公开(公告)号：US20240316689A1

公开(公告)日：2024-09-26

申请号：US18580395

申请日：2022-07-26

Applicant: OSAKA UNIVERSITY

Inventor： Hidetoshi FUJII ,  Huihong LIU ,  Yoshiaki MORISADA

IPC: B23K20/12 ,  B23K103/04 ,  B23K103/10 ,  B23K103/12

CPC classification number: B23K20/129 ,  B23K2103/04 ,  B23K2103/10 ,  B23K2103/12

Abstract: Provided are: a solid-state joining method with which it is possible to control the discharge direction of burrs and to realize sufficient joining strength; a solid-state joined joint and a solid-state joined structure that are obtained through the solid-state joining method; and a solid-state joining device that can be suitably used in the solid-state joining method. A solid-state joining method characterized by having a first step for bringing end parts of one material being joined and another material being joined into butting contact with one another and forming a joining interface, a second step for increasing the temperature in the vicinity of the joining interface by using an external heating means, and a third step for plastically deforming the joining interface to thereby discharge burrs and form a solid-state joined interface, the plate thickness of the end part of the one material being joined and/or the other material being joined is reduced, and the solid-state joining method having a gradient such that the plate thickness decreases on a side where discharge of the burrs is suppressed.

公开(公告)号：US20250153264A1

公开(公告)日：2025-05-15

申请号：US18835902

申请日：2023-02-07

Applicant: OSAKA UNIVERSITY

Inventor： Hidetoshi FUJII ,  Muneaki MUKUDA ,  Yoshiaki MORISADA

IPC: B23K20/12 ,  B23K103/10

Abstract: The present invention provides a simple and efficient friction stir welding method that, in addition to enabling localized friction stir welding, makes it possible to obtain a smooth friction stir surface and increase tool lifespan. This friction stir welding method is characterized in that the tip end of a tool that is rotated at a prescribed speed is pressed into a material to be welded, a stir portion is formed by moving the tool in an arbitrary welding direction, and the tool is slanted toward the retreating side relative to the welding direction.

公开(公告)号：US20230138076A1

公开(公告)日：2023-05-04

申请号：US17910588

申请日：2021-03-09

Applicant: OSAKA UNIVERSITY

Inventor： Hidetoshi FUJII ,  Yoshiaki MORISADA ,  Masayoshi KAMAI ,  Takumi AIBARA

IPC: B23K11/30 ,  B23K11/34 ,  B23K11/11

Abstract: The present invention provides: a solid-phase spot-welding method with which the welding temperature can be controlled accurately and with which a reduction in the welding temperature can be achieved, regardless of the type of metal material being welded; and a solid-phase spot-welding device that can be used suitably in this solid-phase spot-welding method. This solid-phase welding method involves overlapping metal plate materials and carrying out spot-welding, and is characterized by having a welding preparation step in which two or more metal plate materials are held in a state in which same overlap one another, thereby forming an interface to be welded, a temperature-raising step in which a pair of electrodes are used and the interface to be welded is heated by supplying a current by a direct method, an indirect method, or a series method, thereby forming a softened region in the vicinity of the interface to be welded, and a stress application step in which an external stress greater than or equal to the yield strength of the metal plate materials at a desired welding temperature is applied to the softened region, wherein the metal plate materials are welded to each other by subjecting the softened region to local deformation.

公开(公告)号：US20210107087A1

公开(公告)日：2021-04-15

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: B23K20/02

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.

公开(公告)号：US20230339039A1

公开(公告)日：2023-10-26

申请号：US18028000

申请日：2021-09-01

Applicant: OSAKA UNIVERSITY

Inventor： Hidetoshi FUJII ,  Huihong LIU ,  Yoshiaki MORISADA

IPC: B23K20/12

CPC classification number: B23K20/12 ,  B23K2103/24

Abstract: The objective of the present invention is to provide a friction pressure welding method with which the welding temperature can be controlled accurately, the welding temperature can be lowered, and the distribution of the welding temperature at an interface to be welded can be made uniform; and to provide a welded structure obtained by this method. The present invention relates to the friction pressure welding method in which one member is abutted against another member and is made to slide in a state in which a welding pressure substantially perpendicular to the interface to be welded is applied, said friction pressure welding method being characterized in that the maximum sliding speed is no greater than 53 mm/sec, the difference in the temperature increase rate between a center portion and an outer peripheral portion at the interface to be welded is 10° C./sec or less, and the difference between the maximum attained temperature between the center portion and the outer peripheral portion at the interface to be welded is no greater than 50° C.

公开(公告)号：US20190210149A1

公开(公告)日：2019-07-11

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: B23K20/12 ,  C04B35/584 ,  C04B37/02

CPC classification number: B23K20/127 ,  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.

公开(公告)号：US20240157467A1

公开(公告)日：2024-05-16

申请号：US18284426

申请日：2022-03-18

Applicant: OSAKA UNIVERSITY

Inventor： Hidetoshi FUJII ,  Yoshiaki MORISADA ,  Yasuhiro AOKI

IPC: B23K20/12

CPC classification number: B23K20/1205 ,  B23K2103/12

Abstract: Provided are an easy and efficient linear friction-joining method with which it is possible to form an excellent joined section between materials being joined that are of different sizes and shapes, and a linear friction-joining structure obtained through the aforementioned friction-joining method. The present invention discloses a linear friction-joining method characterized by having a first step for bringing an end surface of one member into contact with an end surface of another member to form a joining interface, a second step for repeatedly causing the one member and the other member to slide on the same trajectory in a state in which pressure is applied roughly perpendicularly to the joining interface and eliminating burrs from the joining interface, and a third step for stopping the sliding and forming a joined surface, the linear friction-joining method also being characterized in that the end surface of the one member and the end surface of the other member have different surface areas, and in that the protrusion length of the member having the lesser surface area is set equal to or greater than the upset distance.

公开(公告)号：US20240351134A1

公开(公告)日：2024-10-24

申请号：US18684478

申请日：2022-08-03

Applicant: OSAKA UNIVERSITY

Inventor： Hidetoshi FUJII ,  Yoshiaki MORISADA ,  Hiroki FUJIMOTO ,  Hiroyuki HIRATA ,  Shinji KODAMA

IPC: B23K20/12 ,  B23K103/04

CPC classification number: B23K20/1205 ,  B23K20/129 ,  B23K2103/04

Abstract: Provided are: a method for friction-joining galvanized steel sheets in which admixture of zinc into a joined part is effectively suppressed, and with which it is possible to obtain a joined part that is coated with a galvanized layer; and a joined structure obtained through the aforementioned joining method. A friction-joining method characterized by having a first step for bringing one member into contact with another member to form a joining interface, a second step for repeatedly causing the one member and the other member to slide on the same trajectory in a state in which pressure is applied substantially perpendicularly to the joining interface and eliminating burrs from the joining interface, and a third step for stopping the sliding and forming a joined surface, the friction-joining method also being characterized in that the one member and/or the other member is configured as a galvanized steel sheet, and in that admixture of a galvanized component into the joined surface is suppressed due to the elimination of the burrs.

公开(公告)号：US20240293888A1

公开(公告)日：2024-09-05

申请号：US18280702

申请日：2022-03-01

Applicant: OSAKA UNIVERSITY

Inventor： Hidetoshi FUJII ,  Yoshiaki MORISADA ,  Kohsaku USHIODA

IPC: B23K11/00 ,  B23K103/20 ,  B32B15/01

CPC classification number: B23K11/002 ,  B32B15/012 ,  B23K2103/20

Abstract: The present invention provides dissimilar material solid-phase bonding that efficiently forms a robust bonded portion of metal materials having different compositions and/or structures. The present invention is a solid-phase bonding method in which one member is brought into contact with another member to form an interface to be bonded, and a bonding load is applied, thereby forming newly-generated surfaces of the one member and the other member at the interface to be bonded, wherein the one member and the other member are brought into contact to form the interface to be bonded, the temperature of the interface to be bonded is raised using ohmic heating by running current from the one member to the other member, the one member and the other member are combined while having different electrical resistances, the temperature (T1) of the one member and the temperature (T2) of the other member in the vicinity of the interface to be bonded are set so as to differ from one another, the one member and the other member have approximately the same strength at the temperature (T1) of the one member and the temperature (T2) of the other member, and a bonding load for which a bonding pressure corresponding to said strength is applied is set substantially perpendicular to the interface to be bonded.

公开(公告)号：US20220001486A1

公开(公告)日：2022-01-06

申请号：US17291557

申请日：2020-03-06

Applicant: NGK SPARK PLUG CO., LTD. ,  OSAKA UNIVERSITY

Inventor： Hidetoshi FUJII ,  Yoshiaki MORISADA ,  Yusuke KATSU ,  Hiroki TAKEUCHI

IPC: B23K20/12

Abstract: A friction stir welding tool (1) has a shoulder portion (2) and a probe portion (6) provided on a bottom surface of the shoulder portion (2). The probe portion (6) has a length of 5.5 mm or more. In the friction stir welding tool (1), a ceramic material whose main phase is silicon nitride or sialon is used as a base material.