以青海省云谷川倒虹吸为工程背景,采用有限元分析软件ANSYS,建立考虑热-固耦合效应的压力钢管全熔透坡口焊三维焊接有限元模型,选用单向顺序耦合法,对输水压力钢管进行数值模拟分析,提出合理的焊接工艺,计算不同焊接工艺的压力钢管焊接残余应力和残余变形分布。焊接热源采用内生热率热源模型,多道施焊过程采用热源生死单元法模拟焊接全过程,从压力钢管施焊后内部残余应力与残余变形的大小及分布等方面进行对比分析,提出压力钢管制作的焊接工艺建议,为实际工程压力钢管制作提供技术依据,为类似工程提供技术参考。

The engineering background of this research is the project of the YunGuChuan inverted siphon in Qinghai Province. In this paper, using one-way sequential coupling method, the finite element analysis software ANSYS is used to simulate the residual stress and deformation distribution of welded steel pipes with different welding process, establishing the three-dimensional welding finite element model of fully-welded grooved welded pipe considering thermosetting coupling effect. Welding heat source uses endogenous heat rate source model and multi-channel welding process uses heat source unit life and death simulation. Through the comparison and analysis of the level and distribution of internal residual stress and residual deformation after welding, the proposals for the welding technology of the pressure steel pipe are put forward, which provide the technical basis for the production of actual engineering pressure steel pipes. It is also a technical reference for similar projects.