不锈钢管板接头电子束钎焊

应用自主开发的基于虚拟仪器的电子束钎焊系统，成功实现了不锈钢毛细管板接头的电子束钎焊。研究了电子束束流、加热时间、聚焦电流和扫描幅值等电子束钎焊工艺参数对钎焊接头质量的影响规律。试验结果表明，随着电子束输入功率密度的增加，钎角高度和BNi-2钎料向毛细管壁的扩散深度都逐渐增大。在优化的电子束钎焊规范下，不锈钢管板接头钎透率100％，毛细管无溶蚀产生。通过电子探针显微分析仪研究了电子束钎焊接头中各相的化学组成，钎焊接头主要由硼化镍相、硼化镍和硅化镍相、硼化铬相以及镍的固溶体组成。

Capillary electron beam brazing of stainless steel tube-to-plate joint

Stainless steel capillary tube-to-plate brazed joint by electron beam has been achieved using electron beam brazing system based on Virtual Instruments. Effects of electron beam brazing parameters including beam current, heating time, focus current and scanning amplitude on the quality of brazing joints are discussed. Experimental results show that fillet height and diffusion depth of BNi-2 filler metal to capillary tube wall both increase with electron beam input power density increasing. Penetration rate of the stainless steel tube-to-plate joint is up to 100% and erosion phenomena of capillary tube are not found when optimized processing parameters of electron beam brazing are adopted. Chemical composition of phases at brazed joint is also investigated by an electron probe microanalyser. Brazed joint consists of nickel boride, nickel silicide, chromium boride and solid solution.