JPS61186168A - Tig pulse welder - Google Patents

Tig pulse welder

Info

Publication number
JPS61186168A
JPS61186168A JP2441685A JP2441685A JPS61186168A JP S61186168 A JPS61186168 A JP S61186168A JP 2441685 A JP2441685 A JP 2441685A JP 2441685 A JP2441685 A JP 2441685A JP S61186168 A JPS61186168 A JP S61186168A
Authority
JP
Japan
Prior art keywords
reference voltage
current
pulse
slope
output
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.)
Granted
Application number
JP2441685A
Other languages
Japanese (ja)
Other versions
JPH0370580B2 (en
Inventor
Hirobumi Nomura
博文 野村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Via Mechanics Ltd
Original Assignee
Hitachi Seiko Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Seiko Ltd filed Critical Hitachi Seiko Ltd
Priority to JP2441685A priority Critical patent/JPS61186168A/en
Publication of JPS61186168A publication Critical patent/JPS61186168A/en
Publication of JPH0370580B2 publication Critical patent/JPH0370580B2/ja
Granted legal-status Critical Current

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  • Arc Welding Control (AREA)

Abstract

PURPOSE:To regulate the output current waveform of TIG pulse welder by providing the slope control part to vary the reference voltage level in slope shape at the change-over time of the reference voltage for pulse current setting and the reference voltage for base current setting. CONSTITUTION:A slope control part 12 is provided between change-over switches 7a, 7b of a pulse, base time control part 10 and errors amplifier 6. The reference voltage V3 varies in slope shape when the reference voltage V1 for pulse current setting and the reference voltage V2 for base current setting which are changed over alternately by the time set by the switches 7a, 7b are impressed on the control part 12. Accordingly the outputs of the amplifier 6 and output control part 3 are similarly changed and the output currents IP, IB of the transformer 2 for welding become in the pulse waveform of slope shape. The pulse TIG welder having the pulse current waveform of slope shape is thus obtd.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は、溶接部の入熱を制御す
るため、出力電流をパルス電流とベース電流に周期的に
変化させる電流フィードバック制御機能を備えたティグ
パルス溶接機に関する。
[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to TIG pulse welding, which is equipped with a current feedback control function that periodically changes the output current into a pulse current and a base current in order to control the heat input to the welding part. Regarding machines.

〔発明の背景〕 従来のティグパルス溶接機の制御ブロ
ック図を第4図に、電流制御用基準電圧と出力電流の波
形を第5図に示す。
[Background of the Invention] FIG. 4 shows a control block diagram of a conventional TIG pulse welding machine, and FIG. 5 shows the waveforms of the reference voltage for current control and the output current.

第4図において、入力端子1からの交流入力は溶接用変
圧器2で溶接に必要な電圧としてサイリスタ等の制御素
子により構成された交直切換可能な出力制御部3に加え
られ、出力制御部3の出力電流は溶接電流検出部4を通
り、出力端子5から負荷に供給される。出力制御部3の
出力電流は溶接電流検出部4で出力電流値に比例した電
圧に変換され、電流フィードバック信号■4として誤差
増幅器6の一方の入力端子に印加される。誤差増幅器6
の他方の入力端子には基準電圧V、が印加されるが、テ
ィグパルス溶接を行なう場合、この基準電圧V、は、パ
ルス、ベース時間制御部10の切換スイッチ7a、7b
により基準電圧源8からのパルス電流設定用基準電圧V
□と基準電圧源9からのベース電流設定用基準電圧v2
とに設定された時間で交互に切換えられる。そして、こ
の基準電圧V、と電流フィードバック信号■4との差信
号を誤差増幅器6で増幅してサイリスタ点弧用の移相器
11に加え、出力制御部3のサイリスタを位相制御する
ことにより、出力電流がパルス電流とベース電流に周期
的に変化するように電流フィードバック制御を行なって
いる。
In FIG. 4, an AC input from an input terminal 1 is applied as a voltage necessary for welding by a welding transformer 2 to an output control unit 3 that can switch between AC and DC, which is configured by control elements such as thyristors. The output current passes through the welding current detection section 4 and is supplied to the load from the output terminal 5. The output current of the output control section 3 is converted into a voltage proportional to the output current value by the welding current detection section 4, and is applied to one input terminal of the error amplifier 6 as a current feedback signal 4. error amplifier 6
When performing TIG pulse welding, this reference voltage V is applied to the other input terminal of the switch 7a, 7b of the pulse and base time control section 10.
The reference voltage V for pulse current setting from the reference voltage source 8 is
□ and reference voltage v2 for base current setting from reference voltage source 9
It is switched alternately at the set time. Then, the difference signal between this reference voltage V and the current feedback signal 4 is amplified by the error amplifier 6 and added to the phase shifter 11 for firing the thyristor, and the thyristor of the output control section 3 is controlled in phase. Current feedback control is performed so that the output current changes periodically into a pulse current and a base current.

このような電流フィードバック制御系を用いたティグパ
ルス溶接機では、誤差増幅器6に印加される基準電圧V
、は、第5図(イ)に示すようにパルス時間tpとベー
ス時間taでV□からv2へ、■2からvlへと急激に
レベル変化する。この基準電圧v3の変化に応じて誤差
増幅器6の出力が変化し、これを受けて出力制御部3は
出力電流を増減制御するが、溶接機の内部インピーダン
ス(溶接用変圧器、リアクタ等)により出力電流の変化
が遅れるため、誤差増幅器6に印加される基準電圧■、
と電流フィードバック信号v4との間に時間的なずれが
生じる。
In a TIG pulse welding machine using such a current feedback control system, the reference voltage V applied to the error amplifier 6
As shown in FIG. 5(a), the level changes rapidly from V□ to v2 and from ■2 to vl at pulse time tp and base time ta. The output of the error amplifier 6 changes in accordance with the change in the reference voltage v3, and in response to this, the output control section 3 controls the output current to increase or decrease. Since the change in the output current is delayed, the reference voltage applied to the error amplifier 6,
A time lag occurs between the current feedback signal v4 and the current feedback signal v4.

その結果、出力電流波形は第5図(ロ)、(ハ)に示す
ようになり、ベース電流IBからパルス電流IPへ切換
ねる時にはオーバシュート部Aが生じ、逆にパルス電流
IPからベース電流ISへ切換ねる時にはアンダシュー
ト部Bが生じる。この現象はパルス、ベース両電流の差
が大きいほど顕著に現われる。
As a result, the output current waveform becomes as shown in Fig. 5 (b) and (c), and when switching from the base current IB to the pulse current IP, an overshoot portion A occurs, and conversely, from the pulse current IP to the base current IS When switching to , an undershoot portion B occurs. This phenomenon becomes more pronounced as the difference between the pulse and base currents increases.

このようなパルス波形の電流で溶接を行なうと、(1)
オーバシュート部Aでの強いアーク力により溶融池が波
立って、ビードの波目が不均一となり、ビード外観が悪
くなる。
When welding with a current with such a pulse waveform, (1)
The strong arc force at the overshoot portion A causes the molten pool to ripple, making the undulations of the bead uneven and deteriorating the appearance of the bead.

(2)溶加棒を用いる溶接作業では、オーバシュート部
Aでの強いアーク力に妨げられて溶加棒を挿入しずらく
、溶は込みがスムーズにいかな11為。
(2) In welding work using a filler rod, the strong arc force at the overshoot part A makes it difficult to insert the filler rod, making it difficult to penetrate the weld smoothly11.

(3)大電流により電極の消耗が早くなる。(3) Electrodes wear out quickly due to large current.

(4)パルス、ベース電流のレベル差が大きい場合、ア
ンダシュート部Bでアーク切れしやすい。
(4) If the level difference between the pulse and base currents is large, arc breakage is likely to occur at the undershoot portion B.

等の問題点が発生する。Problems such as this occur.

〔発明の目的〕 本発明の目的は、上記した従来技術の
問題点を解消し、ティグパルス溶接の溶接作業性、溶接
品質を向上させるとともに、電極消耗を低減することに
ある。
[Object of the Invention] An object of the present invention is to solve the problems of the prior art described above, improve welding workability and welding quality of TIG pulse welding, and reduce electrode wear.

〔発明の概要〕 本発明は、溶接電流検出部、該検出部
からの電流フィードバック信号と基準電圧との差信号を
増幅する誤差増幅器および該増幅器の出力により作動す
る出力制御部を有し、切換スイッチにより前記基準電圧
を設定された時間でパルス電流設定用基f!!電圧とベ
ース電流設定用基準電圧とに交互に切換えて、出力電流
をパルス電流とベース電流に周期的に変化させるように
したティクパルス溶接機において、前記パルス電流制御
用基準電圧と前記ベース電流設定用基準電圧との切換え
時に基準電圧レベルをスロープ状に変化させるスロープ
制御部を備えたことを特徴とするものである。
[Summary of the Invention] The present invention includes a welding current detection section, an error amplifier that amplifies a difference signal between a current feedback signal from the detection section and a reference voltage, and an output control section operated by the output of the amplifier. The pulse current setting base f! at the time when the reference voltage is set by the switch. ! In a tick pulse welding machine, the voltage and the reference voltage for setting the base current are alternately switched to periodically change the output current into the pulse current and the base current, and the reference voltage for controlling the pulse current and the reference voltage for setting the base current are alternately switched. The present invention is characterized in that it includes a slope control section that changes the reference voltage level in a slope shape when switching from the reference voltage.

〔発明の実施例〕 本発明の一実施例の制御ブロック図
を第1図に、スロープ制御部の回路例を第2図に、電流
制御用基準電圧と出力電流の波形を第3図に示す。
[Embodiment of the Invention] Fig. 1 shows a control block diagram of an embodiment of the invention, Fig. 2 shows a circuit example of the slope control section, and Fig. 3 shows the waveforms of the reference voltage for current control and the output current. .

第1図において、1〜11は第4図と対応する部分で、
制御系の基本的構成は第4図の従来例と同一であるが、
本発明では切換スイッチ7a、7bと誤差増幅器6との
間にスロープ制御部12を設け、パルス、ベース時間制
御部10の切換スイッチ7a、7bにより設定された時
間で交互に切換えられるパルス電流設定用基準電圧V工
とベース電流設定用基準電圧v2をスロープ制御部12
に印加し、パルス、ベース各基準電圧の切換え時に基準
電圧レベルをスロープ状に変化させる点が従来例と異な
る。
In Fig. 1, 1 to 11 are parts corresponding to Fig. 4,
The basic configuration of the control system is the same as the conventional example shown in Figure 4, but
In the present invention, a slope control section 12 is provided between the changeover switches 7a and 7b and the error amplifier 6, and the slope control section 12 is used for pulse current setting which is alternately switched at the time set by the changeover switches 7a and 7b of the pulse and base time control section 10. The slope control unit 12 controls the reference voltage V and the base current setting reference voltage v2.
This differs from the conventional example in that the reference voltage level is changed in a slope shape when switching between the pulse and base reference voltages.

スロープ制御部12は、例えば第2図に示すように切換
スイッチ7a、7bを介して印加されるパルス、ベース
各基準電圧vi、v2を分圧する抵抗R□、R2と、抵
抗R2にスロープ緩急選択スイッチ13を介して並列接
続されるコンデンサC1、C2、C3を備え、抵抗R2
の端子電圧を基準電圧v3として誤差増幅器6に印加す
るように構成される。
For example, as shown in FIG. 2, the slope control unit 12 includes resistors R□ and R2 that divide the pulses and base reference voltages vi and v2 applied via the changeover switches 7a and 7b, and a slope fast/fast selector for the resistor R2. Comprising capacitors C1, C2, and C3 connected in parallel via a switch 13, and a resistor R2.
The terminal voltage is applied to the error amplifier 6 as a reference voltage v3.

このスロープ制御部12により、パルス、ベース各基準
電圧■いv2の切換え時に、基準電圧V、の電圧レベル
は抵抗R1,R2とスロープ緩急選択スイッチ13によ
り選択されたコンデンサとの時定数でスロープ状に変化
する。
This slope control section 12 controls the voltage level of the reference voltage V when switching between the pulse and base reference voltages V2 and V2 in a slope shape according to the time constant of the resistors R1 and R2 and the capacitor selected by the slope adjustment switch 13. Changes to

ここでコンデンサ容量をC□〈C2くC3とすると、C
□、C2、C1のいずれを選択するかにより、基準電圧
■□のスロープ状変化の緩急の度合を第3図(イ)のa
、b、cのように変えることができる。
Here, if the capacitor capacity is C□<C2 × C3, then C
Depending on which of □, C2, or C1 is selected, the degree of slowness of the slope change of the reference voltage □ is determined by a in Figure 3 (A).
, b, c.

この基準電圧V、のレベル変化に応じて誤差増幅器6の
出力も同様に変化するので、移相器11を介して出力制
御部3のサイリスタを位相制御することにより、出力電
流も第3図(ロ)、(ハ)に示すように、ベース電流I
Bからパルス電流IPへ、またパルス電流IPからベー
ス電流IBへスロープ状に変化するパルス波形となる。
Since the output of the error amplifier 6 similarly changes according to the level change of the reference voltage V, by controlling the phase of the thyristor of the output control section 3 via the phase shifter 11, the output current can also be changed as shown in FIG. As shown in (b) and (c), the base current I
The pulse waveform changes in a slope from B to pulse current IP, and from pulse current IP to base current IB.

この出力電流のスロープ状変化は、コンデンサC1,C
,、C3のいずれを選択するかで第3図(ロ)、(ハ)
のa′。
This slope change in output current is caused by capacitors C1 and C
, , Figure 3 (b) and (c) depending on which of C3 is selected.
a′.

b′、C′のようになる。b', C'.

つまり、パルス、ベース各基準電圧Vいv2の切換え時
に基準電圧レベルをスロープ状に変化させれ、ば、基準
電圧レベルを急激に変化させた場合のように出力電流の
変化の遅れによって出方電流のオーバシュートやアンダ
シュートを生じることがなく、出力電流はベース電流I
Qからパルス電流IPへ、またパルス電流IPからベー
ス電流IQへゆるやかに変化することになる。
In other words, if the reference voltage level is changed in a slope shape when switching between the pulse and base reference voltages V2 and 2, the output current will change due to a delay in the change in the output current, as in the case where the reference voltage level is suddenly changed. There is no overshoot or undershoot of the output current, and the output current is equal to the base current I.
There is a gradual change from Q to pulse current IP, and from pulse current IP to base current IQ.

この電流変化の緩急の度合は、スロープ緩急選択スイッ
チ■3により、被溶接物の材質、継手形状、ビード外観
等に応じて選択することができる。
The degree of speed of this current change can be selected depending on the material of the object to be welded, the shape of the joint, the appearance of the bead, etc. using the slope slope selection switch (3).

前記した基準電圧のスロープ制御は積分器を用いて行な
うことも可能である。
The slope control of the reference voltage described above can also be performed using an integrator.

〔発明の効果〕 本発明は、制御系の外乱に対する応答
性を低下させないで、パルス、ベース電流の切換え時に
オーバシュートやアンダシュートのないスロープ状に変
化する出力電流波形が得られる点に特徴があり、ベース
電流からパルス電流へ。
[Effects of the Invention] The present invention is characterized in that an output current waveform that changes in a slope shape without overshoot or undershoot can be obtained when switching between pulse and base current without reducing the responsiveness of the control system to disturbances. Yes, from base current to pulse current.

パルス電流からベース電流への電流変化がゆるやかでオ
ーバシュートやアンダシュートがなく、アークがソフト
になるため、波目が均一できれいなビードが得られ、ま
た溶加棒も挿入しやすく、スムーズに溶接作業ができ、
パルス、ベース電流のレベル差が大きい場合でもアーク
切れがなくなる等、溶接作業性、溶接品質が向上し、さ
らにオーバシュートによる過大電流がなくなるため、電
極消耗も低減することができる。
The current change from the pulse current to the base current is gradual, there is no overshoot or undershoot, and the arc is soft, making it possible to obtain a clean bead with uniform waves, and it is also easy to insert the filler rod, resulting in smooth welding. able to work,
Welding workability and welding quality are improved by eliminating arc breakage even when there is a large level difference between the pulse and base currents, and electrode wear can also be reduced because excessive current due to overshoot is eliminated.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の一実施例を示す制御ブロック図、第2
図は第1図中のスロープ制御部の回路図。 第:3図(イ)、(ロ)、(ハ)はその基準電圧と出力
電流の波形図、第4図は従来例の制御ブロック図。 第5図(イ)、(ロ)、(ハ)はその基準電圧と出方電
流の波形図である。 3・・・出力制御部    4・・・溶接電流検出部6
・・・誤差増幅器    7a、7b・・・切換スイッ
チ12・・・スロープ制御部 vl・・・パルス電流設定用基準電圧 v2・・・ベース電流設定用基準電圧 v3・・・基準電圧
FIG. 1 is a control block diagram showing one embodiment of the present invention, and FIG.
The figure is a circuit diagram of the slope control section in FIG. 1. Figures 3 (A), (B), and (C) are waveform diagrams of the reference voltage and output current, and Figure 4 is a control block diagram of the conventional example. FIGS. 5(a), (b), and (c) are waveform diagrams of the reference voltage and output current. 3... Output control section 4... Welding current detection section 6
...Error amplifier 7a, 7b...Selector switch 12...Slope control section vl...Reference voltage for pulse current setting v2...Reference voltage for base current setting v3...Reference voltage

Claims (1)

【特許請求の範囲】[Claims]  溶接電流検出部、該検出部からの電流フィードバック
信号と基準電圧との差信号を増幅する誤差増幅器および
該増幅器の出力により作動する出力制御部を有し、切換
スイッチにより前記基準電圧を設定された時間でパルス
電流設定用基準電圧とベース電流設定用基準電圧とに交
互に切換えて、出力電流をパルス電流とベース電流に周
期的に変化させるようにしたティグパルス溶接機におい
て、前記パルス電流設定用基準電圧と前記ベース電流設
定用基準電圧との切換え時に基準電圧レベルをスロープ
状に変化させるスロープ制御部を備えたことを特徴とす
るティグパルス溶接機。
It has a welding current detection section, an error amplifier that amplifies a difference signal between a current feedback signal from the detection section and a reference voltage, and an output control section operated by the output of the amplifier, and the reference voltage is set by a changeover switch. In a TIG pulse welding machine, the reference voltage for setting the pulse current and the reference voltage for setting the base current are alternately switched over time to periodically change the output current to the pulse current and the base current. A TIG pulse welding machine characterized by comprising a slope control section that changes the reference voltage level in a slope shape when switching between the voltage and the reference voltage for setting the base current.
JP2441685A 1985-02-13 1985-02-13 Tig pulse welder Granted JPS61186168A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2441685A JPS61186168A (en) 1985-02-13 1985-02-13 Tig pulse welder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2441685A JPS61186168A (en) 1985-02-13 1985-02-13 Tig pulse welder

Publications (2)

Publication Number Publication Date
JPS61186168A true JPS61186168A (en) 1986-08-19
JPH0370580B2 JPH0370580B2 (en) 1991-11-08

Family

ID=12137550

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2441685A Granted JPS61186168A (en) 1985-02-13 1985-02-13 Tig pulse welder

Country Status (1)

Country Link
JP (1) JPS61186168A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05184708A (en) * 1991-06-11 1993-07-27 Kegel Co Inc Maintenance device for bowling lane
JP2003285163A (en) * 2002-03-27 2003-10-07 Daihen Corp Method for controlling pulsed arc welding

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5884677A (en) * 1981-11-16 1983-05-20 Hitachi Seiko Ltd Arc stabilizing method in pulse arc welding
JPS58157574A (en) * 1982-03-15 1983-09-19 Hitachi Seiko Ltd Stabilizing of arc in pulse arc welding

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5884677A (en) * 1981-11-16 1983-05-20 Hitachi Seiko Ltd Arc stabilizing method in pulse arc welding
JPS58157574A (en) * 1982-03-15 1983-09-19 Hitachi Seiko Ltd Stabilizing of arc in pulse arc welding

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05184708A (en) * 1991-06-11 1993-07-27 Kegel Co Inc Maintenance device for bowling lane
JP2003285163A (en) * 2002-03-27 2003-10-07 Daihen Corp Method for controlling pulsed arc welding

Also Published As

Publication number Publication date
JPH0370580B2 (en) 1991-11-08

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