摘要
以M310核电机组CRDM上部Ω密封结构为研究对象,开展了凸面异形结构ERNiCrFe-7A堆焊层裂纹控制的研究,研究了收弧电压、收弧衰减时间对弧坑裂纹的影响,研究了焊接电流、电弧电压、焊接速度等焊接工艺参数对高温失塑裂纹(DDC)的影响。结果表明,弧坑裂纹和DDC是主要的裂纹形式;增强焊接保护效果、控制衰减时间及采取合理焊接顺序可以防止弧坑裂纹;采用合适焊接热输入,可以避免ERNiCrFe-7A在凸面异形结构堆焊过程中产生DDC。
Taking the upperΩsealing structure of CRDM in M310 nuclear power unit as the research object,the crack control of ERNiCrFe-7A surfacing layer on convex and special-shaped structure was studied.The influence of arc extinction voltage and decay time on crater crack was studied.The influence of welding current,arc voltage,welding speed and other welding parameters on ductility dip cracking(DDC)was studied.The results showed that crater crack and ductility dip cracking were the main crack forms.Crater crack could be prevented by strengthening welding protection effect,controlling decay time and adopting reasonable welding sequence.DDC generated by ERNiCrFe-7A during surfacing of convex and special-shaped structure could be avoided by appropriate welding heat input.
作者
林方强
芦丽莉
李诗易
薛谦
柏忠炼
徐少峰
Lin Fangqiang;Lu Lili;Li Shiyi;Xue Qian;Bai Zhonglian;Xu Shaofeng(Nuclear Power Institute of China,Chengdu 610213,China)
出处
《焊接》
北大核心
2023年第7期54-58,64,共6页
Welding & Joining
