In order to improve the maintenance-free period in the storage of missile-borne travelling wave tubes(TWTs)and reduce the maintenance cost,relative research is carried out from the aspects of structure de-sign,process optimization and process flow standardization.By adopting lap welding structure,the air leakage caused by TWT structure is avoided to some extent;by optimizing welding process,parts processing and assem-bly process,the reliability of TWTs is improved.The qualified products are verified and screened out by means of ion current detection.The accelerated storage life verification test indicates that the developed missile-borne TWTs can meet the maintenance-free requirement of 17 years.The missile-borne TWTs have been applied in a certain type of missiles and can meet the practical requirements.
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