JPS6347552B2 - - Google Patents
Info
- Publication number
- JPS6347552B2 JPS6347552B2 JP4627983A JP4627983A JPS6347552B2 JP S6347552 B2 JPS6347552 B2 JP S6347552B2 JP 4627983 A JP4627983 A JP 4627983A JP 4627983 A JP4627983 A JP 4627983A JP S6347552 B2 JPS6347552 B2 JP S6347552B2
- Authority
- JP
- Japan
- Prior art keywords
- welding
- welding load
- output
- load current
- arc
- 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 47
- 230000005284 excitation Effects 0.000 claims description 5
- 238000010304 firing Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 8
- 239000010953 base metal Substances 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Classifications
-
- 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
- B23K9/067—Starting the arc
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding Control (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明はアークスタート特性を改良した消耗電
極直流アーク溶接機に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a consumable electrode DC arc welding machine with improved arc start characteristics.
従来例の構成とその問題点
従来の消耗電極直流アーク溶接機を第１図に示
す。１は消耗電極、２はアーク、３は母材、５は
制御電流器、６は溶接用トランス、７は溶接負荷
電圧比例信号発生器、８は出力設定用基準電圧発
生器、９は比較増幅器、１０は前記制御整流器５
の位相設定器である。Configuration of conventional example and its problems Figure 1 shows a conventional consumable electrode DC arc welding machine. 1 is a consumable electrode, 2 is an arc, 3 is a base metal, 5 is a control current generator, 6 is a welding transformer, 7 is a welding load voltage proportional signal generator, 8 is a reference voltage generator for output setting, 9 is a comparison amplifier , 10 is the control rectifier 5
This is a phase setter.
そして溶接負荷電圧比例信号Vfと出力設定用
基準電圧Vsを比較増幅器９で比較増幅し、出力
信号Vpを得る閉ループ系の直流アーク溶接機を
構成している。 The welding load voltage proportional signal V f and the output setting reference voltage V s are compared and amplified by a comparison amplifier 9 to form a closed-loop DC arc welding machine that obtains an output signal V p .
また比較増幅器９の従来例を第２図に詳細に示
す。R1，R2は入力抵抗、Rfはフイードバツク抵
抗、Ｃは平滑コンデンサ、ICは比較演算増幅器
である。これらの各部動作の動きを第３図に示
す。初期状態は出力設定用基準電圧発生器Vsの
みが比較演算増幅器ICへ入力されるため出力信
号Vpはフル出力となる。起動信号TSがONする
と高い無負荷電圧がフイードバツクされるため出
力信号Vpはフル出力から時定数CRfで下がる。消
耗電極１が母材にタツチし溶接負荷電流が流れる
と溶接負荷電流検出器４はオンにフイードバツク
電圧Vfは約ゼロＶに下がるため出力信号Vpはフ
ル出力に向けて上昇する。次にアークが発生する
とアーク電圧がフイードバツクされるため出力信
号Vpは時定数CRfを持つて定常値へ落ちつく。 Further, a conventional example of the comparison amplifier 9 is shown in detail in FIG. R 1 and R 2 are input resistances, R f is a feedback resistance, C is a smoothing capacitor, and IC is a comparison operational amplifier. The movements of these parts are shown in FIG. In the initial state, only the output setting reference voltage generator V s is input to the comparison operational amplifier IC, so the output signal V p becomes a full output. When the start signal TS turns ON, the high no-load voltage is fed back, so the output signal V p decreases from full output with the time constant CR f . When the consumable electrode 1 touches the base metal and the welding load current flows, the welding load current detector 4 turns on and the feedback voltage V f drops to approximately zero V, so the output signal V p rises toward full output. Next, when an arc occurs, the arc voltage is fed back, so the output signal V p settles to a steady value with a time constant CR f .
このように従来例では、アークスタート時に無
負荷電圧と電極短絡とアークの３状態が瞬時に推
移するため、円滑な定常値への移動が難しくアー
クスタートの失敗率が高い（第６図参照）。この
傾向は定常値の安定化のため時定数CRfを大きく
すればするほど大きくなる。 In this way, in the conventional example, the three states of no-load voltage, electrode short circuit, and arc change instantaneously at the time of arc start, making it difficult to smoothly move to a steady value and resulting in a high arc start failure rate (see Figure 6). . This tendency becomes larger as the time constant CR f is increased to stabilize the steady-state value.
発明の目的
本発明は前記従来例の欠点を除去し、閉ループ
系の直流アーク溶接機のアークスタート特性を良
好にすることを目的とするものである。OBJECTS OF THE INVENTION It is an object of the present invention to eliminate the drawbacks of the conventional examples and to improve the arc start characteristics of a closed-loop DC arc welding machine.
発明の構成
この目的を達成するために、溶接用トランスの
出力よりリアクトルを介し溶接負荷へ直流の電力
を供給する制御整流器と、前記制御整流器の点弧
位相を設定する位相設定器と、出力設定用基準電
圧発生器と、溶接負荷電流検出器と、溶接負荷電
圧比例信号発生器と、遅れ要素を持つ比較増幅器
とを具備し、前記比較増幅器の入力として、前記
出力設定用基準電圧と前記溶接負荷電流検出器の
励磁によりONとなる常開接点を介して入力され
る前記溶接負荷電圧比例信号とを有し、前記比較
増幅器の比較演算増幅器の入出力間に前記溶接負
荷電流検出器の励磁によりOFFとなる常閉接点
と定電圧ダイオードを直列に接続したものであ
る。この構成により、溶接負荷電流を検出するま
では、前記常開接点によつて比較増幅器への溶接
負荷電圧比例信号はOFFになり、出力設定用基
準電圧のみが入力され、かつアークスタートに最
適に選ばれた前記定電圧ダイオードにより出力信
号は抑制され、初期値が設定される。つぎに溶接
負荷電流が流れ前記常開接点がONとなり、前記
常閉接点がOFFとなると、溶接負荷電圧比例信
号がフイードバツクされ、比較増幅器の出力信号
は定常値へ時限をもつて円滑に移行するため、ア
ークスタート特性が良好になるものである。Composition of the Invention In order to achieve this object, a controlled rectifier that supplies DC power from the output of a welding transformer to a welding load via a reactor, a phase setting device that sets the firing phase of the controlled rectifier, and an output setting device are provided. a reference voltage generator for output setting, a welding load current detector, a welding load voltage proportional signal generator, and a comparison amplifier having a delay element, and the reference voltage for output setting and the welding voltage are used as inputs of the comparison amplifier. and the welding load voltage proportional signal input through a normally open contact that is turned ON by excitation of the load current detector, and the excitation of the welding load current detector is provided between the input and output of the comparison operational amplifier of the comparison amplifier. This is a series connection of a normally closed contact that turns OFF and a constant voltage diode. With this configuration, until the welding load current is detected, the welding load voltage proportional signal to the comparator amplifier is turned off by the normally open contact, and only the reference voltage for output setting is input, which is optimal for arc starting. The selected voltage regulator diode suppresses the output signal and sets the initial value. Next, when the welding load current flows and the normally open contact turns ON and the normally closed contact turns OFF, the welding load voltage proportional signal is fed back, and the output signal of the comparator amplifier smoothly transitions to the steady value with a time limit. Therefore, arc start characteristics are improved.
実施例の説明
以下、本発明の一実施例につき図面の第４図〜
第６図に沿つて詳細に説明する。DESCRIPTION OF EMBODIMENTS Hereinafter, one embodiment of the present invention will be explained in Figures 4 to 4 of the drawings.
This will be explained in detail with reference to FIG.
第４図において符号４，９以外の符号１，２，
３，５，６，７，８，１０は第１図の従来例と同
様である。本実施例では第１図の回路構成に溶接
負荷電流検出器４を付加し、比較増幅器９Ａを第
５図のように構成した。すなわち従来の比較増幅
器９（第２図）に対し、溶接負荷電流検出器４の
励磁によつてONする常開接点CRaと、OFFする
常閉接点CRbと、定電圧ダイオード（ツエナーダ
イオード）ZDを追加している。第５図は各部動
作の説明図である。 In FIG. 4, symbols 1, 2, other than 4, 9,
3, 5, 6, 7, 8, and 10 are the same as those in the conventional example shown in FIG. In this embodiment, a welding load current detector 4 was added to the circuit configuration shown in FIG. 1, and a comparison amplifier 9A was configured as shown in FIG. 5. In other words, in contrast to the conventional comparison amplifier 9 (Fig. 2), there is a normally open contact CR a that turns ON when the welding load current detector 4 is energized, a normally closed contact CR b that turns OFF, and a constant voltage diode (Zener diode). Adding ZD. FIG. 5 is an explanatory diagram of the operation of each part.
以下動作を説明すると、溶接負荷電流を検出す
るまで（溶接負荷電流検出器４の非励磁の期間）
は前記常開接点CRaによつて比較演算増幅器ICへ
の溶接負荷電圧比例信号Vfの入力はOFFされ、
出力設定用基準電圧Vsのみが入力される。従つ
て比較演算増幅器ICはフル出力になろうとする
が、アークスタートに最適に選ばれたツエナーダ
イオードZDにより出力信号Vpは抑制される。こ
のツエナーダイオードZDにより初期値が設定さ
れる。つぎに消耗電極１が母材３に接し溶接負荷
電流が流れ溶接負荷電流検出器４がオンすると比
較演算増幅器ICの入力へ溶接負荷電圧比例信号
VfがフイードバツクされツエナーダイオードZD
が比較演算増幅器ICから切り離されるため比較
演算増幅器ICの出力はツエナーダイオードZDの
レベルから定常値へ時限をもつて円滑に移行す
る。本実施例は従来例のように出力信号Vpが無
負荷、短絡、アークの３状態の影響を受けず、設
定値からアークへ移行するところに特長がある。 To explain the operation below, until the welding load current is detected (period of non-excitation of the welding load current detector 4)
The input of the welding load voltage proportional signal V f to the comparison operational amplifier IC is turned off by the normally open contact CR a , and
Only the output setting reference voltage Vs is input. Therefore, the comparison operational amplifier IC tries to reach full output, but the output signal V p is suppressed by the Zener diode ZD, which is optimally selected for arc start. The initial value is set by this Zener diode ZD. Next, when the consumable electrode 1 contacts the base metal 3 and the welding load current flows and the welding load current detector 4 turns on, a welding load voltage proportional signal is sent to the input of the comparison operational amplifier IC.
V f is fed back and Zener diode ZD
is separated from the comparator operational amplifier IC, so the output of the comparator operational amplifier IC smoothly transitions from the level of the Zener diode ZD to the steady state value with a time limit. The present embodiment is characterized in that the output signal V p is not affected by the three states of no load, short circuit, and arc, unlike the conventional example, and shifts from the set value to arc.
第６図にアークスタート成功率の従来との比較
にて示す。Ａ，Ｂはそれぞれ本実施例おび従来例
の特性を示す。 Figure 6 shows a comparison of the arc start success rate with the conventional method. A and B indicate the characteristics of this embodiment and the conventional example, respectively.
すなわち従来の成功率が約７割に対し、本実施
例によればほぼ完全なスタート成功率が得られた
ものである。 That is, compared to the conventional success rate of about 70%, this embodiment has an almost perfect start success rate.
発明の効果
以上のように、本発明によれば、直流アーク溶
接機のアークスタート特性が著しく改良され、従
つてアークスタート特性を特に重視する自動機や
ロボツト用溶接電源として優れた効果を奏するも
のである。Effects of the Invention As described above, according to the present invention, the arc start characteristics of a DC arc welding machine are significantly improved, and therefore, the welding power source for automatic machines and robots that places particular emphasis on arc start characteristics can exhibit excellent effects. It is.
第１図は従来の直流アーク溶接機のブロツク回
路図、第２図は同比較増幅器の具体回路図、第３
図ａ，ｂ，ｃ，ｄ，ｅは第２図の各部動作タイミ
ング図、第４図は本発明の一実施例における直流
アーク溶接機のブロツク回路図、第５図は同比較
増幅器の具体回路図、第６図は第５図の各部動作
タイミング図、第７図はアークスタート成功率の
比較特性図である。
１……消耗電極、２……アーク、３……母材、
４……溶接負荷電流検出器、５……制御整流器、
６……溶接用トランス、７……溶接負荷電圧比例
信号発生器、８……出力設定用基準電圧発生器、
９Ａ……比較増幅器、１０……位相設定器、Vs
……出力設定用基準電圧、Vf……溶接負荷電圧
比例信号、Vp……出力信号、R1，R2……入力抵
抗、Ｃ……コンデンサ、Rf……フイードバツク
抵抗、IC……比較演算増幅器、CRa……溶接負荷
電流検出器４の常開接点、CRb……溶接負荷電流
検出器４の常閉接点、ZD……ツエナーダイオー
ド（定電圧ダイオード）。
Figure 1 is a block circuit diagram of a conventional DC arc welding machine, Figure 2 is a specific circuit diagram of the comparison amplifier, and Figure 3 is a block circuit diagram of a conventional DC arc welding machine.
Figures a, b, c, d, and e are timing diagrams of the operation of each part in Figure 2, Figure 4 is a block circuit diagram of a DC arc welding machine according to an embodiment of the present invention, and Figure 5 is a specific circuit of the comparison amplifier. 6 is a timing diagram of the operation of each part in FIG. 5, and FIG. 7 is a comparative characteristic diagram of arc start success rate. 1...consumable electrode, 2...arc, 3...base material,
4... Welding load current detector, 5... Control rectifier,
6... Welding transformer, 7... Welding load voltage proportional signal generator, 8... Reference voltage generator for output setting,
9A...comparison amplifier, 10...phase setter, V s
...Reference voltage for output setting, V f ...Welding load voltage proportional signal, V p ...Output signal, R 1 , R 2 ... Input resistance, C ... Capacitor, R f ... Feedback resistance, IC ... Comparative operational amplifier, CR a ...normally open contact of welding load current detector 4, CR b ...normally closed contact of welding load current detector 4, ZD... Zener diode (constant voltage diode).
Claims (1)
溶接負荷へ直流の電力を供給する制御整流器と、
前記制御整流器の点弧位相を設定する位相設定器
と、出力設定用基準電圧発生器と、溶接負荷電流
検出器と、溶接負荷電圧比例信号発生器と、遅れ
要素を持つ比較増幅器とを具備し、前記比較増幅
器の入力として、前記出力設定用基準電圧と前記
溶接負荷電流検出器の励磁によりONとなる常開
接点を介して入力される前記溶接負荷電圧比例信
号とを有し、前記比較増幅器の比較演算増幅器の
入出力間に前記溶接負荷電流検出器の励磁により
OFFとなる常閉接点と定電圧ダイオードを直列
に接続した直流アーク溶接機。1. A control rectifier that supplies DC power from the output of the welding transformer to the welding load via the reactor;
It includes a phase setting device for setting the firing phase of the control rectifier, a reference voltage generator for output setting, a welding load current detector, a welding load voltage proportional signal generator, and a comparison amplifier having a delay element. , the comparison amplifier has, as an input, the output setting reference voltage and the welding load voltage proportional signal inputted through a normally open contact that is turned ON by excitation of the welding load current detector; Due to the excitation of the welding load current detector between the input and output of the comparison operational amplifier,
A DC arc welding machine with a normally closed contact that turns off and a constant voltage diode connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58046279A JPS59169667A (en) | 1983-03-18 | 1983-03-18 | DC arc welding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58046279A JPS59169667A (en) | 1983-03-18 | 1983-03-18 | DC arc welding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59169667A JPS59169667A (en) | 1984-09-25 |
| JPS6347552B2 true JPS6347552B2 (en) | 1988-09-22 |
Family
ID=12742787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58046279A Granted JPS59169667A (en) | 1983-03-18 | 1983-03-18 | DC arc welding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59169667A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61112447U (en) * | 1984-12-27 | 1986-07-16 |
-
1983
- 1983-03-18 JP JP58046279A patent/JPS59169667A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59169667A (en) | 1984-09-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS5823569A (en) | Dc arc welding device | |
| US4634830A (en) | Method of controlling constant-current for resistance welding machines | |
| US3875367A (en) | AC power source voltage regulator including outward voltage slope control | |
| US3504263A (en) | Self-oscillating switching type power supply | |
| JP3883857B2 (en) | Switching power supply device and power supply control method | |
| JPS6347552B2 (en) | ||
| US3205396A (en) | Arc welding apparatus | |
| KR910006099B1 (en) | Control device of power supply for arc welding | |
| JPH0156869B2 (en) | ||
| US2794142A (en) | Arc furnace control system | |
| JPS6245817Y2 (en) | ||
| JPS6272483A (en) | DC arc welding machine | |
| JPS6313525Y2 (en) | ||
| JPS6348631B2 (en) | ||
| JPH0615106B2 (en) | Welding power supply | |
| JPH0321820Y2 (en) | ||
| JPH0618708Y2 (en) | Plasma arc processing equipment | |
| JPS6235576Y2 (en) | ||
| JPH0243568Y2 (en) | ||
| JPS625707B2 (en) | ||
| JPH0615457A (en) | Plasma arc power supply | |
| JPH022548Y2 (en) | ||
| JP3161037B2 (en) | Power supply for arc welding | |
| JPS6228075A (en) | Consumable electrode type arc welding machine | |
| JPS6219405Y2 (en) |