电焊机2025，Vol.55Issue(11)：54-63,10.DOI:10.7512/j.issn.1001-2303.2025.11.08
基于直热式单晶LaB6阴极的电子束焊接研究
Research on Electron Beam Welding based on Directly Heated Single Crystal LaB6 Cathode
摘要
Abstract
The application of directly heated single crystal lanthanum hexaboride(LaB6)cathodes in electron beam welding machines is deeply studied in this paper.Based on a original laboratory electron beam welding machine,a beam spot diam-eter measurement device was designed,and tests on the emission capacity of the electron gun,cathode life,and weld forma-tion were carried out.The results show that compared with tungsten(W)cathode,the LaB6 cathode not only has a smaller beam spot diameter and more concentrated electron beam energy,but also has a longer lifespan anda larger depth-to-width ratio of the weld seam.At an emission beam current of 5 mA,the beam spot diameter of the LaB6 cathode is only 1/5 that of the W cathode.Under the conditions of a welding power of 3.6 kW and a speed of 4 mm/s,the LaB6 cathode can easily pen-etrate a 20 mm thick stainless-steel plate,and the depth-to-width ratio of the weld is 2 times that of the W cathode.In addi-tion,the lifespan of the LaB6 cathode is greater than 100 h,approximately 10 times that of the W cathode.This studythat proves that the LaB6 cathode has significant advantages over the W cathode,providing significant reference value for the ap-plication of LaB6 cathodes in the field of electron beam welding.关键词
直热式阴极/单晶LaB6/电子束焊接/束斑直径/能量密度Key words
directly heated cathode/single crystal LaB6/electron beam welding分类
矿业与冶金引用本文复制引用
高静,肖立业,徐跃凡,段瑞滨,高广赞,左婷婷,茹亚东,高召顺,刘俊标,韩立..基于直热式单晶LaB6阴极的电子束焊接研究[J].电焊机,2025,55(11):54-63,10.基金项目
国家重点研发计划(2022YFF0709400) （2022YFF0709400）
中国科学院电镜技术联盟电镜技术培育项目 （）
