行波管阴极组件激光焊接残余应力及其对结构强度的影响分析

发布时间：2018-05-25 05:24

本文选题：行波管 + 阴极组件　；参考：《真空科学与技术学报》2017年09期

【摘要】：对行波管阴极钼筒和钽支撑筒的焊接材料及焊接工艺进行了研究,并用数值模拟方法对焊接结构的残余应力进行了分析,获得焊接残余应力值及其分布,并与试验值进行了比对,仿真结果与试验结果一致。同时将残余应力结果作为预应力加载到行波管阴极组件上,分析了其对结构强度的影响。结果表明:焊接残余应力使阴极组件结构在实际工作中的应力值增大且应力分布发生了变化,在残余应力的影响下,钽支撑筒在高温工作时的应力由332变化为412 MPa,增幅达24%,而且最大应力的位置也由钽爪内表面转移到钽爪拐角处。而六个钽支撑爪子的外表面(焊接处)由于残余应力最大,该处应力值也由101增加到250 MPa,增幅高达150%。因此阴极组件中钽支撑筒与阴极钼筒的焊接处很容易因应力值过大而失效,需要对焊接处残余应力进行消除和控制并对结构进行加固设计。
[Abstract]:The welding materials and welding process of the cathode molybdenum tube and the tantalum support tube of the traveling wave tube are studied. The residual stress of the welded structure is analyzed by numerical simulation method, and the welding residual stress value and its distribution are obtained. The simulation results are in agreement with the experimental results. At the same time, the effect of residual stress on the structure strength is analyzed by loading the residual stress as the prestressing force on the TWT cathode assembly. The results show that the welding residual stress increases the stress value and the stress distribution of the cathode assembly structure in practice, and under the influence of the residual stress, The stress of tantalum support tube changed from 332 to 412 MPA at high temperature, which increased by 24%, and the position of the maximum stress was transferred from the inner surface of tantalum claw to the corner of tantalum claw. The external surface of the six tantalum-supported paws (welding site) is increased from 101 to 250 MPA due to the maximum residual stress, an increase of 150 MPA. Therefore, the welding of tantalum support tube and cathode molybdenum tube in cathode assembly is easy to fail because of the excessive stress value, so it is necessary to eliminate and control the residual stress in the welding site and to strengthen the structure.
【作者单位】：华南理工大学电子与信息学院;工业和信息化部电子第五研究所电子元器件可靠性物理及其应用技术重点实验室;
【分类号】：TN124

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