The invention relates to a self-positioning vacuum
brazing technique for a multi-cavity electrical bridge
waveguide. The self-positioning vacuum
brazing technique comprises the following steps of preparing materials and finishing the
machining of an upper part and a lower part of the
waveguide; respectively carrying out surface treatment on the machined upper and lower parts of the
waveguide; producing
brazing filler metals according to overall dimensions of the upper part and the lower part of the waveguide and assembling the upper part and the lower part of the waveguide and the brazing filler metals; matching the assembled electrical bridge waveguide with a work fixture and placing the assembled electrical bridge waveguide and the work fixture into a vacuum aluminum brazing furnace; carrying out vacuum brazing on the multi-cavity electrical bridge waveguide according to a vacuum brazing temperature process curve; carrying out
numerical control machining on the shape of the waveguide and a ring
flange; drilling and carrying out electrochemical treatment. According to the self-positioning vacuum brazing technique disclosed by the invention, the ring
flange and a waveguide tube are integrally formed at one time, so that the
processing work procedures are simplified, and the production period is short; a groove and a shoulder are arranged, so that
self positioning is realized, combined times are reduced, and the
assembly precision is high; one-time
welding forming is realized by adopting vacuum brazing, and thus the deformation of cavities caused by multiple times of
welding is avoided; in addition, no brazing flux is needed, and thus the
corrosion of the brazing flux to the cavities is avoided, and the service life of the multi-cavity electrical bridge waveguide is prolonged.