OVERLAP LASER WELDING METHOD - NIPPON STEEL CORP

Title:

OVERLAP LASER WELDING METHOD

Document Type and Number:

Japanese Patent JP2007229752

Kind Code:

A

Abstract:

To prevent solidification cracking in overlap laser welding.

In the laser welding method where a plurality of steel materials in which at least one is made of high tensile strength steel are overlapped, as laser light is emitted to the vicinities of the edge parts of the overlapped sheet materials from the overlapped direction in such a manner that melting is caused to the back face of the sheet material on the lower side to be overlapped, the laser light is moved along the edge parts, so as to form a weld zone in which the content of carbon in the weld metal satisfies 0.05≤C≤0.08%; thus the overlapped sheet materials are welded each other, the width of the overlapped parts in the sheet materials is controlled to ≤8 mm, and also, the weld zone is formed at a position far by ≥3.5 mm from the edges of the sheet materials.

Inventors:

SAIDA KENJI
MIYAZAKI YASUNOBU
INOUE HIROSHIGE
FUJIKAWA YOSHIHIRO
NAKANO SHIRO
IWASE MAKOTO

Application Number:

JP2006053136A

Publication Date:

September 13, 2007

Filing Date:

February 28, 2006

Export Citation:

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Assignee:

NIPPON STEEL CORP
TOYOTA MOTOR CORP

International Classes:

B23K26/21; B23K26/32

Domestic Patent References:

JP2002079388A	2002-03-19
JPH1094890A	1998-04-14
JPH09164425A	1997-06-24
JP2002079387A	2002-03-19
JP2002180181A	2002-06-26
JP2006007237A	2006-01-12
JPH06170568A	1994-06-21

Attorney, Agent or Firm:

Atsushi Aoki
Takashi Ishida
Tetsuji Koga
Hiroshi Kamematsu
Nakamura Asayuki

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