The development of laser beam welding as an advanced, non-contact joining technique in recent years can be attributed primarily to its high feed rates and low thermal distortion in comparison to conventional welding processes. The underlying mechanism of this advantage can be explained by the focused energy input of the laser which enables precise and controlled process execution. Furthermore, the automation potential of laser beam welding has the consequence of broadening its applicability across a wide range of industries. However, despite the many benefits of this process, there are also challenges to be addressed, particularly in relation to the formation of solidification cracks. During the solidification phase, these cracks originate from microcracks within the weld bead and propagate towards the surface as cooling progresses, see [1]. It can be observed that these critical states form in the mushy zone, which is located behind the weld pool and contains the transition between the fully liquid and solid phases. This region exhibits a dendritic microstructure which has been shown to entrap liquid inclusions. The absence of liquid supply during the solidification process can generate critical material states, which can potentially induce stresses that lead to crack formation. This work aims to address this issue from both macroscopic and microscopic perspectives. While a heat source model was implemented on the macroscale in order to precisely simulate the welding process, the resulting dendritic microstructure is analysed on the microscale for critical stress and strain states. The macroscopic model has also already been applied in an HPC environment, see [2]. The dendritic morphology originates from preliminary phase field simulations. Thermal and elastoplastic effects are incorporated to capture the inherent stress and strain states. This combined approach provides valuable insights into the identification of critical failure conditions.