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Effects of friction stir welding parameters on the mechanical properties of AA7075-T6

Hao D. D., Tra T. H.

Archives of Materials Science and Engineering

2016

Vol. 77, nr 2

58--64

Purpose: In this paper, the mechanical properties of welded joints of AA7075-T6 obtained using friction stir welding (FSW) with five regimes of ratio of tool rotation speed to weld speed (3.0, 4.0, 7.5, 10.0 and 15.0 rev/mm) are investigated. Design/methodology/approach: FSW welds were fabricated by Friction stir welding machine. The properties of FSW and were identified using temperature and hardness distribution, microstructure, and tensile strength. Findings: The weld heat and grain size rise when the ratio ω/ν or ω is increased. Tensile strength of welded joint is increased when the ratio ω/ν is elevated. An FSW joint can be obtained with the highest tensile strength and strain of about 76% in comparison with that of the base metal. In all cases, tensile fractures take place outside the stirred zone and are locate in either the retreating or advancing side where hardness is the lowest. Research limitations/implications: The paper researches about properties of FSW of AA7075-T6 that focus on tensile strength and some elements relation such as: temperature and hardness distribution, microstructure. Originality/value: The results show that the mechanical properties of AA7075-T6 depended on friction stir welding parameters.