Because of its local nature, the influence of residual stresses on fatigue life of welded joints in the high cycle regime can be quantified by the residual notch stress intensity factor (R-NSIF). The standard methodology used for its assessment requires a very fine mesh and this is the reason why 2D numerical models were used first in literature. The calculation of R-NSIF values via 3D models is very recent. It was found possible thanks to rapid numerical techiques such as the peak stress method. This approach was proven to work well but R-NSIF values coming from 3D models were not consistent with those obtained through 2D models. This work is aimed at solving that apparent discrepancy. 2D and 3D welding process numerical simulations applied to a carbon steel were carried out taking into account effects of metallurgical transformations and by varying the main geometrical parameters of the plates. It was found that 2D models are able to capture the R-NSIF value that is observed in the stationary residual stress distribution of the corresponding 3D models.

由于其局部性，残余应力对焊接接头在高循环状态下的疲劳寿命的影响可以通过残余缺口应力强度因子（R-NSIF）来量化。用于评估的标准方法需要非常精细的网格，这就是为什么在文献中首先使用 2D 数值模型的原因。通过 3D 模型计算 R-NSIF 值是最近的事情。由于峰值应力法等快速数值技术，人们发现这是可能的。这种方法被证明是有效的，但来自 3D 模型的 R-NSIF 值与通过 2D 模型获得的值不一致。这项工作旨在解决这种明显的差异。考虑到冶金转变的影响并通过改变板的主要几何参数，进行了应用于碳钢的 2D 和 3D 焊接工艺数值模拟。发现 2D 模型能够捕获在相应 3D 模型的静止残余应力分布中观察到的 R-NSIF 值。