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ROTOR: JURNAL ILMIAH TEKNIK MESIN
Published by Universitas Jember
ISSN : 1979018x     EISSN : 24600385     DOI : -
Core Subject : Science, Engineering,
Automotive Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
ROTOR merupakan jurnal yang diterbitkan oleh Jurusan Teknik Mesin Universitas Jember yang memuat artikel ilmiah dalam bidang Konversi Energi, Design/Perancangan, Teknik Produksi, Material serta bidang lain yang terkait dengan Teknik Mesin. Semua naskah yang diterima ROTOR diterbitkan secara global dalam bentuk elektronik. Hasil penelitian yang diterbitkan dalam jurnal ini diharapkan dapat menambah khasanah pengetahuan di bidang Teknik Mesin serta menjadikan sarana bagi para profesional baik dari dunia usaha, pendidikan, ataupun peneliti untuk menyebarluaskan perkembangan ilmu pengetahuan dan teknologi di bidang Teknik Mesin melalui publikasi hasil penelitian.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 2 Documents
 1 
Search results for , issue "Vol. 18 No. 1 (2025)" : 2 Documents clear
THE EFFECT OF ADDITION OF BLACK TIN (Pb) IN BRONZE ALLOYS WITH HIGH TIN CONTENT ON IMPACT STRENGTH AND MICROSTRUCTURE Fahrezi, Michael
ROTOR Vol. 18 No. 1 (2025)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

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Abstract

High-tin bronze (CuSn), especially with tin content above 17%, is commonly used in industries for making gamelan and bells due to its excellent acoustic properties. However, this alloy has drawbacks such as high cost and brittleness, which can cause cracking during forging and use. This study investigates the effect of adding lead (Pb) on the impact strength and microstructure of high-tin bronze alloys. Lead was chosen because it is cheaper than tin, helps reduce porosity, and can improve mechanical properties. Variations of Pb added were 5%, 10%, and 15%. The impact strength was tested using the Charpy impact test, and the microstructure was examined with a metallurgical microscope. Results showed that adding Pb improved the impact strength, with the composition of 80% Cu, 20% Sn, and 10% Pb achieving the highest impact strength of 0.0274 Joule/mm², compared to 0.0164 Joule/mm² in the pure alloy. The 10% Pb addition also created a uniform Pb distribution. However, adding more than 10% Pb reduced the impact strength, making the alloy less optimal. Therefore, 10% Pb provided the best balance between mechanical performance and microstructure. Keywords: Copper (Cu), white tin (Sn), lead (Pb), impact, microstructure
THE EFFECT OF MIG WELDING CURRENT VARIATIONS ON THE HARDNESS AND MICRO-STRUCTURE TESTS OF ST 37 STEEL Triyoko Budi Wibowo
ROTOR Vol. 18 No. 1 (2025)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

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Abstract

This study investigates the effect of welding current variations on the hardness and microstructure of ST 37 steel using Metal Inert Gas (MIG) welding. The experimental method was applied, where three current variations (100 A, 110 A, and 120 A) were used to weld ST 37 steel specimens. The specimens were then tested for hardness using the Vickers hardness test and examined for microstructural changes using an optical microscope. The results show that higher welding currents increase hardness, with the highest Vickers hardness value recorded in the heat-affected zone (HAZ) at 120 A (399.56 VHN). Microstructural analysis revealed the presence of ferrite and pearlite phases, with a higher pearlite fraction in the weld metal and HAZ, leading to increased hardness. This study provides insight into optimizing welding parameters to enhance the mechanical properties of welded steel structures. Keywords: MIG welding, welding current, hardness test, ST 37 steel, microstructure

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