Based on welded joints S-N curves provided by IIW standard and dynamic stress spectrum tested on line, fatigue life prediction for welded frame of speed-up bogie is given.

• 通过与IIW标准中提供的焊接接头结构的对比分析，提出对某提速客车转向架焊接构架的定位座根部焊接结构进行打磨的改进方案。