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：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：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.