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All Journal BERKALA SAINSTEK SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin REKAYASA Jurnal Jaring SainTek Zona Laut : Jurnal Inovasi Sains dan Teknologi Kelautan Jurnal Jalasena
Nugroho, Nur Yanu
Teknik Perkapalan, Fakultas Teknik Dan Ilmu Kelautan, Universitas Hang Tuah
Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Transportation

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Holding Time pada Sifat Fisik Pengelasan SMAW Baja ASTM-A36 melalui Uji Penetran Yoga Mangun Wirajaya; Nur Yanu Nugroho; Bagiyo Suwasono
Jurnal Jaring SainTek Vol. 3 No. 2 (2021): Oktober 2021
Publisher : Fakultas Teknik, Universitas Bhayangkara Jakarta Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31599/jaringsaintek.v3i2.716

Abstract

In the industrialized world, low-carbon steel was often used as a construction material. One of the problems obtained in the low carbon steel welding process was its nature  susceptible to shakes.  The minimize the formation of residual voltage in the connection area (Heat Affected Zone) can be done by the Post Weld Heat Treatment (PWHT) process The purpose of this study was to find out the effect caused by variations in heat treatment on heating steel ASTM A36 (Holding Time) to penetrant tests and determine the suitable temperature given to ASTM A36 steel after the welding process. The PWHT process was carried out with several variations of Holding Time, namely 1 hour, 2 hours, and 3 hours at 400 °C.  Based on penetrant testing showed that the best value in Holding Time was 3 hours with no appearance of porosity defects
PENGARUH PENGGUNAAN BACKING KERAMIK TERHADAP KEKUATAN UJI BENDING PADA ASTM A36 DENGAN MENGGUNAKAN PROSES SMAW Defri Herdiansyah; Nur Yanu Nugroho
JURNAL JALASENA Vol 4 No 1 (2022): AGUSTUS 2022
Publisher : Fakultas Sains dan Teknologi Universitas Karimun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51742/jalasena.v4i1.610

Abstract

Welding with SMAW is usually used to fulfill the needs of home scale and large projects. When welding metal on large structures such as ships, the welder often has to weld back and forth on both sides of the ship, thus wasting time and energy. Therefore, a ceramic backing that serves as a support and molds good weld results. This saves budget and speeds up the welding process. From the above discussion, it is necessary to examine the effect of using ceramic backing on the strength of the ASTM A36 steel bending test results using SMAW welding. This research is an experimental research and the data analysis technique used is analysis of variance (ANOVA). From the results of the tensile test, there is an effect of strength on ASTM A36 steel when viewed from the average value of Ultimate tensile strength found in specimen testing that does not use backing, the average value obtained is 451.893 N/mm2. test analysis of variance, It is known that the calculated F is 5.501 and the F table is 7.71. From the data obtained F count < F table 5.501 < 7.71 then H0 is accepted and the decision taken is H0, which means there is no difference. From the results of the bending test, there is an effect of strength on ASTM A36 steel if it is seen that the average value of the bending test is significant. test Analysis of Variance. It is known that the calculated F is 21.711 and the F table is 7.71. From the data obtained, F count > F table, H0 is rejected and the decision taken is H1, which means that there is a difference in the average bending test using backing and without backing on ASTM A36 specimens.
PENGARUH HOLDING TIME PADA BAJA ST 40 DENGAN PENGELASAN FCAW TERHADAP UJI TARIK DAN KEKERASAN Hyang Adhyawantara; Nur Yanu Nugroho
JURNAL JALASENA Vol 4 No 2 (2023): FEBRUARI 2023
Publisher : Fakultas Sains dan Teknologi Universitas Karimun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51742/jalasena.v4i2.869

Abstract

Welding is a process of joining metal objects using heat energy. In the welding process there is a problem that arises due to the uneven use of heat energy, namely residual stress, residual stress can cause cracks or defects in the weld. To reduce the risk of residual stresses forming in the joint area (HAZ) it can be carried out with the Post weld heat treatment (PWHT) process or the heat treatment process on the material after undergoing the welding process. This research was conducted to determine the effect of PWHT holding time variations on mechanical properties and also aims to determine how much holding time is appropriate for ST40 steel. In this study the PWHT temperature used was 875º C with 3 variations of holding time (45 minutes, 60 minutes and 75 minutes). Welding uses the FCAW (Flux-Cored Arc Welding) method with a 60º V seam and 1G position. Welding results are tested by tensile test and hardness test. From the results of the tensile test the best value was obtained at 60 minutes Holding Time of 384.5 MPa. The best hardness value was obtained by Holding Time 75 minutes of 137.8 HVN in the weld metal area.
SIFAT MEKANIK ALUMINIUM 5052 PADA PENGELASAN MIG DENGAN VARIASI UKURAN BACKING CERAMIC Evhardi Danang Susatyo; Nur Yanu Nugroho
JURNAL JALASENA Vol 4 No 2 (2023): FEBRUARI 2023
Publisher : Fakultas Sains dan Teknologi Universitas Karimun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51742/jalasena.v4i2.873

Abstract

In the modern world, the use of aluminum in the field of construction has often been encountered, including in the field of ship construction. When the welding process is on large construction structures such as ships, it sometimes requires a back and forth welding process, therefore a media in the form of a ceramic backing is used as a support and prints the results of the weld for better results. Using this ceramic backing can save budget and can speed up the work process. From the discussion above, it is necessary to conduct research on the effect of ceramic backing diameter on Aluminum 5052 welding using the MIG (Metal Inert Gas) welding process with a diameter ratio of 6mm, 12mm and 14mm, which aims to compare the results of welding on tensile strength, bending strength, macrographic observation, and penetrant testing. From the results of the Tensile test, the highest average value was obtained for the 6mm Ceramic Backing variation of 64.94 Mpa. From the results of the bending test the best results were obtained on the 14mm Ceramic Backing variation with the minimum crack results of 0.4mm. From the results of the penetrant test, the best results were found in the 12mm Ceramic Backing variation, only 1 rounded of 0.6mm was found. From the results of the macrographic test the best results were found in the 12mm Ceramic Backing variation because there were minimal defects found in the welds.
Identifikasi Kekuatan Butt Joint dan Lap Joint pada Pengelasan Konstruksi Kapal Bagiyo Suwasono; Muhammad Farizal; Nur Yanu Nugroho; Didik Hardianto
Rekayasa Vol 16, No 2: Agustus 2023
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v16i2.19914

Abstract

The joining of steel in ship construction was carried out through welding technology. One of the joining processes used two types of welded joints, namely butt and lap joints. This study identified the strength of the test material from ASTM A36 steel plates at welded joints by standardizing the tensile test. Experimental activities using a tensile testing machine and simulation activities using SolidWorks. The average tensile test values for butt and lap joints show yield strengths of 288.89 and 200 N/mm2, final strengths of 419.11 and 280 N/mm2, reduction of cross-sectional areas of 49.33 and 43.33%, strain 7% and 18.67%, modulus of elasticity 60.81 and 15 N/mm2. Tensile test simulations for butt and lap joints showed plastic deformation in the weld face, root, toe, and HAZ area. Experimental and simulated difference values for butt joints range from 941.67 to 1,519.67 N/m2, and lap joints range from 1,030 to 4,694 N/m2. The final results show that SMAW welding with the butt joint type has a higher strength value than the lap joint.
Heat Transfer Analysis of Sandwich Plate System Application As Insulation Material for Fishing Vessels Hatches by Finite Element Method Syauqi, Syafiq Ahmad; Nugroho, Nur Yanu; Hardianto, Didik; Azhar, Ali
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 18 No. 1 (2024): SINTEK JURNAL
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.18.1.6-12

Abstract

Fish is a highly perishable food due to its suitability as a substrate for the growth of spoilage microbes, particularly bacteria. One method to maintain fish quality and extend its shelf life is preservation through a cooling system, where the duration of effective storage in the hatch is influenced by the quality of the insulation wall. Previous research modified the hatch insulation wall using a rice husk and white cement composition; however, these materials proved neither effective nor efficient in maintaining cooling temperatures. This study aims to determine the effect of heat transfer in a sandwich plate system on cooling time and temperature. Experiments were conducted using three variations in core layer thickness within a stainless steel-polyurethane-stainless steel configuration. The results indicated that at a temperature of 4°C, the maximum cooling times for each core layer thickness variation were as follows: variation 1 (3-20-3mm) lasted 62.5 hours, variation 2 (3-25-3mm) lasted 64 hours, and variation 3 (3-30-3mm) lasted 65.5 hours. The findings demonstrate that an increase in core layer thickness results in a prolonged maintenance of the cooling temperature within the hatch.
Effect of Air Humidity in MIG Welded Joints on Tensile Strength and Impact Strength of Aluminum 5052 Nduru, Fandi Bachtiar; Nugroho, Nur Yanu
BERKALA SAINSTEK Vol 11 No 2 (2023)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v11i2.37546

Abstract

In the shipbuilding process, delays often occur. In general, to speed up a ship's construction, overtime is carried out by workers until nighttime. Environmental conditions in a welding process, especially air humidity, strongly affect the properties of welded joints. The formation of hydrogen in the air caused by an inappropriate environment can cause defects in welded joints, especially porosity defects. Variations of welding environmental conditions used, are welding in the morning at 84% air humidity, daytime welding at 53% air humidity, and nighttime welding at 77% air humidity. This study aims to determine the material strength of air humidity variations during the welding process on the tensile strength and impact strength of 5052 aluminum material. This research uses experimental quantitative methods data analysis techniques used analysis of variance (ANOVA). The results showed that the higher the air humidity, the tensile and impact strength decreased. From the results of the tensile test, there is an influence of air humidity on the average value of tensile strength, where the highest value is found in the daytime welding variation specimen with 53% air humidity, worth 110.614 MPa. From the impact test results, there is an influence of air humidity on the average value of impact toughness, where the highest value is found in the daytime welding variation specimen with 53% air humidity, worth 89.42 J/mm2. From the ANOVA test results, the average tensile test and impact test have no significant differences.
DISTRIBUSI TEGANGAN SAMBUNGAN LAS TERHADAP SUDUT SAMBUNGAN PELAT BADAN KAPAL DENGAN PEMODELAN METODE ELEMEN HINGGA Nugroho, Nur Yanu; Pramana Putra, Irvan; Widodo, Ahmad Basuki
Zona Laut : Jurnal Inovasi Sains Dan Teknologi Kelautan Volume 6, Number 2, July 2025 Edition
Publisher : Departemen Teknik Kelautan Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62012/zl.vi.36304

Abstract

Welding is the process of joining 2 metals using a heat process. Ship repair is a ship care and maintenance activity that is planned periodically in accordance with the requirements of the classification body. It is not uncommon for a shipbuilding industry to carry out replating procedures that do not comply with the regulations of the classification body. It is often found in the replating process that plate joints have angles of less than 90°. This research explores the effect of the cutting angle of ship hull plates on the stress distribution in welded joints of ship hull plates using the finite element method with Solidworks simulation software using ASTM A36 material, taking angles of 30°, 40°, 50°, 60°, 70°, 90°. Based on the test results using Solidworks, we can see that the minimum stress results are at a 30o angle variation with a value of 92.6 N/mm2, and the maximum value is at a 90o angle with a value of 281 N/mm2. With several variations of these angles, those that meet BKI standards are the 80o angle and the 90o angle, each of which has a yield strength value that meets the standards set by the classification. To ensure the safety and durability of the ship's plate, it is recommended that the plate be cut at an 80° or 90° angle. These corners not only meet BKI standards but also demonstrate a more stable and even stress distribution, reducing the risk of material failure.
Co-Authors Ahmad Basuki Widodo Ali Azhar Bagiyo Suwasono Defri Herdiansyah Didik Hardianto Evhardi Danang Susatyo Hyang Adhyawantara Muhammad Farizal Nduru, Fandi Bachtiar Pramana Putra, Irvan Syauqi, Syafiq Ahmad Yoga Mangun Wirajaya