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公开(公告)号：US20220371120A1
公开(公告)日：2022-11-24
申请号：US17775421
申请日：2020-10-28
Applicant: OSAKA UNIVERSITY
Inventor： Hidetoshi Fujii , Yoshiaki Morisada , Yasuhiro Aoki , Masayoshi Kamai
IPC: B23K20/16 , B23K20/12 , B23K20/227
Abstract: A dissimilar material solid phase bonding method is disclosed wherein one member and another member having different compositions are brought into contact with one another by way of an insert material to form an interface (1) to be bonded, at which the one member and the insert material are in contact with one another, and an interface (2) to be bonded, at which the other member and the insert material are in contact with one another; the temperature of the interface (1) to be bonded and the interface (2) to be bonded is raised by means of frictional heat and/or by electrical heating; a bonding pressure (1) is applied substantially perpendicular to the interface (1) to be bonded; a bonding pressure (2) is applied substantially perpendicular to the interface (2) to be bonded; and the bonding pressure (1) and the bonding pressure (2) are set to different values.
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公开(公告)号：US20200023458A1
公开(公告)日：2020-01-23
申请号：US16494916
申请日：2018-03-09
Applicant: OSAKA UNIVERSITY
Inventor： Hidetoshi Fujii , Yoshiaki Morisada , Yasuhiro Aoki
IPC: B23K20/12
Abstract: The present invention provides a friction welding method capable of reducing the welding temperature and a friction welding method capable of obtaining a welded portion free of defects regardless the type of material. A frictional welding method in which one member is brought into contact with the other member and slides while a load is applied substantially perpendicularly to the interface to be welded, the frictional welding method comprising: a first step in which frictional welding is carried out by setting a pressure calculated from the area and the load of the interface to be welded to be equal to or higher than the yield stress and the tensile strength of one member and/or the other member at a desired welding temperature; and a second step in which frictional welding is carried out by lowering the load, wherein the first step and the second step are continuously carried out.
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公开(公告)号：US11273518B2
公开(公告)日：2022-03-15
申请号：US16479043
申请日：2018-02-01
Applicant: OSAKA UNIVERSITY
Inventor： Hidetoshi Fujii , Yoshiaki Morisada , Yasuhiro Aoki , Masanori Yasuyama , Gen Murayama
IPC: B23K20/00 , B23K20/12 , B23K31/12 , B23K103/14 , B23K103/02 , B23K20/22
Abstract: A linear friction welding method capable of accurately controlling a welding temperature and capable of lowering the welding temperature is provided. The present invention is a linear friction welding method comprising: a first step of forming a welded interface by bringing one member into contact with the other member; a second step of repeatedly sliding one member and the other member on the same locus and discharging flash from the welded interface in a state where pressure is applied substantially perpendicularly to the welded interface; and a third step of forming a welded surface by stopping the sliding and setting the pressure to be not less than the yield stress and not more than the tensile strength of one member and/or the other member at a desired welding temperature.
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公开(公告)号：US20210220942A1
公开(公告)日：2021-07-22
申请号：US15734338
申请日：2019-05-28
Applicant: OSAKA UNIVERSITY
Inventor： Hidetoshi Fujii , Yoshiaki Morisada , Yasuhiro Aoki , Akihiko Ikuta
IPC: B23K20/12
Abstract: Provided are a long-life and inexpensive friction stir welding tool that is not dependent on the mode of friction stir welding or the type of material to be welded, and a friction stir welding method using the friction stir welding tool. The friction stir welding tool comprises a body portion having a shoulder portion, and a probe portion disposed on a bottom surface of the body portion, and is characterized in that the probe portion is spherical-crown shaped. Preferably, the shoulder portion is flat or convex, and preferably the hardness of the shoulder portion is greater than the hardness of the probe portion.
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公开(公告)号：US20210129263A1
公开(公告)日：2021-05-06
申请号：US16479043
申请日：2018-02-01
Applicant: OSAKA UNIVERSITY
Inventor： Hidetoshi Fujii , Yoshiaki Morisada , Yasuhiro Aoki , Masanori Yasuyama , Gen Murayama
Abstract: A linear friction welding method capable of accurately controlling a welding temperature and capable of lowering the welding temperature is provided. The present invention is a linear friction welding method comprising: a first step of forming a welded interface by bringing one member into contact with the other member; a second step of repeatedly sliding one member and the other member on the same locus and discharging flash from the welded interface in a state where pressure is applied substantially perpendicularly to the welded interface; and a third step of forming a welded surface by stopping the sliding and setting the pressure to be not less than the yield stress and not more than the tensile strength of one member and/or the other member at a desired welding temperature.
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Patent Agency Ranking
公开(公告)号：US11872651B2
公开(公告)日：2024-01-16
申请号：US17775421
申请日：2020-10-28
Applicant: OSAKA UNIVERSITY
Inventor： Hidetoshi Fujii , Yoshiaki Morisada , Yasuhiro Aoki , Masayoshi Kamai
IPC: B23K20/00 , B23K20/16 , B23K20/12 , B23K20/227 , B23K103/20
CPC classification number: B23K20/16 , B23K20/1205 , B23K20/2275 , B23K2103/20
Abstract: A dissimilar material solid phase bonding method is disclosed wherein one member and another member having different compositions are brought into contact with one another by way of an insert material to form an interface (1) to be bonded, at which the one member and the insert material are in contact with one another, and an interface (2) to be bonded, at which the other member and the insert material are in contact with one another; the temperature of the interface (1) to be bonded and the interface (2) to be bonded is raised by means of frictional heat and/or by electrical heating; a bonding pressure (1) is applied substantially perpendicular to the interface (1) to be bonded; a bonding pressure (2) is applied substantially perpendicular to the interface (2) to be bonded; and the bonding pressure (1) and the bonding pressure (2) are set to different values.
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公开(公告)号：US11745287B2
公开(公告)日：2023-09-05
申请号：US16981001
申请日：2019-02-22
Applicant: OSAKA UNIVERSITY
Inventor： Hidetoshi Fujii , Yoshiaki Morisada , Huihong Liu , Yasuhiro Aoki , Masayoshi Kamai
IPC: B23K20/00 , B23K20/02 , B23K103/04
CPC classification number: B23K20/023 , B23K2103/04
Abstract: To provide a solid phase welding method and a solid phase welding apparatus which are possible to accurately control the welding temperature, to lower the welding temperature and to achieve a solid phase welding of the metallic materials. The present invention provides a solid phase welding method for metallic materials comprising, a first step of forming an interface to be welded by abutting end portions of one material to be welded and the other material to be welded and applying a pressure in a direction substantially perpendicular to the interface to be welded, a second step of raising a temperature of the vicinity of the interface to be welded to a welding temperature by an external heating means, wherein the pressure is set to equal to or more than the yield strength of the one material to be welded and/or the other material to be welded at the welding temperature.
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公开(公告)号：US11534854B2
公开(公告)日：2022-12-27
申请号：US15734338
申请日：2019-05-28
Applicant: OSAKA UNIVERSITY
Inventor： Hidetoshi Fujii , Yoshiaki Morisada , Yasuhiro Aoki , Akihiko Ikuta
IPC: B23K20/00 , B23K20/12 , B23K103/14 , B23K103/02
Abstract: Provided are a long-life and inexpensive friction stir welding tool that is not dependent on the mode of friction stir welding or the type of material to be welded, and a friction stir welding method using the friction stir welding tool. The friction stir welding tool comprises a body portion having a shoulder portion, and a probe portion disposed on a bottom surface of the body portion, and is characterized in that the probe portion is spherical-crown shaped. Preferably, the shoulder portion is flat or convex, and preferably the hardness of the shoulder portion is greater than the hardness of the probe portion.
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公开(公告)号：US20220162723A1
公开(公告)日：2022-05-26
申请号：US17441569
申请日：2020-03-02
Applicant: OSAKA UNIVERSITY
Inventor： Hidetoshi Fujii , Yoshiaki Morisada , Yasuhiro Aoki
Abstract: Provided are an effective and simple surface-modifying method for prolonging the life of a steel structure made of a steel material having a high sulfur (S) content, and a steel structure having a life prolonged by the surface-modifying method. A surface-modifying method for forming a friction stir region on the surface of a steel material by friction stir processing, wherein a sulfur (S) content of the steel material is 200 ppm or more.
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公开(公告)号：US11110542B2
公开(公告)日：2021-09-07
申请号：US16494916
申请日：2018-03-09
Applicant: OSAKA UNIVERSITY
Inventor： Hidetoshi Fujii , Yoshiaki Morisada , Yasuhiro Aoki
IPC: B23K20/00 , B23K20/12 , B23K101/20 , B23K103/04
Abstract: The present invention provides a friction welding method capable of reducing the welding temperature and a friction welding method capable of obtaining a welded portion free of defects regardless the type of material. A frictional welding method in which one member is brought into contact with the other member and slides while a load is applied substantially perpendicularly to the interface to be welded, the frictional welding method comprising: a first step in which frictional welding is carried out by setting a pressure calculated from the area and the load of the interface to be welded to be equal to or higher than the yield stress and the tensile strength of one member and/or the other member at a desired welding temperature; and a second step in which frictional welding is carried out by lowering the load, wherein the first step and the second step are continuously carried out.
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