JP2747375B2 - Resistance welding equipment - Google Patents
Resistance welding equipmentInfo
- Publication number
- JP2747375B2 JP2747375B2 JP3039746A JP3974691A JP2747375B2 JP 2747375 B2 JP2747375 B2 JP 2747375B2 JP 3039746 A JP3039746 A JP 3039746A JP 3974691 A JP3974691 A JP 3974691A JP 2747375 B2 JP2747375 B2 JP 2747375B2
- Authority
- JP
- Japan
- Prior art keywords
- welding
- electrode
- resistance
- voltmeter
- welded
- 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
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- Resistance Welding (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、被溶接材の電気抵抗
による発熱を利用して溶接を行う抵抗溶接装置に関し、
特に電極表面状態を自動的に監視し、電極成形処理等を
行なうことができる抵抗溶接装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resistance welding apparatus for performing welding by utilizing heat generated by electric resistance of a material to be welded.
In particular, the present invention relates to a resistance welding apparatus capable of automatically monitoring an electrode surface state and performing an electrode forming process or the like.
【０００２】[0002]
【従来の技術】図５は、従来の抵抗溶接装置を示す構成
図である。図５において、(1a),(1b)は溶接される被溶
接材、(2a),(2b) は夫々被溶接材を加圧保持する上部電
極及び下部電極、(7) は上部電極及び下部電極(2a),(2
b) に溶接電力を供給する溶接電源、(8a),(8b) は上記
上部電極及び下部電極(2a),(2b) を成形するためのドレ
ッサ、(9a),(9b) はドレッサ(8a),(8b) を夫々上部電極
及び下部電極(2a),(2b) に押しつけるためのアクチュエ
ータである。2. Description of the Related Art FIG. 5 is a configuration diagram showing a conventional resistance welding apparatus. In FIG. 5, (1a) and (1b) are the materials to be welded, (2a) and (2b) are the upper and lower electrodes for holding the material to be pressed, respectively, and (7) is the upper and lower electrodes. Electrodes (2a), (2
b) is a welding power supply that supplies welding power, (8a) and (8b) are dressers for forming the upper and lower electrodes (2a) and (2b), and (9a) and (9b) are dressers (8a ) And (8b) are pressed against the upper and lower electrodes (2a) and (2b), respectively.
【０００３】次に動作について説明する。上部電極及び
下部電極(2a),(2b) により加圧保持された一対の被溶接
材(1a),(1b) に対して、溶接電源(7) により溶接電流を
流し、被溶接材(1a),(1b) の電気抵抗による発熱を利用
して溶接を行う。そして、この溶接動作終了後に、アク
チュエータ(9a),(9b) によりドレッサ(8a),(8b) を上部
電極及び下部電極(2a),(2b) に一定圧力にて、一定時間
押しつけ成形する。Next, the operation will be described. A welding current is applied by a welding power source (7) to the pair of workpieces (1a) and (1b) held under pressure by the upper and lower electrodes (2a) and (2b), and the workpiece (1a Welding is performed using the heat generated by the electric resistance in (1) and (1b). After the welding operation is completed, the dressers (8a) and (8b) are pressed against the upper electrode and the lower electrodes (2a) and (2b) by the actuators (9a) and (9b) at a constant pressure for a fixed time.
【０００４】[0004]
【発明が解決しようとする課題】従来の抵抗溶接装置は
以上のように構成されているので、電極表面状態の如何
に拘らず溶接終了後に電極成形を必ず行なわなければな
らず、溶接中の電極表面状態に適応した電極成形を行な
うことが不可能であり、溶接品質が安定しないという問
題点があつた。Since the conventional resistance welding apparatus is constructed as described above, the electrode must be formed after the welding is completed regardless of the surface condition of the electrode. It is impossible to perform electrode forming adapted to the surface condition, and there is a problem that the welding quality is not stable.
【０００５】この発明は上記のような問題点を解決する
ためになされたもので、溶接品質に大きな影響を及ぼす
溶接中の電極表面状態を監視し、その状態に適応した電
極成形ができる抵抗溶接装置を得ることを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a resistance welding capable of monitoring an electrode surface condition during welding, which greatly affects welding quality, and forming an electrode in accordance with the condition. The aim is to obtain a device.
【０００６】[0006]
【課題を解決するための手段】請求項１の発明に係る抵
抗溶接装置は、被溶接材の電気抵抗による発熱を利用し
て溶接を行う抵抗溶接装置において、溶接回路に直列に
設けられ、溶接電流を検出する電流計と、上記溶接回路
に並列に設けられ、上部電極及び下部電極間の電圧を検
出する第１の電圧計と、上記溶接回路に並列に設けら
れ、上記上部電極及び下部電極間に加圧保持された複数
の被溶接材間の電圧を検出する第２の電圧計と、 上記
電流計の出力と上記第１および第２の電圧計の出力に基
づいて上記上部電極及び下部電極と上記被溶接材との間
の接触抵抗を計測する計測手段と、上記接触抵抗の計測
値から電極表面状態を判定し、電極成形装置等を制御す
る制御手段とを備えたものである。請求項２の発明に係
る抵抗溶接装置は、被溶接材の電気抵抗による発熱を利
用して溶接を行う抵抗溶接装置において、溶接回路に直
列に設けられ、溶接電流を検出する電流計と、上記溶接
回路に並列に設けられ、上部電極及び下部電極間に加圧
保持された複数の被溶接材の一方と上記上部電極との間
の電圧を検出する第１の電圧計と、上記溶接回路に並列
に設けられ、上記複数の被溶接材の他方と上記下部電極
との間の電圧を検出する第２の電圧計と、上記電流計の
出力と上記第１および第２の電圧計の出力に基づいて上
記上部電極及び下部電極と上記被溶接材との間の接触抵
抗を計測する計測手段と、上記接触抵抗の計測値から電
極表面状態を判定し、電極成形装置等を制御する制御手
段とを備えたものである。According to a first aspect of the present invention, there is provided a resistance welding apparatus for performing welding by utilizing heat generated by electric resistance of a material to be welded. An ammeter for detecting a current, a first voltmeter provided in parallel with the welding circuit for detecting a voltage between an upper electrode and a lower electrode, and a first voltmeter provided in parallel with the welding circuit; A second voltmeter for detecting a voltage between the plurality of workpieces held between them under pressure, the upper electrode and the lower electrode based on the output of the ammeter and the outputs of the first and second voltmeters It is provided with a measuring means for measuring a contact resistance between the electrode and the material to be welded, and a control means for judging an electrode surface state from the measured value of the contact resistance and controlling an electrode forming apparatus and the like. A resistance welding apparatus according to a second aspect of the present invention is a resistance welding apparatus for performing welding using heat generated by electric resistance of a material to be welded, wherein the ammeter is provided in series with a welding circuit and detects a welding current; A first voltmeter that is provided in parallel with the welding circuit and detects a voltage between one of the plurality of materials to be welded held between the upper electrode and the lower electrode and the upper electrode; A second voltmeter that is provided in parallel and detects a voltage between the other of the plurality of workpieces and the lower electrode; and outputs the output of the ammeter and the outputs of the first and second voltmeters. A measuring means for measuring a contact resistance between the upper electrode and the lower electrode and the material to be welded, and a control means for judging an electrode surface state from the measured value of the contact resistance and controlling an electrode forming apparatus and the like. It is provided with.
【０００７】[0007]
【作 用】この発明においては、上部電極及び下部電極
と被溶接材との間の接触抵抗値から電極表面状態を監視
しながら、その電極表面状態に適応した電極成形を行な
うことにより、抵抗溶接における理想的な入熱バランス
を維持し安定した抵抗溶接が可能となる。In the present invention, resistance welding is performed by monitoring the surface condition of the electrode from the contact resistance values between the upper and lower electrodes and the material to be welded, and forming the electrode in accordance with the surface condition of the electrode. In this case, the ideal heat input balance can be maintained and stable resistance welding can be performed.
【０００８】[0008]
【実施例】以下、この発明の一実施例を図について説明
する。図１はこの発明の一実施例を示す構成図である。
図１において、(1a),(1b),(2a),(2b),(7),(8a),(8b),(9
a),(9b) は前記従来装置と同様のものである。(3) は上
部電極(2a)及び下部電極(2b)間の電圧Ｖ2 を計測するた
めの第１の電圧計としての電圧計、(4) は被溶接材(1a)
及び(1b)間の電圧Ｖ1 を計測するための第２の電圧計と
しての電圧計、(5)は溶接電流Iを計測するための電流
計、(6) はＡ／Ｄ変換器、Ｄ／Ａ変換器、記憶装置及び
マイクロコンピュータ（いずれも図示せず）等から構成
される計測手段、制御手段としてのコントローラであ
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing one embodiment of the present invention.
In FIG. 1, (1a), (1b), (2a), (2b), (7), (8a), (8b), (9
(a) and (9b) are the same as those in the conventional device. (3) the upper electrode (2a) and the lower electrode voltmeter as a first voltmeter for measuring the voltage V 2 between (2b), (4) the workpieces (1a)
And a second voltmeter for measuring the voltage V 1 of the between (1b)
Voltmeter , (5) ammeter for measuring the welding current I, (6) A / D converter, D / A converter, storage device and microcomputer (all not shown), etc. And a controller as control means.
【０００９】次にこの発明の一実施例の動作を図２を参
照しながら説明する。図２は、コントローラ(6) のマイ
クロコンピュータ内で実行される処理手段の一例を示し
たフローチャートである。まず、溶接動作がスタートす
ると、ステップ(10)において電流計測(5) 、電圧計(3),
(4) により、それぞれ溶接電流I、上部ー下部電極間電
圧Ｖ1 、被溶接材間電圧Ｖ2 が計測され、コントローラ
(6) に送られる。次にコントローラ(6) ではこれらの計
測値からステップ(11)において電極ー被溶接材間の接触
抵抗Ｒを下記の(1) 式により算出する。（但し、本実施
例の場合、上部電極(2a)及び下部電極(2b)の接触抵抗が
等しいと仮定している。）◎ Ｒ ＝ （Ｖ1 − Ｖ2） ／ ２I ・・・(1) 次に、ステップ(12)においてあらかじめ各主被溶接材、
電極材料、溶接条件に対し実測あるいは数値計算により
求められた、理想的に入熱バランスを維持することがで
きる接触抵抗の最大値Ｒ0 と上述べの如く算出した接触
抵抗Ｒとを比較する。そして、ＲがＲ0 よりも大きい場
合には、電極の表面状態が悪化していると判断し、ステ
ップ(13)に移行し、アクチュエータ(9a),(9b) により、
ドレッサ(8a),(8b) を上部電極及び下部電極(2a),(2b)
に押しつけて、一定時間電極成形動作を行う。上記のス
テップ(10)〜(13)の動作は、ステップ(14)において、溶
接終了が確認されるまで繰り返し実行される。また、ス
テップ(12)において、ＲがＲ0 より小さい場合にはステ
ップ(14)に進み、ここで溶接動作が終了したか否かを判
断し、終了していなければステップ(10)に戻って上述の
動作を繰り返えし、終了していれば一連の動作を終了す
る。Next, the operation of one embodiment of the present invention will be described with reference to FIG. FIG. 2 is a flowchart showing an example of processing means executed in the microcomputer of the controller (6). First, when the welding operation starts, in step (10), the current measurement (5), the voltmeter (3),
According to (4), the welding current I, the voltage V 1 between the upper and lower electrodes, and the voltage V 2 between the materials to be welded are measured, and the controller
Sent to (6). Next, the controller (6) calculates the contact resistance R between the electrode and the workpiece in accordance with the following equation (1) in step (11) from these measured values. (However, in the case of this embodiment, it is assumed that the contact resistances of the upper electrode (2a) and the lower electrode (2b) are equal.) R = (V 1 −V 2 ) / 2I (1) Next, in step (12), each main welded material is
The maximum value R 0 of the contact resistance that can maintain the ideal heat input balance, obtained by actual measurement or numerical calculation with respect to the electrode material and welding conditions, is compared with the contact resistance R calculated as described above. When R is larger than R 0, it is determined that the surface condition of the electrode is degraded, and the process proceeds to step (13), where the actuators (9a) and (9b)
The dressers (8a) and (8b) are connected to the upper and lower electrodes (2a) and (2b).
To perform an electrode forming operation for a certain period of time. The operations of the above steps (10) to (13) are repeatedly executed in step (14) until the end of welding is confirmed. In step (12), if R is smaller than R0 , the process proceeds to step (14), where it is determined whether the welding operation has been completed. If not, the process returns to step (10). The above operation is repeated, and if completed, a series of operations is completed.
【００１０】図３はこの発明の他の実施例を示す構成図
である。図３において、図１と対応する部分には同一を
付し、その詳細説明は省略する。本実施例では上記実施
例で用いたドレッサ(8a),(8b) の代りに切削バイト(16
a),(16b) を用いる。また、上記実施例では電極及び被
溶接材間の接触抵抗を間接的に求めたが、本実施例では
直接求める。そのために第１の電圧計としての電圧計(1
7)を上部電極(2a)への電源ラインと被溶接材(1a)との間
に接続し、第２の電圧計としての電圧計(18)を下部電極
(2b)への電源ラインと被溶接材(1b)との間に接続する。FIG. 3 is a block diagram showing another embodiment of the present invention. 3, parts corresponding to those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted. In this embodiment, a cutting tool (16) is used instead of the dressers (8a) and (8b) used in the above embodiment.
a) and (16b) are used. In the above embodiment, the contact resistance between the electrode and the material to be welded is obtained indirectly, but in this embodiment, it is obtained directly. Voltmeter as a first voltmeter Therefore (1
7) is connected between the power supply line to the upper electrode (2a) and the workpiece (1a), and the voltmeter (18) as the second voltmeter is connected to the lower electrode.
It is connected between the power supply line to (2b) and the material to be welded (1b).
【００１１】次にこの発明の他の実施例の動作を図４を
参照しながら説明する。まず、溶接動作がスタートする
と、ステップ(19)において電流計(5) 、電圧計(17),(1
8) により、それぞれ溶接電流I、上部電極−被溶接材間
電圧Ｖ3 、下部電極−被溶接材間電圧Ｖ4 が計測され、
コントローラ(6) に送られる。次にコントローラ(6)で
はこれらの計測値からステップ(20)において上部電極−
被溶接材間の接触抵抗Ｒ3 及び下部電極−被溶接材間の
接触抵抗Ｒ4 を下記の(2) 式及び(3) 式により算出す
る。 Ｒ3 ＝ Ｖ3 ／ I ・・・(2) Ｒ4 ＝ Ｖ4 ／ I ・・・(3) 次に、ステップ(21)において、上記接触抵抗の最大値Ｒ
0 と上述の如く算出した接触抵抗Ｒ3 とを比較する。そ
して、Ｒ3 がＲ0 よりも大きい場合には電極の表面状態
が悪化していると判断し、ステップ(22)に移行し、アク
チュエータ(9a)により切削バイト(16a) を上部電極(2a)
に接触させて、一定時間電極成形動作を行う。また、ス
テップ(21)において、Ｒ3 がＲ0 より小さい場合或いは
上部電極成形動作と並行してステップ(23)において、上
記接触抵抗の最大値Ｒ0 と上述の如く算出した接触抵抗
Ｒ4 とを比較する。そして、Ｒ4 がＲ0 より大きい場合
には電極の表面状態が悪化していると判断し、ステップ
(24)に移行し、アクチュエータ(9b)より切削バイト(16
b) を下部(2b)に接触させて、一定時間電極成形動作を
行う。上記のステップ(19)〜(24)の動作は、ステップ(1
4)において、溶接終了が確認されるまで繰り返し実行さ
れる。また、ステップ(23)において、Ｒ4 がＲ0 より小
さい場合にはステップ(14)に進み、ここで溶接動作が終
了したか否かを判断し、終了していなければステップ(1
9)に戻って上述の動作を繰り返えし、終了していれば一
連の動作を終了する。このように本実施例では上部電極
及び下部電極の形成を独立に行うことにより、上記実施
例より電極の表面状態に対応した電極成形加工が可能と
なり、成形精度を向上できる。なお、上記実施例では、
シーム溶接機の場合について説明したが、他の抵抗溶接
装置であってもよく、上記実施例と同様の効果を奏す
る。Next, the operation of another embodiment of the present invention will be described with reference to FIG. First, when the welding operation starts, in step (19), the ammeter (5), the voltmeter (17), (1
8), the welding current I, the voltage V 3 between the upper electrode and the material to be welded, and the voltage V 4 between the lower electrode and the material to be welded are measured, respectively.
Sent to controller (6). Next, in step (20), the controller (6) calculates the upper electrode
Contact resistance R 3 and the lower electrode between the workpieces - calculated by the contact resistance R 4 of the following formula (2) and (3) between the workpieces. R 3 = V 3 / I (2) R 4 = V 4 / I (3) Next, in step (21), the maximum value R of the contact resistance is obtained.
0 is compared with the contact resistance R 3 calculated as described above. If R 3 is larger than R 0, it is determined that the surface condition of the electrode has deteriorated, and the process proceeds to step (22), in which the cutting tool (16a) is moved to the upper electrode (2a) by the actuator (9a).
To perform an electrode forming operation for a certain period of time. Also, in step (21), when R 3 is smaller than R 0 or in parallel with the upper electrode forming operation , in step (23), the maximum value R 0 of the contact resistance and the contact resistance R 4 calculated as described above are used. Compare. If R 4 is larger than R 0, it is determined that the surface condition of the electrode has deteriorated,
Move to (24) and cut the cutting tool (16
b) is brought into contact with the lower part (2b), and the electrode forming operation is performed for a certain time. The operations in steps (19) to (24) are performed in step (1).
In 4), the process is repeatedly executed until the end of welding is confirmed. Further, in step (23), the flow advances to step (14) if R 4 is R 0 is less than, where it is determined whether the welding operation has been completed, step If not completed (1
Returning to 9), the above operation is repeated, and if completed, a series of operations is completed. As described above, in the present embodiment, by independently forming the upper electrode and the lower electrode, it is possible to perform an electrode forming process corresponding to the surface state of the electrode as compared with the above-described embodiment, thereby improving the forming accuracy. In the above embodiment,
Although the case of the seam welding machine has been described, other resistance welding devices may be used, and the same effects as in the above-described embodiment can be obtained.
【００１２】[0012]
【発明の効果】以上のように、この発明によれば、被溶
接材の電気抵抗による発熱を利用して溶接を行う抵抗溶
接装置において、溶接回路に直列に設けられ、溶接電流
を検出する電流計と、上記溶接回路に並列に設けられ、
上部電極及び下部電極間の電圧を検出する第１の電圧計
と、上記溶接回路に並列に設けられ、上記上部電極及び
下部電極間に加圧保持された複数の被溶接材間の電圧を
検出する第２の電圧計と、上記電流計の出力と上記第１
および第２の電圧計の出力に基づいて上記上部電極及び
下部電極と上記被溶接材との間の接触抵抗を計測する計
測手段と、上記接触抵抗の計測値から電極表面状態を判
定し、電極成形装置等を制御する制御手段とを備えたも
のであり、また、被溶接材の電気抵抗による発熱を利用
して溶接を行う抵抗溶接装置において、溶接回路に直列
に設けられ、溶接電流を検出する電流計と、上記溶接回
路に並列に設けられ、上部電極及び下部電極間に加圧保
持された複数の被溶接材の一方と上記上部電極との間の
電圧を検出する第１の電圧計と、上記溶接回路に並列に
設けられ、上記複数の被溶接材の他方と上記下部電極と
の間の電圧を検出する第２の電圧計と、上記電流計の出
力と上記第１および第２の電圧計の出力に基づいて上記
上部電極及び下部電極と上記被溶接材との間の接触抵抗
を計測する計測手段と、上記接触抵抗の計測値から電極
表面状態を判定し、電極成形装置等を制御する制御手段
とを備えたので、安定した溶接品質が確保でき、特に被
溶接材間の接触抵抗とそのバルク抵抗が計測値に介入す
ることがないので、電極表面状態以外の要因例えば溶接
状態、被溶接材の材質、板厚等の変化の影響を何等受け
ることなく上部電極及び下部電極と被溶接材との間の接
触抵抗値のみを確実に計測でき、以て、精度の高い電極
表面状態の監視が可能となり、その電極表面状態に適応
した電極成形を行なうことにより、抵抗溶接における理
想的な入熱バランスを維持し安定した抵抗溶接ができる
効果がある。As described above, according to the present invention, in a resistance welding apparatus for performing welding by utilizing heat generated by electric resistance of a material to be welded, a current is provided in series with a welding circuit and detects a welding current. Meter, and provided in parallel with the welding circuit,
A first voltmeter for detecting a voltage between the upper electrode and the lower electrode, and a voltage between a plurality of workpieces provided in parallel with the welding circuit and held under pressure between the upper and lower electrodes. The second voltmeter, the output of the ammeter and the first
And measuring means for measuring the contact resistance between the upper electrode and the lower electrode and the workpiece based on the output of the second voltmeter, and determining the electrode surface state from the measured value of the contact resistance, And a control means for controlling a forming apparatus and the like, and a resistance welding apparatus for performing welding by utilizing heat generated by electric resistance of a material to be welded, which is provided in series with a welding circuit to detect a welding current. a current meter for, provided in parallel to the welding circuit, the first voltage meter for detecting a voltage between one and the upper electrode of the plurality of workpieces that are pressure held between the upper and lower electrodes A second voltmeter that is provided in parallel with the welding circuit and detects a voltage between the other of the plurality of workpieces and the lower electrode; and an output of the ammeter and the first and second voltmeters. The upper and lower electrodes based on the output of the voltmeter Measuring means for measuring the contact resistance between the pole and the material to be welded, and a control means for determining the electrode surface state from the measured value of the contact resistance and controlling the electrode forming apparatus, etc. Since the welding quality can be ensured, and especially the contact resistance between the materials to be welded and the bulk resistance do not intervene in the measured values, factors other than the electrode surface condition, such as changes in the welding condition, material to be welded, plate thickness, etc. It is possible to reliably measure only the contact resistance between the upper and lower electrodes and the material to be welded without being affected by any of the above conditions. By performing the appropriate electrode forming, there is an effect that an ideal heat input balance in resistance welding is maintained and stable resistance welding can be performed.
【図１】この発明の一実施例を示す構成図である。FIG. 1 is a configuration diagram showing one embodiment of the present invention.
【図２】図１の動作説明に供するためのフローチャート
である。FIG. 2 is a flowchart for explaining the operation of FIG. 1;
【図３】この発明の他の実施例を示す構成図である。FIG. 3 is a configuration diagram showing another embodiment of the present invention.
【図４】図３の動作説明に供するためのフローチャート
である。FIG. 4 is a flowchart for explaining the operation of FIG. 3;
【図５】従来の抵抗溶接装置を示す構成図である。FIG. 5 is a configuration diagram showing a conventional resistance welding apparatus.
1a,1b 被溶接材 2a 上部電極 2b 下部電極 ３，４,17,18 電圧計 ５ 電流計 ６ コントローラ ７ 溶接電源 8a,8b ドレッサ 9a,9b アクチュエータ 16a,16b 切削バイト 1a, 1b Workpiece 2a Upper electrode 2b Lower electrode 3,4,17,18 Voltmeter 5 Ammeter 6 Controller 7 Welding power supply 8a, 8b Dresser 9a, 9b Actuator 16a, 16b Cutting tool
Claims (2)
て溶接を行う抵抗溶接装置において、 溶接回路に直列に設けられ、溶接電流を検出する電流計
と、 上記溶接回路に並列に設けられ、上部電極及び下部電極
間の電圧を検出する第１の電圧計と、 上記溶接回路に並列に設けられ、上記上部電極及び下部
電極間に加圧保持された複数の被溶接材間の電圧を検出
する第２の電圧計と、 上記電流計の出力と上記第１および第２の電圧計の出力
に基づいて上記上部電極及び下部電極と上記被溶接材と
の間の接触抵抗を計測する計測手段と、 上記接触抵抗の計測値から電極表面状態を判定し、電極
成形装置等を制御する制御手段とを備えたことを特徴と
する抵抗溶接装置。1. A resistance welding apparatus for performing welding by utilizing heat generated by electric resistance of a material to be welded, wherein the resistance welding apparatus is provided in series with a welding circuit, and is provided in parallel with the welding circuit for detecting a welding current. A first voltmeter for detecting a voltage between the upper electrode and the lower electrode; and a voltage between a plurality of workpieces provided in parallel with the welding circuit and pressed and held between the upper electrode and the lower electrode. A second voltmeter to be detected; and a measurement for measuring a contact resistance between the upper electrode and the lower electrode and the workpiece based on an output of the ammeter and outputs of the first and second voltmeters. And a control means for determining an electrode surface state from the measured value of the contact resistance and controlling an electrode forming apparatus and the like.
て溶接を行う抵抗溶接装置において、 溶接回路に直列に設けられ、溶接電流を検出する電流計
と、 上記溶接回路に並列に設けられ、上部電極及び下部電極
間に加圧保持された複数の被溶接材の一方と上記上部電
極との間の電圧を検出する第１の電圧計と、 上記溶接回路に並列に設けられ、上記複数の被溶接材の
他方と上記下部電極との間の電圧を検出する第２の電圧
計と、 上記電流計の出力と上記第１および第２の電圧計の出力
に基づいて上記上部電極及び下部電極と上記被溶接材と
の間の接触抵抗を計測する計測手段と、 上記接触抵抗の計測値から電極表面状態を判定し、電極
成形装置等を制御する制御手段とを備えたことを特徴と
する抵抗溶接装置。2. A resistance welding apparatus for performing welding by utilizing heat generated by electric resistance of a material to be welded, wherein the resistance welding apparatus is provided in series with a welding circuit, and is provided in parallel with the welding circuit for detecting a welding current. A first voltmeter for detecting a voltage between one of the plurality of workpieces held between the upper electrode and the lower electrode and the upper electrode, and a first voltmeter provided in parallel with the welding circuit; A second voltmeter for detecting a voltage between the other of the workpieces and the lower electrode; an upper electrode and a lower electrode based on an output of the ammeter and outputs of the first and second voltmeters. Measuring means for measuring the contact resistance between the electrode and the material to be welded; and control means for determining an electrode surface state from the measured value of the contact resistance and controlling an electrode forming apparatus and the like. Resistance welding equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3039746A JP2747375B2 (en) | 1991-03-06 | 1991-03-06 | Resistance welding equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3039746A JP2747375B2 (en) | 1991-03-06 | 1991-03-06 | Resistance welding equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04279287A JPH04279287A (en) | 1992-10-05 |
| JP2747375B2 true JP2747375B2 (en) | 1998-05-06 |
Family
ID=12561530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3039746A Expired - Lifetime JP2747375B2 (en) | 1991-03-06 | 1991-03-06 | Resistance welding equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2747375B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100958038B1 (en) * | 2009-09-10 | 2010-05-17 | 모니텍주식회사 | A weld testing apparatus |
| JP6236610B2 (en) * | 2014-08-20 | 2017-11-29 | 国立大学法人東北大学 | Contact dimension measuring method between steel plates and contact dimension measuring apparatus between steel plates |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5570484A (en) * | 1978-11-22 | 1980-05-27 | Hitachi Ltd | Supervising method for electrode wastage of large current short time current supply resistance welding machine |
| JPS57202988A (en) * | 1981-06-10 | 1982-12-13 | Nippon Abionikusu Kk | Accommodation controlling device for resistance welding |
| JPH01215475A (en) * | 1988-02-25 | 1989-08-29 | Mitsubishi Motors Corp | Method for monitoring abnormality of spot welding electrode |
-
1991
- 1991-03-06 JP JP3039746A patent/JP2747375B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04279287A (en) | 1992-10-05 |
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