Hierarchical Morphology and Formation Mechanism of Collision Surface of Al/Steel Dissimilar Lap Joints via Electromagnetic Pulse Welding

Puquan Wang; Daolun Chen; Yunqi Yan; Xinwei She; Bo Feng; Yang Ran; He Peng; Dongyang Li; Xianquan Jiang

doi:10.3390/met11091468

Metals (Sep 2021)

Hierarchical Morphology and Formation Mechanism of Collision Surface of Al/Steel Dissimilar Lap Joints via Electromagnetic Pulse Welding

Puquan Wang,
Daolun Chen,
Yunqi Yan,
Xinwei She,
Bo Feng,
Yang Ran,
He Peng,
Dongyang Li,
Xianquan Jiang

Affiliations

Puquan Wang: College of Materials and Energy, Southwest University, Tiansheng Road 2, Beibei District, Chongqing 400715, China
Daolun Chen: Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, ON M5B 2K3, Canada
Yunqi Yan: Department of Mechanical and Engineering, Sichuan University of Science and Engineering, Huixing Road 519, Zigong 643000, China
Xinwei She: College of Materials and Energy, Southwest University, Tiansheng Road 2, Beibei District, Chongqing 400715, China
Bo Feng: Guangdong Institute of Materials and Processing, Changxing Road 363, Tianhe District, Guangzhou 510630, China
Yang Ran: Institute of Optics and Mechanics, Chongqing Academy of Science and Technology, Yangliu Road 2, Chongqing 401123, China
He Peng: College of Engineering and Technology, Southwest University, Tiansheng Road 2, Beibei District, Chongqing 400715, China
Dongyang Li: Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 2H5, Canada
Xianquan Jiang: College of Materials and Energy, Southwest University, Tiansheng Road 2, Beibei District, Chongqing 400715, China

DOI: https://doi.org/10.3390/met11091468
Journal volume & issue: Vol. 11, no. 9
p. 1468

Abstract

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The aim of this study was to characterize detailed microstructural changes and bonding characteristics and identify the formation mechanism of collision surface of Al6061–Q355 steel dissimilar welded joints via electromagnetic pulse welding (EMPW). The collision surface was observed to consist of five zones from the center to the outside. The central non-weld zone exhibited a concave and convex morphology. The welding-affected zone mainly included melting features and porous structures, representing a porous joining. The secondary weld zone presented an obvious mechanical joining characterized by shear plateaus with stripes. The primary weld zone characterized by dimples with cavity features suggested the formation of diffusion or metallurgical bonding. The impact-affected zone denoted an invalid interfacial bonding due to discontinuous spot impact. During EMPW, the impact energy and pressure affected the changes of normal velocity and tangential velocity, and in turn, influenced the interfacial deformation behavior and bonding characteristics, including the formation of micropores which continued to grow into homogeneous or uneven porous structures via cavitation, surface tension, and depressurization, along with the effect of trapped air.

Published in Metals

ISSN: 2075-4701 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Mining engineering. Metallurgy
Website: http://www.mdpi.com/journal/metals

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