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

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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

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Inventory Code Barcode Call Number Location Status
2507005529T183376T1833762025Central Library (Reference)Available but not for loan - Not for Loan
Detail Information
Series Title
-
Call Number
T1833762025
Publisher
Indralaya : Prodi Teknik Mesin, Fakultas Teknik Universitas Sriwijaya.,
Collation
xxix, 57 hlm.; ilus,; tab, 29 cm
Language
Indonesia
ISBN/ISSN
-
Classification
620.107
Content Type
Text
Media Type
unmediated
Carrier Type
other (computer)
Edition
-
Subject(s)
Prodi Teknik Mesin
Properti dan kekuatan material teknik
Specific Detail Info
-
Statement of Responsibility
Other version/related
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