WO2020235197A1 - Inverter welder - Google Patents

Inverter welder Download PDF

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Publication number
WO2020235197A1
WO2020235197A1 PCT/JP2020/011716 JP2020011716W WO2020235197A1 WO 2020235197 A1 WO2020235197 A1 WO 2020235197A1 JP 2020011716 W JP2020011716 W JP 2020011716W WO 2020235197 A1 WO2020235197 A1 WO 2020235197A1
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Prior art keywords
inverter
waveform
frequency
welding
voltage
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PCT/JP2020/011716
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French (fr)
Japanese (ja)
Inventor
芳行 田畑
憲和 大崎
信介 島林
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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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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 JP2021520071A priority Critical patent/JP7426561B2/en
Priority to CN202080036490.4A priority patent/CN113825581B/en
Publication of WO2020235197A1 publication Critical patent/WO2020235197A1/en

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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
    • B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Definitions

  • This disclosure relates to an inverter welder.
  • the conventional inverter welding machine is equipped with an inverter circuit including a switching element.
  • the inverter welder adjusts the output power from the inverter welder by controlling the switching operation of the switching element (see, for example, Patent Document 1).
  • the welding current is adjusted according to, for example, the thickness of the base metal to be welded.
  • a thyristor welder may be preferred over an inverter welder.
  • the waveform by controlling the waveform with an inverter welding machine, it is possible to suppress the occurrence of spatter and obtain good welding results.
  • the high current region short circuits between the welding wire and the base metal are unlikely to occur except when the arc is started, so that spatter is unlikely to occur. Therefore, the welding result does not change so much whether or not the waveform is controlled by the inverter welding machine.
  • the present invention has been made in view of this point, and an object of the present invention is to enable a single welding machine to switch between an inverter waveform and a thyristor waveform for output.
  • the present disclosure relates to an inverter welding machine that welds a base metal by supplying a welding current to an electrode.
  • the inverter welding machine includes an input detector, a first rectifier, an inverter, a transformer, a second rectifier, a selection unit, and a control unit.
  • the input detector detects the frequency of the input AC voltage and generates a first output signal indicating the detected frequency.
  • the first rectifier rectifies the AC voltage and converts it into a DC voltage.
  • the inverter converts the DC voltage converted by the first rectifier into an AC voltage having a predetermined frequency.
  • the transformer steps down the output voltage of the inverter.
  • the second rectifier rectifies the output voltage stepped down by the transformer and converts it into a DC voltage.
  • the output detector detects the output value of the second rectifier and generates a second output signal indicating the detected output value.
  • the selection unit selects one of a first waveform mode that generates the welding current having an inverter waveform and a second waveform mode that generates the welding current having a thyristor waveform, and the first waveform mode. And generate a third output signal indicating the selected one of the second waveform modes.
  • the control unit determines the on / off time of the inverter corresponding to the one waveform mode selected by the selection unit based on the first output signal, the second output signal, and the third output signal. Then, the inverter is controlled based on the determined on / off time.
  • the selection unit selects one of the first waveform mode (inverter waveform) and the second waveform mode (thyristor waveform).
  • the control unit controls the inverter corresponding to the selected waveform mode.
  • one inverter welder can switch between the inverter waveform and the thyristor waveform according to the request of the welder.
  • the input detector detects the frequency of the AC voltage.
  • the control unit may control the inverter so that the thyristor waveform corresponds to the frequency detected by the input detector (the frequency of the AC voltage at the welding site).
  • the control unit sets the inverter so that the waveform of the welding current becomes the thyristor waveform of 50 Hz (or 60 Hz). Control automatically. Therefore, it is not necessary for the welding operator to manually switch the frequency according to the welding site, and the workability is improved.
  • the inverter welding machine includes, in addition to the inverter welding machine according to the first aspect, a setting unit for setting the current value and frequency of the welding current.
  • the setting unit sets the current value and frequency of the welding current.
  • the control unit can arbitrarily adjust the output waveform of the welding current.
  • a welding worker who is accustomed to welding work in an area where the frequency of AC voltage is 50 Hz may work in an area where the frequency is 60 Hz due to a business trip or the like. Even in this case, the welding operator can obtain the same welding work feeling and welding result as usual by setting the frequency of the welding current to 50 Hz.
  • one welding machine can switch between an inverter waveform and a thyristor waveform.
  • the inverter welding machine 10 supplies a welding current to the electrode 11 to arc weld the base metal 12.
  • the inverter welding machine 10 includes an input terminal 16, an input detector 20, a first rectifier 21, an inverter 22, a transformer 23, a second rectifier 24, a reactor 25, an output detector 26, and a control unit 27. And an input unit 30.
  • the input terminal 16 is connected to the AC power source 15 and receives AC power from the AC power source 15.
  • the input detector 20 detects the frequency of the AC voltage input from the AC power supply 15 and generates a first output signal indicating the detected frequency.
  • the first output signal is transmitted to the control unit 27.
  • the first rectifier 21 is connected to the input terminal 16.
  • the first rectifier 21 rectifies the AC voltage and converts it into a DC voltage.
  • the inverter 22 is connected to the first rectifier 21.
  • the inverter 22 converts the DC voltage converted by the first rectifier 21 into an AC voltage having a predetermined frequency.
  • the inverter 22 includes a plurality of switching elements (not shown). The inverter 22 adjusts the output by switching the on / off operation of these plurality of switching elements.
  • the transformer 23 is connected to the inverter 22.
  • the transformer 23 steps down the output voltage of the inverter 22.
  • the second rectifier 24 is connected to the transformer 23.
  • the second rectifier 24 rectifies the output voltage stepped down by the transformer 23 and converts it into a DC voltage.
  • the reactor 25 is connected to the second rectifier 24.
  • the reactor 25 smoothes the output of the second rectifier 24.
  • the output detector 26 detects the output value of the second rectifier 24 and generates a second output signal indicating the detected output value.
  • the output values are, for example, the welding current and the welding voltage supplied between the electrode 11 and the base metal 12.
  • the second output signal is transmitted to the control unit 27.
  • the input unit 30 is, for example, a user interface including a touch panel and a switch.
  • the input unit 30 receives various set values by the operation of the operator.
  • the input unit 30 includes a selection unit 31 and a setting unit 32.
  • the selection unit 31 selectively switches the waveform mode so that the waveform of the welding current supplied to the electrode 11 becomes an inverter waveform or a thyristor waveform. Specifically, the selection unit 31 selects one of a first waveform mode that generates a welding current having an inverter waveform and a second waveform mode that generates a welding current having a thyristor waveform. The selection unit 31 further generates a third output signal indicating the selected one of the first waveform mode and the second waveform mode. The third output signal is transmitted to the control unit 27.
  • the setting unit 32 sets the current value and frequency of the welding current.
  • the control unit 27 outputs a control signal to the inverter 22 and feedback-controls the operation of the inverter 22 so that welding power for appropriately performing arc welding can be obtained.
  • control unit 27 receives the first output signal from the input detector 20, the second output signal from the output detector 26, and the third output signal from the selection unit 31.
  • the control unit 27 determines the on / off time of the inverter 22 corresponding to one waveform mode selected by the selection unit 31, and controls the inverter 22 based on the determined on / off time.
  • the on / off time is, for example, the duty ratio used in pulse width modulation.
  • the control unit 27 has a very high frequency (several tens of kHz, for example, several tens of kHz).
  • a control signal is output at any frequency in the range of 10 kHz to 100 kHz) to control the inverter 22.
  • Welding currents with inverter waveforms include pulsating currents with any frequency in the range 20 kHz to 200 kHz and a first amplitude.
  • the control unit 27 receives the first output signal from the input detector 20.
  • the frequency of the welding current is determined based on.
  • Welding currents with thyristor waveforms include pulsating currents with frequencies of 100 Hz or 120 Hz and a second amplitude. The second amplitude is larger than the first amplitude.
  • a 50 Hz thyristor waveform contains a pulsating current having a frequency of 100 Hz.
  • the 60 Hz thyristor waveform contains a pulsating current with a frequency of 120 Hz.
  • the frequency of the AC power supply is 50 Hz in eastern Japan and 60 Hz in western Japan.
  • the input detector 20 detects an AC voltage of 50 Hz.
  • the control unit 27 determines the on / off time of the inverter 22 so that a thyristor waveform having a frequency of 50 Hz (including a pulsating current having a frequency of 100 Hz) can be obtained.
  • the control unit 27 controls the inverter 22 by outputting a control signal based on the determined on / off time to the inverter 22. As a result, as shown in FIG. 2, it is possible to obtain a thyristor waveform in which the welding current repeatedly fluctuates based on the set current value (300 A).
  • the inverter welding machine 10 can switch between the inverter waveform and the thyristor waveform according to the request of the welding operator.
  • the input detector 20 detects the frequency of the AC voltage.
  • the control unit 27 can control the inverter 22 so that the thyristor waveform corresponds to the frequency detected by the input detector 20 (the frequency of the AC voltage at the welding site). Therefore, it is not necessary for the welding operator to manually switch the frequency according to the welding site, and the workability is improved.
  • the output waveform of the welding current can be arbitrarily adjusted by setting the current value and frequency of the welding current by the setting unit 32.
  • a welding worker who is accustomed to welding work in an area where the frequency of AC voltage is 50 Hz may work in an area where the frequency is 60 Hz due to a business trip or the like. Even in this case, the welding operator can obtain the same welding work feeling and welding result as usual by setting the frequency of the welding current to 50 Hz.
  • the frequency may be adjusted steplessly in the setting unit 32.
  • the present disclosure is extremely useful and has industrial applicability because a highly practical effect of being able to switch between an inverter waveform and a thyristor waveform can be obtained with a single welding machine. high.
  • Inverter welding machine 11 Electrode 12 Base material 20 Input detector 21 1st rectifier 22 Inverter 23 Transformer 24 2nd rectifier 26 Output detector 27 Control unit 30 Input unit 31 Selection unit 32 Setting unit

Abstract

An input detector detects the frequency of an input alternating current voltage, and generates a first output signal indicating the detected frequency. An output detector detects an output value, and generates a second output signal indicating the detected output value. A selecting unit selects one of a first waveform mode which generates a welding current having an inverter waveform, and a second waveform mode which generates a welding current having a thyristor waveform, and generates a third output signal indicating which of the first waveform mode and the second waveform mode has been selected. A control unit controls an inverter in accordance with the waveform mode selected by the selecting unit, on the basis of the first output signal from the input detector, the second output signal from the output detector, and the third output signal from the selecting unit.

Description

インバータ溶接機Inverter welder
　本開示は、インバータ溶接機に関するものである。 This disclosure relates to an inverter welder.
　従来のインバータ溶接機は、スイッチング素子を含むインバータ回路を備える。インバータ溶接機は、スイッチング素子のスイッチング動作を制御することで、インバータ溶接機からの出力電力を調整する（例えば、特許文献１参照）。 The conventional inverter welding machine is equipped with an inverter circuit including a switching element. The inverter welder adjusts the output power from the inverter welder by controlling the switching operation of the switching element (see, for example, Patent Document 1).
　このようなインバータ溶接機は、従来のサイリスタ溶接機に比べて、高周波制御による応答速度が向上し、これにより細かい波形制御が可能となっている。そのため、近年では、サイリスタ溶接機からインバータ溶接機への置き換えが進められている。 Compared with the conventional thyristor welder, such an inverter welder has improved response speed by high frequency control, which enables fine waveform control. Therefore, in recent years, the replacement of thyristor welding machines with inverter welding machines has been promoted.
特開平２－２６８９７０号公報Japanese Unexamined Patent Publication No. 2-268970
　溶接電流は、例えば、溶接される母材の板厚に応じて調整される。溶接電流の電流域によってはインバータ溶接機よりもサイリスタ溶接機が好まれる場合がある。例えば、低電流域では、インバータ溶接機による波形制御を行うことで、スパッタの発生を抑え、良好な溶接結果を得ることができる。一方、高電流域では、アーク起動時を除いて溶接ワイヤと母材との短絡が生じ難いので、スパッタが発生しにくい。そのため、インバータ溶接機による波形制御を行っても行わなくても、溶接結果がそれほど変わらない。 The welding current is adjusted according to, for example, the thickness of the base metal to be welded. Depending on the current range of the welding current, a thyristor welder may be preferred over an inverter welder. For example, in the low current region, by controlling the waveform with an inverter welding machine, it is possible to suppress the occurrence of spatter and obtain good welding results. On the other hand, in the high current region, short circuits between the welding wire and the base metal are unlikely to occur except when the arc is started, so that spatter is unlikely to occur. Therefore, the welding result does not change so much whether or not the waveform is controlled by the inverter welding machine.
　そのため、例えば、母材の板厚が大きく、高電流域で溶接を行う現場（例えば、造船所）では、慣れ親しんだサイリスタ溶接機を使いたいという熟練溶接工の要望がある。 Therefore, for example, at a site where the base metal is thick and welding is performed in a high current range (for example, a shipyard), there is a demand from a skilled welder who wants to use a familiar thyristor welder.
　しかしながら、インバータ溶接機とサイリスタ溶接機を両方とも、現場の要望に合わせて複数台用意することは、コストアップになるとともに、溶接機の保管場所を確保する必要があり、好ましくない。 However, it is not preferable to prepare multiple inverter welding machines and thyristor welding machines according to the demands of the site because it increases the cost and it is necessary to secure a storage place for the welding machines.
　本発明は、かかる点に鑑みてなされたものであり、その目的は、１台の溶接機で、インバータ波形とサイリスタ波形とを切り替えて出力できるようにすることにある。 The present invention has been made in view of this point, and an object of the present invention is to enable a single welding machine to switch between an inverter waveform and a thyristor waveform for output.
　本開示は、電極に溶接電流を供給して母材を溶接するインバータ溶接機に関する。 The present disclosure relates to an inverter welding machine that welds a base metal by supplying a welding current to an electrode.
　第１の態様に係るインバータ溶接機は、入力検出器、第１整流器、インバータ、トランス、第２整流器、選択部、および、制御部を備える。入力検出器は、入力された交流電圧の周波数を検出して、検出された周波数を示す第１出力信号を生成する。第１整流器は、交流電圧を整流して直流電圧に変換する。インバータは、第１整流器で変換された直流電圧を所定の周波数の交流電圧に変換する。トランスは、前記インバータの出力電圧を降圧する。第２整流器は、前記トランスで降圧された出力電圧を整流して直流電圧に変換する。出力検出器は、前記第２整流器の出力値を検出して、検出された出力値を示す第２出力信号を生成する。選択部は、インバータ波形を有する前記溶接電流を生成する第１の波形モードとサイリスタ波形を有する前記溶接電流を生成する第２の波形モードのうちの一つを選択し、前記第１の波形モードと前記第２の波形モードのうちの選択された一つを示す第３出力信号を生成する。制御部は、前記第１出力信号と、前記第２出力信号と、前記第３出力信号とに基づいて、前記選択部で選択された前記一つの波形モードに対応した前記インバータのオンオフタイムを決定して、決定されたオンオフタイムに基づいて前記インバータを制御する。 The inverter welding machine according to the first aspect includes an input detector, a first rectifier, an inverter, a transformer, a second rectifier, a selection unit, and a control unit. The input detector detects the frequency of the input AC voltage and generates a first output signal indicating the detected frequency. The first rectifier rectifies the AC voltage and converts it into a DC voltage. The inverter converts the DC voltage converted by the first rectifier into an AC voltage having a predetermined frequency. The transformer steps down the output voltage of the inverter. The second rectifier rectifies the output voltage stepped down by the transformer and converts it into a DC voltage. The output detector detects the output value of the second rectifier and generates a second output signal indicating the detected output value. The selection unit selects one of a first waveform mode that generates the welding current having an inverter waveform and a second waveform mode that generates the welding current having a thyristor waveform, and the first waveform mode. And generate a third output signal indicating the selected one of the second waveform modes. The control unit determines the on / off time of the inverter corresponding to the one waveform mode selected by the selection unit based on the first output signal, the second output signal, and the third output signal. Then, the inverter is controlled based on the determined on / off time.
　第１の態様に係るインバータ溶接機は、選択部が第１の波形モード（インバータ波形）と第２の波形モード（サイリスタ波形）のうちの一つを選択する。制御部は、選択された波形モードに対応して、インバータを制御する。 In the inverter welding machine according to the first aspect, the selection unit selects one of the first waveform mode (inverter waveform) and the second waveform mode (thyristor waveform). The control unit controls the inverter corresponding to the selected waveform mode.
　これにより、１台のインバータ溶接機が、溶接作業者の要望に合わせて、インバータ波形とサイリスタ波形とを切り替えることができる。 As a result, one inverter welder can switch between the inverter waveform and the thyristor waveform according to the request of the welder.
　また、入力検出器は、交流電圧の周波数を検出する。制御部は、入力検出器により検出された周波数（溶接現場の交流電圧の周波数）に応じたサイリスタ波形となるように、インバータを制御してもよい。 Also, the input detector detects the frequency of the AC voltage. The control unit may control the inverter so that the thyristor waveform corresponds to the frequency detected by the input detector (the frequency of the AC voltage at the welding site).
　世界的には、交流電圧の周波数が５０Ｈｚの地域と、交流電圧の周波数が６０Ｈｚの地域とがある。例えば、交流電圧の周波数が５０Ｈｚ（又は６０Ｈｚ）の地域において、サイリスタ波形モードが選択された場合に、制御部は、溶接電流の波形が５０Ｈｚ（又は６０Ｈｚ）のサイリスタ波形となるように、インバータを自動的に制御する。そのため、溶接作業者が溶接現場に合わせた周波数の切り替えを手動で行う必要が無く、作業性が向上する。 In the world, there are areas where the frequency of AC voltage is 50Hz and areas where the frequency of AC voltage is 60Hz. For example, in a region where the frequency of the AC voltage is 50 Hz (or 60 Hz), when the thyristor waveform mode is selected, the control unit sets the inverter so that the waveform of the welding current becomes the thyristor waveform of 50 Hz (or 60 Hz). Control automatically. Therefore, it is not necessary for the welding operator to manually switch the frequency according to the welding site, and the workability is improved.
　第２の態様に係るインバータ溶接機は、第１の態様に係るインバータ溶接機に加えて、前記溶接電流の電流値及び周波数を設定する設定部を備える。 The inverter welding machine according to the second aspect includes, in addition to the inverter welding machine according to the first aspect, a setting unit for setting the current value and frequency of the welding current.
　第２の態様に係るインバータ溶接機は、設定部が、溶接電流の電流値及び周波数を設定する。制御部は、溶接電流の出力波形を任意に調整することができる。 In the inverter welding machine according to the second aspect, the setting unit sets the current value and frequency of the welding current. The control unit can arbitrarily adjust the output waveform of the welding current.
　例えば、交流電圧の周波数が５０Ｈｚの地域での溶接作業に慣れた溶接作業者が、出張などによって、周波数が６０Ｈｚの地域で作業する場合がある。この場合でも、溶接作業者は、溶接電流の周波数を５０Ｈｚに設定することで、普段と同様の溶接施工感覚や溶接結果を得ることができる。 For example, a welding worker who is accustomed to welding work in an area where the frequency of AC voltage is 50 Hz may work in an area where the frequency is 60 Hz due to a business trip or the like. Even in this case, the welding operator can obtain the same welding work feeling and welding result as usual by setting the frequency of the welding current to 50 Hz.
　本開示によれば、１台の溶接機が、インバータ波形とサイリスタ波形とを切り替えることができる。 According to the present disclosure, one welding machine can switch between an inverter waveform and a thyristor waveform.
実施形態に係るインバータ溶接機の構成を示すブロック図である。It is a block diagram which shows the structure of the inverter welding machine which concerns on embodiment. サイリスタ波形とインバータ波形とを示すグラフである。It is a graph which shows the thyristor waveform and the inverter waveform.
　以下、本開示の実施形態を図面に基づいて説明する。なお、以下の好ましい実施形態の説明は、本質的に例示に過ぎず、本開示、その適用物或いはその用途を制限することを意図するものではない。 Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely an example and is not intended to limit the present disclosure, its application or its use.
　図１に示すように、インバータ溶接機１０は、電極１１に溶接電流を供給して母材１２をアーク溶接するものである。 As shown in FIG. 1, the inverter welding machine 10 supplies a welding current to the electrode 11 to arc weld the base metal 12.
　インバータ溶接機１０は、入力端子１６と、入力検出器２０と、第１整流器２１と、インバータ２２と、トランス２３と、第２整流器２４と、リアクトル２５と、出力検出器２６と、制御部２７と、入力部３０とを備えている。 The inverter welding machine 10 includes an input terminal 16, an input detector 20, a first rectifier 21, an inverter 22, a transformer 23, a second rectifier 24, a reactor 25, an output detector 26, and a control unit 27. And an input unit 30.
　入力端子１６は、交流電源１５に接続されており、交流電源１５から交流電力を受ける。 The input terminal 16 is connected to the AC power source 15 and receives AC power from the AC power source 15.
　入力検出器２０は、交流電源１５から入力された交流電圧の周波数を検出し、検出された周波数を示す第１出力信号を生成する。第１出力信号は、制御部２７に送信される。 The input detector 20 detects the frequency of the AC voltage input from the AC power supply 15 and generates a first output signal indicating the detected frequency. The first output signal is transmitted to the control unit 27.
　第１整流器２１は、入力端子１６に接続されている。第１整流器２１は、交流電圧を整流して直流電圧に変換する。インバータ２２は、第１整流器２１に接続されている。インバータ２２は、第１整流器２１で変換された直流電圧を所定の周波数の交流電圧に変換する。具体的に、インバータ２２は、図示しない複数のスイッチング素子を含む。インバータ２２は、これらの複数のスイッチング素子のオンオフ動作を切り替えることで、出力を調整する。 The first rectifier 21 is connected to the input terminal 16. The first rectifier 21 rectifies the AC voltage and converts it into a DC voltage. The inverter 22 is connected to the first rectifier 21. The inverter 22 converts the DC voltage converted by the first rectifier 21 into an AC voltage having a predetermined frequency. Specifically, the inverter 22 includes a plurality of switching elements (not shown). The inverter 22 adjusts the output by switching the on / off operation of these plurality of switching elements.
　トランス２３は、インバータ２２に接続されている。トランス２３は、インバータ２２の出力電圧を降圧する。第２整流器２４は、トランス２３に接続されている。第２整流器２４は、トランス２３で降圧された出力電圧を整流して直流電圧に変換する。リアクトル２５は、第２整流器２４に接続されている。リアクトル２５は、第２整流器２４の出力を平滑化する。 The transformer 23 is connected to the inverter 22. The transformer 23 steps down the output voltage of the inverter 22. The second rectifier 24 is connected to the transformer 23. The second rectifier 24 rectifies the output voltage stepped down by the transformer 23 and converts it into a DC voltage. The reactor 25 is connected to the second rectifier 24. The reactor 25 smoothes the output of the second rectifier 24.
　出力検出器２６は、第２整流器２４の出力値を検出し、検出された出力値を示す第２出力信号を生成する。出力値は、例えば、電極１１と母材１２との間に供給される溶接電流及び溶接電圧である。第２出力信号は、制御部２７に送信される。 The output detector 26 detects the output value of the second rectifier 24 and generates a second output signal indicating the detected output value. The output values are, for example, the welding current and the welding voltage supplied between the electrode 11 and the base metal 12. The second output signal is transmitted to the control unit 27.
　入力部３０は、例えば、タッチパネルやスイッチを含むユーザインターフェイスである。入力部３０は、作業者の操作によって各種の設定値を受け付ける。入力部３０は、選択部３１と、設定部３２とを備えている。 The input unit 30 is, for example, a user interface including a touch panel and a switch. The input unit 30 receives various set values by the operation of the operator. The input unit 30 includes a selection unit 31 and a setting unit 32.
　選択部３１は、電極１１に供給する溶接電流の波形がインバータ波形又はサイリスタ波形となるように、波形モードを選択的に切り替える。具体的には、選択部３１は、インバータ波形を有する溶接電流を生成する第１の波形モードとサイリスタ波形を有する溶接電流を生成する第２の波形モードのうちの一つを選択する。選択部３１は、さらに、第１の波形モードと第２の波形モードのうちの選択された一つを示す第３出力信号を生成する。第３出力信号は、制御部２７に送信される。 The selection unit 31 selectively switches the waveform mode so that the waveform of the welding current supplied to the electrode 11 becomes an inverter waveform or a thyristor waveform. Specifically, the selection unit 31 selects one of a first waveform mode that generates a welding current having an inverter waveform and a second waveform mode that generates a welding current having a thyristor waveform. The selection unit 31 further generates a third output signal indicating the selected one of the first waveform mode and the second waveform mode. The third output signal is transmitted to the control unit 27.
　設定部３２は、溶接電流の電流値及び周波数を設定する。 The setting unit 32 sets the current value and frequency of the welding current.
　制御部２７は、アーク溶接を適切に行うための溶接電力が得られるように、インバータ２２に対して制御信号を出力し、インバータ２２の動作をフィードバック制御する。 The control unit 27 outputs a control signal to the inverter 22 and feedback-controls the operation of the inverter 22 so that welding power for appropriately performing arc welding can be obtained.
　具体的に、制御部２７は、入力検出器２０からの第１出力信号と、出力検出器２６からの第２出力信号と、選択部３１からの第３出力信号とを受信する。制御部２７は、選択部３１で選択された一つの波形モードに対応したインバータ２２のオンオフタイムを決定して、決定されたオンオフタイムに基づいてインバータ２２を制御する。オンオフタイムとは、例えば、パルス幅変調で使用されるデューティ比のことである。 Specifically, the control unit 27 receives the first output signal from the input detector 20, the second output signal from the output detector 26, and the third output signal from the selection unit 31. The control unit 27 determines the on / off time of the inverter 22 corresponding to one waveform mode selected by the selection unit 31, and controls the inverter 22 based on the determined on / off time. The on / off time is, for example, the duty ratio used in pulse width modulation.
　例えば、設定部３２で電流値が３００Ａに設定され、選択部３１で第１の波形モード（インバータ波形）が選択された場合には、制御部２７は、非常に高い周波数（数十ｋＨｚ、例えば、１０ｋＨｚから１００ｋＨｚまでの範囲のいずれかの周波数）で制御信号を出力し、インバータ２２を制御する。これにより、図２に示すように、溶接電流が３００Ａで略一定となるようなインバータ波形を得ることができる。インバータ波形を有する溶接電流は、２０ｋＨｚから２００ｋＨｚまでの範囲のいずれかの周波数および第１の振幅を有する脈流を含む。 For example, when the current value is set to 300 A by the setting unit 32 and the first waveform mode (inverter waveform) is selected by the selection unit 31, the control unit 27 has a very high frequency (several tens of kHz, for example, several tens of kHz). A control signal is output at any frequency in the range of 10 kHz to 100 kHz) to control the inverter 22. As a result, as shown in FIG. 2, it is possible to obtain an inverter waveform such that the welding current is substantially constant at 300 A. Welding currents with inverter waveforms include pulsating currents with any frequency in the range 20 kHz to 200 kHz and a first amplitude.
　一方、設定部３２で電流値が３００Ａに設定され、選択部３１で第２の波形モード（サイリスタ波形）が選択された場合には、制御部２７は、入力検出器２０からの第１出力信号に基づいて、溶接電流の周波数を決定する。サイリスタ波形を有する溶接電流は、１００Ｈｚまたは１２０Ｈｚの周波数および第２の振幅を有する脈流を含む。第２の振幅は、第１の振幅よりも大きい。例えば、５０Ｈｚのサイリスタ波形は、１００Ｈｚの周波数を有する脈流を含む。６０Ｈｚのサイリスタ波形は、１２０Ｈｚの周波数を有する脈流を含む。 On the other hand, when the current value is set to 300 A by the setting unit 32 and the second waveform mode (thyristor waveform) is selected by the selection unit 31, the control unit 27 receives the first output signal from the input detector 20. The frequency of the welding current is determined based on. Welding currents with thyristor waveforms include pulsating currents with frequencies of 100 Hz or 120 Hz and a second amplitude. The second amplitude is larger than the first amplitude. For example, a 50 Hz thyristor waveform contains a pulsating current having a frequency of 100 Hz. The 60 Hz thyristor waveform contains a pulsating current with a frequency of 120 Hz.
　例えば、交流電源の周波数は、東日本では５０Ｈｚ、西日本では６０Ｈｚである。インバータ溶接機１０が東日本の現場に設置された場合には、入力検出器２０は、５０Ｈｚの交流電圧を検出する。 For example, the frequency of the AC power supply is 50 Hz in eastern Japan and 60 Hz in western Japan. When the inverter welding machine 10 is installed at a site in eastern Japan, the input detector 20 detects an AC voltage of 50 Hz.
　制御部２７は、周波数５０Ｈｚのサイリスタ波形（１００Ｈｚの周波数を有する脈流を含む）が得られるように、インバータ２２のオンオフタイムを決定する。制御部２７は決定されたオンオフタイムに基づく制御信号をインバータ２２に出力することにより、インバータ２２を制御する。これにより、図２に示すように、設定された電流値（３００Ａ）を基準に溶接電流が繰り返し上下するようなサイリスタ波形を得ることができる。 The control unit 27 determines the on / off time of the inverter 22 so that a thyristor waveform having a frequency of 50 Hz (including a pulsating current having a frequency of 100 Hz) can be obtained. The control unit 27 controls the inverter 22 by outputting a control signal based on the determined on / off time to the inverter 22. As a result, as shown in FIG. 2, it is possible to obtain a thyristor waveform in which the welding current repeatedly fluctuates based on the set current value (300 A).
　以上のように、本実施形態に係るインバータ溶接機１０は、溶接作業者の要望に合わせて、インバータ波形とサイリスタ波形とを切り替えることができる。 As described above, the inverter welding machine 10 according to the present embodiment can switch between the inverter waveform and the thyristor waveform according to the request of the welding operator.
　また、入力検出器２０は、交流電圧の周波数を検出する。制御部２７は、入力検出器２０により検出された周波数（溶接現場の交流電圧の周波数）に応じたサイリスタ波形となるように、インバータ２２を制御することができる。そのため、溶接作業者が溶接現場に合わせた周波数の切り替えを手動で行う必要が無く、作業性が向上する。 Further, the input detector 20 detects the frequency of the AC voltage. The control unit 27 can control the inverter 22 so that the thyristor waveform corresponds to the frequency detected by the input detector 20 (the frequency of the AC voltage at the welding site). Therefore, it is not necessary for the welding operator to manually switch the frequency according to the welding site, and the workability is improved.
　また、設定部３２によって、溶接電流の電流値及び周波数を設定することで、溶接電流の出力波形を任意に調整することができる。 Further, the output waveform of the welding current can be arbitrarily adjusted by setting the current value and frequency of the welding current by the setting unit 32.
　例えば、交流電圧の周波数が５０Ｈｚの地域での溶接作業に慣れた溶接作業者が、出張などによって、周波数が６０Ｈｚの地域で作業する場合がある。この場合でも、溶接作業者は、溶接電流の周波数を５０Ｈｚに設定することで、普段と同様の溶接施工感覚や溶接結果を得ることができる。 For example, a welding worker who is accustomed to welding work in an area where the frequency of AC voltage is 50 Hz may work in an area where the frequency is 60 Hz due to a business trip or the like. Even in this case, the welding operator can obtain the same welding work feeling and welding result as usual by setting the frequency of the welding current to 50 Hz.
　なお、設定部３２において、周波数を無段階に調整できるようにしてもよい。 The frequency may be adjusted steplessly in the setting unit 32.
　以上説明したように、本開示は、１台の溶接機で、インバータ波形とサイリスタ波形とを切り替えることができるという実用性の高い効果が得られることから、きわめて有用で産業上の利用可能性は高い。 As described above, the present disclosure is extremely useful and has industrial applicability because a highly practical effect of being able to switch between an inverter waveform and a thyristor waveform can be obtained with a single welding machine. high.
　１０　　インバータ溶接機
　１１　　電極
　１２　　母材
　２０　　入力検出器
　２１　　第１整流器
　２２　　インバータ
　２３　　トランス
　２４　　第２整流器
　２６　　出力検出器
　２７　　制御部
　３０　　入力部
　３１　　選択部
　３２　　設定部 10 Inverter welding machine 11 Electrode 12 Base material 20 Input detector 21 1st rectifier 22 Inverter 23 Transformer 24 2nd rectifier 26 Output detector 27 Control unit 30 Input unit 31 Selection unit 32 Setting unit

Claims (3)

  1. 　電極に溶接電流を供給して母材を溶接するインバータ溶接機であって、
    　入力された交流電圧の周波数を検出して、検出された周波数を示す第１出力信号を生成する入力検出器と、
    　前記交流電圧を整流して直流電圧に変換する第１整流器と、
    　前記第１整流器で変換された直流電圧を所定の周波数の交流電圧に変換するインバータと、
    　前記インバータの出力電圧を降圧するトランスと、
    　前記トランスで降圧された出力電圧を整流して直流電圧に変換する第２整流器と、
    　前記第２整流器の出力値を検出して、検出された出力値を示す第２出力信号を生成する出力検出器と、
    　インバータ波形を有する前記溶接電流を生成する第１の波形モードとサイリスタ波形を有する前記溶接電流を生成する第２の波形モードのうちの一つを選択し、前記第１の波形モードと前記第２の波形モードのうちの選択された一つを示す第３出力信号を生成する選択部と、
    　前記第１出力信号と、前記第２出力信号と、前記第３出力信号とに基づいて、前記選択部で選択された前記一つの波形モードに対応した前記インバータのオンオフタイムを決定して、決定された前記オンオフタイムに基づいて前記インバータを制御する制御部とを備えたインバータ溶接機。     An inverter welding machine that supplies a welding current to the electrodes to weld the base metal.
    An input detector that detects the frequency of the input AC voltage and generates a first output signal indicating the detected frequency.
    A first rectifier that rectifies the AC voltage and converts it into a DC voltage,
    An inverter that converts the DC voltage converted by the first rectifier into an AC voltage of a predetermined frequency,
    A transformer that steps down the output voltage of the inverter,
    A second rectifier that rectifies the output voltage stepped down by the transformer and converts it into a DC voltage,
    An output detector that detects the output value of the second rectifier and generates a second output signal indicating the detected output value.
    One of the first waveform mode for generating the welding current having an inverter waveform and the second waveform mode for generating the welding current having a thyristor waveform is selected, and the first waveform mode and the second waveform mode are selected. A selection unit that generates a third output signal indicating one of the selected waveform modes of
    Based on the first output signal, the second output signal, and the third output signal, the on / off time of the inverter corresponding to the one waveform mode selected by the selection unit is determined and determined. An inverter welding machine including a control unit that controls the inverter based on the on / off time.
  2. 　請求項１において、
    　前記溶接電流の電流値及び周波数を設定する設定部を備えたインバータ溶接機。     In claim 1,
    An inverter welding machine provided with a setting unit for setting the current value and frequency of the welding current.
  3. 　請求項１において、
    　前記インバータ波形を有する前記溶接電流は、２０ｋＨｚから２００ｋＨｚまでの範囲のいずれかの周波数および第１の振幅を有する脈流を含み、
    　前記サイリスタ波形を有する前記溶接電流は、１００Ｈｚまたは１２０Ｈｚの周波数および第1の振幅よりも大きな第２の振幅を有する脈流を含む、インバータ溶接機。     In claim 1,
    The welding current having the inverter waveform includes a pulsating current having any frequency in the range of 20 kHz to 200 kHz and a first amplitude.
    The inverter welding machine, wherein the welding current having the thyristor waveform includes a frequency of 100 Hz or 120 Hz and a pulsating current having a second amplitude larger than the first amplitude.
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JPS54114452A (en) * 1978-02-27 1979-09-06 Shinko Electric Co Ltd Welding current controlling method of high frequency arc welding machine
JP2002126874A (en) * 2001-08-13 2002-05-08 Sansha Electric Mfg Co Ltd Manufacturing method for welding power supply device
JP2003340573A (en) * 2002-05-29 2003-12-02 Daihen Corp Power unit for arc machining

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