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公开(公告)号：US20240375211A1
公开(公告)日：2024-11-14
申请号：US18781168
申请日：2024-07-23
Inventor： Tatsuyuki NAKAGAWA , Atsuhiro KAWAMOTO , Junji FUJIWARA , Michio SAKURAI
IPC: B23K26/06
Abstract: A transmission fiber includes a first core and a second core. The second core is provided on the outer periphery of the first core. In a first step of a laser termination process, a first laser beam is emitted from the second core, and a second laser beam is emitted from the first core. In a second step, the output power of the second laser beam is gradually reduced while a position at which the first laser beam and the second laser beam are emitted to a workpiece is moved in a laser processing direction. In a third step, the output of the second laser beam is stopped while the first laser beam is emitted from the second core.
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公开(公告)号：US20210388859A1
公开(公告)日：2021-12-16
申请号：US17459377
申请日：2021-08-27
Inventor： Junji FUJIWARA , Atsuhiro KAWAMOTO , Hitoshi NISHIMURA , Yasushi MUKAI , Shigeki YONEMORI
Abstract: A joint structure includes a first metallic material having a first projection, a second metallic material similar to and weldable to the first metallic material, and a different material having a first penetrating part and sandwiched between the first and second metallic materials, the different material being difficult to weld to the first and second metallic materials. The first projection is smaller than the first penetrating part and is spaced from the rim of the first penetrating part. The first projection is positioned in the first penetrating part and spaced from the second metallic material by a gap. The gap has a size of a predetermined percentage of the thickness of the first projection to which arc welding is applied. The first and second metallic materials are melted and joined together inside the first penetrating part to compress and fix the different material, so all three are fixed together.
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公开(公告)号：US20210023656A1
公开(公告)日：2021-01-28
申请号：US17066913
申请日：2020-10-09
Inventor： Toru SAKAI , Atsuhiro KAWAMOTO , Junji FUJIWARA , Michio SAKURAI
IPC: B23K26/244 , B23K26/70 , B23K26/10
Abstract: A laser welding device is configured to switch an irradiation position of a measurement beam between a position of a keyhole coaxial with the optical axis of a laser beam and a position of a weld bead behind the center of an optical axis of the laser beam in a welding direction. The laser welding device determines whether there is a gap between an upper metal plate and a lower metal plate based on a measured value of a recess depth measured at the position of the weld bead.
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公开(公告)号：US20200298340A1
公开(公告)日：2020-09-24
申请号：US16088523
申请日：2017-03-23
Inventor： Junji FUJIWARA , Atsuhiro KAWAMOTO
IPC: B23K26/323 , B23K9/02 , F16B5/08 , F16B5/04
Abstract: A joint structure includes a first metallic material having a first projection; a second metallic material similar in type to the first metallic material and weldable to the first metallic material, the second metallic material having a first penetrating part larger in diameter or width than the first projection, the first projection being positioned in the first penetrating part; and a different type of material different in type from the first metallic material and the second metallic material and difficult to be welded to the first metallic material and the second metallic material, the different type of material having a second penetrating part larger in diameter or width than the first projection, the rim of the second penetrating part being spaced radially or widthwise from the first projection by a first gap. The first projection is positioned in the second penetrating part with the first gap between the first projection and the second penetrating part, the size of the first gap being varied depending on the type of the different type of material. The first projection is further positioned in the first penetrating part. Hence, the different type of material is sandwiched between the first metallic material and the second metallic material. The outer edge of the first projection is welded to the inner edge of the first penetrating part so that the first metallic material and the second metallic material are melted and joined together to compress and fix the different type of material between the first metallic material and the second metallic material, thereby fixing the first metallic material, the second metallic material, and the different type of material together.
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公开(公告)号：US20190257333A1
公开(公告)日：2019-08-22
申请号：US16318422
申请日：2017-08-03
Inventor： Junji FUJIWARA , Atsuhiro KAWAMOTO
Abstract: A junction structure includes a first metallic material, a second material different in type from the first metallic material, and a welding wire as a third material similar to the first metallic material. The second material is stacked on the first material. The molten metal of the third metallic material is deposited by arc welding into the through part of the second material so as to form a flanged or tapered bead, so that the first and third metallic materials and the second material are fixed together.
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Patent Agency Ranking
公开(公告)号：US20190076962A1
公开(公告)日：2019-03-14
申请号：US16088617
申请日：2017-03-28
Inventor： Atsuhiro KAWAMOTO , Junji FUJIWARA , Yasushi MUKAI , Hitoshi NISHIMURA
IPC: B23K26/21 , B23K26/323 , B23K26/324 , B29C65/16 , B23K11/30
Abstract: A laser welding method according to the present disclosure includes a step in which a third material is interposed between a first material and a second material, which are made of the same type of metal so as to be weldable to one another, and at least one of which is provided with a protruding portion, wherein the third material is difficult to weld to the first material and the second material and has a through-hole portion into which the protruding portion is inserted. The method also includes a step in which, when the third material is interposed between the first material and the second material, a region corresponding to the protruding portion is irradiated with a laser beam from the first material side, and the first material and the second material are welded via the through-hole portion. In the step in which the third material is interposed between the first material and the second material, a first gap is provided between the protruding portion and the inner peripheral face of the through-hole portion, and a second gap corresponding to the plate thickness of the first material is provided between the first material and the second material in the region corresponding to the protruding portion.
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公开(公告)号：US20200298339A1
公开(公告)日：2020-09-24
申请号：US16088599
申请日：2017-03-22
Inventor： Atsuhiro KAWAMOTO , Junji FUJIWARA
IPC: B23K26/21 , B23K26/323 , B23K26/324 , B29C65/64
Abstract: A joint structure includes: a first same-type metal member; a second same-type metal member that can be mutually welded with the first same-type metal member; and a different-type member that has a penetrating portion, is interposed between the first same-type metal member and the second same-type metal member. In the plate thickness direction of an emission region in which a laser beam is emitted toward the penetrating portion, the plate thickness at the emission region of the first same-type metal member positioned on the side on which the laser beam is emitted is a predetermined thickness corresponding to a first gap. The first same-type metal member and the second same-type metal member are fused and bonded together via the penetrating portion, and the different-type member is compressed and fixed, such that the different-type member is fixed to the first same-type metal member and the second same-type metal member.
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公开(公告)号：US20170355035A1
公开(公告)日：2017-12-14
申请号：US15687850
申请日：2017-08-28
Inventor： Junji FUJIWARA , Yasushi MUKAI , Atsuhiro KAWAMOTO
CPC classification number: B23K9/095 , B23K9/073 , B23K9/0732 , B23K9/09 , B23K9/124
Abstract: An arc-welding method in welding by repeating a short circuit and an arc. When the sign of opening of the short circuit is detected, the welding current is reduced from a first current value at the detection of the sign to a second current value, which is lower than the first current value. When the opening of the short circuit is detected, a pulse current having a peak value higher than the first current value is supplied at a plurality of times in the arc period. This suppresses porosities and spatters when galvanized steel sheets are welded.
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公开(公告)号：US20190275603A1
公开(公告)日：2019-09-12
申请号：US16426202
申请日：2019-05-30
Inventor： Junji FUJIWARA , Atsuhiro KAWAMOTO , Masaru KOWA
Abstract: Disclosed is a method for controlling arc welding where an arc is generated between a welding wire as a consumable electrode and an object to be welded. The method includes: keeping a wire feed speed at a predetermined constant speed in a steady-state welding period; and at a time point when welding termination is ordered, either switching the wire feed speed from the predetermined constant speed to a wire feed speed at which the welding wire is fed in alternating forward and backward directions, or decreasing the wire feed speed from the predetermined constant speed with time, and then switching the wire feed speed to the wire feed speed at which the welding wire is fed in alternating forward and backward directions at a time point when a predetermined time period has passed since when welding termination was ordered.
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10.发明申请公开(公告)号：US20180126491A1
公开(公告)日：2018-05-10
申请号：US15564207
申请日：2016-05-18
Inventor： Tatsuyuki NAKAGAWA , Yasushi MUKAI , Atsuhiro KAWAMOTO , Junji FUJIWARA , Noriyuki MATSUOKA
IPC: B23K26/082 , B23K26/22 , B23K26/00 , B23K26/06
CPC classification number: B23K26/082 , B23K26/0626 , B23K26/0643 , B23K26/0648 , B23K26/0884 , B23K26/22 , B23K26/244 , B23K26/354 , B23K2103/04
Abstract: A welding target is irradiated with a laser beam so as to form a beam spot that moves relatively with respect to the welding target along a locus having a spiral shape rotating around a rotation center moving in a welding direction. The welding target is welded using the laser beam irradiated with. While the welding target is irradiated with the laser beam, the welding target is irradiated with the laser beam based on an interval coefficient which is a value indicating an overlapping degree of the locus having the spiral shape in the welding direction.
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