WO2022065187A1 - Procédé de commande de soudage - Google Patents

Procédé de commande de soudage Download PDF

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Publication number
WO2022065187A1
WO2022065187A1 PCT/JP2021/034075 JP2021034075W WO2022065187A1 WO 2022065187 A1 WO2022065187 A1 WO 2022065187A1 JP 2021034075 W JP2021034075 W JP 2021034075W WO 2022065187 A1 WO2022065187 A1 WO 2022065187A1
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Prior art keywords
peak
welding
peak period
current value
period
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PCT/JP2021/034075
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English (en)
Japanese (ja)
Inventor
潤司 藤原
祐太郎 新留
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パナソニックＩｐマネジメント株式会社
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Publication of WO2022065187A1 publication Critical patent/WO2022065187A1/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
    • B23K9/09—Arrangements or circuits for arc welding with pulsed current or voltage

Definitions

  • the present invention relates to a welding control method.
  • Patent Document 1 when a short circuit between the welding wire and the welding base material is detected, a current with a slope smaller than the slope of the rising edge of the output waveform of the pulse current is output, and when a constriction phenomenon immediately before the short circuit is opened is detected, the welding current is calculated.
  • a pulse arc welding control method for sharply reducing the current is disclosed.
  • the rise of the output waveform is steep in order to output a high peak current, the arc will expand at once and the molten pool will grow excessively. As a result, the molten metal may be insufficient at the peripheral edge of the weld bead, and undercut may occur.
  • the present invention has been made in view of this point, and an object thereof is to stabilize the detachability of droplets and suppress the occurrence of undercut.
  • the first aspect is a welding control method in which pulse welding is performed by alternately and repeatedly supplying a peak period of a peak current and a base period of a base current between a welding wire and a base metal a plurality of times.
  • the peak period includes a first peak period and a second peak period after the first peak period, and during the first peak period, welding is performed with a predetermined output waveform so as to reach the first peak current value.
  • the welding current is applied with a predetermined output waveform so as to reach the second peak current value larger than the first peak current value. It is characterized by having a second step of flowing.
  • the welding current is flowed with a predetermined output waveform so as to reach the first peak current value during the first peak period. Further, during the second peak period, the welding current is flowed with a predetermined output waveform so as to reach the second peak current value.
  • the second peak current value is larger than the first peak current value.
  • the molten pool of the base metal can be made smaller and the occurrence of undercut can be suppressed.
  • the droplets grown at the tip of the welding wire are separated and transferred to the base metal side, and the molten pool is made into an appropriate size. It can be grown to ensure joint strength.
  • the first peak current value is a current value at which droplets do not separate from the tip of the welding wire
  • the second peak current value is from the tip of the welding wire. It is characterized by having a current value at which the droplet can be detached.
  • the first peak current value is set to a current value at which the droplet does not separate from the tip of the welding wire.
  • the second peak current value is set to a current value at which droplets can be separated from the tip of the welding wire.
  • the droplets do not separate and move to the base metal side, and the occurrence of undercut can be suppressed. Further, during the second peak period, the droplets can be reliably separated and the generation of spatter can be suppressed.
  • the third aspect is characterized in that, in the first or second aspect, the pulse rise in the first peak period is slower than the pulse rise in the second peak period.
  • the pulse rise in the first peak period is made gentler than the pulse rise in the second peak period.
  • the first peak current value is reached while the output waveform has an arcuate shape that rises while being convexly curved upward, and the pulse rise is caused.
  • the fourth aspect is characterized in that, in the first or second aspect, the pulse rise in the first peak period and the pulse rise in the second peak period are gradual, respectively.
  • the pulse rise in the first peak period and the pulse rise in the second peak period are moderated.
  • the pulse rise in the first peak period and the second peak period is made gentle, and the arc gradually spreads from the center, so that the molten pool can be formed small and the occurrence of undercut is suppressed. can do.
  • the first peak current value is reached while gradually changing with an arcuate output waveform that rises while curving upward in a convex shape, and further, in the second peak period.
  • the second peak current value is reached while gradually changing with an arc-shaped output waveform that rises while being convex and curved upward.
  • the pulse rise time in the first peak period is 800 ⁇ s or more
  • the pulse rise time in the second peak period is 600 ⁇ s or more. It is characterized by being.
  • the pulse rises in the first peak period and the second peak period are moderated, respectively.
  • the pulse rise time in the first peak period and the second peak period is lengthened, the pulse rise is made gentle, and the arc gradually spreads from the center to form a small molten pool. , The occurrence of undercut can be suppressed.
  • a sixth aspect is characterized in that, in any one of the first to fifth aspects, the base period is not provided between the first peak period and the second peak period. ..
  • the base period is not provided between the first peak period and the second peak period.
  • the arc directivity is weakened, which may cause instability of droplet detachment.
  • the melt grown at the tip of the weld wire is performed.
  • the droplets can be stably separated and transferred to the base metal side.
  • FIG. 1 is a diagram showing a schematic configuration of an arc welding apparatus according to this embodiment.
  • FIG. 2 is a graph showing an output waveform of a welding current during conventional pulse welding.
  • FIG. 3 is a side sectional view showing a state of an arc during conventional pulse welding.
  • FIG. 4 is a graph showing an output waveform of a welding current during pulse welding according to the present embodiment.
  • FIG. 5 is a side sectional view showing a state of an arc during pulse welding.
  • FIG. 6 is a diagram showing an unstable region and a stable region during the first peak period.
  • FIG. 7 is a diagram showing an unstable region and a stable region during the second peak period.
  • FIG. 8 is a graph showing the output waveform of the welding current during pulse welding according to the first modification.
  • FIG. 9 is a graph showing the output waveform of the welding current during pulse welding according to the second modification.
  • the welding apparatus 10 alternately and repeatedly supplies a peak current and a base current between the welding wire 18 which is a consumable electrode and the base metal 17, and performs pulse welding.
  • the welding wire 18 is held by a torch (not shown). Further, by moving the torch held by a moving means such as a robot (not shown) at a predetermined speed, the tip of the welding wire 18 also moves along the predetermined welding section at the same speed.
  • the welding device 10 includes a primary side rectifying unit 2, a switching unit 3, a main transformer 4, a secondary side rectifying unit 5, a DCL6 (DC reactor), a welding current detection unit 7, and a welding voltage detection unit 8. And an output control unit 11 and a wire feeding speed control unit 13.
  • the welding device 10 has a robot control unit that controls the operation of the robot that holds the torch.
  • the primary side rectifying unit 2 rectifies the input voltage input from the external input power supply 1 (three-phase AC power supply) of the welding device 10.
  • the switching unit 3 controls the output of the primary side rectifying unit 2 to an output suitable for welding.
  • the main transformer 4 converts the output of the switching unit 3 into an output suitable for welding.
  • the secondary side rectifying unit 5 rectifies the output of the main transformer 4.
  • the DCL 6 smoothes the output of the secondary side rectifying unit 5 to a current suitable for welding.
  • the welding current detection unit 7 detects the welding current.
  • the welding voltage detection unit 8 detects the welding voltage.
  • the output control unit 11 outputs a control signal to the switching unit 3 to control the welding output.
  • the wire feeding speed control unit 13 controls the wire feeding unit 21 to control the feeding speed of the welded wire 18.
  • the wire feeding speed control unit 13 includes a wire feeding speed detecting unit 14 and a calculation unit 15.
  • the wire feeding speed detection unit 14 detects the wire feeding speed.
  • the calculation unit 15 calculates the integrated amount of the feed amount of the welded wire 18 based on the signal from the wire feed rate detection unit 14, and controls the wire feed rate. Specifically, the difference is obtained by comparing the command value of the wire feeding speed with the detected value, and feedback control is performed so as to match the actual wire feeding speed with the command value based on the integrated amount of the difference. ..
  • the wire feeding unit 21 and the welding condition setting unit 22 are connected to the welding device 10.
  • the wire feeding unit 21 controls the feeding of the welded wire 18 based on the signal from the wire feeding speed control unit 13.
  • the welding condition setting unit 22 is used to set the welding conditions of the welding apparatus 10.
  • the torch switch (not shown) When the torch switch (not shown) is turned on, the welding output of the welding device 10 is supplied to the welding wire 18 via the welding tip 20 of the torch (not shown). Then, an arc 19 is generated between the welding wire 18 and the base metal 17 by the welding output of the welding device 10, and welding is performed.
  • the material of the welding wire 18 is mild steel
  • the wire diameter is 1.2 mm
  • the material of the base metal 17 is mild steel.
  • the welding device 10 performs MAG welding using a mixed gas of argon gas and carbon dioxide gas as a shield gas.
  • the set average value of the welding current (hereinafter, may be referred to as a set current) is set to 200 A.
  • the specific numerical values described in the following description are merely examples and are not limited to these.
  • the welding device 10 causes a welding current to flow through the welding wire 18 with a predetermined output waveform so as to reach the peak current value Ip during one peak period Tp.
  • the peak current value Ip is set to, for example, 470 A.
  • the output waveform of the welding current is set so as to reach the peak current value Ip after 600 ⁇ s has elapsed.
  • the peak current value Ip is reached with an output waveform that rises steeply while sloping upward. After reaching the peak current value Ip, the peak current value Ip is maintained until the end of the peak period Tp.
  • the molten pool grows excessively.
  • the molten metal on the vertical plate side of the base metal 17 hangs down, and the molten metal is insufficient at the peripheral edge of the weld bead, which may cause undercut.
  • the detachability of the droplets becomes unstable, and spatter may occur.
  • the detachability of the droplets can be stabilized and the occurrence of undercut can be suppressed.
  • FIG. 4 is a graph showing the output waveform of the welding current at the time of pulse welding according to the present embodiment.
  • pulse welding is performed by alternately and repeatedly supplying a peak current and a base current a plurality of times.
  • One pulse period includes a first peak period Tp1, a second peak period Tp2, and a base period Tb.
  • the second peak period Tp2 is the period after the first peak period Tp1 in the peak period Tp.
  • the second peak period Tp2 is the period after the first peak current value Ip1 of the first peak period Tp1 in the peak period Tp.
  • the base period Tb is not provided between the first peak period Tp1 and the second peak period Tp2. Specifically, if a current close to the base current Ib is supplied in the process of growing a droplet, the arc directivity is weakened, which may cause instability of droplet detachment.
  • the base period Tb is not provided between the first peak period Tp1 and the second peak period Tp2, and the first peak period Tp1 and the second peak period Tp2 are two. Pulse welding is performed while maintaining arc directivity at the stage. In other words, since pulse welding is performed while maintaining arc directivity in at least two stages of the first peak period Tp1 and the second peak period Tp2 that rise continuously, it grows to the tip of the welding wire 18. It is possible to stably separate the droplets and transfer them to the base metal 17 side.
  • the welding device 10 causes a welding current to flow through the welding wire 18 with a predetermined output waveform so that the first peak current value Ip1 is reached during the first peak period Tp1.
  • the first peak current value Ip1 is set to a current value at which droplets do not separate from the tip of the welding wire 18.
  • the first peak current value Ip1 is set to, for example, 300A.
  • the output waveform of the welding current is set so as to reach the first peak current value Ip1 after 800 ⁇ s or more, preferably 1200 ⁇ s, in order to moderate the pulse rise.
  • the first peak current value Ip1 is reached while gradually changing with an arcuate output waveform that rises while being convex and curved upward.
  • the optimum amount of molten metal can be adjusted according to the difference in components that differ depending on the manufacturer of the welding wire.
  • it is effective for welding wires 18 having a low content of silicon (Si) and manganese (Mn) and low surface tension and viscosity.
  • the welding device 10 After the lapse of the first peak period Tp1, the welding device 10 causes a welding current to flow through the welding wire 18 with a predetermined output waveform so as to reach the second peak current value Ip2 during the second peak period Tp2.
  • the second peak current value Ip2 is set to a current value at which droplets can be separated from the tip of the welding wire 18.
  • the second peak current value Ip2 is set to, for example, 550A.
  • the output waveform of the welding current is set so as to reach the second peak current value Ip2 after 600 ⁇ s or more, preferably 800 ⁇ s, in order to moderate the pulse rise.
  • the second peak current value Ip2 is reached while gradually changing with an arcuate output waveform that rises while being convex and curved upward.
  • the arc 19 spreads at once to form a large molten pool, which may cause undercut depending on the shape of the joint of the base metal 17.
  • the pulse rise in the first peak period Tp1 and the second peak period Tp2 is made gentle, and the arc 19 gradually expands from the center to form a small molten pool, resulting in undercut. The occurrence can be suppressed.
  • the first peak current value Ip1 is reached while gradually changing with an arcuate output waveform that rises while curving upward, and further, the second peak period.
  • the second peak current value Ip2 is reached while gradually changing with an arcuate output waveform that rises while being convex and curved upward.
  • the pulse rise time in the first peak period Tp1 is 800 ⁇ s or more
  • the pulse rise time in the second peak period Tp2 is 600 ⁇ s or more.
  • the arc 19 spreads at once to form a large molten pool, which may cause undercut depending on the shape of the joint of the base metal 17.
  • the pulse rise time in the first peak period Tp1 and the second peak period Tp2 is lengthened, the pulse rise is slowed down, and the arc 19 gradually spreads from the center to melt.
  • the pond can be formed small and the occurrence of undercut can be suppressed.
  • the welding device 10 supplies the base current Ib to the welding wire 18 during the base period Tb after the lapse of the peak period Tp.
  • the base current Ib is set to, for example, 80A.
  • the spread of the arc 19 is reduced by performing pulse welding at the first peak current value Ip1 by slowing the pulse rise during the first peak period Tp1.
  • the molten pool of the base metal 17 can be made smaller, and the occurrence of undercut can be suppressed.
  • the pulse rise time during the first peak period Tp1 is longer than the pulse rise time during the second peak period Tp2, and the pulse rise during the first peak period Tp1 becomes the pulse rise during the second peak period Tp2. It is more gradual than that.
  • the pulse rise reaches the first peak current value Ip1 while gradually changing with an arcuate output waveform that rises while curving upward in a convex shape, and the pulse rise is performed during the second peak period Tp2.
  • the molten pool can be formed smaller by gradually expanding the arc 19 from the center, and the occurrence of undercut can be suppressed.
  • pulse welding is performed at the second peak current value Ip2, which is larger than the first peak current value Ip1, to separate the droplets grown on the tip of the welding wire 18 and move them to the base metal side. It can be transferred and the molten pool can be grown to an appropriate size to ensure the joint strength.
  • whether or not the droplet is stably separated from the tip of the welding wire 18 is determined by the elapsed time until the peak current value is reached in the second peak period Tp2.
  • FIG. 6 is a diagram showing an unstable region and a stable region during the first peak period.
  • undercut as shown in FIG. 6, the “unstable region” represents a region where undercut is likely to occur.
  • the “stable region” represents a region where undercut does not occur.
  • Such an unstable region and a stable region can be obtained in advance by experiments or the like.
  • the elapsed time of the first peak period Tp1 is 1200 ⁇ s and the first peak current value Ip1 is 300 A, so that it can be seen that the first peak period Tp1 is located in the stable region as shown in FIG.
  • the time to reach the peak current value Ip is 600 ⁇ s and the peak current value Ip is 470 A, so that it can be seen that the welding device is located in the unstable region. Therefore, it can be seen that undercut is likely to occur in the output waveform of the welding current in the conventional welding apparatus.
  • FIG. 7 is a diagram showing an unstable region and a stable region during the second peak period after the output of the stable region during the first peak period.
  • the “unstable region” represents a region where the detachment of the droplet is unstable.
  • the “stable region” represents a region in which the detachment of droplets is stable. Such an unstable region and a stable region can be obtained in advance by experiments or the like.
  • the elapsed time of the second peak period Tp2 is 800 ⁇ s and the second peak current value Ip2 is 550 A, so that it can be seen that the second peak period Tp2 is located in the stable region as shown in FIG.
  • the second peak period following the first peak current value Ip1 of the first peak period is not provided in the peak period Tp.
  • the welding current is flowed with a predetermined output waveform so as to reach the first peak current value Ip1 during the first peak period Tp1. Further, during the second peak period Tp2, the welding current is flowed with a predetermined output waveform so as to reach the second peak current value Ip2.
  • the second peak current value Ip2 is larger than the first peak current value Ip1.
  • the molten pool of the base metal 17 can be made smaller and the occurrence of undercut can be suppressed.
  • the droplets grown at the tip of the welding wire 18 are separated and transferred to the base metal 17 side, and the molten pool is appropriately prepared. It is possible to secure the bonding strength by growing it to a large size. Further, by surely separating the droplets during the second peak period Tp2, the generation of spatter can be suppressed.
  • FIG. 8 is a graph showing the output waveform of the welding current during pulse welding according to the first modification.
  • the same parts as those in the above embodiment are designated by the same reference numerals, and only the differences will be described.
  • one pulse period includes a first peak period Tp1, a second peak period Tp2, and a base period Tb.
  • the second peak period Tp2 is the period after the first peak period Tp1 in the peak period Tp.
  • the second peak period Tp2 is the period after the first peak current value Ip1 of the first peak period Tp1 in the peak period Tp.
  • the welding device 10 causes a welding current to flow through the welding wire 18 with a predetermined output waveform so that the first peak current value Ip1 is reached during the first peak period Tp1.
  • the first peak current value Ip1 is set to a current value at which droplets do not separate from the tip of the welding wire 18.
  • the first peak current value Ip1 is set to, for example, 300A.
  • the output waveform of the welding current is set so as to reach the first peak current value Ip1 after 1200 ⁇ s has elapsed.
  • the first peak current value Ip1 is reached while gradually changing with a linear output waveform that rises while inclining upward.
  • the welding device 10 After the lapse of the first peak period Tp1, the welding device 10 causes a welding current to flow through the welding wire 18 with a predetermined output waveform so as to reach the second peak current value Ip2 during the second peak period Tp2.
  • the second peak current value Ip2 is set to a current value at which droplets can be separated from the tip of the welding wire 18.
  • the second peak current value Ip2 is set to, for example, 550A.
  • FIG. 9 is a graph showing the output waveform of the welding current during pulse welding according to the second modification.
  • one pulse period includes a first peak period Tp1, a second peak period Tp2, and a base period Tb.
  • the second peak period Tp2 is the period after the first peak period Tp1 in the peak period Tp.
  • the second peak period Tp2 is the period after the first peak current value Ip1 of the first peak period Tp1 in the peak period Tp.
  • the welding device 10 causes a welding current to flow through the welding wire 18 with a predetermined output waveform so that the first peak current value Ip1 is reached during the first peak period Tp1.
  • the first peak current value Ip1 is set to a current value at which droplets do not separate from the tip of the welding wire 18.
  • the first peak current value Ip1 is set to, for example, 300A.
  • the output waveform of the welding current is set so as to reach the first peak current value Ip1 after 1200 ⁇ s has elapsed.
  • the linear output waveform that rises while tilting upward gradually changes, and then the arc-shaped output waveform that rises while further convexing and curving upward.
  • the first peak current value Ip1 is reached while gradually changing at.
  • the welding device 10 After the lapse of the first peak period Tp1, the welding device 10 causes a welding current to flow through the welding wire 18 with a predetermined output waveform so as to reach the second peak current value Ip2 during the second peak period Tp2.
  • the second peak current value Ip2 is set to a current value at which droplets can be separated from the tip of the welding wire 18.
  • the second peak current value Ip2 is set to, for example, 550A.
  • the embodiment may have the following configuration.
  • the peak period is an output waveform divided into two stages of a first peak period Tp1 and a second peak period Tp2, but for example, an output waveform including three or more peak periods may be used.
  • the present invention is extremely useful and industrially applicable because it has a highly practical effect of stabilizing the detachability of droplets and suppressing the occurrence of undercut.
  • the sex is high.

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

Abstract

Selon la présente invention, pendant une première période de pic (Tp1), un courant de soudage est appliqué avec une forme d'onde de sortie prescrite de sorte à atteindre une première valeur de courant de pic (Ip1). Pendant une seconde période de pic (Tp2) après la première période de pic (Tp1), le courant de soudage est appliqué avec une forme d'onde de sortie prescrite de sorte à atteindre une seconde valeur de courant de pic (Ip2). La seconde valeur de courant de pic (Ip2) est supérieure à la première valeur de courant de pic (Ip2).
PCT/JP2021/034075 2020-09-28 2021-09-16 Procédé de commande de soudage WO2022065187A1 (fr)

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JP2020162421 2020-09-28

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10328837A (ja) * 1997-03-31 1998-12-15 Daihen Corp 交流パルスミグ溶接方法及び溶接装置
JP2007237270A (ja) * 2006-03-10 2007-09-20 Kobe Steel Ltd パルスアーク溶接方法
JP2019034333A (ja) * 2017-08-22 2019-03-07 株式会社神戸製鋼所 パルスアーク溶接方法、溶接物の製造方法および溶接用電源装置
JP2020069536A (ja) * 2018-10-30 2020-05-07 リンカーン グローバル，インコーポレイテッド 二段パルスランプ波

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10328837A (ja) * 1997-03-31 1998-12-15 Daihen Corp 交流パルスミグ溶接方法及び溶接装置
JP2007237270A (ja) * 2006-03-10 2007-09-20 Kobe Steel Ltd パルスアーク溶接方法
JP2019034333A (ja) * 2017-08-22 2019-03-07 株式会社神戸製鋼所 パルスアーク溶接方法、溶接物の製造方法および溶接用電源装置
JP2020069536A (ja) * 2018-10-30 2020-05-07 リンカーン グローバル，インコーポレイテッド 二段パルスランプ波

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