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首页> 外文会议>International Symposium on Computer-Aided Welding Engineering(CAWE 2006) vol.1; 20061019-22; Jinan(CN) >Numerical Analysis for Variable Polarity Plasma Arc Welding Process
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Numerical Analysis for Variable Polarity Plasma Arc Welding Process

机译：变极性等离子弧焊接工艺的数值分析

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摘要

Three-dimensional time-dependent governing equations in nonorthogonal body-fitted curvilinear coordinate system for analysis of variable polarity plasma arc welding (VPPAW) process were established. Numerical analysis of VPPAW process for aluminum alloy LF6 was conducted via the developed models, which laid a foundation to guide procedure optimization for VPPAW process. Functions between temperature and thermophysical properties for aluminum alloy LF6 were established. Fluid flow field, thermophysical properties, temperature field and free surface deformation of the keyhole weld pool were coupled into computation. Effect of wire filling on the geometry of the molten pool and double-sided weld reinforcements was considered in the simulation. Moreover, effects of welding current, travel speed also heat input on geometry and dimensions of the keyhole weld pool as well as fluid flow field in the molten pool for the main welding stage were numerically analyzed and compared. In addition, reliability of the established models was verified experimentally through weld cross-section profiles.
机译：建立了非正交拟合曲线坐标系中的三维时变控制方程，用于分析可变极性等离子弧焊（VPPAW）过程。通过建立的模型对铝合金LF6的VPPAW工艺进行了数值分析，为指导VPPAW工艺的工艺优化奠定了基础。建立了铝合金LF6在温度和热物理性能之间的函数。将锁孔焊池的流体流场，热物理性质，温度场和自由表面变形耦合到计算中。模拟中考虑了焊丝填充对熔池和双面焊缝的几何形状的影响。此外，数值分析并比较了焊接电流，行进速度以及热量输入对锁孔焊池的几何形状和尺寸以及主焊接阶段熔池中流体流场的影响。此外，已建立的模型的可靠性通过焊缝截面轮廓进行了实验验证。

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