北京型3000马力内燃机车车架边梁是箱形结构,由压型槽钢、中间隔板和下盖板组成(图1)。材料为A3。边梁全长11000毫米。边梁焊后的允许上挠度为20～22毫米,旁弯不大于5毫米。采用原生产工艺焊接边梁的两条纵缝后,通常产生f=46～50毫米的上挠变形(图2), Beijing 3000 horsepower diesel locomotive frame side beam is box-shaped structure, by the pressure channel, the middle partition and the lower cover (Figure 1). Material is A3. Beam length of 11000 mm. Allowance on the beam after welding on the deflection of 20 to 22 mm, not more than 5 mm side-bend. After the two longitudinal slits of the welding side beam are welded by the original production process, the upper flexural deformation of f = 46-50 mm usually occurs (FIG. 2)