公开(公告)号：US4868364B1

公开(公告)日：1992-11-10

申请号：US7046887

申请日：1987-07-07

Applicant: SHINKO ELECTRIC CO LTD ,  NPW TECHNICAL LAB CO

Inventor： HITOSHI KAWANO ,  MITSUHIRO HAYASHI ,  YUKIO YAMAMOTO ,  KUNIKATSU BAN

IPC: B23K11/24 ,  B23K11/06 ,  B23K11/25

CPC classification number: B23K11/256 ,  B23K11/06 ,  B23K11/063 ,  B23K11/257 ,  B23K2201/125

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.

公开(公告)号：US4879445B1

公开(公告)日：1992-04-14

申请号：US18455188

申请日：1988-04-14

Applicant: NPW TECHNICAL LAB CO ,  SHINKO ELECTRIC CO LTD

Inventor： HITOSHI KAWANO ,  MITSUHIRO HAYASHI ,  YUKIO YAMAMOTO ,  KUNIKATSU BAN

IPC: B23K11/06 ,  B23K11/30

CPC classification number: B23K11/309 ,  B23K11/063 ,  B23K2201/12

Abstract: Seam welding appts. for welding by passing the overlap portion of metal sheets between electrode rolls (1,2) across which welding current from a power supply (8) is passed has a detector (6) which detects at least the leading edge of base material that is to be welded and is provided on a line joining the axes of rotation of the electrode rolls and a control circuit (7) which uses the output of this detector to calculate and control current supply start and stop times. Pref. the control circuit receives input from detectors including and approach switch (14) that detects the position of a slit (9) in a disk (13) in a metal rear end forwarding unit (10).