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All Journal JURNAL PENDIDIKAN TAMBUSAI JPIn : Jurnal Pendidik Indonesia International Journal of Engineering, Science and Information Technology Journal La Edusci International Journal of Research in Vocational Studies (IJRVOCAS) Sinergi Polmed : Jurnal Ilmiah Teknik Mesin Indonesian Research Journal on Education INTAN CENDEKIA: JURNAL PENGABDIAN MASYARAKAT
Tarigan, Efrata
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Pengabdian Penerapan Teknologi Tepat Guna Kepada Masyarakat (PPTTG) Mesin pengepres baglog jamur Bagi untuk Pemberdayaan usaha jamur di Desa Lau Bakeri Kecamatan Kutalimbaru Kabupaten Deli Serdang Sumatera Utara Tarigan, Efrata; Siahaan, Sihar; Hutabarat, Udur 1 Januari; Simanjuntak, Benrad
Jurnal Pendidik Indonesia (JPIn) Vol 5, No 2: Oktober 2022
Publisher : Yayasan Pendidikan Intan Cendekia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47165/jpin.v5i2.363

Abstract

Desa Lau Bakeri merupakan salah satu desa di Kecamatan Kutalimbaru, Kabupaten Deli Serdang dimana 30 KK diantaranya menjalankan usaha budi daya jamur tiram yang sesuai dengan kelembaban di daerah tersebut. Mitra pengabdian sudah 10 tahun menjalankan usaha budidaya jamur tiram yang sebagian besar masih dilakukan secara manual, termasuk pemadatan media tanam (baglog) yang memakan waktu cukup lama dan butuh pekerja upahan dengan gaji Rp. 200.000,- per hari. Permintaan jamur masih cukup terbuka akan tetapi karena keterbatasan lahan dan tenaga kerja belum semua dapat dilayani. Pembuatan mesin pengepres baglog dan pelatihan penggunaan mesin diharapkan dapat menjadi solusi yang dapat mengatasi permasalahan pada pembudidaya jamur tiram. Pada saat pemberian alat dan sosialisasi penggunaan mesin pengepres baglog jamur ini, masyarakat sangat menyambut baik, dan berharap kemitraan pegabdian masyarakat seperti ini terus berlanjut.
Implementing an Inquiry-Based Learning Model to Deepen Students’ Conceptual Understanding Hanum, Fida; Sebayang, Alexander; Ariyon, Muhammad; Tarigan, Efrata; Herawati, Ira
Journal La Edusci Vol. 6 No. 5 (2025): Journal La Edusci
Publisher : Newinera Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37899/journallaedusci.v6i5.2645

Abstract

This study examines the effectiveness of the Inquiry-Based Learning model in enhancing students’ conceptual understanding of the SMAW and GMAW welding processes, an area that remains underexplored in vocational education. The research addresses the gap between the development of procedural skills and the acquisition of conceptual reasoning by investigating whether inquiry-oriented instruction can promote deeper cognitive engagement. A quasi-experimental design was implemented involving two intact groups, with the control group receiving conventional teacher-centered instruction and the experimental group experiencing structured IBL activities. Data were collected through pretests, posttests, observations, and semi-structured interviews, and analyzed using paired-sample and independent-sample t-tests, ANCOVA, effect size calculations, and normalized gain measures. The findings reveal that the experimental group demonstrated a substantial and statistically significant improvement in conceptual understanding compared with the modest gains observed in the control group. The intervention produced a very large effect size and a medium-high normalized gain, indicating strong learning effectiveness. Students exposed to IBL were better able to analyze parameter interactions, interpret defect mechanisms, and connect theoretical principles with laboratory outcomes. Overall, the study provides strong empirical evidence that Inquiry-Based Learning is a highly effective pedagogical approach for strengthening conceptual mastery in welding technology and should be considered for broader integration into vocational curricula.
Evaluation of Weld Joint Quality in Drill Pipe Based on Heat Input Variation in Bending and Microstructure Test Sebayang, Alexander; Tarigan, Efrata; Kamil, Idham; Sutrisno, Joko
International Journal of Engineering, Science and Information Technology Vol 6, No 1 (2026)
Publisher : Malikussaleh University, Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52088/ijesty.v6i1.1795

Abstract

Drill pipes are critical components in oil, gas, and geothermal drilling operations, serving as conduits for circulating drilling fluids from the surface to the borehole while simultaneously transmitting mechanical loads. Due to severe operating conditions, including high pressure, cyclic loading, and corrosive environments, the integrity of welded joints in drill pipes must be ensured through appropriate welding methods and quality evaluation. This study investigates the effects of heat input variations on the mechanical properties and microstructural characteristics of welded joints in ASTM A106 Grade B steel pipes produced using Shielded Metal Arc Welding (SMAW) and Gas Metal Arc Welding (GMAW). Welding was performed using a single V-groove butt joint configuration in the 1G position with a constant welding current of 140 A. SMAW welding employed E7018 electrodes, while GMAW utilized ER70S-6 filler wire with a shielding gas mixture of 70% argon and 30% CO?. Mechanical performance was evaluated through bending tests, including root and face bends, in accordance with applicable standards. In addition, microstructural analysis of the weld metal and Heat Affected Zone (HAZ) was conducted using optical microscopy after chemical etching to identify phase distribution and grain morphology. The bending test results revealed that SMAW-welded joints exhibited higher ultimate stress (?u) values than GMAW-welded joints. The highest ?u value of 1327.14 MPa was obtained from the SMAW face bend specimen, while the lowest value of 922.10 MPa was recorded for the GMAW root bend specimen. Furthermore, face-bend tests consistently yielded higher ?u values than root-bend tests for both welding methods, indicating superior mechanical resistance at the weld surface. Microstructural observations showed that SMAW welds exhibited coarser ferrite–pearlite grain structures due to higher heat input and slower cooling rates associated with flux-covered electrodes. In contrast, GMAW welds exhibited finer, more homogeneous microstructures due to lower heat input and faster cooling rates. These differences in microstructure significantly influenced the mechanical behaviour of the welded joints. The findings of this study provide valuable insights into selecting welding methods for ASTM A106 Grade B pipes, particularly in applications that require a balance between mechanical strength and microstructural stability
Co-Authors Agustini, Aulia Rahayu Alexander Sebayang anasril, anasril Bangun, Positron Fitriani Fitriani Fitrianti Fitrianti, Fitrianti Ginting, Berta Girsang, Marensius Hanum, Fida Hassan, Faisal Fahmi Hutabarat, Udur Januari Idhamkamil, Idhamkamil Ira Herawati, Ira Irianto, Achmad Joko Sutrisno Kamil, Idham Muhammad Ariyon Naibaho, Winfronstein PARDEDE, SAUT PARSAORAN Paskel, M. Piere Sam Prasetia, Tengku Geby Rasta Sholeha, Dewi SIANTURI, TAMBOS AUGUST Sihar Siahaan simanjuntak, benrad edwin Suhesti TARIGAN, KRISTIAN Tarigan, Liwat Tarigan, Piktor Tri Aulia, Yuni