JP4952315B2 - Composite welding method and composite welding equipment - Google Patents

Description

  The present invention relates to a composite welding method and a composite welding apparatus for performing laser beam irradiation and arc welding on an object to be welded.

Since laser welding has a high energy density, it is possible to perform welding with a narrow heat-affected zone at high speed. However, if there is a gap between the workpieces, for example, at the butt joint, the laser beam may come out of the gap and the workpiece may not be welded. In order to overcome this problem, a composite welding method with consumable electrode type arc welding has been proposed (see, for example, Patent Document 1).
FIG. 8 is a block diagram showing a configuration of a conventional composite welding apparatus. Reference numeral 1 denotes a laser generating means, which comprises a laser oscillator 2, a laser transmission means 3, and a condensing optical system 4, and irradiates a welding position of a workpiece 6 with a laser beam 5. The laser transmission means 3 may be an optical fiber or a transmission system combined with a lens. The condensing optical system 4 may be composed of one or a plurality of lenses. A wire 7 is fed to the welding position of the workpiece 6 through the torch 9 by the wire feeding means 8. An arc generating means 10 controls the wire feeding means 8 at the start of welding, and feeds the wire 7 through the torch 9 toward the welding position of the work 6 to be welded. The welding arc 11 is controlled to be generated between the workpiece 6 and the wire 7 by the wire feeding means 8 at the end of welding, and the welding arc 11 is controlled to stop. Reference numeral 12 denotes a control means (not shown), which controls the irradiation start and end timing of the laser beam 5 generated from the laser generating means 1 after receiving a welding start or welding end command from the outside, and generates the arc. The discharge start and end timing of the welding arc 11 generated from the means 10 is controlled. The control means 12 may be configured using a computer, but may be a component, a device, an apparatus having a calculation function such as a computer, or a combination thereof. Further, a robot may be used as the control means 12. Although detailed description is omitted, when the robot is used, the condensing optical system 4 and the torch 11 can be fixed to the manipulator portion of the robot. Although not shown, the laser oscillator 2 outputs a predetermined laser output set in advance, but can receive a laser output signal set by the control means 12 and output it. The arc generating means 10 outputs a predetermined arc output value set in advance, similar to the laser generating means 1, but receives and outputs a signal of the arc output value set by the control means 12. be able to.
The operation of the composite welding apparatus configured as described above is as follows. At the start of welding, the control means 12 that has received a welding start command sends a laser welding start signal to the laser generating means 1 to start irradiation with the laser beam 5. The welding is started by sending an arc welding start signal to the arc generating means 10 and starting arc discharge. At the end of welding, the control means 12 receiving the welding end command sends a laser welding end signal to the laser generating means 1. At the same time, the irradiation of the laser beam 5 is terminated, and an arc welding end signal is sent to the arc generating means 10 to terminate the arc discharge, thereby terminating the welding.

  In the above-described composite welding method, how to arrange laser welding and arc welding is very important, and there have been many proposals. For example, one that has been made with a view to improving the melting rate of the work piece is that the interval between the laser irradiation and the arc discharge should be arranged at a predetermined interval so that the arc does not interfere with the laser. (See, for example, Patent Document 2). Further, as a thing made with a viewpoint in groove center position tracking control of groove welding, there is one that controls the distance between a laser irradiation point and an arc generation point by sensing a welding state (for example, a patent) Reference 3).

The above-described conventional proposal has been made from the viewpoint of improving the melting speed or copying control of the workpiece, but the laser beam is not directly involved with the wire and does not melt it. Therefore, the welding current in that case is almost the same as the welding current of arc welding, and the size of the molten pool is substantially determined by the size of the molten pool of arc welding (Non-patent Document 1). Therefore, the amount of heat input to the work piece is large, and there is a risk of causing large thermal deformation. In order to overcome this problem, the inventors of the present invention have already made a proposal to reduce the arc current by irradiating the laser beam directly onto the wire and melting it together with the arc, thereby reducing the size of the molten pool. (For example, see Japanese Patent Application No. 2006-280059 of an unpublished in-house application). However, since the proposal by the inventor of the present invention was made with a view to reducing the arc current, how to control the welding output of arc welding when the laser beam is applied to the wire is specifically described. It did not present the correct method.
JP 2002-336882 A JP 2002-346777 A JP 2007-920 A Katayama Seiji, Utsumi Rin, Mizutani Masami, Wang Shizunami, Fujii Koji, Penetration characteristics and porosity prevention mechanism in YAG laser / MIG hybrid welding of aluminum alloys, light metal welding, 44, 3 (2006)

  In view of the problems of the prior art, the problem to be solved by the present invention is to reduce the heat input to the workpiece by controlling the pulse frequency of pulse arc welding according to the distance between the laser and the arc, and the gap It is an object of the present invention to provide a composite welding method and a composite welding apparatus that improve tolerance.

In order to achieve the above object, the present invention provides a composite welding method for simultaneously performing pulse arc welding with the workpiece by feeding a wire to the welding position while irradiating the welding position of the workpiece with a laser beam. In
The optical axis and the central axis are arranged at a position where the optical axis of the laser beam and the central axis of the wire intersect, and an intersection of the optical axis and the workpiece and an intersection of the central axis and the workpiece. A composite welding method in which the pulse frequency is set to be lower as the distance between the laser and the arc is longer while the pulse current, the pulse width, and the base current in the pulse arc welding are kept at predetermined values according to the distance between the laser and the arc, A laser generating means for irradiating a welding position of a workpiece to be welded, a wire feeding means for feeding a wire to the welding position via a torch, and pulse arc welding to the wire and the workpiece to be welded A pulse arc generating means for supplying the electric power, and a control means for controlling the laser generating means and the pulse arc generating means,
The laser generating means and the torch have a configuration in which the optical axis and the central axis are arranged at a position where the optical axis of the laser beam and the central axis of the wire intersect, and the optical axis and the workpiece are Laser-arc distance setting means for setting the distance between the arc and the center axis and the intersection of the work piece and the laser-arc distance, and the set value of the laser-arc distance setting means, A pulse frequency setting means for setting the pulse frequency to be lower as the laser-arc distance is longer, and a pulse waveform setting means for setting the pulse waveform in pulse arc welding are provided.
The set values from the pulse frequency setting means and the pulse waveform setting means are input to the pulse arc generating means, and the distance between the laser and the arc is maintained while keeping the pulse current, the pulse width, and the base current in the pulse arc welding at predetermined values. This is a composite welding apparatus that lowers the pulse frequency as the length increases.

  In this way, the optical axis and the central axis are arranged at a position where the optical axis of the laser beam and the central axis of the wire intersect so as to directly irradiate the laser beam onto the wire to be welded, and a laser arc It is possible to reduce the heat input to the base material and improve the gap tolerance by welding by changing only the pulse frequency while keeping the pulse current, pulse width and base current at the predetermined values according to the distance between them. it can.

  As described above, the present invention arranges the optical axis and the central axis at a position where the optical axis of the laser beam and the central axis of the wire intersect so as to directly irradiate the laser beam to the wire to be welded. In addition, the heat input to the base metal is reduced by welding only by changing the pulse frequency while keeping the pulse current, pulse width, and base current at predetermined values according to the distance between the laser and arc, and the gap tolerance It is possible to improve.

(Embodiment)
FIG. 1 is a schematic diagram showing a configuration of a composite welding apparatus in an embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the place which has the structure, operation | movement, and effect similar to the content shown in FIG. 8, detailed description is abbreviate | omitted, and it demonstrates centering on a different part.

  In FIG. 1, a pulse arc generating means 13 is used in place of the arc generating means 10 of FIG. The pulse arc generating means 13 outputs a pulsed welding power consisting of a predetermined pulse current, a pulse width, a base current set by the pulse waveform setting means 14 and a pulse frequency set by a pulse frequency setting means 15 described later. The pulse arc welding is performed while generating the pulse arc 16 between the wire 7 and the workpiece 6. 18 is a laser output setting means for setting the laser output of the laser oscillator 2, 19 is a laser brightness input means for setting the laser brightness near the welding position A, and the laser output setting value from the laser output setting means 18 is The set value of the laser brightness is inputted from the laser brightness input means 19 to the pulse frequency setting means 15 respectively. The laser output setting unit 18 may also serve as the control unit 12. In this case, the configuration is changed so that the signal of the control means 12 is input to the pulse frequency setting means 15.

  The pulse frequency setting means 15 is a distance between the intersection of the optical axis of the laser beam 5 and the workpiece 6 and the intersection of the central axis of the wire 7 and the workpiece 6, that is, the laser-arc distance L 0 (FIG. 1 shows only a schematic diagram of the vicinity of the welding position A, the details of which will be described in FIG. 2 and subsequent figures.) And the pulse frequency is applied to the pulse arc generating means 13 in accordance with the laser-arc distance L0. Output.

  In actual pulse arc welding, the pulse frequency set by the pulse frequency setting means 15 varies depending on the laser-arc distance L0, the laser output, or the laser brightness.

  That is, the longer the laser-arc distance L0, the lower the pulse frequency, and the shorter the laser-arc distance L0, the higher the pulse frequency.

  Even if the laser-arc distance L0 is the same, the pulse frequency is set lower as the laser output becomes higher, and the pulse frequency is set higher as the laser output becomes lower.

  Even with the same laser output, the higher the laser brightness, the lower the pulse frequency, and the lower the laser brightness, the higher the pulse frequency.

  The principle of the pulse frequency setting method of the pulse frequency setting means 15 described above will be described with reference to FIGS.

  FIG. 2 shows an arrangement method (FIGS. 2 (a1) and 2 (b1)) of the laser beam 5 and the wire 7 in the vicinity of the welding position A of the composite welding apparatus according to the embodiment of the present invention and pulse arc welding corresponding thereto. It is a schematic diagram (FIG. 2 (a2), FIG.2 (b2)) of the pulse waveform which shows the pulse-shaped welding output of FIG.

  L1 and L2 are laser-arc distances, and both correspond to the laser-arc distance L0 in FIG. For the sake of explanation, it is assumed that the laser-arc distance L1 shown in FIG. 2 (a) is shorter than the laser-arc distance L2 shown in FIG. 2 (b). Reference numeral 9 a denotes a power supply chip that is attached to the tip of the torch 9 and supplies power to the wire 7. aa ′ is the optical axis of the laser beam 5, and bb ′ is the central axis of the wire 7. 100 and 101 are schematic diagrams of pulse waveforms of pulse arc welding corresponding to the laser-arc distance L1 and the laser-arc distance L2. F1 and F2 are the pulse frequencies of the pulse waveform 100 and the pulse waveform 101, respectively. Ip is a pulse current, tp is a pulse width, and Ib is a base current.

  In order to explain the operation of FIG. 2, it is necessary to explain the process in which the droplets are detached from the tip of the wire 7 and move to the welding position of the work piece 6. This will be described with reference to FIG. FIG. 3 is a schematic diagram showing a droplet separation / transfer mode in pulse arc welding. FIG. 4 is a schematic diagram showing a droplet detachment / transfer mode of composite welding. Since the pulse current Ip, the pulse width tp, and the base current Ib are the same as those in FIG. 2, their display is omitted.

  The pulse arc welding of FIG. 3 will be described. 102 is a pulse waveform of pulse arc welding, and F0 is the pulse frequency. In order to obtain good welding, the pulse current Ip, the pulse width tp, and the base current Ib are selected so that one droplet is usually transferred by one pulse, and the pulse frequency F0 of the pulse waveform 102 is selected. To do. This is a 1-pulse 1-drop transition. The operation will be described. At the timing (1), the base period is almost finished, and a very small amount of molten metal remains at the tip portion of the wire 7. Reference numeral 200 denotes a molten / unmelted boundary indicating a boundary between the molten metal and the unmelted portion of the wire 7. In the following description, in order to simplify the drawing, the melting / unmelting boundary is not shown from the timing (2). At timing (2), a pulse period starts and a wire end droplet 201, which is a molten metal, is formed at the tip of the wire 7 by the action of the pulse current Ip. At timing (3), a constriction 202 is generated on the wire end droplet 201 side near the melting / unmelting boundary 200 by the pinch action of the pulse current Ip in the latter half of the pulse period. Thereafter, the constriction 202 further grows, and at the timing (4) immediately after entering the base period, the wire end droplet 201 separates from the tip of the wire 7 to form a droplet 203. Thereafter, the droplet 203 moves to the welding position of the workpiece 6 through the timing (5) during the base period and until the timing (6) just before the end of the base period. Since the base current Ib is normally set low, the wire 7 hardly melts during the base period. Timing (6) immediately before the end of the base period is the same state as timing (1). The above process from timing (1) to timing (6) is repeated during welding to realize a 1-pulse 1-drop transition. As a result, good welding results with less spatter can be obtained.

  The composite welding of FIG. 4 will be described. 4 (a) and 4 (b) correspond to FIGS. 2 (a) and 2 (b), respectively (L1 <L2), and the pulse waveforms are 100 and 101, respectively. The same operations or functions as those in FIG. 3 are given the same symbols, and the description thereof is omitted. For simplification of the drawing, the display of the pulse current Ip, the pulse width tp, and the base current Ib is omitted. Similar to the pulse arc welding shown in FIG. 3, the pulse frequency must be determined so as to shift to one pulse and one drop in order to obtain basically good welding even in the composite welding.

  FIG. 4A will be described. For the sake of explanation, the description will be made from the timing (1) immediately after the start of the base period and immediately after the droplet is detached from the tip of the wire 7. At timing (1), reference numeral 204 denotes a droplet immediately after being detached from the tip of the wire 7. Reference numeral 205 denotes a melted / unmelted boundary indicating a boundary between a very small amount of molten metal remaining at the tip portion of the wire 7 immediately after detachment of the droplet and an unmelted portion of the wire 7. At timing (2), although it is during the base period, the surface of the tip portion of the wire 7 is melted by direct irradiation of the laser beam 5 although not shown in the figure. As the time increases, it melts to form the wire end droplet 206. Thereafter, the wire end droplet 206 continues to grow until just before the end of the base period (including timing (3)). Needless to say, the droplet 204 moves to the welding position of the workpiece 6 during this period. Thereafter, at the timing (4) when the pulse period starts, the action of the pulse current Ip also contributes to the melting of the wire 7, so that the size of the wire end droplet 206 further increases. At the timing (5) of the latter half of the pulse period, as in the case of pulse arc welding, a constriction 207 is generated on the wire end droplet 206 side near the melting / unmelting boundary 205 by the pinch action of the pulse current Ip. Thereafter, the constriction 207 grows, and at the timing (6) immediately after entering the base period, the wire end droplet 206 is detached from the tip of the wire 7 to form a droplet 208. This timing (6) is in the same state as the timing (1). Thereafter, the processes from timing (1) to timing (6) are repeated. Compared with FIG. 3, the size of the droplet 204 or 208 is larger than that of the droplet 203 at the time of pulse arc welding because the tip portion of the wire 7 is melted by direct irradiation of the laser beam 5 from the base period. Becomes larger. Therefore, the pulse frequency F1 for realizing the 1-pulse 1-drop transition is lower than the pulse frequency F0 at the time of the pulse arc welding shown in FIG.

  FIG. 4B will be described. For comparison, FIG. 4B shows the pulse waveform 100 of FIG. Reference numeral 209 denotes a droplet that has detached from the tip of the wire 7 immediately after the pulse period. (A timing (1)). 211 is a wire end droplet formed by melting the surface of the tip portion of the wire 7 directly irradiated with the laser beam 5 during the base period (timing (2)). Reference numeral 212 denotes a constriction generated on the wire end droplet 211 side near the melting / unmelting boundary 210 due to the pinch action of the pulse current Ip in the latter half of the subsequent pulse period (timing (5)). Reference numeral 213 denotes a droplet formed when the wire end droplet 211 is detached from the tip of the wire 7 at the timing (6) immediately after the base period is entered after the timing (5). 4 (b) is different from FIG. 4 (a) because the laser-arc distance L2 in FIG. 4 (b) is larger than the laser-arc distance L1 in FIG. 4 (a). Is that the range of direct irradiation of the laser beam 5 is widened. In this case, it is easily guessed that the amount of the wire 7 that can be melted even with the same laser output increases. As a result, even when the length of the base period is the same as that in FIG. 4A, the size of the wire end droplet 211 that is detached in the next pulse period increases in FIG. 4B. Therefore, the pulse frequency F2 for realizing the 1-pulse 1-drop transition is lower than the pulse frequency F1 shown in FIG. As a result, if the pulse current Ip, the pulse width tp, and the base current Ib are the same, the average value of the arc current is reduced when the pulse frequency is lowered from F1 to F2. When the arc current decreases, the heat input due to the arc current decreases, and the size of the molten pool due to the arc can be reduced (Japanese Patent Application No. 2006-280059 of an unpublished in-house application). When applied to joint welding, it is considered possible to widen the gap tolerance.

  The following can be said from the results of FIGS. Compared with pulse arc welding, the size of the droplet 204 or droplet 208 is larger than that of the droplet 203 at the time of pulse arc welding in the composite welding with the laser-arc distance L1. As a result, in order to maintain the 1-pulse 1-drop transition, it is necessary to set the pulse frequency F1 when the laser-arc distance is L1 to be lower than the pulse frequency F0 of pulse arc welding. On the other hand, when the distance between the laser and the arc increases from L1 to L2, the range in which the laser beam 5 can irradiate the tip portion of the wire 7 is widened. The size is larger than the droplet 204 or the droplet 208. Therefore, when the distance between the laser and the arc becomes long (L2), the pulse frequency F2 needs to be set lower than the pulse frequency F1.

In order to confirm the effect of the embodiment of the present invention, an A5356 wire is used for an A5052 aluminum alloy having a thickness of 2 mm, and a 2.7 kW YAG laser (the condensed diameter on the surface of the workpiece 6 is φ0). Composite welding). The pulse arc welding method used was a pulse MIG arc welding method. FIG. 5 shows a measurement example of the arc current and the pulse frequency when the distance between the laser and the arc is changed. FIG. 6 shows an example of measuring the arc current and voltage waveform when the laser-arc distance is changed using the same welding conditions as in FIG. The voltage waveform is collected between the energization part (not shown) of the torch 9 and the work piece 6 with the voltage drop of the energization cable removed as much as possible. When the distance between the laser and the arc is 0 mm, there is no relation between the laser beam 5 and the wire 7, so that the arc current is basically the same as that of the pulse MIG arc welding. On the other hand, the laser-arc distance was made longer than 0 mm, the arc current decreased, and the pulse frequency decreased. FIG. 7 shows a measurement example of the bead shape and a measurement of the gap tolerance when the composite welding method and the pulsed MIG arc welding method of the embodiment of the present invention are applied to the butt joint of the A5052 material. In the composite welding method of the present embodiment, since the arc current can be reduced as described above, a wide gap tolerance can be obtained as compared with the pulse MIG arc welding method. According to the result of visual observation of the welding state, as in the case of pulse MIG arc welding, the occurrence of spatter by the composite welding method of the present embodiment was very small.

  As described above, according to the embodiment of the present invention, the optical axis is placed at a position where the optical axis of the laser beam and the central axis of the wire intersect so as to directly irradiate the wire to be welded with the laser beam. The base material is welded by arranging the central axis and welding with the pulse current, the pulse width, and the base current being set to predetermined values while keeping the pulse current, pulse width, and base current at predetermined values. It is possible to reduce the heat input to and improve the gap tolerance.

  As described above, when the laser-arc distance is long with the same laser output, the melted wire is lengthened by direct irradiation of the laser beam during the base period, and a large droplet can be formed. In order to realize drop transition, it was necessary to set the pulse frequency low. Needless to say, increasing the laser power or increasing the laser brightness can increase the length of the wire that can be melted during the same length of base period, so the higher the laser power or laser brightness, the higher the pulse frequency. Must be set low. Conversely, it goes without saying that the pulse frequency needs to be set higher as the laser output or the laser brightness decreases.

  In the above description, pulse MIG arc welding has already been used as an example of pulse arc welding (FIGS. 5 to 7). Needless to say, it is desirable to use pulse MIG arc welding as an embodiment of the present invention. .

  Moreover, an aluminum alloy can be used for both the workpiece and the wire.

  As described above, according to the present invention, by setting the pulse frequency of pulse arc welding according to the distance between the laser and the arc, it is possible to reduce the heat input to the workpiece and improve the gap tolerance. A welding method and a composite welding apparatus can be provided.

The block diagram which shows the structure of the composite welding apparatus in embodiment of this invention Schematic diagram showing details of welding position vicinity A and a schematic diagram showing the corresponding pulse waveform Schematic diagram showing droplet detachment / transfer mode in pulse arc welding The schematic diagram which shows the droplet separation and transfer form of the composite welding of embodiment of this invention Diagram showing measurement example of arc current and pulse frequency when laser-arc distance is changed Diagram showing measurement example of arc current and voltage waveform when laser-arc distance is changed The figure which shows the example of the bead shape at the time of applying the composite welding method and pulse arc welding method of embodiment of invention to a butt joint, and a gap tolerance Block diagram showing the configuration of a conventional composite welding apparatus

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Laser generating means 2 Laser oscillator 3 Laser transmission means 4 Condensing optical system 5 Laser beam 6 To-be-welded object 7 Wire 8 Wire feeding means 9 Torch 9a Feeding tip 10 Arc generating means 11 Welding arc 12 Control means 13 Pulse arc generating means 14 Pulse waveform setting means 15 Pulse frequency setting means 16 Pulse arc 17 Laser / arc distance setting means 100 Pulse waveform 101 Pulse waveform 102 Pulse waveform 200 Melting / unmelting boundary 201 Wire end droplet 202 Constriction 203 Melting droplet 204 Melting droplet 205 Melted / unmelted boundary 206 Wire end droplet 207 Constriction 208 Melted droplet 209 Droplet 210 Melted / unmelted boundary 211 Wire end droplet 212 Constriction 213 Molten droplet A Near welding position L0 Distance between laser and arc L1 Distance between laser and arc L2 Leh Arc distance aa 'optical axis bb' central axis F0 pulse frequency F1 pulse frequency F2 pulse frequency Ib base current Ip pulse current tp pulse time

Claims (8)

In a composite welding method in which pulse arc welding is performed simultaneously with the workpiece by feeding a wire to the welding position while irradiating a laser beam to the welding position of the workpiece,
The optical axis and the central axis are arranged at a position where the optical axis of the laser beam and the central axis of the wire intersect, and an intersection of the optical axis and the workpiece and an intersection of the central axis and the workpiece. In accordance with the distance between the laser and the arc, the pulse welding, the pulse width and the base current in the pulse arc welding are kept at predetermined values, and the pulse frequency is set lower as the laser-arc distance is longer. In a composite welding method in which pulse arc welding is performed simultaneously with a workpiece by feeding a wire to the welding position while irradiating a laser beam to the welding position of the workpiece,
The optical axis and the central axis are arranged at a position where the optical axis of the laser beam and the central axis of the wire intersect, and an intersection of the optical axis and the workpiece and an intersection of the central axis and the workpiece. The longer the laser-arc distance is, the higher the laser output is, while the pulse current, pulse width, and base current in pulse arc welding are kept at the specified values. A composite welding method in which the frequency is set low.   The composite welding method according to claim 1 or 2, wherein the pulse frequency is set lower as the laser luminance is higher even with the same laser output.   The composite welding method according to claim 1, wherein pulse MIG arc welding is used as pulse arc welding.   The composite welding method according to any one of claims 1 to 4, wherein an aluminum alloy is used for both the workpiece and the wire. Laser generating means for irradiating a welding position of a workpiece to be welded, wire feeding means for feeding a wire to the welding position via a torch, and pulse arc welding to the wire and the workpiece to be welded A pulse arc generating means for supplying power; and a control means for controlling the laser generating means and the pulse arc generating means,
The laser generating means and the torch have a configuration in which the optical axis and the central axis are arranged at a position where the optical axis of the laser beam and the central axis of the wire intersect, and the optical axis and the workpiece are Laser-arc distance setting means for setting the distance between the arc and the center axis and the intersection of the work piece and the laser-arc distance, and the set value of the laser-arc distance setting means, A pulse frequency setting means for setting the pulse frequency to be lower as the laser-arc distance is longer, and a pulse waveform setting means for setting the pulse waveform in pulse arc welding are provided.
The set values from the pulse frequency setting means and the pulse waveform setting means are input to the pulse arc generating means, and the distance between the laser and the arc is maintained while keeping the pulse current, the pulse width, and the base current in the pulse arc welding at predetermined values. Composite welding equipment that lowers the pulse frequency as the length increases. Laser generating means for irradiating a welding position of a workpiece to be welded, wire feeding means for feeding a wire to the welding position via a torch, and pulse arc welding to the wire and the workpiece to be welded A pulse arc generating means for supplying power; and a control means for controlling the laser generating means and the pulse arc generating means,
The laser generating means and the torch have a configuration in which the optical axis and the central axis are arranged at a position where the optical axis of the laser beam and the central axis of the wire intersect, and the optical axis and the workpiece are Laser-arc distance setting means for setting a laser-arc distance that is a distance between the intersection and the intersection of the central axis and the workpiece; and laser output setting means for setting a laser output in the laser generation means; , The set value of the laser output setting means and the laser-arc distance setting means, the pulse frequency setting means for setting the pulse frequency lower as the laser-arc distance is longer, and as the laser output is higher, Provided with a pulse waveform setting means for setting a pulse waveform in pulse arc welding,
The set values from the pulse frequency setting means and the pulse waveform setting means are input to the pulse arc generating means, and the longer the laser-arc distance is, the pulse current, the pulse width, and the base current in the pulse arc welding are kept at predetermined values. Also, a composite welding device that lowers the pulse frequency as the laser output increases. 8. A laser brightness input means for setting the laser brightness of the laser beam is provided, the set value of the laser brightness is input to the pulse frequency setting means, and the pulse frequency is set lower as the laser brightness is higher. The composite welding apparatus as described.

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