JP2543270B2 - Arc welding machine - Google Patents
Arc welding machineInfo
- Publication number
- JP2543270B2 JP2543270B2 JP3137640A JP13764091A JP2543270B2 JP 2543270 B2 JP2543270 B2 JP 2543270B2 JP 3137640 A JP3137640 A JP 3137640A JP 13764091 A JP13764091 A JP 13764091A JP 2543270 B2 JP2543270 B2 JP 2543270B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- drive signal
- switching element
- arc
- welding
- 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 - Lifetime
Links
Landscapes
- Arc Welding In General (AREA)
- Arc Welding Control (AREA)
- Generation Of Surge Voltage And Current (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、アルミニウムやマグネ
シウムなど酸化皮膜除去を必要とする材料の溶接に使用
されるアーク溶接機に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arc welding machine used for welding materials such as aluminum and magnesium that require oxide film removal.
【0002】[0002]
【従来の技術】従来、アルミニウムやマグネシウムなど
溶接時に酸化皮膜除去を必要とする材料の溶接には交流
アーク溶接機が使用され、図3に従来の交流アーク溶接
機の回路構成の一例を示す。2. Description of the Related Art Conventionally, an AC arc welder has been used for welding materials such as aluminum and magnesium that require removal of an oxide film at the time of welding. FIG. 3 shows an example of the circuit configuration of a conventional AC arc welder.
【0003】図3において、1は商用電源、2と5は整
流ダイオード、3はスイッチング素子、4は溶接トラン
ス、6aと6bはコンデンサ、7は被溶接物、8はアー
ク負荷、9は電極、10aと10bはスイッチング素
子、11aはスイッチング素子10aを駆動するドライ
ブ信号回路A、11bはスイッチング素子10bを駆動
するドライブ信号回路B、12はドライブ信号回路A1
1aおよびドライブ信号回路B11bのパルス周期を決
定する発振回路、13は反転器である。In FIG. 3, 1 is a commercial power source, 2 and 5 are rectifying diodes, 3 is a switching element, 4 is a welding transformer, 6a and 6b are capacitors, 7 is a workpiece, 8 is an arc load, 9 is an electrode, 10a and 10b are switching elements, 11a is a drive signal circuit A for driving the switching element 10a, 11b is a drive signal circuit B for driving the switching element 10b, and 12 is a drive signal circuit A1.
An oscillating circuit that determines the pulse periods of 1a and the drive signal circuit B11b, and 13 is an inverter.
【0004】図3に示す回路において、商用電源1を整
流ダイオード2で整流し、その整流出力をスイッチング
素子3でスイッチングし、その交流出力を溶接トランス
4で降圧絶縁し、その出力端に2個のコンデンサ6aと
6bの直列回路と2個のスイッチング素子10aと10
bの直列回路をそれぞれ接続し、2個のコンデンサ6a
と6bの接続点と2個のスイッチング素子10aと10
bの接続点の間に溶接負荷、すなわち被溶接物(母材)
7と電極9とアーク8を接続し、2個のスイッチング素
子10aと10bの内、一方のスイッチング素子10a
にドライブ信号回路A11aを接続し、他方のスイッチ
ング素子10bにはドライブ信号回路B11bを接続
し、さらにドライブ信号回路A11aには発振回路12
の出力パルスが直接に、ドライブ信号回路B11bには
発振回路12の出力が反転回路13によって極性が反転
されて接続されている。In the circuit shown in FIG. 3, the commercial power source 1 is rectified by a rectifying diode 2, the rectified output is switched by a switching element 3, the AC output is stepped down by a welding transformer 4, and two output terminals are provided. Series circuit of capacitors 6a and 6b and two switching elements 10a and 10
b series circuits are connected to each other, and two capacitors 6a
And 6b connection point and two switching elements 10a and 10
Welding load between the connection points of b, that is, the workpiece (base metal)
7, the electrode 9 and the arc 8 are connected to each other, and one of the two switching elements 10a and 10b is connected to the switching element 10a.
Is connected to the drive signal circuit A11a, the other switching element 10b is connected to the drive signal circuit B11b, and the drive signal circuit A11a is connected to the oscillator circuit 12
Is directly connected to the drive signal circuit B11b with the polarity of the output of the oscillation circuit 12 inverted by the inversion circuit 13.
【0005】発振回路12の出力波形に同期したパルス
出力がドライブ信号回路A11aから出力され、スイッ
チング素子10aのON・OFFを繰り返す。一方、ド
ライブ信号回路B11bには発振回路12の出力が反転
器13で反転して入力されているので、ドライブ信号回
路B11bはスイッチング素子10aとは交互にスイッ
チング素子10bをON・OFFさせる。A pulse output synchronized with the output waveform of the oscillation circuit 12 is output from the drive signal circuit A11a, and the switching element 10a is repeatedly turned on and off. On the other hand, since the output of the oscillation circuit 12 is inverted and input to the drive signal circuit B11b by the inverter 13, the drive signal circuit B11b turns the switching element 10b on and off alternately with the switching element 10a.
【0006】この動作によりスイッチング素子10aが
ONし、スイッチング素子10bがOFFのときには、
電流はスイッチング素子10a→電極9→アーク負荷8
→被溶接物7→コンデンサ6bの経過で流れ、逆にスイ
ッチング素子10aがOFFでスイッチング素子10b
がONの場合には、電流はコンデンサ6a→被溶接物7
→アーク負荷8→電極9→スイッチング素子10bと流
れる。したがってアーク負荷8には図4に示す交流電流
が流れる。By this operation, when the switching element 10a is turned on and the switching element 10b is turned off,
Current is switching element 10a → electrode 9 → arc load 8
→ Welding object 7 → Flowing in the course of capacitor 6b, conversely switching element 10a is OFF and switching element 10b
When is ON, the current is from capacitor 6a to workpiece 7
→ Arc load 8 → Electrode 9 → Switching element 10b. Therefore, the alternating current shown in FIG. 4 flows through the arc load 8.
【0007】アーク負荷8に電極9側がプラスの電流が
流れている期間には、被溶接物7の母材より融点の高い
酸化被膜を除去する作用があり、電極9側がマイナスの
期間においては、被溶接物7を溶かす作用が強いため、
アルミニウムやマグネシウム等の溶接にはこの種の交流
アーク溶接機が使われていた。During the period in which a positive current is flowing through the arc load 8 on the electrode 9 side, it has the effect of removing the oxide film having a higher melting point than the base metal of the workpiece 7, and during the period in which the electrode 9 side is negative, Since it has a strong effect of melting the workpiece 7,
This kind of AC arc welding machine was used for welding aluminum and magnesium.
【0008】[0008]
【発明が解決しようとする課題】しかし、上記した交流
アーク溶接機では、アルミニウム材やマグネシウム材の
溶接を行った場合、アークの指向性が悪いため、 (1) 隅肉溶接が難しい (2) 裏波溶接が難しい 等の欠点があり、また極性反転時の高調波のため、 (3) アーク音が高い さらに、電極側+の電流が流れるときの電極加熱効果に
より (4) 電極消耗が速い 等の問題点があった。However, in the AC arc welding machine described above, when aluminum material or magnesium material is welded, the directivity of the arc is poor, so that (1) fillet welding is difficult (2) It has drawbacks such as difficulty in back-side welding, and it is a harmonic when the polarity is reversed. (3) Arc noise is high. Furthermore, due to the electrode heating effect when the current on the electrode side + flows, (4) Electrode wear is fast. There were problems such as.
【0009】本発明は、上記の従来の問題を解決しよう
とするもので、アーク指向性と安定性を増加させ、また
電極加熱効果を減少させて、隅肉溶接と裏波溶接を行う
ことを容易にすると同時に電極の消耗を抑制し、さらに
アーク音を低減させることを目的とする。SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned conventional problems, and increases fillet welding and backside welding by increasing arc directivity and stability and reducing the electrode heating effect. The purpose of this is to make it easy and at the same time suppress the consumption of electrodes and further reduce the arc noise.
【0010】[0010]
【課題を解決するための手段】上記の目的を達成するた
めに、本発明のアーク溶接機は溶接用トランスの2次側
に整流回路を接続し、その出力端に、2個のコンデンサ
の直列接続回路と、2個のスイッチング素子の直列接続
回路とをそれぞれ接続し、2個のコンデンサの直列接続
の中点と2個のスイッチング素子の直列接続の中点の間
に溶接負荷を接続し、前記2個のスイッチング素子のう
ち一方のスイッチング素子を駆動するドライブ信号回路
Aと、そのドライブ信号回路Aの反転信号を出力し他方
のスイッチング素子を駆動するドライブ信号回路Bと、
前記2つのドライブ信号回路AとBのパルス周期を決意
する発振回路と、その発振回路が一定の周期で発振と停
止動作を繰り返すための信号をその発振回路に入力する
タイマー回路を備えた構成にしたものである。In order to achieve the above object, the arc welding machine of the present invention has a rectifier circuit connected to the secondary side of a welding transformer and has two capacitors connected in series at its output end. A connection circuit and a series connection circuit of two switching elements are respectively connected, and a welding load is connected between the midpoint of the series connection of the two capacitors and the midpoint of the series connection of the two switching elements, A drive signal circuit A that drives one of the two switching elements, and a drive signal circuit B that outputs an inverted signal of the drive signal circuit A and drives the other switching element.
An oscillator circuit that determines the pulse period of the two drive signal circuits A and B, and a timer circuit that inputs a signal for the oscillator circuit to repeat oscillation and stop operation at a constant period to the oscillator circuit It was done.
【0011】[0011]
【作用】上記した構成により、従来の交流電流に電極側
マイナスの直流電流が周期的に混合されることになり、
交流特性に電極側マイナスの直流特性が加わることにな
る。これにより、電極側マイナスの期間においては電極
が熱陰極となり極点が安定するためアークの指向性が増
し、アークが安定し、かつ電極側プラスの場合のような
電極加熱効果がなく電極の消耗が抑制される。また直流
混合時には極性反転がないため高調波による騒音がなく
なり、アーク音が低減する。With the above structure, the negative AC current on the electrode side is periodically mixed with the conventional AC current,
The negative DC characteristic on the electrode side is added to the AC characteristic. As a result, the electrode becomes a hot cathode during the minus side of the electrode side, and the pole point is stabilized, so that the directivity of the arc is increased, the arc is stabilized, and there is no electrode heating effect as in the case of the plus side of the electrode, resulting in electrode wear. Suppressed. In addition, since there is no polarity reversal during DC mixing, noise due to harmonics is eliminated and arc noise is reduced.
【0012】[0012]
【実施例】以下、本発明の交流アーク溶接機の一実施例
について図面を参照しながら説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the AC arc welding machine of the present invention will be described below with reference to the drawings.
【0013】図1において、主回路構成は従来例を示す
図3と同じであるので、溶接トランス4の一次側は省略
してある。また、その他の部分についても、図3と同じ
部分については同じ符号を付し、異なる部分について説
明する。図1において、14はタイマー回路、15はパ
ルス幅調整回路である。In FIG. 1, the main circuit configuration is the same as that of the conventional example shown in FIG. 3, so the primary side of the welding transformer 4 is omitted. Also, with respect to other portions, the same portions as those in FIG. 3 are denoted by the same reference numerals, and different portions will be described. In FIG. 1, 14 is a timer circuit, and 15 is a pulse width adjusting circuit.
【0014】図1に示す回路において、タイマー回路1
4が一定の周期でONとOFFを繰り返すと発振回路1
2が連動して、タイマー回路14がONの時に発振回路
12が発振し、タイマー回路14がOFFの時に発振回
路12は発振を停止し、タイマー回路14と発振回路1
2はこの動作を繰り返す。タイマー回路14がONの場
合には従来例と同様に、スイッチング素子10aと10
bを交互にON・OFFさせる信号を発振回路12から
の信号に基づいてドライブ回路A11aとドライブ回路
B11bが出力するため、図2に示すようにTACの期
間、交流電流が流れる。一方、タイマー回路14がOF
Fの場合には、発振回路12は発振を停止するが、スイ
ッチング素子10aはONを、スイッチング素子10b
はOFFを続けるため、電流はコンデンサ6a→被溶接
物7→アーク負荷8→電極9→スイッチング素子10b
と流れ、図2に示すようにTDCの期間、電極側マイナス
の直流電流が流れる。In the circuit shown in FIG. 1, the timer circuit 1
Oscillation circuit 1 when 4 repeats ON and OFF in a constant cycle
When the timer circuit 14 is turned on, the oscillation circuit 12 oscillates, and when the timer circuit 14 is turned off, the oscillation circuit 12 stops oscillating, and the timer circuit 14 and the oscillation circuit 1
2 repeats this operation. When the timer circuit 14 is ON, the switching elements 10a and 10
Since the drive circuit A11a and the drive circuit B11b output a signal for alternately turning on and off b based on the signal from the oscillation circuit 12, an alternating current flows during the period of T AC as shown in FIG. On the other hand, the timer circuit 14 is OF
In the case of F, the oscillation circuit 12 stops the oscillation, but the switching element 10a is turned on and the switching element 10b is turned on.
Is kept off, the current flows from the capacitor 6a to the workpiece 7 to the arc load 8 to the electrode 9 to the switching element 10b.
2 and a negative DC current on the electrode side flows during the period T DC as shown in FIG.
【0015】このようにタイマー回路14のON・OF
Fに応じて交流電流と直流電流が交互に流れる混合電流
を容易に得ることができる。したがってタイマー回路1
4の時限設定次第で、直流電流期間比率=TOFF/(T
ON+TOFF)=TDC/(TAC+TDC)を自由に選ぶこと
ができる。In this way, the ON / OF of the timer circuit 14 is
A mixed current in which alternating current and direct current flow alternately according to F can be easily obtained. Therefore, the timer circuit 1
Depending on the time limit setting of 4, the DC current period ratio = T OFF / (T
ON + T OFF ) = T DC / (T AC + T DC ) can be freely selected.
【0016】また、上記直流電流期間比率を固定した場
合でも、パルス幅調整回路15により発振回路12の発
振動作時におけるパルス幅を狭めると、ドライブ信号回
路A11aのパルス幅は狭く、ドライブ信号回路B11
bのパルス幅は広くなり、それに伴ってスイッチング素
子10bの導通期が広がり電極側マイナスの電流の比率
が大きくなるので、直流電流期間比率を大きくしたのと
同じ効果が得られ、熱陰極放電の期間比率が大きくな
り、アークの指向性と安定性が増し、また電極加熱効果
が小さくなり電極消耗が抑制される。Even when the DC current period ratio is fixed, if the pulse width adjusting circuit 15 narrows the pulse width during the oscillating operation of the oscillating circuit 12, the pulse width of the drive signal circuit A11a becomes narrow and the drive signal circuit B11 becomes narrow.
Since the pulse width of b becomes wider and the conduction period of the switching element 10b becomes wider and the ratio of the negative current on the electrode side increases accordingly, the same effect as increasing the DC current period ratio is obtained, and the hot cathode discharge The period ratio increases, the directivity and stability of the arc increase, the electrode heating effect decreases, and electrode consumption is suppressed.
【0017】[0017]
【発明の効果】以上の説明から明らかなように本発明に
よれば、交流電流期間と電極側マイナスの直流電流期間
を周期的に交互に繰り返し、直流電流期間の比率を大き
してアーク溶接を行うことにより、熱陰極放電の期間比
率が大きくなり、この期間は極点が安定するため、アー
クの指向性と安定性が増してアルミニウムやマグネシウ
ムなどの隅肉溶接や裏波溶接を容易にし、電極側プラス
の場合に発生する電極加熱効果を減少させて電極消耗を
抑制する。さらに、直流電流期間を設けることにより、
極性反転時の高調波発生が少なくなり、アーク音を低減
させる効果もある。As is apparent from the above description, according to the present invention, the alternating current period and the negative direct current period on the electrode side are alternately repeated periodically to increase the ratio of the direct current period to perform arc welding. By doing so, the period ratio of hot cathode discharge increases, and the poles stabilize during this period, so the directivity and stability of the arc increase, facilitating fillet welding and backside welding of aluminum, magnesium, etc. The electrode heating effect generated in the case of side plus is reduced to suppress the electrode consumption. Furthermore, by providing a direct current period,
The generation of higher harmonics at the time of polarity reversal is reduced, which also has the effect of reducing arc noise.
【図1】本発明のアーク溶接機の一実施例を示す回路構
成図FIG. 1 is a circuit configuration diagram showing an embodiment of an arc welding machine of the present invention.
【図2】同実施例における出力電流の波形図FIG. 2 is a waveform diagram of output current in the same example.
【図3】従来例における回路構成図FIG. 3 is a circuit configuration diagram in a conventional example.
【図4】従来例における出力電流の波形図FIG. 4 is a waveform diagram of output current in a conventional example.
4 溶接トランス 5 整流ダイオード(整流回路) 6a,6b コンデンサ 7 被溶接物 8 アーク負荷 9 電極 10a,10b スイッチング素子 11a ドライブ信号回路A 11b ドライブ信号回路B 12 発振回路 14 タイマー回路 15 パルス幅調整回路 4 Welding transformer 5 Rectifier diode (rectifier circuit) 6a, 6b Capacitor 7 Welding object 8 Arc load 9 Electrodes 10a, 10b Switching element 11a Drive signal circuit A 11b Drive signal circuit B 12 Oscillation circuit 14 Timer circuit 15 Pulse width adjustment circuit
Claims (2)
し、その出力端に2個のコンデンサの直列回路と2個の
スイッチング素子の直列回路をそれぞれ接続し、2個の
コンデンサの直列接続の中点と2個のスイッチング素子
の直列接続の中点との間に溶接負荷を接続し、前記2個
のスイッチング素子のうち一方のスイッチング素子を駆
動するドライブ信号回路Aと、そのドライブ信号回路A
の反転信号を出力し他方のスイッチング素子を駆動する
ドライブ信号回路Bと、前記2つのドライブ信号回路
A,Bのパルス周期を決定する発振回路と、その発振回
路が一定の周期で発振と停止動作を繰り返すための信号
をその発振回路に入力するタイマー回路を備えたアーク
溶接機。1. A rectifier circuit is connected to the secondary side of a welding transformer, and a series circuit of two capacitors and a series circuit of two switching elements are connected to the output terminals of the rectifier circuit, respectively, and two capacitors are connected in series. Drive signal circuit A for driving one switching element of the two switching elements by connecting a welding load between the middle point and the middle point of the series connection of two switching elements, and the drive signal circuit A
Drive signal circuit B for outputting the inversion signal of the other drive circuit and driving the other switching element, an oscillation circuit for determining the pulse period of the two drive signal circuits A and B, and the oscillation circuit oscillates and stops at a constant period. An arc welding machine equipped with a timer circuit that inputs a signal for repeating the above to the oscillation circuit.
項1記載のアーク溶接機。2. The arc welding machine according to claim 1, further comprising a pulse width adjusting circuit for the oscillation circuit.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3137640A JP2543270B2 (en) | 1991-06-10 | 1991-06-10 | Arc welding machine |
EP92108831A EP0516033B1 (en) | 1991-05-31 | 1992-05-26 | Arc welding machine and method |
DE69212708T DE69212708T2 (en) | 1991-05-31 | 1992-05-26 | Method and device for arc welding |
CA002069663A CA2069663C (en) | 1991-05-31 | 1992-05-27 | Arc welding machine and method |
US07/890,573 US5283419A (en) | 1991-05-31 | 1992-05-28 | Arc welding machine and method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3137640A JP2543270B2 (en) | 1991-06-10 | 1991-06-10 | Arc welding machine |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH04361873A JPH04361873A (en) | 1992-12-15 |
JP2543270B2 true JP2543270B2 (en) | 1996-10-16 |
Family
ID=15203371
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3137640A Expired - Lifetime JP2543270B2 (en) | 1991-05-31 | 1991-06-10 | Arc welding machine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2543270B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004082163A (en) * | 2002-08-27 | 2004-03-18 | Sansha Electric Mfg Co Ltd | Welding method and electric power unit for welding |
CN100339173C (en) * | 2004-02-13 | 2007-09-26 | 株式会社三社电机制作所 | Welding process and welding electric power unit |
-
1991
- 1991-06-10 JP JP3137640A patent/JP2543270B2/en not_active Expired - Lifetime
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004082163A (en) * | 2002-08-27 | 2004-03-18 | Sansha Electric Mfg Co Ltd | Welding method and electric power unit for welding |
US6992264B2 (en) | 2002-08-27 | 2006-01-31 | Sansha Electric Manufacturing Company, Limited | Welding method and welding power supply apparatus |
JP4643113B2 (en) * | 2002-08-27 | 2011-03-02 | 株式会社三社電機製作所 | Welding method and power supply device for welding |
CN100339173C (en) * | 2004-02-13 | 2007-09-26 | 株式会社三社电机制作所 | Welding process and welding electric power unit |
Also Published As
Publication number | Publication date |
---|---|
JPH04361873A (en) | 1992-12-15 |
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