铝合金搅拌摩擦焊接工艺参数对焊接温度的影响

摘要

搅拌摩擦焊是一种新型的、绿色环保、高效的固相焊接技术，其过程涉及由轴肩和搅拌针构成的无损耗搅拌工具。焊接过程中，高速旋转的搅拌工具插入到工件表面直至轴肩与工件接触，并沿焊缝向前行进，利用搅拌工具与工件产生的摩擦热使待焊材料塑化，并在搅拌工具的带动下产生流动与混合从而实现焊接。详细分析了搅拌摩擦焊接的微观组织结构，搅拌工具以及主要工艺参数对焊接的影响并通过试验研究了主轴转速、焊接速度以及轴肩下压量对焊接温度的影响。试验研究表明，主轴转速和焊接速度对焊接温度的影响较大，下压量对焊接温度的影响不大。%Friction Stir Welding ( FSW) is a new solid-state welding technique with green environmental protection and high efficien-ly. This non-consumable tool consists of a shoulder and a pin. In the FSW process, a high-speed spinning tool is inserted into the workpiece until the shoulder contacts with the workpiece and travels forward along the line of the joint. The heat produced by the fric-tion between the tool and the workpiece makes the material plastic, which is able to flow along with the tool to accomplish welding. In this article, the microstructure of FSW weld and the effect of FSW tool and parameters on welding quality are described. The influ-ence of tool rotation speed, traverse speed and insertion depth on welding temperature is studied through experiments. The results show the impact of tool rotation speed and traverse speed on welding temperature is great, but the effect of the insertion depth on temperature is not.