Numerical simulation of metal transfer in pulsed-MIG welding
Numerical simulation of metal transfer in pulsed-MIG welding
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DOI：
10.1007/s40194-017-0492-3
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发表时间：
2017-06
影响因子：
2.1
通讯作者：
Y. Ogino;Y. Hirata;S. Asai
中科院分区：
文献类型：
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作者：
Y. Ogino;Y. Hirata;S. Asai
各种形状的脉冲电流已被用来控制金属转移现象。本文建立了一个包含电弧等离子体和熔滴过渡的仿真模型，并对脉冲电弧焊中电弧等离子体和熔滴过渡的行为进行了数值研究。当峰值电流设置为450 A并且峰值时间设置为1.5 ms时，每个脉冲仅转移单个液滴。该数值模型可以反映金属过渡和电弧等离子体行为取决于脉冲形状。电弧等离子体的温度在峰值时间的早期阶段迅速升高，因此，线电极的温度升高。之后，从焊丝端部产生大量的金属蒸气，电弧温度降低。这些行为是周期性的，可以通过脉冲形状进行控制。此外，适当的脉冲频率取决于线电极的表面张力。这一结果表明，表面张力和电磁力的平衡是重要的，以确定液滴的行为。因此，在控制焊接过程中，重要的是要考虑焊接电源和焊接材料的性能。
Pulsed currents of various shapes have been employed to control the metal transfer phenomena. In the present study, a simulation model including both the arc plasma and the metal transfer is constructed, and their behaviors in pulsed-MIG arc welding are numerically investigated. When the peak current is set to 450 A and the peak time is set to 1.5 ms, only a single droplet is transferred per pulse. The numerical model can indicate the metal transfer and arc plasma behavior depending on the pulse shape. The temperature of the arc plasma increases rapidly at the early phase of the peak time, and consequently, the temperature of the wire electrode increases. After that, a large amount of the metal vapor generates from the wire tip, and the arc temperature decreases. These behaviors are periodic and can be controlled through the pulse shape. In addition, the appropriate pulse frequency depends on the surface tension of the wire electrode. This result shows that balance of the surface tension and the electromagnetic force is important to determine the droplet behavior. Therefore, in controlling the welding process, it is important to consider the properties of both the welding power source and the welding material.