This work aims to develop a reliable method to predict mechanical properties of friction-stir-welded 6xxx-series alloys with experimentally measured welding heat input. A calorimetrical method was utilized to experimentally measure the welding heat input in the friction stir welded of aluminum alloy 6063-T5. Good correlations between the input variables, i.e., welding parameters and physical properties of the materials, and the welding heat inputs obtained with experimental measurements were discovered. The welding heat input can be predicted using the empirical equation derived based on these correlations. Moreover, the results suggested that the thermal conductivities of the welded alloys affected the welding heat input significantly. Mechanical properties, including hardness and tensile properties, of friction-stir-welded aluminum alloy 6063 were in good correlation to the heat input obtained with experimental measurement. These correlations were explained by the evolution of the strengthening precipitates during welding. This work proposed a reliable new route to predict these mechanical responses through the estimation of heat input.

中文翻译：

---

用实验测量的焊接热输入预测搅拌摩擦焊接6063铝的拉伸性能

这项工作的目的是开发一种可靠的方法，以通过实验测量的焊接热量输入来预测搅拌摩擦焊接的6xxx系列合金的机械性能。利用量热法对铝合金6063-T5的摩擦搅拌焊接中的焊接热输入进行了实验测量。发现输入变量（即焊接参数和材料的物理特性）与通过实验测量获得的焊接热输入之间具有良好的相关性。可以使用基于这些相关性得出的经验方程式来预测焊接热输入。此外，结果表明，焊接合金的热导率显着影响焊接热输入。机械性能，包括硬度和拉伸性能，搅拌摩擦焊接铝合金6063的焊接强度与通过实验测量获得的热量输入具有良好的相关性。这些相关性可以通过焊接过程中强化沉淀的演变来解释。这项工作提出了一种可靠的新途径，可以通过估算热量输入来预测这些机械响应。