scholarly journals PENGARUH VARIASI ARUS TERHADAP KEKUATAN IMPACT DAN KEKERASAN MATERIAL ST 37 MENGGUNAKAN PROSES PENGELASN GAS TUNGSTEN ARC WELDING (GTAW)

2017 ◽  
Vol 5 (2) ◽  
Author(s):  
Jaeme Martins Kolo ◽  
I Nyoman Pasek Nugraha ◽  
Gede Widayana
Keyword(s):  
Impact Toughness ◽  
Arc Welding ◽  
Welding Process ◽  
Current Gain ◽  
Parent Metal ◽  
Average Value ◽  
Gas Tungsten Arc ◽  
Average Impact ◽  
Current Variation ◽  
A Current

Kekuatan hasil lasan dipengaruhi oleh tegangan busur, besar arus, kecepatan pengelasan, besarnya penembusan dan polaritas listrik. Penelitian ini bertujuan untuk mengetahui tingkat ketangguhan, kekerasan dan pengamatan struktur mikro material ST 37 yang dipengaruhi oleh variasi arus 90 amper, 110 amper dan 130 amper serta penelitian ini dapat memberikan bahan referensi bagi lingkup pendidikan teknik mesin dan sebagai acuan di dunia industri dalam menggunakan variasi arus pada proses pengelasan. Adapun jenis metode yang digunakan dalam penelitian ini adalah metode eksperimen. Adapun jenis variabel yang digunakan yaitu variabel bebas yang berupa variasi arus pengelasan 90 amper, 110 amper dan 130 amper dan variabel terikat berupa sifat mekanik hasil pengelasan. Dari hasil penelitian yang telah dilakukan dimana rata-rata ketangguhan impact pada variasi arus 90 amper memperoleh nilai impact 0,481 J/mm2, rata-rata ketangguhan impact pada variasi arus 110 amper memperoleh nilai impact 0,482 J/mm2 dan rata-rata ketangguhan impact pada variasi arus 130 amper memperoleh nilai impact 0,483 J/mm2. Dari hasil penelitian kekerasan vickers pada daerah logam las dengan variasi arus 90 amper memperoleh nilai rata-rata sebesar 63,98 Kg/mm2, variasi arus 110 amper memperoleh nilai rata-rata sebesar 87,44 Kg/mm2, dan variasi arus 130 amper memperoleh nilai rata-rata sebesar 74,93 Kg/mm2. Kekerasan pada daerah HAZ dengan variasi arus 90 amper memperoleh nila rata-rata sebesar 54,58 Kg/mm2, variasi arus 110 amper memperoleh nilai rata-rata sebesar 80,74 Kg/mm2 dan variasi arus 130 memperoleh nilai rata-rata sebesar 70,61 Kg/mm2. Kekerasan pada daerah logam induk dengan variasi arus 90 amper memperoleh nilai rata-rata sebesar 59,66 Kg/mm2, variasi arus 110 amper memperoleh nilai rata-rata sebesar 89,94 Kg/mm2 dan variasi arus 130 memperoleh nilai rata-rata sebesar 78,91 Kg/mm2. Berdasarkan dari hasil yang telah didapatkan baik pada hasil ketangguhan impact dan kekerasan logam induk, HAZ dan daerah logam las dimana hasil ketangguhan impact yang lebih baik diperoleh dari memvariasikan arus 130 amper di bandingkan dengan variasi arus 90 amper dan variasi arus 110 amper dan tingkat kekerasan yang lebih baik diperoleh dari memvariasikan arus 110 amper dibandingkan dengan variasi arus 90 amper dan variasi arus 130 amper dari proses pengelasan Gas Tungsten Arc Welding (GTAW). Kata Kunci : Kata kunci : variasi arus, ketangguhan impact dan Kekerasan, Material ST 37 The strength of the weld is influenced by the arc voltage, the magnitude of the current, the speed of welding, the magnitude of the penetration and the electrical polarity. This study aims to determine the level of toughness, hardness and observation of microstructure ST 37 material influenced by current variations of 90 amperes, 110 amperes and 130 amperes and this study can provide reference materials for the scope of mechanical engineering education and as a reference in the industrial world in using variations Current in the welding process. The type of method used in this study is the experimental method. The types of variables used are independent variables in the form of welding current variations of 90 amperes, 110 amperes and 130 amperes and the dependent variable in the form of mechanical properties of welding. From the results of the research that has been done where the average impact toughness on the variation of 90 amperes current gain value of 0.481 J/mm2, the average impact toughness on the variation of 110 amperes current gain value of 0.482 J/mm2 and the average impact toughness on variation A current of 130 amperes obtains an impact value of 0.483 J/mm2. From the result of research of vickers hardness on weld metal area with variation of 90 amperes current get average value equal to 63,98 Kg/mm2, variation of 110 amperes current get average value equal to 87,44 Kg/mm2, and variation of current of 130 amperes obtain Average value of 74.93 Kg/mm2. Hardness in the HAZ region with a current variation of 90 amperes obtains an average of 54.58 Kg/mm2, a 110 amperes current variation obtains an average value of 80.74 Kg/mm2 and a current variation of 130 obtains an average value of 70,61 Kg/mm2. Hardness in the parent metal region with a current variation of 90 amperes obtains an average value of 59.66 Kg/mm2, a 110 amperes current variation obtains an average value of 89.94 Kg/mm2 and a current variation of 130 obtains an average value of 78,91 Kg/mm2. Based on the results obtained both on impact toughness and hardness of parent metal, HAZ and weld metal areas where better impact toughness results obtained from varying the current of 130 amperes in comparison with the variation of 90 amperes current and 110 amperes current variation and the level of hardness Preferably obtained from varying the 110 ampere current compared to the current variation of 90 amperes and the current variation of 130 amperes of the Tungsten Arc Welding (GTAW) welding process. keyword : Keywords: current variation, impact toughness and Hardness, Material ST 37

Welding: Particulate and Gaseous Emissions

2019 ◽  
Author(s):  
Cole Homer ◽  
Epstein Seymour ◽  
Peace Jon
Keyword(s):  
Arc Welding ◽  
Gas Metal Arc Welding ◽  
Welding Process ◽  
Pure Metal ◽  
Gaseous Emissions ◽  
Hazard Communication ◽  
Gas Tungsten Arc ◽  
Metal Arc Welding ◽  
Electric Arc Welding ◽  
And Control

Fabrication and repair of aluminum components and structures commonly involves the use of electric arc welding. The interaction of the arc and the metal being welded generates ultraviolet radiation, metallic oxides, fumes, and gases. Aluminum is seldom used as the pure metal but is often alloyed with other metals to improve strength and other physical properties. Therefore, the exact composition of any emissions will depend on the welding process and the particular aluminum alloy being welded. To quantify such emissions, The Aluminum Association sponsored several studies to characterize arc welding emissions by the gas metal arc welding (GMAW) and gas tungsten arc welding (GTAW) processes for various combinations of base and filler alloys. In all cases, the tests were conducted under conditions that could be found in a production weld shop without forced ventilation. The concentrations of each analyte that a welder could be exposed to were greatly affected by the welding process, the composition of the base and filler alloys, the position of the welder, and the welding helmet. The results obtained can be used by employers to identify and control potential hazards associated with the welding of aluminum alloys and can provide the basis for hazard communication to employees involved in the welding of these alloys.

scholarly journals Pengaruh Variasi Arus pada Pengelasan Baja ST37 Menggunakan Las Shield Metal Arc Welding (SMAW) dengan Posisi Pengelasan 3F

Syntax Idea ◽  
2021 ◽  
Vol 3 (8) ◽  
pp. 1967
Author(s):  
Oktovalen Ferenza ◽  
Tuparjono Tuparjono ◽  
Sugiyarto Sugiyarto
Keyword(s):  
Arc Welding ◽  
Arc Length ◽  
Shielded Metal Arc Welding ◽  
Metal Arc Welding ◽  
Weld Defect ◽  
Current Variation ◽  
Welding Defects ◽  
Fillet Joint ◽  
Welding Position ◽  
A Current

Welding is a very important part in the development and growth of the industry because it has a role in engineering, repair and construction. Shielded metal arc welding (SMAW) is the process of joining two or more materials using a wrapped electrode as heat energy to melt the material. The purpose of this study was to determine the effect and welding defects that arise with current variations so that the optimal welding results obtained from 3 amperes were tested using E6013 electrode diameter 3,2 at the 3F welding position fillet joint. This study uses an experimental method with the material used is St 37 steel with a current variation of 90A, 100A, and 110A. From the research conducted, it was not found optimal welding results where from each ampere tested there was still a weld defect. The defects that occur in the three amperes are caused by the arc, electrode angle, and arc length that exceed the normal limit and are also influenced by the welding speed. From the three variations of the amperage used, the dominant welding results did not occur, namely the 90 amperage, while the 100 amperage welding leg showed good results.

The Effect of Sub-Zero Treatment on Mechanical Properties of GTAW Welded AA6082

2016 ◽  
Vol 852 ◽  
pp. 349-354 ◽  
Author(s):  
R. Devanathan ◽  
Sanjivi Arul ◽  
T. Venkatamuni ◽  
D. Yuvarajan ◽  
D. Christopher Selvam
Keyword(s):  
Mechanical Properties ◽  
Arc Welding ◽  
Artificial Aging ◽  
Cryogenic Treatment ◽  
Welding Process ◽  
Travel Speed ◽  
Treatment Result ◽  
Gas Tungsten Arc ◽  
Shallow Cryogenic Treatment ◽  
Hardness Values

The consequence of sub-zero treatment on the mechanical properties of welded AA6082-T6 by Gas Tungsten Arc Welding (GTAW) which in turn softens the heat concentrated welded region owing to dissolution of the strengthening precipitates. The sub-zero i.e. Shallow Cryogenic Treatment (SCT) is carried out on GTAW welded plate having a thickness of 6 mm at -77°C by varying the electrode travel speed and sub-zero treatment periods. Welded region of AA6082 were tested for hardness and microstructure by adapting three different conditions such as welded, post weld artificial aging with and without sub-zero treatment. Result revealed that the amount of softening in the welded region is indirectly proportional to electrode travel speed during welding process. It is also observed that the post weld SCT with artificial aging has increased the micro hardness values on the welded region as a consequence of the reactivation in the sequence of precipitation.

A study on sustainability assessment of welding processes

2019 ◽  
Vol 234 (3) ◽  
pp. 501-512 ◽  
Author(s):  
Jaber Jamal ◽  
Basil Darras ◽  
Hossam Kishawy
Keyword(s):  
Arc Welding ◽  
Social Impact ◽  
Sustainability Assessment ◽  
Gas Metal Arc Welding ◽  
Welding Process ◽  
Friction Stir ◽  
Gas Tungsten Arc ◽  
Metal Arc Welding ◽  
Sustainability Assessments ◽  
Welding Processes

The concept of “sustainability” has recently risen to take the old concept of going “green” further. This article presents general methodologies for sustainability assessments. These were then adapted to measure and assess the sustainability of welding processes through building a complete framework, to determine the best welding process for a particular application. To apply this methodology, data about the welding processes would be collected and segregated into four categories: environmental impact, economic impact, social impact, and physical performance. The performance of each category would then be aggregated into a single sustainability score. To demonstrate the capability of this methodology, case studies of three different welding processes were performed. Friction stir welding obtained the highest overall sustainability score compared to gas tungsten arc welding and gas metal arc welding.

A Neural Network Model for Predicting Two Observable Parameters of the Welded Cross Section in Case of Robotic Gas Tungsten Arc Welding Process

2012 ◽  
Vol 162 ◽  
pp. 531-536
Author(s):  
Gabriel Gorghiu ◽  
Paul Ciprian Patic ◽  
Dorin Cârstoiu
Keyword(s):  
Neural Network ◽  
Arc Welding ◽  
Welding Process ◽  
Gas Tungsten Arc Welding ◽  
Gas Tungsten Arc ◽  
Proposed Model ◽  
Input Layer ◽  
Gas Tungsten ◽  
Arc Welding Process ◽  
Observable Parameter

The paper presents a model of using the artificial neural networks when determining the relations of dependency between the observable parameters and the controllable ones in the case of RoboticGas Tungsten Arc Welding. The proposed model is based on the direct observation of welded joints, emphasizing on the process variables which have been arranged in the nodes of a neural network. The design of the network intended to achieve an architecture that contains four nodes in the input layer (all of them being controllable parameters) and two nodes in the output layer (one for each observable parameter).

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