Open Access Open Access  Restricted Access Subscription or Fee Access

Microstructure and Microhardness Investigation of Non-Weldable AA7075-T651 Alloy with Gas Tungsten Arc Welding


(*) Corresponding author


Authors' affiliations


DOI: https://doi.org/10.15866/ireme.v16i6.21905

Abstract


Materials with a high strength-to-weight ratio are of particular interest to the manufacturing industry. This requirement can be met by using low-density aluminium alloy materials, such as the 7XXX series. The non-weldable material AA7075 was chosen for this study. We planned to weld AA7075 material with ER5183 filler material and use Gas Tungsten Arc Welding to make the weld. A welded specimen's Parent Material (PM), Heat Affected Zone (HAZ), Temperature Heat Affected Zone (THAZ), and Weld Zone (WZ) were microscopically examined and hardness measurements were taken. This study revealed that ER5183 filler material was used to weld non-weldable AA7075 material, and the problem occurred after welding. Due to the sudden water quenching after welding, the weld develops hotcracked defects. The air-cooled weld had a lower microhardness than the water-cooled weld.
Copyright © 2022 Praise Worthy Prize - All rights reserved.

Keywords


Electron Microscopy; Non-Weldable Material; ER5183 Filler; GTAW; AA7075-T65; Microhardness Measurement

Full Text:

PDF


References


Sokoluk, M., Cao, C., Pan, S., Xiaochun L, Nanoparticle-enabled phase control for arc welding of unweldable aluminum alloy 7075, Nat Commun, 10, 98 (2019).
https://doi.org/10.1038/s41467-018-07989-y

Salgado L., J., Silva Hernandez, A., Lopez Monroy, F., Ojeda Elizarraras, J., & Tello Rico, J., Microstructural study in AA7075 alloys welded with different filler metals, MRS Advances, 4(55-56), 3017-3029, (2019).
https://doi.org/10.1557/adv.2019.371

Gharbi, O., Kumar Kairy, S., De Lima, P.R., Jiang D., Nicklaus J., Birbilis N., Microstructure and corrosion evolution of additively manufactured aluminum alloy AA7075 as a function of aging, npj Mater Degrad, 3, 40 (2019).
https://doi.org/10.1038/s41529-019-0101-6

Alatorre N., Ambriz R.R., Noureddine B., Talha A., Jaramillo D., Tensile Properties and Fusion Zone Hardening for GMAW and MIEA Welds of a 7075-T651 Aluminum Alloy, Acta Metall. Sin. (Engl. Lett.), 27, 694-704, (2014).
https://doi.org/10.1007/s40195-014-0103-x

Tekeli, Süleyman, Simsek, Ijlal, Simsek, Dogan, Ozyurek, Dursun, Effects of Different Solid Solution Temperatures on Microstructure and Mechanical Properties of the AA7075 Alloy after T6 Heat Treatment, High-Temperature Materials and Processes, vol. 38, no. 2019, 2019, pp. 892-896.
https://doi.org/10.1515/htmp-2019-0050

Saadat Z., Moghanaki S. K., Kazeminezhad M., Goodarzi M., & Afjeh S. M. B. G., Effect of two steps annealing on the microstructure and dynamic strain aging behavior of Al-6Mg alloy, Materials Science and Engineering: A, 798, 140097, (2020).
https://doi.org/10.1016/j.msea.2020.140097

Cevik, B., Gas tungsten arc welding of 7075 aluminum alloy: microstructure properties, impact strength, and weld defects, Materials Research Express, 5(6), 066540, (2018).
https://doi.org/10.1088/2053-1591/aacbbc

Farzadi, A., Correlation between precipitate microstructure and mechanical properties in AA7075-T6 aluminum alloy friction stir welded joints, Mat.-wiss. u Werkstofftech, 48: 151-162, (2017).
https://doi.org/10.1002/mawe.201700505

Wu, W., Chen, D., An Investigation into Microstructures and Properties of 7075-T6 during Friction Stir Welding, In Advanced Materials Research, Vol. 772, pp. 94-97, (2013).
https://doi.org/10.4028/www.scientific.net/AMR.772.94

Feng, A., Chen, D., Ma, Z., Microstructure and Cyclic Deformation Behavior of a Friction-Stir-Welded 7075 Al Alloy, Metall Mater Trans A 41, 957-971, (2010).
https://doi.org/10.1007/s11661-009-0152-3

Balsubramanian V., Ravisankar V., Madhusudan Reddy G., Effect of pulsed current and post weld aging treatment on tensile properties of argon arc welding high strength aluminum alloy, Material Science and Engineering A, 459, 19-34, (2006).
https://doi.org/10.1016/j.msea.2006.12.125

Balsubramanian V., Ravisankar V., Madhusudan Reddy G., Effect of postweld aging treatment on fatigue behavior of pulsed current welded AA7075 aluminum alloy joints, ASM International Journals, 17, 224-233, (2007).
https://doi.org/10.1007/s11665-007-9129-9

Balsubramanian V., Ravisankar V., Madhusudan Reddy G., Influences of pulsed current welding and post weld aging treatment on fatigue crack growth behavior of AA7075 aluminum alloy joints, International Journal of Fatigue, 30, 405-416, (2008).
https://doi.org/10.1016/j.ijfatigue.2007.04.012

Balsubramanian V., Ravisankar V., Madhusudan Reddy G., Effect of pulsed current welding on mechanical properties of high strength aluminum alloy, International Journal of Advanced Manufacturing Technology, 36, 254-262, (2008).
https://doi.org/10.1007/s00170-006-0848-0

Temmar M., Hadji M., Sahraoui T., Effect of post-weld aging treatment on mechanical properties of inert tungsten gas welded low thickness 7075 aluminum alloy joints, Materials and Design, 32, 3532-3536, (2011).
https://doi.org/10.1016/j.matdes.2011.02.011

Hu, B., Richardson, I.M. Hybrid Laser/GMA Welding Aluminium Alloy 7075. Weld World 50, 51-57 (2006).
https://doi.org/10.1007/BF03266536

K. S. Pujari, D.V. Patil, Gurunath Mewundi, Selection of GTAW process parameter and optimizing the weld pool geometry for AA 7075-T6 Aluminium alloy, Materials Today: Proceedings, Volume 5, Issue 11, Part 3, 2018, Pages 25045-25055.
https://doi.org/10.1016/j.matpr.2018.10.305

Kishore Babu, Mahesh Kumar Talari, D. Pan, Z. Sun, J. Wei, K. Sivaprasad, Microstructural characterization and grain refinement of AA6082 gas tungsten arc welds by scandium modified fillers, Materials Chemistry and Physics, Volume 137, Issue 2, 2012, Pages 543-551.
https://doi.org/10.1016/j.matchemphys.2012.09.056

Sharda Pratap Shrivas, Sanjay Kumar Vaidya, Ashish Kumar Khandelwal, Amit Kumar Vishvakarma, Investigation of TIG welding parameters to improve strength, Materials Today: Proceedings, Volume 26, Part 2, 2020, Pages 1897-1902.
https://doi.org/10.1016/j.matpr.2020.02.416

H. J. Harun, P.G. McCormick, Effect of precipitation hardening on strain rate sensitivity and yield behavior in an Al-Mg-Si alloy, Acta Metallurgica, Volume 27, Issue 1, 1979, Pages 155-159.
https://doi.org/10.1016/0001-6160(79)90067-1

Liang Zhang, Xiaoyan Li, Zuoren Nie, Hui Huang, Lanqiang Niu, Comparison of microstructure and mechanical properties of TIG and laser welding joints of a new Al-Zn-Mg-Cu alloy, Materials & Design, Volume 92, 2016, Pages 880-887.
https://doi.org/10.1016/j.matdes.2015.12.117

Ji-Kun Ding, Dong-Po Wang, Ying Wang, Hui Du, Effect of post weld heat treatment on properties of variable polarity TIG welded AA2219 aluminum alloy joints, Transactions of Nonferrous Metals Society of China, Volume 24, Issue 5, 2014, Pages 1307-1316.
https://doi.org/10.1016/S1003-6326(14)63193-9

Noor Zaman Khan, Arshad Noor Siddiquee, Zahid A. Khan, Ashim K. Mukhopadhyay, Mechanical and microstructural behavior of friction stir welded similar and dissimilar sheets of AA2219 and AA7475 aluminum alloys, Journal of Alloys and Compounds, Volume 695, 2017, Pages 2902-2908.
https://doi.org/10.1016/j.jallcom.2016.11.389

P. Vijaya Kumar, G. Madhusudhan Reddy, K. Srinivasa Rao, Microstructure, mechanical and corrosion behavior of high strength AA7075 aluminum alloy friction stir welds - Effect of post weld heat treatment, Defence Technology, Volume 11, Issue 4, 2015, Pages 362-369.
https://doi.org/10.1016/j.dt.2015.04.003

Paul A. Rometsch, Yong Zhang, Steven Knight, Heat treatment of 7xxx series aluminum alloys-Some recent developments, Transactions of Nonferrous Metals Society of China, Volume 24, Issue 7, 2014, Pages 2003-2017.
https://doi.org/10.1016/S1003-6326(14)63306-9

Bielawski, R., Rządkowski, W., Kowalik, M., Kłonica, M., Safety of Aircraft Structures in the Context of Composite Element Connection, (2020) International Review of Aerospace Engineering (IREASE), 13 (5), pp. 159-164.
https://doi.org/10.15866/irease.v13i5.18805

El-Kassas, A., Sabry, I., Mourad, A., Thekkuden, D., Characteristics of Potential Sources - Vertical Force, Torque and Current on Penetration Depth for Quality Assessment in Friction Stir Welding of AA 6061 Pipes, (2019) International Review of Aerospace Engineering (IREASE), 12 (4), pp. 195-204.
https://doi.org/10.15866/irease.v12i4.16362


Refbacks



Please send any question about this web site to info@praiseworthyprize.com
Copyright © 2005-2024 Praise Worthy Prize