公开(公告)号：US20240375206A1

公开(公告)日：2024-11-14

申请号：US18314315

申请日：2023-05-09

Applicant: GM Global Technology Operations LLC

Inventor： Huaxin Li ,  Pankaj Kumar Jha ,  Lala Ram Patel ,  Yi Liu

IPC: B23K11/11

Abstract: A method of joining overlapping copper workpieces. The method includes overlapping a first copper workpiece with a second copper workpiece such that a plurality of projections on a second faying surface of the second copper workpiece are in contact with the first faying surface of the first copper work piece at a joining location where a metallurgical joint is ultimately established. The method further includes applying a compression force against a first exterior surface of the first copper workpiece and a second exterior surface of the second copper workpiece to urge the faying surfaces together, and passing an electric current at the joining location through the first and the second copper workpieces. The electric current flows through the plurality of projections to generate sufficient heat to effectuate the collapsing of the plurality of projections to bring the first second faying surfaces into contact to establish the metallurgical joint.

公开(公告)号：US20250153275A1

公开(公告)日：2025-05-15

申请号：US18505600

申请日：2023-11-09

Applicant: GM Global Technology Operations LLC

Inventor： Huaxin Li ,  Pankaj Kumar Jha ,  Kaushik Kalita ,  Yi Liu ,  Qigui Wang ,  Lala Ram Patel ,  Masoud MohammadPour

IPC: B23K26/26 ,  F16B5/08

Abstract: Systems, methods, and assemblies for forming or employing closed-loop laser-welds are described. Closed-loop laser-welds may be formed by, for example, actuating a laser on a substrate at a first point to initiate a weld and scanning the laser along a starting weld path, along a main weld path, and along an ending weld path. The starting weld path is from the first point to a second point. The main weld path is from the second point to a third point. The ending weld path is from the third point to a fourth point. The laser is scanned from the second point to the third point such that a bead of the main weld path defines an inner perimeter and an outer perimeter. The outer perimeter defines a closed-loop laser weld. The first point and the fourth points are within the inner perimeter.