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All Journal Jurnal Engine: Energi, Manufaktur, dan Material Journal of Welding Technology Reswara: Jurnal Pengabdian Kepada Masyarakat Journal of Engineering and Applied Technology Jurnal Cakrawala Maritim
Wiwik Dwi Pratiwi
Politeknik Perkapalan Negeri Surabaya
Religion Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Social Sciences

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Comparative analysis of hardness and microstructure of dissimilar welded materials at various welding positions in the fabrication industry Mochammad Karim Al Amin; Ilham Nurcholis; Wiwik Dwi Pratiwi; Dika Anggara; Eriek Wahyu R W
Journal of Welding Technology Vol 4, No 1 (2022): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v4i1.2967

Abstract

304 stainless steel is commonly used in industry due to the advantages of great conductivity, while SS 400 carbon steel is largely used in the various engineering field on purpose of industrial and fabrication. One of examples is penstock application in Tegal, Central Java, has been using more than one kind of dissimilar steel, SUS 304 and SS 400, and the various of welding position (1G, 2G, and 3G). Penstock was flowed water from the river for irrigation and raw water so that could be affected to decrease of the thickness of materials. This research was conducted on the dissimilar welding of SUS 304 and SS 400 by SMAW with the welding process of (1G), (2G), and (3). After the welding process, visual examination, hardness test, and microstructure were conducted to examine the quality of welded and hardness of the root and surface of weld. The visual test was shown that no defect, the highest of hardness was at the weld metal with 3G of welding position at 207.17 HVN (specimen 2B) while the lowest of hardness was 195.13 HVN with 2G position (specimen 2A). The microstructure of weld metal was austenite of white and delta-ferrite of black, delta-ferrite was vermicular.
Overlay welding analysis on GTAW and SMAW processes in terms of mechanical properties and corrosion rate Ahmad Fikrie; Wiwik Dwi Pratiwi; Ardani Ahsanul Fakhri
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.v3i2.53148

Abstract

The Overlay welding process is a coating technique that is carried out using the welding process. In this study, a coating was conducted on carbon SA 516 gr. 70 with stainless steel electrodes. Welding was carried out with the GTAW and SMAW processes. The electrode used in the first coating for GTAW was ER309L while for SMAW was E309L. The next coating used in the GTAW electrode was ER316L and the SMAW electrode was E316L. In both welding processes, testing was carried out on mechanical properties and corrosion rates. Testing was carried out to determine mechanical properties, namely bending testing. This was done based on ASME IX. Bending test results in both processes are declared accepted because there are no defects. In testing the corrosion rate using the three-electrode cell method based on the ASTM G102 Overlay welding process with GTAW has a slower corrosion rate of 0.00890 MMPY compared to the overlay welding process with SMAW.
Efek Sinergis Alumina Trihydrate Dan Melamine Cyanurate Terhadap Ketahanan Api Glass Fiber Reinforced Polymer (GFRP) Ridha Inayah; Wiwik Dwi Pratiwi; Rizal Indrawan
Jurnal Engine: Energi, Manufaktur, dan Material Vol 7, No 1 (2023)
Publisher : Proklamasi 45 University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30588/jeemm.v7i1.1463

Abstract

Glass Fiber Reinforced Polymer (GFRP) in train interior components must have good fire resistance properties. Therefore, it is necessary to add a flame retardant compound to the GFRP material. In this study, Alumina Trihydrate (ATH) and Melamine Cyanurate (MCA) were mixed into a vinyl ester resin. The method of making GFRP refractory specimens uses the hand lay-up method. GFRP is mixed and tested for fire resistance standard ORE B 106.2. The results obtained after the addition of 25% ATH, a mixture of 25% ATH with 5% MCA, 10% MCA with 25% ATH, and 15% MCA with 25% ATH, 25% ATH in the outer layer, and a mixture of 5% MCA with 25% ATH in the outer layer of the resin weight is able to increase fire resistance. Optimum GFRP fire resistance at the addition of 25% ATH to the weight of the resin in the outer layer. The result of the burned area is 84.84 cm² with a fire extinguishing time of 0.33 seconds after the fire source leaves the specimen. The results show that the mixture of ATH and MCA has a synergistic effect on fire resistance properties, so it becomes a recommendation for interior sidewall panels and ceiling panels on trains according to the ORE B 106.2 standard
PENYULUHAN METODE MUDAH DAN PRAKTIS KARAKTERISASI FLY ASH SEBAGAI BAHAN SUBSTITUSI SEMEN Wiwik Dwi Pratiwi; Mochamad Yusuf Santoso; Endang Pudji Purwanti; Adhi Setiawan
RESWARA: Jurnal Pengabdian Kepada Masyarakat Vol 5, No 1 (2024)
Publisher : Universitas Dharmawangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46576/rjpkm.v5i1.3681

Abstract

Fly ash yang merupakan residu pembakaran batu bara memiliki potensi untuk digunakan sebagai supplementary cementitious material (SCM), yaitu material yang fungsinya mengganti sebagian semen. Jika divaluasi, harga fly ash berkisar antara Rp 130.000 sampai Rp 140.000 per ton. Namun, fly ash perlu dikarakterisasi terlebih dahulu untuk memastikan potensi tersebut. Permasalahan yang melatarbelakangi pengabdian kepada masyarakat ini adalah banyaknya fly ash yang dihasilkan oleh mitra dan belum dimanfaatkan dengan baik. Selain itu, untuk karakterisasi fly ash diperlukan pengujian di laboraturium tertentu. Sehingga, pada kegiatan ini dilakukan penyuluhan metode mudah dan praktis karakterisasi fly ash sebagai bahan substitusi semen. Berdasarkan identifikasi permasalahan mitra, didapatkan informasi bahwa limbah fly ash yang dihasilkan sebanyak 6-ton per hari dan langsung diangkut oleh pengolah sampah. Melihat potensi tersebut, kegiatan dilanjutkan dengan menguji sampel fly ash dari mitra. Hasil pengujian menunjukkan bahwa karakterisktik water requirement dari sampel melebihi batas maksimum dari persyaratan dari ASTM C618-19, sehingga masih perlu peningkatan kualitas dari fly ash jika akan digunakan sebagai bahan pembuatan beton. Hal ini dikarenakan semakin tinggi water requirement nya, maka kekuatan beton akan semakin rendah. Hasil ini kemudian dijadikan sebagai bahan paparan dalam kegiatan penyuluhan bebentuk grup diskusi dengan mitra. Selain hasil pengujiaan sampel, rekomendasi terkait perbaikan karakteristik fly ash juga dipaparkan ketika penyuluhan. Rekomendasi yang diberikan berupa beberapa alternatif teknik untuk optimalisasi pembakaran batu bara dan mendapat respon positif dengan tindak lanjut berupa koordinasi internal dalam rangka perencanaan strategi pemanfaatan fly ash
PENGOLAHAN LIMBAH BUAH SIWALAN MENJADI KERAJINAN POT DI DUSUN SHOBEROH, DESA DALEGAN, KECAMATAN PANCENG, GRESIK Wiwik Dwi Pratiwi; Endang Pudji Purwanti; Raffie Alfriesgasjah; Aygasta Firstya Alliyrahmanda; Reza Permana Mustofa; Raehanah Adelia
Jurnal Cakrawala Maritim Vol 6 No 2 (2023): Jurnal Cakrawala Maritim
Publisher : Pusat Penelitian dan Pengabdian Masyarakat (P3M) - PPNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33863/cakrawalamaritim.v6i2.2571

Abstract

Siwalan fruit waste is waste from the Siwalan fruit that has entered senescence and is no longer suitable for consumption. One of the problems with this waste is that only some people process it to make valuable goods. Siwalan waste includes agricultural waste that will cause global warming if not processed. Global warming can cause an increase in temperature. Siwalan fruit waste can be used to make crafts in the form of plant pots, which benefit the plant soil. Plant pot crafts were made in stages by local community PKK women, from assembling the pot frame to finishing. The implementation of this community service used an outreach and training scheme. Then, after the community has received socialization and training, a post-test is given to see the understanding gained. The local community felt the benefits obtained after receiving outreach and training regarding the importance of processing agricultural waste.
Co-Authors Adhi Setiawan Ahmad Fikrie Ardani Ahsanul Fakhri Aygasta Firstya Alliyrahmanda Dika Anggara Endang Pudji Purwanti Endang Pudji Purwanti Eriek Wahyu R W Ilham Nurcholis Mochamad Yusuf Santoso Mochammad Karim Al Amin Raehanah Adelia Raffie Alfriesgasjah Reza Permana Mustofa Ridha Inayah Rizal Indrawan