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首页> 外文会议>ASME international mechanical engineering congress and exposition;IMECE2011 >NUMERICAL INVESTIGATION OF TRANSIENT MARANGONI EFFECTS ON WELD POOL DYNAMICS IN GAS TUNGSTEN ARC WELDING OF STAINLESS STEEL
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NUMERICAL INVESTIGATION OF TRANSIENT MARANGONI EFFECTS ON WELD POOL DYNAMICS IN GAS TUNGSTEN ARC WELDING OF STAINLESS STEEL

机译：瞬态马兰戈尼效应对不锈钢钨极氩弧焊熔池动力学的数值研究

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摘要

In this study, the fluid flow, heat transfer, and phase change occurring during the Gas Tungsten Arc (GTA) welding of stainless steel are numerically analyzed. Of all the driving forces involved during GTA welding, the Marangoni convection due to surface tension gradient is the most dominant. The amount of surfactant present in the metal strongly influences the strength, location, and direction of the Marangoni convection. Limited work has been done in the study of transient Marangoni convection behavior in the regime where a significant amount of surfactant is present, and depending on the thermal distribution in the molten metal pool, the surface tension gradient undergoes inflection, resulting in a flow reversal. The present investigation aims to address the complex relationship among the flow reversal, surfactant activity, and thermal pattern in the weld pool.
机译：在这项研究中，数值分析了在不锈钢的钨极氩弧焊（GTA）焊接过程中发生的流体流动，传热和相变。在GTA焊接过程中涉及的所有驱动力中，由表面张力梯度引起的Marangoni对流是最主要的。金属中存在的表面活性剂的量会强烈影响Marangoni对流的强度，位置和方向。在存在大量表面活性剂的状态下，对瞬态Marangoni对流行为的研究已经做了有限的工作，并且根据熔融金属池中的热分布，表面张力梯度会发生变化，从而导致流动逆转。本研究旨在解决焊缝池中逆向流动，表面活性剂活性和热模式之间的复杂关系。

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