摘要
针对目前国内外双金属复合管焊缝失效较多的情况,通过有限元分析软件ANSYS,运用其热源加载、移动及生死单元技术实现了焊接过程的模拟,从而探索焊接残余应力对焊缝失效的影响。运用间接法,先模拟出焊接时焊缝的温度场,再将温度场加载至单元计算应力场,得出焊缝的应力分布曲线。分析发现,焊缝区最大应力为拉应力,最大应力值虽未超过材料的屈服极限,不是焊缝失效的直接原因,但对焊缝腐蚀有诱导作用。通过有限元技术对复合管对接焊时的应力分布进行了数值仿真分析。其结果对对接焊接的工艺设计有一定的理论指导作用。
To deal with the problems of the welding failure of bimetal composite pipes, the welding process is simulated with application of finite element analysis software ANSYS by using its heat source loading, moving and life ＆ death unit technology so as to study the impact of welding residual stress on the weld failure. The indirect method is applied to simulate the welding temperature field in welding, which is loaded into the unit to calculate the stress field and to get the stress distribution curve. The analysis has found that the maximum stress of the weld area is tensile stress which has not exceeded the yield limit of the material. Although it is not the direct cause of the welding failure, it is an inducing factor. The results of the numerical simulation of composite pipe welding stress distribution have provided a theoretical guidance for the process design of composite pipet welding.
出处
《石油化工腐蚀与防护》
CAS
2015年第2期42-45,64,共5页
Corrosion & Protection In Petrochemical Industry
关键词
双金属复合管
焊接模拟
温度场
应力场
mechanical, bimetal composite pipe, welding simulation, temperature field, stress field
