Title:
FRICTION WELDING STRUCTURE OF HIGH-STRENGTH BOLT AND STEEL MATERIAL THEREFOR
Document Type and Number:
WIPO Patent Application WO/1996/024730
Kind Code:
A1
Abstract:
The ratio of the hardness of the surface layer of one of a plurality of steel materials constituting a friction welding surface to the hardness of the surface layer of the other steel material is equal to or more than 2.5. The surface layer having a higher hardness has a depth equal to or more than 0.2 mm. On the surface layer having a higher hardness are provided a plurality of projections having heights of 0.2 to 1.0 mm and having triangular wave shapes or pyramidal shapes, ensuring a slip factor equal to or more than 0.9, improving the friction surfaces in quality, enhancing the joining performance, making the friction welded portions compact, improving the workability and attaining cost reduction of the work.
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Inventors:
UNO NOBUYOSHI (JP)
SHIMURA YASUMI (JP)
SHIMURA YASUMI (JP)
Application Number:
PCT/JP1996/000250
Publication Date:
August 15, 1996
Filing Date:
February 06, 1996
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
UNO NOBUYOSHI (JP)
SHIMURA YASUMI (JP)
UNO NOBUYOSHI (JP)
SHIMURA YASUMI (JP)
International Classes:
E04B1/38; B23K20/12; E04B1/24; E04B1/58; F16B5/02; (IPC1-7): E04B1/38
Foreign References:
| JPH06330567A | 1994-11-29 | |||
| JPS5152628A | 1976-05-10 | |||
| JPH01266309A | 1989-10-24 | |||
| JPH06272323A | 1994-09-27 |
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