JP2016107274A - Laser welding system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laser welding system for improving production efficiency.SOLUTION: A laser welding system has a plurality of welders; a laser oscillator; a switching device; and general control means. The general control means generally controls the welders, the oscillator, and the switching device, and comprises a storage unit storing current-carrying priorities, welder determination means, normal-completion determination means, and priority determination means. The welder determination means performs determination processing for determining the welder having the highest current-carrying priority among the welders that have output welding request signals as an active welder. The normal-completion determination means determines whether weld processing by the active welder has been normally completed. When a determination result of the normal-completion determination means is YES, the priority determination means sets the current-carrying priority of the active welder to a lowest priority, advances current-carrying priorities of the welders lower than the current-carrying priority of the active welder, and maintains current-carrying priorities of the welders higher than the current-carrying priority of the active welder, With this configuration, it is possible to improve production efficiency.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a laser welding system in which a plurality of welding machines are systematized.

  2. Description of the Related Art Conventionally, as described in Patent Document 1, for example, a laser welding system is known in which a plurality of welding machines are systematized in a welding line and a plurality of welding processes are performed by a single laser oscillator. In such a laser welding system, usually, a laser irradiation order is determined in advance, and a welding machine is operated in accordance with the order so that different parts are sequentially welded to a workpiece flowing on the line. In front of each welding machine on the line, a certain amount of workpiece can be stored, and the workpiece for which welding has been completed is conveyed to the next welding machine. Then, the parts are sequentially welded on one line and finally the product is discharged to the downstream side of the line.

JP 11-309590 A

  However, in the above laser welding system, although the irradiation order is not lost, when one welding machine stops halfway, the welding machine to which the order is assigned does not operate after that, so that the stopped welding machine is restored. There was a problem that the operation rate of the entire line was lowered.

  In view of this, it is possible to consider a system in which the laser irradiation order is not determined and laser welding is performed by sequentially outputting a welding request signal from a facility capable of laser irradiation. Although this system can effectively use the waiting time at the time of abnormal stop by automatically skipping the stopped welder, the imbalance of the production amount for each welder occurs, resulting in the production of the entire system as a result. There has been a problem that the production efficiency of the manufactured products is reduced.

  The present invention was created in view of the above points, and an object thereof is to provide a laser welding system that improves the production efficiency of products.

  A laser welding system according to the present invention performs welding on a workpiece by selectively energizing the welding machine while conveying the workpiece from upstream to downstream of the welding line. The laser welding system includes a plurality of welding machines, a laser oscillator, And a switching device and overall control means.

  The welding machine includes a laser welding head and welding control means for outputting a welding request signal for requesting laser irradiation of the workpiece by the laser welding head. The laser oscillator irradiates laser light based on the welding request signal. The switching device switches the optical path of the laser light emitted from the laser oscillator.

  The overall control means controls the welding machine, the oscillator, and the switching device in an integrated manner based on the welding request signal. Furthermore, the overall control unit includes a storage unit, a welding machine determination unit, a normal completion determination unit, and a priority order determination unit.

  A memory | storage part memorize | stores the energization priority for determining the priority of a welding machine, when multiple welding request signals are detected. When the welding request signal is input, the welding machine determination means determines a welding machine having the highest energization priority among the welding machines from which the welding request signal is output as an execution welding machine that executes the welding process. I do.

  The normal completion determination means determines whether or not the welding process by the execution welder has been completed normally. The priority order determination means, when the normal completion determination means is a positive determination, lowers the energization priority of the execution welder and raises the energization priority of the welder having a lower energization priority than the execution welder, The energization priority of the welding machine having a higher energization priority than the execution welder is maintained.

  According to this configuration, when the welding process by the execution welder is normally completed, the priority determination unit sets the execution energization priority of the execution welder to be the lowest, and the welding machine having a lower energization priority than the execution welder. Each energization priority is incremented by one. And the energization priority of a welding machine with higher energization priority than an execution welder is maintained as it is.

  Then, the welding machine having the highest energization priority among the welding machines outputting the welding request signal is determined as the next execution welding machine by the welding machine determination means. In this way, the energization priority is changed based on the welding history of the execution welder.

  Thereby, the welding machine which has stopped abnormally and which has not output the welding request signal is automatically skipped, and welding is performed in the descending order of energization priority on the welding line. Further, the energization priority is maintained without being lowered unless the welding in the welding machine is completed. For this reason, if it returns from an abnormal stop and a welding request signal is output, the welding machine which necessarily lags in production will be preferentially determined as an execution welding machine.

  That is, it is possible to operate the entire system so as not to disturb the welding order on the welding line as much as possible and effectively use the time at the time of abnormal stop. Thereby, the variation in the production amount in each welding machine can be suppressed, and as a result, the production efficiency of products produced by the welding line can be improved.

The schematic diagram which shows the whole welding line provided with the welding system by 1st Embodiment. The block diagram which shows the whole structure of a laser welding system. Functional block diagram showing the functions of the oscillator controller as the overall control means The flowchart which shows the control procedure (main flow) which the oscillator control part as an integrated control means performs. The flowchart which shows the detail of a welding machine determination process. The flowchart which shows the detail of a priority order replacement | exchange process. It is a figure which shows the storage table of electricity supply priority, Comprising: The figure explaining the procedure of extraction from a storage area, and the storage to a storage area. A time chart explaining the operation of the entire system. It is a time chart explaining operation | movement of the whole system, and is a figure explaining operation | movement of the pattern different from FIG. It is a figure which shows the storage table of an energization priority, and is a figure explaining how a storage table is changed for every welding execution. The main flowchart by 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>
[Constitution]
The configuration of the first embodiment of the present invention will be described with reference to FIGS. As shown schematically in FIG. 1, the welding line 1 of the present embodiment includes a laser welding system 2 and a rail 4 as a conveyance path for the workpiece 3. Although details of the laser welding system 2 will be described later with reference to FIG. 2, the laser welding system 2 mainly includes a plurality of (four types in this embodiment) welding machines A, B, C, and D. The welding machine is arranged in the order of the welding machine A, the welding machine B, the welding machine C, and the welding machine D from the upstream side to the downstream side of the welding line 1.

  The laser welding system 2 performs welding by selectively energizing the welding machines A to D to the workpiece 3 conveyed from the upstream side to the downstream side of the welding line 1. Before each of the welding machines A to D on the welding line 1, a certain amount of the work 3 can be stored, and the work 3 for which the welding process has been completed is conveyed to the next welding machine. Then, the members are sequentially welded on one line, and finally a finished product is carried out to the downstream side of the line. Specifically, as a product produced on the welding line 1 of the present embodiment, for example, a high-pressure pump can be cited, and examples of the welding member include a discharge valve, a suction valve, a flange, an inlet, a seat upper, and a solenoid.

  Next, the configuration of the laser welding system 2 will be described. As shown in FIG. 2, the laser welding system 2 includes welding machines A, B, C, and D, a laser oscillator 21, and a beam switch 22 as a switching device. The welding machine A has a laser welding head 23 and a controller 24. In FIG. 2, the laser welding head is simply referred to as “laser head”. The welding machine B has a laser welding head 25 and a controller 26, and the welding machine C has a laser welding head 27 and a controller 28. The welding machine D has a laser welding head 29 and a controller 30.

  Each controller 24, 26, 28, 30 is constituted by a well-known PLC, and equipment control units 24a, 26a, 28a, 30a as welding control means for performing equipment control of the corresponding welding machines A, B, C, D. Have Each equipment control part 24a, 26a, 28a, 30a outputs the welding request signal Sr which requests | requires the laser irradiation to the workpiece | work 3 by the laser welding heads 23,25,27,29. The beam switch 22 switches energization between the laser oscillator 21 and each of the laser welding heads 23, 25, 27, and 29 using a switch.

  Furthermore, the controller 30 of the welding machine D includes an oscillator control unit 30b. The oscillator control unit 30b of the welding machine D and the equipment control units 24a, 26a, and 28a of the welding machines A, B, and C are connected by a signal line 31. The oscillator control unit 30 b of the welding machine D and the laser oscillator 21 are connected by a signal line 32. In the present embodiment, the oscillator control unit 30b of the welding machine D functions as an overall control unit that manages and manages the welding machines A to D, the laser oscillator 21, and the beam switch 22 based on the welding request signal Sr. The oscillator control unit 30b receives the welding request signal Sr from each equipment control unit 24a, 26a, 28a, 30a. Further, the oscillator control unit 30b transmits the optical path switching signal Sc, the program selection signal Sp, and the irradiation start signal Si to the laser oscillator 21, and receives the oscillator operation preparation completion signal Sd and the irradiation completion signal Sf from the laser oscillator 21.

  The optical path switching signal Sc is a signal for switching the optical path of the laser light by the beam switch 22. The program selection signal Sp is a signal for selecting a welding program set for each of the welding machines A to D. The oscillator operation preparation completion signal Sd is a signal indicating that the laser oscillator 21 is in a state capable of oscillating laser light. The irradiation start signal Si is a signal that oscillates laser light from the laser oscillator 21 in response to the oscillator operation preparation completion signal Sd. Laser light oscillated from the laser oscillator 21 is irradiated toward the work 3 from the laser welding heads 23, 25, 27, and 29 of the selected welding machines A to D.

  The oscillator control unit 30b has various functions as an overall control means for controlling the determination of the welding machines A to D that execute the welding process based on each signal. Specifically, as shown in FIG. 3, the oscillator control unit 30 b includes a storage unit 33, a welding machine determination unit 34, a normal completion determination unit 35, and a priority order determination unit 36. The memory | storage part 33 is comprised with memory and memorize | stores the energization priority for determining the priority of welding machine AD when multiple welding request signals Sr are detected.

  As shown in Tables Ta1 to Ta4 in FIG. 7, the storage unit 33 has a table composed of storage areas of the first area, the second area, the third area, and the fourth area in descending order of energization priority. ing. In the table Ta1 at the time of initial setting, the welding machine A is set in the first area, the welding machine B is set in the second area, the welding machine C is set in the third area, and the welding machine D is set in the fourth area. This means that the machines A, B, C, and D are ranked in order from the top. The number of each storage area corresponds to the number of welding machines. The welding machine determination means 34, normal completion determination means 35, and priority order determination means 36 are functions of a program executed by the CPU, and details thereof will be described later with reference to a control flowchart in a control method described later.

[Control method]
(Main flow)
Next, the operation and control method of the laser welding system 2 in the present embodiment will be described. FIG. 4 is a flowchart showing an example of a control procedure (main flow) executed by the oscillator control unit 30b in the present embodiment. For example, when power is supplied to the system from a power supply device (not shown), as shown in FIG. 4, in step S1, the oscillator control unit 30b prepares for operation of the laser oscillator 21 based on the oscillator operation preparation completion signal Sd. Determine if completed.

  When the preparation for operation of the laser oscillator 21 is completed (step S1: YES), the process proceeds to step S2 to execute a welding machine determination process. Since the details of the welding machine determination process are the main part of the present invention, the details will be described later. Step S2 corresponds to processing as a function of the welding machine determination means. On the other hand, when the operation preparation of the laser oscillator 21 is not completed (step S1: NO), the process of step S1 is repeated until the operation preparation is completed.

  And after the execution welding machine which performs welding is determined by welding machine determination processing, it progresses to step S3 and the setup of the laser oscillator 21 is instruct | indicated. The setup of the laser oscillator 21 means, for example, setting of a welding program number set for each of the welding machines A to D and switching of the beam switch 22. After the setup instruction, in step S4, it is determined whether the setup is completed. When the setup is completed (step S4: YES), the process proceeds to step S5, where the laser is oscillated and the workpiece 3 is irradiated with the laser from the predetermined laser welding heads 23, 25, 27, 29. On the other hand, when the setup of the laser oscillator 21 is not completed (step S4: NO), the process of step S4 is repeated until the setup is completed.

  After the laser irradiation, it is determined in step S6 whether or not laser welding has been normally completed. When the laser welding is normally completed (step S6: YES), the process proceeds to step S7, and the priority order changing process is performed. Since this priority order replacement process is a main part of the present invention together with the above-described welding machine determination process, details will be described later. Step S6 corresponds to the process as a function of the normal completion determination unit, and step S7 corresponds to the process as a function of the priority order determination unit.

  On the other hand, when the laser welding is not normally finished (step S6: NO), for example, an emergency stop button (not shown) installed in the welding line 1 is pressed by the operator, and any of the welding machines A to D that are performing the welding. Is stopped abnormally, the main routine is terminated without executing the priority order changing process. The main routine is also terminated after the priority order changing process. The main routine is repeatedly executed every predetermined time until the power of the laser welding system 2 is turned off.

(Welding machine decision processing)
Next, details of the welding machine determination process will be described with reference to FIG. First, in step S21, it is determined whether or not all 0s are set from the first area to the fourth area. “All 0s are set from the first area to the fourth area” means that the system is in an initial state when the system is started and the main routine is executed for the first time. If it is in the initial state (step S21: YES), initial setting is performed in step S22. In the initial setting, the welding machine A is stored in the first area, the welding machine B in the second area, the welding machine C in the third area, and the welding machine D in the fourth area.

  On the other hand, when the laser welding system 2 is not in the initial state (step S21: NO), for example, the main routine has already been executed once or more, and the welding machines A to D have already been set from the first area to the fourth area. In the case, the process proceeds to step S23 to recognize the welding requesting equipment. Here, the welding machines A to D that are output sources are recognized by receiving the output welding request signal Sr. Next, in step S24, it is determined whether or not the welding machine stored in the first area is in a welding request. “Welding is being requested” means that the welding request signal Sr is received. The same applies to the following steps (step S26, step S28, and step S30).

  If the welding machine stored in the first area is in a welding request (step S24: YES), the welding machine stored in the first area is selected as the execution welding machine in step S25. . On the other hand, if the welding machine stored in the first area is not in a welding request (step S24: NO), it is determined in step S26 whether the welding machine stored in the second area is in a welding request. to decide.

  If the welding machine stored in the second area is in a welding request (step S26: YES), the welding machine stored in the second area is selected as the execution welding machine in step S27. . On the other hand, if the welding machine stored in the second area is not in a welding request (step S26: NO), it is determined in step S28 whether the welding machine stored in the third area is in a welding request. to decide.

  If the welding machine stored in the third area is in a welding request (step S28: YES), the welding machine stored in the third area is selected as the execution welding machine in step S29. . On the other hand, if the welding machine stored in the third area is not in a welding request (step S28: NO), it is determined in step S30 whether the welding machine stored in the fourth area is in a welding request. to decide.

  If the welding machine stored in the fourth area is in a welding request (step S30: YES), the welding machine stored in the fourth area is selected as the execution welding machine in step S31. . On the other hand, when the welding machine stored in the fourth area is not in a welding request (step S30: NO), the process returns to step S3 of the main flow. Further, even after any of the welding machines A to D is selected (step S25, step S27, step S29, step S31), the process returns to step S3 of the main flow.

  As described above, in the welding machine determination process, it is determined whether or not welding request signals are output in order from the welding machines stored in the first area having the highest energization priority. If the welding machine is in a welding request, the welding machine is determined to perform welding. Thereby, welding with a high energization priority is preferentially performed. Even if the energization priority is high, if the welding request signal is not output due to an abnormal stop or the like and the welding is not being requested, whether or not the welding machine with the next highest energization priority is requesting welding Judgment is made to determine the execution welder. Thereby, welding is suitably performed from a welding machine with high energization priority, without stopping execution of welding as much as possible.

(Priority change processing)
Next, details of the priority order replacement processing will be described with reference to FIGS. As shown in the flowchart of FIG. 6, first, in step S71, the execution welder is extracted from the storage area.

  Next, it progresses to step S72 and the energization priority of the welding machine stored in the storage area lower than the empty area extracted at step S71 is incremented by one stage. Here, the empty area, that is, the storage area higher than the storage area of the welding machine in which welding is performed, is not changed and is maintained. In step S73, the execution welder is stored in the storage area having the lowest energization priority.

  Explaining with a specific example, for example, when the energization priority is in the order of A, B, C, and D and welding by the welding machine A is completed normally, as shown in the table Ta2 of FIG. Extract A from the first area. Next, as shown in the table Ta3, B is stored in the first area, C is stored in the second area, and D is stored in the third area. Finally, A is stored in the fourth area as shown in the table Ta4. That is, in this case, the energization priority of the welding machine A is changed from the first area to the fourth area, the energization priority of the welding machine B is changed from the second area to the first area, and the energization priority of the welding machine C is the third priority. From the area to the second area, the energization priority of the welding machine D is changed from the fourth area to the third area.

  Further, in another specific example, for example, as shown by Ta5 in FIG. 10, the energization priority is in the order of A, B, C, and D, and the welding machine A is abnormally stopped and the welding is being requested. If the welding by the welding machine B stored in the second area with the next highest energization priority is completed normally, the first area higher than the second area is maintained as it is, as indicated by Ta6. . That is, the energization priority of the welding machine A remains in the first area, and the energization priority of the welding machine B as the execution welding machine changes from the second area to the fourth area. Then, the energization priority of the welding machines C and D is increased by one, the energization priority of the welding machine C is changed from the third area to the second area, and the energization priority of the welding machine D is changed from the fourth area to the third area. It becomes an area.

  Here, to reach from the table Ta5 to the table Ta6, the welding machine A is stored in the first area, the welding machine B is extracted from the second area, and is stored in the third area lower than the second area. The order of the machine C and the welding machine D stored in the fourth area is moved up one by one, and the executed welding machine B is stored in the fourth area.

(Operation of the entire system)
Next, the operation of the entire system will be described with reference to FIGS. FIG. 8 is a time chart for explaining the operation of the entire system. There is no welding machine that stops abnormally during the operation, and welding request signals Sr are output from all the welding machines A to D, and the energization priority is in the initial state. The operation when set to is shown.

  First, from time t0 to t1, the welding request signal Sr is not output from each equipment control unit 24a, 26a, 28a, 30a. At time t1, the welding machines A to D output the welding request signal Sr all at once. In response to this, the oscillator control unit 30b executes the welding machine determination process as shown in step S2 of the main flowchart, determines the welding machine A having the highest energization priority as a welding machine to perform welding, and until t2. In the meantime, as shown in step S3 and step S4, the oscillator setup for welding by the welding machine A is performed.

  Next, from time t2 to t3, laser irradiation, that is, welding by the welding machine A is executed as shown in step S5. From time t3 to t4, as shown in step S6, step S7, and steps S1 to S4. The energization priority order changing process, the welding machine determination process, and the like are sequentially executed, and the oscillator setup for welding by the next welding machine B is performed. Next, from time t4 to t5, welding by the welder B is executed as shown in step S5.

  Similarly, if each of the welding machines A to D does not stop abnormally, welding by the welding machine C is performed from time t6 to t7 in order of energization priority, and welding machine D is performed from time t8 to t9. Perform welding with.

  Next, another pattern operation will be described with reference to FIGS. FIG. 9 is a time chart for explaining the operation of the entire system. When the welding machine A is abnormally stopped, welding by the welding machines B and C is executed first. The operation when is restored is shown. During the abnormal stop, the welding request signal Sr from the welding machine A is not output, and the welding request signal Sr is output when returning.

  First, from time t10 to t11, the welding request signal Sr is not output from each equipment control unit 24a, 26a, 28a, 30a. At time t11, the welding machines B, C, and D output the welding request signal Sr all at once. In response to this, the oscillator control unit 30b executes the welding machine determination process as shown in Step S2 of the main flowchart, and the welding machine with the highest energization priority among the welding machines that output the welding request signal Sr. B is determined as the execution welder. Then, welding by the welder B is executed from time t12 to t13, and welding by the welder C is executed from time t14 to t16.

  When welding machine A returns at time t15 while welding is being performed by welding machine C and welding request signal Sr is output from welding machine A, after welding is completed by welding machine C, from time t17. The welding by the welding machine A is performed before the welding machine D until t18.

  As shown in FIG. 10, in the table Ta5 in the initial setting, the energization priorities are in the order of A, B, C, and D. Then, when welding machine A is abnormally stopped and welding is not being requested, and B having the next highest energization priority is welded, the energization priority is A, C, D, B as shown in table Ta6. The order is changed.

  Here, as shown in the table Ta7 of FIG. 10, after the welding by the welding machine C is executed, the welding machine A is stored in the first area having the highest energization priority. Thereby, in the welding machine determination process (step S2) after the welding execution by the welding machine C, the welding machine A having the highest energization priority among the welding machines for which welding is requested is determined as the execution welding machine. Prior to welding by the welding machine A is executed. After welding is performed by the welding machine A, the energization priority is in the order of D, B, C, and A as shown in the table Ta8, and welding is performed by the welding machine D from time t19 to t20 as shown in FIG. Execute.

  Note that when the laser irradiation is completed normally or abnormally stopped for some reason, the welding request signal Sr is turned OFF. However, in the case of an abnormal stop, the energization priority order changing process shown in step S7 is not executed, so the energization priority order is maintained as it is.

[effect]
In this embodiment, in addition to the original welding order of the welding machines A to D in the order in which the welding line 1 is arranged from the upstream side to the downstream side, the energization priority order is based on the history of the welding machines that have been welded. I am trying to fluctuate. For example, in a system in which welding is performed sequentially from a welder that has output a welding request signal Sr in order to reduce the waiting time during an abnormal stop without priorities or history, the welding machine C is being executed as described above. Even when the welding machine A returns, the welding of the welding machine D that previously output the welding request signal Sr is executed.

  In this respect, in the present embodiment, if the welding request signal Sr of the welding machine A is output before the welding by the welding machine D is performed, the welding request signal Sr is output earlier than the welding machine D that has issued the welding request signal Sr. Perform welding by interrupting first. Thereby, it is possible to preferentially execute welding by a welding machine that is the most delayed in production.

  In this way, the energization priority order is determined each time welding is performed by one welding machine, based on the original welding order on the welding line 1 and the history of completion of welding execution. The entire system can be operated so that the original welding order is not broken as much as possible while automatically skipping the welding machine that has stopped abnormally. Thereby, the dispersion | variation in the production amount in each welding machine AD can be suppressed, and the production efficiency of the product completed as the welding line 1 whole can be improved by extension.

Second Embodiment
[Constitution]
Next, a second embodiment of the present invention will be described with reference to FIG. Since the system configuration of the second embodiment is the same as that of the first embodiment, description thereof will be omitted, and since the control flow is substantially the same, only different portions will be described. As shown in FIG. 11, in this embodiment, when the setup of the laser oscillator 21 is not completed in step S4 (step S4: NO), the process returns to step S2, and the welding machine determination process shown in step S2 is performed. And the point which repeatedly performs the process of the oscillator setup shown to step S3 differs from the said 1st Embodiment.

  According to the present embodiment, when the welding machine determination process is repeatedly performed while the laser oscillator 21 is performing the setup, the welding machine having a high energization priority returns and the welding request signal Sr is output. If the laser setup is not completed, the execution welder can be changed to a welder based on the latest energization priority. Since the laser setup time occurs not a little, this time can be used effectively.

<Other embodiments>
In each of the above embodiments, in the initial setting of step S22 shown in FIG. 5, the welding machines A to D are arranged in the order from the upstream to the downstream of the welding line 1, but it is not always necessary to set the order from the upstream to the downstream. Absent. For example, when the work 3 that has been welded by the welding machine A for some reason has already been mass-produced, the priority order may be lowered by one and B, A, C, and D may be set as initial settings. In this case, instead of step S22 shown in FIG. 5, for example, the welding machines A to D can be set in the storage areas of the table in the order input by the operator.

  In each of the above embodiments, the oscillator control unit 30b of the welding machine D is configured to function as a general control unit. However, a general control device may be provided separately from the controller 30.

In the priority order replacement process in each of the above embodiments, the procedure is to first extract the execution welder from the storage area and sequentially replace it, but the extraction and storage procedure in the storage area has been changed to reflect the welding execution history. What is necessary is just to change suitably.
The present invention is not limited to the embodiments described above, and can be implemented in various forms without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 1 ... Welding line 2 ... Laser welding system 3 ... Work 21 ... Laser oscillator 22 ... Beam switch (switching device)
23, 25, 27, 29 ... laser welding heads 24a, 26a, 28a, 30a ... equipment control unit (welding control means)
30b ... Oscillator control unit (overall control means)
33 ... Storage unit 34 ... Welding machine determination means 35 ... Normal completion judgment means 36 ... Priority order determination means A, B, C, D ... Welding machine

Claims (3)

Welding control means (24a, 26a, 28a, 30a) for outputting a laser welding head (23, 25, 27, 29) and a welding request signal (Sr) for requesting laser irradiation to the workpiece (3) by the laser welding head. A plurality of welding machines (A, B, C, D),
A laser oscillator (21) for irradiating a laser beam based on the welding request signal;
A switching device (22) for switching the optical path of the laser light emitted from the laser oscillator;
Based on the welding request signal, overall control means (30b) for controlling the welding machine, the laser oscillator and the switching device in an integrated manner;
A laser welding system (2) for carrying out welding on the workpiece by selectively energizing the welder while conveying the workpiece from upstream to downstream of the welding line (1),
The overall control means includes
A storage unit (33) for storing energization priority for determining the priority of the welding machine when a plurality of the welding request signals are detected;
When the welding request signal is input, a determination process for determining the welding machine having the highest energization priority among the welding machines from which the welding request signal is output as an execution welding machine that performs welding processing. Welding machine determination means (34) to perform;
Normal completion determination means (35) for determining whether or not the welding process by the execution welder has been normally completed;
When the normal completion determination means is a positive determination, the energization priority of the execution welding machine is set to the lowest, and the energization priority of the welding machine having the lower energization priority than the execution welding machine is advanced. And priority order determining means (36) for maintaining the energization priority of the welding machine having a higher energization priority than the execution welding machine;
A laser welding system comprising:   2. The laser welding system according to claim 1, wherein the energization priority is initially set in the storage unit so that the energization priority is changed from higher to lower in order of arrangement from the upstream to the downstream of the welding line. .   3. The laser welding system according to claim 1, wherein the welding machine determination unit repeatedly executes the determination process until setup for laser irradiation by the laser oscillator is completed. .

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