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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers. Part L, Journal of Materials: Design and Application >Numerical simulation of the metal inert gas welding process that considers grain heterogeneity
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Numerical simulation of the metal inert gas welding process that considers grain heterogeneity

机译：金属惰性气体焊接过程的数值模拟，其考虑晶粒异质性

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摘要

It is of great significance to reveal the microevolution mechanism of welded structures during thermo-mechanical coupling to improve the welding quality. In this paper, a random microcrystalline structure model for welds is established by the Voronoi tessellation method. According to the nanoindentation results, heterogeneous grains are produced. A welding workpiece model with statistical significance is established. On this basis, the Python script and the birth and death element method are used to realize the transient growth of a weld, and a thermo-mechanical coupling model for the SUS301L-HT stainless steel metal inert gas welding process is established. The temperature field and thermal stress field are calculated. The calculation shows that the thermal stresses along the growth direction of the weld area are in the form of a “trapezoid,” and the stresses at both ends are small. The stress in the vertical direction of the weld has a single peak, and the peak appears in the center of the weld. The stress distribution of the model that considers heterogeneous grains is obviously inhomogeneous compared with that of the traditional model. The thermal stress distribution in the weldment is obviously inhomogeneous due to the heterogeneous grains, the stresses at the boundaries of the adjacent grains in the weldment change abruptly. It is found that the greater the difference in the mechanical properties between grains is, the more obvious the change.
机译：在热机械耦合期间揭示焊接结构的微型方差机制是具有重要意义，以提高焊接质量。本文采用了Voronoi Tessellation方法建立了焊缝随机微晶结构模型。根据纳米狭窄的结果，产生异质晶粒。建立了统计显着性的焊接工件模型。在此基础上，使用Python脚本和出生和死亡元素方法来实现焊缝的瞬态生长，并且建立了SUS301L-HT不锈钢金属惰性气体焊接过程的热机械耦合模型。计算温度场和热应力场。该计算表明，沿焊接区域的生长方向的热应力呈“梯形”的形式，并且两端的应力小。焊缝的垂直方向上的应力具有单峰，峰值出现在焊缝的中心。与传统模型相比，考虑异质晶粒的模型的应力分布显然是不均匀的。由于异质晶粒，焊接中的热应力分布显然是不均匀的，焊接中相邻颗粒的边界处的应力突然变化。结果发现，谷物之间的机械性能差异越大，变化越明显。

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