激光+GMAW复合热源焊焊缝成形的数值模拟Ⅰ.表征激光作用的体积热源分布模式

NUMERICAL SIMULATION OF WELD FORMATION IN LASER+GMAW HYBRID WELDINGⅠ.Volumetric Distribution Mode Describing Laser Thermal Action

为了建立激光+GMAW电弧复合焊接的体积热源作用模式,根据激光深熔焊接的焊缝形状特征,分析了激光焊接的热源作用特点,提出了4类新的体积热源分布函数.建立了激光焊接温度场的数值分析模型,计算出了4类体积热源模式下的激光焊缝形状尺寸,与实测结果进行了对比.发现提出的4类体积热源模式能够较好地对激光焊接过程中激光热源对焊缝成形的作用进行表征,是恰当的和适用的.

To develop the volumetric heat source mode for laserTGMAW hybrid welding, four new kinds of distribution functions of volumetric heat sources are proposed after considering the geometry characteristic of laser deep-penetration welds and analyzing the action features of heat source in laser welding. Through numerical analysis of temperature profiles in laser welding, the geometry and dimension of weld cross sections in laser welding are obtained under the conditions corresponding to the four kinds of distribution functions of volumetric heat sources. After comparing the predicted to the experimental results, it is found that the proposed four kinds of volumetric heat source modes are appropriate and adaptive in characterizing the effect of laser thermal action on weld formation.