Sains Malaysiana 50(9)(2021): 2743-2754

http://doi.org/10.17576/jsm-2021-5009-20

The Effects of In-Process Cooling during Friction Stir Welding of 7475 Aluminium Alloy

(Kesan Proses Penyejukan Dalam semasa Kimpalan Kacauan Geseran Aloi Aluminium 7475)

ASHISH JACOB¹, SACHIN MAHESHWARI¹, ARSHAD NOOR SIDDIQUEE², ABDULRAHMAN AL-AHMARI^3,4, MUSTUFA HAIDER ABIDI⁴*, SERGEY KONOVALOV⁵ & XIZHANG CHEN⁶

¹Division of Manufacturing Processes and Automation Engineering, Netaji Subhas University of Technology, (formerly Netaji Subhas Institute of Technology), New Delhi-110078, India

²Department of Mechanical Engineering, Jamia Millia Islamia (A Central University), New Delhi-110025, India

³Industrial Engineering Department, College of Engineering, King Saud University, Riyadh-11421, Saudi Arabia

⁴Raytheon Chair for Systems Engineering, Advanced Manufacturing Institute, King Saud University, Riyadh-11421, Saudi Arabia

⁵Department of Metals Engineering Material Science, Samara National Research University, Samara-443086, Russia

⁶School of Mechanical and Electrical Engineering, Wenzhou University, Zhejiang Province-325035, China

Diserahkan: 5 Januari 2020/Diterima: 3 Januari 2021

ABSTRACT

Certain age hardenable alloys such as AA7475 cannot be joined with perfection using fusion welding techniques. This requires non-conventional welding technique such as friction stir welding process to join these ‘difficult to weld’ alloys. In this study, three different cooling conditions i.e. cryogenic, sub-zero, and zero-degree Celsius temperature conditions have been analyzed to understand its impact on the welding process. In-process cooling was found to behave effectively and also enhanced the mechanical properties of the welded joints. A stable microstructure was clearly seen in the images observed under the metallurgical microscope. The weld efficiencies were found to be good in each of the samples which are indicative of a strong metallic joint. The effective cooling conditions employed had an overall positive impact on the joint.

Keywords: AA-7475; age-hardenable; friction stir welding; in-process cooling; joints cooling; liquid nitrogen

ABSTRAK

Aloi boleh dikeraskan seperti AA7475 sukar disambung dengan sempurna melalui teknik kimpalan lakuran. Ia memerlukan teknik kimpalan bukan konvensional seperti proses kimpalan kacauan geseran untuk menyambung aloi tersebut. Dalam kajian ini, tiga keadaan penyejukan yang berbeza, iaitu keadaan suhu kriogenik, sub-sifar dan sifar darjah Celsius telah dianalisis untuk memahami kesannya ke atas proses kimpalan. Proses penyejukan dalam didapati berkesan dan mempertingkatkan sifat mekanik sambungan terkimpal. Mikrostruktur yang stabil telah diperhati di bawah mikroskop metalurgi. Keberkesanan kimpalan yang baik telah diperhati pada setiap sampel yang menunjukkan sambungan logam yang kuat. Keadaan sejuk semasa kimpalan telah memberi kesan positif ke atas sambungan yang dilakukan.

Kata kunci: AA-7475; cecair nitrogen; kimpalan pengacauan geseran; penyejukan dalam proses; penyejukan sambungan

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*Pengarang untuk surat-menyurat; email: mabidi@ksu.edu.sa