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公开(公告)号：US20180043466A1
公开(公告)日：2018-02-15
申请号：US15556792
申请日：2016-03-17
发明人： Muneo MATSUSHITA , Koichi TANIGUCHI , Rinsei IKEDA
IPC分类号： B23K20/12
CPC分类号： B23K20/1235 , B23K20/12 , B23K20/1225 , B23K20/1245
摘要： A friction stir welding apparatus that includes a rotary tool and a heating device. The heating device is placed in front of the rotary tool to heat steel sheets that are used as a workpiece. The rotary tool is moved in the welding direction so that steel sheet is softened by frictional heat. Additionally, the surface temperature, the area, and the position of the heated region during the heating process are strictly controlled. The heating of the steel sheets by the welding apparatus provides sufficient strength and good welding workability by advantageously eliminating plastic flow defects generated due to insufficient heating of workpieces.
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公开(公告)号：US20160271719A1
公开(公告)日：2016-09-22
申请号：US15033168
申请日：2014-12-04
发明人： Koichi TANIGUCHI , Yasuaki OKITA , Rinsei IKEDA
CPC分类号： B23K11/115 , B23K11/0026 , B23K11/166 , B23K2101/006 , B23K2101/18 , B23K2101/34 , B23K2103/04
摘要： Resistance spot welding is performed on a combination of overlapping steel sheets including at least one steel sheet that has, on a surface thereof, a coated layer with zinc as a main component, by (1) starting electric current passage in a state satisfying 0.9×t≦L≦1.1×t; and (2) dividing electric current into main current and initial current that precedes the main current and is two-step current, setting a current value I1 during current in a first step of the initial current to satisfy Im×1.1≦I1≦15.0 kA with respect to a current value In, during the main current, and setting a current value I2 in the subsequent second step to no current or low current satisfying 0≦I2≦Im×0.7.
摘要翻译： 电阻点焊是通过以下方式进行的：重叠钢板的组合包括：至少一个钢板，其表面上具有以锌为主要成分的涂层，（1）以满足0.9×的状态启动电流通道 t≤L≤1.1×t; 和（2）将电流分为主电流和在主电流之前的初始电流，是两级电流，在初始电流的第一步中的电流中设定电流值I1以满足Im×1.1≤I1≤15.0kA 相对于当前值In，在主电流期间，并将随后的第二步骤中的电流值I2设定为不满足0≤I2≤Im×0.7的电流或低电流。
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公开(公告)号：US20240198443A1
公开(公告)日：2024-06-20
申请号：US18287320
申请日：2022-04-26
摘要： An arc welded joint and an arc welding method. The arc welded joint has a weld formed by arc welding of an overlap of at least two steel sheets. The throat in the weld and the sheet that is uppermost among the steel sheets satisfy a specified relationship. In a region extending 2.0 mm from a bead toe of the weld in a weld metal direction and also extending 2.0 mm from the bead toe in a base material direction, a slag-covered area ratio is 50% or less.
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公开(公告)号：US20240238891A1
公开(公告)日：2024-07-18
申请号：US18291661
申请日：2022-07-19
发明人： Nao KAWABE , Chikaumi SAWANISHI , Katsutoshi TAKASHIMA , Koichi TANIGUCHI , Hiroshi MATSUDA , Daiki YAMAGISHI
IPC分类号： B23K11/11
CPC分类号： B23K11/115
摘要： A resistance spot welding method in which a high strength zinc-based coated steel sheet used in a sheet set has an equivalent carbon content of 0.20% or more and a tensile strength of 780 MPa or more. The method includes performing a first energization step such that a current value at the end of the energization, a current value Is at the start of the energization, and a thickness of the thinnest steel sheet among steel sheets overlapping each other satisfy specified relationships. The method includes performing a second energization step in which a cooling step of holding a non-energization state for 10 ms or longer and shorter than 160 ms and performing energization at a current value equal to or more than the current value at the end of the first energization step for 20 ms or longer and shorter than 200 ms are repeated.
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公开(公告)号：US20200306871A1
公开(公告)日：2020-10-01
申请号：US16089217
申请日：2017-03-22
发明人： Muneo MATSUSHITA , Rinsei IKEDA , Koichi TANIGUCHI
摘要： An object is to provide a friction stir welding method and apparatus that provide sufficient strength and good welding workability by advantageously eliminating plastic flow deficiency generated as a result of insufficient heating of workpieces.In friction stir welding for steel sheets (3,3) as workpieces, a pair of facing rotary tools (1,15) are inserted into a non-welded part from both one surface side and the other surface side of the steel sheets (3,3), the rotary tools move in a welding direction while rotating, and in addition, a preheating process for heating steel sheets (3,3) is performed by heating means (5) provided in front of the rotary tools (1,15). The configuration of the pair of facing rotary tools (1,15) and the surface temperature, area, position, and so forth of a heated region in the preheating process are strictly controlled.
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公开(公告)号：US20190161822A1
公开(公告)日：2019-05-30
申请号：US16320864
申请日：2017-08-10
IPC分类号： C21D9/46 , C21D8/02 , C22C38/38 , C22C38/12 , C22C38/08 , C22C38/22 , C22C38/00 , C22C38/26 , C22C38/24 , C22C38/28 , C22C38/14 , C22C38/32 , C22C38/06 , C22C38/04 , C22C38/02 , C23C2/02 , C23C2/06 , C23C2/28
摘要： A high-strength steel sheet having a specified chemical composition and a method for producing the same. The steel sheet including a multi-phase structure including, by volume fraction, ferrite of 35% to 65%, residual austenite of 7% or less (including 0%), martensite of 20% to 60%, bainite of 20% or less (including 0%), the ferrite having an average crystal grain size of 8 μm or less and an average aspect ratio of 3.5 or less, the martensite having an average crystal grain size of 3 μm or less, and the bainite having an average crystal grain size of 3 μm or less when contained. A standard deviation of Vickers hardness of the steel sheet being 30 or less when measured at 200 μm intervals from a position of 100 μm from a surface to a central portion in a thickness direction of the sheet.
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公开(公告)号：US20240198447A1
公开(公告)日：2024-06-20
申请号：US18287348
申请日：2022-04-26
IPC分类号： B23K9/23 , B23K9/025 , B23K35/38 , B23K101/18 , B23K103/04
CPC分类号： B23K9/23 , B23K9/025 , B23K35/38 , B23K2101/18 , B23K2103/04
摘要： An arc welded joint and an arc welding method. The arc welded joint has a weld formed by arc welding of an overlap of at least two steel sheets. A slag-covered area ratio is 20% or less. A Vickers hardness of a weld metal and a Vickers hardness of softened portions of a weld heat affected zone in the weld satisfy a specified relationship.
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公开(公告)号：US20240181555A1
公开(公告)日：2024-06-06
申请号：US18285571
申请日：2022-03-07
发明人： Nao KAWABE , Chikaumi SAWANISHI , Katsutoshi TAKASHIMA , Koichi TANIGUCHI , Hiroshi MATSUDA , Daiki YAMAGISHI
IPC分类号： B23K11/11 , B23K11/16 , B23K101/34 , B23K103/04
CPC分类号： B23K11/115 , B23K11/166 , B23K2101/34 , B23K2103/04
摘要： A resistance spot welding method for joining two or more steel sheets including at least one zinc-coated steel sheet. The method includes a first current applying step and a second current applying step. The first current applying step involves forming a nugget having a nugget diameter of 3√t or more and 4.5√t or less by setting a current value I1 (kA) and a weld time, where t is a thickness of the thinnest steel sheet among the overlapping steel sheets. The second current applying step involves growing the nugget by repeating a cooling step for maintaining a zero-current state for 10 ms or more and less than 160 ms and a current applying step for applying a current for 20 ms or more and less than 200 ms at a current value I2 (kA) greater than or equal to the current value I1 (kA).
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公开(公告)号：US20240123531A1
公开(公告)日：2024-04-18
申请号：US18276758
申请日：2022-02-22
CPC分类号： B23K1/0056 , B23K1/19 , B23K2103/20
摘要： A method for producing a flared or lap joint including a steel sheet and an aluminum-based sheet material through brazing, wherein a preceding laser beam irradiates ahead of a steel sheet joining position and the aluminum-based sheet material in the joining direction to preheat a joining position, an electrically-heated aluminum-based filler wire feeds to the joining position, a following laser beam is irradiated behind the filler wire so the wire melts performin brazing, and the filler wire is fed with a tilt ranging from 0°≤D≤19° to a front or rear side in the joining direction with respect to a line passing through a groove center of the flared joint and is perpendicular to the joining direction, so that a flared joint or lap joint including a steel sheet and aluminum-based sheet material is produced without appearance defects of a bead and with a sufficient joint strength.
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公开(公告)号：US20200269342A1
公开(公告)日：2020-08-27
申请号：US16645789
申请日：2018-08-14
IPC分类号： B23K11/16
摘要： Main current passage and subsequent current passage are performed, with a cooling time of 0.01 s or more being provided between the main current passage and the subsequent current passage. Ip/I which is a ratio of a current value of the subsequent current passage to a current value of the main current passage is controlled to satisfy a predetermined relationship depending on a constant A defined by Mn content and P content of a steel sheet as a part to be welded, in relation to a welding time Tp of the subsequent current passage, a cooling time T, and the constant A.
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