Mechanical Characterization of Duplex Stainless Steel Joined by Gas Tungsten-arc Welding (GTAW) and Shielded Metal-arc Welding (SMAW): A Comparative Study

Jamilu Ya’u Muhammad¹ , Usman Shitu Adam² , Haruna Abba Usman³ , Anas Abdullahi Muhammad⁴ , Abubakar Abdulkarim⁵

1. Dept. of Mechanical Engineering, Nigerian Army University, Biu, Borno State, Nigeria.
2. Dept. of Mechanical Engineering, Nigerian Army University, Biu, Borno State, Nigeria.
3. Dept. of Mechanical Engineering, Nigerian Army University, Biu, Borno State, Nigeria.
4. Dept. of Welding and Fabrication, Kano State Polytechnic, Kano, Kano State, Nigeria.
5. Dept. of Electrical Engineering, Bilyaminu Usman State Polytechnic, Hadejia, Jigawa State, Nigeria.

Section:Research Paper, Product Type: Journal-Paper
Vol.10 , Issue.1 , pp.37-41, Mar-2023

Online published on Mar 31, 2023

Copyright © Jamilu Ya’u Muhammad, Usman Shitu Adam, Haruna Abba Usman, Anas Abdullahi Muhammad, Abubakar Abdulkarim . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
Stainless steel is among most applicable materials in industries due to its good mechanical properties. The present study compared the mechanical properties of duplex stainless steel when joined together by using gas tungsten-arc welding and shielded metal-arc welding. Two duplex stainless steel were used in this work, whereby each sample was cut to form V-groove butt for welding purpose. After welding of the sample, lubricating oil is used as quencher for 30 minutes before undergoing for the analysis. A microstructure study was carried out by scanning electron microscopy (SEM). The average ferrite volume proportion attained in the GTAW weld zone is greater than that of SMAW. The tensile strength, hardness, and energy absorbed in impact test in the GTAW were all higher than that of SMAW. It is recommended that for the good transformation of the ferrite-austenite, the cooling rate should be high in each welding process.

Key-Words / Index Term :
Hardness, Impact Test, Microstructure, Tensile Strength, Weld Zone

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