耦合腔速调管腔体组件焊接工艺技术改进

为了避免在双间隙耦合腔中的无氧铜腔体支架与漂移通道组件之间的焊接错位,在焊接前首先采用模具将无氧铜腔体支架和漂移通道组件之间的相对位置控制在设计要求范围内,采用激光预焊接方法将无氧铜腔体支架和漂移通道组件初步固定为一个整体,随后除去模具并设置焊料,最后再置入氢炉中进行焊接。这种方法高温状态不使用模具,免除了因为模具与无氧铜腔体支架和漂移通道组件的不同程度的热膨胀所造成的焊接错位,结合合理的焊接结构的设计及焊接工艺参数的优化,能够确保无氧铜腔体支架和漂移通道组件的一次焊接成功,免除了因为补焊造成的焊料堆积,在焊接后无位错、无变形,尺寸公差满足设计要求,进而能够保证双间隙耦合腔的宽频带性能。

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.