Pengaruh Kuat Arus Pengelasan GMAW Terhadap Sifat Mekanik Dan Struktur Mikro Pada Baja AISI 1041 Dengan Metode Las Trasnfer Short Circuit

Firdaus, Muhammad Thoriq (2025) Pengaruh Kuat Arus Pengelasan GMAW Terhadap Sifat Mekanik Dan Struktur Mikro Pada Baja AISI 1041 Dengan Metode Las Trasnfer Short Circuit. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Gas Metal Arc Welding (GMAW) merupakan salah satu metode pengelasan yang banyak digunakan pada baja karbon, termasuk AISI 1041. Penelitian ini bertujuan untuk menganalisis pengaruh variasi kuat arus pengelasan terhadap sifat mekanik, kekerasan, dan struktur mikro baja AISI 1041. Variasi arus yang digunakan adalah 140 A, 160 A, dan 180 A. Perbedaan kuat arus memengaruhi heat input yang berperan dalam pembentukan struktur mikro dan sifat mekanik sambungan las. Hasil penelitian menunjukkan bahwa variasi kuat arus berpengaruh terhadap nilai yield stress, ultimate tensile strength, dan kekerasan. Nilai yield stress tertinggi diperoleh pada arus 140 A sebesar 349,8 MPa, sedangkan ultimate tensile strength dan kekerasan tertinggi diperoleh pada arus 160 A, masing-masing sebesar 429,3 MPa, 229 HV pada weld metal, dan 185,3 HV pada HAZ. Seluruh spesimen mengalami patah pada base metal, yang menunjukkan bahwa kekuatan sambungan las lebih tinggi dibandingkan logam induk. Struktur mikro hasil pengelasan didominasi oleh fasa ferrite dan pearlite, dengan variasi ukuran butir akibat perubahan heat input.
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Welding Gas Metal Arc Welding (GMAW) is one of the widely used welding methods for carbon steel, including AISI 1041. This study aims to analyze the effect of welding current variation on the mechanical properties, hardness, and microstructure of AISI 1041 steel. The welding currents used were 140 A, 160 A, and 180 A. Variations in welding current influence the heat input, which plays an important role in the formation of microstructure and the mechanical properties of the welded joint. The results show that welding current variation affects the yield stress, ultimate tensile strength, and hardness values. The highest yield stress was obtained at a current of 140 A, reaching 349.8 MPa, while the highest ultimate tensile strength and hardness were achieved at 160 A, with values of 429.3 MPa, 229 HV in the weld metal, and 185.3 HV in the heat-affected zone (HAZ). All tensile test specimens fractured in the base metal, indicating that the strength of the welded joint was higher than that of the base material. The microstructure of the welded joint was dominated by ferrite and pearlite phases, with variations in grain size resulting from changes in heat input.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Gas Metal Arc Welding (GMAW), Baja AISI 1041, Kuat arus pengelasan, Sifat Mekanik, Struktur Mikro ======================================================================== GMAW, AISI 1041 Steel, Welding Current, Mechanical Properties, Microstructure
Subjects:	T Technology > TS Manufactures T Technology > TS Manufactures > TS227 Welding. T Technology > TS Manufactures > TS320 Steel--Metallurgy.
Divisions:	Faculty of Vocational > Mechanical Industrial Engineering (D4)
Depositing User:	Muhammad Thoriq Firdaus
Date Deposited:	30 Mar 2026 05:40
Last Modified:	30 Mar 2026 05:40
URI:	http://repository.its.ac.id/id/eprint/132748

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