【摘要】 为了研究激光-等离子弧复合焊接熔池的流动特性,该文建立了焊接过程中液相区、糊状区和固相区的三维模型,采用体热源来模拟小孔效应,并利用有限控制容积法计算了复合焊接熔池的流场和温度场,重点研究了表面张力和电磁力的作用。数值分析结果表明:表面张力流是决定复合焊熔池流动的主要原因,是影响焊接成形的主要因素;与表面张力流相比,电磁力流的强度较低,但可增加熔深和下表面熔宽。针对1420铝锂合金的复合焊工艺试验表明计算结果与试验相符合。更多还原

【Abstract】 The effect of surface tension and the electromagnetic force on the flow in a laser-plasma hybrid weld pool was investigated numerically using a threedimensional model that included the liquid zone,mushy zone and solid zone.The keyhole effect was simulated by a volumetric heat source.The velocity and temperature distributions in the weld pool are calculated by the finite volume method.The simulation results show that the surface tension determines the flow pattern while the electromagnetic force can widen the bottom surface of the weld pool.The predicted results agree well with experimental results for a hybrid welding experiment on 1420 Al-Li alloy.更多还原