SUBMERGED ARC WELDING METHOD WITH MULTIPLE ELECTRODES FOR STEEL MATERIAL

Title:

SUBMERGED ARC WELDING METHOD WITH MULTIPLE ELECTRODES FOR STEEL MATERIAL

Document Type and Number:

WIPO Patent Application WO/2009/104806

Kind Code:

A1

Abstract:

Provided is a submerged arc welding method with multiple electrodes for a steel material suitable for use in welding for manufacturing a large-diameter steel pipe such as a UOE steel pipe, a spiral steel pipe, or the like the base material thickness of which is between 10 mm and 50 mm. Specifically, when the steel material is submerged arc welded with multiple electrodes of three or more electrodes, a direct-current power source is used for feeding power to a first electrode. The welding by the first electrode is performed at a current density of 250 A/mm2 or higher, preferably a wire diameter of 3.2 mm, and a welding current of 1000 A or higher, and the welding by a second electrode is at a current density of 150 A/mm2 or higher and preferably a welding current of 600 A or higher, wherein one distance between the electrodes is 23 mm or more at the steel material surface position, and the other distances between the electrodes are 20 mm or less.

Inventors:

ISHIGAMI ATSUSHI (JP)
OI KENJI (JP)
HAYAKAWA NAOYA (JP)

Application Number:

PCT/JP2009/053472

Publication Date:

August 27, 2009

Filing Date:

February 19, 2009

Export Citation:

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Assignee:

JFE STEEL CORP (JP)
ISHIGAMI ATSUSHI (JP)
OI KENJI (JP)
HAYAKAWA NAOYA (JP)

International Classes:

B23K9/18; B23K9/00; B23K9/025; B23K9/032; B23K101/06

Foreign References:

JP2007260684A	2007-10-11
JP2007268564A	2007-10-18
JPH11138266A	1999-05-25
JPH10109171A	1998-04-28
JPS5282652A	1977-07-11
JPS5832583A	1983-02-25
JP2006272377A	2006-10-12

Other References: