焊接环境湿度对A7N01S-T5铝合金MIG焊接接头性能影响  

Humidity under welding environment influence on MIG welding joint performance of A7N01S-T5 aluminum alloy

作　　者：陶传琦[1] 张明月[2] 陈辉[2] 

机构地区：[1]南车青岛四方机车车辆股份有限公司,山东青岛266111 [2]西南交通大学材料科学与工程学院,四川成都610031

出　　处：《电焊机》2014年第11期142-146,共5页Electric Welding Machine

摘　　要：采用单脉冲MIG焊,在环境焊接实验室内对高速列车用铝合金材料A7N01S-T5进行焊接,焊接环境相对湿度为50%、60%、70%、80%、90%,对所焊接头进行拉伸、冲击、硬度等力学性能研究。结果显示接头强度随着相对湿度的增加先降低后有所回升;接头硬度随湿度增加无明显变化规律。分析原因:随湿度变化,焊缝内气孔的数量、大小及分布形态变化是导致接头性能变化的主要原因。Adopting the single pulse MIG,the A7N01S-T5 which is used on high-speed train was welded in the environmental laboratory,the welding environment relative humidity was 50％,60％,70％,80％,90％.Conventional mechanical properties of welded joint such as tensile,impact were tested,results show that joint strength increased at first and then decreased with the increase of relative humidity,welding joint under different conditions have similar hardness.Analysis shows that：changes of the number,size and shape of the porosity with humidity changing in weld is a major cause of joint performance changing.

关 键 词：A7N01S-T5铝合金 湿度 力学性能 气孔 

分 类 号：TG404[金属学及工艺—焊接]