Title:
ELECTRIC RESISTANCE WELDING METHOD FOR SPIRAL STEEL PIPE
Document Type and Number:
Japanese Patent JP2515470
Kind Code:
B2
Abstract:
PURPOSE: To eliminate the generation of flashing and improve the welding quality by pushing down the steel strip side coil edge, maintaining an angle shown by the formula above the specified angle and performing welding on the position right before welding in electric resistance welding of the spiral steel pipe.
CONSTITUTION: A steel strip 1 is wound spirally, the steel strip side coil edge and the steel pipe side coil edge are pressed to perform electric resistance welding and the spiral steel pipe 1 is produced. The angle θ shown by the formula I is maintained at ≥5° to perform welding by using a pipe press roll 9 and a roll 10. Consequently, the generation of flashing at the time of electric resistance welding which has been generated due to the fact that it has been performed at a narrow angle while depending on forming of the spiral steel pipe on an apex angle in the part is eliminated, weld defects are greatly reduced and the welding efficiency and welding quality can be improved.
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Inventors:
MASHIMA HIROYOSHI
MORI YASUNORI
KAKITA KAZUTOSHI
MORI YASUNORI
KAKITA KAZUTOSHI
Application Number:
JP23966692A
Publication Date:
July 10, 1996
Filing Date:
September 08, 1992
Export Citation:
Assignee:
SHINNIPPON SEITETSU KK
International Classes:
B21C37/12; B23K13/04; (IPC1-7): B23K13/04; B21C37/12
Attorney, Agent or Firm:
Tomoyuki Yathata (1 outside)