Study on the Microstructure and Mechanical Properties of 2195 Al-Li Alloy Tungsten Inert Gas Welded Joints
In response to the high sensitivity of joint cracks and poor mechanical properties of T8 2195 Al-Li alloy during argon arc welding,the development of 2195 Al-Li alloy welding wire was carried out,and the microstructure,crack resistance,and comprehensive mechanical properties of the joint were studied.The results indicate that the 2195 Al-Li alloy fusion welding joint is mainly composed of α-Al,Al2Cu and Al3(Ti,Zr)phases,it has excellent crack resistance and mechanical properties.Its crack sensitivity K1 is less than 1％,K2 is 0％,and the tensile strength of the joint at room temperature is about 390 MPa,and elongation is 6.3％.The development of BJ-4505 welding wire provides technical support for the engineering application of 2195 Al-Li alloy.
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