不同焊丝对LY12铝合金TIG焊接头组织与性能的影响  

Effect of Welding Wires on Microstructure and Mechanical Properties of TIG Welded Joint of LY12 Aluminum Alloy

作　　者：陈和[1] 杨成刚[1] 郑强[1] 何宇[1] 余爱武 

机构地区：[1]南昌航空大学轻合金加工科学与技术国防重点学科实验室,江西南昌330063

出　　处：《热加工工艺》2014年第9期159-161,共3页Hot Working Technology

基　　金：国家自然科学基金项目(51165038;51201087);省教育厅科技计划项目(GJJ13496;GJJ12453);航空科学基金项目(2011ZE56005)

摘　　要：采用4种焊丝对LY12铝合金进行TIG焊,并对焊接接头的显微组织及力学性能进行了研究。结果表明:在焊丝中添加Ti、Zr元素可以细化焊缝的组织。当用未含Ti、Zr或只含Ti元素的焊丝进行焊接时,焊缝组织为树枝晶,接头力学性能较差;当用含有Ti、Zr元素的焊丝进行焊接时,焊缝组织明显细化,为细小的等轴晶,显著提高了接头力学性能。LY12 aluminum alloy was welded by using four kinds of welding wires with TIG welding method. The microstructure and mechanical properties of the welded joint were investigated. The results show that Ti and Zr elements additions in welding wires can refine the microstructure of weld metal. The microstructure of weld metal was dendrites with welding wires ,without Ti, Zr or only with Ti. The mechanical properties of the welded joint is poor. The microstructure of the weld metal is finer with welding wires with Ti, Zr, which show fine equiaxed grains, then the mechanical properties of the welded joint greatly increase.

关 键 词：LY12铝合金 焊丝 显微组织 力学性能 

分 类 号：TG422.3[金属学及工艺—焊接] TG457.14