The major concern in the high tech industries like oil and petroleum industries, automobiles, aeronautical, and nuclear power plants is the control of the defects like distortion in the welded joints and residual stresses occur due to arc welding on the circumferential joints of the thin pipes. Three-dimensional non-linear thermal and thermomechanical numerical simulations are conducted for the tungsten inert gas welding process of SS-304 stainless steel pipes. In this article, numerical analysis of the distribution of the temperature and the welding residual stress fields induced after the welding is done. Study on the effect of the welding heat input by varying the welding parameters (like welding current and welding speed) based on finite element simulations is conduit to examine the results on the residual stresses which is also called as the ‘locked-in’ stresses. The precision of the finite element model is validated for the welding residual stresses. The intention of this study is to provide the information to verify the validity of ongoing process circumferential manufacturing technology for thin-walled pipes, so to avoid the failure of these kinds of structures which are in service because of these intrinsic stresses.

中文翻译：

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不锈钢SS-304薄焊管残余应力数值模拟

石油、石油、汽车、航空、核电站等高新技术产业的主要关注点是对细管周向接头电弧焊引起的焊接接头变形、残余应力等缺陷的控制。 . 对SS-304不锈钢管钨极惰性气体保护焊工艺进行三维非线性热力学和热机械数值模拟。本文对焊接后的温度分布和焊接残余应力场进行了数值分析。基于有限元模拟通过改变焊接参数（如焊接电流和焊接速度）来研究焊接热输入的影响是检查残余应力结果的管道，残余应力也称为“锁定”应力。针对焊接残余应力验证了有限元模型的精度。本研究的目的是提供信息以验证正在进行的薄壁管环向制造技术的有效性，以避免由于这些内在应力而导致这些正在使用的结构失效。