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Journal : MACHINERY: Jurnal Teknologi Terapan

 1 
PENINGKATAN KEKERASAN PISAU SADAP KARET PRODUK PANDAI BESI DENGAN PROSES HARDENING DAN QUENCHING ( VARIASI TEMPERATUR DAN MEDIA PENDINGIN ) Dioni Yoga Pratama; Firdaus .; Indra Gunawan
MACHINERY: Jurnal Teknologi Terapan Vol. 1 No. 1 (2020): Machinery:01012020
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (329.839 KB) | DOI: 10.5281/zenodo.4540931

Abstract

Often the rubber tapping knives produced by blacksmiths have cracks and chipped and even broken on their blades, so rubber farmers must often replace them with new knives. Thus the product cannot be used for a long time and has reduced economic value. The cause of this rubber tapping knives made by blacksmiths is easily damaged because the gilding method on the product is not done properly. So the product was produced have a relatively low level of hardness. This study aims to determine the effect of the hardening and quenching process on the hardness of rubber tapping knives made by blacksmiths. Data of test were analyzed using ANOVA with full factorial level design , main effect model design, and 3 replications assisted with Design-Expert software. At a temperature of 800℃, the maximum hardness value of 62,8 HRC obtained from the quenching results using a water cooling media, while the minimum hardness value of 62,2 HRC was obtained from oil cooling media.  At a temperature of 850℃ the maximum hardness value of 60,4 HRC obtained from the quenching results using water cooling media, and the minimum hardness value obtained from the oil cooling media is 59,1 HRC.Keywords: Spring leaf, Hardening , Quenching ; ANOVA; Full Factorial;Rubber tapping knives
ANALISA KEKUATAN TARIK PADA SAMBUNGAN LAS BUTT JOINT BAJA ST 37 METODE PENGELASAN SMAW DAN GTAW andreas parlindungan sihombing; Mochammad Yunus; Indra Gunawan
MACHINERY: Jurnal Teknologi Terapan Vol. 3 No. 1 (2022): Machinery:03012022
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (193.306 KB) | DOI: 10.5281/zenodo.6413303

Abstract

Pengelasan tidak hanya menghangatkan sampai kedua bagian benda menjadi lunak dan mengeras kembali, tetapi juga memberikan zat tambahan atau anoda selama pemanasan untuk membuat las tetap utuh dan mencapai kekuatan yang ideal. Pengelasan dapat dibagi menjadi dua klasifikasi, yang pertama adalah pengelasan impermeabel dan pengelasan fusible. Pengelasan kombinasi menggunakan panas untuk melarutkan bagian-bagian yang akan disambung. Kekuatan sambungan las dipengaruhi oleh beberapa elemen, yaitu sistem pengelasan, material, katoda, dan jenis las yang digunakan. Bagaimana elastisitas jaringan baja ST 37 dengan proses pengelasan SMAW (Protected Metal Bend Welding) dan TIG (Gas Tungsten Circular segment Welding). Motivasi di balik tinjauan ini adalah untuk memutuskan elastisitas tes yang dilas dengan strategi yang berbeda, mendapatkan kekuatan dari sistem pengelasan, menguji hasil las solidaritasnya, dan pemeriksaan kualitas las SMAW dan GTAW. Jenis yang digunakan adalah sambungan pantat dengan klip V tunggal, dan bentuk dan ukuran contoh adalah sesuai ASTM E8/E 8M-09. Hasil penelitian menunjukkan bahwa penggunaan jenis pengelasan mempengaruhi tekanan. kekuatan. Kekakuan terbesar dari pengelasan SMAW adalah 646,04 N/mm2 dan elastisitas dasar adalah 173,52 N/mm2. Pengelasan TIG memiliki kekakuan terbesar 191,03N/mm2 dan elastisitas dasar 157,06N/mm2.
Pengaruh Media Pendingin Oli Bekas Pada Proses Quenching Terhadap Kekerasan Linggis Brongsong Gandi Hanggara; Fenoria Putri; Indra Gunawan
MACHINERY: Jurnal Teknologi Terapan Vol. 3 No. 3 (2022): Machinery:03032022
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.7246725

Abstract

The purpose of this study was to determine the effect of the quenching process that uses used oil as a cooling medium with temperature variations of 750oC, 850oC, and 900oC with a holding time of 30 and 40 minutes to the hardness of the eye of the brongsong crowbar which is often subjected to dullness. The main material used by the people of Sukadana village in making this brongsong crowbar is pipa carbon steel ASTM A106 grade B. This pipe belongs to medium carbon steel because it has a carbon element of 0.30%. After the heat treatment process of the brongsong crowbar specimen, hardness testing was carried out using a rockwell hardness test tool. The results of the hardness test were analyzed using ANOVA calculations. From the results of this study, it was found that the brongsong crowbar specimen experienced an increase in hardness, with the highest hardness value of 52.6 HRC obtained from the quenching process using used oil as a cooling medium and with a holding time of 40 minutes at a temperature of 850oC, while the lowest hardness value is obtained from the results of the quenching process using used oil cooling media with a holding time of 30 minutes at a temperature of 750oC of 38.8 HRC. So that it can be known that the highest hardness value is obtained from the results of the quenching process using used oil cooling media with a holding time of 40 minutes at a temperature of 850oC.
Co-Authors Ahmad Junaidi Amin Rejo andreas parlindungan sihombing Dany Agung Rizky Dioni Yoga Pratama Eka Satria Martomi Fatahul Arifin Fathur Raihan Perdana Fenoria Putri Firdaus Firdaus . Gandi Hanggara Harry Mushafiqih Hasbi Hasbi Mochammad Yunus Soegeng Witjahjo Syamsul Rizal Taufikurrahman Taufikurrahman Wirda Novarika Yahya