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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 55 Documents
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Fillet weld strength analysis for cantilever loading: an investigation of single-sided fillet weld strength in bending applications Tyler J. McPheron; Robert M. Stwalley III
Journal of Welding Technology Vol 6, No 1 (2024): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v6i1.4997

Abstract

Theoretical calculations for assessing the strength of a welded connection in design rely on two parameters: the tensile strength of the weld filler metal and the effective area. It is important to note that the type of load applied can significantly affect the theoretical strength of the weld. According to the AWS Structural Welding Code D1.1, when the load is applied parallel to the weld in a welded member, a reduction of 70% is recommended. This remaining factor of 0.30 has been determined through well-accepted tests to provide factors of safety between 2.2 for shearing forces parallel to the longitudinal axis of the weld and 4.6 for forces normal to the axis under service loading. When a load is applied perpendicular to the weld in a welded member, the entire value of the tensile strength of the weld filler metal is used to calculate the strength. However, there are no similar considerations for a load applied in a bending configuration. While it is not recommended for structural design, fillet welded members can experience loading that causes material deflection, resulting in a bending scenario. This is particularly relevant in repairs. The configuration of a cantilevered beam creates a different loading scenario with additional stresses on the weld, which differ from those of a perpendicular or parallel load. This research experiment was conducted to initially understand and analyze the strength of a GMAW weld under cantilevered bending and to derive a mathematical equation that provides a factor of safety in the range of 2.2-4.6, similar to the previous findings.
The effect of rootgap distance and polarity on deffects in SMAW welding procedure Ade Nurfauziah; Nurlela Nurlela; Topik Hidayat; Wahyu Efendi Manullang; Ananda Yhuto Wibisono putra
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.
Tensile test and hardness test on FCAW-GS welding results of AB/EH36Z35 material in 3G downhill position Robi Hardi Lubis; Mega Gemala; Domi Kamsyah; Annisa Fyona; Roni Saputra
Journal of Welding Technology Vol 6, No 1 (2024): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v6i1.5037

Abstract

Welding is a crucial aspect of the modern construction industry as it allows for efficient and reliable joining of metals. The purpose of this research is to evaluate the FCAW-GS welding process on AB/EH36Z35 material in the 3G downhill position. Additionally, the study aims to analyze the tensile and hardness test results of the welding. The research utilized the FCAW-GS welding method, with tensile testing conducted by the AWS D1.1/D1.1 M:2015 standard. Hardness testing was performed using the Vickers hardness test method with a test load of 10 Kgf, following the ASTM E92:2017 standard. The results of the tensile tests demonstrate that both specimens achieved high tensile strength. Furthermore, the hardness testing indicated no significant changes in material hardness in the HAZ and Line 3 areas. Consequently, this study's findings adhere to the quality standards outlined by AWS D1.1/D1.1M:2015 and ASTM E92:2017, making them a valuable reference for industrial welding processes
Analysis of Bending Methods on BjTP 280 Roundbars on Hardness and Microstructure Adzin Hanif Muttaqin; Mohammad Miftachul Munir; Imam Khoirul Rohmat
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.
Influence of shielding gas flow on the TIG welding process using stainless steel 304 material Aljufri Aljufri; Sofyan Sofyan; Muhammad Nuzan Rizki; Reza Putra; Indra Mawardi
Journal of Welding Technology Vol 6, No 1 (2024): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v6i1.5322

Abstract

A common issue encountered with main heat exchanger equipment is improper operation, which can lead to the development of cracks in the stainless-steel pipes. The welding process alters the metal microstructure in the heat-affected zone, thereby affecting the mechanical properties of the welded joint. To mitigate this issue, TIG welding with argon shielding gas is employed. This method helps prevent oxidation and ensures the formation of a stable welding arc in 304 stainless steel, which is renowned for its excellent mechanical properties and corrosion resistance. The objective of this study is to evaluate the impact of variations in shielding gas flow on the mechanical properties of 304 stainless steel plates during the TIG welding process. The aim is to determine the optimal settings for producing robust and long-lasting welded joints. To assess the hardness of the welded joints, we employed a Brinell-type Hardness Tester FB-3000LC machine. A Brinell steel ball indenter measuring 5 mm on the HBW scale and applying a load of 125 Kgf was utilized. At a protective gas flow rate of 8 L/min, the average tensile stress was 44.72 N/mm², strain was 0.177, modulus of elasticity was 2518 MPa, and hardness was 99.712 HBW. Increasing the gas flow rate to 13 L/min resulted in an average tensile stress of 47.50 N/mm², strain of 0.189, elastic modulus of 2525 MPa, and hardness of 105.522 HBW. Further increasing the gas flow rate to 18 L/min led to an average tensile stress of 49.69 N/mm², strain of 0.192, modulus of elasticity of 2597 MPa, and hardness of 106.704 HBW. Based on the research findings, it was observed that the weld area exhibited an increase in hardness values due to the heat generated during the welding process. The use of protective gas flow during welding is deemed effective in producing well-formed welded joints, as it prevents fractures from occurring within the weld area during the tensile test process. The choice of protective gas is determined by the dimensions of the material plate.

Page 6 of 6 | Total Record : 55

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