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公开(公告)号：US11548091B2
公开(公告)日：2023-01-10
申请号：US16598474
申请日：2019-10-10
IPC分类号： B23K11/16 , B23K11/11 , B23K11/20 , B23K103/20
摘要： A method of forming an assembly includes providing a metallic first workpiece having base and a first layer disposed on the base and adhering a second layer onto the first layer. One of the first and second layers is formed of a zinc-based material formed of at least a majority of zinc, and the other of the first and second layers is formed of a metallic alloying material having a melting point higher than the melting point of the zinc-based material. Preferably, the first layer is formed of the zinc-based material, and the second layer is formed of the metallic alloying material with the higher melting point. A metallic second workpiece is disposed in contact with the second layer. A welding operation is performed to join the first workpiece to the second workpiece. A welded assembly is also provided.
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公开(公告)号：US11441039B2
公开(公告)日：2022-09-13
申请号：US17127209
申请日：2020-12-18
摘要： A high temperature substrate coating to mitigate liquid metal embrittlement (LME) cracking in automobile vehicles includes a substrate. A coating is disposed on the substrate, the coating being one of a zinc-based material and an aluminum-based material, with the coating having a melting point of at least 500° C.
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3.发明授权公开(公告)号：US11318548B2
公开(公告)日：2022-05-03
申请号：US15952645
申请日：2018-04-13
摘要： A method of resistance spot brazing a workpiece stack-up that includes a first thin-gauge steel workpiece and a second thin-gauge steel workpiece. The method includes several steps. A first step involves applying a filler material to a surface of the first thin-gauge steel workpiece. A second step involves bringing a surface of the second thin-gauge steel workpiece to adjoin the filler material. A third step involves clamping a first welding electrode and a second welding electrode on the first and second thin-gauge steel workpieces and over the filler material. A fourth step involves passing electrical current between the first and second welding electrodes and hence through the filler material. And a fifth step involves terminating passage of the electrical current in order to establish a brazed joint between the first and second thin-gauge steel workpieces.
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4.发明申请公开(公告)号：US20190314915A1
公开(公告)日：2019-10-17
申请号：US15952813
申请日：2018-04-13
摘要： A method of resistance spot welding a workpiece stack-up that includes a first steel workpiece and a second steel workpiece. The method includes several steps. The first steel workpiece can have a first surface coating. One step involves applying a filler metal to a surface of the first steel workpiece. Another step involves bringing a surface of the second steel workpiece to adjoin the filler metal. Yet another step involves clamping a first welding electrode and a second welding electrode on the first and second steel workpieces. And another step involves passing electrical current between the first and second welding electrodes and hence through the filler metal. And yet another step involves terminating passage of the electrical current in order to establish a weld joint between the first and second steel workpieces.
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公开(公告)号：US20170304928A1
公开(公告)日：2017-10-26
申请号：US15492482
申请日：2017-04-20
IPC分类号： B23K11/31 , B23K11/20 , B23K11/11 , B23K11/30 , B23K11/24 , B23K103/20 , B23K103/04 , B23K103/10
摘要： A method of resistance spot welding workpiece stack-ups of different combinations of metal workpieces with a single weld gun using the same set of welding electrodes is disclosed. In this method, a set of opposed welding electrodes that include an original shape and oxide-disrupting structural features are used to resistance spot weld at least two of the following types of workpiece stack-ups in a particular sequence: (1) a workpiece stack-up of two or more aluminum workpieces; (2) a workpiece stack-up that includes an aluminum workpiece and an adjacent steel workpiece; and (3) a workpiece stack-up of two or more steel workpieces. The spot welding sequence calls for completing all of the aluminum-to-aluminum spot welds and/or all of the steel-to-steel spot welds last.
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公开(公告)号：US11045894B2
公开(公告)日：2021-06-29
申请号：US15953546
申请日：2018-04-16
摘要： Aluminum-base alloy workpieces have surfaces with films of aluminum oxide which inhibit good contact with weld faces of resistance spot weld electrodes and the faying surfaces of, for example, sheet workpieces stacked for welding. Sometimes, the surfaces of the sheets also are coated with an adhesive or a sealer which further complicates welding. But in accordance with this invention, weld faces of opposing, round, copper welding electrodes are pressed against opposite outside surfaces of the sheets at a spot weld site and weld current is applied to the electrodes in accordance with a three-stage weld schedule to better form each weld. The weld schedule comprises a Conditioning stage (stage 1), a weld nugget Shaping stage (stage 2), and a weld nugget Sizing stage (stage 3).
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7.发明申请公开(公告)号：US20200016679A1
公开(公告)日：2020-01-16
申请号：US16034712
申请日：2018-07-13
摘要： A method to mitigate liquid metal embrittlement cracking in resistance welding of galvanized steels includes modifying at least one face of a steel member to create a first workpiece by: applying a zinc containing material in a first layer to the at least one face of the steel member; and spraying a second layer of a copper containing material onto the first layer of the zinc containing material. The at least one face of the first workpiece is abutted to a second workpiece of a steel material. A resistance welding operation is performed to join the first workpiece to the second workpiece. A temperature of the resistance welding operation locally melts the zinc containing material and the copper containing material to create a brass alloy of the zinc containing material and the copper containing material.
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公开(公告)号：US10272515B2
公开(公告)日：2019-04-30
申请号：US14854467
申请日：2015-09-15
IPC分类号： B23K11/11 , B23K11/16 , B23K103/04
摘要： A method of resistance spot welding steel workpieces—at least one of which includes a high-strength steel substrate having a tensile strength of 1000 MPa or greater—involves passing a pulsating DC electrical current between a pair of aligned welding electrodes that are pressed against opposite sides of a workpiece stack-up that includes the steel workpieces. The pulsating DC electrical current delivers sufficient power through the weld site by way of electrical current pulses to initiate and grow a molten steel weld pool at each faying interface within the workpiece stack-up that solidifies into a weld nugget of uniform hardness. In other words, each of the weld nuggets formed by the pulsating DC electrical current does not include soft, coarse, and alloy deficient shell regions that tend to reduce the strength of the weld nugget.
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公开(公告)号：US20190076955A1
公开(公告)日：2019-03-14
申请号：US16181809
申请日：2018-11-06
发明人： Hui-ping Wang , David R. Sigler , Blair E. Carlson , Amberlee S. Haselhuhn , Michael J. Karagoulis
摘要： A welding electrode includes a weld face that has a convex base weld face surface and a plurality of ringed ridges that are radially spaced apart on the base weld face surface and surround a central weld face axis. The plurality of ringed ridges including an innermost ringed ridge and an outermost ringed ridge. The innermost ringed ridge is located closest to the central weld face axis and rises above a central portion of the base weld face surface, and the outermost ringed ridge is located farthest from the central weld face axis and rises above an outer peripheral portion of the base weld face surface. At least one of the plurality of ringed ridges is a discontinuous ringed ridge.
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公开(公告)号：US20180272457A1
公开(公告)日：2018-09-27
申请号：US15992748
申请日：2018-05-30
IPC分类号： B23K11/20 , B23K35/02 , B23K11/11 , B23K11/30 , B23K103/20
CPC分类号： B23K11/20 , B23K11/115 , B23K11/3009 , B23K11/3018 , B23K35/0205 , B23K35/0261 , B23K2103/20
摘要： A method of spot welding a workpiece stack-up that includes a steel workpiece and an aluminum alloy workpiece involves passing an electrical current through the workpieces and between welding electrodes that are constructed to affect the current density of the electrical current. The welding electrodes, more specifically, are constructed to render the density of the electrical current greater in the steel workpiece than in the aluminum alloy workpiece. This difference in current densities can be accomplished by passing, at least initially, the electrical current between a weld face of the welding electrode in contact with the steel workpiece and a perimeter region of a weld face of the welding electrode in contact with the aluminum alloy workpiece.
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