Modification of Brazing Technology of Coupling Cavity Klystron:A Methodology Study

We reported a solution to the dislocation/deformation problems,originated from thermal expansion in brazing the joint of a drift-tunnel assembly and an oxygen-free copper supporting-ladder of coupling cavity klystron.The original work was to pre-fix the two workpieces,precisely positioned and aligned with stainless-steel mold,by laser spot welding.The pre-fixed workpieces,released from mold and pre-added with solder-wire,were brazed in hydrogen furnace.The influence of the laser welding conditions on the microstructures and mechanical properties of the brazed joint was investigated with scanning electron microscopy.The laser-welded and brazed samples were characterized,respectively.The results show that the newly-modified brazing technique outperforms the conventional one because of many technical strengths,including,but not limited to the dislocation/deformation/distortion free,precise tolerance,little redundant solder,low cost,and most importantly,better satisfying the design requirements of X-band coupling cavity klystron.