船用薄板焊接接头残余变形有限元模拟

运用热弹塑性有限元法,对不同焊接工艺条件下板厚6 mm的AH36钢薄板焊接接头残余变形进行了有限元模拟研究.结果表明,使用不同的焊接方法,纵向挠曲变形和角变形量发生显著变化,采用单一CO2气体保护焊,焊接残余变形量较小;采用CO2气体保护焊+埋弧焊的混合焊方法,焊接残余变形量有所增大;在焊缝背面施加雾化水冷,可以有效控制焊接残余变形,尤其对于控制采用单一CO2气体保护焊的角变形成效显著.为了验证有限元模拟结果的准确性,采用与有限元模拟完全相同的工艺条件对AH36钢薄板进行了焊接残余变形试验,试验结果与数值模拟结论存在一定误差,但基本变化趋势一致,表明采用有限元模拟技术可以预测AH36钢薄板焊接残余变形.

Numerical simuation of welding residual deformation in welded joints of marine steel plate by FEM

Using the three-dimensional finite element method,the residual deformation of joints obtained with the AH36 steel plate with thickness of 6 mm under different welding conditions was studied in this paper.The numerical simulation results showed that the longitudinal distortion and the angular distortion changed dramatically.As to different welding methods,the deformation was small when the unique CO2 gas arc welding was used,while large deformation was found when the CO2 arc and SAW were combined together.The residual deformation was controlled effectively by water cooling,especially for angular deformation with the unique CO2 gas arc welding.To verify the finite element simulation results,an experiment using the same parameters was done.With some error,the experimental results were consistent with the numerical results,indicating that the welding deformation in different welding conditions can be simulated with the three-dimensional finite element method.