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INDONESIA
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 4, No 2 (2022): December" : 5 Documents clear
Analysis of Hydro Test Pressure Variations on A106 Grade B Carbon Steel Pipe Welded Joints with Welding Repair Method Riswan E.W. Susanto; Kris Witono; Agus Setiawan; Risno Bayu
Journal of Welding Technology Vol 4, No 2 (2022): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v4i2.3556

Abstract

Transportation of oil and gas through oil refinery pipelines is faced with problems, including corrosion problems. Corrosion is a natural phenomenon that occurs in metal materials, where corrosion is a process of material damage due to chemical or electrochemical reactions with its environment. The purpose of this study is the results of the analysis of HydroTest pressure variations on the Welding Joints of Carbon Steel Pipes (carbon steel) A106 Gr.B. In the study did not discuss the occurrence of corrosion and other tests, while the welding process in detail was shown in WPS. This experimental research method uses the Welding Repair Method on welded joints according to the ASME IX, ASME B31.3 standard. The research material is A106 GR carbon steel pipe. B is in the form of a U Tube Seal Deck that has undergone corrosion and damage, where later the fabrication process (pipe repair) especially welding (using SMAW and GTAW) has been determined in PQR and WPS (WPS / CS / EM / ASME / WPxxx). The focus of this research is on stage 9 (hydro testing stage) of the Welding Repair method. Free variables in pressures of 240 Psi, 435 Psi, 690 Psi, and 910 Psi, which have been planned based on the thickness and length of the Pipe joint. Variable fixed temperature test Hydrotest 28OC, holding time holding time (pressurizing) 10 minutes and holding time peak 60 minutes before (depressurizing). The results were obtained that the pressure change was divided into two stages, pressurizing with the highest pressure of 915 Psi is the 4th pressure variation this was obtained from the test observation that there were no leaks in the welded joints and pipe materials in accordance with the acceptance criteria. While the second stage is (depressurizing) with a decrease in pressure or called realese, where successively realese 100%, 75%, 50%, 25%, and 0% at pressures of 915 Psi, 690 Psi, 435 Psi, 240 Psi, 0 Psi with the results of no leakage and observation test results in accordance with the acceptance criteria. So it can be concluded that the welded joints of carbon steel pipes tested using hydrotest, no deformation occurs, there is no change in shape and there are no leaks in the welded joint layer of A106 Gr.B carbon steel pipe
Residual Stress Analysis in Pipe Welding ASTM A106 Grade B Using FEM Simulation Hamdani Hamdani; Turmizi Turmizi; Bukhari Bukhari; Edi Saputra; Ilyas Yusuf
Journal of Welding Technology Vol 4, No 2 (2022): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v4i2.3507

Abstract

Fabrication technology has also penetrated the oil and gas industry, such as in the case of joining materials, one of the applications being made is the connection of pipes by welding. In the welding process, the heat distribution is uneven and the cooling rate is fast, resulting in residual stresses. This is indicated by changes in the microstructure in the weld area and the Heat Affecting Zone (HAZ), causing the material to become hard but brittle (brittle). This can cause structural failure in the connection area. This study investigates the residual stresses in pipe welding ASTM A 106 Grade B using the finite element method with ANSYS R17.2 software. The simulation is divided into 2 steps, namely thermal and structural analysis. The variation used in this simulation is the electric current as the welding heat input. The electric current is 110 A with an effective heat input of 2337.5 Watts with a maximum residual voltage of 399.59 MPa, 2762.5 Watts with a current of 130 A of 420.01 MPa, 3400 Watts with a current of 160 A of 454.06 MPa. The simulation shows that an increase in electric current in the range of 110 to 160 A can imply an increase in residual voltage. A welding heat input is obtained with the minimum residual voltage value, namely at a current of 110 A with an effective heat input of 2337.5 watts.
Inspection of Pipe Welds Using the Radiogrphy Method with the Double Wall Double Image Technique Aulia Riska; Syukran Syukran; Hasrin Lubis
Journal of Welding Technology Vol 4, No 2 (2022): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v4i2.2992

Abstract

Inspection of 900 angle pipe welds using the Radiography method with an Ir.192 source with a capacity of 150 Curie while operating 56 curies using the Double Wall Double Image Technique Case study at (PT. Sinar Mas, Riau). Errors and inaccuracies in timing result in the resulting image being damaged, not meeting radiographic film acceptance quality standards. irradiation (exposure time). The purpose of this paper is to be able to calculate the exposure time using computation, and to know the type of defects in the welding and there are significant undercutting defects that require repair or re-welding and are declared rejected by the radiographer. The results of the exposure time calculation between the calculations of several processes have a relatively large time difference, this is because they do not follow the curve value. In the end it can be concluded from the results of the film is very influential on the exposure time. Based on this, the resulting software can be declared in accordance with field conditions
Analysis of Defects in SMAW Welding Joint Using E 7016 Electrode Due to the Direct Cooling Process Aljufri Aljufri; Indra Mawardi
Journal of Welding Technology Vol 4, No 2 (2022): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v4i2.3304

Abstract

Welding defects in a construction if repairs are not immediately carried out, then in the weld defect area can cause cracks that are aggravated by wider cracking and corrosion so that it can cause brittle fractures to the detriment. The problem with brittle fracture is a big problem in steel that has been welded, especially in welded joints, this brittle fracture becomes more important due to the factors of voltage concentration, inappropriate structure and defects in the weld, the purpose of this study: to find out how to use suitable electrodes for ST 37 material in the welding process, whose cooling process directly uses Oil and water (Direct Colling Process),  and to obtain optimal welding results after going through the results of welding defect examination using the Penetrant Test method, and the Maghnetic Particle Test.  From the results of the examination research conducted by the Welding Inspection team of PT. Superintending Company of Indonesia (SUCOFINDO) to 15 ST 37 specimens that have undergone welding does not show any welding defects, in the sense that they are still within the acceptable limit criteria (Acceptance Standard Ansi B 31.3), from the results of tensile testing On the use of different electrodes in the welding process of ST 37 material, shows that the ST 37 material whose welding process uses electrode E7016 welded results and tensile strength is better than the  ST 37 material which in the welding process uses electrodeS E 7018 with the cooling process using Oil and water
Hardness Analysis of Weld Metal Electrode Low Hydrogen Potassium E7016 and E7018 Syukran Syukran; Azwinur Azwinur; Muhklis Muhklis
Journal of Welding Technology Vol 4, No 2 (2022): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v4i2.3492

Abstract

Electrodes for the Manual Metal Arc (MMA) welding process or welding electrodes are classified based on the type of coating which is informed by the last digit code of the electrode. Electrodes E7016 and E7018 are basic types of electrodes with a Low Hydrogen Potassium coating type which are widely used in welding heavy construction equipment and piping. This electrode has a minimum tensile value of 70 ksi (480 MPa) with a carbon content of 0.07% for E7018 and 0.08% for E7016. The difference in carbon content in the composition of the electrode will determine the hardness value of the resulting weld. In use in the field these two electrodes are often recommended and can even be exchanged according to the assumption that the minimum tensile value is relatively the same between the two electrodes. However, due to the difference in carbon content, it will affect the hardness of the weld (weld metal) after welding. Many studies have been carried out to determine the mechanical properties of the welded joints using these electrodes, but research on the specific mechanical properties of the welds of the two electrodes is very rarely carried out. The test method is carried out by making 2 test specimens each for currents of 80A, 100A, and 120A using E7016 and E7018 electrodes with a diameter of 3.2mm. The material used is SA.36. The hardness test was carried out using the Rockwell-C (HRC) method. The test results show that the hardness value of the basic low hydrogen potassium electrode E7018 has a higher hardness value than E7016 for the same current. At currents of 80A, 100A, and 120A, there was an increase in the hardness of the E7018 weld metal against E7016 by 2.0% each; 9.8%; and 6.7%. The highest hardness value is found at 80A of 42.3HRC for the E7018 electrode, and 41.5 HRC for the E7016 electrode. In E7016 the increase in current causes a decrease in hardness level of 8.2% from 80A to 100A; 12.3% from 100A to 120A. In E7018 the increase in current causes a 1.2% decrease in hardness from 80A to 100A; 14.7% from 100A to 120A

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