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Numerical studies on effect of interpass time on distortion and residual stresses in multipass welding

机译：网球时间对多脂焊机失真和残余应力影响的数值研究

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Weld distortion and residual stresses are two major issues in the fabrication process. Numerical techniques are being tried out to accurately predict the structural integrity of the welding. Interpass time in the multipass welding is an important parameter which influences the weld distortion and residual stresses. In this study two pass tungsten inert gas (TIG) welding of 6 mm mild steel plates has been analyzed using Finite element analysis (FEA) software Sysweld and parametric study is conducted with different interpass time. The temperature distribution, distortion and residual stresses are calculated using three dimensional finite element model (FEM) considering phase transformations in the material. The transient thermo-metallurgical analysis followed by elasto-plastic analysis is carried out using temperature dependent and phase dependent material properties. The material deposition in the multipass welding is numerically simulated using chewing gum method, where dummy phase and dummy material are assigned for the element activation. The phase proportions are calculated by assigning suitable phase kinetics parameter extracted from continuous cooling transformation (CCT) diagram of a given material. Experiments are conducted for validation after given edge preparation and using same material as filler wire. The FEM analysis is carried out for eight cases with different time interval between passes, starting from 30 s to 240 s in the steps of 30 s. FEM results are verified with experimentally measured values. It is found that the time interval between passes has less influence on the residual stresses but significantly affects the distortion and phase proportion due to the first pass preheating effect on second pass and second pass postheating effect on first pass.
机译：焊接变形和残余应力是制造过程中的两个主要问题。正在尝试使用数值技术来准确地预测焊接的结构完整性。多级焊接中的地球时间是影响焊接变形和残余应力的重要参数。在本研究中，使用有限元分析（FEA）软件Sysweld和参数研究，分析了两种Pass钨惰性气体（Tig）焊接6mm温和的钢板的焊接。考虑到材料中的相变的三维有限元模型（FEM）计算温度分布，失真和残余应力。使用温度依赖性和相位依赖性材料性能进行弹性塑料分析的瞬态热冶金分析。使用口香糖法在数值模拟多脂焊接中的材料沉积，其中为元素激活分配伪相和伪材料。通过分配从给定材料的连续冷却变换（CCT）图中提取的合适的相位动力学参数来计算相比例。在给定边缘制备和使用相同的材​​料作为填充丝后进行实验进行实验。通过在30秒的步骤中从30秒开始，从30秒开始，从30秒开始，从30秒开始，从30秒开始进行USP分析。用实验测量值验证有限元素结果。发现通过对残余应力的时间间隔对残留应力的影响较小，而是由于第一通道预热效应和第二次通过第一次通过第二通道效果而显着地影响失真和相位比例。

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