摘要
通过VOF模型对熔滴的自由边界进行追踪,并借助二次开发程序UDF(User Defined Function)添加动量方程与能量方程的源项,对低碳钢MIG(Metal Inert Gas Welding)焊接过程的熔滴过渡形态进行了数值模拟。模拟结果显示,当焊接电流为150 A时,熔滴过渡形式为大滴过渡;电流为250A时,为射滴过渡;电流为300 A时,为射流过渡。随着焊接电流的增加,熔滴过渡的频率增加,熔滴过渡的形式逐渐由大滴过渡向射滴过渡再向射流过渡转变。模拟结果与有关文献的试验结果相吻合,从而论证了本文物理模型的准确性。
By tracing the free boundary of droplet with VOF model and adding the source terms of the momentum and energy equations with UDF program, the droplet transfer in MIG welding of low carbon steel was simulated. The simulation results show that when the welding current is 150 A, the droplet transfer mode is globular transfer. When the current is 250 A, the mode is spray transfer.When the current is 300 A, the mode is jet flow transfer. With the increase of welding current, the frequency of droplet transfer increases, and the droplet transfer mode is gradually transformed from globular transfer to spray transfer, and finally to jet flow transfer. The simulation results are in agreement with the experimental results, which proves the accuracy of the physical model in this paper.
出处
《热加工工艺》
CSCD
北大核心
2017年第3期216-219,共4页
Hot Working Technology
