GH4169镍基高温合金脉冲激光焊工艺参数优化
2020-11-10
作者：吴承隆，尹浩，黄泽涵
单位：福州大学机械工程及自动化学院
摘要：以GH4169镍基高温合金为研究对象，根据其上宽下窄的喇叭状焊缝截面，建立高斯圆柱体组合热源模型。通过正交试验方法，研究不同的焊接工艺参数匹配对GH4169镍基高温合金脉冲激光焊接温度场及接头拉伸强度的影响。结果表明，占空比对焊缝力学性能的影响最显著，其次是激光功率，最后是焊接速度。最佳工艺参数方案为A3B2C3，即激光功率1200W，焊接速度10mm/s，占空比35%。模拟结果表明，随着热源的接近，焊接中心区域温度迅速升至熔点；移走热源后，温度迅速下降，而焊缝周围区域的加热速度与冷却速度较为缓慢，符合脉冲激光焊能量集中和热传导传热的特性。采用熔合线准则验证了所建模型的准确性，误差在5%以内，能够准确地反映脉冲激光焊接GH4169镍基高温合金的瞬态温度场，为工艺参数的选择提供了依据。
关键词：GH4169；脉冲激光焊；正交试验；温度场
中图分类号：TG456.7；TH162文献标志码：ADOI：10.3969/j.issn.1000-7008.2020.10.007
Process Parameter Optimization of GH4169 Pulse Laser Welding
Wu Chenglong，Yin Hao，Huang Zehan
Abstract:Taking GH4169 nickelbase superalloy as the research object，and based on the hornlike shape of the weld section which is wider at top，the Gaussian cylinder combined heat source model is established.And by orthogonal test method，the effect of different welding parameters on GH4169 laser welding temperature field and the joint mechanical properties is investigated.The results show that the duty cycle is the most significant factor affecting the mechanical properties of the weld seam，the effects of the laser power and welding speed are less significant sequentially.The best process parameter scheme is A3B2C3，ie.，the laser power is 1200W，the welding speed is 10mm/s，and the duty cycle is 35%.Simulation results show that the temperature of the central weld zone rises quickly to the melting point as the heat source approaches while the temperature decreases rapidly as the heat source is removed.The heating and the cooling rates are slow around the weld seam，which is in line with the characteristics of energy concentration and heat transfer of pulse laser welding.The correctness of the model is verified by fusion line criteria，and the error is within 5%，so the model can accurately reflect the transient temperature field of GH4169 pulse laser welding，and provide a basis for the selection of process parameters.
Keywords:GH4169；pulse laser welding；orthogonal test；temperature field