Abstract
High-strength aluminum alloy fabricated using spray deposition technology possesses many advantages, such as fine crystal grains, low component segregation, uniform microstructure, and small internal stress. In this study, spray-deposited 2195 Al-Cu-Li alloy in forged state was used and welded using the gas tungsten arc welding (GTAW) process to test and verify the features of the fusion joint. Quantitative analysis was carried out to evaluate the relationship between the local microstructures and performances of the fusion joint, which was composed of four zones: weld metal, fusion zone, heat-affected zone, and base metal. The characteristic quantities of each zone, including recrystallized grain fraction, grain sizes, grain misorientation angle, and Vickers hardness, and their distributions were considered as the key factors affecting the performance of the joint because of welding thermal cycle impact on the fusion joint. To recognize the metallurgical characteristics of spray-deposited alloy 2195, a statistical algorithm based on the concept of the Hall–Petch relationship was proposed to validate the actual test results, which include the correlation effects of both the filler wire and welding process. The correlation between the microstructures and performances of several characteristic quantities were evaluated by integrating the above characteristic information of the fusion joint under the strong coupling of multiple factors. Thus, the advantages of weldability of spray-deposited alloy 2195 using GTAW could be understood in detail.
Highlights
Al-Cu-Li alloy is a new high-strength material that possesses low density and high elasticity
The characteristic quantities of each zone, including the recrystallized grain fraction, grain sizes, grain misorientation angle, and Vickers hardness, and their distributions were considered as the key factors affecting the performance of the joint because of the impact of the welding thermal cycle on the fusion joint
The advantages of weldability of spray-deposited alloy 2195 using gas tungsten arc welding (GTAW) could be understood in detail
Summary
Al-Cu-Li alloy is a new high-strength material that possesses low density and high elasticity. Alloy 2195, which belongs to the Al-Cu-Li-Ag-Mg series, has been used in lightweight fuel tank structural parts of aerospace vehicles [1,2,3,4,5] In this application, the cylinder and vessel head are welded with bending rolled plates after spin forming, whereas the connectors such as flanges and connecting rings formed by forging are assembled and welded to these parts. The cylinder and vessel head are welded with bending rolled plates after spin forming, whereas the connectors such as flanges and connecting rings formed by forging are assembled and welded to these parts Fabrication of these parts through traditional melt casting and forging often result in defects such as component segregation, oxide inclusion, delayed cracking, and large residual stress. The advantages of weldability of spray-deposited alloy 2195 using GTAW could be understood in detail
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