搅拌摩擦焊工艺参数对LY12铝合金焊缝金属流动形态的影响

采用铝箔作为标示材料,研究了旋转速度、焊接速度、下压量等工艺参数对LY12铝合金搅拌摩擦焊焊缝金属流动形态的影响.结果表明:焊缝金属的流动形态由4个特征区域组成,即水平流动区、紊流区、"洋葱环"区和刚塑性迁移区;搅拌摩擦焊的焊缝关于中心不对称,返回边标示材料的变形程度比前进边的大;随着旋转速度的提高,金属在焊缝厚度方向向上的迁移量先增大后减小;随着焊接速度的提高,金属向上迁移的最大位移减小;增大下压量,有利于金属的流动和焊缝致密度的提高.

Effects of Process Parameters on Flow Pattern of LY12 Aluminum Alloy during Friction Stir Welding

Using the aluminum foil as a tracer material,friction stir welding was conducted with different process parameters.The effect of rotating velocity,welding speed and plunge depth on the weld transverse section morphology was studied.The results showed that the metal flow in the weld was composed of four characteristic zones,i.e.,flow zone,turbulence zone,onion zone and rigid plastic transfer zone.The weld was unsymmetric about the center line,and the deformed intensity of the tracer material on the retreatin...