摘要
运用有限元法对不同壁厚的管道进行在线焊接时的温度场进行了数值模拟,内部介质流动对焊接温度场的影响通过确定介质与管壁的换热系数来考虑,并根据温度计算结果,获得管道的剩余强度因子,进而获得管道的极限压力。研究表明,焊缝上点的峰值温度随着壁厚的增大而略有升高,而主管内壁的峰值温度随着壁厚的增大而下降。当壁厚增大到一定程度时,在线焊接管道的剩余强度因子增大速度减缓。
Temperature distribution of in - service welding onto pipes of different thickness was simulated by FEM. The effect of flowing of internal media was regarded as forced convection. Based on the numerical results, the remaining strength factor of the pipe can be obtained and limit pressure can be predicted. It can be concluded that with the increasing of pipe - wall thickness, temperature of the points in inner surface of the main pipe show monotone decreasing. However, there is a little increase of the weld pool temperature. While the thickness increases to an extent, the RSF show little increase.
出处
《压力容器》
北大核心
2006年第3期15-18,43,共5页
Pressure Vessel Technology
基金
中石化集团公司基金资助项目(304001)
南京工业大学博士学位论文创新基金资助项目(BSCX200511)
关键词
在线焊接
管壁厚度
温度场
极限压力
in-service welding
pipe-wall thickness
temperature fields
limit pressure
