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Mechanical properties of friction stir butt-welded Al-5086 H32 plate

机译:搅拌摩擦焊接Al-5086 H32板的力学性能。

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摘要

Al-5086 H32 plates with a thickness of 3 mm were friction stir butt-welded using different welding speeds at a tool rotational speed of 1600 rpm. The effect of welding speed on the weld performance of the joints was investigated by conducting optical microscopy, microhardness measurements and mechanical tests (i.e. tensile and bend tests). The effect of heat input during friction stir welding on the microstructure, and thus mechanical properties, of cold-rolled Al- 5086 plates was also determined.rnThe experimental results indicated that the maximum tensile strength of the joints, which is about 75 % that of the base plate, was obtained with a traverse speed of 200 mm/min at the tool rota-rntional speed used, e.g. 1600 rpm, and the maximum bending angle of the joints can reach 180°. The maximum ductility performance of the joints was, on the other hand, relatively low, e.g. about 20%. These results are not unexpected due to the loss of the cold-work strengthening in the weld region as a result of the heat input during welding, and thus the confined plasticity within the stirred zone owing to strength undermatching. Higher joint performances can also be achieved by increasing the penetration depth of the stirring probe in butt-friction stir welding of Al-5086 H32 plates.
机译:将厚度为3 mm的Al-5086 H32板以不同的焊接速度在1600 rpm的工具转速下进行摩擦搅拌对焊。焊接速度对接头焊接性能的影响通过光学显微镜,显微硬度测量和机械测试(即拉伸和弯曲测试)进行了研究。还确定了摩擦搅拌焊接过程中的热量输入对冷轧Al-5086板材的组织和力学性能的影响。实验结果表明,接头的最大抗拉强度约为合金的最大抗拉强度的75%。在所使用的工具旋转速度下,以200 mm / min的移动速度获得基板,例如1600 rpm,关节的最大弯曲角度可达到180°。另一方面,关节的最大延展性能相对较低,例如,小于或等于1。约20%这些结果并非意外,这是由于焊接过程中的热量输入导致焊接区域的冷作强度损失,以及由于强度不匹配而在搅拌区内产生的可塑性有限。在Al-5086 H32板的对接摩擦搅拌焊接中,增加搅拌探针的穿透深度也可以实现更高的接头性能。

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