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公开(公告)号：US11095004B2
公开(公告)日：2021-08-17
申请号：US15943065
申请日：2018-04-02
Applicant: GM Global Technology Operations LLC
Inventor： Wu Tao , Li Sun , Xiaochao Que , Haijing Liu , Teresa J. Rinker , Jeffrey A. Abell
IPC: H01M50/531 , B23K26/00 , B23K26/22 , B23K26/32 , H01M10/0525
Abstract: A method for laser welding a plurality of battery foils to a battery tab that does not include ultrasonic welding and includes clamping the plurality of battery foils and the battery tab together. Each of the plurality of battery foils has a thickness that is between 0.004 millimeters and 0.03 millimeters. The battery tab has a thickness that is between 0.1 millimeters and 0.5 millimeters. The method further includes laser welding the plurality of battery foils to the battery tab.
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公开(公告)号：US11077522B2
公开(公告)日：2021-08-03
申请号：US15779743
申请日：2016-01-18
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： David Yang , Wu Tao , Li Sun
IPC: B23K26/20 , B23K26/32 , B23K26/22 , B23K26/073 , B23K26/322 , B23K103/10 , B23K103/00 , B23K101/34 , B23K101/00
Abstract: A method of laser spot welding a workpiece stack-up that includes at least two overlapping steel workpieces, at least one of which includes a surface coating, is disclosed. The method includes directing a laser beam at the top surface of the workpiece stack-up to create a molten steel weld pool that penetrates into the stack-up. The molten steel weld pool is then grown to penetrate further into the stack-up by increasing an irradiance of the laser beam while reducing the projected sectional area of the laser beam at a plane of the top surface of the workpiece stack-up. Increasing the irradiance of the laser beam may be accomplished by moving a focal point of the laser beam closer to the top surface or by reducing an angle of incidence of the laser beam so as to reduce the eccentricity of the projected sectional area of the laser beam.
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Patent Agency Ranking
公开(公告)号：US20190305285A1
公开(公告)日：2019-10-03
申请号：US15943065
申请日：2018-04-02
Applicant: GM Global technology Operations LLC
Inventor： Wu Tao , Li Sun , Xiaochao Que , Haijing Liu , Teresa J. Rinker , Jeffrey A. Abell
Abstract: A method for laser welding a plurality of battery foils to a battery tab that does not include ultrasonic welding and includes clamping the plurality of battery foils and the battery tab together. Each of the plurality of battery foils has a thickness that is between 0.004 millimeters and 0.03 millimeters. The battery tab has a thickness that is between 0.1 millimeters and 0.5 millimeters. The method further includes laser welding the plurality of battery foils to the battery tab.
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公开(公告)号：US20180290233A1
公开(公告)日：2018-10-11
申请号：US15483708
申请日：2017-04-10
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Li Sun , David Yang , Xiaochuan Xiong
Abstract: An apparatus for trimming a sheet metal workpiece includes a base to support the sheet metal workpiece at a working position on the base. A shearing tool is connected to the base to trim the sheet metal workpiece by mechanically inducing a shearing stress on the sheet metal workpiece to form an edge at an edge location on the sheet metal workpiece. A heater is connected to the base to define a heated region on the sheet metal workpiece by heating at least the edge location on the sheet metal workpiece after the sheet metal workpiece is in the working position. The apparatus includes a temperature sensor to detect a surface temperature of the heated region.
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公开(公告)号：US20160355902A1
公开(公告)日：2016-12-08
申请号：US15101613
申请日：2014-01-20
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： David Yang , Jing Zhang , Li Sun , Blair E. Carlson
IPC: C21D9/50 , B23K11/16 , B23K11/11 , C21D11/00 , B23K26/32 , B23K20/10 , B23K20/22 , B23K9/23 , B23K26/14
CPC classification number: C21D9/505 , B23K9/16 , B23K9/23 , B23K11/115 , B23K11/16 , B23K20/10 , B23K20/22 , B23K26/244 , B23K26/32 , B23K26/348 , B23K2103/04 , B23K2103/10 , B23K2103/50 , C21D9/50 , C21D11/00 , C21D11/005 , C21D2211/008
Abstract: A welding method includes the following steps: (a) determining a martensite tempering temperature of the at least two workpieces based, at least in part, on the chemical composition and microstructure of the woworkpieces; (b) applying sufficient energy to the workpieces to melt the workpieces at a target location, thereby creating a weld pool; (c) determining, via the control module, a target temperature and cooling range of a coolant and cooling range based, at least in part, on the martensite tempering temperature and HAZ width; and (d) cooling the first and second workpieces with the coolant such that a temperature of the workpieces at heat-affected zones is controlled below the martensite tempering temperature in order to minimize softening at the heat-affected zones. The present invention also relates to a welding system for minimizing HAZ softening.
Abstract translation: 一种焊接方法包括以下步骤：（a）至少部分地基于所述焊料的化学组成和微结构来确定所述至少两个工件的马氏体回火温度; （b）向工件施加足够的能量以在目标位置处熔化工件，从而形成焊接池; （c）至少部分地基于马氏体回火温度和HAZ宽度，经由控制模块确定冷却剂的目标温度和冷却范围;以及冷却范围; 和（d）用冷却剂冷却第一和第二工件，使得热影响区域的工件的温度控制在马氏体回火温度以下，以使热影响区域的软化最小化。 本发明还涉及一种用于最小化HAZ软化的焊接系统。
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公开(公告)号：US20190071747A1
公开(公告)日：2019-03-07
申请号：US15698114
申请日：2017-09-07
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Abstract: A method of heat treating a steel workpiece may include two heat treatment stages. In the first stage, the steel workpiece may be heated to a first temperature greater than or equal to its A1 temperature, but less than its A3 temperature to transform the microstructure of the steel workpiece into a multiphase microstructure including grains of ferrite and grains of austenite having an average grain diameter. In the second stage, the steel workpiece may be heated to a second temperature greater than the first temperature to increase the average grain diameter of the grains of austenite. Thereafter, the steel workpiece may be cooled to ambient temperature at a rate sufficient to retain a major portion of the grains of austenite obtained during the first and second heat treatment stages. The as-heat treated steel workpiece may comprise a retained austenite phase dispersed within a ferrite matrix phase at ambient temperature.
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公开(公告)号：US20200316713A1
公开(公告)日：2020-10-08
申请号：US15779743
申请日：2016-01-18
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： David Yang , Wu Tao , Li Sun
IPC: B23K26/22 , B23K26/073 , B23K26/322
Abstract: A method of laser spot welding a workpiece stack-up (10) that includes at least two overlapping steel workpieces (12,14), at least one of which includes a surface coating (40), is disclosed. The method includes directing a laser beam (24) at the top surface (20) of the workpiece stack-up (10) to create a molten steel weld pool (90) that penetrates into the stack-up (10). The molten steel weld pool (90) is then grown to penetrate further into the stack-up (10) by increasing an irradiance of the laser beam (24) while reducing the projected sectional area (86) of the laser beam (24) at a plane of the top surface (20) of the workpiece stack-up (10). Increasing the irradiance of the laser beam (24) may be accomplished by moving a focal point (62) of the laser beam (24) closer to the top surface (20) or by reducing an angle of incidence (82) of the laser beam (24) so as to reduce the eccentricity of the projected sectional area (86) of the laser beam (24).
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