WO2015015759A1 - 放電加工システム - Google Patents

放電加工システム Download PDF

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Publication number
WO2015015759A1
WO2015015759A1 PCT/JP2014/003861 JP2014003861W WO2015015759A1 WO 2015015759 A1 WO2015015759 A1 WO 2015015759A1 JP 2014003861 W JP2014003861 W JP 2014003861W WO 2015015759 A1 WO2015015759 A1 WO 2015015759A1
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WO
WIPO (PCT)
Prior art keywords
electric discharge
discharge machining
resistance value
voltage
high frequency
Prior art date
Application number
PCT/JP2014/003861
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English (en)
French (fr)
Japanese (ja)
Inventor
龍之介 柴垣
小林　直樹
政富美 鳴戸
Original Assignee
パナソニックＩｐマネジメント株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by パナソニックＩｐマネジメント株式会社 filed Critical パナソニックＩｐマネジメント株式会社
Priority to CN201480042416.8A priority Critical patent/CN105431248B/zh
Priority to JP2015529371A priority patent/JP6260007B2/ja
Publication of WO2015015759A1 publication Critical patent/WO2015015759A1/ja

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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
    • B23K9/067—Starting the arc
    • B23K9/0672—Starting the arc without direct contact between electrodes
    • B23K9/0673—Ionisation of the arc gap by means of a tension with a step front (pulses or high frequency tensions)

Definitions

  • the present disclosure relates to an electric discharge machining system that generates an arc between non-contact metals, a high-frequency generator that generates a high-frequency high voltage, and an electric discharge machining power supply device that outputs the high-frequency high voltage using the generated high-frequency high voltage.
  • the present invention relates to an electric discharge machining system.
  • a high frequency high voltage is applied between the electrode and the base material.
  • Application of a high frequency high voltage between the electrode and the base material causes dielectric breakdown between the electrode and the base material.
  • a high-frequency generator is used (for example, see Patent Document 1).
  • FIG. 6 is a diagram showing a welding system using a conventional high-frequency generator 112 and a welding power source device 111.
  • FIG. 7 is a sequence diagram showing a voltage output by a conventional high frequency generator.
  • the welding power supply device 111 includes a primary side rectification unit 101, an inverter unit 102, a main transformer 103, a secondary side rectification unit 104, a control unit 107, and a coupling coil 110.
  • the primary side rectification unit 101 rectifies the AC voltage input to the welding power source device 111.
  • the inverter unit 102 converts the voltage rectified by the primary side rectification unit 101 into an AC voltage.
  • the main transformer 103 transforms the AC voltage from the inverter unit 102.
  • the secondary side rectification unit 104 rectifies the AC voltage from the main transformer 103.
  • the control unit 107 is connected to the machining torch 105 by the torch switch signal line 106, and an on / off signal of the torch switch 124 provided in the machining torch 105 is input from the machining torch 105.
  • the control unit 107 is connected to the start switch 113 of the high frequency generator 112 through the high frequency device on / off signal line 108 and outputs an on / off signal to the start switch 113.
  • the coupling coil 110 is for applying the high frequency high voltage generated by the high frequency generator 112 to the welding power source 111 side.
  • the high-frequency generator 112 includes a start switch 113, a rectifier 114, a switching circuit 115, a step-up transformer 117, a rectifier diode 122, a capacitor 118, and a spark gap 119.
  • the start switch 113 starts and stops the high frequency generator 112.
  • the rectifier 114 rectifies the input AC voltage.
  • the switching circuit 115 performs switching to induce a voltage on the secondary side of the step-up transformer 117.
  • the step-up transformer 117 boosts the voltage input from the rectifier 114 via the switching circuit 115.
  • the rectifier diode 122 rectifies the voltage from the step-up transformer 117.
  • Capacitor 118 charges the output from rectifier diode 122.
  • the spark gap 119 causes a discharge to generate a high voltage.
  • the machining torch 105 includes an electric discharge machining electrode 123 and a torch switch 124. Further, the high frequency high voltage output from the welding power source 111 is applied between the electrode 123 provided on the machining torch 105 and the workpiece 109, and an arc is generated between the electrode 123 and the workpiece 109. appear.
  • the AC voltage is input to the high-frequency generator 112 from the secondary side of the main transformer 103 of the welding power supply device 111, and the input AC voltage is rectified by the rectifier 114 and the switching circuit 115 is switched. As a result, a high voltage is induced on the secondary side of the step-up transformer 117. Then, the voltage from the secondary side of the step-up transformer 117 is rectified and the capacitor 118 is charged. When the charging voltage of the capacitor 118 reaches the discharge threshold of the spark gap 119, discharge occurs in the spark gap 119. Thereby, a high frequency high voltage is applied to the primary side of the coupling coil 110, and a high frequency high voltage is induced to the secondary side of the coupling coil 110. When a high frequency high voltage is applied between the electrode 123 and the workpiece 109, dielectric breakdown occurs and a micro arc is generated.
  • the starting and stopping of the high-frequency generator 112 is linked with the on / off of the torch switch 124 of the processing torch 105 connected to the welding power supply device 111 via the control unit 107.
  • On is a state where a high frequency high voltage is output from the welding power source device 111
  • off is a state where the output of the high frequency high voltage from the welding power source device 111 is stopped.
  • the high frequency generator 112 is stopped after the main arc is detected, there is a time difference until the stop. During this time difference, the high-frequency high voltage is output a plurality of times.
  • the interval (hereinafter referred to as the generation cycle) of the high frequency high voltage output intermittently is 20 msec or less. If the frequency of the high frequency high voltage is 1 MHz, the period of the high frequency high voltage is 1 ⁇ sec, and the time for one high frequency high voltage to disappear is 5 ⁇ sec (see, for example, Patent Document 2 and Patent Document 3).
  • the welding power source device 111 continues to output the high frequency high voltage for every generation period of the high frequency high voltage. On the other hand, when the torch switch 124 is turned off, the welding power source device 111 stops the output of the high frequency high voltage.
  • the time during which a high frequency high voltage is output is one cycle of high frequency high voltage even in one start, one re-ignition, or idle shot (trial shot). Longer than that, multiple high frequency high voltages are generated. For this reason, a large amount of noise is generated, which adversely affects peripheral devices.
  • the present disclosure relates to electric discharge machining that reduces the amount of noise generated by generating a single high-frequency high voltage even at one start, one re-ignition, or idle strike (trial strike). Provide a system.
  • the electric discharge machining system of the present disclosure includes a machining torch, an electric discharge machining power supply device, and a high-frequency generator.
  • the processing torch has a torch switch and an electrode.
  • the electric discharge machining power supply device supplies electric power between the electrode and the workpiece.
  • the high frequency generator supplies a high frequency high voltage generated in a first generation cycle between the electrode and the workpiece. While the torch switch is continuously on, the high frequency high voltage is supplied only once from the high frequency generator.
  • the present disclosure outputs a high-frequency high voltage only once during a continuous ON operation of the torch switch, so that the amount of noise generation can be suppressed and the influence of noise on peripheral devices can be reduced. Can be reduced.
  • FIG. 1 is a diagram showing a schematic configuration of the electric discharge machining system according to the first embodiment.
  • FIG. 2 is a sequence diagram illustrating a voltage output from the high-frequency generator according to the first embodiment.
  • FIG. 3 is a diagram illustrating the time required for a person to click the torch switch continuously.
  • FIG. 4 is a diagram illustrating a schematic configuration of the electric discharge machining system according to the second embodiment.
  • FIG. 5 is a diagram illustrating a schematic configuration of the electric discharge machining system according to the third embodiment.
  • FIG. 6 is a diagram showing a welding system using a conventional high-frequency generator and a welding power source device.
  • FIG. 7 is a sequence diagram of a voltage output from a conventional high frequency generator.
  • FIG. 1 is a diagram showing a schematic configuration of an electric discharge machining system according to the present embodiment.
  • FIG. 2 is a sequence diagram illustrating a voltage output from the high-frequency generator according to the present embodiment.
  • FIG. 3 is a diagram illustrating the time required for a person to click the torch switch continuously.
  • the electric discharge machining system of the present embodiment includes a welding power source device 11, a high frequency generator 12, and a machining torch 5.
  • the welding power source device 11 includes a primary side rectification unit 1, an inverter unit 2, a main transformer 3, a secondary side rectification unit 4, a control unit 7, and a coupling coil 10.
  • the primary side rectification unit 1 rectifies the AC voltage input to the welding power source device 11 into a DC voltage using a diode or a capacitor.
  • the inverter unit 2 converts the DC voltage rectified by the primary side rectification unit 1 into an AC voltage by switching the switching element.
  • the main transformer 3 transforms the AC voltage from the inverter unit 2.
  • the secondary side rectification unit 4 rectifies the AC voltage from the main transformer 3 into a DC voltage using a diode or a capacitor.
  • the control unit 7 is connected to the machining torch 5 by the torch switch signal line 6, and an on / off signal of the torch switch 24 provided in the machining torch 5 is input from the machining torch 5.
  • the control unit 7 is connected to the start switch 13 of the high frequency generator 12 by a high frequency device on / off signal line 8 and outputs an on / off signal to the start switch 13.
  • the coupling coil 10 is for applying the high frequency high voltage generated by the high frequency generator 12 to the welding power source device 11 side.
  • the high frequency high voltage indicates, for example, a frequency of 1 MHz or higher and a voltage of 1 kV or higher.
  • the high-frequency generator 12 includes a start switch 13, a rectifier 14, a switching circuit 15, a current limiting resistor 16 (a resistor having a first resistance value), a step-up transformer 17 (transformer), and a rectifier diode 22. And a capacitor 18 and a spark gap 19.
  • each component of the high frequency generator 12 may be arrange
  • the start switch 13 starts and stops the high-frequency generator 12.
  • the rectification unit 14 rectifies the input AC voltage into a DC voltage using a diode or a capacitor.
  • the rectifying unit 14 is connected to the secondary side of the main transformer 3 of the welding power source device 11 via the start switch 13 in series.
  • the switching circuit 15 performs switching to induce a voltage on the secondary side of the step-up transformer 17.
  • the switching circuit 15 turns the input DC voltage into a pulse by switching on / off.
  • the current limiting resistor 16 limits the current flowing to the primary side of the step-up transformer 17.
  • the step-up transformer 17 steps up a pulsed DC voltage that has passed through the switching circuit 15.
  • the step-up transformer 17 is a pulse transformer, generates a boosted pulsed DC voltage on the secondary side, and outputs it to the rectifier diode 22.
  • the capacitor 18 is connected in parallel to the step-up transformer 17 and charges the DC voltage from the rectified step-up transformer 17.
  • the spark gap 19 is directly connected between the step-up transformer 17 and one of the output terminals 21 of the high-frequency generator 12, and generates a high voltage by causing a discharge. Both ends of the secondary side coil of the step-up transformer 17 are respectively connected to one output end 21 and a spark gap 19 of the high frequency generator 12, and the two output ends 21 are connected to both ends of the primary coil of the coupling coil 10. It is connected.
  • the machining torch 5 includes an electric discharge machining electrode 23 and a torch switch 24.
  • the welding power supply device 11 processes the workpiece 9 by generating a main arc by supplying electric power between the electrode 23 and the workpiece 9. Further, the high frequency high voltage output from the welding power source device 11 is applied between the electrode 23 provided on the machining torch 5 and the workpiece 9, and a minute arc is generated between the electrode 23 and the workpiece 9. Will occur.
  • the control unit 7 of the welding power supply device 11 detects the signal of the torch switch 24 and sends an activation signal to the high frequency generator 12.
  • AC voltage is input to the high-frequency generator 12 from the secondary side of the main transformer 3 of the welding power source 11, and the input AC voltage is rectified into a DC voltage by the rectifier 14, and the switching circuit 15 is switched.
  • a pulsed DC voltage is applied to the primary side of the step-up transformer 17 and a high voltage is induced on the secondary side of the step-up transformer 17.
  • a high DC voltage from the secondary side of the step-up transformer 17 is rectified by the rectifier diode 22 to charge the capacitor 18.
  • the charging voltage of the capacitor 18 reaches the discharge threshold value of the spark gap 19, discharge occurs in the spark gap 19. At this time, a high voltage is generated while being oscillated by the coil on the primary side of the coupling coil 10 and the capacitor 18.
  • a high frequency high voltage is applied to the primary side of the coupling coil 10, and a high frequency high voltage is induced on the secondary side of the coupling coil 10.
  • a high frequency high voltage is applied between the electrode 23 and the workpiece 9
  • dielectric breakdown occurs between the electrode 23 and the workpiece 9, and a micro arc is generated.
  • the high frequency generator 12 once the discharge occurs in the spark gap 19, the charging voltage charged in the capacitor 18 is once lowered, and charging is started again. That is, the period at which the capacitor 18 discharges (the period at which the spark gap 19 causes discharge) becomes the generation period (first generation period) of the high-frequency high voltage.
  • the primary side current of the step-up transformer 17 is limited by the current limiting resistor 16. As a result, the charging speed of the capacitor 18 is delayed as compared with the case where the current limiting resistor 16 is not provided. For this reason, the generation cycle of the high frequency high voltage also becomes long.
  • the generation period of the high frequency high voltage that is intermittently output can be controlled by the resistance value of the current limiting resistor 16 and the capacitance value of the capacitor 18. That is, the larger the resistance value of the current limiting resistor 16 is, the slower the current speed becomes, so that it takes time to charge the capacitor 18, and therefore the generation period of the high frequency and high voltage becomes longer.
  • the resistance value and the capacitance value are set such that the generation period of the high frequency high voltage is longer than that in the prior art.
  • control unit 7 controls the start switch 13 to be turned on for a time that is equal to or longer than the generation period of the high frequency high voltage and less than twice the generation period.
  • the high frequency generator 12 can be controlled to output the high frequency voltage only once by one continuous ON operation of the torch switch 24. Even if the torch switch 24 continues to be kept on, no high frequency voltage is output for the second and subsequent times.
  • the generation frequency of the high frequency and high voltage is obtained based on, for example, an experiment and stored in the control unit 7 in advance.
  • FIG. 2 shows a high-frequency high-voltage output sequence of the present embodiment and a conventional high-frequency high-voltage output sequence.
  • a high frequency high voltage is output only once regardless of the length of the continuous on state in this embodiment.
  • a high frequency high voltage is continuously output while the torch switch 24 is continuously turned on.
  • the time required for the first high-frequency high voltage to be generated after the torch switch 24 is turned on is longer than that in the present embodiment. This is because, in the present embodiment, as described above, the current limiting resistor 16 is provided to lengthen the generation period of the high frequency high voltage.
  • the start switch 13 of the high frequency generator 12 is turned off, so that the high frequency high voltage is not output.
  • the resistance value of the current limiting resistor 16 is determined from 1 to 5 k ⁇
  • the capacitance of the capacitor 18 is determined from 2 to 10 nF
  • the generation period of the high frequency high voltage is set to 30 to 70 msec. .
  • a mechanical relay is used as the switch element used for the start switch 13 in consideration of insulation between the control side and the load side.
  • the guaranteed response speed that is, the time from when the activation command is received until it is reliably turned on is about 10 msec. Therefore, in order to perform accurate control, it is necessary to secure an ON / OFF control speed of a mechanical relay that is sufficiently longer than that.
  • this control speed is slowed down, the response speed of the high frequency generator 12 is also slowed down. That is, the time difference from when the torch switch 24 is turned on until a high frequency is output increases.
  • the time taken for the operator to click the torch switch 24 continuously is 70 msec or more. Therefore, the response speed required for high-speed continuous start is sufficient if it is 70 msec.
  • the resistance value of the current limiting resistor 16 and the capacitance of the capacitor 18 are determined so that the generation period of the high frequency high voltage is 30 to 70 msec, more preferably 30 to 40 msec. Then, by using the current limiting resistor 16 having the determined resistance value and the capacitor 18 having the determined capacitance for the high frequency generator 12, the torch switch 24 can be turned on only once and reliably. High frequency high voltage can be generated.
  • the high-frequency and high-voltage generation cycle is preferably 30 to 40 msec rather than 30 to 70 msec.
  • the electric discharge machining system and the high frequency generator 12 of the present embodiment it is possible to prevent the generation of an extra high frequency high voltage, and the amount of noise generation can be reduced.
  • the current limiting resistor 16 may be provided at another position not on the substrate.
  • the high frequency generator 12 itself may be formed of a circuit board and provided in the welding power source 11 so that the high frequency generator 12 may be integrated with the welding power source 11. Further, the components of the high-frequency generator 12 other than the current limiting resistor 16 may be integrated with the welding power source device 11.
  • FIG. 4 is a diagram showing a schematic configuration of the electric discharge machining system according to the present embodiment.
  • the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
  • the difference from the first embodiment is that, in the high frequency generator 12, the current limiting resistor 16 having a fixed resistance value is changed to a variable resistor 20 having a variable resistance value.
  • the variable resistor 20 can have both a first resistance value and a second resistance value different from the first resistance value, and can continuously change the resistance value.
  • the response speed of the high frequency and high voltage output by changing the resistance value of the variable resistor 20, the response speed of the high frequency and high voltage output, the time from when the torch switch 24 is turned on until the high frequency and high voltage is output, and the high frequency and high voltage are output. It is possible to easily and arbitrarily change the voltage generation cycle.
  • the response speed and the high-frequency and high-voltage generation cycle can be finely adjusted, and the maintainability and productivity of the high-frequency generator 12 can be improved. It can be improved.
  • the control unit 7 determines the generation period of the high frequency high voltage based on the resistance value. For example, when the variable resistor 20 has a first resistance value, the high-frequency high voltage generation cycle is the first cycle, and when the variable resistor 20 has the second resistance value, the high-frequency high voltage generation cycle is the second cycle. It becomes the cycle of.
  • the control unit 7 controls the start switch 13 to be turned on for a time that is equal to or longer than the generation cycle of the high-frequency high voltage and less than twice the generation cycle. Therefore, even if the resistance value of the variable resistor 20 is changed to change the generation cycle of the high frequency high voltage, the high frequency high voltage can be output only once by turning on the torch switch 24 once.
  • FIG. 5 is a diagram showing a schematic configuration of the electric discharge machining system according to the present embodiment.
  • the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
  • the difference from the first embodiment is that, in the high frequency generator 12, the current limiting resistor 16 having a fixed resistance value is a switching resistor 25 whose resistance value can be changed, and a resistor for switching the resistance of the switching resistor 25.
  • the switching instruction unit 26 is further provided.
  • the switching resistor 25 is, for example, two or more resistors connected in parallel, and selects a resistance value by switching the resistance based on an instruction from the resistance switching instruction unit 26. Note that FIG. 5 shows an example in which two resistors (a resistor having a first resistance value and a resistor having a second resistance value) are connected in parallel in the switching resistor 25.
  • the resistance switching instruction unit 26 is a changeover switch provided in the high frequency generator 12.
  • the resistance switching instruction unit 26 may be provided in the welding power supply device 11.
  • the resistance switching instruction unit 26 When the resistance switching instruction unit 26 is provided in the welding power supply device 11, it may be provided as a push button or a volume on the operation panel (not shown) of the welding power supply device 11.
  • the switching resistor 25 has a configuration in which two resistors are connected in parallel, one resistor having a first resistance value, and the other resistor having a second resistance smaller than the first resistor.
  • the resistance switching instruction unit 26 is operated to set the resistance of the switching resistor 25 to the first resistance value, and the welding power supply device 11 is a plasma cutting power supply device. Operates the resistance switching instruction unit 26 to set the resistance of the switching resistor 25 as the second resistance value.
  • the response speed of the high frequency high voltage in TIG welding is slower than the response speed of the high frequency high voltage in plasma cutting.
  • the generation period of the high frequency high voltage in TIG welding becomes longer than the generation period of the high frequency high voltage in plasma cutting.
  • the noise at the time of TIG welding start can be suppressed.
  • the arc by the high frequency and high voltage serves as a guide for a cutting locus in plasma cutting as a pilot arc, and the convenience for the operator is improved.
  • the control unit 7 determines the generation period of the high frequency high voltage based on this. Based on the determined generation cycle of the high-frequency high voltage, the control unit 7 controls the start switch 13 to be turned on for a time that is equal to or longer than the generation cycle of the high-frequency high voltage and less than twice the generation cycle. Thereby, even if the resistance of the switching resistor 25 is switched to switch the generation cycle of the high-frequency high voltage, the high-frequency high voltage can be output only once by turning the torch switch 24 once.
  • noise generation at the time of arc start can be reduced, which is industrially useful as an electric discharge machining system that generates an arc in a non-contact manner.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Generation Of Surge Voltage And Current (AREA)
  • Arc Welding Control (AREA)
PCT/JP2014/003861 2013-07-31 2014-07-23 放電加工システム WO2015015759A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201480042416.8A CN105431248B (zh) 2013-07-31 2014-07-23 放电加工系统
JP2015529371A JP6260007B2 (ja) 2013-07-31 2014-07-23 放電加工システム

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Application Number Priority Date Filing Date Title
JP2013158599 2013-07-31
JP2013-158599 2013-07-31

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WO2015015759A1 true WO2015015759A1 (ja) 2015-02-05

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CN (1) CN105431248B (zh)
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020059186A1 (ja) * 2018-09-18 2020-03-26 パナソニックＩｐマネジメント株式会社 溶接トーチ及びそれを用いたアーク溶接装置

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JPS6217159Y2 (zh) * 1978-06-21 1987-04-30
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JP2690509B2 (ja) * 1988-07-22 1997-12-10 松下電器産業株式会社 アーク溶接装置
JPH106008A (ja) * 1996-06-24 1998-01-13 Matsushita Electric Ind Co Ltd アーク溶接装置
JPH10166145A (ja) * 1996-12-03 1998-06-23 Matsushita Electric Ind Co Ltd Ｔｉｇ溶接機
JP2004119352A (ja) * 2002-09-30 2004-04-15 Sansha Electric Mfg Co Ltd 高電圧電源装置の火花間隙装置

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JPS5731475A (en) * 1980-07-31 1982-02-19 Mitsubishi Electric Corp Mig welding machine
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JP2540116B2 (ja) * 1989-11-16 1996-10-02 松下電器産業株式会社 ア―ク溶接装置
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JPS6217159Y2 (zh) * 1978-06-21 1987-04-30
JP2690509B2 (ja) * 1988-07-22 1997-12-10 松下電器産業株式会社 アーク溶接装置
JPH05104251A (ja) * 1991-03-20 1993-04-27 Komatsu Ltd プラズマ切断機及びその制御方法
JPH106008A (ja) * 1996-06-24 1998-01-13 Matsushita Electric Ind Co Ltd アーク溶接装置
JPH10166145A (ja) * 1996-12-03 1998-06-23 Matsushita Electric Ind Co Ltd Ｔｉｇ溶接機
JP2004119352A (ja) * 2002-09-30 2004-04-15 Sansha Electric Mfg Co Ltd 高電圧電源装置の火花間隙装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020059186A1 (ja) * 2018-09-18 2020-03-26 パナソニックＩｐマネジメント株式会社 溶接トーチ及びそれを用いたアーク溶接装置
JPWO2020059186A1 (ja) * 2018-09-18 2021-08-30 パナソニックＩｐマネジメント株式会社 溶接トーチ及びそれを用いたアーク溶接装置
JP7285415B2 (ja) 2018-09-18 2023-06-02 パナソニックＩｐマネジメント株式会社 溶接トーチ及びそれを用いたアーク溶接装置
JP7482360B2 (ja) 2018-09-18 2024-05-14 パナソニックＩｐマネジメント株式会社 溶接トーチ及びそれを用いたアーク溶接装置

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JPWO2015015759A1 (ja) 2017-03-02
CN105431248B (zh) 2018-05-01
JP6260007B2 (ja) 2018-01-17

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