ANALISIS STRUKTUR MIKRO DAN KEKERASAN HASIL PENGELASAN SHIELDED METAL ARC WELDING (SMAW) DENGAN VARIASI KECEPATAN POLISHING TERHADAP BAJA AISI 1020

ARIYO WAHYU, NUGROHO and Gunawan, Gunawan (2025) ANALISIS STRUKTUR MIKRO DAN KEKERASAN HASIL PENGELASAN SHIELDED METAL ARC WELDING (SMAW) DENGAN VARIASI KECEPATAN POLISHING TERHADAP BAJA AISI 1020. Undergraduate thesis, Sriwijaya University.

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Abstract

This study aims to analyse the impact of speed and polishing time variations on the microstructure and hardness of AISI 1020 steel produced by Shielded Metal Arc Welding (SMAW). Steel specimens were welded using E7016 electrodes, then polished at speeds of 570 rpm, 750 rpm, and 1043 rpm for 5, 10, and 15 minutes. Evaluation was carried out by observing the microstructure using an optical microscope and Vickers hardness testing in three areas: base metal, Heat Affected Zone (HAZ), and fusion zone. Observations showed that ferrite and pearlite dominated the microstructure. Polishing for 15 minutes at 750 rpm produced the best microstructure with sharp grain boundaries and a smooth surface. The maximum hardness value in the HAZ region reached 137.33 VHN at 1043 rpm and 10 minutes, while the peak value in the base metal of 133.32 VHN was obtained at 750 rpm and 15 minutes. Generally, the HAZ exhibits a higher hardness level than the base metal, which is related to microstructural changes due to localised heating during the welding process. This study concludes that polishing speed and duration have a significant impact on the microstructure quality and hardness of the material. Ideal polishing can improve the microstructure sharpness and hardness through the effect of strain hardening, whereas excessive polishing can reduce hardness values. The findings of this study contribute to the improvement of metallographic sample preparation techniques on welding steel. Keywords: SMAW Welding, AISI 1020 Steel, Microstructure, Vickers Hardness, Polishing

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Pengelasan SMAW, Baja AISI 1020, Struktur Mikro, Kekerasan Vickers, Polishing.
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ1-1570 Mechanical engineering and machinery T Technology > TJ Mechanical engineering and machinery > TJ1125-1345 Machine shops and machine shop practice > TJ1125 General works T Technology > TJ Mechanical engineering and machinery > TJ1125-1345 Machine shops and machine shop practice > TJ1192 General works Materials used in machine and hand tools T Technology > TJ Mechanical engineering and machinery > TJ1125-1345 Machine shops and machine shop practice > TJ1280.M35 Grinding and polishing Abrasives
Divisions:	03-Faculty of Engineering > 21201-Mechanical Engineering (S1)
Depositing User:	Ariyo Wahyu Nugroho
Date Deposited:	27 Aug 2025 08:06
Last Modified:	27 Aug 2025 08:06
URI:	http://repository.unsri.ac.id/id/eprint/183376

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