薄壁低碳钢管焊接变形的数值模拟

Numerical modeling of welding distortion in thin-walled mild steel pipe

关键词:  有限元  数值模拟  焊接温度场  焊接变形

Key words:  finite element method  numerical simulation  welding temperature field  welding distortion

摘要:

基于泛用软件ABAQUS,开发了适用于模拟熔化焊产生的温度场、应力场和应变场的热弹塑性非线性有限元计算方法.通过建立三维有限元模型和采用双椭球高斯体积移动热源,对低碳钢薄壁钢管的焊接温度场和焊接变形进行了数值模拟.同时还采用焊接机器人实际进行了低碳钢薄壁钢管的焊接,并实测了钢管的焊接变形.结果表明,数值模拟得到的变形和试验测量值十分吻合,验证了所开发数值计算方法的有效性.

Abstract:

A thermal-mechanical nonlinear finite element method based on ABAQUS was developed to simulate the temperature,residual stress and strain fields in thin-walled structures welded by arc fusion welding processes.The welding temperature field and the welding distortion in a thin-walled mild steel pipe were predicted by using the developed finite element method.Meanwhile,experiments were carried out to measure the actual welding distortion in the thin-walled pipe welded by an arc-welding robot.The coincidence between the simulation and the experimental results confirmed the validity of the numerical simulation method.The numerical simulation method has established a foundation for prediction of welding distortion in thin-walled structure used in practical engineering.