航空超薄压气机叶片堆焊修复关键参数研究

热源功率、送丝速度、冷却速率是影响超薄压气机叶片堆焊修复质量的关键参数。通过建立数学模型,计算了不同送丝速度下堆焊高度的数值解。根据合金热物性参数和前期钛合金试验结果,推导出Inconel718合金的热输入范围。针对超薄叶片修复特征,选择送丝速度为2.54 mm/s时进行传热建模,求解出不同热输入下焊缝截面的最高温度分布曲线,分析得到与之相匹配的热输入数值。在此基础上,结合流体传热理论,求解出不同冷却流速下的流体温度和夹具等温线的变化,并得到熔池及焊缝截面最高温度随时间的变化曲线。结果显示:在热输入为431 W、送丝速度为2.54 mm/s、流体流速为4.6 L/min时,焊缝可达到较好的热循环效果。研究方法及结果为压气机叶片堆焊修复工艺设计提供参考,具有较好的工程应用价值。

Research on Key Parameters in Surfacing Repairing of Aero Ultra-thin Compressor Blades

Heat source power,wire feeding speed and cooling rate are the key parameters that affect the repair quality of ultra thin compressor blades surfacing.The mathematical model was established,and the numerical solution of surfacing height under different wire feeding speed was calculated.According to the thermal properties of the alloy and the results of the previous titanium alloy test,the heat input range of Inconel718 alloy was derived.According to the repair characteristics of ultra-thin blades,the wire feeding speed 2.54 mm/s was selected to build the heat transfer model.The maximum temperature distribution curve of the weld cross section under different heat input was solved,and the corresponding heat input values were obtained by analysis.On this basis,combined with the theory of fluid heat transfer,the change of fluid temperature and fixture isotherm under different cooling flow rates were solved,and the change curves of the maximum temperature of molten pool and weld section with time were obtained.The results show that when the heat input is 431 W,the wire feeding speed is 2.54 mm/s and the fluid flow rate is 4.6 L/min,better thermal cycling effect can be achieved in the weld zone.The research methods and results provide a reference for the design of surfacing repair process of compressor blades,which has a good engineering application value.