Methods of im proving the fatigue life of housing welded joint of middle-sized drive axle

提高中型驱动后桥壳焊接接头疲劳寿命的方法 Methods of im proving the fatigue life of housing welded joint of middle-sized drive axle 胡义华 HU Yihua 1 first-author 柳明 LIU Ming 2 黄志超 HUANG Zhichao 2 卢拱华 LU Gonghua 1 张玉宽 Zhang Yukuan 2 江西江铃底盘股份有限公司 江西江铃底盘股份有限公司 Jiangxi Jiangling Chassis Co.,Ltd. Jiangxi Jiangling Chassis Co.,Ltd. 华东交通大学载运工具与装备教育部重点实验室 华东交通大学载运工具与装备教育部重点实验室 Key Laboratory for Conveyance and Equipment of the Ministry of Education,East China Jiaotong University Key Laboratory for Conveyance and Equipment of the Ministry of Education,East China Jiaotong University 针对某中型驱动后桥壳总成发生垂直弯曲疲劳断裂的问题,分析了该中型驱动后桥壳总成在垂直弯曲交变载荷作用下Y型焊缝疲劳断裂的特征及原因。提出三种提高桥壳焊接疲劳寿命的方法:(1)变更设计方案,将三角板焊缝内移12.5 mm;(2)焊缝接头开坡口;(3)采用大熔深MAG焊恒熔深新工艺焊接Y型焊缝。通过上述方法保证了焊缝熔深以避免后桥壳总成Y型焊缝疲劳裂纹的产生,提高其疲劳寿命。 In order to solve the housing fatigue fracture problem in a middle-sized drive axle under vertical bending loading condition,this paper analyzes the characteristics and causes of the Y-shaped joint fatigue fracture of the housing assembly bearing the vertical bending alternating load. Three methods are proposed to improve the fatigue life of housing welding:（1）change the design scheme,move the triangular plate weld inward by 12.5 mm;（2） groove the weld joint;（3）adopt the new constant penetration MAG welding process to weld the Y-shaped joint. The above three methods ensure the weld penetration to avoid the generation of Y-shaped joint fatigue crack of housing assembly and improve its fatigue life. 驱动后桥壳总成 数值模拟 疲劳寿命 大熔深焊接 drive rear axle housing assembly numerical simulation fatigue life deep penetration welding U463.218.5 2022-03-08 8 50