摘要
采用氩弧焊的方法在窄间隙条件下,采用TIG填丝多层焊的方式实现了TC4厚板钛合金的优质连接.结果表明,通过优化焊接参数和合理的惰性气体保护方案设计,保证了接头的完整性与可靠性.通过宏观和微观金相分析,发现窄间隙焊接条件下晶粒生长遵循联生结晶生长规律;由于受到焊接热循环的作用,致使接头显微结构随着冷却速度变化呈现不同的组织结构;窄间隙TIG焊接头因啮合强化而使得接头强度得到提高,焊缝的平均强度达到母材的90%以上.
High-quality joint of thick TC4 titanium alloy plate was made by narrow-gap tungsten inert gas(TIG) welding with proper gas protection and welding parameters.Metallographic analysis of the resultant joints revealed the rules of grain growth and microstructure characteristics.The variation of the cooling speed resulted in different microstructures in the heataffected zone(HAZ).The tensile test showed that the average tensile strength of the joints reached 90% of that of the base metal,which was attributed to the mechanism of meshing strengthening during narrow-gap TIG welding of thick titanium alloy plate.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2012年第8期81-84,117,共4页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(50974046
50904020)
哈尔滨市青年科技创新人才资助项目(2009RFQXG050)
关键词
厚板钛合金
窄间隙TIG焊
组织
力学性能
thick titanium alloy plate
narrow-gap TIG welding
microstructure
mechanical property
