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1. (WO2017154658) METHOD FOR LOW-TEMPERATURE JOINING OF METAL MATERIALS, AND JOINT STRUCTURE

Pub. No.:    WO/2017/154658    International Application No.:    PCT/JP2017/007677
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Wed Mar 01 00:59:59 CET 2017
IPC: B23K 20/12
Applicants: OSAKA UNIVERSTIY
国立大学法人大阪大学
Inventors: FUJII Hidetoshi
藤井 英俊
UEJI Rintaro
上路 林太郎
MORISADA Yoshiaki
森貞 好昭
Title: METHOD FOR LOW-TEMPERATURE JOINING OF METAL MATERIALS, AND JOINT STRUCTURE
Abstract:
[Problem] To provide: an easy-to-use low-temperature joining method with which it is possible to effectively suppress reductions in the mechanical properties of a junction of various types of high-tensile steel or aluminum, and of a heat-affected zone; and a joint structure obtained from the low-temperature joining method. [Solution] A method for joining two metal materials by forming a joint interface in which the two metal materials face each other at a joint and press-fitting to the joint a rotation tool caused to rotate at a prescribed speed, the method for low-temperature joining of metal materials characterized in that the peripheral velocity of the outermost periphery of the rotation tool is set to 51 mm/s or less, whereby the re-crystallization temperature inherent to the metal materials is reduced by introducing a large strain to the joint, and recrystallized grains are generated at the joint interface by setting the joining temperature to less than the re-crystallization temperature inherent to the metal materials.