Resistance element welding of magnesium alloy and austenitic stainless steel in three-sheet configurations

Manladan, Sunusi Marwana and Zhang, Y. and Ramesh, Singh and Cai, Yang Chuan and Ao, Sansan and Luo, Zhen (2019) Resistance element welding of magnesium alloy and austenitic stainless steel in three-sheet configurations. Journal of Materials Processing Technology, 274. p. 116292. ISSN 0924-0136

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Official URL: https://doi.org/10.1016/j.jmatprotec.2019.116292

Abstract

The Mg alloy and two austenitic stainless steel sheets were joined together by a metallurgical bond across the rivet and two austenitic stainless steel sheets. More heat was generated at the austenitic stainless/austenitic stainless interface than at the rivet/ austenitic stainless steel interface, leading to larger nugget size at the austenitic stainless steel /austenitic stainless steel interface at all welding currents. Thus, the nugget size at the austenitic stainless steel /austenitic stainless steel interface mainly influenced the transition from interfacial to pullout failure modes. The fusion zone microstructure consisted of ferrite and austenite. The microstructure in the edges of the nugget (both in the rivet and ASS) consisted of fine columnar dendritic grains. Owing to variation of temperature gradient and solidification growth rate, the grains morphology changed from columnar dendritic to equiaxed dendritic in the nugget center. The fine grains resulted in high fusion zone hardness. Digital image correlation analysis revealed that the joints could experience joining zone rotation/out-of-plane displacement during lap-shear tests, which reduced the magnitude of strain sustained by the joints in the loading direction. The joint configuration that did not undergo joining zone rotation and failed via pullout failure in the austenitic stainless steel sheet exhibited superior lap-shear performance. © 2019

Item Type: Article
Uncontrolled Keywords: Resistance element welding; Resistance spot welding; Multi-sheet joining; Magnesium alloy; Austenitic stainless steel
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 19 Mar 2020 05:57
Last Modified: 19 Mar 2020 05:57
URI: http://eprints.um.edu.my/id/eprint/24059

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