【摘要】 根据YAG激光-TIG复合热源焊接的物理特征,建立了基于旋转高斯体热源与高斯面热源相结合的新型复合热源焊接模型。该模型的建立并非简单的热源叠加,而要考虑材料本身特性与复合焊接特点。在此基础上,针对镁合金AZ31B进行了复合热源焊接温度场、焊缝断面形状的数值模拟,提出了热源模型建立过程中的参数修改建议。与实测结果比较表明建立在双热源基础上的复合热源模型能准确地模拟镁合金的复合焊接过程;数值模拟结果验证了镁合金复合热源焊接高速、能量增强和热影响区窄的特点。更多还原

【Abstract】 A new heat source model of laser-TIG hybrid welding that based upon rotary-Gauss body heat source model and Gauss area heat source is established. The model must consider the physical characteristics of material and hybrid welding because two heat sources are not repeated addition simply. On this basis, the numerical simulation of hybrid welding temperature field and welding seam sectional form is performed and the advice of parameters modification is brought forward. Compared with the experimentally measured value, the result shows that the new model can simulate the AZ31 magnesium alloy hybrid welding accurately. The characteristics of hybrid welding including high welding speed, energy increased and narrow heat affected zone are verified by the calculated result of numerical simulation.更多还原