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All Journal INDONESIAN JOURNAL OF APPLIED PHYSICS JTRM (Jurnal Teknologi dan Rekayasa Manufaktur) Jurnal Vokasi Mekanika Jurnal Polimesin
Ari Siswanto
Politeknik Manufaktur Bandung
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Hardening of bucket teeth made from creusabro 8000 steel by using the induction hardening method Darma Firmansyah Undayat; Cecep Ruskandi; Ari Siswanto
Jurnal POLIMESIN Vol 21, No 3 (2023): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i3.3672

Abstract

Excavators are often used in mining projects such as for penetrating, excavating, dredging, gouging, and crushing mineral rocks. Bucket teeth are an excavator component that is often being replaced due to failure. The most common failure mode that occurred in bucket teeth was wear on the tip or front section of it. To reduce the wear of the bucket teeth material then its hardness should be increased. As the hardness value increases, the resistance to wear increases. The bucket teeth were made of Creusabro 8000 steel and a hardening process was then carried out on the front section of the bucket teeth components by using an induction furnace. The power used in the induction furnace varies from 28, 35, 42 and 49 kW (kilowatts) and the holding time varies between 3 and 5 minutes. The heat treatment process used oil as a cooling medium. The analysis was carried out to determine the area that experienced an increase in hardness and its occurred microstructure. Microstructure examination was carried out with an optical microscope, and hardness test by using a Vickers microscopy. It can be concluded from the result of the analysis that the large area experienced an hardness increase is directly proportional to the electric current magnitude and holding time. The microstructure has changed from fine pearlite to martensite thus hardness of Bucket Teeth can be increased up to 100% of the initial hardness.
Karakterisasi fisik dan kimiawi bentonite untuk membedakan natural sodium bentonite dengan sodium bentonite hasil aktivasi Cecep Ruskandi; Ari Siswanto; R Widodo
Jurnal POLIMESIN Vol 18, No 1 (2020): Februari
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v18i1.1596

Abstract

Bentonit adalah mineral yang cukup luas penggunaannya baik dalam bidang pertambangan maupun sebagai pengikat pasir cetak dalam bidang pengecoran logam. Secara alami bentonite ada dua jenis yaitu Na bentonite (swelling bentonite) dan Ca bentonite (non swelling bentonite). Melalui aktivasi menggunakan Na2CO3 terjadi pertukaran kation Ca oleh Na sehingga dihasilkan Na bentonite hasil aktivasi (activated Na bentonit). Penelitian ini dilakukan untuk menemukan karakteristik pembeda antara Na bentonite yang alami terhadap Na bentonite hasil aktivasi menggunakan berbagai metode karakterisasi yaitu XRD, SEM/EDS, pengujian indeks Swelling, titrasi, serta uji reaksi identifikasi. Na bentonite alami diberi kode sampel A, sedangkan Na bentonite hasil aktivasi diberi kode sampel AC. Hasil pengujian XRD menunjukkan bahwa pada bentonite alami tersusun atas senyawa montmorrilonit dan senyawa yang mengandung Al, Si dan O. Bentonite hasil aktivasi tersusun atas senyawa montmorrilonit dan kwarsa. Hasil pengujian SEM/EDS menunjukkan bahwa Na bentonite hasil aktivasi memiliki morfologi permukaan butiran yang lebih halus daripada bentonite alami. Na bentonite alami ternyata memiliki nilai indeks swelling lebih besar daripada Na bentonite hasil aktivasi. Indeks swelling Na bentonite alami berkisar antara 29 – 35 ml, sedangkan indeks swelling bentonite hasil aktivasi berkisar antara 15 – 22 ml. Hasil pengujian titrasi mengindikasikan bahwa pada Na bentonite hasil aktivasi mengandung anion CO32- lebih banyak berdasarkan volume asam HCl yang terpakai dalam titrasi yaitu 2-10 ml dibandingkan Na bentonite alami yaitu 0,5 – 1 ml. Reaksi identifikasi anion menunjukkan pada Na bentonite hasil aktivasi terjadi gelembung gas yang tidak ditemukan pada sampel Na bentonite alami.Kata kunci : Na bentonite, alami, aktivasi, morfologi, indeks swelling, gelembungPhysical and chemical characterization of bentonite to distinguish natural sodium bentonite from activated sodium bentoniteAbstrackBentonite is a mineral that widely used both in the mining sector and in the foundry industry as a molding sand binder. Naturally, there are two types of bentonite namely Na bentonite (swelling bentonite) and Ca bentonite (non swelling bentonite). Through activation using Na2CO3, Ca cation is exchanged by Na cation resulting in activated Na bentonite. The study was conducted to find the distinguishing characteristics between natural Na bentonite against activated Na bentonite using various characterization methods, namely XRD, SEM / EDS, Swelling index testing, titration, and identification reaction tests. Natural bentonite Na is designated  as sample A, while activated bentonite Na is designated as AC. XRD test results showed that the natural bentonite is composed of montmorrilonite compounds and other compounds containing Al, Si and O elements. while the activated bentonite is composed of montmorrilonite and quartz. SEM / EDS test results that activated Na bentonite has a finer surface morphology than that of natural bentonite. Natural Na bentonite appears to have a swelling index value greater than that value of activated Na bentonite. The swelling index of natural Na bentonite ranges from 29 to 35 ml while it is of  activated Na bentonite ranges from 15 to 22 ml. The result of titration test indicate that the activated Na bentonite contains more CO32- anions based on the volume of HCl acid used in the titration which is 2-10 ml compared to natural Na bentonite which is 0.5-1 ml. Anion identification reaction shows that gas bubbles appear in activated Na bentonite while it did not in natural Na bentonite sampel.
Pendekatan Hukum Stokes Pada Proses Terjadinya Slag Untuk Meningkatkan Efektifitas Pembersihan Cairan Logam Pada Proses Peleburan Besi Cor Muhammad Rizki Gorbyandi Nadi; Cecep Ruskandi; Ari Siswanto; Eko Koswara
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 12, No 2 (2022): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v12i2.57997

Abstract

Tujuan dari penelitian ini adalah untuk meningkatkan efektifitas pembersihan slag pada proses peleburan besi cor. Penelitian ini menghasilkan perhitungan kecepatan terminal slag muncul ke permukaan tanur induksi berdasarkan pendekatan Hukum Stokes pada masing-masing slag yang muncul saat proses peleburan besi cor. Setiap pengecoran besi cor diambil tiga buah sampel berdasarkan waktu tercepat pada slag yang sangat ringan, waktu terlambat yang dimiliki oleh slag terberat dan waktu ekstrem sebagai pembanding. Hasil dari setiap sampel dilakukan pengujian karakterisasi seperti bentuk, ukuran dan komposisi kimia pada setiap sampel yang kemudian disesuaikan dengan perhitungan yang telah dibuat. Karakterisasi dianalisa dengan menggunakan X-ray diffraction, Scanning micrsocope elektro dan energy dispersive spectroscopy micro analysis. Hasil menunjukkan bahwa pendekatan hukum stokes untuk memprediksi slag mencapai permukaan mendapatkan hasil yang sesuai bahwa seluruh slag mencapai permukaan pada waktu t = 230 s. Slag yang muncul pada waktu t = 300 s merupakan slag yang terbentuk akibat interaksi cairan dengan permukaan yang bukan merupakan slag yang terjadi dari raw material yang digunakan. Penelitian ini berhasil untuk meminimalisir terbentuknya slag pada setiap pengecoran besi cor menggunakan tanur induksi.
Analisis Pengaruh Arus Listrik Pada Proses Pengelasan TIG Terhadap Kekuatan Sambungan Las Material Logam Aluminium 6061 Ilham Khalilulah; Iwan Gunawan; Ari Siswanto
Jurnal Vokasi Mekanika (VoMek) Vol 6 No 4 (2024): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/vomek.v6i4.831

Abstract

The The selection of current in aluminum welding significantly affects weld joint quality. Excessively high current can lead to increased penetration, distortion, and overmelting. Conversely, low current may result in weak joints, insufficient penetration, and increased porosity risk. This study focuses on understanding the effect of current variations in the Tungsten Inert Gas (TIG) welding process on the strength of 6 mm thick aluminum 6061 welds using ER4043 filler. Tensile strength and flexibility are critical in construction, ensuring strong, stable, and durable welds to withstand static loads. The study found that a welding current of 160A achieved the highest tensile strength, averaging 207.49 MPa. In contrast, 100A yielded the lowest tensile strength at an average of 132.854 MPa, while 130A produced an intermediate average of 154.128 MPa. Bending test results showed that only the 160A weld met standard criteria, whereas welds with 100A and 130A currents exhibited cracks and fractures beyond acceptable limits. Microstructural analysis revealed that the Heat Affected Zone (HAZ) and weld metal at 160A were dominated by the Mg2Si phase, which significantly enhances the mechanical strength of the material. These findings highlight the importance of selecting the appropriate welding current for aluminum 6061. A current of 160A is recommended as the optimal choice to produce strong and reliable weld joints.
The Analisis Pengaruh Arus Listrik Pada Proses Pengelasan Tig Terhadap Kekuatan Sambungan Las Material Logam Aluminium 6061 Ilham Khalilullah; Iwan Gunawan; Ari Siswanto
JTRM (Jurnal Teknologi dan Rekayasa Manufaktur) Vol 7 No 2 (2025): Volume: 7 | Nomor: 2 | Oktober 2025
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat (P3M) Politeknik Manufaktur Bandung (Polman Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.48182/jtrm.v7i2.189

Abstract

The selection of current in aluminum welding has a significant impact on the quality of the weld joint. Too high a current can cause increased penetration, potential distortion and the risk of overmelting. On the other hand, too low a current can produce a weak weld joint, lack of penetration, and increase the risk of porosity formation. The main focus of this study is to understand the effect of current variations in the Tungsten Inert Gas (TIG) welding process on the strength of 6 mm thick aluminum 6061 welds and using ER4043 filler. The tensile strength and flexibility of the weld joint are very important in construction because they determine the strength, stability, and toughness of the joint to withstand static loads. This study shows that a welding current of 160 Ampere produces the highest tensile strength with an average value of 207.49 MPa, while a current of 100 Ampere has the lowest tensile strength with an average of 132.85 MPa. For a current of 130 Ampere, the average tensile strength was recorded at 154.128 MPa. The bending test results revealed that only welding with a current of 160 Ampere met the standard criteria, while currents of 100 Ampere and 130 Ampere experienced cracks and fractures that exceeded the standard limits. Microstructural analysis showed that in the heat affected zone (HAZ), the Mg2Si phase was most dominant at a current of 160 Ampere, which also applied to the weld metal. This Mg2Si phase contributed to the increase in the mechanical strength of the material. Based on these results, this study emphasizes the importance of choosing the right current in welding aluminum 6061, with a current of 160 Ampere as the best choice to produce strong weld joints.
Co-Authors Cecep Ruskandi Cecep Ruskandi Darma Firmansyah Undayat Eko Koswara Ilham Khalilulah Ilham Khalilullah Iwan Gunawan Nadi, Muhammad Rizki Gorbyandi Nadi R Widodo