Journal ArticleDOI
Spectroscopic analysis of the plasma continuum radiation for on-line arc-welding defect detection
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TLDR
In this paper, the wavelength associated with the maximum intensity of the plasma background emission is proposed as the new monitoring signal, as it will be demonstrated that there is a clear correlation between this parameter and the welding quality.Abstract:
When plasma optical spectroscopy is applied to on-line welding quality monitoring, the plasma electronic temperature is commonly selected as the spectroscopic parameter to determine. However, several processing stages have to be considered in this case, including plasma emission line identification, which is significantly costly in terms of computational performance. In this paper, the wavelength associated with the maximum intensity of the plasma background emission is proposed as the new monitoring signal, as it will be demonstrated that there is a clear correlation between this parameter and the welding quality. The resulting processing scheme is clearly simpler, and experimental and field tests will prove the feasibility of the proposed technique.read more
Citations
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Journal ArticleDOI
Real-time monitoring of laser welding of galvanized high strength steel in lap joint configuration
TL;DR: In this article, the influence of zinc vapor on the keyhole dynamics of the weld pool and the final welding quality was studied for galvanized high strength DP980 steel in a lap-joint configuration.
Journal ArticleDOI
Characteristics of plasma plume in fiber laser welding of aluminum alloy
TL;DR: In this article, the effects of laser power on the characteristics of fiber laser induced plasma plume were studied by emission spectroscopic analysis firstly, and the results indicated that the plasma shielding effect is dominated by inverse bremsstrahlung linear absorption coefficient.
Journal ArticleDOI
Defect Detection in Arc-Welding Processes by Means of the Line-to-Continuum Method and Feature Selection
P. Beatriz Garcia-Allende,Jesus Mirapeix,Olga M. Conde,Adolfo Cobo,Jose Miguel Lopez-Higuera +4 more
TL;DR: A feature selection methodology is proposed to solve the uncertainty regarding the selection of the optimum spectral band, which allows the employment of the line-to-continuum method for on-line welding diagnostics.
Journal ArticleDOI
Thermal Science of Weld Bead Defects: A Review
TL;DR: In this paper, the effects of working parameters and properties on humping and rippling, for example, can be systematically and quantitatively interpreted from scale analysis presented in this paper.
Journal ArticleDOI
A novel method to determine the electron temperature and density from the absolute intensity of line and continuum emission: application to atmospheric microwave induced Ar plasmas
EI Ekaterina Iordanova,JM Jose Palomares,Antonio Gamero,Antonio Sola,van der Jjam Joost Mullen +4 more
TL;DR: In this article, an iterative combination of the absolute line intensity-collisional radiative model (ALI-CRM) and the absolute continuum intensity (ACI) method is presented that combines the absolute measurements of the line and the continuum emitted by argon plasmas.
References
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Book
Principles of Plasma Spectroscopy
TL;DR: The diagnosis of plasmas using spectroscopic observations has its origins in various older disciplines, including astronomy and discharge physics as mentioned in this paper, and the need for non-interfering diagnostics arose and spectroscopy was applied to determine the physical state and chemical abundance of the studied.
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Validity of Local Thermal Equilibrium in Plasma Spectroscopy
TL;DR: In this article, the existence of local thermal equilibrium in various classes of plasmas is derived. But the influence of the imprisonment of resonance radiation on the establishment of thermal equilibrium is considered, and even then complete thermal equilibrium can usually not be achieved for multiply ionized species.
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Real-time arc-welding defect detection and classification with principal component analysis and artificial neural networks
TL;DR: In this article, a new approach that allows automatic weld defect detection and classification based in the combined use of principal component analysis (PCA) and an artificial neural network (ANN) is proposed.
Journal ArticleDOI
The calculation of electron density and temperature in Ar spectroscopic plasmas from continuum and line spectra
TL;DR: In this article, the measurement of electron temperature and electron density from line and continuum radiation in Ar plasmas used for spectroscopic purposes is discussed and the correct equations for the calculation of these parameters from experimentally observable quantities are identified.