in FIG. 5, when the welding control state changes, a sharp change occurs in the welding current Ia2 and the welding voltage Va2. In particular, in the second welding apparatus 43, for example, the ON / OFF timing of the second switching element 7 that is performed in order to change the welding current sharply as neck detection control, or welding such as a short-circuit state from an arc state. When the control state changes, the current change amount dIa2 / dt and the voltage change amount dVa2 / dt per predetermined time are compared with preset threshold values ΔI1, −ΔI2, ΔV1, and −ΔV2 obtained through experiments or the like. Changes in the switching state and welding state can be detected.

  In the welding state detection unit 42 of the first welding device 41, when the calculated value of dIa2 / dt falls below -ΔI2, the timing at which the second switching element 7 is turned off in the second welding device 43. Detect as. Further, when the calculated value of dIa2 / dt exceeds ΔI1, the second welding device 43 detects the timing when the second switching element 7 is turned on.

  Moreover, in the welding state detection part 42 of the 1st welding apparatus 41, when the calculated value of dVa2 / dt exceeds (DELTA) V1, in 2nd welding apparatus 43, a control state changes from short circuit section control to arc section control. Detect that Further, when the calculated value of dVa2 / dt falls below −ΔV2, the second welding apparatus 43 detects that the control state has changed from arc section control to short circuit section control.

  In this way, the welding state detection unit 42 outputs the ON / OFF change timing of the second switching element 7 in the second welding device 43 and the welding control state of the second welding device 43 to the neck detection unit 12. .

  The neck detection unit 12 receives the input information from the welding state detection unit 42 even if the welding current Ia1 and the welding voltage Va1 satisfy the conditions for detecting the neck (a change amount per time, etc.). 2 shows a steep change in the control state in the second welding apparatus 43, the welding current or welding voltage detected by the first welding apparatus 41 due to the steep change in the control state in the second welding apparatus 43. Neck detection is not performed because it is determined to be affected.

  Moreover, in the welding state detection part 42, based on the arc / short circuit determination algorithm and neck detection algorithm which the 1st welding apparatus 41 has using the welding current Ia2 and the welding voltage Va2 which are output from the 2nd welding apparatus 43. Detecting that a change in the welding control state has occurred in the second welding apparatus 43 and that the neck detection control has been performed in the second welding apparatus 43, and outputting these information to the neck detection unit 12. But similar functions can be realized.

  As described above, according to the present embodiment, it is possible to prevent erroneous neck detection by inputting current information and voltage information of another welding apparatus and performing neck detection in consideration of these.

(Embodiment 3)
In the present embodiment, detailed description of the same parts as those in the first embodiment will be omitted. In addition, in FIG. 6 used for the description of the present embodiment, there is a portion where the description of the configuration and operation of the welding apparatus is also omitted, but those not shown in the present embodiment are basically implemented. This is the same as the first embodiment.

  FIG. 6 is a block diagram showing a schematic configuration of the arc welding system in the present embodiment, which is different from the first embodiment in that a monitoring device 61 for monitoring the welding state of each welding device is provided.

  In FIG. 6, the monitoring device 61 receives information related to welding control from the first welding device 1 and the second welding device 15 from a line connected to the communication unit 62, and from the first welding device 1 through each line. The received information is transmitted to the second welding apparatus 15 and the information received from the second welding apparatus 15 is transmitted to the first welding apparatus 1. The monitoring device 61 extracts only information indicating the switching timing of the second switching element 7 of one welding device from the welding control information received from the first and second welding devices 1 and 15. Alternatively, it may be transmitted to the other welding apparatus. For example, in the first welding apparatus 1, the communication unit 13 receives information indicating the switching timing of the second switching element 7 of the second welding apparatus 15 received from the monitoring apparatus 61, and this information is a bottleneck. By notifying the detection unit 12, accurate neck detection can be performed as in the first embodiment.

  In addition, the communication unit 13 of the first welding device 1 transmits welding control information including information indicating the switching timing of the second switching element 7 to the monitoring device 61, thereby allowing the first welding device 1 through the monitoring device 61. The welding control state in the first welding device 1 can be notified to the second welding device 15, and the neck detection can be performed in the second welding device 15 in the same manner as in the first welding device 1. it can.

  In the first embodiment, it is necessary to provide a communication line for each welding apparatus to be affected. By providing the monitoring device 61, the welding apparatus includes a communication line with the monitoring device 61. Therefore, the number of communication lines can be reduced, and the communication lines can be simply configured. For example, in the case of a welding system composed of four welding apparatuses, a total of six communication lines are required when welding information is communicated between the respective welding apparatuses as shown in the first embodiment. When the monitoring device 61 is provided and the welding information is communicated between the welding devices via the monitoring device 61 as in the present embodiment, it can be realized by a total of six communication lines.

  In addition, by configuring the communication line connecting each welding apparatus and the monitoring apparatus 61 to be capable of bidirectional serial communication, real-time communication that does not cause communication waiting due to communication by the other welding apparatus can be easily realized. By sending and receiving various welding information to and from each welding device, the monitoring device 61 can monitor the status and welding results of all of the plurality of welding devices provided in the arc welding system, and control the welding quality of the welding system. It is also possible to use for this, and it is very useful.

  In the present embodiment, an example in which two welding apparatuses are used is shown. However, the number of welding apparatuses is not limited to two, and a welding system is configured by using three or more welding apparatuses. It is also possible to prevent erroneous neck detection.

  As described above, according to the welding system of the present embodiment, neck misdetection can be prevented by performing neck detection in consideration of welding information of other welding apparatuses obtained via the monitoring device 61. .

  The arc welding system of the present invention detects the control state of another welding apparatus, and if a change in the control state that affects the amount of change in the welding current and welding voltage is detected, the neck detection at that time is invalidated. Thus, even when the welding current or the welding voltage fluctuates depending on the control state of another welding apparatus, it is possible to prevent the neck from being erroneously detected and accurately perform the neck determination. The present invention is industrially useful as an arc welding system for performing welding on a welding member using a plurality of welding apparatuses.

The block diagram which shows schematic structure of the arc welding system in Embodiment 1 of this invention. The schematic diagram which shows the waveform of the welding current at the time of the short circuit welding in Embodiment 1 of this invention, welding voltage, and welding voltage variation | change_quantity The schematic diagram which shows the waveform of the welding current at the time of short circuit welding, the welding voltage, and the welding voltage variation | change_quantity at the time of being influenced by the welding output control of the 2nd welding apparatus in Embodiment 1 of this invention. The block diagram which shows schematic structure of the arc welding system in Embodiment 2 of this invention. The schematic diagram which showed the variation | change_quantity per predetermined time of welding current Ia2 and welding voltage Va2 which were output from the 2nd welding apparatus, and Ia2 and Va2. The block diagram which shows schematic structure of the arc welding system in Embodiment 3 of this invention. A block diagram showing a schematic configuration of a conventional arc welding apparatus The figure which shows the example which the switching of one arc welding apparatus influences the voltage waveform of another arc welding apparatus

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 41 1st welding apparatus 15, 43 2nd welding apparatus 2 AC power source 3 1st rectification element 4 1st switching element 5 Main transformer 6 2nd rectification element 7 2nd switching element 8 Resistance 9 Reactor 10 Current detection unit 11 Voltage detection unit 12 Neck detection unit 13, 62 Communication unit 14 Welding output control unit 42 Welding state detection unit 61 Monitoring device

Claims (10)

An arc welding system for performing welding using at least a first welding device and a second welding device,
The first welding apparatus includes:
A voltage detector for detecting a welding voltage of the first welding device;
A current detector for detecting a welding current of the first welding device;
A communication unit for receiving welding information of the second welding device from the second welding device;
Based on the output of the voltage detection unit and / or the current detection unit and the information received by the communication unit, it is determined whether or not a neck, which is a state immediately before the transition from the short-circuit state to the open state, is detected. An arc welding system with a neck detector. The welding information received by the first welding apparatus from the second welding apparatus indicates the switching timing for operating the switching element for controlling the welding output of the second welding apparatus included in the second welding apparatus. The arc welding system of claim 1 including information. The arc welding system according to claim 2, wherein the neck detection unit provided in the first welding apparatus does not determine that the neck has been detected at a timing when the second welding apparatus performs switching of the switching element. The arc welding system according to any one of claims 1 to 3, wherein the first welding device and the second welding device transmit information by bidirectional serial communication. An arc welding system for performing welding using at least a first welding device and a second welding device,
The first welding apparatus includes:
A voltage detector for detecting a welding voltage of the first welding device;
A current detection unit for detecting a welding current of the first welding apparatus;
An arc is generated based on a welding state detection unit that detects a welding voltage and / or welding current of the second welding apparatus, an output of the voltage detection unit and / or the current detection unit, and an output of the welding state detection unit. An arc welding system comprising: a neck detection unit that determines whether or not a neck that is a state immediately before the transition from the short-circuit state to the open state is detected. The arc welding system according to claim 5, wherein the neck detection unit provided in the first welding apparatus does not determine that the neck has been detected when the detection state of the welding state detection unit changes sharply. An arc welding system that performs welding using at least a first welding device, a second welding device, and a monitoring device that monitors a welding state of each welding device,
The monitoring device
A first communication unit that communicates welding information with each welding apparatus;
The first welding apparatus includes:
A voltage detector for detecting a welding voltage of the first welding device;
A current detector for detecting a welding current of the first welding device;
A second communication unit for receiving welding information of another welding device from the monitoring device;
Whether or not a neck, which is a state immediately before the arc transitions from the short-circuit state to the open state, is detected based on the output of the voltage detection unit and / or the current detection unit and the information received by the second communication unit An arc welding system including a neck detection unit for determining whether or not. The welding information received by the first welding apparatus from the monitoring apparatus includes information indicating a switching timing for operating a switching element for controlling a welding output of the other welding apparatus included in the other welding apparatus. The arc welding system described. The arc welding system according to claim 8, wherein the neck detection unit included in the first welding apparatus does not determine that the neck has been detected at a timing when the other welding apparatus performs switching of the switching element. The arc welding system according to any one of claims 7 to 9, wherein each welding device and the monitoring device transmit information by bidirectional serial communication.

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