Title: Improved mechanical properties of steel/aluminium laser welding joint by Ti powder addition: experimental and first-principles investigations

Authors: Dianwu Zhou

Addresses: State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China

Abstract: The generation of brittle intermetallic compounds (IMCs) need be solved for steel/aluminium welding quality. In this study, Ti powder was selected as interlayer and the experiments of laser penetration welding for steel/aluminium through addition of interlayer were carried out. The effect of adding Ti powder on mechanical properties of the weld was investigated. Experimental results showed that the increased penetration depth was obtained, and the average tensile-shear strength of Ti-added joint was 10% higher than that of no-added joint. First-principle calculations revealed that the effect of reduced brittleness of IMCs with the addition of alloying elements was in accordance with the improved mechanical properties. When Ti powder was added, the grain was small, the layer thickness and brittleness of IMCs decreased, ductile phase Fe₂Ti were formed. Hence, mechanical properties of the weld were significantly improved. [Submitted 14 March 2019; Accepted 10 February 2021]

Keywords: laser welding; powder; micro-structure; mechanical properties.

DOI: 10.1504/IJMR.2024.136556

International Journal of Manufacturing Research, 2024 Vol.19 No.1, pp.20 - 35

Accepted: 10 Feb 2021
Published online: 07 Feb 2024 *

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