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All Journal JURNAL DINAMIKA VOKASIONAL TEKNIK MESIN JURNAL CRANKSHAFT AMMA : Jurnal Pengabdian Masyarakat
Hariz Dedy Sayogi, Muhammad
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Humanities Chemistry Control & Systems Engineering Education Energy Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Nursing Social Sciences

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Pemanfaatan TIK Dalam Pembuatan Dokumen Pendukung Untuk Melamar Pekerjaan Pasca Kelulusan Siswa SMK Di Kab. Tanah Bumbu Surya Rahmany, Rijal; Christandi Batubara, Yongki; Made Ivan Wiyarta Cakra Sujana, I; Gunawan, Gad; Mungil Kurniawati, Diniar; Qalbi AM, Chaerul; Aldo, Jefri; Hariz Dedy Sayogi, Muhammad
AMMA : Jurnal Pengabdian Masyarakat Vol. 3 No. 11 : Desember (2024): AMMA : Jurnal Pengabdian Masyarakat
Publisher : CV. Multi Kreasi Media

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Abstract

Vocational high school (SMK) students represent a level of vocational secondary education expected to fulfill the demand for technical labor at specific levels within the industry. However, current SMK graduates face challenges due to intense competition in securing employment. This community service initiative aims to enhance the skills of SMK students by focusing on the utilization of Information and Communication Technology (ICT) in the preparation of post-graduation documents. A case study was conducted at a private vocational high school (SMKS) in and state vocational high school (SMKN) in Tanah Bumbu Regency as an effort to prepare students to face the challenges of Industry 4.0. Through outreach activities, this initiative introduced the concept of community service and the benefits of ICT in document preparation. The methods employed aimed to achieve outcomes such as improving students' skills, applying ICT in preparing supporting documents for job applications, and enhancing students' competitiveness in the labor market. The results of the activities carried out showed an increase in participants' knowledge of curriculum vitae and job application letters. Survey results also indicated that the seminar was highly beneficial for participants in this community service activity through technical outreach.
Pemodelan dan Analisa Respon Dinamis Impeller Pompa Sentrifugal Akibat Perbedaan Tekanan Hisap dan Tekanan Buang Dedy Sayogi, Muhammad Hariz; Apriandi, Riyki; Aldo, Jefri; Rahmany, Rijal Surya
JURNAL CRANKSHAFT Vol 8, No 1 (2025): Jurnal Crankshaft Vol.8 No.1 (2025)
Publisher : Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24176/cra.v8i1.14045

Abstract

Pada penelitian ini dilakukan simulasi karakteristik respon dinamis impeller pompa sentrifugal dengan tegangan input 250 V dengan perbedaan tekanan fluida pada suction inlet dan discharge outlet. Terdapat tiga parameter respon dinamis impeller yang diamati yaitu perpindahan, kecepatan sudut dan percepatan sudut. Respon dinamis perpindahan impeler dianalisis dengan mensimulasikan interval waktu dari 0 detik hingga 10 detik. kondisi pertama puncak kecepatan sudut sekitar 0,1 rad/s lebih rendah dibandingkan kondisi kedua (sekitar 0,3 rad/s). Tanda negatif hanya menunjukkan amplitudo gelombang. Antara 1,02 detik hingga 1,04 detik, puncak kecepatan sudut pada kondisi pertama adalah sekitar 0,1 rad/s, sementara pada kondisi kedua sekitar 0,2 rad/s, kondisi pertama dengan tekanan lebih rendah di inlet dan outlet membutuhkan kecepatan sudut lebih kecil (2,8 rad/s) dibandingkan kondisi kedua dengan tekanan lebih tinggi, yang memerlukan kecepatan sudut sedikit lebih tinggi (2,77 rad/s) pada waktu yang sama. Respons dinamis percepatan sudut impeler dianalisis pada kondisi awal dan keadaan stabil. Pada kondisi tunak, yang diambil antara 14,07 detik hingga 14,08 detik, kondisi pertama menunjukkan percepatan sudut lebih kecil (sekitar 100 rad/s²) dibandingkan dengan kondisi kedua, yang memerlukan percepatan sudut lebih tinggi (sekitar 240 rad/s²). Secara keseluruhan, kondisi dengan tekanan lebih tinggi di inlet dan outlet (kondisi kedua) memerlukan percepatan sudut yang lebih besar dibandingkan dengan kondisi pertama pada waktu yang sama.Kata kunci:  pompa sentrifugal, simulasi, analisis
ANALYZING THE EFFECTS OF WATER, AIR, AND SALTWATER COOLANTS ON THE TENSILE STRENGTH & HARDNESS OF AISI 1045 STEEL WELDED WITH METAL INERT GAS Hariz Dedy Sayogi, Muhammad; Aldo, Jefri; Agustina, Lia; Made Susanto, I
Jurnal Dinamika Vokasional Teknik Mesin Vol. 11 No. 1 (2026)
Publisher : Department of Mechanical Engineering Education

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Abstract

This study aims to analyze the effect of cooling media variations (air, water, and salt water) on the mechanical properties of AISI 1045 medium carbon steel welded using the Metal Inert Gas (MIG) method. The experimental method was used with steel specimens in the form of plates which were then tested for tensile strength in accordance with the ASTM E8 standard and tested for hardness. The results of the study show that cooling with air produces the highest tensile strength (35.59 Kgf/mm²) due to the formation of ductile pearlite and ferrite microstructures. Cooling with water produced moderate tensile strength (34.42 Kgf/mm²), while cooling with salt water produced the lowest tensile strength (22.34 Kgf/mm²) due to the formation of hard but brittle martensite. Conversely, the highest hardness value was obtained with saltwater cooling (386.20 HV in the HAZ), followed by water, and the lowest with air. In general, slow cooling increases ductility and tensile strength, while rapid cooling increases hardness but decreases ductility. These findings emphasize the importance of selecting the appropriate cooling medium according to application requirements, whether the emphasis is on tensile strength or material hardness.
Co-Authors ALDO, JEFRI Apriandi, Riyki Gad Gunawan Lia Agustina, Lia Made Susanto, I Mungil Kurniawati, Diniar Qalbi AM, Chaerul Rijal Surya Rahmany Sujana, I Made Ivan Wiyarta Cakra Yongki Christandi Batubara