像增强管激光封接过程中的气密性研究

Research on air tightness of image intensifier tube during laser sealing

采用高功率YAG激光焊接机对高性能三代像管管壳后端(4J34可伐合金)与荧光屏屏环(4J49可伐合金)进行封接试验。研究了激光功率、脉冲宽度对焊接接头成型及表面热扩散的影响规律。研究表明:4J34合金与4J49合金表面成型质量在设备最大工作电流100 A,激光功率195 W及脉宽1.7 ms时最好,相对于激光功率,脉冲宽度对焊缝熔宽和熔深的影响更加显著,接头焊接中心区硬化最为严重,其硬度最大,热影响区次之。

A high-power YAG laser welding machine was used to seal the back end of the high performance third generation image tube(4J34 kovar alloy)and the fluorescent screen ring(4J49 kovar alloy).The effects of laser power and pulse width on welding joint forming and surface thermal diffusion were studied.The results show that the surface forming quality of 4J34 alloy and 4J49 alloy is the best when the maximum operating current is 100 A,the laser power is 195 W and the pulse width is 1.7 ms.Compared with the laser power,the pulse width has a more significant effect on the weld width and weld depth.The hardening in the welding center is the most serious,and the hardness is the lagest,followed by the heat affected zone.