FRICTION WELDING MATERIAL OBTAINED FROM DUCTILE CAST IRON AND PRODUCTION METHOD THEREFOR

Japanese Patent JP3971220

B2

PROBLEM TO BE SOLVED: To provide a joint with mechanical properties equal to or more excellent than those of original metals by friction welding of ductile cast iron.
SOLUTION: The joint is obtained by applying friction welding to the ductile cast iron materials either or both of which contain 0.0005 to 0.05% Bi, and, more desirably, contain 0.0001 to 0.05% Ca and the joint maintains mechanical properties equal to or above those of the original base metals even without undergoing heat treatment after welding. The number of graphite grains to be crystallized extremely increases, and extremely fine graphite is dispersedly crystallized onto a dense base. Further, it is estimated that the exhaust of graphite in the process of the welding is efficiently performed as well, and the induction of the improvement of strength after the welding is sufficiently expected. In a high temperature state, Ca and Bi form an intermetallic compound to check the wear of Bi due to vaporization, and the original action of Bi is secured, so that its mechanical properties, particularly, elongation can further be improved.

JPH07100668	OBJECT TO BE WORKED TRANSFER DEVICE FOR FRICTION WELDING MACHINE
WO/2005/094541	SOLID STATE PROCESSING OF MATERIALS THROUGH FRICTION STIR PROCESSING AND FRICTION STIR MIXING
WO/2002/092273	FSW TOOL

Keiichi Maekawa
Yoshisada Michiura
Makoto Kitagawa
Wataru Kogen
Horie Akira

JP2002086889A

September 05, 2007

March 26, 2002

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Kurimoto Iron Works Co., Ltd.
Horie Akira

B23K20/12; C22C37/04; B23K103/06; (IPC1-7): C22C37/04; //B23K20/12; B23K103:06

JP2001276983A
JP10317093A
JP5171342A
JP10193142A
JP63260689A
JP2070015A
JP6093369A

Bunji Kamada
Torii Kazuhisa
Takayoshi Tagawa
Higashio Masahiro

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