公开(公告)号：US20240011756A1

公开(公告)日：2024-01-11

申请号：US18143929

申请日：2023-05-05

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Shuhei OGURA ,  Tomohiko SEKIGUCHI ,  Kyosuke IZUNO ,  Yuki MATSUGI ,  Shota EJIMA ,  Yasuaki OKITA ,  Mizuki KODAMA

IPC: G01B7/12 ,  G01B7/06 ,  B23K11/11

CPC classification number: G01B7/12 ,  G01B7/06 ,  B23K11/11

Abstract: Resistance spot welding includes a first process of performing energization by pressurizing two or more metal plates superposed by sandwiching a pair of electrode tips, and a second process of stopping energization in the first process and pressurizing two or more metal plates by a pair of electrode tips. The estimation method for the nugget diameter includes: a thickness estimation process of estimating the nugget thickness using the amount of expansion in the thickness direction of two or more metal plates in the first process and the electric resistance value between the pair of electrode tips in the first process; and a diameter estimation process of estimating the nugget diameter using the expansion amount and the electric resistance value when the nugget is estimated to have reached the interface between two adjacent metal plates using the respective thicknesses of the two or more metal plates and the estimated nugget thickness.

公开(公告)号：US20250153279A1

公开(公告)日：2025-05-15

申请号：US18859051

申请日：2023-04-26

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Shuhei OGURA ,  Tomohiko SEKIGUCHI ,  Kyosuke IZUNO ,  Yuki MATSUGI ,  Yasuaki OKITA ,  Mizuki KODAMA

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

Abstract: A nugget diameter estimation method of a welded material bonded by resistance spot welding includes: a reference welding process of bonding a test material while measuring an expansion amount of the test material; a nugget diameter measurement process of measuring a nugget diameter of the bonded test material; a relational formula determination process of determining a relational formula between the measured nugget diameter of the test material and the expansion amount of the test material; a main welding process of measuring an expansion amount of the welded material, and bonding the welded material through energization while pressurizing the welded material with the pair of electrodes; and a nugget diameter estimation process of estimating a nugget diameter of the bonded welded material using the expansion amount of the welded material and the relational formula.