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Study of the Effect of Welding Current Variations on Joint Strength and Microstructure of Cracker Lontongan Chopper Machine Rusdi, Firman Maulana; Istiqlaliyah, Hesti
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol 17, No 2 (2023): SINTEK JURNAL
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.17.2.120-129

Welded joints in machine frame construction are prone to failure due to changes in material properties caused by the influence of heat, as well as the possibility of defects in welded joints. This is especially crucial in constructions subjected to dynamic loads, where the weld joint is a determining factor in the toughness of the material. This study aims to evaluate the microstructure, hardness, and tensile strength by applying variations in welding current in the Shielded Metal Arc Welding (SMAW) process. The research method included an experimental approach and literature study with careful observation. The findings of this study include: 1) The welding current strength significantly affected the microstructure arrangement of each tested specimen. 2) An increase in welding current resulted in an increase in the number and density of perlite structures in the Heat-Affected Zone (HAZ). In addition, an increase in welding current also resulted in an increase in hardness and tensile strength values. The average tensile strength successively increased from 90 A, 100 A, to 110 A, namely 320.11 MPa; 345.33 Mpa; 368.6 Mpa. 3) The results of statistical tests using the F-test on the tensile and hardness tests showed values of 0.023 and 0.040, respectively, indicating a significant difference in the hardness testing process with the application of current strengths of 90 A, 100 A, and 110 A. This research contributes to an in-depth understanding of the effect of welding current strength on the mechanical properties of materials, with important implications for improving the reliability of welded joints in machine construction.

STUDI IDENTIFIKASI PASANGAN COMMERCIALLY PURE TITANIUM DAN UHMWPE UNTUK APLIKASI MATERIAL IMPLAN LUTUT Rusdi, Firman Maulana; Cahyani , Arini Dwi
Jurnal Rekayasa Mesin Vol. 15 No. 3 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i3.1820

Orthopedics is a science that studies the human body skeleton. This field of science helps patients who experience joint and skeletal problems. One of the problems faced is the need for body frame components to be replaced, for example the knees. This replacement requires a man-made component, namely an implant. Implants can be made from metal, polymer, and ceramic. The biomaterial implant identification process includes X-Ray Diffraction analysis, hardness and tensile testing. XRD testing of CP–Titanium and UHMWPE using the Rigaku XRD tool. CP–Titanium hardness testing uses Vickers micro hardness, while for UHMWPE uses Shore D. CP–Titanium tensile testing uses a universal test machine with JIS Z2201 standards. Another material, namely UHMWPE, is tested using the same equipment as the ASTM D638 standard. The XRD test results for CP - Titanium show peaks of 35.3˚, 38.6˚, 40.2˚, namely the hexagonal structure of the compound element α - Ti. Meanwhile, UHMWPE material shows peaks (110) at 21.66˚ and (200) at 24.16˚. The peak data is an orthorhombic crystal structure, which is characteristic of polyethylene. The CP – Titanium hardness test results show an average hardness of 360.47 VHN. The hardness value of UHMWPE shows an average hardness of 48.5 Shore D. CP - Titanium tensile testing shows a maximum stress value of 534.4 MPa and a maximum strain value of 0.022. The UHMWPE tensile test showed an average maximum stress value of 23.87 MPa and an average maximum strain value of 1.36. The data above shows that the materials tested are CP - Titanium and UHMWPE. Hardness data indicates that these CP – Titanium and polyethylene materials are too soft for applications requiring wear resistance.

Peran Ekonomi Pendidikan dalam Meningkatkan Kesejahteraan Melalui Pendidikan dan Pelatihan Digital: Tinjauan Literatur Rusdi, Firman Maulana; Cahyani, Arini Dwi
Afeksi: Jurnal Penelitian dan Evaluasi Pendidikan Vol 6, No 2 (2025)
Publisher : Pusat Studi Penelitian dan Evaluasi Pembelajaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59698/afeksi.v6i2.451

Penelitian ini bertujuan untuk menganalisis peran pendidikan dan pelatihan berbasis digital dalam pendidikan nonformal sebagai alat peningkatan kesejahteraan masyarakat dari perspektif ekonomi pendidikan. Dengan menggunakan metode tinjauan literatur, penelitian ini mengkaji berbagai sumber akademik terkait dampak ekonomi pendidikan digital, tantangan implementasi, dan peluang pengembangan keterampilan tenaga kerja. Temuan ini menunjukkan bahwa pendidikan nonformal digital memberikan kesempatan belajar yang fleksibel, meningkatkan keterampilan tenaga kerja, dan berkontribusi pada pertumbuhan ekonomi dengan meningkatkan akses ke lapangan kerja yang lebih baik. Namun, tantangan signifikan tetap ada, termasuk kesenjangan dalam akses ke teknologi, rendahnya pengakuan sertifikasi non-formal, dan ketidakselarasan antara kurikulum pelatihan dan kebutuhan industri. Untuk mengatasi tantangan ini, studi ini merekomendasikan kebijakan yang mendukung pengakuan sertifikasi non-formal, meningkatkan kurikulum yang selaras dengan industri, dan mempromosikan akses yang adil ke teknologi bagi masyarakat yang kurang terlayani. Kolaborasi antara pemerintah, sektor swasta, dan lembaga pendidikan sangat penting untuk memastikan bahwa pendidikan nonformal digital memberikan manfaat yang optimal. Dengan strategi yang tepat, pendidikan nonformal berbasis digital dapat menjadi solusi yang efektif untuk tantangan ketenagakerjaan di era digital dan berkontribusi pada kesejahteraan masyarakat secara keseluruhan.

Entrepreneurship-Based Management Program as An Effort to Improve The Quality of Non-Formal Educational Institutions Cahyani, Arini Dwi; Suminar, Tri; Arbarini, Mintarsih; Rusdi, Firman Maulana
Afeksi: Jurnal Penelitian dan Evaluasi Pendidikan Vol 6, No 2 (2025)
Publisher : Pusat Studi Penelitian dan Evaluasi Pembelajaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59698/afeksi.v6i2.461

The management of the Community Learning Activity Center (CLC) institution is low, making some people less enthusiastic about participating in the program’s implementation. CLC is an institution, a forum, and a place to serve the community’s learning needs. Entrepreneurship encourages people to be enthusiastic about learning. The purpose of this study is to examine and describe entrepreneurship-based program management as an improvement in the quality of non-formal educational institutions.. This study uses a qualitative approach with a survey: data collection techniques, in-depth interviews, participatory observation, and documentation. The research subjects are administrators, tutors, and learning residents. They use qualitative analysis techniques with data reduction steps, data display, data verification to conclude. The results showed that the development of the CLC program followed the following steps: identification of learning needs, determining learning priorities, involving community leaders in planning program planning, considering local potential and local wisdom; and empowerment programs based on entrepreneurship, compiling programs to produce superior products as program sustainability, managers work professionally to make CLC independent in each program, and open networks with business partners for select marketing products.

STUDI IDENTIFIKASI PASANGAN COMMERCIALLY PURE TITANIUM DAN UHMWPE UNTUK APLIKASI MATERIAL IMPLAN LUTUT Rusdi, Firman Maulana; Cahyani , Arini Dwi
Jurnal Rekayasa Mesin Vol. 15 No. 3 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i3.1820

Orthopedics is a science that studies the human body skeleton. This field of science helps patients who experience joint and skeletal problems. One of the problems faced is the need for body frame components to be replaced, for example the knees. This replacement requires a man-made component, namely an implant. Implants can be made from metal, polymer, and ceramic. The biomaterial implant identification process includes X-Ray Diffraction analysis, hardness and tensile testing. XRD testing of CP–Titanium and UHMWPE using the Rigaku XRD tool. CP–Titanium hardness testing uses Vickers micro hardness, while for UHMWPE uses Shore D. CP–Titanium tensile testing uses a universal test machine with JIS Z2201 standards. Another material, namely UHMWPE, is tested using the same equipment as the ASTM D638 standard. The XRD test results for CP - Titanium show peaks of 35.3˚, 38.6˚, 40.2˚, namely the hexagonal structure of the compound element α - Ti. Meanwhile, UHMWPE material shows peaks (110) at 21.66˚ and (200) at 24.16˚. The peak data is an orthorhombic crystal structure, which is characteristic of polyethylene. The CP – Titanium hardness test results show an average hardness of 360.47 VHN. The hardness value of UHMWPE shows an average hardness of 48.5 Shore D. CP - Titanium tensile testing shows a maximum stress value of 534.4 MPa and a maximum strain value of 0.022. The UHMWPE tensile test showed an average maximum stress value of 23.87 MPa and an average maximum strain value of 1.36. The data above shows that the materials tested are CP - Titanium and UHMWPE. Hardness data indicates that these CP – Titanium and polyethylene materials are too soft for applications requiring wear resistance.

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