摘要
为了改进超大型桩腿的焊接工艺,采用ANSYS的生死单元与移动高斯热源对超大型圆柱形桩腿的打底焊接过程进行模拟,得到圆柱形桩腿打底焊接的残余应力分布与焊接变形。研究发现:在桩腿焊接预热及保温温度为150℃的条件下,焊接残余应力最大值为692 MPa,第2道焊缝的残余应力小于第1道焊缝;圆柱形桩腿主要变形为角变形,最大变形量为0.544mm。将桩腿焊接的预热及保温温度分别为100℃和200℃的结果与150℃的模拟结果进行对比,发现选取150℃作为焊接预热及保温温度时,焊接残余应力及焊接径向变形均最小。
In order to improve the welding technology of super large pile legs,numerical simulation of the root welding process for the cylindrical pile legs based on birth-death element and moving Gauss heat model in ANSYS is carried out.Both distribution of residual stresses and welding deformation during the root welding process are simulated.When preheating and insulating at 150℃,the maximum welding residual stress is 692 MPa,and the residual stress of the second welding seam is less than that of the first one.The maximum total deformation of the cylindrical pile legs is 0.544 mm,with angle deformation being its main deformation form.Preheating and insulating of pile legs is also carried out at 100℃ and 200℃ respectively.Results show that preheating and insulating at 150℃ is better both for the welding residual stress and the radial deformation.
出处
《中国海洋平台》
2017年第5期89-93,100,共6页
China offshore Platform
基金
江苏省产学研项目(No.BY2015070-05)
江苏省工业支撑计划(No.BE2013119)
关键词
风电安装船
桩腿
数值模拟
焊接变形
残余应力
wind turbine installation vessel
pile leg
numerical simulation
welding deformation
residual stress
