Title:
ELECTRIC RESISTANCE WELDING EQUIPMENT IN SPIRAL STEEL TUBE
Document Type and Number:
Japanese Patent JP2510058
Kind Code:
B2
Abstract:
PURPOSE: To obviate a flashing phenomenon at the time of electric resistance weeding, and to decrease a welding defect by enlarging an apex angle by pushing up a coil edge of a spiral steel tube side.
CONSTITUTION: When a distance between one coil edge of a steel belt coil 8 and the other coil edge of a spiral steel tube 1 opposed thereto, a distance to a welding point 6 therefrom, and an angle (apex angle) consisting of the welding point 6 and both the coil edges are denoted as C, L, and θ, respectively, θderived by the expression is adjusted so as to become a wider angle than before. The apex angle is enlarged by using a pipe holding-don roll, and by pushing up locally the coil edge on the side of the spiral steel tube 1 from downward immediately before welding.
Inventors:
MASHIMA HIROYOSHI
MORI YASUNORI
TANAKA KAZUHIRO
KITAZATO TAKESHI
MORI YASUNORI
TANAKA KAZUHIRO
KITAZATO TAKESHI
Application Number:
JP23966492A
Publication Date:
June 26, 1996
Filing Date:
September 08, 1992
Export Citation:
Assignee:
SHINNIPPON SEITETSU KK
NITSUTETSU PURANTO SETSUKEI KK
NITSUTETSU PURANTO SETSUKEI KK
International Classes:
B21C37/12; B23K11/00; B23K11/08; B23K13/04; (IPC1-7): B23K11/08; B21C37/12; B23K11/00; B23K13/04
Attorney, Agent or Firm:
Tomoyuki Yathata (1 outside)