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Numerical Modeling of the Inclusion Behavior during AC Flash Butt Welding
ISIJ International ( IF 1.8 ) Pub Date : 2020-08-26 , DOI: 10.2355/isijinternational.isijint-2020-143
Md Irfanul Haque Siddiqui 1, 2 , Dereje Degefa Geleta 2 , Gyuyeol Bae 3 , Joonho Lee 2
Affiliation  

The entrapment of inclusions in the solidified weld zone is detrimental to its mechanical properties. In an AC flash welding process, the upsetting rate, the initial temperature of the weld pool, and the size of inclusions may affect the final distribution of the inclusions. Additionally, the concentration of sulfur may induce Marangoni convection in the weld pool, which possibly affects the pushing and engulfment of inclusions by the solid at the solid-liquid interface. In the present work, a two-dimensional numerical model based on Computational Fluid Dynamics (CFD) has been developed to investigate the behavior of alumina inclusions during the AC flash welding of a thin SPFH590 steel plate. The Volume of Fluid (VOF) numerical model was coupled with the dynamic mesh model for the motion of plates, discrete phase for inclusion particles and solidification model. The simulation results show that the upsetting parameters significantly affect the overall inclusion motion. A high upsetting rate pushes the inclusions away from the welded joint. The high initial flash temperature does not affect the removal of inclusions from the weld zone. A similar outcome has been noted with respect to the increase in the diameter of the inclusions. Furthermore, the predicted results show that inclusions are prone to engulfment by the solidification front under the influence of higher interfacial tension between the inclusions and melt. Nevertheless, the inclusion displacement under the influence of an interfacial tension gradient is diminutive because of the rapid solidification rate of the weld pool.



中文翻译:

交流闪光对接焊过程中夹杂行为的数值模拟

夹杂物在凝固的焊接区中的夹带不利于其机械性能。在交流闪焊过程中,the粗率,焊池的初始温度和夹杂物的大小可能会影响夹杂物的最终分布。此外,硫的浓度可能会在焊缝中引起Marangoni对流,这可能会影响固-液界面处固体对夹杂物的推动和吞噬。在当前的工作中,基于计算流体动力学(CFD)的二维数值模型已经开发出来,以研究薄SPFH590钢板AC闪焊过程中氧化铝夹杂物的行为。流体体积(VOF)数值模型与用于板运动的动态网格模型耦合,夹杂物颗粒的离散相和凝固模型。仿真结果表明,up粗参数显着影响整体夹杂物运动。高up锻率将夹杂物推离焊接接头。较高的初始闪边温度不会影响从焊接区去除夹杂物。关于夹杂物直径的增加,已经观察到类似的结果。此外,预测结果表明,在夹杂物和熔体之间的界面张力较高的影响下,夹杂物易于被凝固前沿吞噬。然而,由于焊接熔池的快速凝固速率,在界面张力梯度的影响下夹杂物的位移很小。仿真结果表明,the粗参数显着影响整体夹杂物运动。高up锻率将夹杂物推离焊接接头。较高的初始闪边温度不会影响从焊接区去除夹杂物。关于夹杂物直径的增加,已经注意到类似的结果。此外,预测结果表明,在夹杂物和熔体之间的界面张力较高的影响下,夹杂物易于被凝固前沿吞噬。然而,由于焊接熔池的快速凝固速率,在界面张力梯度的影响下夹杂物的位移很小。仿真结果表明,up粗参数显着影响整体夹杂物运动。高up锻率将夹杂物推离焊接接头。较高的初始闪边温度不会影响从焊接区去除夹杂物。关于夹杂物直径的增加,已经观察到类似的结果。此外,预测结果表明,在夹杂物和熔体之间的界面张力较高的影响下,夹杂物易于被凝固前沿吞噬。然而,由于焊接熔池的快速凝固速率,在界面张力梯度的影响下夹杂物的位移很小。高up锻率将夹杂物推离焊接接头。较高的初始闪边温度不会影响从焊接区去除夹杂物。关于夹杂物直径的增加,已经观察到类似的结果。此外,预测结果表明,在夹杂物和熔体之间的界面张力较高的影响下,夹杂物易于被凝固前沿吞噬。然而,由于焊接熔池的快速凝固速率,在界面张力梯度的影响下夹杂物的位移很小。高up锻率将夹杂物推离焊接接头。较高的初始闪边温度不会影响从焊接区去除夹杂物。关于夹杂物直径的增加,已经观察到类似的结果。此外,预测结果表明,在夹杂物和熔体之间的界面张力较高的影响下,夹杂物易于被凝固前沿吞噬。然而,由于焊接熔池的快速凝固速率,在界面张力梯度的影响下夹杂物的位移很小。预测结果表明,在夹杂物与熔体之间的界面张力较高的影响下,夹杂物易于被凝固前沿吞噬。然而,由于焊接熔池的快速凝固速率,在界面张力梯度的影响下夹杂物的位移很小。预测结果表明,在夹杂物与熔体之间的界面张力较高的影响下,夹杂物易于被凝固前沿吞噬。然而,由于焊接熔池的快速凝固速率,在界面张力梯度的影响下夹杂物的位移很小。

更新日期:2020-09-12
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