WO2018139222A1 - アーク溶接制御方法 - Google Patents
アーク溶接制御方法 Download PDFInfo
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- WO2018139222A1 WO2018139222A1 PCT/JP2018/000677 JP2018000677W WO2018139222A1 WO 2018139222 A1 WO2018139222 A1 WO 2018139222A1 JP 2018000677 W JP2018000677 W JP 2018000677W WO 2018139222 A1 WO2018139222 A1 WO 2018139222A1
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- period
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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
- B23K9/095—Monitoring or automatic control of welding parameters
-
- 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
- B23K9/09—Arrangements or circuits for arc welding with pulsed current or voltage
-
- 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
-
- 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
- B23K9/124—Circuits or methods for feeding welding wire
-
- 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
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
Definitions
- the present invention provides an arc welding control in which the welding wire is made of aluminum or an aluminum alloy, the welding wire feeding speed is alternately switched between a forward feeding period and a reverse feeding period, and a short circuit period and an arc period are repeatedly welded. It is about the 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.
- current control is performed to detect a sign that an arc is generated from the short-circuit period and to rapidly reduce the welding current to several tens of A in order to reduce the amount of spatter generated. .
- the sign of arc generation is performed by detecting that the droplet is constricted to increase the resistance value of the droplet. For this reason, this current control is called constriction detection control.
- the material of the welding wire is aluminum or an aluminum alloy (hereinafter referred to as an aluminum material)
- the resistance value is small, it becomes difficult to detect the occurrence of constriction due to the increase in the resistance value. For this reason, it is not possible to perform necking detection control that detects a sign that an arc is generated during a short-circuit period and rapidly reduces the welding current. As a result, there is a problem that the amount of spatter generated increases.
- the amount of spatter can be reduced in the welding method in which the welding wire is made of aluminum or an aluminum alloy and the welding wire feeding speed is alternately switched between the forward feeding period and the reverse feeding period.
- an arc welding control method is such that a welding wire is made of aluminum or an aluminum alloy, and the feeding speed of the welding wire is alternately switched between a forward feed period and a reverse feed period.
- the arc welding control method of repeatedly welding the short circuit period and the arc period Controlling the welding current so that the average value of the maximum value of the welding current during the short-circuiting period is 150 A or less, It is characterized by this.
- the arc welding control method of the present disclosure is characterized in that the reverse feed peak value during the reverse feed period is set so that the average value of the time length of the short-circuit period is 7 ms or less.
- the arc welding control method of the present disclosure is characterized in that the absolute value of the reverse feed peak value is set to at least 40 m / min.
- the arc welding control method of the present disclosure detects an average value of the time length of the short circuit period, and the reverse feed period so that the average value of the time length of the short circuit period becomes equal to a predetermined short circuit time set value.
- the reverse peak value in the feedback control is performed.
- the arc welding control method of the present disclosure detects an average value of the time length of the short circuit period, and reverse feed deceleration period so that the average value of the time length of the short circuit period becomes equal to a predetermined short circuit time set value. Is feedback-controlled.
- the arc welding control method of the present disclosure controls the welding current during the short-circuit period to a predetermined initial current value during a predetermined initial period, and thereafter to increase with time, and to control the initial current.
- the period is set to 1.5 ms or more.
- the amount of spatter can be reduced in the welding method in which the welding wire is made of aluminum or an aluminum alloy and the welding wire feeding speed is alternately switched between the forward feeding period and the reverse feeding period. .
- 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.
- a commercial power supply such as a three-phase 200V
- the power main circuit PM is driven by a primary rectifier that rectifies commercial power, a smoothing capacitor that smoothes the rectified direct current, and the error amplification signal Ea that converts the smoothed direct current to a high-frequency alternating current.
- An inverter circuit a high-frequency transformer that steps down the high-frequency alternating current to a voltage value suitable for welding, and a secondary rectifier that rectifies the stepped-down high-frequency alternating current into direct current.
- the reactor WL smoothes the output voltage E described above.
- the inductance value of the reactor WL is, for example, 100 ⁇ 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 alternately repeating forward feed and reverse feed.
- a motor with fast transient response is used as the feed motor WM.
- 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 material of the welding wire 1 and the base material 2 is aluminum or an aluminum alloy.
- the output voltage setting circuit ER outputs a predetermined output voltage setting signal Er.
- the output voltage detection circuit ED detects and smoothes the output voltage E and outputs an output voltage detection signal Ed.
- the voltage error amplification circuit EV receives the output voltage setting signal Er and the output voltage detection signal Ed, and amplifies an error between the output voltage setting signal Er (+) and the output voltage detection signal Ed ( ⁇ ).
- the voltage error amplification signal Ev is output.
- the current detection circuit ID detects the welding current Iw and outputs a current detection signal Id.
- the voltage detection circuit VD detects the welding voltage Vw and outputs a voltage detection signal Vd.
- the short-circuit determination circuit SD receives the voltage detection signal Vd as described above, and when this value is less than a predetermined short-circuit determination value (about 10 V), it determines that the short-circuit period is in effect and becomes a High level.
- a short circuit determination signal Sd which is determined to be in the arc period and becomes Low level is output.
- the forward feed acceleration period setting circuit TSUR outputs a predetermined forward feed acceleration period setting signal Tsur.
- the forward feed deceleration period setting circuit TSDR outputs a predetermined forward feed deceleration period setting signal Tsdr.
- the reverse acceleration period setting circuit TRUR outputs a predetermined reverse acceleration period setting signal Trur.
- the reverse feed deceleration period setting circuit TRDR outputs a predetermined reverse feed deceleration period setting signal Trdr.
- the forward feed peak value setting circuit WSR outputs a predetermined forward feed peak value setting signal Wsr.
- the reverse peak value setting circuit WRR outputs a predetermined reverse peak value setting signal Wrr.
- the feed speed setting circuit FR includes the forward feed acceleration period setting signal Tsur, the forward feed deceleration period setting signal Tsdr, the reverse feed acceleration period setting signal Trur, the reverse feed deceleration period setting signal Trdr, The forward feed peak value setting signal Wsr, the reverse feed peak value setting signal Wrr and the short circuit determination signal Sd are input, and the feed speed pattern generated by the following processing is output as the feed speed setting signal Fr.
- 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.
- Feed speed setting signal Fr that linearly accelerates from 0 to a positive feed peak value Wsp determined by a forward feed peak value setting signal Wsr during the forward feed acceleration period Tsu determined by the forward feed acceleration period setting signal Tsur. Is output.
- the feed speed setting signal Fr for maintaining the forward feed peak value Wsp is output.
- the short-circuit determination signal Sd changes from the Low level (arc period) to the High level (short-circuit period)
- a feed speed setting signal Fr that linearly decelerates to 0 is output. 4) Subsequently, during the reverse feed acceleration period Tru determined by the reverse feed acceleration period setting signal Trur, the feed speed that linearly accelerates from 0 to the negative reverse feed peak value Wrp determined by the reverse feed peak value setting signal Wrr. A setting signal Fr is output. 5) Subsequently, during the reverse feed peak period Trp, the feed speed setting signal Fr that maintains the reverse feed peak value Wrp is output.
- the feed control circuit FC receives the feed speed setting signal Fr and receives a feed control signal Fc for feeding the welding wire 1 at a feed speed Fw corresponding to the value of the feed speed setting signal Fr. It outputs to said feed motor WM.
- the initial period setting circuit TIR outputs a predetermined initial period setting signal Tir.
- the initial current setting circuit IIR outputs a predetermined initial current setting signal Iir.
- the current increase rate setting circuit DIR outputs a predetermined current increase rate setting signal Dir.
- the current control setting circuit ICR receives the short-circuit determination signal Sd, the initial period setting signal Tir, the initial current setting signal Iir, and the current increase rate setting signal Dir as follows, and performs the following processing.
- a setting signal Icr is output. 1)
- the initial current setting signal Iir is output as the current control setting signal Icr during the initial period Ti determined by the initial period setting signal Tir from the time when the short circuit determination signal Sd changes to the High level (short circuit period).
- a current control setting signal Icr that increases with time at an increase rate Di determined by the current increase rate setting signal Dir from the value of the initial current setting signal Iir is output.
- the short-circuit determination signal Sd changes to the low level (arc period)
- the current control setting signal Icr having a predetermined small current value is output.
- the current error amplifier circuit EI receives the current control setting signal Icr and the current detection signal Id as inputs, amplifies the error between the current control setting signal Icr (+) and the current detection signal Id ( ⁇ ), and An error amplification signal Ei is output.
- the small current period circuit STD receives the short-circuit determination signal Sd as described above, and goes to a high level when a predetermined current drop time elapses from when the short-circuit determination signal Sd changes to a low level (arc period).
- a small current period signal Std which becomes Low level is output.
- the power supply characteristic switching circuit SW receives the current error amplification signal Ei, the voltage error amplification signal Ev, the short circuit determination signal Sd, and the small current period signal Std as input, and performs the following processing to obtain an error amplification signal.
- Ea is output. 1) When the short circuit determination signal Sd is at the High level (short circuit period), the current error amplification signal Ei is output as the error amplification signal Ea. 2) When the short circuit determination signal Sd changes to the low level (arc period), the voltage error amplification signal Ev is output as the error amplification signal Ea. 3) During the subsequent arc period, the current error amplification signal Ei is output as the error amplification signal Ea during the period when the small current period signal Std becomes High level.
- the characteristics of the welding power source are constant current characteristics during the short circuit period and the small current period, and constant voltage characteristics during the other arc periods.
- FIG. 2 is a timing chart of each signal in the welding power source of FIG. 1 showing the arc welding control method according to Embodiment 1 of the present invention.
- A shows the time change of the feeding speed Fw
- B shows the time change of the welding current Iw
- C shows the time change of the welding voltage Vw
- D Shows a time change of the short circuit determination signal Sd
- FIG. 9E shows a time change of the small current period signal Std.
- the feed speed Fw shown in FIG. 6A is controlled to the value of the feed speed setting signal Fr output from the feed speed setting circuit FR of FIG.
- the feed speed Fw is determined by the forward feed acceleration period Tsu determined by the forward feed acceleration period setting signal Tsur in FIG. 1, the forward feed peak period Tsp that continues until a short circuit occurs, and the forward feed deceleration period setting signal Tsdr in FIG.
- the reverse transmission period Tsd, the reverse acceleration period Tru determined by the reverse acceleration period setting signal Trur in FIG. 1, the reverse peak period Trp that continues until the arc is generated, and the reverse transmission determined by the reverse deceleration period setting signal Trdr in FIG. It is formed from the deceleration period Trd.
- the forward peak value Wsp is determined by the forward peak value setting signal Wsr in FIG. 1
- the backward peak value Wrp is determined by the backward peak value setting signal Wrr in FIG.
- the feed speed setting signal Fr has a feed pattern that changes in a substantially positive and negative trapezoidal waveform.
- the feed speed Fw enters a predetermined reverse feed acceleration period Tru from time t2 to t3, and accelerates from 0 to the reverse feed peak value Wrp. During this period, the short circuit period continues.
- the reverse feed acceleration period Tru 1 ms is set.
- the feed speed Fw enters the reverse peak period Trp and becomes the reverse peak value Wrp as shown in FIG.
- the reverse feed peak period Trp continues until an arc occurs at time t4. Therefore, the period from time t1 to t4 is a short circuit period.
- the reverse transmission peak period Trp is not a predetermined value, but is about 4 ms.
- the welding current Iw during the short-circuit period from time t1 to t4 becomes the initial current Ii determined by the initial current setting signal Iir during the initial period Ti determined by the initial period setting signal Tir. Thereafter, the welding current Iw increases with time at an increase rate Di determined by the current increase rate setting signal Dir.
- the routine proceeds to a predetermined forward feed acceleration period Tsu at times t5 to t6.
- the feed speed Fw is accelerated from 0 to the normal feed peak value Wsp as shown in FIG.
- the arc period continues.
- the normal feed acceleration period Tsu 1 ms is set.
- the feed speed Fw enters the normal feed peak period Tsp as shown in FIG.
- the arc period continues during this period.
- the forward feed peak period Tsp continues until a short circuit occurs at time t7. Therefore, the period from time t4 to t7 is the arc period.
- the operation returns to the operation at time t1.
- the forward feed peak period Tsp is not a predetermined value, but is about 4 ms.
- the forward peak value Wsp is set to 30 to 50 m / min, for example.
- the welding voltage Vw rapidly increases to an arc voltage value of several tens of volts as shown in FIG.
- the welding current Iw becomes a value that changes according to the arc load because the welding power source has a constant voltage characteristic. During this period, melting of the welding wire is promoted and droplets are formed.
- the small current period signal Std changes to the high level as shown in FIG.
- the welding power source is switched from the constant voltage characteristic to the constant current characteristic.
- the welding current Iw is reduced to a predetermined small current value (about 60 A) and is maintained until time t7 when a short circuit occurs.
- the welding voltage Vw also decreases as shown in FIG.
- the small current period signal Std returns to the Low level when a short circuit occurs at time t7. Since the current drop time is set to about 5 ms, the timing at time t61 is during the forward feed peak period Tsp. The reason for providing the small current period is to reduce spatter generation by reducing the value of the welding current Iw when a short circuit occurs at time t7.
- the material of the welding wire and the base material is aluminum or an aluminum alloy.
- the welding current Iw is controlled so that the average value of the maximum values of the welding current Iw during the short circuit period is 150 A or less. Short circuit occurs about 80 times per second.
- the average value is a value obtained by detecting the maximum value of the welding current Iw during each short-circuit period and calculating the average value of the maximum value during the period in which welding is performed or for each unit time.
- the welding current Iw is controlled by adjusting the initial period Ti, the initial current Ii, or the increase rate Di. As described above, when the material of the welding wire is an aluminum material, the necking detection control cannot be performed.
- the spatter generation amount can be reduced by setting the average value of the maximum value of the welding current Iw during the short circuit period to 150 A or less.
- the material of the welding wire is steel or stainless steel, this value is 350 A or more. Such a large value is to prevent the welding state from becoming unstable.
- the welding wire is forwardly fed and reversely fed, the stability of the welded state is maintained even when the average value is reduced when the material is an aluminum material. Furthermore, it is more preferable that the average value is 100 A or less in order to reduce sputtering.
- Embodiment 1 it is preferable to set the reverse peak value Wrp during the reverse period so that the average value of the time length of the short circuit period is 7 ms or less. Since the welding current Iw is controlled so that the average value of the maximum value of the welding current Iw during the short-circuiting period becomes small, the droplet transfer time becomes long and the short-circuiting period becomes long. When the short-circuit period is long, the time ratio of the arc period is small, and the amount of heat input to the base material is small. As a result, the bead shape is affected. When the absolute value of the reverse feed peak value Wrp is increased, the welding wire is pulled up at high speed, so that the short circuit period can be shortened.
- the average value of the short-circuit period is 7 ms or less, the influence on the bead shape is reduced.
- the greater the absolute value of the reverse feed peak value Wrp the greater the load on the feed motor WM.
- the average value of the short-circuit period is more preferably 5 ms or less.
- the absolute value of the reverse feed peak value Wrp is preferably at least 40 m / min.
- the welding current Iw during the short-circuit period is controlled to a predetermined initial current Ii during a predetermined initial period Ti, and thereafter controlled to increase with time, and the initial period Ti Is preferably set to 1.5 ms or more.
- the initial period Ti is set to 1 ms or less when the material of the welding wire is steel or stainless steel.
- the initial period Ti is set to 1.5 ms or more when the material of the welding wire is steel or stainless steel.
- the initial period Ti is set to 1.5 ms or more, the droplet transfer state can be made smoother and the welding state can be stabilized.
- the initial current Ii is set to about 30 to 70A.
- the increase waveform of the welding current Iw during the short-circuit period is exemplified in FIG.
- the increasing waveform of the welding current Iw may be a two-stage broken line shape or a curved shape.
- the invention of the second embodiment detects the average value of the time length of the short circuit period, and performs reverse transmission during the reverse period so that the average value of the time length of the short circuit period becomes equal to the preset short circuit time setting value.
- the peak value is feedback controlled.
- 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, and the same reference numerals are given to the same blocks, and description thereof will not be repeated.
- a short circuit time average value detection circuit DTS, a short circuit time setting circuit DTR, and a time error amplifier circuit ET are added to FIG. 1, and the reverse peak value setting circuit WRR in FIG. 1 is changed to a second reverse peak value setting circuit WRR2. Is replaced.
- these blocks will be described with reference to FIG.
- the short circuit time average value detection circuit DTS receives the above short circuit determination signal Sd, measures the short circuit time when the short circuit determination signal Sd is at the high level (short circuit period), and calculates the average value of the short circuit time per unit time. It calculates and outputs the short circuit time average value detection signal Dts.
- the unit time is, for example, about 0.1 to 1 second.
- the short circuit time setting circuit DTR outputs a predetermined short circuit time setting signal Dtr.
- the short circuit time setting signal Dtr is preferably set in the range of 3 to 7 ms.
- the time error amplifying circuit ET receives the short circuit time setting signal Dtr and the short circuit time average value detection signal Dts, and receives an error between the short circuit time setting signal Dtr ( ⁇ ) and the short circuit time average value detection signal Dts (+). And a time error amplified signal Et is output.
- the reverse error peak value setting signal Wrr is feedback-controlled by the time error amplifier circuit ET and the second reverse peak value setting circuit WRR2 so that the short circuit time average value detection signal Dts is equal to the short circuit time setting signal Dtr.
- reverse peak value Wrp is a predetermined value.
- the reverse feed peak value Wrp is feedback-controlled so that the short circuit time average value detection signal Dts is equal to the short circuit time setting signal Dtr. For this reason, the reverse feed peak value Wrp is a value that changes every moment during welding.
- the reverse feed peak value Wrp is automatically adjusted so that the average value of the time length of the short circuit period (short circuit time average value) becomes a desired value. That is, since the reverse peak value Wrp is automatically adjusted to the optimum value, the work efficiency is improved. Furthermore, since the reverse feed peak value Wrp is optimized, the bead appearance is always good, and the stability of the welded state is further improved.
- Embodiment 3 The invention of Embodiment 3 detects the average value of the time length of the short circuit period, and feedback-controls the reverse feed deceleration period so that the average value of the time period of the short circuit period becomes equal to the preset short circuit time setting value. To do.
- FIG. 4 is a block diagram of a welding power source for carrying out the arc welding control method according to Embodiment 3 of the present invention.
- This figure corresponds to FIG. 3, and the same reference numerals are given to the same blocks, and the description thereof will not be repeated.
- the reverse feed deceleration period setting circuit TRDR in FIG. 3 is replaced with a second reverse feed deceleration period setting circuit TRDR2, and the second reverse feed peak value setting circuit WRR2 in FIG. 3 is replaced with a reverse feed peak value setting circuit WRR. It is a thing.
- these blocks will be described with reference to FIG.
- the reverse error deceleration period setting signal Trdr is feedback-controlled by the time error amplifier circuit ET and the second reverse acceleration / deceleration period setting circuit TRDR2 so that the short circuit time average value detection signal Dts is equal to the short circuit time setting signal Dtr. Since reverse peak value setting circuit WRR is the same as the circuit of FIG. 1, description thereof will not be repeated.
- the reverse feed deceleration period Trd is a predetermined value.
- the reverse feed deceleration period Trd is feedback-controlled so that the short circuit time average value detection signal Dts is equal to the short circuit time setting signal Dtr. For this reason, the reverse feed deceleration period Trd is a value that changes every moment during welding.
- the reverse feed deceleration period Trd is automatically adjusted so that the average value of the time length of the short circuit period (short circuit time average value) becomes a desired value.
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Abstract
Description
前記短絡期間中の溶接電流の最大値の平均値が150A以下となるように前記溶接電流を制御する、
ことを特徴とするものである。
図1は、本発明の実施の形態1に係るアーク溶接制御方法を実施するための溶接電源のブロック図である。以下、同図を参照して各ブロックについて説明する。
1)正送加速期間設定信号Tsurによって定まる正送加速期間Tsu中は0から正送ピーク値設定信号Wsrによって定まる正の値の正送ピーク値Wspまで直線状に加速する送給速度設定信号Frを出力する。
2)続いて、正送ピーク期間Tsp中は、上記の正送ピーク値Wspを維持する送給速度設定信号Frを出力する。
3)短絡判別信号SdがLowレベル(アーク期間)からHighレベル(短絡期間)に変化すると、正送減速期間設定信号Tsdrによって定まる正送減速期間Tsdに移行し、上記の正送ピーク値Wspから0まで直線状に減速する送給速度設定信号Frを出力する。
4)続いて、逆送加速期間設定信号Trurによって定まる逆送加速期間Tru中は0から逆送ピーク値設定信号Wrrによって定まる負の値の逆送ピーク値Wrpまで直線状に加速する送給速度設定信号Frを出力する。
5)続いて、逆送ピーク期間Trp中は、上記の逆送ピーク値Wrpを維持する送給速度設定信号Frを出力する。
6)短絡判別信号SdがHighレベル(短絡期間)からLowレベル(アーク期間)に変化すると、逆送減速期間設定信号Trdrによって定まる逆送減速期間Trdに移行し、上記の逆送ピーク値Wrpから0まで直線状に減速する送給速度設定信号Frを出力する。
7)上記の1)~6)を繰り返すことによって正負の台形波状に変化する送給パターンの送給速度設定信号Frが生成される。
1)短絡判別信号SdがHighレベル(短絡期間)に変化した時点から初期期間設定信号Tirによって定まる初期期間Ti中は、初期電流設定信号Iirを電流制御設定信号Icrとして出力する。
2)その後の短絡期間中は、初期電流設定信号Iirの値から電流増加率設定信号Dirによって定まる増加率Diで経時的に増加する電流制御設定信号Icrを出力する。
3)短絡判別信号SdがLowレベル(アーク期間)に変化すると、予め定めた小電流値となる電流制御設定信号Icrを出力する。
1)短絡判別信号SdがHighレベル(短絡期間)であるときは、電流誤差増幅信号Eiを誤差増幅信号Eaとして出力する。
2)短絡判別信号SdがLowレベル(アーク期間)に変化すると、電圧誤差増幅信号Evを誤差増幅信号Eaとして出力する。
3)その後のアーク期間中に小電流期間信号StdがHighレベルとなる期間中は、電流誤差増幅信号Eiを誤差増幅信号Eaとして出力する。
この回路によって、溶接電源の特性は、短絡期間及び小電流期間中は定電流特性となり、それ以外のアーク期間中は定電圧特性となる。
正送ピーク期間Tsp中の時刻t1において短絡が発生すると、同図(C)に示すように、溶接電圧Vwは数Vの短絡電圧値に急減するので、同図(D)に示すように、短絡判別信号SdがHighレベル(短絡期間)に変化する。時刻t1において短絡期間が開始すると、時刻t1~t2の予め定めた正送減速期間Tsdに移行し、同図(A)に示すように、送給速度Fwは上記の正送ピーク値Wspから0まで減速する。例えば、正送減速期間Tsd=1msに設定される。
時刻t4において、溶接ワイヤの逆送及び溶接電流Iwの通電によるピンチ力によって溶滴が移行してアークが発生すると、同図(C)に示すように、溶接電圧Vwは数十Vのアーク電圧値に急増するので、同図(D)に示すように、短絡判別信号SdがLowレベル(アーク期間)に変化する。時刻t4において、アーク期間が開始すると、時刻t4~t5の予め定めた逆送減速期間Trdに移行し、同図(A)に示すように、送給速度Fwは上記の逆送ピーク値Wrpから0まで減速する。例えば、逆送減速期間Trd=1msに設定される。
実施の形態2の発明は、短絡期間の時間長さの平均値を検出し、短絡期間の時間長さの平均値が予め定めた短絡時間設定値と等しくなるように逆送期間中の逆送ピーク値をフィードバック制御するものである。
実施の形態3の発明は、短絡期間の時間長さの平均値を検出し、短絡期間の時間長さの平均値が予め定めた短絡時間設定値と等しくなるように逆送減速期間をフィードバック制御するものである。
2 母材
3 アーク
4 溶接トーチ
5 送給ロール
Di 増加率
DIR 電流増加率設定回路
Dir 電流増加率設定信号
DTR 短絡時間設定回路
Dtr 短絡時間設定信号
DTS 短絡時間平均値検出回路
Dts 短絡時間平均値検出信号
E 出力電圧
Ea 誤差増幅信号
ED 出力電圧検出回路
Ed 出力電圧検出信号
EI 電流誤差増幅回路
Ei 電流誤差増幅信号
ET 時間誤差増幅回路
Et 時間誤差増幅信号
ER 出力電圧設定回路
Er 出力電圧設定信号
EV 電圧誤差増幅回路
Ev 電圧誤差増幅信号
FC 送給制御回路
Fc 送給制御信号
FR 送給速度設定回路
Fr 送給速度設定信号
Fw 送給速度
ICR 電流制御設定回路
Icr 電流制御設定信号
ID 電流検出回路
Id 電流検出信号
Ii 初期電流
IIR 初期電流設定回路
Iir 初期電流設定信号
Iw 溶接電流
PM 電源主回路
SD 短絡判別回路
Sd 短絡判別信号
STD 小電流期間回路
Std 小電流期間信号
SW 電源特性切換回路
Ti 初期期間
TIR 初期期間設定回路
Tir 初期期間設定信号
Trd 逆送減速期間
TRDR 逆送減速期間設定回路
Trdr 逆送減速期間設定信号
TRDR2 第2逆送減速期間設定回路
Trp 逆送ピーク期間
Tru 逆送加速期間
TRUR 逆送加速期間設定回路
Trur 逆送加速期間設定信号
Tsd 正送減速期間
TSDR 正送減速期間設定回路
Tsdr 正送減速期間設定信号
Tsp 正送ピーク期間
Tsu 正送加速期間
TSUR 正送加速期間設定回路
Tsur 正送加速期間設定信号
VD 電圧検出回路
Vd 電圧検出信号
Vw 溶接電圧
WL リアクトル
WM 送給モータ
Wrp 逆送ピーク値
WRR 逆送ピーク値設定回路
WRR2 第2逆送ピーク値設定回路
Wrr 逆送ピーク値設定信号
Wsp 正送ピーク値
WSR 正送ピーク値設定回路
Wsr 正送ピーク値設定信号
Claims (6)
- 溶接ワイヤの材質がアルミニウム又はアルミニウム合金であり、前記溶接ワイヤの送給速度を正送期間と逆送期間とに交互に切り換え、短絡期間とアーク期間とを繰り返して溶接するアーク溶接制御方法において、
前記短絡期間中の溶接電流の最大値の平均値が150A以下となるように前記溶接電流を制御する、
アーク溶接制御方法。 - 前記逆送期間中の逆送ピーク値を、前記短絡期間の時間長さの平均値が7ms以下となるように設定する、
請求項1に記載のアーク溶接制御方法。 - 前記逆送ピーク値の絶対値を少なくとも40m/分以上に設定する、
請求項2に記載のアーク溶接制御方法。 - 前記短絡期間の時間長さの平均値を検出し、前記短絡期間の時間長さの平均値が予め定めた短絡時間設定値と等しくなるように前記逆送期間中の逆送ピーク値をフィードバック制御する、
請求項1に記載のアーク溶接制御方法。 - 前記短絡期間の時間長さの平均値を検出し、前記短絡期間の時間長さの平均値が予め定めた短絡時間設定値と等しくなるように逆送減速期間をフィードバック制御する、
請求項1~3のいずれか1項に記載のアーク溶接制御方法。 - 前記短絡期間中の前記溶接電流を、予め定めた初期期間中は予め定めた初期電流値に制御し、その後は経時的に増加するように制御し、
前記初期期間を1.5ms以上に設定する、
請求項1~5のいずれか1項に記載のアーク溶接制御方法。
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| WO2023223739A1 (ja) * | 2022-05-16 | 2023-11-23 | 株式会社神戸製鋼所 | 溶接ビード形状の制御方法、電源制御方法、積層造形方法、制御装置、電源装置、溶接システム、積層造形システム及びプログラム |
| WO2024034363A1 (ja) * | 2022-08-08 | 2024-02-15 | パナソニックIpマネジメント株式会社 | アーク溶接方法 |
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| JP2023169062A (ja) * | 2022-05-16 | 2023-11-29 | 株式会社神戸製鋼所 | ガスメタルアーク溶接の制御方法、溶接条件の設定方法、溶接制御装置、溶接電源、溶接システム、プログラム、ガスメタルアーク溶接方法及び付加製造方法 |
| CN115945761B (zh) * | 2023-01-04 | 2024-10-01 | 唐山松下产业机器有限公司 | 确定往复送丝焊丝剩余量的方法 |
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| JPWO2018139222A1 (ja) | 2019-11-07 |
| CN110049844B (zh) | 2021-04-06 |
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| EP3575025A1 (en) | 2019-12-04 |
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