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1. 发明授权

US10040145B2 Spot welding method of high-strength steel sheets excellent in joint strength 有权
公开(公告)号：US10040145B2
公开(公告)日：2018-08-07
申请号：US14417075
申请日：2012-09-24
申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION
发明人： Seiji Furusako , Hatsuhiko Oikawa , Yasunobu Miyazaki
IPC分类号： B23K11/16 , B23K11/11 , B23K11/24 , B23K103/04
摘要： When two high-strength steel sheets (1A, 1B) whose sheet thickness ratio={the sum of sheet thicknesses of the steel sheets}/{the sheet thickness of the thinner steel sheet (when they have the same thickness, the sheet thickness per one sheet)} is within a range of not less than 2 nor more than 5 and which both have tensile strength of not less than 780 MPa nor more than 1850 MPa are stacked to be subjected to resistance spot welding, a first welding step being pre-welding with a pressurizing force P1 kN and a welding current I1 kA and a second welding step being main welding with a pressurizing force P2 kN and a welding current I2 kA are performed, the pressurizing forces P1, P2 are set to a fixed pressurizing force P=P1=P2 all through the first welding step and the second welding step and are set within a range expressed by {0.5≤P≤3.0t(1/3)}, where t mm is an average sheet thickness of the steel sheets (1A, 1B), the welding current I1 is set within a range of not less than 30% nor more than 90% of the welding current I2, and the second welding step is started within 0.1 s after the first welding step is finished.

2. 发明授权

US10406627B2 Resistance spot welding method 有权
公开(公告)号：US10406627B2
公开(公告)日：2019-09-10
申请号：US15025459
申请日：2014-12-18
申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION
发明人： Hiroki Fujimoto , Hatsuhiko Oikawa , Shintaro Yamanaka , Takashi Imamura
IPC分类号： B23K11/24 , B23K11/11 , B23K11/16
摘要： By superposing a plurality of steel sheets including a high tensile steel sheet and performing pulsation conduction by an inverter DC type spot welding power supply and controlling the conduction time of the current pulses, intervals of the current pulses, that is, conduction idle time, and weld current applied at the current pulses in a variable manner, the optimum weld conditions are obtained. For resistance spot welding of the hot stamped steel sheet, resistance spot welding with a minimum weld current of a second pulsation step higher than the maximum weld current at a first pulsation step is used to suppress the occurrence of outer spatter and inner spatter and secure a broad suitable current range even if using an inverter DC power supply.

3. 发明授权

US09610648B2 Spot welded joint and spot welding method 有权
公开(公告)号：US09610648B2
公开(公告)日：2017-04-04
申请号：US14490538
申请日：2014-09-18
申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION
发明人： Hatsuhiko Oikawa , Hideki Hamatani , Masafumi Azuma , Noriyuki Suzuki , Fuminori Watanabe , Naoki Maruyama , Hiroyuki Kawata
IPC分类号： B23K11/16 , B23K11/11 , B32B15/01 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , B23K101/18 , B23K101/34 , B23K103/04
CPC分类号： B23K11/115 , B23K11/16 , B23K11/166 , B23K2101/18 , B23K2101/34 , B23K2103/04 , B32B15/011 , C22C38/001 , C22C38/02 , C22C38/04 , C22C38/06 , Y10T428/12347 , Y10T428/12965
摘要： Provided is a spot welded joint (10) which includes at least one thin steel plate with a tensile strength of 750 MPa to 1850 MPa and a carbon equivalent Ceq of equal to or more than 0.22 mass % to 0.55 mass % and in which a nugget (3) is formed in an interface of the thin steel plates (1A, 1B). In a nugget outer layer zone, a microstructure consists of a dendrite structure in which an average value of arm intervals is equal to or less than 12 μm, an average grain diameter of carbides contained in the microstructure is 5 nm to 100 nm, and a number density of carbides is equal to or more than 2×106/mm2.

4. 发明申请

US20150174690A1 SPOT WELDING METHOD OF HIGH-STRENGTH STEEL SHEETS EXCELLENT IN JOINT STRENGTH 审中-公开
标题翻译：高强度钢点焊点焊接方法
公开(公告)号：US20150174690A1
公开(公告)日：2015-06-25
申请号：US14417075
申请日：2012-09-24
申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION
发明人： Seiji Furusako , Hatsuhiko Oikawa , Yasunobu Miyazaki
IPC分类号： B23K11/11 , B23K11/24 , B23K11/16
CPC分类号： B23K11/115 , B23K11/16 , B23K11/241 , B23K2101/04 , B23K2103/04
摘要： When two high-strength steel sheets (1A, 1B) whose sheet thickness ratio={the sum of sheet thicknesses of the steel sheets}/{the sheet thickness of the thinner steel sheet (when they have the same thickness, the sheet thickness per one sheet)} is within a range of not less than 2 nor more than 5 and which both have tensile strength of not less than 780 MPa nor more than 1850 MPa are stacked to be subjected to resistance spot welding, a first welding step being pre-welding with a pressurizing force P1 kN and a welding current I1 kA and a second welding step being main welding with a pressurizing force P2 kN and a welding current I2 kA are performed, the pressurizing forces P1, P2 are set to a fixed pressurizing force P=P1=P2 all through the first welding step and the second welding step and are set within a range expressed by {0.5≦P≦3.0t(1/3)}, where t mm is an average sheet thickness of the steel sheets (1A, 1B), the welding current I1 is set within a range of not less than 30% nor more than 90% of the welding current I2, and the second welding step is started within 0.1 s after the first welding step is finished.
摘要翻译：当两片高强度钢板（1A，1B）的板厚比= {钢板的板厚的总和} / {薄钢板的板厚（当它们具有相同的厚度时，一片）}在不小于2且不大于5的范围内，并且其拉伸强度不低于780MPa并且不大于1850MPa都被堆叠以进行电阻点焊，第一焊接步骤是预先以加压力P1kN和焊接电流I1 kA进行焊接，第二焊接步骤为加压力P2 kN和焊接电流I2 kA的主要焊接，加压力P1，P2设定为固定的加压力 P = P1 = P2全部通过第一焊接步骤和第二焊接步骤，并设置在由{0.5＆nlE; P＆nlE; 3.0t（1/3）}表示的范围内，其中t mm是钢的平均板厚片（1A，1B）中，焊接电流I1设定在不小于30％的范围内不超过90％的焊接电流I2，第二焊接步骤在第一焊接步骤完成后的0.1s内开始。

5. 发明授权

US10265797B2 Resistance spot welding method 有权
公开(公告)号：US10265797B2
公开(公告)日：2019-04-23
申请号：US14902985
申请日：2014-06-26
申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION
发明人： Hiroki Fujimoto , Hatsuhiko Oikawa , Shintaro Yamanaka
IPC分类号： B23K11/24 , B23K11/16 , B23K11/11 , B23K101/18 , B23K103/04
摘要： A resistance spot welding method including: a pulsation process of clamping a sheet assembly of two or more overlapped steel sheets including at least one high tensile steel sheet using a pair of welding electrodes that are connected to a spot welding power source employing an inverter direct current method, and performing plural repetitions of current passing and current pass stopping, while pressing the steel sheets with the welding electrodes; and a continuous current pass process in which, after the pulsation process, current is passed continuously for a longer period of time than a maximum current pass time of the pulsation process, while pressing the steel sheets with the welding electrodes.

6. 发明授权

US10081071B2 Arc spot welded joint and manufacturing method thereof 有权
公开(公告)号：US10081071B2
公开(公告)日：2018-09-25
申请号：US14906212
申请日：2014-07-30
申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION
发明人： Seiji Furusako , Shinji Kodama , Yasunobu Miyazaki , Hatsuhiko Oikawa
IPC分类号： B23K9/23 , B23K9/00 , B23K9/007 , C22C38/00 , C22C38/06 , C22C38/38 , B23K101/18 , B23K103/04
CPC分类号： B23K9/007 , B23K9/23 , B23K35/0255 , B23K35/0261 , B23K2101/18 , B23K2103/04 , B32B15/01 , B32B15/011 , C22C38/00 , C22C38/06 , C22C38/38
摘要： In an arc spot welded joint manufacturing method in which two steel sheets configured by high strength steel having a component carbon content of 0.07% by mass or greater are overlapped, and the sheets are lap welded together in a spot pattern. The method includes a first welding pass in which a second steel sheet on the lower side is melted up to a back face side, and first weld metal is formed including a first reinforcement portion, and a second welding pass in which a second weld metal including a second reinforcement portion is formed over the first weld metal, such that the heights of the first reinforcement portion or the second reinforcement portion is formed at t/5 or greater with respect to the sheet thickness t of the steel sheets, and the average weld bead diameter is formed at from 3t to 10t.

7. 发明授权

US09970116B2 Al-plated steel sheet used for hot pressing and method for manufacturing Al-plated steel sheet used for hot pressing 有权
公开(公告)号：US09970116B2
公开(公告)日：2018-05-15
申请号：US15103152
申请日：2014-12-10
申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION
发明人： Soshi Fujita , Shintaro Yamanaka , Jun Maki , Hiroki Fujimoto , Hatsuhiko Oikawa , Hideaki Irikawa
IPC分类号： B32B15/04 , C23C22/66 , C23C2/12 , C23C2/28 , C23C2/40 , C22C21/02 , C22C38/00 , C22C38/38 , B21D22/02 , B21D35/00 , C22C21/00 , B32B15/01 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/18 , C23C2/20
CPC分类号： C23C22/66 , B21D22/022 , B21D35/005 , B32B15/012 , C22C21/00 , C22C21/02 , C22C38/00 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/18 , C22C38/38 , C23C2/12 , C23C2/20 , C23C2/28 , C23C2/40 , Y10T428/12611 , Y10T428/12757
摘要： Provided is an Al-plated steel sheet used for hot pressing that has excellent lubricity in hot state, corrosion resistance after paint coating, and spot weldability. An Al-plated steel sheet used for hot pressing includes: a steel sheet; an Al plating layer formed on one surface or both surfaces of the steel sheet; and a surface coating layer formed on the Al plating layer. The surface coating layer contains a zinc compound, and the zinc compound is deposited on the Al-plated steel sheet in an amount of equal to or greater than 0.3 g/m2 and equal to or less than 1.5 g/m2 as an amount of metallic zinc per one surface, and a zinc deposition amount in any continuous 1 mm2 region is 1.5 g/m2 or less.

8. 发明授权

US10081073B2 Spot welded joint 有权
公开(公告)号：US10081073B2
公开(公告)日：2018-09-25
申请号：US14395970
申请日：2013-04-25
申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION
发明人： Fuminori Watanabe , Tomohito Tanaka , Seiji Furusako , Yasunobu Miyazaki , Hideki Hamatani , Hatsuhiko Oikawa
IPC分类号： B23K11/11 , B23K11/16 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06
CPC分类号： B23K11/16 , B23K11/11 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , H01L2924/01015 , Y10T403/478
摘要： In a spot welded joint according to an aspect of the present invention, with respect to a rectangular planar region of 100 μm×100 μm which is perpendicular to a sheet surface of the plurality of the steel sheets and which centers around an inner point spaced away by 100 μm in a direction parallel with the sheet surface from an edge of a nugget, in a case of measuring a P concentration at a pitch of 1 μm to obtain measured values of the P concentration at 100×100 of measurement points, and in a case of repetitively calculating an average value of the measured values of the P concentration at 20 of the measurement points which are adjacent to each other and which are arranged in a row in the direction parallel with the sheet surface among the 100×100 of the measurement points while shifting each one point to obtain 81×100 of the average values, the number of the average values which are more than two times an average P concentration is 0 to 100.

9. 发明申请

US20150104243A1 SPOT WELDED JOINT 审中-公开
标题翻译： SPOT焊接接头
公开(公告)号：US20150104243A1
公开(公告)日：2015-04-16
申请号：US14395970
申请日：2013-04-25
申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION
发明人： Fuminori Watanabe , Tomohito Tanaka , Seiji Furusako , Yasunobu Miyazaki , Hideki Hamatani , Hatsuhiko Oikawa
IPC分类号： B23K11/16 , B23K11/11
CPC分类号： B23K11/16 , B23K11/11 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , H01L2924/01015 , Y10T403/478
摘要： In a spot welded joint according to an aspect of the present invention, with respect to a rectangular planar region of 100 μm×100 μm which is perpendicular to a sheet surface of the plurality of the steel sheets and which centers around an inner point spaced away by 100 μm in a direction parallel with the sheet surface from an edge of a nugget, in a case of measuring a P concentration at a pitch of 1 μm to obtain measured values of the P concentration at 100×100 of measurement points, and in a case of repetitively calculating an average value of the measured values of the P concentration at 20 of the measurement points which are adjacent to each other and which are arranged in a row in the direction parallel with the sheet surface among the 100×100 of the measurement points while shifting each one point to obtain 81×100 of the average values, the number of the average values which are more than two times an average P concentration is 0 to 100.
摘要翻译：在根据本发明的一个方面的点焊接头中，相对于与多个钢板的板表面垂直的100μm×100μm的矩形平面区域，并且围绕内部点间隔开在以0.1μm的间距测定P浓度的情况下，在与测量点的100×100的P浓度的测定值相同的情况下，在与熔核的边缘平行的方向上100μm，在相邻的测量点的20处重复计算P浓度的测量值的平均值的情况，并且在100×100的100×100 测量点在移动每一点以获得平均值的81×100时，平均P浓度的两倍以上的平均值的数量为0至100。

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