METHOD FOR PRODUCING LASER-WELDED STEEL TUBE

Title:

METHOD FOR PRODUCING LASER-WELDED STEEL TUBE

Document Type and Number:

WIPO Patent Application WO/2012/132023

Kind Code:

A1

Abstract:

In this method for producing a laser-welded steel tube by forming a steel plate into a tubular open pipe by means of a forming roll and then laser welding the edge section of the open pipe by radiating a laser beam while applying pressure to the edge section using a squeeze roll, welding is performed with two laser beams each transmitted using a different fiber and having a correctly focused spot diameter of over 0.3 mm being radiated from the top surface side of the open pipe along the edge section, a preceding laser beam that precedes in the direction of welding progress at the top surface side of the open pipe and a subsequent laser beam that is subsequent being provided with an angle of incidence from the perpendicular direction to the top surface of the open pipe, radiating while tilted in the direction of welding progress, the angle of incidence of the preceding laser beam being caused to be greater than that of the subsequent laser beam, and the gap between the center point of the preceding laser beam and the center point of the subsequent laser beam at the rear surface of the open pipe being at least 1 mm.

Inventors:

YANO KOJI (JP)
SUMI HIROYUKI (JP)
OI KENJI (JP)

Application Number:

PCT/JP2011/060804

Publication Date:

October 04, 2012

Filing Date:

April 28, 2011

Export Citation:

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Assignee:

JFE STEEL CORP (JP)
YANO KOJI (JP)
SUMI HIROYUKI (JP)
OI KENJI (JP)

International Classes:

B23K26/00; B21C37/08; B23K26/064; B23K26/067; B23K26/21

Foreign References:

JPS59101293A	1984-06-11
JPH0199789A	1989-04-18
JPH07144288A	1995-06-06
JPH0890265A	1996-04-09
JPH08155665A	1996-06-18
JPH0924480A	1997-01-28
JP2009178768A	2009-08-13
JP2009269036A	2009-11-19
JP2010167436A	2010-08-05
JP2010240734A	2010-10-28
JP2902550B2	1999-06-07
JP2004330299A	2004-11-25
JP4120408B2	2008-07-16
JP2009178768A	2009-08-13

Other References: