Transactions of Nanjing University of Aeronautics & Astronautics
Microstructure and Mechanical Property of Al-Cu-Li Alloy Joint by Laser Welding with Filler Wire
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Abstract:
The Al-Cu-Li alloy is welded by using laser beam welding， and the welding wire ER4043 is used as filler metal. The microstructure and mechanical property of welded joints are systematically investigated. Microstructure analyses show that the fusion zone is mainly composed of α-Al matrix phase and some strengthening phases including T， δ′， θ′， β′ and T1， etc. During welding， the weld formation and joint quality are obviously improved by the addition of Al-Si filler wire. The measurements of mechanical property indicate that， compared with that of the base metal （BM）， the microhardness in the weld zone is decreased to a certain extent. Under the appropriate welding parameters， the tensile strength of welded joint reaches 369.4 MPa， which is 67.8% of that of the BM. There are many dimples on the joint fracture surface， and it mainly presents the fracture characteristic of dimple aggregation.
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Project Supported:
This work was supported by the Key Research and Development Program of Zhenjiang City （No.GY2019004）.
Clc Number:
TG456.7
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