提出BO?BO轴式机车转向架焊接构架轻型化评定准则,根据构架整体结构有限元法分析结果,用边界元法分析了构架侧梁下盖板横向对接焊缝的应力分布,讨论对接焊缝因其根部未焊透引起的应力集中和降低承受拉应力的对接焊缝应力状态的可行性方案,比较理论分析与疲劳强度试验结果,边界元法能较为准确地评述焊缝区域的应力分布状态.“,”The rule for assessing the lightening of welded frame of Bo Bo locomotive bogie is proposed. Based on the analysis result of the frame?s whole structure with finite element method, the stress distribution in the lateral butt weld on the bottom cover plate of the side beam of the frame is analyzed with boundary element method. The stress concentration due to the incomplete penetration root of the weld is discussed, and a feasible scheme to reduce the stress in the tensile butt weld is presented. A compari...