6061/5052异种铝合金钨极惰性气体保护焊接头的组织与性能  

Microstructure and Property of Tungsten Inert Gas Welded Joint of 6061/5052 Dissimilar Aluminum Alloys

作　　者：梁成成 冯锡峰 林思洙 聂建辉 LIANG Chengcheng;FENG Xifeng;LIN Sizhu;NIE Jianhui(Department of Mechanical Engineering,Shanxi Engineering Vocational College,Taiyuan 030009,China;School of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030002,China;Department of Mechanical And Electrical Engineering,Jinzhong Vocational and Technical College,Jinzhong 030600,China)

机构地区：[1]山西工程职业学院机械工程系,太原030009 [2]太原理工大学材料科学与工程学院,太原030002 [3]晋中职业技术学院机电工程系,晋中030600

出　　处：《机械工程材料》2024年第8期30-34,共5页Materials For Mechanical Engineering

基　　金：山西省高等学校科技创新项目(2023L565);山西省教育科学“十四五”规划项目(GH-220519);山西省高等学校科技创新项目(2022L699)。

摘　　要：制备了6061/5052异种铝合金钨极惰性气体保护焊(TIG)接头,研究了接头的显微组织、晶粒尺寸、硬度、抗应力腐蚀性能和预腐蚀疲劳性能。结果表明:6061铝合金母材,焊缝和5052铝合金母材的平均晶粒尺寸分别为38.42,47.13,41.17µm;母材区显微硬度高于热影响区和焊缝区,硬度最小值(51 HV)出现在6061铝合金侧热影响区;接头在NaCl溶液和空气中应力腐蚀后,断裂位置均在6061铝合金侧距焊缝中心14 mm处,在NaCl溶液中的抗拉强度、屈服强度和断后伸长率略高于在空气中,抗应力腐蚀性能略强;随着NaCl溶液中HCl含量增加,焊接接头的晶间腐蚀深度增加,疲劳寿命缩短,断裂位置由焊缝区向5052铝合金母材转变。Tungsten inert gas(TIG)welded joint of 6061/5052 dissimilar aluminum alloys was prepared.The microstructure,grain size,hardness,stress corrosion resistance and pre-corrosion fatigue properties of the joint were studied.The results show that the average grain size of 6061 aluminum alloy base metal,weld and 5052 aluminum alloy base metal was 38.42,47.13,41.17µm,respectively.The microhardness of base metal was higher than that of heat affected zone and weld zone,and the minimum hardness(51 HV)appeared in the heat affected zone on the side of 6061 aluminum alloy.The fracture location of the joint was at the position which was 14 mm away from the weld center on the side of 6061 aluminum alloy after stress corrosing in both NaCl solution and air,and the tensile strength,yield strength,percentage elongation after fracture and corrosion resistance property in NaCl solution were slightly higher than those in air.With the increase of HCl content in NaCl solution,the intergranular corrosion depth of the welded joint increased,the fatigue life was shortened,and the fracture location changed from the weld zone to the 5052 aluminum alloy base metal.

关 键 词：6061/5052异种铝合金接头 钨极惰性气体保护焊 显微组织 硬度 耐腐蚀性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]