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建立了激光等离子弧复合焊接过程中液相区、糊状区和固相区的统一模型,在模型中同时考虑了表面张力、热浮力和电磁力的作用,通过数值计算得到了熔池的速度场和温度场,重点研究了电磁力对熔池流动和传热的影响。结果表明,在熔池形成的初始阶段,表面张力对熔池中的对流和传热起主要作用,而电磁力的作用受到抑制,随着熔深增加,电磁力作用增强并引起涡旋,导致熔深和下表面熔宽增加。针对1420铝锂合金的复合焊工艺试验表明计算结果与实际相符合。
The unified model of liquid-phase, paste-like and solid-phase regions in laser plasma arc welding was established. The effects of surface tension, thermal buoyancy and electromagnetic force were considered simultaneously in the model. The velocity of molten pool Field and temperature field, focusing on the electromagnetic force on the pool flow and heat transfer. The results show that the surface tension plays a major role in the convection and heat transfer in the molten pool in the initial stage of pool formation, and the electromagnetic force is suppressed. As the penetration depth increases, the electromagnetic force enhances and causes vortexes. The penetration depth and lower surface melt width increase. The composite welding process test for 1420 Al-Li alloy shows that the calculation results are in accordance with the actual ones.