F draftsill is an integrated casting component with thin wall and inner empty box, and irregular deformations like torsion and bending occur easily.
牵引梁为薄壁、内空箱体整体铸造构件，铸件容易出现搓扭和弯曲无规律性变形。
2
The result shows some cracks appearing on vertical weld connecting web plate of body bolster and draftsill as well as the part between web plate of body bolster and top cover plate.