Numerical simulation and analysis on overlay weld repair of structure of nuclear-grade weldolet weld

XU Shaofeng; BAI Zhonglian; YE Yihai; YANG Biao; XUE Jingkai; LI Shiyi

doi:10.7512/j.issn.1001-2303.2021.05.07

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Numerical simulation and analysis on overlay weld repair of structure of nuclear-grade weldolet weld
Vol. 51, Issue 5, Pages: 34-41(2021)
Published：2021
DOI： 10.7512/j.issn.1001-2303.2021.05.07
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DOI：

XU Shaofeng, BAI Zhonglian, YE Yihai, et al. Numerical simulation and analysis on overlay weld repair of structure of nuclear-grade weldolet weld[J]. Eletric Welding Machine2021, 51(5): 34-41. DOI： 10.7512/j.issn.1001-2303.2021.05.07.

摘要

为优化核级支管座焊缝结构的OVERLAY堆焊修复工艺

基于有限元分析软件Abaqus建立三维有限元模型

结合双椭球热源、生死单元技术

采用热-力顺序耦合计算方式对堆焊修复过程进行数值模拟

研究了结构在堆焊修复过程中温度场、焊接变形及残余应力的分布特性。基于计算结果开展了堆焊影响因素的分析

结果表明在原焊缝结构内侧形成了压应力

从焊缝结构内侧逐渐向外到堆焊层表面

压应力逐渐转变为拉应力

且残余应力随着焊接速度的增大而减小

逆-顺交替的焊接顺序可以有效降低残余应力

为优化堆焊工艺提供了重要的参考。

Abstract

In order to optimize the technology of overlay weld repair of structure of nuclear-grade weldolet weld. Based on the Abaqus software

the 3 D finite element model is established

combined with double ellipsoid source model and birthdeath element

the simulation calculation analysis of the overlay weld repair is carried out

the distribution of temperature field and welding deformation and also residual stress on the process of overlay weld repair is analyzed. Based on the calculation results

the analysis of the influencing factors of surfacing welding is carried out. The results show that compressive stress is formed on the inner side of the original weld structure;from the inner side of the weld structure to the surface of the surfacing layer

the compressive stress gradually transforms into tensile stress;and the residual stress decreases continuously as the increase of the welding speed

also the welding deformation and residual stress can be effectively reduced by using the alternating anticlockwise-clockwise welding sequence. The results of this research can provide reference for the optimization of overlay weld process.