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采用中心组合设计响应面方法对AA5052-H32铝板间的搅拌摩擦焊过程进行优化。研究发现,焊接参数如搅拌头形状、搅拌头转速、焊接速度和搅拌头倾斜角对接头性能起着决定作用。采用方锥形搅拌头,在搅拌头转速为600 r/min、焊接速度为65 mm/min和搅拌头倾角为1.5°时,得到最优的焊接效率93.51%。开发数学模型描述焊接参数和响应变量(极限抗拉强度和伸长率)间的关系,并对模型进行优化,以最大限度地提高搅拌摩擦焊接头的极限抗拉强度。利用数学模型生成响应曲线以解释焊接参数对响应变量的相互影响,并采用方差分析(ANOVA)验证模型的可靠性。结果表明,实验数据与预测模型吻合较好。通过观察焊缝的微观和宏观结构,研究焊缝不同区域的晶粒组织。
The center combination design response surface method was used to optimize the friction stir welding process between AA5052-H32 aluminum plates. The study found that the welding parameters such as stirrer shape, stirrer speed, welding speed and stirrer tilt angle of the joint performance plays a decisive role. The square taper was used to obtain the best welding efficiency of 93.51% when the rotating speed of the mixing head was 600 r / min, the welding speed was 65 mm / min and the inclination angle of the mixing head was 1.5 °. Develop mathematical models that describe the relationship between welding parameters and response variables (ultimate tensile strength and elongation) and optimize the model to maximize the ultimate tensile strength of a friction stir welded joint. Response curves were generated using mathematical models to explain the interaction between welding parameters and response variables, and the analysis of variance (ANOVA) was used to verify the reliability of the model. The results show that the experimental data are in good agreement with the prediction model. By observing the microstructure and macro-structure of the weld, the grain structure in different regions of the weld is studied.