根据构架牵引梁材料的焊接性特点，选择了合理的焊接方法及焊接材料。
According to welding characteristics of the frame traction beam material, we choose proper welding methods and welding materials.
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。
F draft sill is an integrated casting component with thin wall and inner empty box, and irregular deformations like torsion and bending occur easily.
试验结果表明，无中梁罐车存在枕梁腹板与牵引梁立焊缝裂纹及枕梁腹板与枕梁上盖板之间的裂纹。
The result shows some cracks appearing on vertical weld connecting web plate of body bolster and draft sill as well as the part between web plate of body bolster and top cover plate.
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