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分析了水下焊接温度场热源分布模式,选择双椭圆高斯体作为热源分布模型。讨论了影响水下焊接温度场的几个因素;水对电弧热效率影响不大,对流系数随着工件和水之间的温度差变化而变化,水对流使得熔池迅速凝固。使用ANSYS软件作为数值模拟工具,利用APDL语言编写了热源加载子程序和施加变化对流系数的子程序。试验表明,计算结果与实测结果误差较小。
The heat source distribution mode of underwater welding temperature field was analyzed, and the double oval Gauss body was selected as the heat source distribution model. Several factors affecting the temperature field of underwater welding are discussed. Water has little effect on the thermal efficiency of the arc. The convection coefficient changes with the temperature difference between the workpiece and the water. The convection makes the molten pool rapidly solidify. Using ANSYS software as a numerical simulation tool, a program of heat source loading subroutine and a subroutine of applying varying convection coefficient were programmed by using APDL language. Experiments show that the calculated results and the measured results less error.