JP2011005535A - Composite welding equipment and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a stable welding quality at the start of welding, to prevent a recess and excessive growth of a crater at the end of welding, and to secure sufficient penetration, in composite welding comprising laser welding and arc welding.SOLUTION: Composite welding equipment includes: a wire feeding means 7, a welding power unit 10, a laser beam apparatus 1, and a control means 12 that controls the wire feeding means 7, the welding power unit 10, and the laser beam apparatus 1. The control means 12 generates a welding arc 11 at the start of welding by controlling the wire feeding means 7 and the welding power unit 10. When a current detection signal Sd is received, the control means 12 controls the laser beam apparatus 1 so as to output a laser beam 5. At the end of welding, the control means stops electric power for feeding a welding wire 9 by controlling the welding power unit 10 and, after feeding the welding wire 9 for a prescribed time by controlling the wire feeding means 7, stops the laser beam 5 and the welding wire 9.

Description

  In the present invention, an arc is generated between the welding wire and the welding position of the workpiece to be welded at the start of welding, and a laser beam is output immediately after detecting that the welding current has flowed. The present invention relates to a composite welding apparatus and a welding method for stopping a laser beam and a welding wire after power to be supplied is stopped and a welding wire is fed for a predetermined time.

  The combined welding method of laser welding and arc welding is used as a method capable of simultaneously obtaining high-speed laser welding and gap tolerance of arc welding. In actual welding, it is often necessary to improve the welding quality at the start and end of welding. As a control method at the start and end of welding of composite welding, there are those disclosed in Patent Documents 1 to 4.

  According to the method disclosed in Patent Document 1, it is effective to perform arc discharge after starting or simultaneously with starting laser irradiation, and to stop laser irradiation after or simultaneously with stopping arc discharge. In this method, if the laser irradiation at the end of welding is too longer than the arc discharge, the crater size at the end of welding may become too large, causing burnout or crater cracking depending on the material. There was a fear.

  According to the method disclosed in Patent Document 2, it is effective to start feeding the welding wire and outputting the welding voltage after irradiating the laser for a predetermined preceding irradiation time. Since this method requires prior irradiation with a laser before arc discharge starts, there is a possibility that the tact time becomes long in automatic welding with a large number of welding points.

  According to the methods disclosed in Patent Document 3 and Patent Document 4, after the laser output is stopped or reduced to a predetermined value at the welding end position, the welding end processing is mainly performed by arc welding, or the welding end is performed. After stopping the laser output just before the position, it is effective to advance the welding a little further and then perform the welding end process mainly by arc welding.

  In any of these methods, since crater treatment is mainly performed by arc welding, it is possible to prevent crater dents or overgrowth of the craters. There was a fear of not growing.

JP 2001-276888 A JP 2002-248571 A JP 2004-322159 A JP 2004-337934 A

  In view of the problems of the above-described conventional technology, the problem to be solved by the present invention is to detect that an arc current has flowed by generating an arc between the welding wire and the welding position of the work piece at the start of welding. A composite welding apparatus and a welding method for stopping the laser beam and the welding wire after stopping the power supplied to the welding wire at the end of welding and feeding the welding wire for a predetermined time after the welding is completed. It is to provide.

  In order to achieve the above object, a first invention of the present application includes a wire feeding means for feeding a welding wire in a composite welding apparatus that includes laser welding and arc welding and welds welding positions of workpieces simultaneously. A welding power source device that generates an arc between the welding wire and the welding position, a laser device that generates a laser beam and irradiates the welding position, the wire feeding means, the welding power source device, and the laser. A control means for controlling the apparatus, wherein the control means generates an arc by controlling the wire feeding means and the welding power source device at the start of welding, and indicates current detection indicating that a welding current has flowed. When the signal is received from the welding power supply device, the laser device is controlled to immediately output a laser beam, but at the end of welding, the welding power supply device is controlled to control the laser power supply device. Stops the power supplied to the contact wire, said after feeding the welding wire a predetermined time by controlling the wire feed means, a hybrid welding apparatus for stopping said welding wire and said laser beam.

  A second invention of the present application includes a laser welding and an arc welding, and controls a wire feeding means for feeding a welding wire in a composite welding apparatus that simultaneously welds the welding positions of the workpieces. A welding power source device that generates an arc between the welding position, a laser device that generates a laser beam and irradiates the welding position, and a control unit that controls the laser device and the welding power source device, The control means generates an arc by controlling the welding power source device at the start of welding, and receives the current detection signal indicating that a welding current has flowed from the welding power source device so as to immediately output a laser beam. When the welding is finished, the power supplied to the welding wire is stopped by controlling the welding power source device, and the welding wire is turned on at a predetermined time. After delivery, a hybrid welding apparatus for stopping said welding wire and said laser beam.

  3rd invention of this application is equipped with laser welding and arc welding, and in the composite welding apparatus which welds the welding position of a to-be-welded object simultaneously, the wire feeding means which feeds a welding wire, the said welding wire, and the said welding position A welding power source device that generates an arc between the laser beam, a laser device that generates a laser beam and irradiates the welding position, a control unit that controls the wire feeding unit, the welding power source device, and the laser device; The control means stops the power supplied to the welding wire by controlling the welding power source device at the end of welding, and feeds the welding wire for a predetermined time by controlling the wire feeding means. Then, the composite welding apparatus stops the laser beam and the welding wire.

  A fourth invention of the present application includes a laser welding and an arc welding, and controls a wire feeding means for feeding a welding wire in a composite welding apparatus that simultaneously welds the welding positions of the workpieces. A welding power source device that generates an arc between the welding position, a laser device that generates a laser beam and irradiates the welding position, and a control unit that controls the laser device and the welding power source device, The control means stops the power supplied to the welding wire by controlling the welding power supply device at the end of welding, stops the laser beam and the welding wire after feeding the welding wire for a predetermined time. It is a welding device.

  According to a fifth aspect of the present invention, in the first to fourth composite welding apparatuses, the wire feeding speed for a predetermined time for feeding the welding wire after stopping the power supply to the welding wire at the end of welding as the control means. This is a composite welding apparatus that controls at least one of the laser output and the laser output at a value different from that during energization.

  According to a sixth invention of the present application, in the first to fifth composite welding apparatuses, as control means, the power supplied to the welding wire is stopped at the end of welding, and the welding wire is stopped after being fed for a predetermined time. Further, it is a composite welding apparatus that stops the laser light after further irradiating the laser light for a predetermined time.

  A seventh invention of the present application is a composite welding apparatus using a semiconductor laser device, a YAG laser device, a fiber laser device, or a CO2 laser device as a laser device in the first to sixth composite welding devices.

  The eighth invention of the present application is a composite welding apparatus using the MAG welding power supply apparatus or the MIG welding power supply apparatus as the welding power supply apparatus in the first to seventh composite welding apparatuses.

  A ninth invention of the present application is a composite welding apparatus using a welding robot apparatus including an articulated manipulator as a control means in the first to eighth composite welding apparatuses.

  A tenth invention of the present application comprises a laser welding and an arc welding, and in a composite welding method in which welding positions of workpieces are welded simultaneously, a laser beam is output immediately after detecting the occurrence of an arc at the start of welding. However, this is a composite welding method in which the power supplied to the welding wire is stopped at the end of welding, the laser beam and the welding wire are stopped after feeding the welding wire for a predetermined time.

  The eleventh invention of the present application is a composite welding method comprising laser welding and arc welding, and simultaneously welding the welding positions of the workpieces. When welding is completed, the power supplied to the welding wire is stopped, and the welding wire is kept for a predetermined time. This is a composite welding method in which the laser beam and the welding wire are stopped after feeding.

  According to a twelfth aspect of the present invention, in the tenth or eleventh composite welding method, at the end of welding, after the power supply to the welding wire is stopped, the wire feeding speed and the laser output for a predetermined time for feeding the welding wire. Is controlled with a value different from that during energization.

  According to a thirteenth invention of the present application, in the tenth to twelfth composite welding methods, at the end of welding, the power supplied to the welding wire is stopped, the welding wire is supplied for a predetermined time, and then stopped. This is a composite welding method in which the laser beam is stopped after irradiation with light for a predetermined time.

  As described above, the present invention generates an arc between the welding wire and the welding position of the workpiece to be welded at the start of welding, and outputs a laser beam immediately after detecting that a welding current has flowed. Sometimes, the power supplied to the welding wire is stopped, the welding wire is fed for a predetermined time, and then the laser beam and the welding wire are stopped to obtain stable welding quality at the start of composite welding and at the end of welding. It prevents crater dents and overgrowth and ensures sufficient penetration.

The block diagram which shows the composite welding apparatus in Embodiment 1 of this invention. Timing chart showing operation in the first embodiment Timing chart showing operation in the first embodiment Explanatory drawing showing the principle that the welding arc is stabilized with the aid of laser irradiation Timing chart showing welding voltage in the first embodiment The block diagram which shows the composite welding apparatus in Embodiment 2 of this invention. The block diagram which shows the composite welding apparatus in Embodiment 3 of this invention. Timing chart showing operation in the third embodiment The block diagram which shows the composite welding apparatus in Embodiment 4 of this invention. The block diagram which shows the composite welding apparatus in Embodiment 5 of this invention. Timing chart showing operation in the fifth embodiment

  Since the object of the present invention described above can be achieved by using the configuration described in each claim as an embodiment, the configuration described in each claim will be described below together with the effect of the configuration in the configuration of each claim. Of these, specific terms that require explanation will be described in detail with reference to the embodiments of the present invention.

  The present invention relates to a composite welding apparatus that includes laser welding and arc welding, and simultaneously welds welding positions of an object to be welded, between wire feeding means for feeding a welding wire, and between the welding wire and the welding position. A welding power source device that generates an arc, a laser device that generates a laser beam and irradiates the welding position, a control unit that controls the wire feeding unit, the welding power source device, and the laser device, The control means generates an arc by controlling the wire feeding means and the welding power supply device at the start of welding, and immediately receives a current detection signal from the welding power supply device indicating that a welding current has flowed. The laser device is controlled so as to output laser light, but at the end of welding, the power supplied to the welding wire is stopped by controlling the welding power source device. In both cases, the welding wire is fed for a predetermined time by controlling the wire feeding means, and then the laser beam and the welding wire are stopped to obtain stable welding quality at the start of welding and at the end of welding. It prevents crater dents and overgrowth and ensures sufficient penetration.

  The present invention provides laser welding and arc welding, and controls a wire feeding means for feeding a welding wire in a composite welding apparatus that simultaneously welds welding positions of workpieces, and the welding wire and the welding A welding power supply device that generates an arc between the position, a laser device that generates a laser beam and irradiates the welding position, and a control unit that controls the laser device and the welding power supply device. The means generates an arc by controlling the welding power source device at the start of welding, and upon receiving a current detection signal from the welding power source device indicating that a welding current has flowed, the laser device outputs laser light immediately. However, at the end of welding, the welding power supply device is controlled to stop the power supplied to the welding wire, and the welding wire is By stopping the laser beam and the welding wire after feeding, stable welding quality is obtained at the start of composite welding, and crater dents and overgrowth are prevented at the end of welding to ensure sufficient penetration. be able to.

  The present invention also includes a wire feeding means for feeding a welding wire, a welding wire and a welding position, in a composite welding apparatus that includes laser welding and arc welding and welds welding positions of workpieces simultaneously. A welding power source device that generates an arc between the laser beam, a laser device that generates a laser beam and irradiates the welding position, a control unit that controls the wire feeding unit, the welding power source device, and the laser device. The control means stops the power supplied to the welding wire by controlling the welding power source device at the end of welding, and feeds the welding wire for a predetermined time by controlling the wire feeding means. After that, by stopping the laser beam and the welding wire, a stable welding quality is obtained at the start of welding, and a crater recess is formed at the end of welding. It is possible to ensure a sufficient penetration preventing large growth.

  The present invention also includes a laser welding and an arc welding, and controls a wire feeding means for feeding a welding wire in a composite welding apparatus that simultaneously welds welding positions of workpieces, and the welding wire and the welding A welding power supply device that generates an arc between the position, a laser device that generates a laser beam and irradiates the welding position, and a control unit that controls the laser device and the welding power supply device. The means stops the power supplied to the welding wire by controlling the welding power source device at the end of welding, and stops the laser beam and the welding wire after feeding the welding wire for a predetermined time. Stable welding quality can be obtained at the start of welding, and crater dents and overgrowth can be prevented at the end of welding to ensure sufficient penetration.

  Further, the present invention provides a control means that, when welding is finished, after power supply to the welding wire is stopped, at least one of a wire feeding speed and a laser output for a predetermined time for feeding the welding wire is different from that during energization. Can be controlled with different values.

  Further, according to the present invention, as a control means, the power supplied to the welding wire is stopped at the end of welding, the welding wire is stopped after being fed for a predetermined time, and further irradiated with laser light for a predetermined time, The light can be stopped.

  In the present invention, a semiconductor laser device, a YAG laser device, a fiber laser device, or a CO2 laser device can be used as the laser device. The output of the semiconductor laser, YAG laser, or CO2 laser may be a pulsed output.

  Moreover, this invention can use a MAG welding power supply device or a MIG welding power supply device as a welding power supply device. As a shielding gas for the MAG welding apparatus, CO2 or a mixed gas of CO2 and argon may be used. As the shielding gas for the MIG welding apparatus, argon gas or an argon mixed gas to which a small amount of CO 2 and O 2 is added may be used. The output of the MAG welding apparatus or MIG welding apparatus may be a pulsed output. About the irradiation position of the laser with respect to a welding arc, it can be set to the vicinity of the position where a welding wire contacts to-be-welded object, and can be set to the front vicinity of the welding direction of the molten pool produced by the arc generation means.

  Moreover, the present invention can use a welding robot apparatus provided with an articulated manipulator as a control means.

  Hereinafter, the composite welding apparatus and the welding method thereof according to the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram showing a composite welding apparatus according to Embodiment 1 of the present invention. A laser apparatus 1 includes a laser oscillator 2, a laser transmission unit 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 a single lens or a plurality of lenses. Reference numeral 7 denotes wire feeding means for feeding a welding wire 9 to a welding position of the workpiece 6 through a welding torch 8. A welding power source apparatus 10 generates a welding arc 11 between the welding wire 9 and the welding position of the workpiece 6 and supplies welding power (welding current and welding voltage) for maintaining the welding arc 11. is there. 12 inputs a welding activation signal Ws from the welding activation means 13, a time signal Tc from the time setting means 14, and a current detection signal Sd from the welding power supply apparatus 10, and a welding output signal Ia is input to the welding power supply apparatus 10; In addition, it is a control means for controlling the wire feed speed signal Wf while outputting the wire feed speed signal Wf to the wire feed means 7 and the laser output signal Pw to the laser apparatus 1.

  The operation of the above embodiment will be described with reference to FIGS. 2 and 3 are timing charts showing a welding start signal Ws, a wire feed speed signal Wf, a welding output signal Ia, a current detection signal Sd, and a laser output signal Pw. 2 shows the operation when the welding wire 9 and the workpiece 6 are not in contact at the start of welding, and FIG. 3 shows the operation when the welding wire 9 and the workpiece 6 are already in contact at the start of welding. It is a timing diagram.

  The operation at the start of welding will be described with reference to FIG. At time t1, the control unit 12 outputs the welding output signal Ia to the welding power source device 10 at the ON timing of the welding activation signal Ws from the welding activation unit 13, and starts supplying welding power to the welding wire 9, The wire feeding speed signal Wf0 is output to the wire feeding means 7 and controlled so that the welding wire 9 is fed toward the workpiece 6. When the welding wire 9 comes into contact with the workpiece 6 at time t2, a welding current flows and an arc is generated. Therefore, the welding power source apparatus 10 detects that the welding current has flowed, and a current detection signal Sd. Is output to the control means 12. The control means 12 immediately outputs the laser output signal Pw to the laser device 1 at the ON timing of the current detection signal Sd and controls to output the laser beam 5, and also performs wire feeding corresponding to the welding output signal Ia. The speed signal Wf1 is output to the wire feeding means 7 and composite welding is performed. The time Ts from the time point t1 to the time point t2 is the time until the welding wire 9 comes into contact with the workpiece 6 and no welding current flows, but a voltage called a no-load voltage is applied to the welding wire 9 and the welding target. This is a no-load voltage time applied between the object 6 and the object 6. The no-load voltage time Ts varies depending on the distance between the welding wire 9 and the workpiece 6 and the wire feed speed signal Wf0 at time t1. The wire feed speed signal Wf0 is set lower than the wire feed speed signal Wf1 after the welding current flows. This is because the welding wire 9 abruptly contacts the workpiece 6 to be welded. This is to prevent the arc start from getting worse. A welding current flows from time t2 and composite welding starts, but a welding current corresponding to the welding output Ia flows to the welding arc 11, and the welding voltage for maintaining the welding arc 11 stably is the welding wire 9 and the workpiece 6 to be welded. Between. The above composite welding is continued until time t3 when the welding start means 13 is operated and the end of welding is selected.

  The operation at the start of welding will be described with reference to FIG. The description of the same contents as the operation shown in FIG. 2 is omitted. At time t1, the control means 12 outputs the welding output signal Ia to the welding power source apparatus 10 and the wire feeding speed signal Wf to the wire feeding means 7 at the timing when the welding start signal Ws is turned ON. Then, the welding wire 9 is controlled to be fed. Since the welding wire 9 and the workpiece 6 are already in contact with each other, the control means 12 receives the current detection signal Sd from the welding power source device 10 at the same time as this operation starts. It outputs to the apparatus 1 and shifts to the composite welding, and controls the wire feeding means 7 with the wire feeding speed signal Wf1. The subsequent operation is the same as that shown in FIG.

  According to the above configuration and operation, the welding arc 11 immediately after the start of welding is stabilized with the aid of laser irradiation. The principle will be described with reference to FIG. In FIG. 4, (a) shows a stable arc form of conventional arc welding, (b) an unstable arc form at the start of conventional arc welding, and (c) a stable arc form at the start of welding in the present embodiment. It is shown schematically.

  At the moment when welding starts and the welding wire 9 comes into contact with the workpiece 6, a current having a high current density flows through the contact portion, the tip of the welding wire 9 melts in a very short time, and the welding arc 11 is transferred. . The stable welding arc 11 has a conical shape extending substantially on the extension line of the welding wire 9 (FIG. 4A). However, the welding arc 11 generated immediately after the start of welding is in a transient state until the stable state is reached, and is not necessarily stable from the beginning as shown in FIG. In some cases, the welding wire 9 may deviate significantly from the extension line as shown in FIG. If this state continues further, the arc breaks. In the present embodiment, the welding arc 11 is stabilized by the action of the laser-induced plasma 15.

  The reason will be described with reference to FIG. When the local temperature on the surface of the workpiece 6 is rapidly increased by laser irradiation and reaches the boiling point of the metal, intense evaporation occurs and metal vapor is formed. When the metal vapor further absorbs energy and ionizes, a laser-induced plasma 15 is formed. As the conductivity in the vicinity of the laser-induced plasma 15 increases, the welding arc 11 immediately after shifting from the short circuit is easily discharged through the region and stabilized.

  In FIG. 1, the welding power source apparatus 10 may directly detect the presence or absence of the welding current supplied to the welding wire 9 in order to detect that the welding current has flowed. You may detect indirectly with the welding voltage supplied between. As means for directly detecting the welding current, a CT (current transformer) or a hall element may be used. A method for indirectly detecting the welding current by detecting the welding voltage will be described with reference to FIG. FIG. 5 shows a voltage generated between the welding wire 9 and the workpiece 6 at the start of welding and its timing diagram. (A) and (b) correspond to the states of FIGS. 2 and 3, respectively. Vnol is a no-load voltage, Va is a welding voltage, and Vs is a very short-circuit voltage when the welding wire 9 contacts the workpiece 6. Vth1 is an intermediate voltage between the no-load voltage Vnol and the welding voltage Va, and Vth2 is an intermediate voltage between the welding voltage Va and the short-circuit voltage Vs. A method for detecting the presence or absence of the welding current using these voltages will be described. When the welding wire 9 and the workpiece 6 are in contact with each other and a current flows, in (a) the voltage changes from the no-load voltage Vnol to the welding voltage Va via the intermediate voltage Vth1, and in (b) the voltage changes from the short-circuit voltage Vs. The welding voltage Va changes via the intermediate voltage Vth2. Therefore, when (a) the voltage has passed the intermediate voltage Vth1 from the no-load voltage Vnol, (b) has detected the time when the intermediate voltage Vth2 has passed from the short-circuit voltage Vs, and this is the timing when the welding current flows. Can be considered.

  The operation when the welding activation means 13 is operated and the end of welding is selected will be described with reference to FIG. At time t <b> 3, the control unit 12 controls the welding power source device 10 to stop the power supplied to the welding wire 9 with the OFF timing of the welding activation signal Ws from the welding activation unit 13. Thereafter, the wire feeding means 7 is controlled so as to continue supplying the welding wire 9 to the workpiece 6 until the time t4 when the predetermined time Tc set by the time setting means 14 reaches, and the laser beam 5 is applied to the workpiece 6. The laser device 1 is controlled so as to continue irradiating the welding position. At time t4, the control unit 12 operates to stop the laser beam 5 by controlling the laser device 1 and to stop the welding wire 9 by controlling the wire control unit 7.

  In the present embodiment, as shown in FIG. 1, an arc is generated between the welding wire and the welding position of the workpiece to be welded at the start of welding, and laser light is output immediately after detecting that a welding current has flowed. However, at the end of welding, the power supplied to the welding wire is stopped, the welding wire is fed for a predetermined time, and then the laser beam and the welding wire are stopped to obtain stable welding quality at the start of composite welding. At the end of welding, crater dents and overgrowth can be prevented and sufficient penetration can be ensured.

(Embodiment 2)
FIG. 6 is a block diagram showing a composite welding apparatus in Embodiment 2 of the present invention. In the present embodiment, the welding power supply device 16 is used instead of the welding power supply device 10 and the control means 17 is used instead of the control means 12 in the first embodiment shown in FIG. The same configuration as in the embodiment shown in FIG. 1, the same operation timing (FIGS. 2 and 3), and the same operational effects are denoted by the same reference numerals, and detailed description thereof is omitted.

  The operation of the above configuration will be described with reference to FIG. At time t1, the control means 17 outputs a welding output signal Ia to the welding power source device 16 with the ON timing of the welding activation signal Ws. When receiving the welding output signal Ia, the welding power supply device 16 supplies welding power to the welding wire 9 and controls the wire feeding means 7 with the wire feeding speed signal Wf0 to move toward the workpiece 6. Then, the welding wire 9 is fed. At time t2, the welding power source 16 outputs a current detection signal Sd indicating that a welding current has flowed to the control means 17, and at the timing when the current detection signal Sd is turned ON, the wire feeding speed signal Wf1 is used as the wire feeding means. 7 is controlled. The control means 17 immediately outputs the laser output signal Pw to the laser device 1 at the ON timing of the current detection signal Sd, and performs composite welding by irradiating the workpiece 6 with the laser beam 5. At time t3, the control means 17 turns off the welding output signal Ia to the welding power supply device 16 with the OFF timing of the welding activation signal Ws. The welding power supply device 16 turns off the welding wire 9 with the OFF timing of the welding output signal Ia. The power to be supplied to is stopped, and the welding wire 9 is continuously fed to the workpiece 6 until the time t4 when the predetermined time Tc set by the time setting means 14 has elapsed. The control means 17 controls the laser device 1 so as to continue irradiating the welding position of the workpiece 6 with the laser beam 5 until time t4 when the predetermined time Tc has elapsed. At time t4, the control means 12 operates to control the laser device 1 so as to stop the laser beam 5, and the welding power source device 16 operates to control the wire control means 7 so as to stop the welding wire 9.

  In the present embodiment, by using the configuration shown in FIG. 6, it is possible to obtain the same effect as that of the above-described embodiment.

(Embodiment 3)
FIG. 7 is a block diagram showing a composite welding apparatus in Embodiment 3 of the present invention. In the present embodiment, the control means 18 is used instead of the control means 12 in the first embodiment shown in FIG. The operation timing chart is shown in FIG. The same configurations as those of the embodiment shown in FIG. 1, the same operations as those shown in FIG. 2, and the same operational effects are denoted by the same reference numerals, and detailed description thereof is omitted.

  The operation of the above configuration will be described with reference to FIG. At time t3, the control unit 18 controls the welding power source device 10 to stop the power supplied to the welding wire 9 with the OFF timing of the welding activation signal Ws. Thereafter, until the predetermined time Tc reaches t4, the wire feeding means 7 is controlled so as to continue feeding the welding wire 9 to the workpiece 6, and the welding position of the workpiece 6 is continuously irradiated with the laser beam 5. The laser device 1 is controlled. At time t4, the control unit 18 operates to stop the laser beam 5 by controlling the laser device 1 and to stop the welding wire 9 by controlling the wire control unit 7.

  In the present embodiment, by using the configuration shown in FIG. 7, it is possible to obtain the same effect as that of the above-described embodiment.

(Embodiment 4)
FIG. 9 is a block diagram showing a composite welding apparatus in Embodiment 4 of the present invention. In this embodiment, the control means 19 is used instead of the control means 17 in the second embodiment shown in FIG. The same configurations as those of the embodiment shown in FIG. 6, the same operation timing (FIG. 8), and the same operational effects are denoted by the same reference numerals, and detailed description thereof is omitted.

  The operation of the above configuration will be described with reference to FIG. At time t3, the control means 19 turns off the welding output signal Ia to the welding power source device 16 with the OFF timing of the welding start signal Ws, but the welding power source device 16 turns off the welding wire 9 with the OFF timing of the welding output signal Ia. The power supplied to is stopped, and the welding wire 9 is continuously fed to the workpiece 6 until time t4 when the predetermined time Tc has elapsed. The control means 19 controls the laser device 1 so as to continue to irradiate the welding position of the workpiece 6 with the laser beam 5 until time t4 when the predetermined time Tc has elapsed. At time t4, the control means 19 operates to control the laser device 1 and the welding power source 16 to stop the welding wire 9 by controlling the wire control means 7.

  In the present embodiment, by using the configuration shown in FIG. 9, it is possible to obtain the same effect as that of the above-described embodiment.

(Embodiment 5)
FIG. 10 is a block diagram showing a composite welding apparatus in Embodiment 5 of the present invention. In the third embodiment, in place of the control means 18 in the third embodiment shown in FIG. 7, the welding activation signal Ws of the welding activation means 13, the predetermined time signal Tc of the time setting means 14, and the predetermined time of the time setting means 20. The control means 21 which receives the signal Tb is used. The same configurations as those of the embodiment shown in FIG. 7, the same operation timing (FIG. 8), and the same operational effects are denoted by the same reference numerals, and detailed description thereof is omitted.

  The operation of the above configuration will be described with reference to FIG. FIG. 11 is a timing chart showing a welding start signal Ws, a wire feed speed signal Wf, an actual wire tip speed Wfr of the welding wire 9, a welding output signal Ia, a current detection signal Sd, and a laser output signal Pw. At time t3, the control means 21 turns off the welding output signal Ia to the welding power source device 10 with the OFF timing of the welding start signal Ws. The welding power source device 10 turns off the welding wire 9 with the OFF timing of the welding output signal Ia. The power to be supplied to is stopped, and the welding wire 9 is continuously fed to the workpiece 6 until the time t4 when the predetermined time Tc set by the time setting means 14 has elapsed. The control means 21 controls the laser device 1 so as to continue irradiating the welding position of the workpiece 6 with the laser beam 5 until time t4 when the predetermined time Tc has elapsed. At time t4, the control means 21 controls the wire control means 7 to stop the welding wire 9. In actual welding, the inertia of the wire feeding means 7 and the gap between the torch and the welding wire 9 exist, so that even if the wire feeding speed signal Wf becomes zero, the actual wire tip speed Wfr becomes zero. Depending on the magnitude of the wire feed speed signal Wf, the idle running time Ti from time t4 to time t5 is required. If the welding wire 9 fed to the workpiece 6 is not melted during the idling time Ti, the welding wire 9 may rush into the molten pool. In order to prevent this, at time t4, the control means 21 controls the laser device 1 so as to continue irradiating the welding position of the workpiece 6 with the laser beam 5 for a predetermined time Tb set by the time setting means 20. . When the point of time t5 when the tip of the welding wire 9 is completely stopped is reached and the point of time t6 is reached, the control means 21 controls the laser device 1 to stop the laser beam 5. The predetermined time Tb may be a time equal to or longer than the idle running time Tb.

  In the embodiment of the present invention, the control means 21 is used instead of the control means 18 of the third embodiment shown in FIG. 7, but in the first embodiment shown in FIG. 1, the control means 12 or the implementation shown in FIG. In the second embodiment, the control means 21 may be used instead of the control means 17 or the control means 19 in the fourth embodiment shown in FIG.

  In the present embodiment, by using the configuration shown in FIG. 10, the same effects as those of the above-described embodiment can be obtained, and the welding wire can be prevented from being pushed into the molten pool.

  As described above, the composite welding apparatus and its welding method according to the present invention generate an arc between the welding wire and the workpiece to be welded at the start of welding, and immediately after detecting that a welding current has flowed, However, at the end of welding, the power supply to the welding wire is stopped, the welding wire is fed for a predetermined time, and then the laser beam and the welding wire are stopped. In addition, at the end of welding, it is possible to prevent crater dents and overgrowth and ensure sufficient penetration, which can be applied to control of a composite welding apparatus.

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 feeding means 8 Torch 9 Welding wire 10 Welding power supply device 11 Welding arc 12 Control means 13 Welding start means 14 Time setting Means 15 Laser induced plasma 16 Welding power supply device 17 Control means 18 Control means 19 Control means 20 Time setting means 21 Control means Ws Welding start signal Wf Wire feed speed signal Wf0 Wire feed speed signal Wf1 Wire feed speed signal Wfr Wire tip Speed Ia Welding output signal Sd Current detection signal Pw Laser output signal Ts No load voltage time Tc Predetermined time Ti idle time Tb Predetermined time Vnol No load voltage Va Welding voltage Vs Short circuit voltage Vth1 Intermediate voltage Vth2 Intermediate voltage

Claims (13)

In a composite welding apparatus that comprises laser welding and arc welding, and welds the welding positions of the workpieces simultaneously,
Wire feeding means for feeding a welding wire, a welding power source device for generating an arc between the welding wire and the welding position, a laser device for generating laser light and irradiating the welding position, and the wire Control means for controlling the feeding means, the welding power source device and the laser device;
The control means generates an arc by controlling the wire feeding means and the welding power supply device at the start of welding, and immediately receives a current detection signal from the welding power supply device indicating that a welding current has flowed. The laser device is controlled to output a laser beam, and when welding is finished, the welding power source device is controlled to stop the power supplied to the welding wire, and the wire feeding means is controlled to control the welding. A composite welding apparatus that stops the laser beam and the welding wire after feeding the wire for a predetermined time. In a composite welding apparatus that comprises laser welding and arc welding, and welds the welding positions of the workpieces simultaneously,
A welding power source device for controlling a wire feeding means for feeding a welding wire, generating an arc between the welding wire and the welding position, a laser device for generating a laser beam and irradiating the welding position; Control means for controlling the laser device and the welding power source device;
The control means generates an arc by controlling the welding power source device at the start of welding, and upon receiving a current detection signal indicating that a welding current has flowed from the welding power source device, immediately outputs a laser beam. The laser device is controlled, and at the end of welding, the welding power supply device is controlled to stop the power supplied to the welding wire, and after feeding the welding wire for a predetermined time, the laser beam and the welding wire are Composite welding equipment to be stopped. In a composite welding apparatus that comprises laser welding and arc welding, and welds the welding positions of the workpieces simultaneously,
Wire feeding means for feeding a welding wire, a welding power source device for generating an arc between the welding wire and the welding position, a laser device for generating laser light and irradiating the welding position, and the wire Control means for controlling the feeding means, the welding power source device and the laser device;
The control means stops the power supplied to the welding wire by controlling the welding power source device at the end of welding, and after feeding the welding wire for a predetermined time by controlling the wire feeding means, A composite welding apparatus for stopping the laser beam and the welding wire. In a composite welding apparatus that comprises laser welding and arc welding, and welds the welding positions of the workpieces simultaneously,
A welding power source device for controlling a wire feeding means for feeding a welding wire, generating an arc between the welding wire and the welding position, a laser device for generating a laser beam and irradiating the welding position; Control means for controlling the laser device and the welding power source device;
The control means stops the power supplied to the welding wire by controlling the welding power supply device at the end of welding, stops the laser beam and the welding wire after feeding the welding wire for a predetermined time. Composite welding equipment. As a control means, after the power supply to the welding wire is stopped at the end of welding, at least one of the wire feeding speed and laser output for a predetermined time for feeding the welding wire is controlled with a value different from that at the time of energization. The composite welding apparatus according to claim 1, wherein: The control means stops the power supplied to the welding wire at the end of welding, stops the feeding wire after feeding it for a predetermined time, and further stops the laser light after irradiating with the laser light for a predetermined time. The composite welding apparatus according to claim 1. 7. The composite welding apparatus according to claim 1, wherein a semiconductor laser apparatus, a YAG laser apparatus, a fiber laser apparatus, or a CO2 laser apparatus is used as the laser apparatus. The composite welding apparatus according to claim 1, wherein a MAG welding power supply apparatus or a MIG welding power supply apparatus is used as the welding power supply apparatus. 9. The composite welding apparatus according to claim 1, wherein a welding robot apparatus having an articulated manipulator is used as the control means. In a composite welding method that includes laser welding and arc welding, and simultaneously welds the welding position of the work piece, a laser beam is output immediately after detecting the occurrence of an arc at the start of welding, but at the end of welding, a welding wire is output. A composite welding method in which the power supplied to is stopped, the welding wire is fed for a predetermined time, and then the laser beam and the welding wire are stopped. In a composite welding method that includes laser welding and arc welding, and simultaneously welds the welding position of the workpiece, the power supplied to the welding wire is stopped at the end of welding, and the welding wire is fed for a predetermined time, and then laser light And a welding method for stopping the welding wire. At the end of welding, after power supply to the welding wire is stopped, at least one of the wire feed speed and laser output for a predetermined time for feeding the welding wire is controlled with a value different from that at the time of energization. The composite welding method according to claim 10 or claim 11. 11. At the end of welding, the power supplied to the welding wire is stopped, the welding wire is stopped after being fed for a predetermined time, and further, the laser light is irradiated for a predetermined time, and then the laser light is stopped. Item 13. The composite welding method according to Item 12.