Abstract The present work aims to evaluate distortion and residual stresses in thick plate weld joints of austenitic stainless steel. Quantification of residual stresses in thick austenitic stainless steel weld joint is important because it is not desirable to carry out stress relieving after welding owing to the susceptibility to sensitization in the heat-affected zone. Therefore, systematic studies were carried out to predict and measure distortion and residual stresses in the austenitic stainless steel plate weld joint. Variables influencing the generation of residual stresses such as heat input, welding speed, constraints during welding were considered. 20 mm thick plate weld joint of austenitic stainless steel material was prepared using gas tungsten arc welding (GTAW) in unclamped condition and distortions were measured during welding after each pass. Sub-surface and through-thickness residual stresses were measured using blind hole drilling (BHD) and deep hole drilling (DHD) techniques respectively. Thereafter, the weld joint was modeled using the finite element method and analyzed for residual stresses and distortions. Thermal analysis was carried out using actual welding parameters and temperature-dependent material properties to generate temperature profile and compare it with the measured values. The temperature profile along with necessary boundary conditions was used for structural analysis to obtain distortion and residual stresses. Experimental and finite element analysis results for distortion and residual stresses compare well. Details of the experimental and numerical analysis results of distortion and residual stresses for thick section plate weld joints have been discussed in this paper. Also, the effects of differences in yield strengths of weld and base metals on distortion and residual stress results have been brought out.

中文翻译：

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奥氏体不锈钢厚板焊缝变形与残余应力的试验与分析

摘要 目前的工作旨在评估奥氏体不锈钢厚板焊接接头的变形和残余应力。对厚奥氏体不锈钢焊接接头中残余应力的量化很重要，因为由于热影响区对敏化的敏感性，在焊接后进行应力消除是不可取的。因此，进行了系统研究以预测和测量奥氏体不锈钢板焊接接头的变形和残余应力。考虑了影响残余应力产生的变量，如热输入、焊接速度、焊接过程中的约束。使用钨极气体保护焊 (GTAW) 在未夹紧状态下制备 20 毫米厚的奥氏体不锈钢板焊接接头，并在每次焊道后测量焊接过程中的变形。分别使用盲孔钻削 (BHD) 和深孔钻削 (DHD) 技术测量次表面和全厚度残余应力。此后，使用有限元方法对焊接接头进行建模，并分析残余应力和变形。使用实际焊接参数和与温度相关的材料特性进行热分析，以生成温度曲线并将其与测量值进行比较。温度分布和必要的边界条件被用于结构分析以获得变形和残余应力。变形和残余应力的实验和有限元分析结果比较好。本文详细讨论了厚截面板焊接接头变形和残余应力的实验和数值分析结果。此外，还提出了焊缝和母材屈服强度差异对变形和残余应力结果的影响。