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All Journal JURNAL DINAMIKA VOKASIONAL TEKNIK MESIN Journal of Engineering and Applied Technology Proceeding of International Conference on Science, Education, and Technology
Basyirun Basyirun
Universitas Negeri Semarang
Automotive Engineering Civil Engineering, Building, Construction & Architecture Education Electrical & Electronics Engineering Engineering Mechanical Engineering Social Sciences

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Pengaruh Variasi Temperatur Preheat Pada Pengelasan Smaw Terhadap Struktur Mikro Dan Kekerasan Baja Karbon SS400 Savitri Ramadhani; Basyirun Basyirun; Rusiyanto Rusiyanto; Sunyoto Sunyoto
Jurnal Dinamika Vokasional Teknik Mesin Vol. 7 No. 1 (2022)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v7i1.46929

Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh pengelasan SMAW tanpa preheat dan dengan variasi temperatur preheat sebesar 80°C, 110°C, 140°C, dan 170°C terhadap struktur mikro dan nilai kekerasan baja SS400. Metode penelitian menggunakan metode eksperimental design. Variasi dalam penelitian ini adalah variasi temperatur preheat sebesar 80°C, 110°C, 140°C, dan 170°C. Parameter lain seperti jenis kawat las, arus pengelasan, dan jarak waktu dari preheat ke pengelasan dibuat seragam disetiap variasi temperatur. Variasi temperatur preheat memiliki pengaruh yang berbeda terhadap struktur mikro dan nilai kekerasan Vickers baja SS400. Berdasarkan penelitian yang telah dilaksanakan dapat disimpulkan bahwa terdapat pengaruh variasi temperatur preheat pada proses pengelasan SMAW terhadap struktur mikro dan nilai kekerasan Vickers yang dihasilkan. Spesimen pada variasi temperatur 140°C hingga 170°C tidak terdapat struktur martensite. Sedangkan spesimen raw material, 80°C, 110°C terdapat martensite di antara ferrite dan pearlite. Semakin tinggi temperatur preheat, semakin sedikit jumlah martensite. Hasil nilai kekerasan sejalan dengan struktur mikro yang terbentuk, terdapat pengaruh pengelasan non preheat dan variasi temperatur preheat pada proses pengelasan SMAW baja SS400 terhadap nilai kekerasan Vickers. Pengaruh variasi temperatur preheat terhadap nilai kekerasan baja SS400 adalah terjadi penurunan terhadap kekerasan secara signifikan di semua daerah pengelasan. Sedangkan spesimen preheat terendah memiliki kekerasan tertinggi di daerah weld metal dan spesimen preheat tertinggi memiliki kekerasan terendah sebesar di daerah base metal. Rata-rata nilai kekerasan tertinggi di daerah weld metal dan terendah di daerah base metal.
Analysis of tensile strength and microstructure on GTAW- Aluminum 6061 welding results Ardani Ahsanul Fakhri; Basyirun Basyirun; Ahmad Fikrie; Prihatno Kusdiyarto
Journal of Engineering and Applied Technology Vol 3, No 2 (2022): (August)
Publisher : Faculty of Engineering, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jeatech.v3i2.53149

Abstract

The process of joining aluminum metal requires a special welding method. The use of GTAW welding is a suitable method for joining aluminum plates. This research is intended to analyze the tensile strength and microstructure of the GTAW Aluminum 6061 welding with various currents. The research method used in this research is experimental research. Welding current variations used in this study were 100A, 115A, and 130A, then tested using a destructive test, tensile test. The data analysis used in this study is descriptive analysis, where the data obtained are averaged and then described and concluded. The results of microstructure research on GTAW welding show that changes in the microstructure are very visible in the HAZ area and the weld metal, the greater the heat input, the more spread the Mg2Si grains will be. Good structural dispersion only occurs at 130A current. This is different from the base metal which does not change the material structure at all. Based on the tensile test, the tensile stress value is 80.9 MPa at 100 A current, 84.9 MPa at 115A current variation, and the highest tensile strength is 86.7 MPa at 130A current. So, it can be concluded that the higher the current used, the better the microstructure and tensile strength produced.
PROTOTYPE OF TRADITIONAL MINED CRUDE OIL DISTILLATION TECHNOLOGY Islakhul Umah Arif; Basyirun Basyirun
Jurnal Dinamika Vokasional Teknik Mesin Vol. 8 No. 1 (2023)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v8i1.53611

Abstract

Crude oil or petroleum is a complex hydrocarbon compound consisting of carbon, hydrogen, and a small number of other elements such as oxygen, nitrogen, sulfur, and several metals including Fe, Na, Va, all of which are impurities. In Wonocolo there is a traditional oil mining relic from the Dutch era carried out by local residents. Oil from traditional mining is processed by residents into diesel fuel by simple distillation. Petroleum distillery equipment which is still simple has several drawbacks, namely the process is carried out openly, condenser heat transfer is not optimal along with the distillation process, and causes air pollution in the surrounding environment. This study aims to design a laboratory-scale distillation prototype that has the characteristics of setting the cooling water discharge in the condenser, the effect of time on the distillation capacity, and setting the boiler temperature on the prototype. The results of the prototype design for crude oil distillery have the following specifications; the capacity of the petroleum distillery process is 5000 ml in the boiler, the boiler material uses stainless steel 201. The condenser uses a shell and tube type with counter flow flow direction, with a number of tubes 12 with a diameter of 19 mm and a length of 500 mm.The prototype characteristics in the 3-7 discharge test have the highest heat transfer value at 7 liters/minute discharge, which is 210.8 W and the lowest is 50.19 W at 3 liters/minute discharge. Characteristics of distillation time at 174.48 minutes can produce 3486.67 ml of diesel oil with a kitchen temperature of 350 oC. The characteristics of the kitchen temperature control from 310 oC, 330 oC, 350 oC, 370 oC, and 390 oC, the highest diesel oil was 4350 ml at 390 oC and the lowest was 1670 ml at 310 oC.
Development of Job Instruction on Student Readiness in Carrying out Internship in the Automotive Engineering Skill Competency Dewi Pujining Nugraheni; Basyirun Basyirun; Eko Supraptono
International Conference on Science, Education, and Technology Vol. 8 (2022)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Abstrak. One of the Ministry of Education and Culture strategies to realize quality and industry-recognized vocational education and training for the Industrial Revolution 4.0 is to provide opportunities for students to carry out industrial work practices or project work with business and industrial world (DU/DI). In practice, vocational students in automotive engineering skill competency tend to be unprepared which results in ineffective internships. This development research aims to formulate the need for job instruction which is oriented toward the readiness of students to carry out an internship program in which there are basic components of instruction and preparation, understanding, testing and participation stages, and follow-up. The readiness of students includes knowledge, skills, and attitudes. Research development uses the ADDIE development model procedure, namely (1) Analysis, (2) Design (3) Development, (4) Implementation, (5) Evaluation. This study aims to: 1) Develop job instruction, 2) Know the feasibility of job instruction, 3) Know the effectiveness of job instructions; 4) Know the increase in student readiness before carrying out internships. The feasibility test obtained a score of 3.63% with a very feasible category. Practicality of 92% with a very practical category. The job instruction that was developed was also tested for its effectiveness with an N-Gain value of 78% which means it is effective and the result is a student readiness level of 84.47% in the ready category. The results of this development research show that job instruction has a positive effect on student readiness and can be used at the stage of industrial work practice debriefing of Automotive Engineering Skill Competency.
Co-Authors Ahmad Fikrie Ardani Ahsanul Fakhri Dewi Pujining Nugraheni Eko Supraptono Islakhul Umah Arif Prihatno Kusdiyarto Rusiyanto Rusiyanto, Rusiyanto Savitri Ramadhani Sunyoto Sunyoto