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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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Fillet weld strength analysis for cantilever loading: an investigation of single-sided fillet weld strength in bending applications McPheron, Tyler J.; M. Stwalley III, Robert
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 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.
Tensile test and hardness test on FCAW-GS welding results of AB/EH36Z35 material in 3G downhill position Lubis, Robi Hardi; Gemala, Mega; Kamsyah, Domi; Fyona, Annisa; Saputra, Roni
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 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.
Influence of shielding gas flow on the TIG welding process using stainless steel 304 material Aljufri, Aljufri; Sofyan, Sofyan; Rizki, Muhammad Nuzan; Putra, Reza; Mawardi, Indra
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.
Comparative analysis of electrode, preheat, and interpass combination in dissimilar GMAW welding of bisalloy 400 steel and SM490YA material on hardness and micro structure Munir, Moh. Miftachul; Kusminah, Imah Luluk; Kamilah, Nadhifatul
Journal of Welding Technology Vol 6, No 2 (2024): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v6i2.5942

Abstract

A construction company produced a side-dump type trailer used to transport coal, but it suffered damage in the form of cracks in the welding joints on the floor. The weld joint uses two different materials, Bissalloy 400 and SM490YA steel. This study aims to analyze the damage and repair it using appropriate electrodes, preheating, and interpass temperature, which affect the hardness and microstructure of both materials. The hardness test results showed that the highest value reached 385 HVN. Increasing the preheat and interpass temperatures was found to decrease the material's hardness. Microstructure analysis revealed phase changes in the weld metal, including mixing of martensite phase, ferrite phase, and pearlite phase. The use of a buffer layer between dissimilar materials proved effective in reducing the risk of cracking and deformation. This research confirms the importance of selecting appropriate welding parameters to improve joint quality in materials with significant carbon equivalent differences.
Analysis of mechanical properties on API 5CT pipe casing welded using GTAW- SMAW process Syukran, Syukran; Azwinur, Azwinur; Fachrurrazi, Fachrurrazi
Journal of Welding Technology Vol 6, No 2 (2024): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v6i2.5961

Abstract

The drilling process commonly employs API 5CT pipes, one type of which is API 5CT Casing Pipe Grade L80 Type-1. Long casing pipes are generally connected using the Threaded and Coupled (male-female) method. In certain conditions, welding is used for joining, and the combination welding process GTAW-SMAW is commonly employed in the field. The electrodes used are generally ER-70S-G (GTAW) and E7010-P1 (SMAW). The E7010-P1 electrode is difficult to obtain in the field. It is not only expensive but also scarce. Therefore, in some cases, construction contractors often substitute the E7010-P1 electrode with E7016, which is more readily available. This substitution is based on the consideration that both electrodes have similar tensile strength values (70ksi). This study aims to determine the mechanical properties of the joint process of API 5CT Casing Pipe Grade L80 Type-1 using E7016 electrodes and to evaluate the feasibility of substituting it for the E7010-P1 electrode. NDT testing was performed using a penetrant test, while DT testing was carried out using Vickers Hardness testing. The hardness test results showed that the highest average hardness value was found in the material using the E7016 electrode, which was 304 HVN, specifically in the weld metal area. Based on these results, E7016 can be recommended as a substitute for the E7010-P1 electrode.
The effect of welding current on the mechanical properties of aluminium to copper material using Tungsten Innert Gas welding technology Azwinur, Azwinur; Saifuddin, Saifuddin; Saputra, Rudi Mardian
Journal of Welding Technology Vol 6, No 2 (2024): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v6i2.6059

Abstract

Welding copper and aluminium is a major challenge due to the differences in physical and metallurgical properties of the two materials. Copper has a much higher melting point than aluminium, making it difficult to achieve uniform fusion without overheating. In addition, copper's very high thermal conductivity causes rapid heat transfer, making it difficult to maintain optimal temperatures during welding. The purpose of this study was to determine the effect of TIG welding current on the shear test value and hardness of aluminium-copper material. The stages of the research method began with welding variations in welding current and filler rod types. Furthermore, shear and hardness tests were carried out. Based on the results of the hardness test, the hardness value of the welded material was higher than the parent material. The hardness value of the weld metal was higher at a current of 130A compared to currents of 120A and 140A. While the optimal welding current for copper and aluminium joints in shear test testing using BCuP-2 filler rods is 130 A, where the highest shear strength is achieved
Weldability of welded joint alloy steel grade 91 to stainless steel grade 316L using filler metal ER NiCrMo-3 and ER 309LMo in power boiler piping and tubing Kurniyanto, Hendri Budi; Rohmat, Imam Khoirul; Muh Sulhan, Ilham Ainur Rosyid; Marzuki, Marzuki
Journal of Welding Technology Vol 6, No 2 (2024): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v6i2.6096

Abstract

Welded joints between high alloy steel and austenitic stainless steel are commonly used in the power plant industry. In this research, the materials used were SA-335 P91 and 316L stainless steel with ERNiCrMo-3 and 309LMo fillers designed with a butt joint configuration. Several mechanical test (tensile test ASTM E8, Hardness Test ASTM E92) and microstructure examination was carried out to determine the tensile strength, hardness and microstructure of welded joint. The highest tensile strength is found in the ERNiCrMo-3 filler metal, namely 354.085 MPa, while the lowest is found in the 309LMo filler metal, namely 349.87 MPa. The highest hardness values for the ERNiCrMo-3 filler metal are found in base metal P91, HAZ P91, weld metal, HAZ stainless steel 316L, and base metal stainless steel 316L, with values respectively 212.77 HVN, 278 HVN, 239.53 HVN , 189.32 HVN, and 180.40 HVN. The lowest values for the 309LMo filler metal are 210.13 HVN, 266.12 HVN, 206.48 HVN, 175.59 HVN, and 172.32 HVN. Microstructural observations show the formation of a dendrite phase in the weld metal area with ERNiCrMo-3 filler metal and a delta ferrite phase in the weld metal area with 309LMo filler metal. No phase changes were observed in the P91 base metal, P91 HAZ, 316L stainless steel base metal, or 316L stainless steel HAZ areas. The results of the corrosion resistance test show that specimens with the ERNiCrMo-3 filler metal are more resistant to pitting corrosion compared to specimens with the 309LMo filler metal. The corrosion rate is 12,50 mm/years for ERNiCrMo-3, and 18,94 mm/years for 309LMo filler metal.
Analysis of welding time on microstructure, hardness, and torque of arc stud welding process Amri, Moh. Syaiful; Mukhlis, Mukhlis; Ari, Muhammad; Wibowo, Alvalo Toto; Isworo, Annas Dwi
Journal of Welding Technology Vol 6, No 2 (2024): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v6i2.5739

Abstract

The manufacturing industry plays an important role in improving the national economy. One of the metal joining methods currently used is arc stud welding. Stud welding is used for welding bolts, which are useful for connecting parts in steel structures. This research was conducted with variations in current strength parameters of 200A, with welding times of 1, 2, and 3 seconds. The purpose of this research is to find the best parameters to determine the depth of penetration, heat-affected zone, and fusion zone of welding joints in A36 material. Macro testing results show that there are no defects such as cracks in the base metal, HAZ, or weld metal, meeting the ASME Sec. IX acceptance requirements. In addition, since the heat input remained within acceptable limits in the base metal areas of A36 and SS 304, the microtest results did not show significant changes. In the hardness test, the weld metal region obtained the highest value. The lowest average value was 192.85 HVN in the stud 1 specimen, while the highest average value was 195.37 HVN in the stud 3 specimen. The torque test shows that variations in welding time affect the torque strength; in specimen 3, it ranges from 50 Nm to 80 Nm.

Page 6 of 7 | Total Record : 65

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