WO2015166793A1 - Procédé de commande de soudage à l'arc - Google Patents

Procédé de commande de soudage à l'arc Download PDF

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Publication number
WO2015166793A1
WO2015166793A1 PCT/JP2015/061367 JP2015061367W WO2015166793A1 WO 2015166793 A1 WO2015166793 A1 WO 2015166793A1 JP 2015061367 W JP2015061367 W JP 2015061367W WO 2015166793 A1 WO2015166793 A1 WO 2015166793A1
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WIPO (PCT)
Prior art keywords
period
welding
arc
output voltage
value
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PCT/JP2015/061367
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English (en)
Japanese (ja)
Inventor
章博 井手
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株式会社ダイヘン
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Priority to CN201580006777.1A priority Critical patent/CN105939811B/zh
Priority to JP2016515924A priority patent/JPWO2015166793A1/ja
Publication of WO2015166793A1 publication Critical patent/WO2015166793A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/06—Arrangements or circuits for starting the arc, e.g. by generating ignition voltage, or for stabilising the arc
    • B23K9/073—Stabilising the arc
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting

Definitions

  • the present invention generates a short-circuit period and an arc period by periodically repeating a forward feed period and a reverse feed period of the feed speed, and performs an arc control that performs constant voltage control so that the output of the welding power source becomes equal to the voltage target value.
  • the present invention relates to a welding control method.
  • a welding wire as a consumable electrode is fed at a constant speed, and an arc is generated between the welding wire and the base material to perform welding.
  • the welding wire and the base material are often in a welding state in which a short circuit period and an arc period are alternately repeated.
  • FIG. 4 is a waveform diagram in a welding method in which a forward feed period and a reverse feed period of a feeding speed are periodically repeated.
  • A shows the waveform of the feeding speed Fw
  • B shows the waveform of the welding current Iw
  • C shows the waveform of the welding voltage Vw
  • D shows a constant waveform.
  • the waveform of the output voltage setting signal Er which is a voltage target value of voltage control is shown.
  • the feed speed Fw is a forward feed period above 0 and a reverse feed period below. Forward feeding is feeding in the direction in which the welding wire is brought closer to the base material, and reverse feeding is feeding in a direction away from the base material.
  • the feeding speed Fw changes in a sine wave shape and has a waveform shifted to the forward feeding side. For this reason, the average value of the feeding speed Fw is a positive value, and the welding wire is fed forward on average.
  • the feeding speed Fw is 0 at time t1
  • the period from time t1 to t2 is the forward acceleration period
  • the maximum value of forward feeding at time t2 and the time t2 to
  • the period of t3 is the forward deceleration period
  • the period of time t3 to t4 is the reverse acceleration period
  • the period of time t4 to t5 is the reverse deceleration period It becomes.
  • the period from time t5 to t6 again becomes the normal feed acceleration period
  • the period from time t6 to t7 again becomes the normal feed deceleration period. Therefore, the period from time t1 to t3 is a normal transmission period, and the period from time t3 to t5 is a reverse transmission period.
  • the feeding speed Fw is repeated with time t1 to t5 as one cycle.
  • a constant voltage control welding power source is used for consumable electrode arc welding. This constant voltage control is performed by feedback control so that the output voltage of the welding power source becomes equal to a predetermined output voltage setting signal Er. As shown in FIG. 4D, since the output voltage setting signal Er is a constant value during welding, a constant output voltage is output by constant voltage control.
  • the feeding speed Fw is in the reverse feed period from time t3, so the welding wire is fed backward.
  • the short circuit is released by this reverse feed, and the arc is regenerated at time t31.
  • the reoccurrence of the arc often occurs before and after the maximum reverse feed at time t4.
  • the case occurs at time t31 during the reverse acceleration period before the maximum value of reverse feed. Therefore, the period from time t21 to t31 is a short circuit period.
  • the welding voltage Vw When the arc is regenerated at time t31, the welding voltage Vw rapidly increases to an arc voltage value of several tens of volts as shown in FIG. As shown in FIG. 5B, the welding current Iw starts to change from the maximum value during the short circuit period.
  • the feeding speed Fw is in the reverse feeding state, so that the welding wire is pulled up and the arc length is gradually increased.
  • the welding voltage Vw increases and the welding current Iw decreases because constant voltage control is performed. Therefore, during the arc period reverse feed period Tar from time t31 to t5, the welding voltage Vw gradually increases as shown in FIG. 3C, and the welding current Iw gradually decreases as shown in FIG. Become.
  • the next short circuit occurs at time t61 during the forward deceleration period from time t6 to t7.
  • the period from time t31 to t61 is the arc period.
  • the feed speed Fw is in the forward feed state, so the welding wire is fed forward and the arc length is gradually shortened.
  • the welding voltage Vw is reduced and the constant current control is performed, so that the welding current Iw is increased. Therefore, during the arc period normal feed period Tas from time t5 to t61, the welding voltage Vw gradually decreases as shown in FIG. 3C, and the welding current Iw gradually increases as shown in FIG. Become.
  • the average arc length differs when welding conditions such as joint shape, welding speed, and feed speed average value are different.
  • the average arc length is set to an appropriate value by adjusting the value of the output voltage setting signal Er, which is the voltage target value, and changing the average value of the welding voltage Vw.
  • the feeding speed Fw is a constant value
  • the welding wire is normally fed at a constant speed during the arc period, so that the arc length is continuously reduced. For this reason, even if the value of the output voltage setting signal Er is changed during the entire arc period, the welding state does not become unstable.
  • the arc period reverse feed period Tar in which the arc length is gradually increased and the arc period forward feed period Tas in which the arc length is gradually reduced There are two different states. At this time, if the output voltage setting signal Er is changed in order to adjust the average arc length to an appropriate value, the voltage target value in the arc period reverse feed period Tar and the voltage target value in the arc period forward feed period Tas are the same value. It will change as it is. Although the change state of the arc length is the opposite state, the voltage target value changes with the same value, so that there is a problem that the welding state becomes unstable.
  • An object of the present invention is to provide an arc welding control method in which the state does not become unstable.
  • the present invention provides: Arc welding control method for performing constant voltage control so that the output of the welding power source becomes equal to the output voltage setting value by periodically repeating the forward feed period and the reverse feed period of the feeding speed to generate a short circuit period and an arc period.
  • the output voltage set value is set to a first output voltage set value during the reverse feed period during the arc period, and is different from the first output voltage set value during the forward feed period during the arc period. 2 Set to the output voltage setting value.
  • the first output voltage setting value is automatically set according to an average value of the feeding speed. It is characterized by that.
  • the second output voltage setting value is set to an arbitrary value by a welding operator. It is characterized by that.
  • the present invention further includes an average welding voltage setting value for setting an average value of the welding voltage, detects the average value of the welding voltage, and the detected welding voltage average value is equal to the average welding voltage setting value. Feedback control of the second output voltage set value so that It is characterized by that.
  • the output voltage setting value suitable for each state of the state in which the arc length during the arc period reverse feed period gradually increases and the state in which the arc length during the arc period normal feed period gradually decreases ( Voltage target value).
  • the voltage target value may be changed to set the average arc length suitable for the welding conditions. The welding state does not become unstable.
  • FIG. 1 is a block diagram of a welding power source for carrying out an arc welding control method according to Embodiment 1 of the present invention. Hereinafter, each block will be described with reference to FIG.
  • the power supply main circuit PM receives a commercial power supply (not shown) such as a three-phase 200V, performs output control by inverter control or the like according to an error amplification signal Ea described later, and outputs an output voltage E.
  • This power supply main circuit PM is omitted in the drawing, but a primary rectifier that rectifies commercial power, a smoothing capacitor that smoothes the rectified direct current, an inverter circuit that converts the smoothed direct current to high frequency alternating current, and high frequency alternating current for welding A high-frequency transformer that steps down to an appropriate voltage value, a secondary rectifier that rectifies the stepped-down high-frequency alternating current into direct current, a modulation circuit that performs pulse width modulation control using the error amplification signal Ea as an input, and a pulse width modulation control signal are input.
  • a commercial power supply not shown
  • a smoothing capacitor that smoothes the rectified direct current
  • an inverter circuit that converts the smoothed direct current to high frequency alternating current
  • the reactor WL smoothes the output voltage E described above.
  • the inductance value of the reactor WL is, for example, 200 ⁇ H.
  • the feed motor WM receives a feed control signal Fc, which will be described later, and feeds the welding wire 1 at a feed speed Fw by periodically repeating forward feed and reverse feed.
  • a feed control signal Fc which will be described later
  • Fc feed control signal
  • the feeding motor WM may be installed near the tip of the welding torch 4. In some cases, two feed motors WM are used to form a push-pull feed system.
  • the welding wire 1 is fed through the welding torch 4 by the rotation of the feeding roll 5 coupled to the feeding motor WM, and an arc 3 is generated between the base metal 2 and the welding wire 1.
  • a welding voltage Vw is applied between the power feed tip (not shown) in the welding torch 4 and the base material 2, and a welding current Iw is conducted.
  • the welding voltage detection circuit VD detects the welding voltage Vw and outputs a welding voltage detection signal vd.
  • the short-circuit determination circuit SD receives the welding voltage detection signal vd as an input, determines that it is a short-circuit period when this value is less than a predetermined short-circuit determination value, and is at a high level.
  • a short circuit determination signal Sd that is determined to be low level is output. This short circuit discrimination value is set to about 15V.
  • the feed speed setting circuit FR outputs a feed speed setting signal Fr having a predetermined pattern in which the forward feed and the reverse feed are periodically repeated as will be described in detail with reference to FIG.
  • the feed speed setting signal Fr is 0 or more, it is a forward feed period, and when it is less than 0, it is a reverse feed period.
  • the feed control circuit FC receives the feed speed setting signal Fr and inputs a feed control signal Fc for feeding the welding wire 1 at a feed speed Fw corresponding to the set value to the feed motor WM. Output to.
  • the feed speed average value calculation circuit FAV receives the feed speed setting signal Fr, calculates an average value of the feed speed setting signal Fr, and outputs it as a feed speed average value signal Fav.
  • the first output voltage setting circuit ER1 receives the feed speed average value signal Fav as an input, and calculates and outputs the first output voltage signal Er1 by a predetermined function.
  • This function is a function representing the relationship between the value of the feed speed average value signal Fav and the value of the first output voltage setting signal Er1, and is calculated by experiment.
  • the second output voltage setting circuit ER2 is set to an arbitrary value by a welding operator, a robot control device (not shown) or the like, and outputs it as a second output voltage setting signal Er2.
  • the second output voltage setting signal Er2 is set so as to have an average arc length suitable for welding conditions.
  • the output voltage control setting circuit ECR receives the first output voltage setting signal Er1, the second output voltage setting signal Er2, the short circuit determination signal Sd, and the feed speed setting signal Fr as follows.
  • the output voltage control setting signal Ecr is a voltage target value for constant voltage control. 1) When the short circuit determination signal Sd is at a high level (short circuit period), the second output voltage setting signal Er2 is output as the output voltage control setting signal Ecr. 2) When the short circuit determination signal Sd is at the Low level (arc period) and the feed speed setting signal Fr is less than 0 (reverse feed period), it is determined that the arc period is in the reverse feed period Tar, The first output voltage setting signal Er1 is output as the output voltage control setting signal Ecr.
  • the output voltage detection circuit ED detects and smoothes the output voltage E and outputs an output voltage detection signal Ed.
  • the error amplifying circuit EA receives the output voltage control setting signal Ecr and the output voltage detection signal Ed, and amplifies an error between the output voltage control setting signal Ecr (+) and the output voltage detection signal Ed ( ⁇ ).
  • the error amplification signal Ea is output. By this circuit, the welding power source is controlled at a constant voltage.
  • FIG. 2 is a timing chart of each signal in the welding power source of FIG. 1 for explaining the arc welding control method according to the first embodiment of the present invention.
  • FIG. 4A shows the time change of the feeding speed Fw
  • FIG. 4B shows the time change of the welding current Iw
  • FIG. 4C shows the time change of the welding voltage Vw
  • FIG. ) Shows a time change of the output voltage control setting signal Ecr which is a voltage target value of the constant voltage control.
  • This figure corresponds to FIG. 4 described above, and the description of the same operation will not be repeated. This figure is different only in the operation of the output voltage control setting signal Ecr.
  • a description will be given with reference to FIG.
  • the feed speed Fw is a forward feed period above 0 and a reverse feed period below.
  • the feeding speed Fw changes in a sine wave shape and has a waveform shifted to the forward feeding side. For this reason, the average value of the feeding speed Fw is a positive value, and the welding wire is fed forward on average.
  • the change pattern of the feeding speed Fw may be triangular or trapezoidal.
  • the feeding speed Fw is 0 at time t1
  • the period from time t1 to t2 is the forward acceleration period
  • the maximum value of forward feeding at time t2 and the time t2 to
  • the period of t3 is the forward deceleration period
  • the period of time t3 to t4 is the reverse acceleration period
  • the period of time t4 to t5 is the reverse deceleration period It becomes.
  • the period from time t5 to t6 again becomes the normal feed acceleration period
  • the period from time t6 to t7 again becomes the normal feed deceleration period.
  • the repetition cycle of the forward feed and the reverse feed is set to a predetermined value.
  • the forward feed acceleration period from time t1 to t2 is 2.7 ms
  • the forward feed deceleration period from time t2 to t3 is 2.7 ms
  • the reverse feed acceleration period from time t3 to t4 is 2.3 ms.
  • the reverse feed deceleration period from time t4 to t5 is 2.3 ms
  • the maximum value of forward feed is 50 m / min
  • the maximum value of reverse feed is ⁇ 50 m / min.
  • the repetition cycle of forward feeding and reverse feeding is 10 ms
  • the average value of the feeding speed Fw is about 4 m / min (the average welding current is about 150 A).
  • the feeding speed Fw is in the reverse feed period from time t3, so the welding wire is fed backward.
  • the short circuit is released by this reverse feed, and the arc is regenerated at time t31.
  • the reoccurrence of the arc often occurs before and after the maximum reverse feed at time t4.
  • the case occurs at time t31 during the reverse acceleration period before the maximum value of reverse feed. Therefore, the period from time t21 to t31 is a short circuit period.
  • the output voltage control setting signal Ecr Er1 (first output voltage setting signal) as shown in FIG. 4D, and the welding voltage Vw is set as shown in FIG. Increases rapidly to an arc voltage value of several tens of volts. As shown in FIG. 5B, the welding current Iw starts to change from the maximum value during the short circuit period.
  • the next short circuit occurs at time t61 during the forward deceleration period from time t6 to t7.
  • the period from time t31 to t61 is the arc period.
  • the feed speed Fw is in the forward feed state, so the welding wire is fed forward and the arc length is gradually shortened.
  • the output voltage control setting signal Ecr Er2 (second output voltage setting signal).
  • the welding voltage Vw gradually decreases as shown in FIG. 3C, and the welding current Iw gradually increases as shown in FIG. Become.
  • Ecr Er2
  • the second output voltage setting signal Er2 is set by the welding operator, robot control device, or the like so as to have an average arc length suitable for welding conditions.
  • the output voltage set value (Ecr) is set to the first output voltage set value (Er1) during the reverse feed period during the arc period, and during the forward feed period during the arc period.
  • a second output voltage setting value (Er2) different from the first output voltage setting value is set.
  • the first output voltage set value is automatically set according to the average value of the feeding speed.
  • the second output voltage set value is set to an arbitrary value by the welding operator.
  • Embodiment 2 The invention of Embodiment 2 further includes an average welding voltage setting value for setting an average value of the welding voltage, detects the average value of the welding voltage, and the detected welding voltage average value is the average welding voltage setting value.
  • the second output voltage set value is feedback controlled so as to be equal to.
  • FIG. 3 is a block diagram of a welding power source for carrying out the arc welding control method according to Embodiment 2 of the present invention.
  • This figure corresponds to FIG. 1 described above, and the same reference numerals are given to the same blocks, and description thereof will not be repeated.
  • an average welding voltage setting circuit VAR, an average welding voltage detection circuit VAV, and an average voltage error amplification circuit EVA are added to FIG. 1, and the second output voltage setting circuit ER2 of FIG. It is a substitute for FER2.
  • VAR average welding voltage setting circuit
  • VAV average welding voltage detection circuit
  • EVA average voltage error amplification circuit
  • the average welding voltage setting circuit VAR outputs a predetermined average welding voltage setting signal Var.
  • the average welding voltage detection circuit VAV receives the welding voltage detection signal Vd, detects the average value of this signal, and outputs the average welding voltage detection signal Vav.
  • the average voltage error amplifying circuit EVA receives the average welding voltage setting signal Var and the average welding voltage detection signal Vav, and inputs the average welding voltage setting signal Var (+) and the average welding voltage detection signal Vav ( ⁇ ). The error is amplified and an average voltage error amplification signal Eva is output.
  • E0 is a predetermined initial value.
  • the value of the second output voltage setting signal Er2 is feedback-controlled by the above circuit so that the value of the average welding voltage detection signal Vav becomes equal to the value of the average welding voltage setting signal Var.
  • the timing chart of each signal in the welding power source of FIG. 3 for explaining the arc welding control method according to the second embodiment of the present invention is the same as FIG. 2 described above, description thereof will not be repeated.
  • the value of the second output voltage setting signal Er2 which is the value during the arc period normal feed period Tas of the output voltage control setting signal Ecr shown in FIG. 4D, is the average welding voltage detection value Vav.
  • the difference is that feedback control is performed so as to be equal to the value of the setting signal Var.
  • the pattern (waveform, amplitude, period, etc.) of the feed rate setting signal Fr may be changed in order to improve the welding quality while maintaining the same welding conditions such as the joint shape, welding speed, and feed rate average value. is there.
  • the pattern of the feed speed setting signal Fr changes, in the first embodiment, it is necessary to readjust the second output voltage setting signal Er2 in order to set the average arc length to an appropriate value.
  • the second output voltage setting signal Er2 is set so that the average welding voltage detection signal Vav becomes equal to the average welding voltage setting signal Var. Since the average arc length is maintained at an appropriate value because the feedback control is performed, readjustment of the average welding voltage setting signal Var is not necessary.
  • an average welding voltage set value for setting an average value of the welding voltage is further provided, the average value of the welding voltage is detected, and the detected welding voltage average value is the average welding voltage.
  • the second output voltage set value is feedback controlled so as to be equal to the set value.
  • the output voltage setting value suitable for each state of the state in which the arc length during the arc period reverse feed period gradually increases and the state in which the arc length during the arc period normal feed period gradually decreases ( Voltage target value).

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Arc Welding Control (AREA)

Abstract

La présente invention vise à améliorer la stabilité pendant un soudage à l'arc dans lequel une avance vers l'avant et une avance vers l'arrière d'un fil de soudage sont répétées de façon cyclique. A cet effet, l'invention porte sur un procédé de commande de soudage à l'arc, dans lequel procédé la période d'avance vers l'avant et la période d'avance vers l'arrière à une vitesse d'avance (Fw) sont répétées de façon cyclique, de façon à générer ainsi une période de court-circuit et une période d'arc, et la sortie d'une source d'alimentation de soudage est commandée à une tension constante de façon à être égale à une valeur de consigne de tension de sortie (Ecr). La valeur de consigne de tension de sortie (Ecr) est établie à une première valeur de consigne de tension de sortie (Er1) pendant la période d'avance vers l'arrière (Tar) dans la période d'arc, et est établie à une seconde valeur de consigne de tension de sortie (Er2), différente de la première valeur de consigne de tension de sortie (Er1), pendant la période d'avance vers l'avant (Tas) dans la période d'arc. Par conséquent, il est possible d'effectuer une commande de tension constante appropriée à des états individuels, à savoir, un état dans lequel la longueur d'arc augmente graduellement pendant la période d'avance vers l'arrière (Tar) dans la période d'arc, et un état dans lequel la longueur d'arc diminue graduellement pendant la période d'avance vers l'avant (Tas) de la période d'arc, de façon à améliorer ainsi la stabilité de soudage.
PCT/JP2015/061367 2014-04-28 2015-04-13 Procédé de commande de soudage à l'arc WO2015166793A1 (fr)

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CN201580006777.1A CN105939811B (zh) 2014-04-28 2015-04-13 电弧焊接控制方法
JP2016515924A JPWO2015166793A1 (ja) 2014-04-28 2015-04-13 アーク溶接制御方法

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CN106425026B (zh) * 2016-11-30 2018-02-27 唐山松下产业机器有限公司 电弧焊接设备、电弧焊接控制方法及装置
JP7222810B2 (ja) * 2019-05-29 2023-02-15 株式会社ダイヘン アーク溶接装置及びアーク溶接方法

Citations (5)

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Publication number Priority date Publication date Assignee Title
JPS6192784A (ja) * 1984-10-12 1986-05-10 Hitachi Seiko Ltd アーク溶接電源装置
WO2009051107A1 (fr) * 2007-10-16 2009-04-23 Daihen Corporation Procédé de commande d'amorçage d'arc
US20130180971A1 (en) * 2012-01-17 2013-07-18 Lincoln Global, Inc. Systems and methods to feed wire within a welder
JP2013146763A (ja) * 2012-01-20 2013-08-01 Daihen Corp アーク溶接システム
JP2013169555A (ja) * 2012-02-20 2013-09-02 Panasonic Corp アーク溶接制御方法およびアーク溶接装置

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Publication number Priority date Publication date Assignee Title
JP2009072826A (ja) * 2007-08-27 2009-04-09 Daihen Corp パルスアーク溶接制御方法
EP2402104B1 (fr) * 2009-07-29 2018-04-11 Panasonic Intellectual Property Management Co., Ltd. Procédé de soudage à l'arc et appareil de soudage à l'arc

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6192784A (ja) * 1984-10-12 1986-05-10 Hitachi Seiko Ltd アーク溶接電源装置
WO2009051107A1 (fr) * 2007-10-16 2009-04-23 Daihen Corporation Procédé de commande d'amorçage d'arc
US20130180971A1 (en) * 2012-01-17 2013-07-18 Lincoln Global, Inc. Systems and methods to feed wire within a welder
JP2013146763A (ja) * 2012-01-20 2013-08-01 Daihen Corp アーク溶接システム
JP2013169555A (ja) * 2012-02-20 2013-09-02 Panasonic Corp アーク溶接制御方法およびアーク溶接装置

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CN105939811B (zh) 2019-09-06
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