公开(公告)号：WO1988000105A1

公开(公告)日：1988-01-14

申请号：PCT/JP1987000481

申请日：1987-07-07

Applicant: N.P.W TECHNICAL LABORATORY CO. ,  SHINKO ELECTRIC CO., LTD. ,  KAWANO, Hitoshi ,  HAYASHI, Mitsuhiro ,  YAMAMOTO, Yukio ,  BAN, Kunikatsu

Inventor： N.P.W TECHNICAL LABORATORY CO. ,  SHINKO ELECTRIC CO., LTD.

IPC: B23K11/24

CPC classification number: B23K11/309 ,  B23K11/063 ,  B23K2101/12

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).