In this work,the CMT-P composite arc additive manufacturing nickel base alloy GH4169 was studied.The process parameters such as wire feeding speed,welding speed and pulse number were considered comprehensively,and the forming quality such as distortion and forming accuracy was taken as the evaluation index.The process parameters were optimized by using the central composite response surface method.The regression model of distortion and forming accuracy was established,and the monomer and interaction effects of process parameters on forming quality were analyzed.The results show that the most significant factor affecting the amount of distortion is the wire feed speed,followed by the number of pulses,and the welding speed has the least influence.The influence of pulse number on forming accuracy is obviously greater than that of wire feeding speed and welding speed,and the interaction between wire feeding speed and pulse number is significant.Based on the comprehensive optimization objective,the optimal parameter combination is obtained:wire feed speed 3.5 m/min,welding speed 5.8 mm/s,pulse number 30.The relative errors of distortion amount and forming precision are 10.3％ and 4％,respectively,which shows that the model is correct.
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