Method of making a steel pipe by electric resistance heating of

Details Method of making a steel pipe by electric resistance heating of Method of making a steel pipe by electric resistance heating of

1995-07-31

1997-08-05

Evans, Geoffrey S.

Electric heating

Metal heating

By arc

B23K 2600

Patent

active

056538995

ABSTRACT:
A method for manufacturing a laser-welded steel pipe, comprising: (a) providing a hot-rolled steel sheet consisting essentially of 0.005 to 0.2 wt. % C, 0.1 to 0.35 wt. % Si, 0.5 to 2 wt. % Mn, 0.01 wt. % or less P, 0.003 wt. % or less S, 0.001 to 0.1 wt. % Nb, 0.001 to 0.006 wt. % Ca and the balance being Fe; (b) continuously forming an open pipe by passing the hot-rolled steel sheet through multi-stage forming rolls, the open pipe having opposed edge faces which confront each other; (c) heating the opposed edge faces of the open pipe by electric resistance heating; and (d) pressure-welding the heated opposed edge faces together by projecting a laser beam in a substantially vertical direction onto an edge joining point of the opposed edge faces and squeezing the opposed edge faces together by passing the open pipe through opposing rolls, to control an upset, the upset being a difference between a coil width (mm) of the open pipe and a circumferential length of the pipe formed after welding (mm).

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Patent Abstracts of Japan, vol. 17, No. 298 (M-1425), 8 Jun. 1993 of JP-A-05 023867 (Nippon Steel) 2 Feb. 1993.
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