筒体与法兰环焊缝数值模拟

Numerical Simulation of Barrel and Flange Circumferential Weld

运用有限元分析方法,采用双椭球体热源模型,通过制定合理的工艺方案,建立筒体与法兰环焊缝焊接模型,并对焊接应力场进行数值分析。结果表明:依据本文方案施焊,产生的最大残余应力为325.6MPa,小于母材的屈服强度,可以满足使用要求。焊接过程中,应力主要集中在焊缝处及其周围,焊后残余应力集中在焊缝及压板附近,其随着焊接过程中温度的逐渐降低而逐渐产生,是一个过程量而不是瞬时量。

In this paper through the using of finite element method and double-ellipsoidal heat source model,feasible process scheme was made, then we set up the girth weld welding model and did the numerical simulation of welding stress field. The results indicate that according to this scheme welds, the maximum residual stress we got was 325.6MPa, it is less-than the yield strength of parent metal, whith could satisfy the requirements of use; The stress mainly concentrated in and around the commissure,the residual stress in wehled mainly concentrated near the weld and clamp, and the residual stress emerged following the gradually lower of the temperature during the soldering proess, whith proved that the residual stress is quantity of process instead of instantaneous flow.