scholarly journals Numerical Study of Welding Process by Arc Plasma at Atmospheric Pressure

2003 ◽  
Vol 2003.11 (0) ◽  
pp. 23-24
Author(s):  
Manabu TANAKA ◽  
Masao USHIO ◽  
John J. LOWKE
Keyword(s):  
Atmospheric Pressure ◽  
Numerical Study ◽  
Welding Process ◽  
Arc Plasma

Synthesis of ultrafine silicon carbide nanoparticles using non‐thermal arc plasma at atmospheric pressure

2021 ◽  
Author(s):  
Cheng Wang ◽  
Jiawen Zhou ◽  
Ming Song ◽  
Zhongshan Lu ◽  
Xianhui Chen ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Atmospheric Pressure ◽  
Arc Plasma ◽  
Silicon Carbide Nanoparticles

Predictions of Current Attachment at Thermionic Cathode for TIG Arcs

2008 ◽  
Vol 580-582 ◽  
pp. 319-322 ◽  
Author(s):  
Manabu Tanaka ◽  
Kentaro Yamamoto ◽  
Tashiro Shinichi ◽  
John J. Lowke
Keyword(s):  
Melting Point ◽  
Work Function ◽  
Atmospheric Pressure ◽  
The Other ◽  
Numerical Calculations ◽  
Maximum Temperature ◽  
Arc Plasma ◽  
Melting Points ◽  
Thermionic Cathode ◽  
Uniform Current

Study of current attachment at thermionic cathode for TIG arc at atmospheric pressure is attempted from numerical calculations of arc-electrodes unified model. The calculations show that the maximum temperature of arc plasma close to the cathode tip for W-2% ThO2 reaches 19,000 K and it is the highest value in comparison with the other temperatures for W-2% La2O3 and W-2% CeO2, because the current attachment at the cathode tip is constricted by a centralized limitation of liquid area of ThO2 due to its higher melting point. The calculations also show that, in cases of W- 2% La2O3 and W-2% CeO2, the liquid areas of La2O3 and Ce2O3 are widely expanded at the cathode tip due to their lower melting points and then produce uniform current attachments at the cathode. It is concluded that the current attachment at thermionic cathode is strongly dependent on work function, melting point and Richardson constant of emitter materials.

Two-dimensional numerical study of two counter-propagating helium plasma jets in air at atmospheric pressure

2014 ◽  
Vol 21 (6) ◽  
pp. 063505 ◽  
Author(s):  
Wen Yan ◽  
Fucheng Liu ◽  
Chaofeng Sang ◽  
Dezhen Wang
Keyword(s):  
Atmospheric Pressure ◽  
Numerical Study ◽  
Plasma Jets ◽  
Helium Plasma ◽  
Two Dimensional

Electrical and spectral property of cold arc plasma at atmospheric pressure

2012 ◽  
Vol 78 (6) ◽  
pp. 617-620
Author(s):  
YUAN ZHONG-CAI ◽  
SHI JIA-MING ◽  
CHEN ZONG-SHENG ◽  
XU BO
Keyword(s):  
Atmospheric Pressure ◽  
Arc Discharge ◽  
Rotational Temperature ◽  
Molecular Nitrogen ◽  
Atmospheric Pressure Plasma ◽  
Emission Spectra ◽  
Optical Emission ◽  
Plasma Jet ◽  
Ambient Air ◽  
Arc Plasma

AbstractAn atmospheric pressure plasma jet is generated with a cold arc discharge in ambient air. The current-voltage characteristics and optical emission spectra of plasma discharges are investigated. The molecular nitrogen (N2), hydroxyl radical (OH), and oxygen atom (O) are observed and analyzed. Based on the best fit of the simulated spectra of N2 (C3∏u+ − B3∏g+) band and OH (A2∑+ − X2∏) band transition and the experimentally recorded spectra, the rotational temperature and the vibrational temperature of atmospheric pressure cold arc plasma jet (APCAPJ) are estimated.

Spot and diffuse mode of cathode attachments in a magnetically rotating arc plasma generator at atmospheric pressure

2019 ◽  
Vol 125 (3) ◽  
pp. 033301 ◽  
Author(s):  
Cheng Wang ◽  
Qiang Sun ◽  
Lu Sun ◽  
Zhongshan Lu ◽  
Weiluo Xia ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Plasma Generator ◽  
Arc Plasma ◽  
Diffuse Mode ◽  
Rotating Arc

Numerical Study of the Tool Rake Angle Effect on the Material Flow in Friction Stir Welding Process

2007 ◽  
Author(s):  
Hosein Atharifar ◽  
Radovan Kovacevic
Keyword(s):  
Friction Stir Welding ◽  
Material Flow ◽  
Numerical Study ◽  
Welding Process ◽  
Rake Angle ◽  
Heat Transfer Analysis ◽  
Tool Geometry ◽  
Friction Stir ◽  
Tool Pin ◽  
Welding Processes

Minimizing consumed energy in friction stir welding (FSW) is one of the prominent considerations in the process development. Modifications of the FSW tool geometry might be categorized as the initial attempt to achieve a minimum FSW effort. Advanced tool pin and shoulder features as well as a low-conductive backing plate, high-conductive FSW tools equipped with cooling fins, and single or multi-step welding processes are all carried out to achieve a flawless weld with reduced welding effort. The outcomes of these attempts are considerable, primarily when the tool pin traditional designs are replaced with threaded, Trifiute or Trivex geometries. Nevertheless, the problem remains as to how an inclined tool affects the material flow characteristics and the loads applied to the tool. It is experimentally proven that a positive rake angle facilitates the traverse motion of the FSW tool; however, few computational evidences were provided. In this study, numerical material flow and heat transfer analysis are carried out for the presumed tool rake angle ranging from −4° to 4°. Afterwards, the effects of the tool rake angle to the dynamic pressure distribution, strain-rates, and velocity profiles are numerically computed. Furthermore, coefficients of drag, lift, and side force and moment applied to the tool from the visco-plastic material region are computed for each of the tool rake angles. Eventually, this paper confirms that the rake angle dramatically affects the magnitude of the loads applied to the FSW tool, and the developed advanced numerical model might be used to find optimum tool rake angle for other aluminum alloys.

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