Indian Welding Journal

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Mechanical Properties and Microstructural Evolution in Al-Cu-Li 2195 Alloy GTA and FSW Welds


Affiliations
1 Materials & Metallurgy Group, Vikram Sarabhai Space Centre, ISRO, Trivandrum, India
2 India Indian Institute of Technology Madras, Chennai - 600 032, India
     

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Aerospace and launch vehicles structures demands materials with low density and high strength. 2195 is an advanced Al-Cu-Li alloy, considered as a potential material for launch vehicle structures due to low density and high strength. However, the fusion weldability of this alloy is not as simple as conventional 2219 alloy. Porosity and solidification cracking are main concerns in 2195 alloy with respect to weldability. In this present work, weldability issues are addressed to minimise their effect. 2195 alloy is welded by gas tungsten arc welding (GTAW) and friction stir welding (FSW) using optimised process parameters. Weld tensile properties of GTA and FSW welds were evaluated in as-weld condition. Hardness survey across the welds was performed. Microstructural analysis of GTA and FSW welds were carried out. Effect of tool rotation speed and tool travel speed on mechanical properties was studied.

Keywords

2195 Alloy, Gas Tungsten Arc Welding (GTAW), Friction Stir Welding (FSW), Weldability.
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  • Mechanical Properties and Microstructural Evolution in Al-Cu-Li 2195 Alloy GTA and FSW Welds

Abstract Views: 420  |  PDF Views: 8

Authors

M Agilan
Materials & Metallurgy Group, Vikram Sarabhai Space Centre, ISRO, Trivandrum, India
Gandham Phanikumar
India Indian Institute of Technology Madras, Chennai - 600 032, India
D. Sivakumar
Materials & Metallurgy Group, Vikram Sarabhai Space Centre, ISRO, Trivandrum, India

Abstract


Aerospace and launch vehicles structures demands materials with low density and high strength. 2195 is an advanced Al-Cu-Li alloy, considered as a potential material for launch vehicle structures due to low density and high strength. However, the fusion weldability of this alloy is not as simple as conventional 2219 alloy. Porosity and solidification cracking are main concerns in 2195 alloy with respect to weldability. In this present work, weldability issues are addressed to minimise their effect. 2195 alloy is welded by gas tungsten arc welding (GTAW) and friction stir welding (FSW) using optimised process parameters. Weld tensile properties of GTA and FSW welds were evaluated in as-weld condition. Hardness survey across the welds was performed. Microstructural analysis of GTA and FSW welds were carried out. Effect of tool rotation speed and tool travel speed on mechanical properties was studied.

Keywords


2195 Alloy, Gas Tungsten Arc Welding (GTAW), Friction Stir Welding (FSW), Weldability.

References





DOI: https://doi.org/10.22486/iwj%2F2019%2Fv52%2Fi4%2F186789