Thermo-mechanical analysis in SAE-AISI 1524 carbon steel gas tungsten arc welds

E. Bonifaz
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引用次数: 6

Abstract

A thermo-mechanical analysis was conducted in SAE-AISI 1524 carbon steel gas tungsten arc welds. The sequentially coupled thermal-mechanical finite element modelling approach was used to simulate the thermal and stress evolution during the GTAW process. The analysis procedure was divided into two major steps. First, a 3D transient nonlinear heat flow analysis was performed to determine the temperature distribution for the entire welding and cooling cycle of the process. In the second step, the thermal history from the heat flow model was included into the mechanical elasto-plastic calculation of the stress and deformation in the weldment. Temperature-dependent material properties and the effect of forced convection due to the flow of the shielding gas were included in the model. It is encouraging to note that the model is sufficiently accurate to predict the FZ and HAZ weld profiles as evidenced for the good agreement observed between numerical cross-sectional and metallographic temperature profiles. The successful in the results can be attributed greatly to the characteristic heat distribution parameter C selected from the complementary experimental work. For further experimental comparison purposes, numerically predicted residual stresses obtained in three different locations of two different weld situations are presented.
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SAE-AISI 1524碳钢钨气弧焊的热力学分析
对SAE-AISI 1524碳钢钨极气体保护焊进行了热机械分析。采用顺序耦合的热-机械有限元建模方法模拟了GTAW过程中的热演化和应力演化。分析过程分为两个主要步骤。首先,进行了三维瞬态非线性热流分析,以确定整个焊接和冷却过程的温度分布。在第二步中,将热流模型的热历史纳入焊件应力和变形的机械弹塑性计算中。模型中包括了与温度相关的材料特性和由于保护气体流动而产生的强制对流的影响。令人鼓舞的是,该模型足够准确,可以预测FZ和HAZ焊缝轮廓,这证明了在数值横截面和金相温度轮廓之间观察到的良好一致性。结果的成功很大程度上归功于从补充实验工作中选择的特征热分布参数C。为了进一步的实验比较,给出了在两种不同焊接情况下的三个不同位置获得的数值预测残余应力。
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来源期刊
CiteScore
1.20
自引率
0.00%
发文量
3
期刊介绍: IJCMSSE is a refereed international journal that aims to provide a blend of theoretical and applied study of computational materials science and surface engineering. The scope of IJCMSSE original scientific papers that describe computer methods of modelling, simulation, and prediction for designing materials and structures at all length scales. The Editors-in-Chief of IJCMSSE encourage the submission of fundamental and interdisciplinary contributions on materials science and engineering, surface engineering and computational methods of modelling, simulation, and prediction. Papers published in IJCMSSE involve the solution of current problems, in which it is necessary to apply computational materials science and surface engineering methods for solving relevant engineering problems.
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