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Mechanical and Metallurgical Analysis of HSLA Steel for Gas Tungsten Arc Welding with Different Shielding Gases

CSI College of Engineering-Dhanraj Gurusamy, Prashanth Murthy, Senthilkumar Ramakrishnan, Sivakumar Nanjappan
Sri Krishna College of Engineering and Technology-Soundararajan Ranganathan
  • Technical Paper
  • 2019-28-0069
Published 2019-10-11 by SAE International in United States
The special designed HSLA (High Speed Low Alloy) Steel is most commonly used in Naval Steel Structures and aircraft structures due to its indigenous properties. The aim of this paper is used to investigate the effect of shielding gases in the Gas Tungsten Arc Welding process. DMR 249A [HSLA] plates were welded by GTAW by using helium and argon as shielding gas with a flow rate of 16 L/min, the interpass temperature is 140 degree Celsius and the heat input is less than 1.2KJ/min where the impact toughness, Tensile and micro hardness was studied with different shielding gas and the metallurgical properties were analysed in the base metal, heat affected zones and weld zones. A detailed study has been carried out to analyze the elements using Scanning Electron Microscopy and Energy Dispersive Spectroscopy (EDS) analysis. The properties of the high speed low alloy steel carried out reveals a better mechanical properties suitable in naval applications.
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Investigation on Microstructure and Mechanical Properties of Corrosion Resistance Alloy C-2000 Fabricated by Conventional Arc Welding Technique

Hawassa University-Sivan Rajkumar
KPR Institute of Engg and Technology-Balasubramanian Arulmurugan
  • Technical Paper
  • 2019-28-0177
Published 2019-10-11 by SAE International in United States
In the current work the metallurgical and tensile properties of the weld joints of alloy C-2000 were investigated. Welding technique employed in this study is Tungsten Inert Gas Welding (TIG) and Pulsed Current Tungsten Inert Gas (PC-TIG) welding with autogenous mode and Ni-Cr-Mo rich ERNiCrMo-10 filler wire. The results show that PC-TIG weldment obtained the refined microstructure compared to the TIG weldment. Energy dispersive spectroscopy (EDS) showed the extent of Cr segregation was observed in all the weldments. PC-TIG welding shows reduced segregation compared to the corresponding TIG. X-ray diffraction (XRD) corroborated the existence of Ni3Cr2 phases in the weld fusion zone. Tensile test results show the PC-TIG weldment obtained marginally higher tensile properties comparing over the corresponding TIG weldment. The strength of the weldments is inferior in all cases in comparison to base metal.
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Chemical and Physical Characteristics of Organic Particulate Matter from Exhaust After-Treatment System of Euro 6 Diesel Engine Operating at Full Load

FPT Motorenforschung AG-Wolfgang Gstrein, Konstantinos Priftis
Istituto Motori-CNR-Ezio Mancaruso, Bianca Maria Vaglieco
  • Technical Paper
  • 2019-24-0053
Published 2019-09-09 by SAE International in United States
The current legislation does not take into account the limitation of sub 23 nm particles from engine. Nevertheless, the Common Rail Diesel engine emits a large number of nanoparticle, solid and volatiles, that are very dangerous for human health. In this contest, the challenge of the “dieper EU project” is to apply advanced technologies for exhaust after-treatment to existing diesel engines and to optimize the characteristics of a new generation of engines with regards to emissions, fuel consumption and drivability.Aim of the present paper is to provide useful information for the development of the after-treatment system that will have to fulfill Euro6 further steps. In order to characterize the chemical and physical nature of Particulate Matter emitted from Euro 6b Medium Duty diesel engine, the pollutants were collected and analyzed: from engine-out, downstream of the particulate filter (DPF), and at the exit of a selective catalytic reactor (SCR). An array of chemical, physical and spectroscopic techniques (Gas chromatography coupled with mass spectrometry (GC-MS), mobility analyzer, UV-visible absorption and fluorescence spectroscopy) was applied for characterizing the…
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Detecting Chemical Weapons Using Fourier Transform Infrared Spectroscopy

  • Magazine Article
  • TBMG-35165
Published 2019-09-01 by Tech Briefs Media Group in United States

Chemical Warfare Agents (CWA) are a class of Weapons of Mass Destruction (WMD) designed to kill and injure humans through exposure to extremely toxic chemicals. In addition to CWA many chemicals used by industry, often referred to as Toxic Industrial Chemicals (TICS) can potentially be used by terrorists as weapons.

Matrix-Free Assisted Laser Desorption Ionization Using Metal-Organic Frameworks

  • Magazine Article
  • TBMG-34534
Published 2019-06-01 by Tech Briefs Media Group in United States

Matrix-assisted laser desorption/ionization (MALDI) is a soft ionization technique that is widely applied in the characterization of large biomolecules using various mass spectrometry (MS) analyzers, specifically, time-of-flight (TOF) analyzers. The MALDI process involves the deposition of an analyte solution onto a metal substrate before the addition of a matrix. The matrix/analyte dry spot is exposed to a UV laser, and the laser energy that is absorbed by the matrix/analyte is converted into heat energy that initiates charge transfer, which results in the desorption of the matrix and analyte molecules in ionized form. The positive ions are then accelerated through a vacuum into MS analyses.

Systems and Methods for Correcting Optical Reflectance Measurements

  • Magazine Article
  • TBMG-34625
Published 2019-06-01 by Tech Briefs Media Group in United States

Optical spectroscopy can be used to determine the concentration of chemical species in samples. The amount of light absorbed by a particular chemical species is often linearly related to its concentration through Beer’s Law. For nontransparent materials such as powders, tablets, natural materials (soil), blood, skin, and muscle, optical information can be collected via diffuse reflectance spectroscopy.

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Matrix-Free Assisted Laser Desorption Ionization Using Metal-Organic Frameworks

Aerospace & Defense Technology: June 2019

  • Magazine Article
  • 19AERP06_10
Published 2019-06-01 by SAE International in United States

Army Research, Development and Engineering Command, Aberdeen Proving Ground, Maryland

Matrix-assisted laser desorption/ionization (MALDI) is a soft ionization technique that is widely applied in the characterization of large biomolecules using various mass spectrometry (MS) analyzers, specifically, time-of-flight (TOF) analyzers. The MALDI process involves the deposition of an analyte solution onto a metal substrate before the addition of a matrix. The matrix/analyte dry spot is exposed to a UV laser, and the laser energy that is absorbed by the matrix/analyte is converted into heat energy that initiates charge transfer, which results in the desorption of the matrix and analyte molecules in ionized form. The positive ions are then accelerated through a vacuum into MS analyses.

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CORRIGENDUM: Rapid Methodology to Simultaneous Quantification of Differ Antioxidants in Biodiesel Using Infrared Spectrometry and Multivariate Calibration

SAE International Journal of Fuels and Lubricants

National Institute of Metrology, Quality and Technology (INMETRO), Brazil-Luciano Nascimento Batista, Viviane F. Mello, Mauricio G. Fonseca, Wericksonb F.C. Rocha
National Institute of Technology, Brazil-Claudete N. Kunigami
  • Journal Article
  • 04-12-01-0004.1
Published 2019-05-15 by SAE International in United States
No Abstract Available.
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Radiometric Temperature Measurement Using a DLP-Based Pyrometer

  • Magazine Article
  • TBMG-34389
Published 2019-05-01 by Tech Briefs Media Group in United States

Researchers at NASA’s Armstrong Flight Research Center have identified and evaluated recently available miniature spectrometers that enable compact and robust pyrometry systems capable of measuring aircraft surface temperatures and emissivity during flight.

Measurement Method for Radioactive Methane

  • Magazine Article
  • TBMG-34384
Published 2019-05-01 by Tech Briefs Media Group in United States

Anew method for measuring radioactive methane is an optical one based on spectroscopy. Previously, radioactive methane has been measured with accelerator mass spectrometry involving expensive machines. Optical measuring could be a cheaper and more agile method.