摘要
建立了基于微束等离子弧堆焊的增材制造系统,包括专用6自由度堆焊机器人、三路保护气氛通路(焊枪喷嘴、气体拖罩以及工装卡具气氛保护)以及配套视觉监测系统,进行Ti-6Al-4V钛合金制品增材制造工艺试验。结果表明,采用恒流模式与脉冲模式交替堆焊的方式,可以在有效控制热输入的前提下,实现钛合金制品的可控增材制造。堆焊层内部晶粒为粗大的柱状晶形态,其生长方向与焊接方向垂直,晶粒内部为网篮组织,各层间可观察到明显的层状形貌。氧化会使钛合金工件的强度与塑性下降,因此要注意加强气氛保护措施。
A additive manufacturing system was established based on micro-plasma arc surfacing,which consists of a customized robot possess six degrees of freedom,three paths of shielding gas(welding gun' s nozzle,gas shielding and fixture) and a visual inspection system,and Ti-6Al-4V titanium alloy parts were manufactured.The results show that a stable additive manufacturing process of titanium alloys parts can be implemented by alternately exerting the constant mode and pulse mode of micro-plasma arc welding.A coarse columnar dendritic zone is found in the interior of the cladding zone which grow perpendicular to welding direction.Basket-weave microstructure is found within the grains which show laminar feature between each weld beam.Oxidation decrease the strength and ductility of the titanium parts,which should be avoided by exerting shielding gas.
出处
《焊接》
北大核心
2016年第4期13-16,73,共4页
Welding & Joining
基金
教育部博士点基金资助项目(20130032110004)
关键词
微束等离子弧焊
钛合金
微观组织
力学性能
micro-plasma arc surfacing
titanium alloy
microstructure
mechanical properties
