【摘要】 为了研究强制对流对气体保护焊温度场的影响,通过红外热像仪检测了CO2气体保护焊的温度场,发现在熔池及其邻近区域温度呈圆锥型分布.在此实验结果的基础上,确定了2.0 mm的高斯热源热流分布参数.在详细分析多种对流边界条件下,通过ANSYS对有强制对流效果的气体保护焊温度场进行了数值模拟.确定了适用于有强制对流效果的气体保护焊的对流边界条件计算公式.对焊接温度场的峰值温度和t8/5等参数的实验结果与模拟结果对比分析表明,强制对流边界条件是气体保护焊温度场尤其是近缝区温度分布数值模拟的关键因素之一.更多还原

【Abstract】 To reveal the influence of forced convection on gas shielded arc welding temperature field,the infrared camera was used to investigate the temperature field of the base metal in CO2 arc welding.It was found that temperature distribution of the weld pool and adjacent area displayed cone shape.Based on the experimental result,the 2.0 mm heat flux distribution parameter of Gauss heat source was determined.And according to analysis of several convection boundary conditions using finite element method,the temperature field of gas shielded arc welding with forced convection was simulated.Moreover,the formulae were determined to calculate the convection boundary condition of the gas shielded arc welding with forced convection.The comparison was made between the experimental results and the simulation results of parameters including the peak temperature and t8/5 of the temperature field,showing that the correct boundary condition of forced convection is one of the key elements to simulate the temperature field of the gas shielded arc welding,especially temperature distribution around the weld pool.更多还原