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All Journal Semesta Teknika JMPM (Jurnal Material dan Proses Manufaktur)
Mudjijana, Mudjijana
Universitas Gadjah Mada
Engineering Mechanical Engineering

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Peningkatan Ketahanan Korosi Pada Material Biomedik Plat Penyambung Tulang SS 304 Dengan Gabungan Metode Shot peening dan Electroplating Ni-Cr Sunardi, Sunardi; Iswanto, Priyo Tri; Mudjijana, Mudjijana
Semesta Teknika Vol 18, No 2 (2015): NOVEMBER 2015
Publisher : Semesta Teknika

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Stainless steel (SS) 304 is widely used as biomedical materials because of its lower cost and its availability. However its corrosion resistance is lower than that of the SS 316L. The purpose of this study is to determine the influence of the combination surface treatment i.e. shot peening treatment and electroplating Ni-Cr on the corrosion resistance in simulated body fluid (SBF) of SS 304 material. The shot peening treatments were carried out using a variable period of 5, 15 and 30 minutes. Diameter steel balls of 0.6 mm with a hardness of 40-50 HRc, was applied. Pressure compressor was maintained in the range of 6 -7 kg / cm2 with nozzle diameter and the distance between nozzle and the specimen of 5 mm and 10 cm respectively. After shot peening process, the specimens were nickel-electroplated using a voltage of 2 V at current of 0.03 A with the distance between the electrode of 4 cm for 15 minutes. After nickel-electroplated process the specimens were chrome-electroplated using a voltage of 4.5 V at current 0.3 A with the distance between the electrode of 15 cm for 5 minutes. The specimen was then tested its corrosion rate in the test medium SBF using Galvanostat M 273 in the range of -20 mV s / d 20 mV. The corrosion test results show that SS 316L and SS 304 without treatment have corrosion rate respectively 1.212 X 10-3 mm / year and 4,003 x 10-3 mm / year. Which means that corrosion rate of SS 304 is 333% higher than SS 316L. The corrosion rate after treatment shot peening 5, 15 and 30 minutes followed by Ni-Cr electroplating is respectively 2.121 x 10-3 mm / year, 0.554 x 10-3 mm / year and 0 mm / year (not detected by the measurement instrument).
KARAKTERISASI SAMBUNGAN SMAW BAJA KARBON RENDAH MENGGUNAKAN 3 JENIS ELEKTRODA Iswanto, Priyo Tri; Mudjijana, Mudjijana; Himarosa, Rela Adi
JMPM : Jurnal Material Dan Proses Manufaktur Vol 1, No 2 (2017): DESEMBER 2017
Publisher : JMPM : Jurnal Material Dan Proses Manufaktur

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Shield Metal Arc Welding (SMAW) merupakan salah satu cara yang biasa digunakan untuk pengelasan baja karbon rendah. Kualitas sambungan las dapat dikarakterisasi dengan pengujian tarik, fatik, kekerasan Vickers, dan strukturmikro. Penelitian ini bertujuan mengkarakterisasi sambungan SMAW baja karbon rendah menggunakan 3 jenis elektroda.Penelitian ini menggunakan baja karbon rendah 0,113 %C berdiameter 19,05 mm, dilas menggunakan elektroda E7018, E7016, dan E 6013. Karakterisasi hasil lasan menggunakan  alat Universal Testing Machine, Vickers hardness test, rotary bending fatigue,  dan optical microscope.Hasil penelitian menunjukkan lasan menggunakan elektroda tipe E7018 menghasilkan kekuatan tarik maksimum, UTS : 453,73 MPa,  nilai kekerasan Vickers, HVN : 148,23 kg/mm2 , sedangkan hasil lasan menggunakan tipe E7016 dan E6013 berturut-turut UTS : 442,11 dan 406,27 MPa, HVN : 142,30 dan 119,63 kg/mm2. Kekuatan sambungan las lebih rendah dari material baja karbon rendah as received yaitu 489,47 MPa. Hasil pengujian fatik berturut-turut mempunyai nilai ketahanan fatik (Se) : 204,18; 198,95; 182,82, dan lebih rendah dari Se baja S10C yaitu 292,59 MPa. Pengamatan strukturmikro logam las untuk 3 tipe elektroda didominasi struktur ferit batas butir (GF) dan perlit.
Physical and mechanical properties of semi-automatic MIG welding of AA5083H116 materials Mudjijana, Mudjijana
JMPM : Jurnal Material dan Proses Manufaktur Vol 2, No 1 (2018): JUNI 2018
Publisher : JMPM : Jurnal Material dan Proses Manufaktur

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Metal inert gas (MIG) welding speed can be carried out manually for complicated components and can also be controlled using computer numerical control (CNC). The purpose of the research is to investigate the effect of CNC welding speed on physical and mechanical properties of AA5083H116. AA5083H116 base metal, ER5356 electrodes, welding speeds of 8, 10, 12 mm/s, current of 120 A, voltage of 19 V, filling speed of 27 mm/s, argon gas rate of 15 liter/minute were used. Distortions after welding were measured using dial indicators, thermal cycles was recorded using type-K thermocouple using National instruments NI USB-9162 apparatus connected to a CPU. The physical properties was analyzed using SEM and EDS for only the best mechanical properties, and the mechanical properties were evaluated using Vickers microhardness, and tensile and bending universal testing machine. The results show that at the welding speed of 8 mm/s automatic regulated was the best mechanical properties compare to previous study at the welding speed of 10 mm/s manually regulated. However, SEM images show that there were several micro cracks at its grain, and several magnesium precipitates can be noticed from the EDS analysis.
Co-Authors Himarosa, Rela Adi Priyo Tri Iswanto Sunardi, Sunardi