Optimization of Brazing Process of Thin-walled Stainless Steel Pipe in the Sensing Part of Total Pressure of Aero-engine
Aero-engine total pressure sensing part is a component that converts the signal received by the pressure sensor into an electrical signal and transmits it to the main control system to improve aircraft perception and maneuverability.The material of the main structure of the total pressure sensing part is generally selected as thin-walled stainless steel pipes,which are made using flame brazing welding technology.This is greatly affected by the proficiency of personnel skills,so the consistency of product quality is poor.To improve product reliability and stability,a new approach of replacing flame brazing with vacuum brazing is proposed.The influence of brazing process parameters such as brazing temperature and holding time on the macroscopic formability of brazed joints and the evolution of metallographic microstructure is studied.The variation laws of wetting and spreading behavior on the surface of stainless steel base material and the filling behavior of brazing material are explored.The vacuum brazing process window is optimized,and the improvement effect of vacuum brazing process is verified through vibration test and airtightness test,which makes a beneficial exploration for the optimization of vacuum brazing process for thin-walled stainless steel pipes.
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