Title:
LASER-WELDED STEEL STRUCTURAL MEMBER AND STEEL MATERIAL USED IN ITS STEEL STRUCTURAL MEMBER
Document Type and Number:
Japanese Patent JP3705171
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a steel structural member having a laser welding part excellent in fatigue strength property and steel material used in its steel structural member.
SOLUTION: In this laser-welded steel structural member, the value of weighted average of welding metal side vicat hardness in the region where the distance from the bonded part after laser welding is within 1.6 mm on the position of 1 mm depth from the surface of base material is ≤1.6 times of the value of weighted average of welding heat affecting part side vicat hardness in the region where the distance is within 1.6 mm. Therein, the value of weighted average of the vicat hardness in the region where the distance from the bonded part is within 1.6 mm denotes the value calculated by the following expression when the test is performed with a test force of ≤9.807N; 0.4×HV10.4+0.3×HV10.8+0.2×HV11.2+0.1×HV11.6, therein, the Vickers hardness on the position where the distance from the bonded part is L mm is HV1L.
Inventors:
Noboru Honda
Kamo Arichi
Tomoya Fujiwara
Ichiro Seta
Tomoya Kawabata
Kamo Arichi
Tomoya Fujiwara
Ichiro Seta
Tomoya Kawabata
Application Number:
JP2001246496A
Publication Date:
October 12, 2005
Filing Date:
August 15, 2001
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
B23K26/32; C22C38/00; C22C38/06; C22C38/50; B23K103/04; (IPC1-7): B23K26/32; C22C38/00; C22C38/06; C22C38/50
Domestic Patent References:
| JP9201688A | ||||
| JP11104838A | ||||
| JP7100643A | ||||
| JP7171679A | ||||
| JP8155658A | ||||
| JP8309428A | ||||
| JP7126807A |
Attorney, Agent or Firm:
Mikiji Sugioka
Michio Mori
Terutada Hogami
Michio Mori
Terutada Hogami