Effects of water cooling of friction stir welding of magnesium alloy stiffness joint

IF 3.8 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
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Abstract

This study presents a comparative analysis of friction stir welding (FSW) and underwater friction stir welding (UFSW) of AZ31 magnesium alloy in T-configuration, emphasizing the effects on heat distribution, material properties, and mechanical performance. Simulation results revealed a more uniform heat distribution in both welding techniques, with the hottest area on the advancing side. The maximum temperatures recorded at the shoulder-workpiece contact were 404 °C for FSW and 349 °C for UFSW, a 13.6 % reduction in UFSW. Material velocity at the trailing edge was 63 mm/s for FSW and 42 mm/s for UFSW, showing a 34 % decrease due to lower heat generation in UFSW. Strain rates were 450 s⁻¹ for FSW and 420 s⁻¹ for UFSW. Grain size in the stir zone was 26 micrometers for FSW and 21 micrometers for UFSW, a 19 % reduction. Ultimate tensile strength (UTS) increased by 6 % in the skin direction and 12.8 % in the flange direction for UFSW compared to FSW. SEM analysis indicated enhanced ductility in UFSW fractures. These results demonstrate UFSW's superiority in improving thermal management, microstructural properties, and mechanical performance of welded joints.
镁合金刚度接头搅拌摩擦焊的水冷效果
本研究对 T 型结构的 AZ31 镁合金的搅拌摩擦焊(FSW)和水下搅拌摩擦焊(UFSW)进行了比较分析,强调了对热分布、材料性能和机械性能的影响。模拟结果表明,两种焊接技术的热量分布都比较均匀,最热的区域在推进侧。在肩部与工件接触处记录到的最高温度,FSW 为 404 ℃,UFSW 为 349 ℃,UFSW 降低了 13.6%。后缘处的材料速度,FSW 为 63 mm/s,UFSW 为 42 mm/s,由于 UFSW 的发热量较低,材料速度降低了 34%。FSW 的应变速率为 450 s-¹,UFSW 为 420 s-¹。FSW 和 UFSW 的搅拌区晶粒尺寸分别为 26 微米和 21 微米,减少了 19%。与 FSW 相比,UFSW 在表皮方向的极限拉伸强度(UTS)提高了 6%,在凸缘方向提高了 12.8%。SEM 分析表明,UFSW 断口的延展性增强。这些结果表明 UFSW 在改善焊接接头的热管理、微观结构特性和机械性能方面具有优越性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
7.10
自引率
9.80%
发文量
58
审稿时长
44 days
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