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公开(公告)号：US10974338B2
公开(公告)日：2021-04-13
申请号：US16086653
申请日：2017-03-17
Inventor： Yuya Furuyama , Atsuhiro Kawamoto , Junji Fujiwara , Masaru Kowa , Kaito Matsui
Abstract: In thin sheet welding, when a heat input amount relative to a sheet thickness is too large, a welding defect such as a deviation from aim due to occurrence of a strain or burn through may easily occur. When a welding current is decreased to reduce the heat input amount, there is an issue in which an arc tends to become unstable. In arc welding in which short-circuit and arcing are repeated, first heat input period (Th) and second heat input period (Tc) having a heat input amount less than that of first heat input period (Th) are periodically repeated and a welding current during an arc period in second heat input period (Tc) is decreased to extinguish the arc. This reduces the heat input amount into a welding object and suppresses burn through or a strain upon welding, while making the arc stable.
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公开(公告)号：US10919100B2
公开(公告)日：2021-02-16
申请号：US16086658
申请日：2017-03-17
Inventor： Yuya Furuyama , Atsuhiro Kawamoto , Junji Fujiwara , Masaru Kowa , Kaito Matsui
Abstract: In thin sheet welding, when a heat input amount relative to a sheet thickness is too large, a welding defect such as a deviation from aim due to occurrence of a strain or burn through may easily occur. When a welding current is decreased to reduce the heat input amount, there is an issue in which an arc tends to become unstable. In arc welding that repeats short-circuit and arcing, first heat input period (Th) and second heat input period (Tc) having a heat input amount less than that of first heat input period (Th) are periodically repeated. This reduces the heat input amount into a welding object and suppresses burn through and a strain upon welding while making the arc stable.
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公开(公告)号：US10807180B2
公开(公告)日：2020-10-20
申请号：US15743433
申请日：2016-08-25
Inventor： Atsuhiro Kawamoto , Kaito Matsui , Masaru Kowa , Takahiro Noguchi , Masashi Fujiwara
IPC: B23K9/073 , B23K9/09 , B23K9/095 , B23K9/12 , B23K9/173 , B23K103/10 , B23K103/04
Abstract: A base material is welded by a first welding method in a case where a welding parameter related to heat input to the base material is less than a first threshold value. The base material is welded by a second welding method in a case where the welding parameter is less than a second threshold value and is more than the first threshold value. The base material is welded by a third welding method in a case where the welding parameter is more than the second threshold value. By adjusting welding conditions regardless of the thickness of the base material, a welding method suitable for the thickness of the base material is determined to provide a welding with little spatter and no meltdown of the base material.
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公开(公告)号：US10537955B2
公开(公告)日：2020-01-21
申请号：US14220771
申请日：2014-03-20
Inventor： Junji Fujiwara , Atsuhiro Kawamoto , Masaru Kowa
IPC: B23K9/09 , B23K9/12 , B23K9/073 , B23K9/095 , B23K9/067 , B23K103/02 , B23K103/04 , B23K103/10 , B23K9/10 , B23K37/02 , B23K9/173
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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公开(公告)号：US10537953B2
公开(公告)日：2020-01-21
申请号：US15518496
申请日：2015-11-02
Inventor： Kaito Matsui , Atsuhiro Kawamoto , Takahiro Noguchi , Masaru Kowa
Abstract: In control applying a gradient to a command voltage value during an arc period, although stable welding can be performed even in a case where a protrusion length of a welding wire becomes long, when the disturbance such as sudden change in the protrusion length is generated, a current waveform of the arc period is undershot, the short circuit period is disturbed, and it took time to return to the stable state, and the amount of sputter generation is also increased. Therefore, it is possible to suppress a change in current such as undershoot or the like when the disturbance is generated, stabilize short circuit cycle, perform welding with a strong resistance to disturbance and a small amount of sputter generation by changing an inductance value a plurality of times during the arc period.
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Patent Agency Ranking
公开(公告)号：US10155285B2
公开(公告)日：2018-12-18
申请号：US15107347
申请日：2014-12-25
Inventor： Junji Fujiwara , Yasushi Mukai , Atsuhiro Kawamoto , Tatsuyuki Nakagawa , Noriyuki Matsuoka
IPC: B23K26/322 , B23K26/00 , B23K26/244 , B25J11/00 , B23K26/22 , B23K26/082 , B23K101/00 , B23K101/34 , B23K103/04 , B23K103/08
Abstract: A laser welding method of the present disclosure includes a first step, a second step, and a third step. In the first step, a first workpiece and a second workpiece are stacked on each other. Each of the first workpiece and the second workpiece has a surface coated with a first material and is made of a second material, which is different from the first material. In the second step, a first region in which the first workpiece and the second workpiece are stacked on each other is irradiated with a laser beam so that the laser beam penetrates both the first workpiece and the second workpiece. In the third step, a second region including the first region is irradiated with a laser beam in a spiral fashion.
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公开(公告)号：US11806806B2
公开(公告)日：2023-11-07
申请号：US16086996
申请日：2017-03-28
Inventor： Atsuhiro Kawamoto , Junji Fujiwara , Shigeki Yonemori
IPC: B32B3/26 , B32B15/01 , B32B15/08 , B23K103/04 , B23K101/00 , B23K26/21 , B29C65/16 , B23K26/324 , B23K26/323
CPC classification number: B23K26/21 , B23K26/323 , B23K26/324 , B29C65/16 , B32B3/266 , B32B15/01 , B32B15/08 , B23K2101/006 , B23K2103/04 , B32B2250/40
Abstract: A joint structure includes a first material (1), a second material (2) weldable to the first material, and a third material (3) at least a portion of which being sandwiched between the first material and the second material, having a through opening portion at the sandwiched portion, and including a material that is difficult to be welded to both the first material and the second material, the first material and the second material welded the via through opening portion. At least one of the first material and the second material is provided with a protrusion (14) inserted in the through opening portion. A first gap (4) is provided between an inner peripheral surface of the through opening portion and the protrusion. A second gap (5) is provided between the first material and the second material, the second gap having a size depending on a plate thickness of the first material in a region corresponding to the protrusion. Under a condition in which the second gap has a size of greater than or equal to 0.1 mm but less than or equal to 40% of the plate thickness of the first material in the region, the first material and the second material are welded by emitting a laser beam from a side on which the first material is disposed.
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公开(公告)号：US11525469B2
公开(公告)日：2022-12-13
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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公开(公告)号：US11020820B2
公开(公告)日：2021-06-01
申请号：US15300313
申请日：2015-04-08
Inventor： Junji Fujiwara , Atsuhiro Kawamoto
IPC: B23K26/02 , B23K26/60 , B23K26/08 , B23K26/242 , B23K26/211 , B23K33/00 , B23K101/00
Abstract: A laser welding method of the present disclosure includes a first step and a second step. In the first step, a first end of a first workpiece is positioned such that the first end of the first workpiece is overlapped on a second end of a second workpiece to form a corner joint. In the second step, the first end forming the corner joint is irradiated from above with a laser beam. Additionally, the first end is positioned to protrude relative to the second workpiece in the first step.
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公开(公告)号：US10850354B2
公开(公告)日：2020-12-01
申请号：US15569850
申请日：2016-05-24
Inventor： Junji Fujiwara , Atsuhiro Kawamoto , Tatsuyuki Nakagawa , Noriyuki Matsuoka
IPC: B23K26/57 , B23K26/22 , B23K26/082 , B23K26/322 , B23K26/08 , B23K26/244 , B23K26/21 , B23K101/18 , B23K103/04 , B23K101/00 , B23K101/34
Abstract: A laser welding control method according to the present disclosure includes: a first step of causing a first steel plate having a protrusion and a second steel plate to overlap so that a tip of the protrusion provided on the first steel plate makes contact with the second steel plate; and a second step of irradiating the protrusion with laser light in an irradiation pattern having a size larger than a size of the protrusion in plan view after the first step. At least one of a surface of the first steel plate that faces the second steel plate and a surface of the second steel plate that faces the first steel plate is plated.
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