公开(公告)号：US20250010407A1

公开(公告)日：2025-01-09

申请号：US18756841

申请日：2024-06-27

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Nao KAWABE ,  Tomohiko SEKIGUCHI ,  Toru HIOKI ,  Tomoko OGASAHARA ,  Shota EJIMA ,  Takaya OBARA

IPC: B23K31/12 ,  B23K11/11 ,  B23K101/18 ,  B23K103/04 ,  G01B7/16

Abstract: To provide an inspection method by which a poorly-welded workpiece can be discriminated with high accuracy even under the presence of disturbances. According to the present disclosure, an inspection method for spot welding in which an electrical current is applied to electrodes that sandwich steel plates includes: calculating a contraction amount of the steel plates at the electrodes from a welding force and an inter-electrode displacement amount after the end of application of the electrical current to the electrodes, and determining that the spot welding is poor when the contraction amount is equal to or below a discrimination threshold.

公开(公告)号：US20240399511A1

公开(公告)日：2024-12-05

申请号：US18664994

申请日：2024-05-15

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Nao KAWABE ,  Tomohiko SEKIGUCHI ,  Toru HIOKI ,  Tomoko OGASAHARA ,  Shota EJIMA ,  Yosuke TAMADA ,  Takaya OBARA

IPC: B23K31/12 ,  B23K11/11 ,  B23K11/25

Abstract: A spatter detection method for accurately determining whether or not spatter has been generated when resistance spot welding is performed is provided. A spatter detection method including: a welding step for welding a plurality of welding materials by sandwiching parts to be welded of the welding materials between a pair of electrodes and then pressurizing the parts to be welded while simultaneously energizing the pair of electrodes; a calculation step for calculating an amount of expansion of the parts to be welded based on a pressurizing force and a stroke between the pair of electrodes; and a determination step for determining that the spatter has been generated when a magnitude of an inclination of an expansion amount waveform falls below a determination threshold, in which in the determination step, determination thresholds different from each other are applied to respective sections obtained by dividing a target period of the determination.

公开(公告)号：US20240353387A1

公开(公告)日：2024-10-24

申请号：US18632429

申请日：2024-04-11

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Yosuke TAMADA ,  Tomoko OGASAHARA ,  Tomohiko SEKIGUCHI

IPC: G01N33/207 ,  B23K11/11 ,  B23K11/16

CPC classification number: G01N33/207 ,  B23K11/16 ,  B23K11/115

Abstract: A spatter detection method in which the accuracy of detection of an occurrence of sputter is high, and a method for manufacturing a welded member are provided. A spatter detection method according to the present disclosure is a spatter detection method for detecting an occurrence of sputter in resistance spot welding, the resistance spot welding being welding in which a material to be welded, obtained by stacking a plurality of metal members on one another, is joined by sandwiching the material to be welded between a pair of electrodes and feeding an electric current therethrough, in which the occurrence of sputter is detected based on a change in a volume of a molten part of the material to be welded.

公开(公告)号：US20240391032A1

公开(公告)日：2024-11-28

申请号：US18663242

申请日：2024-05-14

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Shota EJIMA ,  Tomoko OGASAHARA ,  Tomohiko SEKIGUCHI ,  Toru HIOKI ,  Nao KAWABE ,  Takaya OBARA

IPC: B23K31/00 ,  B23K11/11 ,  B23K11/36

Abstract: A method of resistance spot welding comprises: preparing a machine learning model having learned a relation between a feature of a test data and a quality of a welding state of a test welding, the test data recording a time series change in an expansion amount of a workpiece in the test welding; and determining the quality of the welding state of a main welding using a main welding data and the machine learning model, the main welding data recording a time series change in an expansion amount of the workpiece in the main welding. The feature includes a first feature and a second feature, the first feature being with respect to a gradient of a change in an expansion amount of the workpiece during an expansion period in which the workpiece expands by energization, the second feature being with respect to a gradient of a change in an expansion amount of the workpiece during a contraction period in which the workpiece contracts after the expansion period.