Numerical modelling of welded T-joint configurations using SYSWELD

H.M.E. Ramos, S.M.O. Tavares, P.M.S.T. de Castro
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引用次数: 14

Abstract

Advances in computational tools for welding process simulation have been noteworthy, allowing to assess complex phenomena, as is the case of welding distortion and residual stress. The most advanced tools take into account the thermo-metallurgical and thermo-mechanical changes that take place during the welding processes. Considering these changes and the materials properties at the different temperature values, it is possible to obtain reliable models of the welding processes. In this communication, T-joint welded configurations are investigated, considering arc welding and laser beam welding processes. For this purpose, the commercial software ESI SYSWELD was adopted, since it is one of the most advanced tools for this purpose. These models are based on finite elements; therefore, a mesh sensitivity analysis was performed in order to evaluate the minimum element size required for accurate results. In arc welded double side T-joint, different procedures were explored in order to understand the influence in the residual stress; the second pass does not increase the maximum residual stress, however it increases the area with tensile residual stress. Results for a T-joint between a steel tube and a steel plate using laser beam welding (LBW) and arc welding were obtained. The laser beam welds presented a significant reduction of the heated affected zone and, consequently, the tensile residual stresses are confined to a smaller area.

基于SYSWELD的焊接t型接头结构数值模拟
焊接过程模拟计算工具的进步值得注意,允许评估复杂的现象,如焊接变形和残余应力的情况。最先进的工具考虑到焊接过程中发生的热冶金和热机械变化。考虑到这些变化和材料在不同温量值下的性能,可以获得可靠的焊接过程模型。在本文中,研究了t型接头的焊接结构,考虑了弧焊和激光束焊接工艺。为此,采用了商业软件ESI SYSWELD,因为它是用于此目的的最先进的工具之一。这些模型是基于有限元素的;因此,进行了网格敏感性分析,以评估准确结果所需的最小单元尺寸。在双侧t形接头弧焊中,探讨了不同工艺对残余应力的影响;第二道次不增加最大残余应力,但它增加了拉伸残余应力的面积。对钢管与钢板之间的t形接头进行了激光焊接和电弧焊。激光束焊缝的热影响区显著减小,因此,拉伸残余应力被限制在较小的区域内。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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