Improving the weldability and mechanical property of ultrasonic spot welding of Cu sheets through a surface gradient structure

Ni, Zenglei; Ma, J.S.; Назаров, А. А.; Yuan, Zhipeng; Wang, X.X.; Ao, Sansan; Ji, Hongjun; Guo, Peng; Qin, Jian

doi:10.1016/j.jmrt.2025.03.301

articleJournal of Materials Research and TechnologyApr 4, 2025GOLD OA

Improving the weldability and mechanical property of ultrasonic spot welding of Cu sheets through a surface gradient structure

ZNZenglei Ni JMJ.S. Ma ААА. А. Назаров ZYZhipeng Yuan XWX.X. Wang

North China University of Water Resources and Electric Power · Institute of Metal Superplasticity Problems · +3 more institutions

Indexed incrossrefdoaj

Abstract

The weldability of metal sheets decreases with the increase of thickness during ultrasonic spot welding. To enhance the weldability and mechanical strength of ultrasonic spot welding of original Cu (O–Cu) sheets, a surface gradient structure (SG-Cu) was designed. The optimized SG-Cu sheets exhibited a 6 μm-thick nanocrystalline layer with an average grain size of 780 nm near the surface, accompanied by a substantial reduction in friction coefficient. Microstructural characterization showed that the improved metallurgical bonding originated from discontinuous dynamic recrystallization at the welded interface, which produced randomly oriented fine equiaxed grains with active grain boundary migration. The welding…

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52

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Percentile: 100%
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Topics & keywords

Topics

Keywords

Weldability
Materials science
Welding
Spot welding
Ultrasonic sensor
Metallurgy
Property (philosophy)
Composite material

UN Sustainable Development Goals

Affordable and clean energy

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