摘要
激光选区熔化(SLM)增材制造技术常用于格栅、腔体结构、燃烧室组件等航空、航天、兵器领域复杂小型零件的制造。为了适应大尺寸零部件的制造,较为理想的方案是采用分段增材成形+拼焊连接的方案,针对SLM成形TC4钛合金进行了电子束焊接工艺验证研究,分析了SLM成形材料焊接气孔缺陷及其产生原因,探讨了不同焊接工艺对气孔缺陷的改善效果;经工艺优化后气孔数量和尺寸大幅降低,电子束焊接质量满足HB/Z 198Ⅰ级标准要求,接头表现出良好的室温拉伸和疲劳性能,验证了TC4钛合金SLM成形+电子束拼接混合制造技术应用的可行性。
Selective laser melting(SLM)additive manufacturing technology is commonly used in the manufacture of complex small parts in the fields of aviation,aerospace and weapons,such as grille,cavity structure,combustion chamber components,etc.In order to adapt to the manufacturing of large-size parts,the ideal scheme is to adopt segmented additive forming and tailor welded joint.In this paper,the electron beam welding(EBW)process of SLM formed TC4 titanium alloy is verified,the welding porosity defects and their reasons are analyzed,and the improvement effect of different welding processes on the porosity defects is discussed.After the process optimization,the number and distribution of porosities are analyzed.The results show that the number and size of porosities are greatly reduced,the quality of electron beam welding meets the requirements of HB/Z 198 for level I standard,and the joint shows good tensile and fatigue properties at room temperature.Through the analysis and research,the feasibility of the hybrid manufacturing technology of SLM and EBW in the field for aviation manufacturing is verified.
作者
张萍
李立航
ZHANG Ping;LI Lihang(AVIC Manufacturing Technology Institute,Beijing 100024,China)
出处
《航空制造技术》
CSCD
北大核心
2022年第1期118-124,共7页
Aeronautical Manufacturing Technology
关键词
激光选区熔化
电子束焊接
TC4钛合金
气孔缺陷
增材制造
Selective laser melting(SLM)
Electron beam welding(EBW)
TC4 titanium alloy
Porosity defects
Additive manufacturing
