Title:
JOINT MEMBER, WELDED JOINT, METHOD FOR MANUFACTURING WELDED JOINT, AND METHOD FOR MANUFACTURING JOINT MEMBER
Document Type and Number:
Japanese Patent JP2021171774
Kind Code:
A
Abstract:
To provide a joint member which enables joining of high-strength steel materials by friction welding, a welded joint of a high-strength steel material obtained by friction welding, and a method for manufacturing them.SOLUTION: A joint member that joins a first steel material and a second steel material superposed on the first steel material and is made of steel includes a shaft part, and a head part that is provided at a first end of the shaft part and overhangs outside outer periphery of the shaft part in plan view vertical to an axial direction of the shaft part. A diameter of the shaft part is 2.5-10.0 mm, the shaft part has a pointed end provided at a second end of the shaft part, the pointed end is composed of an oblique surface forming an angle to the axial line of 45-75° in a plane including the axial line of the shaft part, Vickers hardness at a depth of 1.25 mm from the surface of the shaft part is 180-550 HV, and Vickers hardness at a depth of 0.05 mm from the surface of the shaft part is 600 HV or harder.SELECTED DRAWING: Figure 1
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Inventors:
UMEHARA MIYURI
MATSUI SHO
YOSHINAGA CHISATO
MATSUI SHO
YOSHINAGA CHISATO
Application Number:
JP2020075271A
Publication Date:
November 01, 2021
Filing Date:
April 21, 2020
Export Citation:
Assignee:
NIPPON STEEL CORP
International Classes:
C22C38/00; B23K20/12; C22C38/38
Attorney, Agent or Firm:
Sumio Tanai
Mitsuo Teramoto
Tomoo Katsumata
Hiroshi Yamaguchi
Mitsuo Teramoto
Tomoo Katsumata
Hiroshi Yamaguchi