Fatigue property comparison of TIG welded joints of magnesium alloy and aluminum alloy  

作　　者：王文先 张红霞 梁培阳 张兰 李晋永 

机构地区：[1]Key Laboratory of Interface Science and Engineering in Advanced Material, Ministry of Education. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024.

出　　处：《China Welding》2009年第4期26-32,共7页中国焊接（英文版）

基　　金：The work was supported by the National Natural Science Foundation of China （No. 50675148 ）.

摘　　要：The fatigue properties of the TIG welded joints of both AZ31B magnesium alloy and 5A06 aluminum alloy were investigated. The four types of welded joints were used in fatigue tests, such us butt joints, transverse cross joints, fillet joints and lateral connecting joints. The fatigue strengths at 2 × 10^6 cycles of the four welded joints of AZ31B magnesium alloy are 39. 0 MPa, 24. 4 MPa, 32. 1 MPa and 24. 2 MPa, which are 55. 0% , 42. 2%, 78. 0% and 50. 2% of that of 5A06 aluminum alloy, respectively. The fatigue strength levels at slope m = 3 of the aluminum alloy＇ s welded joints are mostly higher than the FAT recommended by the International Institute of Welding （ HW） , while those of the magnesium alloy＇ s welded joints are all lower than the FAT. It is indicated that the FAT of magnesium alloy＇ s welded joints should be established as early as possible in order to be applied in the design of magnesium alloy＇ s welded structures.The fatigue properties of the TIG welded joints of both AZ31B magnesium alloy and 5A06 aluminum alloy were investigated. The four types of welded joints were used in fatigue tests, such us butt joints, transverse cross joints, fillet joints and lateral connecting joints. The fatigue strengths at 2 × 10^6 cycles of the four welded joints of AZ31B magnesium alloy are 39. 0 MPa, 24. 4 MPa, 32. 1 MPa and 24. 2 MPa, which are 55. 0% , 42. 2%, 78. 0% and 50. 2% of that of 5A06 aluminum alloy, respectively. The fatigue strength levels at slope m = 3 of the aluminum alloy＇ s welded joints are mostly higher than the FAT recommended by the International Institute of Welding （ HW） , while those of the magnesium alloy＇ s welded joints are all lower than the FAT. It is indicated that the FAT of magnesium alloy＇ s welded joints should be established as early as possible in order to be applied in the design of magnesium alloy＇ s welded structures.

关 键 词：magnesium alloy aluminum alloy welded joint fatigue properties 

分 类 号：TG606[金属学及工艺—金属切削加工及机床] TH208[机械工程—机械制造及自动化]