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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 2, No 2 (2020): Desember" : 5 Documents clear
Desain tangki timbun external floating roof kapasitas 75000 MT Kevin Satria Nugraha; Muhamad Ari; Mochammad Al Amin Karim Al Amin
Journal of Welding Technology Vol 2, No 2 (2020): Desember
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v2i2.2063

Abstract

Storage tanks are widely used in industry, especially as a storage area for oil and gas mining products. Various types of storage tanks are made based on the pressure, the type of fluid stored and the type of roof used. The roof on the storage tank is divided into a fixed roof, internal floating roof and external floating roof. Floating roof is used as a barrier between the fluid and the empty space in the tank so as to minimize the occurrence of vapor space and the possibility of a fire in the tank. This study discusses the design of an external floating roof storage tank for condensate fluid with a capacity of 75000 metric tons. The design process for the shell course and other parts of the stockpile tank is based on the API 650 standard 12 addendum 2018 edition using the variable design point method. Verification of the results of calculations generated manually is done with finite element software. Manual calculations for the construction of an external floating roof heap tank get the minimum shell plate thickness used is 10 mm. The bottom plate was found to be 8 mm thick. The simulation using finite element software produces the maximum stress values on the shell, shell to bottom, and roof, namely 1.937 MPa, 7,122 MPa, 0.216 MPa, respectively. All stresses that occur are still below the allowable stress of the material. So it can be concluded that the tank construction is still safe
Pengaruh temperatur pelat landasan selama hot gas welding terhadap karakteristik kekuatan lasan lembaran HDPE Agus Setiawan; Kris Witono; Riswan E.W. Susanto
Journal of Welding Technology Vol 2, No 2 (2020): Desember
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v2i2.2069

Abstract

Plastic material failures such as fractures or can be repaired by joining. In the industrial world, the joining of two or more plastic parts can be done with plastic welding technology, one of the methods of plastic welding is hot-gas welding (HGW). HGW is a welding process for plastic materials, but it is known that plastic materials have poor heat conductivity. The aim of this research is to improve the quality of plastic material joints, in this case HDPE sheets, and effect of the base plate temperature and hot-gas temperature on the strength and impact, as well as the interaction effect of the base plate temperature and hot-gas temperature on tensile and hit strength. The method used in data collection is data processing method using factorial DOE. The temperature variation of the base plate during the welding process (30° C, 70° C, 110° C and 150° C), as well as the temperature of the hot air flow from the hot-gun (250° C, 300° C, and 350° C). To obtain the data, it was carried out by tensile and hit tests using standard specimens, respectively ASTM D 638-03 and ASTM D 6110. From the research results, it was found that the ground temperature and hot air flow temperature of the hot gun during the hot gas welding process had an effect on the tensile strength and hit HDPE weld joints. Optimization of tensile strength and hitting strength, respectively 18.78 MPa and 0.018567 J/mm2 (85.65% and 89.74% of the strength of HDPE without joints), these values are obtained from the combination of an anvil plate temperature of 150° C and flow hot air hot gan 250° C.
Pengaruh durasi waktu pengelasan pada proses las gesek terhadap sifat mekanik material AISI 1045 Andi Suhendar; Mawardi Mawardi; Akhyar Ibrahim
Journal of Welding Technology Vol 2, No 2 (2020): Desember
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v2i2.2031

Abstract

Welding is an important process in the industrial world and is an integral part of industrial growth. One type of welding that exists today is friction welding. Friction welding technology is a method of solid state welding where the heat source is generated by two metals rubbing together without any added metal. The purpose of this research is to determine the effect of welding time on the mechanical properties of the AISI 1045 material. The method used is to combine heat and pressure without the two metals being properly connected. Next, vary the welding time for 1 minute, 1.5 minutes, and 2 minutes with a rotation of 2500 rpm. After performing friction welding, each specimen will be subjected to a tensile test. From the research data shows that the friction welding process using 1 minute has the highest tensile strength value, namely 709.44 Mpa, then followed by 1.5 minutes, namely 439.64 Mpa, and then followed by 2 minutes, namely 145 79 Mpa. And then for the average hardness value at 1 minute is 74.20 HRC in the stir zone area, then for 1.5 minutes the average hardness value is 68.90 HRC in the stir zone area. Meanwhile, in 2 minutes, the Rockwell hardness value was 67.00 HRC. From the results of the research data, it can be concluded that the magnitude of the rotation and welding time affect the mechanical properties of the welding results
Analisa korosi pada sambungan repair body mobil menggunakan pengelasan oxy-acetylene Azwar Azwar; Boihaqi Boihaqi; Yuniati Yuniati
Journal of Welding Technology Vol 2, No 2 (2020): Desember
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v2i2.2084

Abstract

Corrosion in cars is influenced by environmental factors, namely humidity, weather, sea air, rainwater, muddy roads; and also by mechanical factors such as bumps and scratches. Car parts that are considered prone to corrosion are the areas where the welding joints or folds are located, which causes loss or rotten of body. The repair process is carried out by connecting the porous parts using oxy acitilline welding known as the Repair Body process. Welding uses a low carbon steel plate, or galvanized steel plate, then grinding and followed by a coating and painting process. However, in a relatively short period of time the section experienced deflection which was predicted due to corrosion in the weld joint area. This article will analyze the corrosion rate of oxiacitilline welding joints between AISI 4130 (car body) and ST 37 steel plates and Galvanized steel plates. The aim is to study the effect of the type of connection material, the effect of coating, the effect of immersion duration, and the effect of the corrosion medium on the corrosion rate. The determination of the corrosion rate refers to ASTM G31-72 (Standard Practice for Laboratory Immersion Corrosion Testing of Meta). The results showed that the highest corrosion rate occurred in the AISI 4130 specimen (car body) which was connected to ST 37 with HCl solution corrosion media, namely 5.2919 mmpy, while in NaCl media the corrosion rate was much lower, namely 0.1337 mmpy, and aquades amounting to 0.1098 mmpy with an immerson time of 272 hours. Meanwhile, the corrosion rate in AISI 4130 specimens connected with galvanized steel shows a slower corrosion rate compared to joints with ST 37 steel. Likewise, the coating process shows a decrease in the corrosion rate well.
Pengaruh masukan panas terhadap struktur mikro dan sifat mekanik sambungan pipa 5L X65 dengan proses pengelasan kombinasi STT SMAW Muhamad Iqbal Farhani; M Thoriq Wahyudi; Mochammad Karim Al Amin
Journal of Welding Technology Vol 2, No 2 (2020): Desember
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v2i2.2062

Abstract

Welding with the STT (Surface Tension Transfer) process is the latest innovation from the GTAW (Gas Tungsten Arc Welding) welding process, where STT is commonly used in the open root while the research carried out is the layer at the root and hot pass because it was chosen for the welding process with low heat input. . The research objective was to determine the effect of heat input or heat input of combination welding STT compared to GTAW on macro macro structure and mechanical properties of 5L X65 pipe welding joints. The results of this study compare the STT welding process with GTAW. Testing of the two processes will be assessed from the results of their mechanical properties through tensile and hardness, micro-macro structure and SEM. From the microstructure test and SEM, there is a not too significant effect on the differences in grain shape and content of ferrite acicular and ferrite widmanstatten, especially in the weldmetal area and grain changes in the HAZ area. From the hardness test, the comparison of the results of STT-SMAW, the hardness value is higher but not too significant than the GTAW-SMAW results due to the influence of heat input. The results from the tensile obtained that the STT-SMAW value has higher tensile strength and yield but not too significant compared to GTAW-SMAW, and all welding results still have values that fall into the standard range

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