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All Journal JURNAL CRANKSHAFT BULETIN FISIKA
I Nyoman Jujur
Center for Materials Tecnology, BPPT
Astronomy Control & Systems Engineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Physics

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Analisa Hasil Sambungan Las ( Pipa STKM 13B Dan Plat SPH 440) Dengan Pengujian Tarik dan Photomacro Fikri, Luqman; Simamora, Yulianto; Priyadi, Muhammad Untung Zaenal; Saleh, Yasya Khalif Perdana; Zaenudin, Mohammad; Mulyono, Sidik; Gamayel, Adhes; Triwiyanto, Askar; Jujur, I nyoman
JURNAL CRANKSHAFT Vol 7, No 2 (2024): Jurnal Crankshaft Vol.7 No.2 (2024)
Publisher : Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24176/cra.v7i2.12657

Abstract

ABSTRACTGMAW (Gas Metal Arc Welding) is a fast, versatile welding technique that can be used in various positions, but it often results porosity in welded joints.This research aims to analysis of the welded joints of STKM13B pipe and SPD 440 plate using tensile and micro testing, using welding a current of 18 and varying voltages of 110, 130, and 150. The results is the shape of the welded joint of the plate and pipe is perfectly connected, the tensile test results showed that the ultimate strength values for specimen 1, 2, 3 (A110/V18, A130/V18, A150/V18) were (18,959, 27,886, 40,005 N) respectively. The highest ultimate strength values were obtained from the specimens (A150/V18) while the lowest ultimate strength value was obtained from specimen (A110/V18). The use of welding current strongly correlates with ultimate strength value and photomacro results, with higher currents resulting in higher density levels, minimizing porosity, and increasing ultimate strength. Keywords: GMAW Welding, Tensile Test, Macro Optical Test. 
The Corrosive Properties Analysis of Biodegradable Magnesium Composites Mg-xCAp (x=0, 5%, 10%, and 15%) for Bone Implant Applications Bano, Ana; Rupiasih, Ni Nyoman; Setyadi, Iwan; Wibisono, Mirza; Suryadi, Suryadi; Jujur, I Nyoman
BULETIN FISIKA Vol. 27 No. 1 (2026): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2026.v27.i01.p08

Abstract

Magnesium (Mg) is a promising biodegradable material for bone implant applications due to its suitability of mechanical properties and biocompatibility with natural bone. However, its rapid degradation in physiological environments remains a major obstacle in clinical applications. The addition of carbonated apatite (CAp) as a bioactive reinforcing phase is expected to improve the corrosion resistance of Mg-based composites by forming a more stable surface layer. This study aims to evaluate the corrosion properties of Mg–xCAp composites with variations in CAp content of 0%, 5%, 10%, and 15%. Corrosion testing was carried out electrochemically in simulated body fluid (SBF) solutions using the Open Circuit Potential (OCP), Electrochemical Impedance Spectroscopy (EIS), and Tafel polarization methods. The OCP results showed a potential shift towards a more positive direction up to −1.87 V as the CAp fraction increased, indicating increased electrochemical stability. EIS analysis showed a progressive increase in charge transfer resistance (Rct), with the highest value of 309.8 Ω•cm² in the Mg–15CAp composite, indicating the formation of a more protective surface layer against aggressive ion penetration. Tafel polarization results confirmed a significant decrease in corrosion rate, with Mg–15CAp showing the lowest corrosion rate of 2.03 mm/year. Overall, the addition of CAp proved effective in controlling Mg degradation and improving the corrosion resistance of the composite, thus potentially expanding the application of Mg–CAp as a biodegradable bone implant material.
Co-Authors Adhes Gamayel Agus Hadi S. Wargadipura, Agus Agustanhakri Bakri, Agustanhakri Bano, Ana Fikri, Luqman Iwan Setyadi Joni Sah, Joni Muhammad Untung Zaenal Priyadi mulyono, Sidik Ni Nyoman Rupiasih Simamora, Yulianto Suryadi Suryadi Triwiyanto, Askar Wibisono, Mirza Yasya Khalif Perdana Saleh Zaenudin, Mohammad