Keyhole and weld shapes for plasma arc welding under normal and zero gravity
Keyhole and weld shapes for plasma arc welding under normal and zero gravity
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发表时间：
1990
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通讯作者：
R. Keanini;B. Rubinsky
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文献类型：
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作者：
R. Keanini;B. Rubinsky
本文对穿透氩等离子弧射流与静止液态金属熔池之间的界面（小孔）形状进行了一阶研究。该接口是使用杨拉普拉斯方程通过假设等离子体射流的行为作为一个一维的理想气体流，并通过忽略焊接熔池内的流动。小孔形状的解决方案允许基于液体熔体是停滞的热边界层的假设的液-固金属相边界位置的近似确定。参数研究考察了等离子体质量流量、初始等离子体焓、液态金属表面张力和射流剪切力对正常重力和零重力下焊件形状的影响。这项研究的更重要的发现之一是，小孔和焊缝几何形状受重力的影响最小，这表明在重力下收集的数据可用于规划空间焊接。
A first order study of the interfacial (keyhole) shape between a penetrating argon plasma arc jet and a stationary liquid metal weld pool is presented. The interface is determined using the Young-Laplace equation by assuming that the plasma jet behaves as a one-dimensional ideal gas flow and by neglecting flow within the weld pool. The solution for the keyhole shape allows an approximate determination of the liquid-solid metal phase boundary location based on the assumption that the liquid melt is a stagnant thermal boundary layer. Parametric studies examine the effect of plasma mass flow rate, initial plasma enthalpy, liquid metal surface tension, and jet shear on weldment shape under both normal and zero gravity. Among the more important findings of this study is that keyhole and weld geometries are minimally affected by gravity, suggesting that data gathered under gravity can be used in planning in-space welding.