结构件的焊缝采取何种坡口型式直接决定着焊后残余应力的大小和分布,甚至影响着结构件承载时的安全性。本文采用有限元数值模拟软件,利用高斯热源和“生死”单元技术,讨论了I型和V型坡口型式对1000MW级压水堆核电站反应堆压力容器接管处马鞍型焊缝残余应力场及残余变形大小和分布的影响。结果表明:焊缝坡口型式对残余应力及变形的大小和分布影响较大。 Structure of the weld which bevel type directly determines the size and distribution of post-weld residual stress, and even affect the safety of the bearing structure. In this paper, the finite element numerical simulation software, the use of Gaussian heat source and “life and death ” unit technology, discusses the type I and V groove type of 1000MW PWR nuclear reactor pressure vessel takeover at the saddle-type weld residual stress field and Residual deformation size and distribution of the impact. The results show that the weld groove type has great influence on the size and distribution of residual stress and deformation.