摘要
【目的】焊接是核废料储罐生产制造过程中必备的一道工序,但该过程中产生的残余应力和变形对储罐本身的强度及安全可靠性影响极大。因此,必须对核废料储罐在等离子弧焊接过程中残余应力和变形的变化规律进行探讨。【方法】采用试验与仿真相结合的方法,讨论了焊接电流对316L核废料储罐筒体等离子弧焊接残余应力和变形的影响。【结果】结果表明,随着焊接电流的增大,焊缝两侧的等效应力分布梯度变小,200~400MPa的应力区面积显著增加;横向残余应力的应力峰值和应力分布随焊接电流的增加而显著增大,而纵向残余应力受焊接电流的影响较小,并且内表面横向、纵向拉伸应力峰值都高于外表面的应力峰值;在不同焊接电流条件下,整体最大变形量和Z方向最大变形量都集中在筒体两侧,纵向变形趋势均呈现朝着筒体中部收缩的规律。【结论】通过将温度历程、残余应力、焊接变形与实测结果进行比较,证明了模拟结果与实测结果吻合良好。
[Objective]Welding is a necessary process in the manufacturing process of nuclear waste storage tanks,but residual stress and deformation generated in the process have a great impact on strength and safety reliability of storage tank itself.Therefore,it is necessary to discuss variation of residual stress and deformation during plasma arc welding of nuclear waste storage tanks.[Methods]Influence of welding current on residual stress and deformation in plasma arc welding of 316L nuclear waste storage tanks is discussed by means of experiment and numerical simulation.[Results]The results show that with the increase of welding current,gradient of equivalent stress distribution on both sides of weld decreases,and stress area of 200~400 MPa increases significantly.The peak stress and stress distribution of transverse residual stress increase significantly with the increase of welding current,while longitudinal residual stress is less affected by welding current,and the peak values of transverse and longitudinal tensile stress on the inner surface are higher than those on the outer surface.Under different welding current conditions,the overall maximum deformation and the maximum deformation in the Z direction are concentrated on both sides of cylinder,and longitudinal deformation trend shows the law of shrinking toward the middle of cylinder.[Conclusion]By comparing temperature history,residual stress and welding deformation with the measured results,it is proved that the simulation results are in good agreement with the measured results.
作者
黄思语
李天宁
洪小龙
黄本生
郑建能
HUANG Siyu;LI Tianning;HONG Xiaolong;HUANG Bensheng;ZHENG Jianneng(Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu 610041,China;School of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,China;Erzhong(Deyang)Heavy Equipment Co.,Ltd.,Deyang 618099,Sichuan,China)
出处
《焊接》
2025年第3期36-44,共9页
Welding & Joining
基金
四川省自然科学基金项目(2023NSFSC0405)
四川省科技计划(2023YFG0378)。
关键词
316L
核废料储罐
数值模拟
焊接电流
残余应力
变形
316L
nuclear waste storage tank
numerical simulation
welding current
residual stress
deformation
作者简介
第一作者:黄思语,硕士,助理工程师,主要从事控制棒驱动机构方面的研究,624617271@qq.com;通信作者:黄本生,博士,教授,博士研究生导师,主要从事焊接数值模拟及智能制造等方面的研究,已发表论文180余篇,hbslxp@163.com。
