JPH0436789B2 - - Google Patents
Info
- Publication number
- JPH0436789B2 JPH0436789B2 JP59045032A JP4503284A JPH0436789B2 JP H0436789 B2 JPH0436789 B2 JP H0436789B2 JP 59045032 A JP59045032 A JP 59045032A JP 4503284 A JP4503284 A JP 4503284A JP H0436789 B2 JPH0436789 B2 JP H0436789B2
- Authority
- JP
- Japan
- Prior art keywords
- welding
- voltage
- base material
- current
- power source
- 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
- 238000003466 welding Methods 0.000 claims description 53
- 238000001514 detection method Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000005611 electricity Effects 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
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】
この発明は、溶接母材の表面に酸化被膜が形成
されたものでも溶接可能な溶接装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding device capable of welding even a weld base material with an oxide film formed on its surface.
従来の点溶接装置においては、溶接母材の表面
が酸化していると、その酸化被膜の抵抗により溶
接困難な場合が多かつた。そのため、例えばアル
ミ溶接において、表面にアルマイト処理されたも
のは通常絶縁性が高いので、溶接前に溶接部分の
酸化被膜を取り除く作業が必要であり、非常に面
倒であつた。 In conventional spot welding equipment, if the surface of the base material to be welded is oxidized, welding is often difficult due to the resistance of the oxide film. For this reason, for example, in aluminum welding, since materials whose surfaces are alumite-treated usually have high insulation properties, it is necessary to remove the oxide film from the welding area before welding, which is extremely troublesome.
この発明の目的は、上記従来の溶接装置の欠点
を解消し、表面に酸化被膜が形成された溶接母材
であつても、溶接を安易になし得る溶接装置を提
供することである。 An object of the present invention is to provide a welding apparatus that eliminates the drawbacks of the conventional welding apparatuses described above and can easily weld even a welding base material having an oxide film formed on its surface.
上記目的を達成するために、この発明の溶接装
置は、動作当初に溶接母材に高電圧を印加して酸
化被膜の絶縁を破り、その後従来の溶接装置程度
の電圧を印加して通常の溶接動作をなすという２
段階の電圧印加を行うようにしている。すなわち
この発明の溶接装置は、比較的高い直流電圧を出
力する第１の電源と、この第１の電源よりも低い
直流電圧を出力する第２の電源と、当初は前記第
１の電源よりの直流高電圧を溶接母材に印加さ
せ、切替により前記第２の電源よりの直流電圧を
溶接母材に印加させる切替回路と、前記第１の電
源による溶接母材への直流高電圧印加で前記溶接
母材に電流が流れると、この電流を検出し、前記
切替回路に切替信号を入力する電流検出回路とか
ら構成されている。 In order to achieve the above object, the welding device of the present invention applies a high voltage to the welding base material at the beginning of operation to break the insulation of the oxide film, and then applies a voltage similar to that of conventional welding devices to perform normal welding. 2 to perform an action
The voltage is applied in stages. That is, the welding device of the present invention includes a first power source that outputs a relatively high DC voltage, a second power source that outputs a DC voltage lower than the first power source, and a welding device that is initially connected to the first power source. a switching circuit for applying a DC high voltage to the welding base material and applying the DC voltage from the second power source to the welding base material by switching; and applying the DC high voltage to the welding base material by the first power source; It is comprised of a current detection circuit that detects this current when it flows through the welding base material and inputs a switching signal to the switching circuit.
以下、実施例により、この発明をさらに詳細に
説明する。 Hereinafter, the present invention will be explained in more detail with reference to Examples.
第１図は、この発明の１実施例を示す溶接装置
の回路である。同図において、１は比較的高い直
流電圧Ｅ１を出力する電源回路、２は直流電圧Ｅ
１よりも低い直流電圧Ｅ２を出力する電源回路で
ある。この電源回路２は、従来の溶接装置にも備
えられていたものである。３は切替制御回路であ
つて、この回路の制御作用により、電源回路１の
直流電圧Ｅ１と電源回路２の直流電圧Ｅ２が切替
出力されるようになつている。 FIG. 1 is a circuit diagram of a welding device showing one embodiment of the present invention. In the figure, 1 is a power supply circuit that outputs a relatively high DC voltage E1, and 2 is a DC voltage E1.
This is a power supply circuit that outputs a DC voltage E2 lower than 1. This power supply circuit 2 is also provided in conventional welding equipment. Reference numeral 3 denotes a switching control circuit, and by the control action of this circuit, the DC voltage E1 of the power supply circuit 1 and the DC voltage E2 of the power supply circuit 2 are switched and output.
４ａ，４ｂは溶接母材であり、これら溶接母材
４ａ，４ｂ間には、直流電圧Ｅ１あるいは直流電
圧Ｅ２が印加されるようになつている。５は溶接
母材４ａ、４ｂに流れる電流を検出するための電
流検出回路である。 4a and 4b are welding base materials, and a DC voltage E1 or a DC voltage E2 is applied between these welding base materials 4a and 4b. 5 is a current detection circuit for detecting the current flowing through the welding base materials 4a and 4b.
電源回路１は、交流電源AS１、負荷制御用の
サイリスタTh１，Th２、トランスＴ１及び整流
用ダイオードＤ１，Ｄ２から構成されており、同
様に電源回路２は交流電源AS２、負荷制御用の
サイリスタTh３，Th４、トランスＴ２及び整流
用ダイオードＤ３、Ｄ４から構成されている。し
かし、これら電源回路１，２の内部構成はよく知
られたものである。 The power supply circuit 1 includes an AC power supply AS1, thyristors Th1 and Th2 for load control, a transformer T1, and rectifier diodes D1 and D2. Similarly, the power supply circuit 2 includes an AC power supply AS2, a thyristor Th3 for load control, It consists of Th4, transformer T2, and rectifying diodes D3 and D4. However, the internal configurations of these power supply circuits 1 and 2 are well known.
もつとも、Ｅ１＞Ｅ２となるように、トランス
Ｔ１の１次側、２次側の巻数をN1、N2とし、ト
ランスＴ２の１次側、２次側の巻数をN3、N4と
すると、両トランスＴ１，Ｔ２はN2／N1＞＞
N4／N3となるように設定されている。 However, if the number of turns on the primary and secondary sides of transformer T1 is N1 and N2 and the number of turns on the primary and secondary sides of transformer T2 is N3 and N4 so that E1>E2, both transformers T1 , T2 is N2/N1 >>
It is set to be N4/N3.
次に、以上のように構成される実施例装置の動
作を説明する。 Next, the operation of the embodiment apparatus configured as described above will be explained.
動作開始で、切替制御回路３はまず信号ａを電
源回路１に送り、サイリスタTh１、Th２を動作
させる。これにより、電源回路１から直流電圧Ｅ
１が出力され、この直流電圧Ｅ１が溶接母材４
ａ、４ｂ間に印加される。この直流電圧Ｅ１の波
型は、第２図のｔ−Ｅ（時間−電圧）特性に示す
通りである。溶接母材４ａ，４ｂの表面に酸化被
膜が形成されていると電流が流れにくいが、直流
電圧Ｅ１は高電位なので、印加の継続で酸化被膜
の絶縁が破れ、通電電流Ｉ１が流れる。第２図で
は、直流電圧Ｅ１の３個目の半サイクルで通電電
流Ｉ１が流れたことを示している。 At the start of operation, the switching control circuit 3 first sends a signal a to the power supply circuit 1 to operate the thyristors Th1 and Th2. As a result, the DC voltage E from the power supply circuit 1
1 is output, and this DC voltage E1 is applied to the welding base material 4.
It is applied between a and 4b. The waveform of this DC voltage E1 is as shown in the tE (time-voltage) characteristic in FIG. If an oxide film is formed on the surface of the welding base materials 4a, 4b, it is difficult for current to flow, but since the DC voltage E1 is at a high potential, the insulation of the oxide film is broken with continued application, and the current I1 flows. FIG. 2 shows that the energizing current I1 flows during the third half cycle of the DC voltage E1.
電流Ｉ１が流れると、電流検出回路５はこの電
流Ｉ１を検出し、切替制御回路３に切替信号ｃを
送る。これに応答して、切替制御回路３は信号ａ
に代えて信号ｂを出力し、この信号ｂを電源回路
２に加えてサイリスタTh３，Th４を動作させ
る。これにより電源回路２から直流電圧Ｅ２が出
力され、この直流電圧Ｅ２が溶接母材４ａ、４ｂ
間に印加され、通電電流Ｉ２が流れ（第２図参
照）、酸化被膜がない状態で、従来の溶接装置で
溶接をなすのと同様の溶接が行われる。 When current I1 flows, current detection circuit 5 detects this current I1 and sends switching signal c to switching control circuit 3. In response to this, the switching control circuit 3 outputs the signal a
Instead, a signal b is output, and this signal b is applied to the power supply circuit 2 to operate the thyristors Th3 and Th4. As a result, a DC voltage E2 is output from the power supply circuit 2, and this DC voltage E2 is applied to the welding base materials 4a and 4b.
An energizing current I2 is applied between them (see FIG. 2), and welding is performed in the same way as welding with conventional welding equipment without an oxide film.
なお、上記実施例において、サイリスタTh１，
Th２…Th４は通常のサイリスタを使用している
が、サイリスタTh１，Th２は通常のものに代え
て、ゲートターンオフサイリスタを用いてもよ
い。このようにすることにより、第３図に示す波
形の斜線部のみの通電が可能となり、電源回路１
による通電時のエネルギーが制御でき、この電源
回路による通電が絶縁破壊にのみ使用されること
になるので、その後の通常の溶接に影響を及ぼさ
ない通電をなすことができる。 In addition, in the above embodiment, the thyristors Th1,
Th2...Th4 use normal thyristors, but gate turn-off thyristors may be used instead of the normal thyristors Th1 and Th2. By doing this, it becomes possible to conduct electricity only to the shaded part of the waveform shown in FIG.
The energy during energization can be controlled, and the energization by this power supply circuit is used only for dielectric breakdown, so it is possible to energize without affecting subsequent normal welding.
この発明の溶接装置によれば、溶接母材に最初
高電位を印加し、絶縁破壊による電流検出で通常
の溶接電圧を印加し溶接を行うものであるから、
溶接母材の表面にたとえ酸化被膜等が形成されて
いても、これを苦にすることなく溶接をなすこと
ができる。また、溶接母材が表面にアルマイト処
理されたアルミ等であつても、溶接前に溶接部分
のアルマイト処理膜を取り除く作業を全く要する
ことなく溶接を行うことができる。 According to the welding device of the present invention, a high potential is first applied to the welding base material, and a normal welding voltage is applied by detecting current due to dielectric breakdown to perform welding.
Even if an oxide film or the like is formed on the surface of the welding base material, welding can be performed without any problems. Furthermore, even if the welding base material is aluminum or the like whose surface has been alumite-treated, welding can be performed without any work required to remove the alumite-treated film from the welding portion before welding.
第１図は、この発明の１実施例を示す溶接装置
の回路図、第２図は同溶接装置の動作を説明する
ための溶接母材への印加電圧及び通電電流の波形
図、第３図は、同溶接装置の高電圧発生用の電源
回路にゲートターンオフサイリスタを使用した場
合の印加電圧波形を示す図である。
１：高電圧用電源回路、２：低電圧用電源回
路、３：切替制御回路、４ａ，４ｂ：溶接母材、
５：電流検出回路。
Fig. 1 is a circuit diagram of a welding device showing one embodiment of the present invention, Fig. 2 is a waveform diagram of voltage applied to the welding base material and current applied to the welding base material to explain the operation of the welding device, Fig. 3 2 is a diagram showing an applied voltage waveform when a gate turn-off thyristor is used in the power supply circuit for high voltage generation of the welding apparatus. 1: High voltage power supply circuit, 2: Low voltage power supply circuit, 3: Switching control circuit, 4a, 4b: Welding base material,
5: Current detection circuit.
Claims (1)
と、この第１の電源よりも低い直流電圧を出力す
る第２の電源と、当初は前記第１の電源よりの直
流高電圧を溶接母材に印加させ、切替により前記
第２の電源よりの直流電圧を溶接母材に印加させ
る切替回路と、前記第１の電源による溶接母材へ
の直流高電圧印加で前記溶接母材に電流が流れる
と、この電流を検出し、前記切替回路に切替信号
を入力する電流検出回路を備え、前記切替後に低
電圧、大電流の直流溶接電流を通電して溶接を行
うことを特徴とする溶接装置。1 A first power source that outputs a relatively high DC voltage, a second power source that outputs a DC voltage lower than this first power source, and initially a high DC voltage from the first power source that is used to weld the base material. a switching circuit that applies a DC voltage from the second power source to the welding base material by switching, and a current flowing to the welding base material by applying a high DC voltage to the welding base material by the first power source. and a current detection circuit that detects this current and inputs a switching signal to the switching circuit, and after the switching, a low voltage, high current DC welding current is applied to perform welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4503284A JPS60187471A (en) | 1984-03-08 | 1984-03-08 | Welding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4503284A JPS60187471A (en) | 1984-03-08 | 1984-03-08 | Welding device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60187471A JPS60187471A (en) | 1985-09-24 |
| JPH0436789B2 true JPH0436789B2 (en) | 1992-06-17 |
Family
ID=12707996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4503284A Granted JPS60187471A (en) | 1984-03-08 | 1984-03-08 | Welding device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60187471A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5033371B2 (en) * | 2005-08-01 | 2012-09-26 | 本田技研工業株式会社 | Method and apparatus for manufacturing joined body |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5847581A (en) * | 1981-09-17 | 1983-03-19 | Dengensha Mfg Co Ltd | Spot welding method and controller for steel plates having insulating film |
-
1984
- 1984-03-08 JP JP4503284A patent/JPS60187471A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5847581A (en) * | 1981-09-17 | 1983-03-19 | Dengensha Mfg Co Ltd | Spot welding method and controller for steel plates having insulating film |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60187471A (en) | 1985-09-24 |
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