| 激光-等离子弧复合焊接熔池流动和传热的数值分析 |
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| 引用本文： | 李志宁,都东,常保华,王力.激光-等离子弧复合焊接熔池流动和传热的数值分析[J].焊接学报,2007,28(7). |
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| 作者姓名： | 李志宁 都东 常保华 王力 |
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| 作者单位： | 清华大学,先进成形制造教育部重点实验室,北京,100084 |
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| 基金项目： | 教育部高等学校博士学科点专项科研基金
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国防重点实验室基金 |
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| 摘 要： | 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.
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| 关 键 词： | 激光-等离子弧复合焊接 对流传热 数值分析 铝合金 |
Numerical simulation on flow and heat transfer in weld pool of laser-plasma hybrid welding |
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| LI Zhining,DU Dong,CHANG Baohua,WANG Li.Numerical simulation on flow and heat transfer in weld pool of laser-plasma hybrid welding[J].Transactions of The China Welding Institution,2007,28(7). |
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| Authors: | LI Zhining DU Dong CHANG Baohua WANG Li |
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| Abstract: | A unified model is establtshed for the liquid zone, mushy zone and solid zone during laser-plasma hybrid welding, which takes into account the surface tension, heat buoyancy and electromagnetic force in the welding pool. The velocity and temperature distributions in weld pool were numerically computed to study the effect of electromagnetic force on the flow and convection heat transfer in weld pool. Results show that the electromagnetic force's effect is negligible and the surface tension is predominant at the initial formation phase of weld pool. With the increasing of the depth of weld pool, the eddy induced by electromagnetic force appears at the bottom of weld pool and results in deeper and wider weld pool. The hybrid welding experiments on 1420 Al-Li alloy show that the computational results agree well with experimental results. |
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| Keywords: | laser-plasma arc hybrid welding convection heat transfer numerical analysis aluminum alloy |
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