JP3215622B2 - Arc welding power supply - Google Patents
Arc welding power supplyInfo
- Publication number
- JP3215622B2 JP3215622B2 JP08682996A JP8682996A JP3215622B2 JP 3215622 B2 JP3215622 B2 JP 3215622B2 JP 08682996 A JP08682996 A JP 08682996A JP 8682996 A JP8682996 A JP 8682996A JP 3215622 B2 JP3215622 B2 JP 3215622B2
- Authority
- JP
- Japan
- Prior art keywords
- change rate
- voltage
- current change
- output
- current
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Fee Related
Links
Landscapes
- Arc Welding Control (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、消耗電極を用いて
薄板を高速溶接するのに好適なア−ク溶接電源に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arc welding power source suitable for high-speed welding of a thin plate using a consumable electrode.
【０００２】[0002]
【従来の技術】図３は従来の消耗電極を用いるア−ク溶
接電源の接続図で、特公平４−５３６１９号公報に開示
されたものを簡略化して示すものである。１はア−ク溶
接電源で、商用交流電源２からの入力を入力側整流回路
３で直流に変換し、平滑用コンデンサ４により平滑化し
た後、インバ−タ回路５により高周波交流（例えば２０
ｋＨｚ）に変換し、これを変圧器６で溶接に適した電圧
に降圧した後、出力側整流回路７により再度直流に変換
し、直流リアクタ８により平滑化してア−ク負荷１２に
直流出力を供給する。１０は消耗電極である溶接ワイ
ヤ、１１はワイヤ送給モ−タ、１３は母材である。そし
て、電流変化率検出手段として直流リアクタ８に二次巻
線８ａを設け、この二次巻線８ａに誘起する電圧をア−
ク負荷１２に供給される出力電流Ｉの変化率（ｄｉ／ｄ
ｔ）に対応した信号として用いる。なお、上記電圧には
インバ−タの成分が含まれるため、フィルタ回路１５を
通し、電流変化率制御回路１６により反転増幅して帰還
信号とする。そして、上記帰還信号と出力電圧設定器１
７からの基準入力信号とを加算器１８で加算した信号を
前記インバ−タ回路５の出力パルス幅を決定する制御入
力とすることにより、電流変化を抑制する。なお、出力
電流Ｉに関するフィルタ回路１５、電流変化率制御回路
１６、出力電圧設定器１７、加算器１８の信号は、図４
のＡ〜Ｄに示すようになっている。そして、特公平４−
５３６１９号では、長時間の短絡状態および長時間のア
ーク状態が続いたときには出力電流の変化に対する抑制
を強めることにより、スパッタの低減およびアーク切れ
防止を簡単な構成で実現している。2. Description of the Prior Art FIG. 3 is a connection diagram of an arc welding power source using a conventional consumable electrode, which is simplified from that disclosed in Japanese Patent Publication No. 4-53619. An arc welding power source 1 converts an input from a commercial AC power source 2 into a direct current by an input side rectifier circuit 3, smoothes it with a smoothing capacitor 4, and then a high frequency alternating current (for example, 20) by an inverter circuit 5.
kHz), which is stepped down to a voltage suitable for welding by the transformer 6, converted again to DC by the output-side rectifier circuit 7, smoothed by the DC reactor 8, and the DC output is supplied to the arc load 12. Supply. 10 is a welding wire as a consumable electrode, 11 is a wire feed motor, and 13 is a base material. A secondary winding 8a is provided in the DC reactor 8 as current change rate detecting means, and a voltage induced in the secondary winding 8a is applied to an arc.
Of the output current I supplied to the load 12 (di / d
Used as a signal corresponding to t). Since the voltage contains an inverter component, the voltage passes through the filter circuit 15 and is inverted and amplified by the current change rate control circuit 16 to be a feedback signal. Then, the feedback signal and the output voltage setting device 1
The change in the current is suppressed by using the signal obtained by adding the reference input signal from the inverter 7 and the adder 18 as a control input for determining the output pulse width of the inverter circuit 5. Note that signals of the filter circuit 15, the current change rate control circuit 16, the output voltage setter 17, and the adder 18 relating to the output current I are shown in FIG.
A to D of FIG. And Tokuhei 4-
No. 53619 realizes reduction of spatter and prevention of arc break by a simple configuration by strengthening suppression of a change in output current when a long-term short-circuit state and a long-time arc state continue.
【０００３】[0003]
【発明が解決しようとする課題】消耗電極を用いて薄板
を高速溶接する場合、短絡を規則正しく発生させる必要
がある。しかし、上記従来技術において、短絡時および
ア−ク時の電流変化率を小さくすると、図５（ａ）の溶
接電流波形に示すように、ａの区間で示す短絡時間とｂ
の区間で示すア−ク発生時間が長くなり、短絡回数が大
幅に減少してビ−ド外観が悪くなる。また、ア−ク長が
急激に短くなったときに短絡が開放されず、ｃの区間で
示す長い短絡が生じ、その間に過熱された溶接ワイヤが
爆発的に溶断してア−ク切れを起こし、溶接速度を上げ
ることができない。一方、短絡回数を多くするために短
絡時およびア−ク時の電流変化率を大きくすると、図５
（ｂ）の溶接電流波形に示すように、短絡回数は増加す
る。しかし、ｄの区間で示すような非常に短い時間の短
絡（以下、不完全短絡と称す。なお、不完全短絡は、短
絡初期の急激な電流の立上りによる電磁ピンチ力により
溶滴が母材に移行する前に短絡が開放することにより発
生する。）が頻発するようになる。そして、この間は溶
接ワイヤ先端の溶滴が母材にほとんど移行せず、短絡回
数が減少したのと同じ結果になって溶滴が大きく成長す
る。そして、ｅの区間で示す次の短絡時に大きな短絡電
流が流れ、大粒のスッパタが発生したり、ア−ク切れに
なることがある。本発明の目的は、上記した課題を解決
し、短絡回数を多くしたときの不完全短絡の発生を防止
して、高速で溶接を行っても短絡が規則正しく発生し、
ア−クを安定にすることができるア−ク溶接電源を提供
するにある。When a thin plate is welded at a high speed using a consumable electrode, it is necessary to generate short circuits regularly. However, in the above-mentioned prior art, when the current change rates at the time of short-circuit and at the time of arc are reduced, as shown in the welding current waveform of FIG.
The arc generation time indicated by the section (1) becomes longer, the number of short circuits is greatly reduced, and the bead appearance deteriorates. In addition, when the arc length is sharply shortened, the short circuit is not released, and a long short circuit shown in the section c occurs, and during this time, the overheated welding wire explosively melts and the arc breaks. , Cannot increase the welding speed. On the other hand, if the current change rate at the time of short circuit and at the time of arc is increased in order to increase the number of short circuits,
As shown in the welding current waveform of (b), the number of short circuits increases. However, a short circuit for a very short time as shown in the section d (hereinafter referred to as an incomplete short circuit. In the incomplete short circuit, a droplet is formed on a base material by an electromagnetic pinch force due to a sudden rise of current at the beginning of a short circuit. This occurs when the short circuit is released before the transition.). During this time, the droplet at the tip of the welding wire hardly migrates to the base material, and the droplet has a large growth with the same result as the decrease in the number of short circuits. Then, at the time of the next short circuit shown in the section e, a large short-circuit current flows, and large spatter may be generated or the arc may be cut. The object of the present invention is to solve the above-described problems, to prevent the occurrence of incomplete short circuit when the number of short circuits is increased, short circuits occur regularly even when welding at high speed,
An object of the present invention is to provide an arc welding power source capable of stabilizing an arc.
【０００４】[0004]
【課題を解決するための手段】本発明者は、電源変化率
制御回路１６の出力が、図２のＣに示すように、短絡か
らア−クに移行した点が、＋の最大となり、ア−クから
短絡に移行した点が、−の最大となることに注目した。
この結果、上記した課題は、出力電流の変化率を検出す
る出力電流変化率検出手段と、前記出力電流変化率の検
出信号を出力制御部に入力することにより出力電流の変
化率を制御する電流変化率制御回路とを備え、消耗性電
極と母材との間にア−クを発生させる定電圧特性のア−
ク溶接電源において、前記電流変化率制御回路の出力電
圧のうち電流変化率を正にする電圧を検出し、検出した
電圧が所定の値以上の場合は前記電流変化率制御回路の
増幅率を所定の時間だけ低下させる回路と、前記電流変
化率制御回路の出力電圧のうち電流変化率を負にする電
圧を検出し、検出した電圧が所定の値以上の場合は所定
の遅延時間の後に所定の時間だけ前記電流変化率制御回
路の増幅率を低下させる回路とを備えることにより解決
される。そして、電源変化率制御回路を反転増幅器と
し、前記反転増幅器の入出力間にコンデンサと抵抗を直
列に接続し、上記抵抗と並列に電源変化率を正にする電
圧が発生した時順方向となるダイオ−ドを複数個直列に
接続したものを接続し、上記抵抗と並列に電源変化率を
負にする電圧が発生した時順方向となるダイオ−ドを複
数個直列に接続したものとスイッチング素子を直列に接
続し、前記負にする電圧により前記スイッチング素子を
ＯＮディレ−するように構成することにより実現でき
る。The inventor of the present invention has found that the point at which the output of the power supply change rate control circuit 16 shifts from a short circuit to an arc as shown in FIG. It was noticed that the point at which the transition from -k to the short circuit became the maximum of-.
As a result, the above-described problem is solved by an output current change rate detecting means for detecting a change rate of the output current, and a current for controlling the change rate of the output current by inputting a detection signal of the output current change rate to an output control unit. A constant rate characteristic arc that generates an arc between the consumable electrode and the base material.
In the welding power supply, a voltage that makes the current change rate positive among the output voltages of the current change rate control circuit is detected, and when the detected voltage is equal to or more than a predetermined value, the amplification rate of the current change rate control circuit is set to a predetermined value. And a voltage that reduces the current change rate among the output voltages of the current change rate control circuit, and when the detected voltage is equal to or more than a predetermined value, the voltage is reduced after a predetermined delay time. A circuit for lowering the amplification factor of the current change rate control circuit by time. The power supply change rate control circuit is an inverting amplifier. A capacitor and a resistor are connected in series between the input and output of the inverting amplifier. When a voltage that makes the power supply change rate positive is generated in parallel with the resistor, the forward direction occurs. A diode in which a plurality of diodes connected in series are connected, and a diode in which a plurality of diodes are connected in series in a forward direction when a voltage that makes the power supply change rate negative is generated in parallel with the resistor, and a switching element. Are connected in series, and the switching element is ON-delayed by the negative voltage.
【０００５】[0005]
【発明の実施の形態】図１は本発明の実施の形態を示す
ものである。なお、図３と同じものは同一の符号を付
し、説明を省略する。２０はコンデンサで、一方は電流
変化率制御回路１６の入力端Ａに、他方は接続点Ｓに接
続してある。２１は放電用抵抗で、一方は電流変化率制
御回路１６の出力端Ｋに、他方は接続点Ｓに接続してあ
る。２２〜２５はダイオ−ドで、それぞれ直列に接続し
てあり、ダイオ−ド２２のアノードが出力端Ｋに、ダイ
オ−ド２５のカソードが入力端Ａに接続してある。２６
〜３０はダイオ−ドで、それぞれ直列に接続してあり、
ダイオ−ド３０のアノードが接続点Ｓに、ダイオ−ド２
６のカソードがトランジスタ３１のコレクタＣに接続し
てある。３１はトランジスタで、コレクタＣはダイオ−
ド２６のカソードに、エミッタＥは出力端Ｋに、ベース
Ｂはダイオ−ド３３のカソードに接続してある。３２は
抵抗で、一方は入力端Ａに、他方は他方は接続点Ｔに接
続してある。３３はダイオ−ドで、アノードが接続点Ｔ
に、カソードがトランジスタ３１のベースＢに接続して
ある。３４はコンデンサで、一方は接続点Ｔに、他方は
出力端Ｋに接続してある。３５はダイオ−ドで、アノー
ドが出力端Ｋに、カソードが接続点Ｔに接続してある。FIG. 1 shows an embodiment of the present invention. Note that the same components as those in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted. Reference numeral 20 denotes a capacitor, one of which is connected to the input terminal A of the current change rate control circuit 16 and the other of which is connected to the connection point S. 21 is a discharging resistor, one of which is connected to the output terminal K of the current change rate control circuit 16 and the other is connected to the connection point S. Diodes 22 to 25 are connected in series. The anode of the diode 22 is connected to the output terminal K, and the cathode of the diode 25 is connected to the input terminal A. 26
-30 are diodes connected in series,
The anode of the diode 30 is connected to the connection point S, and the diode 2
6 is connected to the collector C of the transistor 31. 31 is a transistor, and collector C is a diode.
The emitter E is connected to the output terminal K, and the base B is connected to the cathode of the diode 33. 32 is a resistor, one of which is connected to the input terminal A and the other of which is connected to the connection point T. 33 is a diode whose anode is connected to the connection point T.
The cathode is connected to the base B of the transistor 31. 34 is a capacitor, one of which is connected to the connection point T and the other of which is connected to the output terminal K. Reference numeral 35 denotes a diode having an anode connected to the output terminal K and a cathode connected to the connection point T.
【０００６】以下、図４に対応する図２を参照しながら
動作を説明する。なお、同図において点線で示すものは
図４に示したものである。負荷が短絡からア−クになっ
た直後（電流変化率が正の時）は電流変化率制御回路１
６の入出力間電圧は、図２のｆ点となり、ダイオ−ド２
２，２３，２４，２５の順方向電圧より高いため、出力
端Ｋからコンデンサ２０を通る電流が流れ、電流変化率
制御回路１６の増幅率を減少させるから、出力電流は急
激に低下する。この結果、ア−クの燃え上がりを防止し
て短絡を促進させる。なお、出力電流が急激に低下する
時間ｔ1はコンデンサ２０の充電時間で決定される。負
荷がア−クから短絡になった直後（電源変化率が負の
時）は電流変化率制御回路１６の入出力間電圧は、図２
のｇ点となり、ダイオ−ド２６，２７，２８，２９，３
０の順方向電圧より高いため、入力端Ａからトランジス
タ３１のＯＮディレ−時間ｔ2後のｈ点から、コンデン
サ２０を通る電流が流れ、この電流は電流変化率制御回
路１６の増幅率を減少させるから、出力電流を急激に所
定の時間だけ急激に増加する。この結果、ｇ点での急激
な電流増加を防ぐことで不完全短絡を防止し、かつｈ点
からの電流の急激な電流増加により短絡からの開放の安
定化を計ることができ、短絡回数が多く、不完全短絡の
少ない溶接を行うことができる。なお、出力電流が急激
に増加する時間ｔ3はコンデンサ２０の充電時間で決定
される。なお、ダイオ−ド３３はトランジスタ３１がＯ
Ｎするしきい値を決めるためのものであり、ダイオ−ド
３５はコンデンサ３３が逆方向には充電されないように
してＯＮディレ−時間を一定にするためのものである。
なお、電源変化率制御回路１６は反転増幅器としてもよ
い。また、ダイオ−ドを複数個直列に接続することによ
り所定の電圧を作ったが、他の手段を用いても良い。Hereinafter, the operation will be described with reference to FIG. 2 corresponding to FIG. It should be noted that those shown by dotted lines in FIG. 4 are those shown in FIG. Immediately after the load becomes an arc from a short circuit (when the current change rate is positive), the current change rate control circuit 1
The voltage between the input and the output of node 6 becomes the point f in FIG.
Since the forward voltage is higher than 2, 23, 24, and 25, a current flows from the output terminal K through the capacitor 20, and the amplification factor of the current change rate control circuit 16 is reduced, so that the output current sharply decreases. As a result, the burning of the arc is prevented and the short circuit is promoted. Note that the time t 1 at which the output current sharply decreases is determined by the charging time of the capacitor 20. Immediately after the load is short-circuited from the arc (when the power supply change rate is negative), the voltage between the input and output of the current change rate control circuit 16 is as shown in FIG.
G point of diode 26,27,28,29,3
0 higher than the forward voltage of, ON transistor 31 from the input terminal A directory - from h point after time t 2, the current flows through the capacitor 20, this current reduces the gain of the current change rate control circuit 16 Therefore, the output current sharply increases for a predetermined time. As a result, an incomplete short circuit can be prevented by preventing a sudden increase in the current at point g, and the opening from the short circuit can be stabilized by a sudden increase in the current from point h. Many weldings with few incomplete short circuits can be performed. The time t 3 at which the output current rapidly increases is determined by the charging time of the capacitor 20. Note that the diode 33 has the transistor 31
The diode 35 is for determining the threshold value for N, and the diode 35 is for keeping the ON delay time constant by preventing the capacitor 33 from being charged in the reverse direction.
The power supply change rate control circuit 16 may be an inverting amplifier. Further, although a predetermined voltage is generated by connecting a plurality of diodes in series, other means may be used.
【０００７】[0007]
【発明の効果】以上説明したように、本発明によれば、
負荷が短絡からア−クになった直後（電源変化率が正の
時）は所定の時間だけ溶接電源出力電流を急激に低下さ
せ、ア−クの燃え上がりを防止して短絡を促進させ、負
荷がア−クから短絡になった直後（電源変化率が負の
時）は急激な電流増加を防ぐことで不完全短絡を防止
し、所定の時間の後に所定の時間だけ急激に増加させる
ようにしたから、短絡からの開放の安定化を計ることが
でき、短絡が規則正しい溶接を行うことができる。この
結果、短絡回数が多く、かつ規則正しくなり、不完全短
絡の少ない溶接を行うことができ、大粒のスパッタの発
生を防止できる。また、低いア−ク電圧でも安定したア
−ク状態が得られ、溶接速度を向上させることができ
る。さらに、溶滴の過大な成長が抑制され、作業性が向
上し均一なビ−ド外観が得られる。という効果がある。As described above, according to the present invention,
Immediately after the load becomes an arc from a short circuit (when the rate of change of the power supply is positive), the output current of the welding power supply is sharply reduced for a predetermined time to prevent the arc from burning and promote the short circuit. Immediately after a short circuit from an arc (when the power supply change rate is negative), a sudden increase in current is prevented to prevent an incomplete short circuit, and after a predetermined time, the current is rapidly increased for a predetermined time. Therefore, the release from the short circuit can be stabilized, and the short circuit can perform regular welding. As a result, the number of short-circuits is large, the welding is regular, the welding with few incomplete short-circuits can be performed, and the generation of large spatters can be prevented. Further, a stable arc state can be obtained even at a low arc voltage, and the welding speed can be improved. Further, excessive growth of droplets is suppressed, workability is improved, and a uniform bead appearance is obtained. This has the effect.
【図１】本発明の実施の形態を示す図。FIG. 1 is a diagram showing an embodiment of the present invention.
【図２】本発明における各部の波形図。FIG. 2 is a waveform chart of each part in the present invention.
【図３】従来の接続図。FIG. 3 is a conventional connection diagram.
【図４】従来の各部の波形図。FIG. 4 is a waveform diagram of each part of the related art.
【図５】従来の溶接波形図。FIG. 5 is a conventional welding waveform diagram.
８ａ 二次巻線 １１ 母材 １３ 溶接ワイヤ １６ 電流変化率制御回路 ２０，３４ コンデンサ ２１ 放電用抵抗 ２２〜３０，３３，３５ ダイオ−ド ３１ トランジスタ３１ ３２ 抵抗 8a Secondary winding 11 Base material 13 Welding wire 16 Current change rate control circuit 20, 34 Capacitor 21 Discharge resistance 22 to 30, 33, 35 Diode 31 Transistor 31 32 Resistance
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) B23K 9/073 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 7 , DB name) B23K 9/073
Claims (2)
率検出手段と、前記出力電流変化率の検出信号を出力制
御部に入力することにより出力電流の変化率を制御する
電流変化率制御回路とを備え、消耗性電極と母材との間
にア−クを発生させる定電圧特性のア−ク溶接電源にお
いて、前記電流変化率制御回路の出力電圧のうち電流変
化率を正にする電圧を検出し、検出した電圧が所定の値
以上の場合は前記電流変化率制御回路の増幅率を所定の
時間だけ低下させる回路と、前記電流変化率制御回路の
出力電圧のうち電流変化率を負にする電圧を検出し、検
出した電圧が所定の値以上の場合は所定の遅延時間の後
に所定の時間だけ前記電流変化率制御回路の増幅率を低
下させる回路とを備えることを特長とするア−ク溶接電
源。1. An output current change rate detecting means for detecting a change rate of an output current, and a current change rate control for controlling a change rate of an output current by inputting a detection signal of the output current change rate to an output control section. A constant voltage characteristic arc welding power source for generating an arc between the consumable electrode and the base material, wherein the current change rate of the output voltage of the current change rate control circuit is made positive. Detecting a voltage, and when the detected voltage is equal to or more than a predetermined value, a circuit for reducing the amplification factor of the current change rate control circuit for a predetermined time; and a current change rate among output voltages of the current change rate control circuit. A circuit for detecting a voltage to be made negative and, when the detected voltage is equal to or more than a predetermined value, reducing a gain of the current change rate control circuit for a predetermined time after a predetermined delay time. Arc welding power supply.
記反転増幅器の入出力間にコンデンサと抵抗を直列に接
続し、上記抵抗と並列に電源変化率を正にする電圧が発
生した時順方向となるダイオ−ドを複数個直列に接続し
たものを接続し、上記抵抗と並列に電源変化率を負にす
る電圧が発生した時順方向となるダイオ−ドを複数個直
列に接続したものとスイッチング素子を直列に接続し、
前記負にする電圧により前記スイッチング素子をＯＮデ
ィレ−するように構成したことことを特長とする請求項
１に記載のア−ク溶接電源。2. A current change rate control circuit comprising an inverting amplifier, a capacitor and a resistor connected in series between the input and output of the inverting amplifier, and a sequence in which a voltage for making the power supply change rate positive occurs in parallel with the resistor. A plurality of diodes connected in series are connected in series, and a plurality of diodes connected in a forward direction when a voltage that makes the power supply change rate negative is generated in parallel with the resistor. And a switching element in series,
2. The arc welding power source according to claim 1, wherein said switching element is turned on by said negative voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08682996A JP3215622B2 (en) | 1996-04-09 | 1996-04-09 | Arc welding power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08682996A JP3215622B2 (en) | 1996-04-09 | 1996-04-09 | Arc welding power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09271941A JPH09271941A (en) | 1997-10-21 |
| JP3215622B2 true JP3215622B2 (en) | 2001-10-09 |
Family
ID=13897712
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08682996A Expired - Fee Related JP3215622B2 (en) | 1996-04-09 | 1996-04-09 | Arc welding power supply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3215622B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT508146B1 (en) * | 2009-08-10 | 2010-11-15 | Fronius Int Gmbh | METHOD FOR DISCONNECTING A SHORT CIRCUIT FOR SHORT ARC WELDING AND WELDING DEVICE FOR SHORT ARC WELDING |
-
1996
- 1996-04-09 JP JP08682996A patent/JP3215622B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09271941A (en) | 1997-10-21 |
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