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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Predictions of weld pool profiles using plasma physics
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Predictions of weld pool profiles using plasma physics

机译：使用等离子物理预测焊池轮廓

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This paper gives a review of recent papers which have led to the capability of the prediction of weld depths for gas tungsten arc welding, for any given arc current, electrode shape or separation and welding gas. The methodology is given for deriving plasma composition as a function of temperature and pressure from basic atomic and molecular properties. Transport coefficients of density, specific heat, enthalpy, electrical conductivity, thermal conductivity, viscosity and radiation emission coefficients can then be derived as a function of temperature. The conservation equations of fluid dynamics are then used to derive weld profiles for stainless steel for welding gases such as argon, helium, carbon dioxide and a 10% mixture of hydrogen in argon. The markedly different weld depths which are obtained are related to basic material functions such as specific heat, electrical and thermal conductivity. The temperature dependence of the surface tension coefficient has a marked effect on weld depth and profiles because it can influence the direction of circulatory flow in the weld pool. Electric arcs in helium and carbon dioxide are more constricted than arcs in argon and as a consequence the magnetic pinch pressure of the arc, transmitted to the weld pool, can force strong downward flows in the weld pool and thus lead to a deep weld. It is found that because of the interactions of the arc and the weld pool through effects such as viscous drag forces of the plasma on the weld pool, it is necessary to treat the arc, the electrode and the weld pool in a unified system.
机译：本文对最近的论文进行了综述，这些论文使得能够针对任何给定的电弧电流，电极形状或分离以及焊接气体来预测气体钨极电弧焊的焊接深度。给出了从基本原子和分子特性得出作为温度和压力函数的血浆成分的方法。然后可以得出密度，比热，焓，电导率，热导率，粘度和辐射发射系数的传输系数，它们是温度的函数。然后使用流体动力学的守恒方程式推导用于焊接气体（例如氩气，氦气，二氧化碳和氩气中10％的氢气）的不锈钢的焊接曲线。获得的明显不同的焊接深度与基本材料功能（例如比热，电导率和导热率）有关。表面张力系数的温度依赖性对焊缝深度和轮廓有显着影响，因为它会影响焊缝池中循环流的方向。氦气和二氧化碳中的电弧比氩气中的电弧更狭窄，因此，电弧的磁夹压传递到焊池，会迫使焊池中强烈向下流动，从而导致焊缝深。已经发现，由于电弧和焊池通过诸如等离子在焊池上的粘性拖曳力的作用而相互作用，因此有必要在统一的系统中处理电弧，焊条和焊池。

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