The Experts below are selected from a list of 50778 Experts worldwide ranked by ideXlab platform
Chunli Yang - One of the best experts on this subject based on the ideXlab platform.
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process stability of Ultrasonic Wave assisted gas metal arc welding
Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science, 2017Co-Authors: Chunli YangAbstract:As a newly developed arc welding method, Ultrasonic-Wave-assisted arc welding successfully introduced power ultrasound into the arc and weld pool, during which the Ultrasonic acts on the top of the arc in the coaxial alignment direction. The advanced process for molten metals can be realized by using an additional Ultrasonic field. Compared with the conventional gas metal arc welding (GMAW), the welding arc is compressed, the droplet size is decreased, and the droplet transfer frequency is increased significantly in Ultrasonic-Wave-assisted GMAW (U-GMAW). However, the stability of the metal transfer has deep influence on the welding quality equally, and the Ultrasonic Wave effect on the stability of the metal transfer is a phenomenon that is not completely understood. In this article, the stabilities of the short-circuiting transfer process and globular transfer process are studied systematically, and the effect of Ultrasonic Wave on the metal transfer is analyzed further. The transfer frequency and process stability of the U-GMAW process are much higher than those of the conventional GMAW. Analytical results show that the additional Ultrasonic Wave is helpful for improving welding stability.
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effect of acoustic field parameters on arc acoustic binding during Ultrasonic Wave assisted arc welding
Ultrasonics Sonochemistry, 2016Co-Authors: Chunli YangAbstract:As a newly developed arc welding method, power ultrasound has been successfully introduced into arc and weld pool during Ultrasonic Wave-assisted arc welding process. The advanced process for molten metals can be realized by utilizing additional Ultrasonic field. Under the action of the acoustic Wave, the plasma arc as weld heat source is regulated and its characteristics make an obvious change. Compared with the conventional arc, the Ultrasonic Wave-assisted arc plasma is bound significantly and becomes brighter. To reveal the dependence of the acoustic binding force on acoustic field parameters, a two-dimensional acoustic field model for Ultrasonic Wave-assisted arc welding device is established. The influences of the radiator height, the central pore radius, the radiator radius, and curvature radius or depth of concave radiator surface are discussed using the boundary element method. Then the authors analyze the resonant mode by this relationship curve between acoustic radiation power and radiator height. Furthermore, the best acoustic binding ability is obtained by optimizing the geometric parameters of acoustic radiator. In addition, three concave radiator surfaces including spherical cap surface, paraboloid of revolution, and rotating single curved surface are investigated systematically. Finally, both the calculation and experiment suggest that, to obtain the best acoustic binding ability, the Ultrasonic Wave-assisted arc welding setup should be operated under the first resonant mode using a radiator with a spherical cap surface, a small central pore, a large section radius and an appropriate curvature radius.
Richard E. Partch - One of the best experts on this subject based on the ideXlab platform.
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Surface modification of silica particles with polyimide by Ultrasonic Wave irradiation
Advanced Powder Technology, 2005Co-Authors: Yoshikazu Nishida, Hiroaki Takahashi, Mamoru Iso, Masakuni Matsuoka, Richard E. PartchAbstract:Spherical silica particles were dispersed in a polyamic acid varnish (PAAV) solution, and Ultrasonic Wave irradiation resulted in high-speed condensation of conversion to polyimide and in coating of the silica particles. The imidization reaction was verified by Fourier transform IR analysis, thermogravimetry, gel-permeation chromatography and moisture analysis. In addition, the particle coating was observed by transmission electron microscopy. Adsorption of polyimide acid onto the surface of the silica particles while achieving an imidization reaction by Ultrasonic Wave irradiation has been clearly shown to enhance the rate of the imidization reaction.
Thomas Seldis - One of the best experts on this subject based on the ideXlab platform.
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Enhanced experimental approach to measure the absolute Ultrasonic Wave attenuation.
Ultrasonics, 2009Co-Authors: Thomas SeldisAbstract:The absolute Ultrasonic Wave attenuation is an important input parameter for mathematical models, which play an increasingly important role in non-destructive testing. The measurement of the absolute Ultrasonic Wave attenuation however is a difficult task. When conventional measurement techniques are applied, corrections to the raw data are required to account for apparent losses. In this study, a modified experimental approach is proposed to determine the absolute Ultrasonic attenuation without any further corrections of the raw data.
Hiroshi Yamada - One of the best experts on this subject based on the ideXlab platform.
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Ultrasonic Wave induced mechanoluminescence and its application for photocatalysis as ubiquitous light source
Catalysis Today, 2013Co-Authors: Nao Terasaki, Hiroshi YamadaAbstract:For the purpose of mechanoluminescent (ML) ubiquitous light source, we focus on Ultrasonic Wave as non-destructive and non-invasive stimulation for bio-tissue. Actually we have investigated Ultrasonic Wave induced mechanoluminescence (USML) and successfully detected the mechanoluminescence response accompanied by the Ultrasonic Wave irradiation. The USML intensity depends on kinds of ML material, input intensity of Ultrasonic Wave and so on. The USML properties, such as sustainability, temperature dependence and input mechanical load dependence, were same as the ML properties shown in conventional ML test by using universal testing machine so far. Furthermore, though it was in primitive stage, we successfully detected degradation of methylene blue dye accompanied by US irradiation to mixture solution with visible light responding TiO2 photocatalyst and europium doped strontium aluminate (SAOE), and demonstrated the USML acted as the light source for a photo-activation of TiO2 photocatalyst for the first time.
Yoshikazu Nishida - One of the best experts on this subject based on the ideXlab platform.
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Surface modification of silica particles with polyimide by Ultrasonic Wave irradiation
Advanced Powder Technology, 2005Co-Authors: Yoshikazu Nishida, Hiroaki Takahashi, Mamoru Iso, Masakuni Matsuoka, Richard E. PartchAbstract:Spherical silica particles were dispersed in a polyamic acid varnish (PAAV) solution, and Ultrasonic Wave irradiation resulted in high-speed condensation of conversion to polyimide and in coating of the silica particles. The imidization reaction was verified by Fourier transform IR analysis, thermogravimetry, gel-permeation chromatography and moisture analysis. In addition, the particle coating was observed by transmission electron microscopy. Adsorption of polyimide acid onto the surface of the silica particles while achieving an imidization reaction by Ultrasonic Wave irradiation has been clearly shown to enhance the rate of the imidization reaction.
