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公开(公告)号：US11045901B2
公开(公告)日：2021-06-29
申请号：US16133917
申请日：2018-09-18
发明人： Nicolai Speker , Marcel Schäfer , Philipp Scheible , Thomas Graf , Peter Stritt
摘要： A laser beam directed is moved relative to a workpiece to weld along a weld seam and form a weld pool in the area surrounding the laser beam. The weld pool has a characteristic oscillation frequency fco, and a laser power is modulated with a modulation frequency f and a modulation amplitude Π=1−Pmin/Pmax, where Pmin is minimal and Pmax is maximal laser power during a modulation period. For a normalized characteristic oscillation frequency Λco and a normalized modulation frequency Λ, Λ≥2.2*Λco, with Λ=f·df/ν, where ν is the feed rate of the laser beam, and df is diameter of a beam focal spot. Also, Λco=f,cotest·df,cotest/vcotest, where fcotest is a measured characteristic oscillation frequency, df,cotest the diameter of the beam focal spot, and vcotest is the feed rate of laser beam, all during a test measurement without modulation of the laser power.
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公开(公告)号：US20190039176A1
公开(公告)日：2019-02-07
申请号：US16133917
申请日：2018-09-18
发明人： Nicolai Speker , Marcel Schäfer , Philipp Scheible , Thomas Graf , Peter Stritt
摘要： A laser beam directed is moved relative to a workpiece to weld along a weld seam and form a weld pool in the area surrounding the laser beam. The weld pool has a characteristic oscillation frequency fco, and a laser power is modulated with a modulation frequency f and a modulation amplitude Π=1−Pmin/Pmax, where Pmin is minimal and Pmax is maximal laser power during a modulation period. For a normalized characteristic oscillation frequency Λco and a normalized modulation frequency Λ, Λ≥2.2*Λco, with Λ=f·df/ν, where ν is the feed rate of the laser beam, and df is diameter of a beam focal spot. Also, Λco=f,cotest·df,cotest/vcotest, where fcotest is a measured characteristic oscillation frequency, df,cotest the diameter of the beam focal spot, and vcotest is the feed rate of laser beam, all during a test measurement without modulation of the laser power.
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公开(公告)号：US11786989B2
公开(公告)日：2023-10-17
申请号：US17317925
申请日：2021-05-12
发明人： Patrick Haug , Nicolai Speker , Marco Opitz , Tim Hesse
IPC分类号： B23K26/035 , B23K26/244 , B23K26/06 , B23K26/32
CPC分类号： B23K26/035 , B23K26/0613 , B23K26/244 , B23K26/32
摘要： Laser beam welding a workpiece includes: generating first and second beam areas on the workpiece by first and second laser beams, respectively. The beam areas are guided in a feed direction relative to the workpiece. Centroids of the beam areas are not coinciding. The first beam area runs ahead of the second beam area. A length of the first beam area, measured transversely to the feed direction, is greater than or equal to that of the second. A surface area of the first beam area is greater than that of the second. A width of the first beam area, measured in the feed direction, is greater than or equal to that of the second. A laser power of the first laser beam is greater than that of the second. The second laser beam is irradiated into a weld pool generated by the first laser beam.
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公开(公告)号：US20230146425A1
公开(公告)日：2023-05-11
申请号：US17879830
申请日：2022-08-03
发明人： Robert Ganter , Tim Hesse , Kevin Kruse , Gerhard Link , Steven Mueller , Marco Opitz , Bjoern Sautter , Fabian Goetzelmann , Nicolai Speker , Franziska Horer , Anh-Thu Tran , Benedikt Wessinger
IPC分类号： B22F12/50 , B23K26/342 , B23K26/14 , B22F12/40 , B33Y30/00
CPC分类号： B22F12/50 , B22F12/40 , B23K26/342 , B23K26/1464 , B33Y30/00
摘要： A material deposition unit includes a radiation unit designed to emit electromagnetic radiation in a directed manner onto a workpiece along a beam axis, and a powder discharge device that has multiple powder discharge units configured to discharge powder in a directed form onto the workpiece through powder-outlet openings. The material deposition unit further includes a powder division unit having multiple powder channels. A number of powder channels corresponds to a number of powder discharge units. The powder division unit is designed to distribute a central powder stream guided to a feed channel uniformly over the powder channels. Each respective powder channel is connected to a respective powder discharge unit by an exchangeable connecting element. At least one powder discharge unit has an exchangeable powder discharge element, which is elongate, has a first end and a second end, and is arranged at least partially within the corresponding powder discharge unit.
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公开(公告)号：US11565348B2
公开(公告)日：2023-01-31
申请号：US16739658
申请日：2020-01-10
发明人： Nicolai Speker , Johannes Seebach
IPC分类号： B23K26/26 , B23K26/24 , B23K26/08 , B23K26/082
摘要： The disclosure relates to methods and systems for joining at least two workpieces, including forming a weld joint by moving a machining beam, e.g., a laser beam, and the at least two workpieces relative to one another along a feed direction, wherein the movement of the machining beam and the two workpieces relative to one another is superimposed with a periodic movement in a movement path, e.g., a two-dimensional movement path, which extends in a transverse direction perpendicularly to the feed direction and, e.g., additionally in the feed direction. The movement path has, between two reversal points in the transverse direction, at least one stop point at which a speed component of the periodic movement in the transverse direction is zero. The invention also relates to computer program products and systems for carrying out the methods.
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6.发明授权公开(公告)号：US11458574B2
公开(公告)日：2022-10-04
申请号：US16367325
申请日：2019-03-28
摘要： A laser cutting nozzle for a laser machining unit is described, the nozzle including a passage for the laser beam and cutting gas. The passage extends between a nozzle inlet and a nozzle mouth along a passage longitudinal axis. The passage comprises a convergence portion and a divergence portion. In the entire divergence portion, the wall of the passage forms an angle of inclination relative to the passage longitudinal axis of at most 5°. In addition, the length of the divergence portion is less than 5 times the diameter of the constriction.
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公开(公告)号：US20220266386A1
公开(公告)日：2022-08-25
申请号：US17741461
申请日：2022-05-11
IPC分类号： B23K26/073 , B23K26/12 , B23K26/244 , B23K26/26 , B23K26/06 , H01M50/516
摘要： A method for joining busbars includes reshaping a raw laser beam to obtain a reshaped laser beam. The reshaped laser beam comprises a core focus portion and at least one ring focus portion. The core focus portion and the ring focus portion are coaxial with respect to one another. The ring focus portion surrounds the core focus portion. The method further includes directing the reshaped laser beam to a plurality of busbars to weld the plurality of busbars to one another along at least one weld seam.
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公开(公告)号：US20190262942A1
公开(公告)日：2019-08-29
申请号：US16407411
申请日：2019-05-09
发明人： Patrick Haug , Nicolai Speker
IPC分类号： B23K26/242 , B23K26/06
摘要： The disclosure relates to methods and systems for deep welding a workpiece, a surface of the workpiece being irradiated by a first laser beam and a second laser beam. In a workpiece surface plane (OE) a first beam width B1 of the first laser beam is larger than a second beam width B2 of the second laser beam and in at least the workpiece surface plane (OE) the second laser beam lies inside the first laser beam. The intensity of the first laser beam alone is sufficient to produce a keyhole in the workpiece. The keyhole produced in the workpiece has a width KB in the workpiece surface plane (OE), KB substantially equaling B1, and B2≤0.75*KB. The methods and systems provide good seam quality, high penetration depth, and high welding speed.
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公开(公告)号：US20240033848A1
公开(公告)日：2024-02-01
申请号：US18484471
申请日：2023-10-11
发明人： Oliver Bocksrocker , Nicolai Speker , Tim Hesse
IPC分类号： B23K26/06 , B23K26/244 , B23K26/073 , H02K15/04
CPC分类号： B23K26/0626 , B23K26/244 , B23K26/0734 , H02K15/0414 , B23K2101/38
摘要： A method for welding bar-type conductors includes arranging at least two bar-type conductors in partially overlapping fashion, and welding the at least two bar-type conductors to one another by using a processing laser beam. The processing laser beam traverses a welding contour relative to the bar-type conductors. The traversing of the welding contour includes an initial phase, a main phase and an end phase. In the initial phase, in a partial region of a beam cross section of the processing laser beam, an intensity of the processing laser beam, which is spatially averaged over the partial region, is increased over time. In the main phase, the spatially averaged intensity, which is achieved at the end of the initial phase, is kept at least substantially constant over time. In the end phase, the spatially averaged intensity, starting from the intensity at the end of the main phase, is reduced over time.
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公开(公告)号：US20230068733A1
公开(公告)日：2023-03-02
申请号：US18054550
申请日：2022-11-11
发明人： Oliver Bocksrocker , Nicolai Speker
摘要： A method for monitoring an attachment area during laser welding of bent bar-type conductors containing copper, includes the steps of arranging a first bar-type conductor relative to a second bar-type conductor in partially overlapping fashion and welding the first and second bar-type conductors to one another using a processing laser beam, the welding including forming a weld bead interconnecting the bar-type conductors to one another. After the welding, at least one measurement variable is measured on at least one portion of the weld bead, wherein the at least one measurement variable changes with the temperature of the weld bead as a function of the time during a cooling down of the weld bead. A parameter depending on a heat capacity of the weld bead is determined from the at least one measured measurement variable, and the attachment area qualitatively or quantitatively determined from the parameter.
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