摘要
采用焊接专用有限元分析软件对Q345D低合金高强钢工字梁焊接结构手工MAG焊接过程进行数值仿真,分析最优热输入条件下的温度场分布、熔池形态及熔池邻近区域金属升降温速率。此外,结合Q345D钢连续冷却组织转变图(CCT曲线),预测了焊缝及热影响区的微观组织组成。研究结果可为下一步预测该焊接变形和残余应力的分布提供热学方面的理论借鉴。
The welding process of Q345D low alloy high strength steel beam structure manual MAG welded was numerically simulated by special welding finite element analysis software. The temperature distribution, the morphology of molten pool and cooling rate of metal in adjacent the pool areas under the optimal thermal input condition were analyzed. Furthermore, based on the CCT curve of Q345D low alloy high strength steel, the microstructure of the welded joints at weld beam heat affected zone was predicted. The research results can provide thermal theory for the further prediction of welding deformation and residual stress distribution.
出处
《热加工工艺》
CSCD
北大核心
2013年第7期183-185,188,共4页
Hot Working Technology
基金
江苏省无线传感系统应用工程技术开发中心校企合作项目(2011-12)
关键词
Q345D钢
焊接温度场
热循环曲线
有限元分析
Q345D steel
welding temperature field
thermal cycle curve
finite element analysis
