JP2631178B2 - DC arc welding equipment and plasma cutting equipment - Google Patents
DC arc welding equipment and plasma cutting equipmentInfo
- Publication number
- JP2631178B2 JP2631178B2 JP22541892A JP22541892A JP2631178B2 JP 2631178 B2 JP2631178 B2 JP 2631178B2 JP 22541892 A JP22541892 A JP 22541892A JP 22541892 A JP22541892 A JP 22541892A JP 2631178 B2 JP2631178 B2 JP 2631178B2
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- Prior art keywords
- power supply
- arc
- base material
- electrode
- voltage
- Prior art date
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- Arc Welding Control (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電極と母材の間に非接
触で直流アークを発生させ、電波障害をなくした直流ア
ーク溶接装置およびプラズマ切断装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direct current arc welding apparatus and a plasma cutting apparatus in which a direct current arc is generated in a non-contact manner between an electrode and a base material to eliminate radio wave interference.
【０００２】[0002]
【従来の技術】従来、直流アーク溶接装置およびプラズ
マ切断装置（以下、溶接装置という）においては、特開
平１−１５４８７０号公報に示されたように、アーク起
動時にのみ電極と母材の間に高周波電力を印加して非接
触でアーク起動させるようにしている。2. Description of the Related Art Conventionally, in a direct current arc welding apparatus and a plasma cutting apparatus (hereinafter, referred to as a welding apparatus), as shown in Japanese Patent Application Laid-Open No. 1-154870, only when an arc is started, a distance between an electrode and a base material is increased. High-frequency power is applied to start the arc in a non-contact manner.
【０００３】以下、この種の溶接装置の構成について図
７を参照しながら説明する。図において、装置が駆動さ
れるとスイッチ２１が閉路されて高周波発生装置２２か
ら高周波電力がカップリングコイル２３に給電される。
これにより、カップリングコイル２３は直流電源装置２
４から電極２５と母材２６に給電される直流電力に高周
波電力を重畳する。そして、高周波電力により図８に示
したｔ1 でアーク起動され、直流電源装置２４からの給
電電力により定常アークが形成される。このアーク発生
を出力電圧検出回路２７が検出して高周波出力信号回路
２８に信号を送り、スイッチ２１を開路して図８で示し
たｔ2 で高周波発生装置２２の動作を停止させるように
している。そして、再点弧失敗時にのみ高周波電力を発
生して、常にアーク切れのない安定した交流電流を母材
と電極２６の間に給電することができるというものであ
る。なお、図８では電圧の状態を模式的に示している。 Hereinafter, the configuration of this type of welding apparatus will be described with reference to FIG. In the figure, when the device is driven, the switch 21 is closed and high frequency power is supplied from the high frequency generator 22 to the coupling coil 23.
Thereby, the coupling coil 23 is connected to the DC power supply 2
The high frequency power is superimposed on the DC power supplied from 4 to the electrode 25 and the base material 26. Then, the arc is started at t 1 shown in FIG. 8 by the high frequency power, and a steady arc is formed by the power supplied from the DC power supply 24. The output voltage detection circuit 27 detects this arc and sends a signal to the high frequency output signal circuit 28 to open the switch 21 and stop the operation of the high frequency generator 22 at t 2 shown in FIG. . Then, high-frequency power is generated only when re-ignition has failed, and a stable alternating current without arc break can always be supplied between the base material and the electrode 26. FIG. 8 schematically shows a voltage state.
【０００４】[0004]
【発明が解決しようとする課題】このような従来の構成
の溶接装置では、アーク起動を高周波電力で行うため、
図９に示したように高周波電圧が再点弧ごとに発生し、
無負荷時には図４に示したように輻射雑音電界強度が約
５０dBμＶに達する輻射ノイズを発生するものであっ
た。In such a conventional welding apparatus, the arc is started with high-frequency power.
As shown in FIG. 9, a high-frequency voltage is generated at each re-ignition,
At the time of no load, as shown in FIG. 4, a radiation noise having a radiation noise electric field intensity of about 50 dBμV was generated.
【０００５】従って、周辺のテレビやラジオ、あるいは
エレクトロニクス機器への電波障害を与えることはもち
ろん、自ら高周波誤動作を引き起こし、ひいては破壊に
至るということや、高周波勢力が強すぎるために電極表
面を荒し、アーク起動の繰り返し時の起動特性を損ねる
ということがあった。また、中心周波数が約１ＭＨｚの
高周波であるため、２次側ケーブルの延長時に高周波が
途中でリークしてトーチの先端まで届かず、図５に示し
たように、延長ケーブルが約５０ｍ以上になるとアーク
起動しない等、数々の問題があった。[0005] Therefore, it not only causes radio interference to nearby televisions, radios, or electronic equipment, but also causes high-frequency malfunctions by itself, leading to destruction, and roughening of the electrode surface due to too strong high-frequency power. In some cases, the starting characteristics during repeated arc starting are impaired. Also, since the center frequency is a high frequency of about 1 MHz, when the secondary cable is extended, the high frequency leaks on the way and does not reach the tip of the torch, and as shown in FIG. There were many problems, such as the arc not starting.
【０００６】このような問題に対しては、直流電源を用
いてアーク起動する方式のものが有利であり、たとえ
ば、特開昭５６−８６６７９号公報に示されたような構
成のものが知られている。In order to solve such a problem, a system in which an arc is started using a DC power supply is advantageous. For example, a system as disclosed in Japanese Patent Application Laid-Open No. 56-86679 is known. ing.
【０００７】この構成のものは、図１０に示したよう
に、溶接負荷４１の両端に第１の直流電源装置４２のリ
アクトル４３を介さずに、無負荷時の電圧と出力短絡時
の出力電流との積が１２０００ＶＡ〜７５０００ＶＡの
電力を第２の直流電源装置４４から供給してアーク起動
させ、アーク発生後、スイッチング素子４５を開路して
第２の直流電源装置４４からの電力を停止させ、第１の
直流電源装置４２から溶接負荷４１に電力を供給すると
いうもので、これにより、アーク起動特性を改善するこ
とができるというものである。In this configuration, as shown in FIG. 10, the voltage at the time of no load and the output current at the time of output short-circuiting do not pass through the reactor 43 of the first DC power supply 42 at both ends of the welding load 41. The power of 12000 VA to 75000 VA is supplied from the second DC power supply 44 to start the arc, and after the arc is generated, the switching element 45 is opened to stop the power from the second DC power supply 44, Electric power is supplied from the first DC power supply device 42 to the welding load 41, whereby the arc starting characteristics can be improved.
【０００８】しかし、この構成のものは、電極と母材を
接触させて大電力を供給し、そのジュール熱によってア
ーク起動させる接触アーク起動の直流アーク溶接機であ
って、非接触アーク起動の直流アーク溶接装置に適用で
きるものではなかった。However, this configuration is a contact-arc-activated DC arc welding machine in which a large power is supplied by bringing an electrode into contact with a base material and an arc is activated by the Joule heat. It was not applicable to arc welding equipment.
【０００９】本発明は上記課題を解決するもので、アー
ク起動時の輻射ノイズをなくすることができるととも
に、２次側ケーブルを長く延長しても確実にアーク起動
することができる直流アーク溶接装置およびプラズマ切
断装置を提供することを目的としている。SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and can eliminate a radiation noise at the time of starting an arc and can reliably start an arc even when a secondary cable is extended for a long time. And a plasma cutting device.
【００１０】[0010]
【課題を解決するための手段】本発明は上記目的を達成
するために、電極と母材の間に直流電流を給電する第１
の直流電源装置と、前記第１の直流電源装置と並列に接
続され前記電極と母材間に高電圧を印加する垂下特性型
の第２の直流電源装置とを備え、アーク起動時には前記
第２の直流電源装置から前記電極と母材間に高電圧を印
加し、アーク発生後は前記第２の直流電源装置からの高
電圧の印加を停止するようにしたものである。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a first method for supplying a direct current between an electrode and a base material.
And a second DC power supply of a drooping characteristic type connected in parallel with the first DC power supply and applying a high voltage between the electrode and the base material. A high voltage is applied between the electrode and the base material from the DC power supply device, and the application of the high voltage from the second DC power supply is stopped after an arc is generated.
【００１１】また、アーク起動時には前記第２の直流電
源装置から前記電極と母材間に直流高電圧を印加し、ア
ーク発生後は前記第１および第２の直流電源装置から給
電するようにしたものである。Further, at the time of starting the arc, a high DC voltage is applied between the electrode and the base material from the second DC power supply device, and after the arc is generated, power is supplied from the first and second DC power supply devices. Things.
【００１２】[0012]
【作用】上記構成において、アーク起動時に電極と母材
との間に第２の直流電源装置から高電圧を給電すること
により、電極と母材の間のエアギャップが絶縁破壊され
てコロナ放電し、アークがトリガされて非接触でアーク
起動される。In the above configuration, when a high voltage is supplied from the second DC power supply between the electrode and the base material at the time of starting the arc, the air gap between the electrode and the base material is broken down to cause corona discharge. , The arc is triggered and the arc is activated in a non-contact manner.
【００１３】[0013]
【実施例】以下、本発明の一実施例について図１から図
６を参照しながら説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.
【００１４】（実施例１）図１において、１は第１の直
流電源装置で、給電回路２ａ，２ｂを介して電極３と母
材４に直流電力を給電するものである。５は垂下特性型
の第２の直流電源装置で、第１の直流電源装置１の給電
回路２ａ，２ｂに接続され、電極３と母材４に４ＫＶ程
度の直流高電圧を印加するものである。６は一方向整流
素子で、その正極側を第１の直流電源装置１側にして第
１の直流電源装置１の正極側の給電回路２ｂに接続され
ている。そして、第２の直流電源装置５の正極側の給電
回路７が一方整流素子６の負極側に接続されて、第２の
直流電源装置５から給電される高電圧が第１の直流電源
装置１に印加されないようにしている。８はアーク発生
検出手段で、アーク発生による第１の直流電源装置１の
電流あるいは電圧を検出してスイッチ手段９に検出信号
を出力するものである。スイッチ手段９はアーク発生検
出手段８からの信号を入力して第２の直流電源装置５の
入力回路１０を遮断するものである。なお、１１は起動
信号器で、この操作により第１の直流電源装置１と第２
の直流電源装置５を起動するものである。(Embodiment 1) In FIG. 1, reference numeral 1 denotes a first DC power supply unit for supplying DC power to the electrodes 3 and the base material 4 via power supply circuits 2a and 2b. Reference numeral 5 denotes a second DC power supply of a drooping characteristic type, which is connected to the power supply circuits 2a and 2b of the first DC power supply 1 and applies a DC high voltage of about 4 KV to the electrode 3 and the base material 4. . Reference numeral 6 denotes a one-way rectifier element, the positive side of which is connected to the first DC power supply 1 side and connected to the power supply circuit 2b on the positive side of the first DC power supply 1. Then, the power supply circuit 7 on the positive side of the second DC power supply 5 is connected to the negative side of the rectifier 6, and the high voltage supplied from the second DC power supply 5 is applied to the first DC power supply 1. Is not applied to Numeral 8 denotes an arc detection means for detecting the current or voltage of the first DC power supply 1 due to the arc and outputting a detection signal to the switch means 9. The switch means 9 is for inputting a signal from the arc occurrence detecting means 8 to cut off the input circuit 10 of the second DC power supply 5. Reference numeral 11 denotes a start signal, and the first DC power supply 1 and the second DC
Is started.
【００１５】上記構成において、起動信号器１１を操作
すると、スイッチ手段９により直流電源装置５の入力回
路１０が閉じられて第１の直流電源装置１と第２の直流
電源装置５が起動し、第１の直流電源装置１からは定常
アークを形成する直流電力が、第２の直流電源装置から
はアーク起動のための、たとえば４ＫＶ程度の直流高電
圧が電極３と母材４の間に給電される。この給電によ
り、非接触により形成される電極３と母材４との間のエ
アギャップは直流高電圧によって絶縁破壊されてコロナ
放電し、アーク１２がトリガされる。In the above configuration, when the start signal 11 is operated, the input circuit 10 of the DC power supply 5 is closed by the switch means 9 and the first DC power supply 1 and the second DC power supply 5 are started up. DC power for forming a steady arc is supplied from the first DC power supply 1, and DC high voltage of, for example, about 4 KV is supplied between the electrode 3 and the base material 4 from the second DC power supply for starting the arc. Is done. By this power supply, the air gap between the electrode 3 and the base material 4 formed in a non-contact manner is broken down by a high DC voltage to cause corona discharge, and the arc 12 is triggered.
【００１６】この第２の直流電源装置５からの直流高電
圧の給電の時間は、図２に示したように、起動信号器１
１が操作されてスイッチ手段９により入力回路１０が閉
じられたときｔ1 からアーク発生検出手段８がアーク発
生を検出してその信号をスイッチ手段９に出力したとき
ｔ2 までの時間である。As shown in FIG. 2, the time of the supply of the DC high voltage from the second DC power supply 5
This is the time from t 1 when the switch 1 is operated and the input circuit 10 is closed by the switch means 9 to t 2 when the arc occurrence detection means 8 detects the arc occurrence and outputs a signal to the switch means 9.
【００１７】また、アーク起動からアーク移行後の動作
特性は、図３に示したように、無負荷時には第２の直流
電源装置５からの垂下特性を有する電力が、アーク移行
後には第１の直流電源装置１からの垂下特性または準定
電圧特性を有する電力が電極３と母材４との間に印加さ
れる。これにより電極３と母材４とが非接触状態である
非接触アーク起動をすることができる。なお、第１の直
流電源装置と第２の直流電源装置とを並列に設けている
ので、第２の直流電源装置が印加する直流高電圧が第１
の直流電源装置を介さずに電極と母材間に印加されるこ
ととなり、第１の直流電源装置の耐圧を強化する必要が
ない。 As shown in FIG. 3, the operating characteristic after the arc is switched from the arc starting is that the power having the drooping characteristic from the second DC power supply 5 when no load is applied, and the first characteristic after the arc is transferred. Power having a drooping characteristic or a quasi-constant voltage characteristic from the DC power supply 1 is applied between the electrode 3 and the base material 4. Thereby, non-contact arc starting in which the electrode 3 and the base material 4 are in a non-contact state can be performed. In addition, the first straight
Current power supply and the second DC power supply are provided in parallel.
Therefore, the high DC voltage applied by the second DC power supply
Applied between the electrode and the base material without passing through the DC power supply
It is necessary to increase the withstand voltage of the first DC power supply.
Absent.
【００１８】上記構成の本発明の溶接装置を次の条件で
実験した結果、ＥＭＣ試験法による雑音電界強度は、図
４に示したように従来例のものに対し約３０dBμＶ低下
した。また、アーク起動率は、図５に示したように従来
例のものに比べ著るしく向上した。特に、延長ケーブル
が長くなる程その差が顕著なものとなった。As a result of an experiment conducted on the welding apparatus of the present invention having the above-described configuration under the following conditions, the noise electric field intensity by the EMC test method was reduced by about 30 dBμV as compared with the conventional example as shown in FIG. Further, as shown in FIG. 5, the arc starting rate was remarkably improved as compared with the conventional example. In particular, the difference became remarkable as the extension cable became longer.
【００１９】実験条件 電極…トリウム入りタングステン ２.4mmφ Ａｒガス…５ｌ／min 電極・母材間距離…３mm 電流…５０Ａ トーチスイッチＯＮ／ＯＦＦ周期…２秒ＯＮ／１３秒Ｏ
ＦＦ 試験回路…１００回繰返し なお、この実施例１における溶接装置は溶接負荷を溶断
負荷にかえることによりプラズマ切断装置として使用で
きるものである。Experimental conditions Electrode: tungsten containing thorium 2.4 mmφ Ar gas: 5 l / min Distance between electrode and base material: 3 mm Current: 50 A Torch switch ON / OFF cycle: 2 seconds ON / 13 seconds O
FF test circuit: repeated 100 times The welding apparatus in the first embodiment can be used as a plasma cutting apparatus by changing a welding load to a fusing load.
【００２０】（実施例２） 第１の実施例においては、アーク発生検出手段８および
スイッチ手段９を用いてアーク発生後第２の直流電源装
置５からの給電を停止させるようにしたが、アーク発生
検出手段８およびスイッチ手段９を用いずに、図６に示
したようにアーク発生後も第１の直流電源装置１と第２
の直流電源装置５から給電するようにしてもよいもの
で、アーク切れ発生時の再起動が時間遅れなく瞬時に行
われるため、アークスタートミスがなくアークスタート
性能のより完璧化を図ることができる。なお、本実施例
２における構成は直流アーク溶接装置としてもプラズマ
切断装置としても使用できるものである。(Embodiment 2) In the first embodiment, the power supply from the second DC power supply 5 is stopped after the arc is generated using the arc generation detecting means 8 and the switch means 9. Without using the occurrence detecting means 8 and the switch means 9, the first DC power supply 1 and the second DC power
DC power supply device in which may be powered from 5 instantaneously row without delay restart time when arc interruption occurs in
Arc start without arc start mistake
More perfect performance can be achieved. The configuration according to the second embodiment can be used both as a DC arc welding apparatus and a plasma cutting apparatus.
【００２１】[0021]
【発明の効果】以上の実施例の説明から明らかなよう
に、本発明によれば、アーク起動時に電極と母材との間
に垂下特性を有する第２の直流電源装置から直流高電圧
を印加して電極と母材の間のエアギャップを絶縁破壊
し、コロナ放電させてアークをトリガするので、電極と
母材を非接触にしてアーク起動することができる。これ
によりアーク起動時の輻射ノイズをなくすることができ
る。また、アーク起動が直流高電圧で行われるので延長
ケーブルからのリークがなくなり、延長ケーブルを長く
しても確実に起動することができる。また、第１の直流
電源装置と第２の直流電源装置とを並列に設けているの
で、第２の直流電源装置が印加する直流高電圧が第１の
直流電源装置を介さずに電極と母材間に印加されること
となり、第１の電流電源装置の耐圧を強化する必要がな
い。このように本発明によれば、アーク起動時の輻射ノ
イズの発生がなく、かつ、延長ケーブルを長くしても確
実にアーク起動することができる直流アーク溶接装置お
よびプラズマ切断装置を提供することができる。As is apparent from the above description of the embodiment, according to the present invention, a high DC voltage is applied from the second DC power supply having a drooping characteristic between the electrode and the base material when starting the arc. As a result, the air gap between the electrode and the base material is broken down, and the arc is triggered by corona discharge, so that the electrode and the base material can be brought into non-contact to start the arc. Thereby, radiation noise at the time of starting the arc can be eliminated. In addition, since the arc is started at a high DC voltage, there is no leakage from the extension cable, and the start can be ensured even if the extension cable is lengthened. Also, the first DC
The power supply and the second DC power supply are provided in parallel.
And the high DC voltage applied by the second DC power supply
Be applied between the electrode and the base material without going through the DC power supply
It is not necessary to increase the withstand voltage of the first current power supply.
No. As described above, according to the present invention, it is possible to provide a DC arc welding apparatus and a plasma cutting apparatus that do not generate radiation noise at the time of starting an arc and that can reliably start an arc even when an extension cable is lengthened. it can.
【図１】本発明の直流アーク溶接装置およびプラズマ切
断装置の第１の実施例のブロック回路図FIG. 1 is a block circuit diagram of a first embodiment of a DC arc welding apparatus and a plasma cutting apparatus according to the present invention.
【図２】同直流高電圧の印加タイミング特性図FIG. 2 is a timing chart showing the application timing of the DC high voltage.
【図３】同第１の直流電源装置と第２の直流電源装置の
動作特性図FIG. 3 is an operational characteristic diagram of the first DC power supply and the second DC power supply.
【図４】同輻射雑音電界強度特性図FIG. 4 is a radiation noise electric field strength characteristic diagram of the same.
【図５】同アーク起動特性図FIG. 5 is an arc starting characteristic diagram
【図６】同第２の実施例の直流高電圧印加タイミング特
性図FIG. 6 is a characteristic diagram of a DC high voltage application timing according to the second embodiment.
【図７】従来例の交流アーク溶接電源のブロック回路図FIG. 7 is a block circuit diagram of a conventional AC arc welding power supply.
【図８】同高周波電圧の印加タイミング特性図FIG. 8 is an application timing characteristic diagram of the high-frequency voltage.
【図９】同輻射雑音電界強度特性図FIG. 9 is a radiated noise electric field intensity characteristic diagram.
【図１０】他の従来例の直流アーク溶接機の回路ブロッ
ク図FIG. 10 is a circuit block diagram of another conventional DC arc welding machine.
１ 第１の直流電源装置 ２ａ，２ｂ 給電回路 ３ 電極 ４ 母材 ５ 第２の直流電源装置 ６ 一方向整流素子 ８ アーク発生検出手段 ９ スイッチ手段 DESCRIPTION OF SYMBOLS 1 1st DC power supply 2a, 2b Power supply circuit 3 Electrode 4 Base material 5 2nd DC power supply 6 One-way rectifier 8 Arc generation detection means 9 Switch means
Claims (5)
１の直流電源装置と、前記第１の直流電源装置と並列に
接続され前記電極と母材の間に高電圧を印加する垂下特
性型の第２の直流電源装置とを備え、アーク起動時には
前記第２の直流電源装置から前記電極と母材間に高電圧
を印加し、アーク発生後は前記第２の直流電源装置から
の高電圧の印加を停止して前記第１の直流電源装置から
給電することを特徴とするアーク溶接装置。A first direct-current power supply for supplying a direct current between an electrode and a base material; and a high-current power supply connected in parallel with the first direct-current power supply between the electrode and the base material. A second DC power supply of a drooping characteristic type for applying a voltage, wherein a high voltage is applied between the electrode and the base material from the second DC power supply at the time of starting an arc, and the second voltage is applied after the arc is generated. An arc welding apparatus, wherein application of a high voltage from a DC power supply is stopped and power is supplied from the first DC power supply.
出するアーク発生検出手段と、前記アーク発生検出手段
からの信号により第２の直流電源装置の動作を停止させ
るスイッチ手段とを備えた請求項１記載の直流アーク溶
接装置。2. An apparatus according to claim 1, further comprising: an arc generation detecting means for detecting an arc generated by the first DC power supply, and a switch for stopping the operation of the second DC power supply in response to a signal from the arc generation detecting means. Item 6. A DC arc welding apparatus according to Item 1.
１の直流電源装置と、前記第１の直流電源装置と並列に
接続され前記電極と母材の間に高電圧を印加する垂下特
性型の第２の直流電源装置とを備え、アーク起動時には
前記第２の直流電源装置から前記電極と母材間に高電圧
を印加し、アーク発生後は前記第１および第２の直流電
源装置から給電することを特徴とする直流アーク溶接装
置。3. A first DC power supply for supplying a DC current between an electrode and a base material, and a high DC power supply connected in parallel with the first DC power supply between the electrode and the base material. A second DC power supply of a drooping characteristic type for applying a voltage, wherein a high voltage is applied between the electrode and the base material from the second DC power supply at the time of starting an arc, and the first and second power supplies are generated after the arc is generated. A DC arc welding apparatus, wherein power is supplied from a second DC power supply.
前記第１の直流電源側にして一方向整流素子を接続し、
前記一方向性整流子の負極側に第２の直流電源装置の給
電回路を接続したことを特徴とする請求項１または３項
記載のアーク溶接装置。4. A one-way rectifying element is connected to a power supply circuit of a first DC power supply device, with a positive electrode side being the first DC power supply side,
The arc welding apparatus according to claim 1, wherein a power supply circuit of a second DC power supply is connected to a negative electrode side of the one-way commutator.
アーク溶接装置を母材の切断に使用したプラズマ切断装
置。5. A plasma cutting apparatus using the DC arc welding apparatus according to claim 1 for cutting a base material.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22541892A JP2631178B2 (en) | 1992-08-25 | 1992-08-25 | DC arc welding equipment and plasma cutting equipment |
| DE69317961T DE69317961T2 (en) | 1992-08-25 | 1993-08-20 | Arc welding and plasma cutting machine |
| EP93306602A EP0585068B1 (en) | 1992-08-25 | 1993-08-20 | Arc welding machine and plasma cutting machine |
| CN93116583A CN1040301C (en) | 1992-08-25 | 1993-08-25 | Arc welding machine and plasma cutting machine |
| US08/391,095 US5582751A (en) | 1992-08-25 | 1995-02-21 | Arc welding machine and plasma cutting machine |
| US08/631,087 US5773792A (en) | 1992-08-25 | 1996-04-12 | ARC welding machine and plasma cutting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22541892A JP2631178B2 (en) | 1992-08-25 | 1992-08-25 | DC arc welding equipment and plasma cutting equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0663745A JPH0663745A (en) | 1994-03-08 |
| JP2631178B2 true JP2631178B2 (en) | 1997-07-16 |
Family
ID=16829065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22541892A Expired - Fee Related JP2631178B2 (en) | 1992-08-25 | 1992-08-25 | DC arc welding equipment and plasma cutting equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2631178B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5852278A (en) * | 1995-12-28 | 1998-12-22 | Matsushita Electric Industrial Co., Ltd. | Arc welding and arc plasma cutting machines having improved DC high-voltage generator |
| CN103350273A (en) * | 2013-06-18 | 2013-10-16 | 嘉兴力德数控科技有限公司 | Arc strike starting circuit of plasma cutting machine |
-
1992
- 1992-08-25 JP JP22541892A patent/JP2631178B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0663745A (en) | 1994-03-08 |
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