线能量对A7N01铝合金焊接接头组织及性能的影响  

Effect of Line Energy on the Microstructure and Property of A7N01 Aluminum Alloy Joint

作　　者：周辉 李涛 马传平[2] 付正鸿[2] Hui Zhou;Tao Li;Chuanping Ma;Zhenghong Fu(CRRC Qingdao Sifang Co., Ltd., Qingdao Shandong;College of Materials Science and Engineering, Southwest Jiaotong University, Chegndu Sichuan)

机构地区：[1]中车青岛四方机车车辆股份有限公司,山东青岛 [2]西南交通大学材料科学与工程学院,四川成都

出　　处：《机械工程与技术》2017年第1期53-59,共7页Mechanical Engineering and Technology

摘　　要：通过对A7N01S-T5铝合金不同线能量条件下双脉冲MIG焊(熔化极惰性气体保护焊)对接接头组织和力学性能的比较,得到以下结论:适中的线能量可以得到较为美观的焊缝表面成型;线能量的增大,促进了焊缝内第二相的析出,树枝晶也随之增多,同时也促进了热影响区晶粒的长大;而在较低的线能量条件下得到了相对较好的综合力学性能。The microstructure and properties of A7N01-T5 alloy double pulse MIG (Metal Inert-gas) welding butt joint under different line energy were compared. Results were shown below: A beautiful weld surface topography could be got under moderate line energy;with the line energy increase, more second phases separate out in the joint and the dendrites also increase, and the grain growth of the HAZ was also promoted;while under low line energy condition, better comprehensive mechanical properties could be got.

关 键 词：A7N01S-T5铝合金 双脉冲MIG焊 接头组织 力学性能 

分 类 号：TG4[金属学及工艺—焊接]