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EP0261328A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Seam welder

Assignee: Shinko Electric Co Ltd
•
Filing: 1987-07-03
•
Granted: —
•
Expires: 2007-07-03
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Abstract

Abstract A seam welder, in which wire electrodes are inserted between upper (1) and lower (2) roller electrodes disposed in an face-to-face relation to each other, a metal plate or a covered metal plate is guided as a base material (4) between the two wires, and said base material is welded by heating and fusing it by causing current through it while pressing it between said upper (1) and lower (2) roller electrodes, comprises: a rectifying circuit (11) for obtaining a DC voltage through full-wave rectification of a three-phase AC current source; a smoothing circuit (12) for smoothing said DC voltage so as to reduce pulsation included in said DC voltage; a converting circuit (13) for converting said smoothed voltage into a pulse voltage with the polarity thereof varied alternately; and a transformer (14) for applying a pulse voltage between said upper (1) and lower (2) roller electrodes; a capacitor (15) being inserted between the primary side of said transformer (14) and output side of said converting circuit (13). The adequate welding speed can be varied as desired in a wide range.

Inventors

  • 👤 Hitoshi Kawano
  • 👤 Mitsuhiro Hayashi
  • 👤 Yukio Yamamoto
  • 👤 Kunikatsu Ban

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-08 01:55
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/08; B23K11/24; B23K11/25; B23K11/252; B23K11/256; B23K11/06; B23K11/061; B23K11/062; B23K11/063; B23K11/257; B23K2101/00; B23K2101/04; B23K2101/12; B23K2101/125

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 169 words
A seam welder, in which wire electrodes are inserted between upper (1) and lower (2) roller electrodes disposed in an face-to-face relation to each other, a metal plate or a covered metal plate is guided as a base material (4) between the two wires, and sa id base material is welded by heating and fusing it by causing current through it while pressing it between said upper (1) and lower (2) roller electrodes, comprising: a rectifying circuit (11) for obtaining a DC voltage through full-wave rectification of a three-phase AC current source; a smoothing circuit (12) for smoothing said DC voltage so as to reduce pulsation included in said DC voltage; a converting circuit (13) for converting said smoothed voltage into a pulse voltage with the polarity thereof varied alternately; and a transformer (14) for applying a pulse voltage between said upper (1) and lower (2) roller electrodes; a capacitor (15) being inserted between the primary side of said transformer (14) and output side of said converting circuit (13).
Claim 2
Dependent Claim 169 words
A seam welder, in which wire electrodes are inserted between upper (1) and lower (2) roller electrodes disposed in an face-to-face relation to each other, a metal plate or a covered metal plate is guided as a base material (4) between the two wires, and sa id base material is welded by heating and fusing it by causing current through it while pressing it between said upper (1) and lower (2) roller electrodes, comprising: a rectifying circuit (11) for obtaining a DC voltage through full-wave rectification of a three-phase AC current source; a smoothing circuit (12) for smoothing said DC voltage so as to reduce pulsation included in said DC voltage; a converting circuit (13) for converting said smoothed voltage into a pulse voltage with the polarity thereof varied alternately; and a transformer (14) for applying a pulse voltage between said upper (1) and lower (2) roller electrodes; a capacitor (15) being inserted between the primary side of said transformer (14) and output side of said converting circuit (13).
Claim 3
Dependent Claim 59 words
A seam welder as set forth in claim 1, wherein a compensating circuit (17) is provided, in which the output current detected on the output side of said converting circuit (13) is compared to a reference, and a signal corresponding to an increment is supplied to said converting circuit (13) to hold said output current at a reference value.
Claim 4
Dependent Claim 29 words
A seam welder according to claim 1, wherein a frequency varying device (18) is provided for varying the frequency of a pulse voltage provided from said converting circuit (13).

References Cited (Backward Citations)

GB1158682A Cited
US4447699A Cited

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