Method for manufacturing spiral-welded steel pipe

Details Method for manufacturing spiral-welded steel pipe Method for manufacturing spiral-welded steel pipe

1985-09-30

1987-02-24

Goldberg, E. A.

Electric heating

Metal heating

Of cylinders

219 67, B23K 1106

Patent

active

046458930

ABSTRACT:
In the manufacture of spiral-welded steel pipe, material strip or plate is fed in its longitudinal direction and continuously formed into spiral pipe form. One side-edge of the strip and the other side-edge of the strip that has already been spirally formed are welded together by the electric-resistance method where they meet. The edges of the strip and formed pipe are held together simultaneously with or immediately after the electric-resistance welding from both inside and outside the pipe using a pair of pressure rolls. The bead formed as a result of the electric-resistance welding is reformed simultaneously with or immediately after the holding by the pressure rolls is accomplished. Then, the electric-resistance welded side-ends are welded again by the arc method.

REFERENCES:
patent: 2265943 (1941-12-01), Laig
patent: 3178550 (1965-04-01), Eggert, Jr.
patent: 3697718 (1972-10-01), Von Hollen et al.
Cary, Howard B., Modern Welding Techology, 1979, p. 539.

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