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Journal of Welding Technology
Published by Politeknik Negeri Lhokseumawe
ISSN : 27161471     EISSN : 27160475     DOI : -
Core Subject : Science, Engineering,
Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
The main scope of the journal is to publish original research articles in the area of Welding Technology The main focus of the journal is on experimental research. The scope of the journal includes;
Arjuna Subject : Ilmu Material (semua kategori) - Ilmu Material (Lain-Lain)
Articles 65 Documents
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The effect of cooling media on impact toughness and tensile strength after GTAW welding of aluminum alloy Margi Luhur, Galih Maulana; Salahudin, Xander; Hastuti, Sri
Journal of Welding Technology Vol 7, No 1 (2025): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v7i1.6992

Abstract

Aluminum 5083 is extensively utilized in ship hull construction due to its high impact resistance and superior tensile load capacity, offering a lightweight alternative to steel. In maintenance procedures, welding is a fundamental method for repairing damaged sections, with Gas Tungsten Arc Welding (GTAW) favored for its precise thermal control and minimal distortion. Among the critical factors influencing weld quality, the post-weld cooling process significantly affects the resulting microstructure and mechanical performance. This study examines the effects of various cooling media—namely, Bromus Soluble Oil Cutting Coolant, Castor oil, and Mesran Super SAE 20W-50 oil—on the impact toughness and tensile strength of GTAW-welded Aluminum 5083 with a current of 325 A and 220 V AC voltage. Mechanical properties were evaluated through Charpy impact testing and tensile testing by ASTM standards. The findings reveal that Bromus coolant yielded the highest impact toughness at 0.264 J/mm², whereas Bromus coolant achieved the highest tensile strength at 12.893 Kgf/mm². These results underscore the critical role of cooling medium selection in enhancing the mechanical integrity and durability of welded aluminum structures, as the bromus coolant significantly outperformed alternatives in both impact and tensile assessments
Evaluation of magnetic particle inspection for optimizing welding quality in back gouging boom structure preparation in heavy machinery Aryswan, Adhe; Hasibuan, Apriansyah Sutan; Butar Butar, Hendra; Havwini, Tian; Gemala, Mega
Journal of Welding Technology Vol 7, No 1 (2025): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v7i1.5618

Abstract

This study investigates the effectiveness of Magnetic Particle Inspection (MPI) in optimizing welding preparation for the back gouging of boom structures in hydraulic mining shovels. The primary objective is to evaluate MPI's efficiency in detecting surface and near-surface defects during the pre-welding stage, thereby improving the overall welding quality of boom structures, which play a critical role in supporting heavy loads. MPI is utilized as an initial inspection method prior to Ultrasonic Testing (UT), enabling early detection of potential defects and reducing the likelihood of failures during subsequent UT evaluations. The study reveals the presence of linear and rounded discontinuities that may compromise weld integrity. By applying MPI early in the process, the need for rework during UT is minimized, resulting in cost and time savings. Furthermore, the findings of this study contribute to supporting two key organizational initiatives—People, Quality, Velocity, Cost (PQVC) and Built-in Quality (BIQ)—which aim to enhance both the efficiency and reliability of the welding process.
Identifikasi Cacat Sambungan Las SMAW Tipe Butt Joint Pada Material Baja SS400 Menggunakan Metode Liquid Penetrant Test Dan Ultrasonic Test Al Faiq, M Rauf; Hastuti, Sri; Hadi, Nur; Mulyaningsih, Nani
Journal of Welding Technology Vol 7, No 1 (2025): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v7i1.6930

Abstract

SMAW welding is a type of electric arc welding, where the electrode is melted by the heat generated from the electric arc between the electrode tip and the workpiece. The working principle of SMAW welding is to use heat from an electric arc to melt the base metal and the tip of the electrode coated with flux, which also functions as a filler material in the metal joining process. The purpose of this study is to determine the effect of variations in current strength and electrode type on the type of weld defects in SS400 steel material welding joints. In this study, weld defects identified from liquid penetrant testing showed six types of defects, namely crack, porosity, incomplete fusion, slag inclusion, over spatter, and undercut, while ultrasonic testing found four types of defects, namely crack, incomplete penetration, incomplete fusion, and slag inclusion. Liquid penetrant and ultrasonic testing data show that the welding process using currents of 120 A and 110 A with E7016 electrodes has the most defects, meanwhile, at a current of 100 A with E7018 electrodes, it is a welding parameter with weld results that are protected from welding defects. Based on the test data, it can be concluded that variations in current and electrode type affect the number and type of weld defects that appear, which are influenced by the welding process, the amount of current, the diameter and type of electrode, electrical polarity and penetration rate. These parameters in SMAW welding determine the efficiency and quality of metal joining results.
Heat input calculation in GTAW welding to obtain values according to pWPS Irawan, Benny Haddli; Syahidah, Bilqiz Bazilah; Gemala, Mega
Journal of Welding Technology Vol 7, No 1 (2025): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v7i1.5976

Abstract

This study aims to determine the ideal heat input to remain within the constraints set in the preliminary Welding Procedure Specification (pWPS). Heat input greatly influences weld quality, mechanical properties, and residual stresses, yet accurate determination during Procedure Qualification Record (PQR) trials remains challenging. This research involved field data collection during PQR testing using two coupon specimens made of ASTM B564 UNS-N06625 and ASTM B444 UNS-N06625 Grade 1 materials, each with dimensions of 11.07 mm in thickness and 60.3 mm in diameter. The Gas Tungsten Arc Welding (GTAW) process was applied in the 6G position. The acceptable heat input ranges in the pWPS are: Root (1.0–2.5 kJ/mm), Hot (1.0–2.6), Filler (0.69–1.39), and Cap (0.6–1.1). In coupon test 1, two passes failed: Pass 3 (1.51) and Pass 5 (1.43). In coupon test 2, three passes exceeded limits: Pass 4 (1.64–1.97), Pass 5 (1.42–1.72), and Pass 8 (1.19). To ensure compliance, recommended heat input parameters were formulated. For the root pass, use 97–103 A, 9–10 V, over 4 min 40 sec (2.04–2.41 kJ/mm). For the hot pass, use 98–106 A, 9–10 V, for 4 min 48 sec (1.85–2.23). The filler pass should use 79–97 A, 9–10 V, for 3 min 39 sec (1.01–1.37), and the cap pass 81–90 A, 9–10 V, for 3 min 17 sec (0.64–0.79). These parameters aim to achieve high-quality welds in line with pWPS specifications.
The effect of weld groove variations on the impact toughness and hardness of AISI 1050 steel Iqbal, Maulana; Azwinur, Azwinur; Ibrahim, Akhyar
Journal of Welding Technology Vol 7, No 1 (2025): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v7i1.6688

Abstract

Shielded Metal Arc Welding (SMAW) is a metal joining process that utilizes heat energy to melt both the base metal and the electrode. This study aims to evaluate the effect of weld groove variations on the impact toughness and hardness of AISI 1050 steel. Three types of groove configurations were examined: V Groove, Bevel Groove, and Double V Groove. Tests were conducted in the regions of the Weld Metal, Weld Root, Heat-Affected Zone (HAZ), and Base Metal using a welding current of 100 Amperes. The test results show that the Bevel Groove produced the highest impact toughness at the Weld Root (1.78 Joule/mm²), the V Groove at the Weld Metal (1.65 Joule/mm²), and the Double V Groove at the HAZ (1.48 Joule/mm²). In terms of hardness, the V Groove and Double V Groove showed the highest values in the HAZ (86.5 HRC), while the Bevel Groove exhibited the highest hardness in the Base Metal (81 HRC). The lowest hardness value was found in the Weld Root of the Bevel Groove (56.67 HRC). Overall, the hardness values in the Weld Metal area for all three groove types were the same, measuring 76.5 HRC

Page 7 of 7 | Total Record : 65

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