Study on Mechanical Behaviors in Friction Stir Welding of 6061-T4 T-Joints

Abstract:

Friction stir welding (FSW) of T-joints composed by 3mm thick 6061-T4 alloy was presented and the influences of process parameters on hardness profiles and tensile strength were discussed specifically. Two low hardness zones on the skin and one low hardness zone on the stringer were found. Tensile behaviors of T-joints were examined in two directions—in skin direction and in stringer direction. It was found that the tensile strength ranged from 170~180MPa for all specimens in the skin direction. And the specimens failed in heat affected zone (HAZ) corresponding to the lowest hardness. In the stringer direction, most fractures occurred in the stringer. In all the cases, the specimens welded exhibited the best tensile strength with ω/v=1541/218 in the stringer direction. The ultimate tensile strength was equal to 83% compared to base material.

• Periodical: Advanced Materials Research (Volumes 418-420)
• Pages: 1092-1096
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.418-420.1092
• Online since: December 2011
• Authors: Guang Zhou, Xin Qi Yang, Xiao Dong Xu
• Keywords: Friction Stir Welding (FSW), Hardness, Tensile Strength, T-Joint

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