Development of Vacuum Brazing Process for R. F. Wave Guide Power Feed Components

摘要

10 MeV R.F. Linac for EBC is being developed by APPD. CDM had taken up the design and developmental work for manufacture of mechanical sub-assemblies/ components and final assembly. One such critical sub-assembly is power feed section of 10 MeV Electron LINAC. This paper describes the experiences of Centre for Design and Manufacture, BARC in development of power feed sub-assembly. This assembly involves development of critical permanent joint on different combinations of materials like OFHC copper, S.S.304 and Cupronickel. The joining techniques are developed for multiple joints which are in different planes by different routes, viz., (1) Vacuum brazing all joints at a time using silver-copper eutectic brazing filler, (2) Vacuum brazing by silver-copper eutectic brazing filler and palabraze brazing filler combination and (3) Vacuum brazing and E.B. Welding combination. The intricate shape, space limitations, high vacuum and leak tightness of joint, critical dimensions, geometrical features and tolerances gave a challenge for the development. CDM has successfully developed the assembly for 10 MeV Electron LINAC for Electron Beam Centre, Khargar. A large number of jigs, fixtures were designed for various components for achieving satisfactory results which will be discussed in detail in this paper.