铝合金FSW过程中搅拌针前缘金属周期性流动行为研究

摘要

Studied the relative motion between friction stir and welding board of different parameters through high-speed photography, and also analyzed the metal flow during friction stir welding combined appearance of microstructure with transverse cross section and board. It could be divided into two stages which were platform stage and traverse stage in one periodical which equaled to the time that stir rotated one circle spent. In platform stage the function of stir pin was heating the front metal. As the result of this function formed specified thickness layer of visco-plastic metal. In feed stage the visco-plastic metal. In feed stage the visco-plastic front metal was carried integrally by stir pin.%利用高速摄像技术研究了搅拌摩擦焊过程中不同工艺参数条件下搅拌工具与被焊材料之间的相对运动,并结合焊核区金属组织形貌对搅拌针前缘金属流动行为进行分析.结果表明在搅拌摩擦焊接过程中搅拌工具与被焊接板材之间的相对运动存在着明显的周期性现象.并且搅拌针对其前缘金属作用的一个周期可分为两个阶段即平台阶段和进给阶段.在进给阶段前缘金属流动方式主要以整体流动的方式进行.