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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 5 Documents
 1 
Search results for , issue "Vol 5, No 2 (2023): December" : 5 Documents clear
Analysis of variations in the number of layers of hardfacing overlay ABREX 500 material on hardness,impact strength and microstructure with the SMAW process Amri, Moh. Syaiful; Anggara, Dika; rohmat, Imam Khoirul; Kurniyanto, Hendri Budi; Pradana, Dika Septya
Journal of Welding Technology Vol 5, No 2 (2023): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v5i2.4286

Abstract

Hardfacing is a welding technique that functions to increase the surface hardness value of a material. Generally, hardfacing is done on low-carbon steel materials because low-carbon steel cannot be increased in hardness by heat treatment. For this reason, research will be carried out on the multilayer hardfacing process with the aim of obtaining optimal layer hardness. The methodology in this research is that multilayer hardfacing welding will be carried out consisting of 3 layers, 4 layers, and 5 layers, and each specimen has 2 buffer layer layers with E 309 electrodes for the hardfacing layer using HV 600 electrodes. This research reveals the influence of the number of layers of hardfacing on the hardness and toughness values. ABREX 500 material with a size of 150x150x10 mm was welded using the SMAW process using a current of 130 A. In this research, hardness and toughness tests were carried out. On test results. The base metal microstructure is dominated by a tempered martensite structure with a small amount of bainite and pearlite. In the structural area of the support layer, austenite and vermicular ferrite dominate. In the hardfacing layer area, austenite and vermicular ferrite, which are in dendritic form, dominate. The increase in hardness will occur significantly after hardfacing is carried out on the base metal. In a specimen, the more layers of hardfacing are added, the harder the material will be. The hardness of the specimen in 5 layers gets the most optimal value (higher) when compared with the hardness in 3 layers and 4 layers. In the 5-layer specimen, the resulting hardness value was 482.13 kgf/mm2, for the 4-layer specimen, the average value was 464.83 kgf/mm2, and in the 3-layer specimen, the hardness value was 444.13 kgf/mm2. For toughness testing, the highest toughness value was obtained, namely 1.32 (J/mm2) for the 3 layers specimen, compared to 4 layers with a toughness value of 1.25 (J/mm2) and 5 layer with a toughness value of 1.19 (J/mm2). The toughness value decreases as the hardness value increases.
Analysis of quenching temperature variations in the heat straightening processFor multiple ripair FCAW welding HSLA SM490YA material Wahyudi, Mohammad Thoriq; Amri, Moh Syaiful Amri; Ari, Muhamad; Adam, Mukhlis; Hamzah, Fais; Novaldi, Azriel Harsha
Journal of Welding Technology Vol 5, No 2 (2023): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v5i2.4633

Abstract

In the steel structure fabrication industry, girders play a crucial role as supporting beams during construction. The girder's components include end plates and beams, with the end plate serving as a critical connection point for the beam to the column. Welding at this juncture demands careful consideration. This analytical research focuses on the impact of multiple repair welding and quenching temperatures during the heat straightening process on the toughness and microstructure of HSLA SM490YA material, utilizing FCAW welding. To assess the effects of multiple repair welding, the study compares different repair scenarios—welding without repair, two repairs, and three repairs, all performed at a 50% depth. Subsequently, the heat straightening process occurs at a temperature of 650ºC on the repaired material. Post-heat straightening, quenching is carried out with temperature variations of 650ºC, 475ºC, and 300ºC. The findings indicate that the repair process during welding and subsequent quenching after the heat straightening process leads to a decrease in toughness values. This results in a finer grain size, with the material phase predominantly composed of pearlite. These research outcomes should be carefully considered by industry professionals, particularly in critical connections, when determining quenching temperatures after the heat straightening process in repair procedures.
The influence of prandtl number on flow characteristics of the fume from GMAW welding Luthfi, Luthfi
Journal of Welding Technology Vol 5, No 2 (2023): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v5i2.4024

Abstract

GMAW has become one of the most popular welding methods due to its high productivity in the manufacturing industry. However, there has been agrowing concern about the health effects of the fume produced by this welding method, as it may flow into the breathing zone of the welding operator.In this study, the impact of the Pr number on the behavior of the fume flow produced by GMAW was studied numerically using Computational Fluid Dynamics (CFD) simulation. Navier-Stokes and energy equations in two-dimensional axisymmetric coordinates were used to establish the numerical model for the GMAW fume flow.A transient finite-volume method with non-staggered mesh was applied to solve the numerical model. The numerical simulations were run 2.0 ≤ Pr ≤ 15.0 with other parameters kept constant at Fr = 5.5, Re = 100, and H/X0 = 10. The time series of the spreading distance plotted at various Prnumbers show different types of distances at different stages of the fume flow, the initial maximum, the maximum, and the final distances. When the Pr number is increased from 2.0 to 15.0.the gap between the initial maximum and the maximum distances decreases while the gap between the initial maximum and the final distances decreases.A nonlinear relationship was observed when the initial maximum and final distance data were plotted against the Pr number. The best fit for the initial maximum and the final distance data were obtained using the power of -1/2 and -2/3.
The effect of rootgap distance and polarity on deffects in SMAW welding procedure Nurfauziah, Ade; Nurlela, Nurlela; Hidayat, Topik; Manullang, Wahyu Efendi; Wibisono putra, Ananda Yhuto
Journal of Welding Technology Vol 5, No 2 (2023): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v5i2.4038

Abstract

SMAW (Shielded Metal Arc Welding) welding has wide applications in the industrial world. To master welding technology, it is necessary to carry out further research on the effect of gaps on the microstructure after experiencing welding. Welding is a process of joining metalsby heating process, because of that, the process can change the basic properties of the base material. In this study, the material used was ASTM A36 carbon steel. That material was weldedby many variables that have been determined and the limitations of the problem during the study. The required specimen welding results are 6 pieces. There are three kindsof variables in this research; theywere independent variables, namely the Rootgap distance and polarity on the electrodes of the SMAW welding machine, using two types of polarity, namely (DCEN) and (DCEP). The dependent variables in this study were defects in the translucency of SMAW welding results obtained bySolvent Penetrant Testing method. The control variables in this study were welding current 90A, Voltage 21V, Electrode AWS A5.1 E6013 with SMAW welding process and Butt-joint welding type. The welding joint was a V-groovewith 30º of bevel angle and 2mm of root face. The study results showed that the welding translucency is affected by polarity and rootgap distance, where the DCEN polarity showed better translucent welding results than welding with DCEP polarity, even though it was still not in accordance with the standard.
Analysis of Bending Methods on BjTP 280 Roundbars on Hardness and Microstructure Muttaqin, Adzin Hanif; Munir, Mohammad Miftachul; Rohmat, Imam Khoirul
Journal of Welding Technology Vol 5, No 2 (2023): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v5i2.4197

Abstract

Reinforcing steel or commonly called roundbars is a material that is often used in industry, this is because the material is strong and easy to find anywhere. Deformation has a relationship to hardness. The higher the deformation value, the higher the material hardness value, but this is inversely proportional to the grain change, where the greater the deformation, the smaller the grain size. This research aims to determine the hardness and microstructure values of cold bending and hot bending treatments. Research by carrying out cold bending and hot bending which is connected to roundbars material without BjTP 280 bending treatment with the SMAW welding process. The highest hardness value is shown in the HAZ area of the hot bending specimen with a hardness value of 239.97 HV with a fine and small microstructure so it has the highest hardness value.

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