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：US20220297224A1

公开(公告)日：2022-09-22

申请号：US17649946

申请日：2022-02-04

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Yosuke TAMADA ,  Kyosuke IZUNO ,  Tomohiko SEKIGUCHI ,  Shuhei OGURA ,  Chikaumi SAWANISHI

IPC: B23K11/11 ,  B23K11/25

Abstract: A welding determination method is provided, which determines whether a spot welding part is joined to an electrode without using resistance generated when separating the electrode from a workpiece. In the method, the workpiece made by laminating multiple metal sheets is clamped under pressure by a pair of electrodes and melted by a current applied, and after that the conduction is stopped to hold the workpiece in a pressurized state to determine whether the joining occurs. The method includes the steps of: deriving resistance between the pair of electrodes and pressurizing force by the pair of electrodes during conduction to the workpiece; and determining whether the spot welding part is joined to the electrodes based on a first index value calculated using the derived resistance and resistance in an ideal welding, and on a second index value calculated using the derived pressurizing force and pressurizing force in the ideal welding.