利用改变炸药与取样部位间距离的办法，使初始组织结构和应力状态相同的１６Ｍｎ钢焊缝受到强度不同的冲击波作用．研究了爆炸处理前后冲击波作用弹性区、塑性区、弹─塑性形变交界区１６Ｍｎ钢焊缝的旋转弯曲度劳性能及铁素体内位错结构和形态，提出了爆炸冲击改善焊缝疲劳极限的位错缠结和钉扎理论． By changing the distance between the explosive and the sampling site, the weld of the 16Mn steel with the same initial structure and the same stress state is subjected to the shock waves with different intensities. The rotating bending workability and internal dislocation structure and morphology of 16Mn steel weld in elastic zone, plastic zone, elastic-plastic deformation boundary zone before and after blasting were studied, and the position of explosive impact to improve the fatigue limit of weld Tangled and pinned theory.