Abstract
Submerged friction stir welding on magnesium (Mg) alloy is investigated with limits in the past. ME20M is an important lightweight Mg alloy with enhanced yield strength and heat resistance that merits further research. In this paper, submerged friction stir welding of ME20M Mg alloy was carried out in different temperatures of cooling water. Three-dimensional numerical was employed to analyze the thermal field under the same weld conditions, and the numerical predictions were compared with the experimental results. The macrostructure, microstructure, tensile properties, and hardness are tested. The results show that the numerical results and the experimental results exhibits the same trends. By increasing the cooling water temperature, the grain size of the weld nugget increased, the tensile strength of the joint decreased, and the microhardness of the weld joint decreased. The largest tensile strength was 170.5 MPa, which was ~ 71.04% of the base metal. The highest and the lowest hardness values of the weld joint were obtained at the cooling water temperature of 15 °C and 75 °C, respectively, in the weld nugget and heat-affected zones.
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The study work of this paper is supported by the National Natural Science Foundation of China (Grant No. 51475232).
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Liu, W., Yan, Y., Sun, T. et al. Influence of cooling water temperature on ME20M magnesium alloy submerged friction stir welding: a numerical and experimental study. Int J Adv Manuf Technol 105, 5203–5215 (2019). https://doi.org/10.1007/s00170-019-04496-2
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DOI: https://doi.org/10.1007/s00170-019-04496-2