Effects of Multi-Pass Butt-Upset Cold Welding on Mechanical Performance of Cu-Mg Alloys.

ABSTRACT: Joining high-strength, cold-drawn Cu-Mg alloy conductors is a critical challenge for ensuring the reliability of high-speed railway catenary systems. This study investigates the evolution of mechanical properties and microstructure in Cu-0.43 wt% Mg alloy wires joined by multi-pass butt-upset cold welding without special surface preparation. High-integrity joints were achieved, exhibiting a peak tensile strength of 624 MPa (~96% of the base material's strength). After four upsetting processes, the tensile strength of the weld can reach 90% of the original strength, and the gains from subsequent upsetting processes are negligible. Microstructural analysis revealed the joining process is governed by localized severe shear deformation, which forges a distinct gradient microstructure. This inc

SUBMITTER: Yuan Y 

PROVIDER: S-EPMC12734783 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature