Casting stress is due to different parts of 3D flexible welding table withstand a different force in casting solidification process, uneven force will cause deformation, which is inevitable.
As for the size of deformation, it depends on flexible welding table casting structure and strength, If the stress is large enough, and the mold or part itself impedes the realization of this deformation, the casting will crack. Casting in the early solidification, known as hot cracking, late cracks, said cold cracking.