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公开(公告)号：US20240399487A1
公开(公告)日：2024-12-05
申请号：US18675674
申请日：2024-05-28
Applicant: OSAKA UNIVERSITY , DAIHEN CORPORATION
Inventor： Hidetoshi Fujii , Yoshiaki Morisada , Takumi Aibara , Takaaki Miyauchi
Abstract: A resistance spot joining method includes: a protrusion forming step of forming a protrusion on at least one of a first workpiece and a second workpiece by pressing the first and second workpieces with a first load by a pressing shaft and a pressing member; a load reducing step of reducing an area of contact between the first and second workpieces by reducing a pressing force from the pressing shaft and the pressing member such that a second load is applied to the first and second workpieces; a current applying step of applying a current to the first and second workpieces; and a joining step of joining contact interfaces of the first and second workpiece to each other by pressing the first and second workpieces with a third load.
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公开(公告)号：US11130194B2
公开(公告)日：2021-09-28
申请号：US16324110
申请日：2017-08-04
Applicant: OSAKA UNIVERSITY , TOSHIBA MATERIALS CO., LTD.
Inventor： Hidetoshi Fujii , Yoshiaki Morisada , Kai Funaki , Isao Ikeda , Yutaka Abe , Masahiro Kato
IPC: B23K20/00 , B23K20/12 , C04B35/584 , C04B37/02
Abstract: The friction stir welding tool member according to the present invention is made of a ceramic member in which a shoulder portion and a probe portion are integrally formed, wherein a root portion of the probe portion and an end portion of the shoulder portion have a curved surface shape; and the friction stir welding tool member has a ratio (R1/D) of 0.02 or more and 0.20 or less when a curvature radius of the end portion of the shoulder portion is defined as R1 (mm) and an outer diameter of the shoulder portion is defined as D (mm). In addition, the ceramic member is preferably made of a silicon nitride sintered body having a Vickers hardness of 1400 HV1 or more. According to the above-described configuration, a friction stir welding tool member having excellent durability can be provided.
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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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公开(公告)号：US20240399490A1
公开(公告)日：2024-12-05
申请号：US18676449
申请日：2024-05-28
Applicant: OSAKA UNIVERSITY , DAIHEN CORPORATION
Inventor： Hidetoshi Fujii , Yoshiaki Morisada , Takumi Aibara , Takaaki Miyauchi
Abstract: A solid state welding apparatus comprises a pair of compression bars, a pair of electrodes disposed around the pair of compression bars, respectively, and a controller. The controller passes a first current through the pair of electrodes while controlling the pair of compression bars to cause a first load to act on each of first and second workpieces to bring the workpieces into contact with each other, and subsequently passes a second current larger than the first current through the pair of electrodes while controlling the pair of compression bars to cause a second load to act on each of first and second workpieces.
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Patent Agency Ranking
公开(公告)号：US11813693B2
公开(公告)日：2023-11-14
申请号：US17230358
申请日：2021-04-14
Applicant: OSAKA UNIVERSITY , TOSHIBA MATERIALS CO., LTD.
Inventor： Hidetoshi Fujii , Yoshiaki Morisada , Kai Funaki , Masahiro Kato , Takayuki Fukasawa , Yutaka Abe
CPC classification number: B23K20/1255
Abstract: A friction stir welding tool member according to the present embodiment has a shoulder portion and a probe portion concentrically projecting from an upper surface of the shoulder portion. The shoulder portion includes a curved surface processed portion that is curved to have a curved shape on an outer peripheral edge of the shoulder portion. A space occupancy occupied by the two-dimensional space in which neither the shoulder portion nor the probe portion exists is in a range of 30% to 70%, the space occupancy being determined based on a projection drawing of a side surface region surrounded from a tip of the probe portion to the curved surface processed portion of the shoulder portion.
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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：US20210229210A1
公开(公告)日：2021-07-29
申请号：US17230358
申请日：2021-04-14
Applicant: OSAKA UNIVERSITY , TOSHIBA MATERIALS CO., LTD.
Inventor： Hidetoshi Fujll , Yoshiaki Morisada , Kai Funakl , Masahiro Kato , Takayuki Fukasawa , Yutaka Abe
IPC: B23K20/12
Abstract: A friction stir welding tool member according to the present embodiment has a shoulder portion and a probe portion concentrically projecting from an upper surface of the shoulder portion. The shoulder portion includes a curved surface processed portion that is curved to have a curved shape on an outer peripheral edge of the shoulder portion. A space occupancy occupied by the two-dimensional space in which neither the shoulder portion nor the probe portion exists is in a range of 30% to 70%, the space occupancy being determined based on a projection drawing of a side surface region surrounded from a tip of the probe portion to the curved surface processed portion of the shoulder portion.
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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：US12234535B2
公开(公告)日：2025-02-25
申请号：US17435875
申请日：2020-02-20
Applicant: OSAKA UNIVERSITY
Inventor： Hidetoshi Fujii , Kohsaku Ushioda , Tomoya Nagira , Yoshiaki Morisada
Abstract: The present invention provides a weathering steel for solid-state welding that forms an excellent weld when subjected to solid-state welding and has tensile properties equivalent or superior to those of high tensile strength steel, said steel having weathering properties superior to those of conventional weathering steel for welding, wherein the reliability of the weld is equivalent or superior to that of the parent material; and a weathering steel material for solid-state welding. Further, there is provided a solid-state welded structure that includes the weathering steel for solid-state welding according to the present invention, and a solid-state welding method for said weathering steel for solid-state welding. The weathering steel for solid-state welding having a steel composition comprises, in % by mass, C: 0.10 to 0.60% and P: more than 0.035 to 1.000%, with the remainder consisting of Fe and unavoidable impurities.
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