ANALISIS STRUKTUR MIKRO DAN KEKERASAN HASIL PENGELASAN SHIELDED METAL ARC WELDING (SMAW) DENGAN VARIASI KECEPATAN POLISHING TERHADAP LOGAM STAINLESS STEEL 304

SAPUTRA, EKO and Gunawan, Gunawan (2025) ANALISIS STRUKTUR MIKRO DAN KEKERASAN HASIL PENGELASAN SHIELDED METAL ARC WELDING (SMAW) DENGAN VARIASI KECEPATAN POLISHING TERHADAP LOGAM STAINLESS STEEL 304. Undergraduate thesis, Sriwijaya University.

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Abstract

This study aims to determine the effect of polishing speed and time on the microstructure and hardness of AISI 304 type stainless steel material that has gone through the Shielded Metal Arc Welding (SMAW) method welding process. The main focus of this research is to evaluate how polishing parameters affect surface quality, microstructure appearzmce, and hardness values in the fusion zone, fusion line, and base metal areas. The polishing speeds used were 570 rpm, 750 rpm, and 1043 rpm with polishing times of 5 minutes, l0 minutes, and 15 minutes. Microstructural observations were performed using optical metallography, while hardness testing was performed using the Vickers method. The results of the observations showed that the microstructure consisted of austenite and ferrite phases, with increased grain boundary sharpness as the polishing time increased.'The best results were obtained at a speed of 750 rpm for l5 minutes. The hardness testing showed that the highest hardness value in the fusion zone, 198.35 VHN, was obtained at a speed of 1043 rpm for 15 minutes. Meanwhile, the highest hardness in the fusion line region, 201.15 YI{N, occurred at a speed of 1043 rpm for 15 minutes. The fusion line generally exhibits higher hardness than the base metal, attributed to phase transformation caused by the thermal effects of welding. This study concludes that polishing speed and time significantly influence the microstructure appearance and surface hardness results. Keywords: SMAW Welding, AISI 304 Stainless Steel, Polishing, Microstructure, Vickers Hardnes

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Pengelasan SMAW, Baja Tahan Karat AISI 304, Pemolesan, Struktur Mikro, Kekerasan Vickers
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 > 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:	Eko Saputra
Date Deposited:	25 Aug 2025 04:06
Last Modified:	25 Aug 2025 04:06
URI:	http://repository.unsri.ac.id/id/eprint/183159

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