一、概述轮辋是机动车上受力最大的零件之一。通常由低碳钢板经辊轴圆——接头压平对焊——滚压扩径等工序加工成形。由于其外形复杂多变,边沿弯曲变形大(见图1),无论是深式或平式轮辋,在焊缝处都受到拉应力、压应力、剪切应力和扭曲应力等多种综合应力的作用。在机动车运行过程中轮辋始终处于疲劳冲击的状态,接缝处的微小缺陷都可能导致大的事 First, an overview The rim is one of the most force-loaded parts on a motor vehicle. Usually by the low-carbon steel roller shaft - joint pressure flat welding - rolling diameter expansion process such as forming. Because of its complex and changeable shape, the edge of the large bending deformation (see Figure 1), whether deep or flat rims, at the weld by tensile stress, compressive stress, shear stress and torsional stress and other comprehensive stress effect. The rim is always in a state of fatigue and fatigue during the running of the motor vehicle. The tiny defects in the seams can cause great things