转向架构架焊接热应力缺陷分析

转向架作为列车走行装置,其性能直接影响着列车运行舒适性以及安全可靠性。构架作为转向架骨架,将转向架各个零部件组成一个整体,并且承受和传递各种力,因此在转向架机构中起着举足轻重的作用。对于现行CRH系列转向架构架而言,均为钢焊接结构,钢焊接结构易出现裂纹、漏焊、焊缝外观不规则等缺陷,因此对焊接构架质量检测尤为重要。本文通过对焊接表面缺陷原因分析,选取了焊接构架裂纹、漏焊、焊缝外观不规则等工件进行了焊接热应力分析验证,并提出了提高焊接构架强度的措施,对生产实际具有一定指导意义。

Defect analysis of welding thermal stress for bogie frame

The bogie was the running device of a high-speed train, its performance was with a great effect on running safety, riding comfort and stability for vehicles. Frame was the skeleton of the bogie, it assembled all parts, was used to support and bear transmission torque and load, thus it played an important role in the bogies. As for CRH1 bogie frames, the frame was with all steel welded structure, and easily producing bead cracks, leakage solder, irregular weld shapes and so on. Thus, the surface quality detection for the weld was necessary. This paper firstly analyzed formation reasons of fault welds, and then, adopted the work piece of class bead cracks, class leakage solder, class irregular weld shapes to test and verify welding thermal stress analysis. Finally, effective measures for frame welding strength were proposed to guide the actual production to some extent.