JPS645995B2 - - Google Patents
Info
- Publication number
- JPS645995B2 JPS645995B2 JP12976880A JP12976880A JPS645995B2 JP S645995 B2 JPS645995 B2 JP S645995B2 JP 12976880 A JP12976880 A JP 12976880A JP 12976880 A JP12976880 A JP 12976880A JP S645995 B2 JPS645995 B2 JP S645995B2
- Authority
- JP
- Japan
- Prior art keywords
- welding
- arc
- current
- time constant
- control device
- 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
Links
- 238000003466 welding Methods 0.000 claims description 53
- 239000003990 capacitor Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000005493 welding type Methods 0.000 description 1
Landscapes
- Arc Welding Control (AREA)
Description
【発明の詳細な説明】
本発明は定電流フイードバツク制御を用いた
TIGアーク溶接機において、アークスタート電流
をゆるやかに上昇させる溶接制御装置に関するも
のである。[Detailed Description of the Invention] The present invention uses constant current feedback control.
This relates to a welding control device that gradually increases the arc start current in a TIG arc welder.
従来、この種の溶接制御装置は第１図に示すよ
うに、基準信号発生器１と誤差増幅器２と位相制
御器５とからなり、基準電圧VBと溶接アークか
ら検出した溶接電流との差をある時定数を有する
誤差増幅器２の入力とし、この誤差増幅器２の出
力Voで位相制御回路５を介して出力制御のサイ
リスタ７を駆動するように構成されている。なお
第１図においては、３は抵抗、４はコンデンサ、
６は溶接電流検出器である。 Conventionally, this type of welding control device consists of a reference signal generator 1, an error amplifier 2, and a phase controller 5, as shown in FIG . is input to an error amplifier 2 having a certain time constant, and the output Vo of the error amplifier 2 is configured to drive a thyristor 7 for output control via a phase control circuit 5. In Fig. 1, 3 is a resistor, 4 is a capacitor,
6 is a welding current detector.
しかしながら、このような制御装置では、アー
ク起動を行う溶接開始時の溶接電流がＯであるた
めに、誤差増幅器２の出力Voは第２図の実線で
示すように瞬時に立上がり定常値をはるかに越え
る。これは定常溶接時の時定数が外乱に対する速
応性を十分満足させるために比較的短い定数にし
ているため、過大な電流立上りとなるのである。
通常、溶接開始時の電流立上りをアークスタート
特性を損わない程度にゆるやかにするには、時定
数を定常溶接時の定数の２〜４倍にする必要があ
る。しかしながら、定常溶接時の定数を２〜４倍
の状態にすると、外乱に対する速応性が悪くな
り、溶接に必要な定電流性能を十分満足すること
ができなくなる。すなわち、従来の制御装置のよ
うに一つの時定数ではアーク起動を行う溶接開始
時に必要な条件と、定常溶接時に必要な条件をと
もに満足させることはできないのである。 However, in such a control device, since the welding current at the start of welding that starts the arc is O, the output Vo of the error amplifier 2 rises instantaneously as shown by the solid line in Fig. 2, far exceeding the steady value. exceed. This is because the time constant during steady welding is set to a relatively short constant in order to sufficiently satisfy rapid response to disturbances, resulting in an excessive current rise.
Normally, in order to make the current rise at the start of welding gradual enough not to impair arc start characteristics, the time constant needs to be 2 to 4 times the constant during steady welding. However, if the constant during steady welding is increased by 2 to 4 times, the rapid response to disturbances will deteriorate, making it impossible to fully satisfy the constant current performance required for welding. That is, unlike conventional control devices, it is not possible to satisfy both the conditions required at the start of welding to start the arc and the conditions required during steady welding with a single time constant.
従来、この時定数は定常溶接時に必要な条件を
満足させるため、定常溶接時の時定数に合せてい
た。そのため、溶接開始時の溶接電流が定常溶接
時の電流よりも過大となるのを避けられない。そ
の結果、薄板溶接の場合には、アーク起動時の過
大電流により穴があいたり、タングステン電極の
消耗が激しくなつたりする欠点があつた。 Conventionally, this time constant has been matched to the time constant during steady welding in order to satisfy the conditions necessary during steady welding. Therefore, it is inevitable that the welding current at the start of welding becomes larger than the current during steady welding. As a result, in the case of thin plate welding, there were drawbacks such as holes being formed due to excessive current at the time of starting the arc, and tungsten electrodes being severely worn out.
本発明はこのような従来の欠点を除去し、アー
ク起動を行う溶接開始時に安定した溶接条件が得
られるようにした溶接制御装置を提供するもので
ある。以下、本発明について、第３図および第４
図の図面を用いて説明する。 The present invention eliminates these conventional drawbacks and provides a welding control device that allows stable welding conditions to be obtained at the start of welding with arc activation. The present invention will be described below with reference to FIGS. 3 and 4.
This will be explained using the drawings of the figures.
第３図に本発明の一実施例による溶接制御装置
を示しており、第１図と同一箇所については同一
番号を付している。図において１は溶接電流値を
設定する基準信号発生器で、の基準電圧を発生
する。２は溶接電流検出器６から信号として検
出されたVSと前述の基準電圧VBを比較し、VS−
VBの差電圧を反転増幅する誤作増幅器、３，４
は誤作増幅器２の時定数を決定する抵抗器とコン
デンサーであり、定常溶接時の時定数はR1×C1
で決まり制御系が外乱に対して溶接電流を高精度
に制御する値となつている。５は誤差増幅器２の
出力Voを受け、サイリスタ７を駆動する位相制
御回路、８は時定数切換用のリレーで、このリレ
ー８の動作は第４図ａ，ｂに示すように溶接電流
が流れて約100ｍsec後にONするように制御され
ている。したがつて、溶接開始後、100ｍsecの非
常に短い時間以外は制御系は最適制御系となつて
おり、定常溶接に必要とされる定電流性能は十分
満足できる。８ａはリレー８の接点である。９は
溶接開始時の制御系を過制動状態にするためのコ
ンデンサで、この容量はコンデンサ４の容量の２
〜４倍である。 FIG. 3 shows a welding control device according to an embodiment of the present invention, and the same parts as in FIG. 1 are given the same numbers. In the figure, 1 is a reference signal generator for setting a welding current value, which generates a reference voltage. 2 compares V S detected as a signal from the welding current detector 6 with the reference voltage V B mentioned above, and calculates V S −
Erroneous amplifier that inverts and amplifies the voltage difference between V B , 3, 4
are the resistor and capacitor that determine the time constant of the malfunctioning amplifier 2, and the time constant during steady welding is R 1 × C 1
The value is determined by the value that allows the control system to control the welding current with high precision against disturbances. 5 is a phase control circuit that receives the output Vo of the error amplifier 2 and drives the thyristor 7; 8 is a time constant switching relay; the operation of this relay 8 is as shown in Fig. 4 a and b, when the welding current flows. It is controlled so that it turns on approximately 100msec later. Therefore, the control system is an optimal control system except for a very short time of 100 msec after welding starts, and the constant current performance required for steady welding is fully satisfied. 8a is a contact point of the relay 8. 9 is a capacitor for putting the control system into an overbraking state at the start of welding, and this capacitance is 2 of the capacitance of capacitor 4.
~4 times.
すなわち、アーク起動を行う溶接開始時の出力
信号Voは溶接電流フイードバツク信号がＯであ
るので、基準信号VBに対するステツプ応答と同
様に考えられる。 That is, since the welding current feedback signal is O, the output signal Vo at the start of welding for arc starting can be considered in the same way as a step response to the reference signal VB .
ここで、第３図においては、スタート時の誤差
増幅器２の時定数をリレー８により切り換えるよ
うにし、溶接開始時のある時間は過制動になるよ
うに定常溶接時の時定数の２〜４倍の時定数を設
定しているため、第２図の波線に示すように、ゆ
るやかに起動電流を立上らせることができる。す
なわち、溶接開始時はコンデンサ４，９、抵抗３
による（C1＋C2）×R1の時定数で過制動の条件に
し、定常の溶接時には外乱に対してすみやかに電
流を一定に保持する時定数R1×C1となるように
誤差増幅器２を構成している。したがつて、定常
時の溶接に必要な定電流精度を損うことなく、溶
接開始時のアーク起動電流の立上がりをゆるやか
に上昇させることができる。 Here, in Fig. 3, the time constant of the error amplifier 2 at the start is switched by the relay 8, and the time constant is 2 to 4 times the time constant during steady welding so that over-braking occurs for a certain time at the start of welding. Since the time constant is set, the starting current can be gradually raised as shown by the broken line in FIG. In other words, at the start of welding, capacitors 4 and 9, resistor 3
The error amplifier 2 is set so that the time constant of (C 1 + C 2 ) × R 1 is set as the overbraking condition, and the time constant R 1 × C 1 is set so that the current is quickly held constant against disturbance during steady welding. It consists of Therefore, the rise of the arc starting current at the start of welding can be gradually increased without impairing the constant current accuracy required for steady state welding.
以上のように本発明によれば、溶接開始時の過
大なアーク起動電流を抑制することができ、良好
な溶接開始時の溶接結果が得られ、しかも定常溶
接時に必要とされる定電流性能を十分に満足する
ことができるのである。 As described above, according to the present invention, an excessive arc starting current at the start of welding can be suppressed, a good welding result at the start of welding can be obtained, and the constant current performance required during steady welding can be achieved. You can be fully satisfied.
第１図は従来の溶接制御装置を示すブロツク回
路図、第２図は従来の溶接制御装置を用いた場合
の溶接開始アーク起動電流波形と、本発明の溶接
制御装置を用いた場合の溶接開始時のアーク起動
電流波形を示す図、第３図は本発明の一実施例に
よる溶接制御装置を示すブロツク回路図、第４図
はそのブロツク回路における要部の動作を示すタ
イミングチヤートである。
１……基準信号発生器、２……誤差増幅器、３
……抵抗、４，９……コンデンサ、５……位相制
御回路、６……溶接電流検出器、７……サイリス
タ、８……リレー。
Fig. 1 is a block circuit diagram showing a conventional welding control device, and Fig. 2 shows welding start arc starting current waveforms when using the conventional welding control device and welding start when using the welding control device of the present invention. FIG. 3 is a block circuit diagram showing a welding control device according to an embodiment of the present invention, and FIG. 4 is a timing chart showing the operation of essential parts of the block circuit. 1...Reference signal generator, 2...Error amplifier, 3
...Resistor, 4,9...Capacitor, 5...Phase control circuit, 6...Welding current detector, 7...Thyristor, 8...Relay.
Claims (1)
接機の溶接制御装置において、アーク起動を検出
する溶接電流検出器と、時定数切換機能を有する
誤差増幅器を備え、前記溶接電流検出器によつて
動作するリレーにより前記誤差増幅器の時定数を
アーク起動時に比べてアーク起動後は小さくなる
ように変化させる構成とした溶接制御装置。1. A welding control device for an arc welding machine using constant current feedback control, comprising a welding current detector for detecting arc starting and an error amplifier having a time constant switching function, and a relay operated by the welding current detector. A welding control device configured to change the time constant of the error amplifier so that it becomes smaller after starting the arc compared to when starting the arc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55129768A JPS5752570A (en) | 1980-09-16 | 1980-09-16 | Welding control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55129768A JPS5752570A (en) | 1980-09-16 | 1980-09-16 | Welding control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5752570A JPS5752570A (en) | 1982-03-29 |
| JPS645995B2 true JPS645995B2 (en) | 1989-02-01 |
Family
ID=15017720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55129768A Granted JPS5752570A (en) | 1980-09-16 | 1980-09-16 | Welding control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5752570A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5005332B2 (en) * | 2006-12-20 | 2012-08-22 | 株式会社ダイヘン | Arc start control method for consumable electrode arc welding |
-
1980
- 1980-09-16 JP JP55129768A patent/JPS5752570A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5752570A (en) | 1982-03-29 |
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