METHOD OF LIQUID-PHASE DIFFUSION JOINING FOR HIGH PROOF STRESS, HIGH-TOUGHNESS JOINT

Japanese Patent JP3629184

B2

PROBLEM TO BE SOLVED: To provide a method of joining for a liquid-phase diffusion joining joint, by which the toughness and the proof strength of a joint including the heat-affected zone of a metallic material are improved.
SOLUTION: In the method of the liquid-phase diffusion joining for the joint having the high proof strength and the high toughness one or more insert metals for the liquid-phase diffusion joining substantially 50% of which is amorphous is inserted between butts groove parts of materials to be joined, heated up to a temperature of the melting point of the inserted metal or higher, the materials to be joined are joined together by the liquid-phase diffusion joining by an isothermal solidification phenomenon based on a diffusion rate controlling of atoms, and the liquid-phase diffusion joining joint is formed. The subsequent cooling after the isothermal solidification of the liquid-phase diffusion joining joint is performed in a way that the cooling is so controlled that the cooling speed is equal to or higher than the value calculated by the following equation (1) expressed by major chemical components of the material to be joined, V(°C/S)=3/(9×%C+1.5×%Si+0.3×%Mn+2×%Cr+0.5×%Mo+4×%N) (1), until the temperature of the liquid-phase diffusion joining joint becomes 200°C or lower.

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Yasushi Hasegawa
Yasuhiro Shinohara
Eiji Tsuru
Yuichi Sato

JP2000145320A

March 16, 2005

May 17, 2000

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Nippon Steel Corporation

B23K20/00; B23K103/02; (IPC1-7): B23K20/00

JP5169280A
JP11285860A

Takashi Ishida
Jun Tsuruta
Masaya Nishiyama

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