API X65管道深水铺设GMAW横向焊接温度场

Study on temperature field of GMAW horizontal welding for deep water laying of API X65 pipe

为了应对管道深水铺设GMAW横向焊接熔池下坠、窄坡口、无衬垫等挑战,建立了管道三维模型并进行了网格划分,利用材料软件生成了API X65温度场材料数据库,通过模拟温度场云图与实际焊缝截面的匹配校核了Goldak双椭球热源模型,管道焊接温度场分布SYSWELD软件模拟结果与实际焊接过程相符合.建立了焊接温度场测试系统,通过背孔法埋设的热电偶测量了API X65管线钢平板焊接的热循环曲线.测试曲线与SYSWELD仿真曲线具有相同的温度升降趋势,上板节点温度也均明显低于下板节点温度.采用焊缝截面平均热循环曲线作为热源进行了多道焊模拟,并进行了试验.结果表明,多道焊焊接变形是由焊接工艺参数与残余应力释放共同确定的.

To meet challenges of GMAW horizontal welding in deep water pipeline laying,such as molten pool falling,narrow gap groove and without backing support,a 3D model of pipe is established and meshed,temperature field material database of API X65 is generated by material software,the Goldak double ellipsoid heat source model is checked by matching the simulated temperature field cloud chart with the actual weld cross section,and temperature field distributions in pipe welding simulated by SYSWELD software are consistent with the actual welding process.The welding temperature field test system is established,and the thermal cycle curve of API X65 pipeline steel plate welding is measured by the thermocouple embedded in the back hole method.Tested curve has the same temperature rise and fall trend as the SYSWELD simulated curve,and temperature of upper plate node is significantly lower than that of lower plate node.The average thermal cycle curve of weld cross section is used as the heat source to simulate the multi pass welding,and the test is carried out.The results show that the welding deformation of multi pass welding is determined by the welding process parameters and residual stress release.