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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。
The VOF model was used to track the free boundary of the droplet. With the help of the UDF (User Defined Function), the source of the momentum equation and the energy equation were added to simulate the droplet of MIG (Metal Inert Gas Welding) The transition morphology was numerically simulated. The simulation results show that when the welding current is 150 A, the droplet transition is in the form of a large droplet transition, the droplet transitions at a current of 250A and the jet transition at a current of 300 A. With the increase of welding current, the frequency of droplet transfer increases. The droplet transfer form gradually changes from large droplet transition to droplet transfer and then to jet transition. The simulation results are consistent with the experimental results of the relevant literature, which proves the accuracy of the physical model.